1034 lines
71 KiB
HTML
Executable File
1034 lines
71 KiB
HTML
Executable File
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<!DOCTYPE html>
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<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]-->
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<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]-->
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Database Forge Class — CodeIgniter 3.1.11 documentation</title>
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<link rel="shortcut icon" href="../_static/ci-icon.ico"/>
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<link href='https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic|Roboto+Slab:400,700|Inconsolata:400,700&subset=latin,cyrillic' rel='stylesheet' type='text/css'>
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<link rel="stylesheet" href="../_static/css/citheme.css" type="text/css" />
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<link rel="index" title="Index"
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href="../genindex.html"/>
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<link rel="search" title="Search" href="../search.html"/>
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<link rel="top" title="CodeIgniter 3.1.11 documentation" href="../index.html"/>
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<link rel="up" title="Database Reference" href="index.html"/>
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<link rel="next" title="Database Utility Class" href="utilities.html"/>
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<link rel="prev" title="Database Caching Class" href="caching.html"/>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/modernizr/2.6.2/modernizr.min.js"></script>
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</head>
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<body class="wy-body-for-nav" role="document">
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<div id="nav">
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<div id="nav_inner">
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<div id="pulldown-menu" class="ciNav">
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../general/welcome.html">Welcome to CodeIgniter</a></li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../installation/index.html">Installation Instructions</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../installation/downloads.html">Downloading CodeIgniter</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../installation/index.html">Installation Instructions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../installation/upgrading.html">Upgrading From a Previous Version</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../installation/troubleshooting.html">Troubleshooting</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../overview/index.html">CodeIgniter Overview</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../overview/getting_started.html">Getting Started</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../overview/at_a_glance.html">CodeIgniter at a Glance</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../overview/features.html">Supported Features</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../overview/appflow.html">Application Flow Chart</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../overview/mvc.html">Model-View-Controller</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../overview/goals.html">Architectural Goals</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../tutorial/index.html">Tutorial</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../tutorial/static_pages.html">Static pages</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../tutorial/news_section.html">News section</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../tutorial/create_news_items.html">Create news items</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../tutorial/conclusion.html">Conclusion</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../contributing/index.html">Contributing to CodeIgniter</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../documentation/index.html">Writing CodeIgniter Documentation</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../DCO.html">Developer’s Certificate of Origin 1.1</a></li>
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</ul>
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</li>
|
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</ul>
|
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../general/index.html">General Topics</a><ul>
|
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<li class="toctree-l2"><a class="reference internal" href="../general/urls.html">CodeIgniter URLs</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="../general/controllers.html">Controllers</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="../general/reserved_names.html">Reserved Names</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/views.html">Views</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/models.html">Models</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/helpers.html">Helpers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/libraries.html">Using CodeIgniter Libraries</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/creating_libraries.html">Creating Libraries</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/drivers.html">Using CodeIgniter Drivers</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="../general/creating_drivers.html">Creating Drivers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/core_classes.html">Creating Core System Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/ancillary_classes.html">Creating Ancillary Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/hooks.html">Hooks - Extending the Framework Core</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/autoloader.html">Auto-loading Resources</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/common_functions.html">Common Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/compatibility_functions.html">Compatibility Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/routing.html">URI Routing</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/errors.html">Error Handling</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/caching.html">Caching</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/profiling.html">Profiling Your Application</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/cli.html">Running via the CLI</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/managing_apps.html">Managing your Applications</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/environments.html">Handling Multiple Environments</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/alternative_php.html">Alternate PHP Syntax for View Files</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/security.html">Security</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/styleguide.html">PHP Style Guide</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../libraries/index.html">Libraries</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/benchmark.html">Benchmarking Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/caching.html">Caching Driver</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/calendar.html">Calendaring Class</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../libraries/cart.html">Shopping Cart Class</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../libraries/config.html">Config Class</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../libraries/email.html">Email Class</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../libraries/encrypt.html">Encrypt Class</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="../libraries/encryption.html">Encryption Library</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="../libraries/file_uploading.html">File Uploading Class</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../libraries/form_validation.html">Form Validation</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../libraries/ftp.html">FTP Class</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="../libraries/image_lib.html">Image Manipulation Class</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="../libraries/input.html">Input Class</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../libraries/javascript.html">Javascript Class</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="../libraries/language.html">Language Class</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../libraries/loader.html">Loader Class</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="../libraries/migration.html">Migrations Class</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="../libraries/output.html">Output Class</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="../libraries/pagination.html">Pagination Class</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../libraries/parser.html">Template Parser Class</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../libraries/security.html">Security Class</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="../libraries/sessions.html">Session Library</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="../libraries/table.html">HTML Table Class</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="../libraries/trackback.html">Trackback Class</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="../libraries/typography.html">Typography Class</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="../libraries/unit_testing.html">Unit Testing Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/uri.html">URI Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/user_agent.html">User Agent Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/zip.html">Zip Encoding Class</a></li>
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</ul>
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</li>
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</ul>
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<ul class="current">
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<li class="toctree-l1 current"><a class="reference internal" href="index.html">Database Reference</a><ul class="current">
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<li class="toctree-l2"><a class="reference internal" href="examples.html">Quick Start: Usage Examples</a></li>
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<li class="toctree-l2"><a class="reference internal" href="configuration.html">Database Configuration</a></li>
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<li class="toctree-l2"><a class="reference internal" href="connecting.html">Connecting to a Database</a></li>
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<li class="toctree-l2"><a class="reference internal" href="queries.html">Running Queries</a></li>
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<li class="toctree-l2"><a class="reference internal" href="results.html">Generating Query Results</a></li>
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<li class="toctree-l2"><a class="reference internal" href="helpers.html">Query Helper Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="query_builder.html">Query Builder Class</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="transactions.html">Transactions</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="metadata.html">Getting MetaData</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="call_function.html">Custom Function Calls</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="caching.html">Query Caching</a></li>
|
||
<li class="toctree-l2 current"><a class="current reference internal" href="#">Database Manipulation with Database Forge</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="utilities.html">Database Utilities Class</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="db_driver_reference.html">Database Driver Reference</a></li>
|
||
</ul>
|
||
</li>
|
||
</ul>
|
||
<ul>
|
||
<li class="toctree-l1"><a class="reference internal" href="../helpers/index.html">Helpers</a><ul>
|
||
<li class="toctree-l2"><a class="reference internal" href="../helpers/array_helper.html">Array Helper</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../helpers/captcha_helper.html">CAPTCHA Helper</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../helpers/cookie_helper.html">Cookie Helper</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../helpers/directory_helper.html">Directory Helper</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../helpers/download_helper.html">Download Helper</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../helpers/email_helper.html">Email Helper</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../helpers/file_helper.html">File Helper</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../helpers/form_helper.html">Form Helper</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../helpers/html_helper.html">HTML Helper</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../helpers/inflector_helper.html">Inflector Helper</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../helpers/language_helper.html">Language Helper</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../helpers/number_helper.html">Number Helper</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../helpers/path_helper.html">Path Helper</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../helpers/security_helper.html">Security Helper</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../helpers/smiley_helper.html">Smiley Helper</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../helpers/string_helper.html">String Helper</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../helpers/text_helper.html">Text Helper</a></li>
|
||
<li class="toctree-l2"><a class="reference internal" href="../helpers/typography_helper.html">Typography Helper</a></li>
|
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<li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li>
|
||
</ul>
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||
</li>
|
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</ul>
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</div>
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</div>
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</div>
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<div id="nav2">
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<a href="#" id="openToc">
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<img src="data:image/jpeg;base64,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" title="Toggle Table of Contents" alt="Toggle Table of Contents" />
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<div class="section" id="database-forge-class">
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<h1><a class="toc-backref" href="#id1">Database Forge Class</a><a class="headerlink" href="#database-forge-class" title="Permalink to this headline">¶</a></h1>
|
||
<p>The Database Forge Class contains methods that help you manage your
|
||
database.</p>
|
||
<div class="contents topic" id="table-of-contents">
|
||
<p class="topic-title first">Table of Contents</p>
|
||
<ul class="simple">
|
||
<li><a class="reference internal" href="#database-forge-class" id="id1">Database Forge Class</a><ul>
|
||
<li><a class="reference internal" href="#initializing-the-forge-class" id="id2">Initializing the Forge Class</a></li>
|
||
<li><a class="reference internal" href="#creating-and-dropping-databases" id="id3">Creating and Dropping Databases</a></li>
|
||
<li><a class="reference internal" href="#creating-and-dropping-tables" id="id4">Creating and Dropping Tables</a><ul>
|
||
<li><a class="reference internal" href="#adding-fields" id="id5">Adding fields</a></li>
|
||
<li><a class="reference internal" href="#adding-keys" id="id6">Adding Keys</a></li>
|
||
<li><a class="reference internal" href="#creating-a-table" id="id7">Creating a table</a></li>
|
||
<li><a class="reference internal" href="#dropping-a-table" id="id8">Dropping a table</a></li>
|
||
<li><a class="reference internal" href="#renaming-a-table" id="id9">Renaming a table</a></li>
|
||
</ul>
|
||
</li>
|
||
<li><a class="reference internal" href="#modifying-tables" id="id10">Modifying Tables</a><ul>
|
||
<li><a class="reference internal" href="#adding-a-column-to-a-table" id="id11">Adding a Column to a Table</a></li>
|
||
<li><a class="reference internal" href="#dropping-a-column-from-a-table" id="id12">Dropping a Column From a Table</a></li>
|
||
<li><a class="reference internal" href="#modifying-a-column-in-a-table" id="id13">Modifying a Column in a Table</a></li>
|
||
</ul>
|
||
</li>
|
||
<li><a class="reference internal" href="#class-reference" id="id14">Class Reference</a></li>
|
||
</ul>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="section" id="initializing-the-forge-class">
|
||
<h2><a class="toc-backref" href="#id2">Initializing the Forge Class</a><a class="headerlink" href="#initializing-the-forge-class" title="Permalink to this headline">¶</a></h2>
|
||
<div class="admonition important">
|
||
<p class="first admonition-title">Important</p>
|
||
<p class="last">In order to initialize the Forge class, your database
|
||
driver must already be running, since the forge class relies on it.</p>
|
||
</div>
|
||
<p>Load the Forge Class as follows:</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">dbforge</span><span class="p">()</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>You can also pass another database object to the DB Forge loader, in case
|
||
the database you want to manage isn’t the default one:</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">myforge</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">dbforge</span><span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">other_db</span><span class="p">,</span> <span class="k">TRUE</span><span class="p">);</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>In the above example, we’re passing a custom database object as the first
|
||
parameter and then tell it to return the dbforge object, instead of
|
||
assigning it directly to <code class="docutils literal"><span class="pre">$this->dbforge</span></code>.</p>
|
||
<div class="admonition note">
|
||
<p class="first admonition-title">Note</p>
|
||
<p class="last">Both of the parameters can be used individually, just pass an empty
|
||
value as the first one if you wish to skip it.</p>
|
||
</div>
|
||
<p>Once initialized you will access the methods using the <code class="docutils literal"><span class="pre">$this->dbforge</span></code>
|
||
object:</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">some_method</span><span class="p">();</span>
|
||
</pre></div>
|
||
</div>
|
||
</div>
|
||
<div class="section" id="creating-and-dropping-databases">
|
||
<h2><a class="toc-backref" href="#id3">Creating and Dropping Databases</a><a class="headerlink" href="#creating-and-dropping-databases" title="Permalink to this headline">¶</a></h2>
|
||
<p><strong>$this->dbforge->create_database(‘db_name’)</strong></p>
|
||
<p>Permits you to create the database specified in the first parameter.
|
||
Returns TRUE/FALSE based on success or failure:</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">create_database</span><span class="p">(</span><span class="s1">'my_db'</span><span class="p">))</span>
|
||
<span class="p">{</span>
|
||
<span class="k">echo</span> <span class="s1">'Database created!'</span><span class="p">;</span>
|
||
<span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
||
<p><strong>$this->dbforge->drop_database(‘db_name’)</strong></p>
|
||
<p>Permits you to drop the database specified in the first parameter.
|
||
Returns TRUE/FALSE based on success or failure:</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">drop_database</span><span class="p">(</span><span class="s1">'my_db'</span><span class="p">))</span>
|
||
<span class="p">{</span>
|
||
<span class="k">echo</span> <span class="s1">'Database deleted!'</span><span class="p">;</span>
|
||
<span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
||
</div>
|
||
<div class="section" id="creating-and-dropping-tables">
|
||
<h2><a class="toc-backref" href="#id4">Creating and Dropping Tables</a><a class="headerlink" href="#creating-and-dropping-tables" title="Permalink to this headline">¶</a></h2>
|
||
<p>There are several things you may wish to do when creating tables. Add
|
||
fields, add keys to the table, alter columns. CodeIgniter provides a
|
||
mechanism for this.</p>
|
||
<div class="section" id="adding-fields">
|
||
<h3><a class="toc-backref" href="#id5">Adding fields</a><a class="headerlink" href="#adding-fields" title="Permalink to this headline">¶</a></h3>
|
||
<p>Fields are created via an associative array. Within the array you must
|
||
include a ‘type’ key that relates to the datatype of the field. For
|
||
example, INT, VARCHAR, TEXT, etc. Many datatypes (for example VARCHAR)
|
||
also require a ‘constraint’ key.</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$fields</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
|
||
<span class="s1">'users'</span> <span class="o">=></span> <span class="k">array</span><span class="p">(</span>
|
||
<span class="s1">'type'</span> <span class="o">=></span> <span class="s1">'VARCHAR'</span><span class="p">,</span>
|
||
<span class="s1">'constraint'</span> <span class="o">=></span> <span class="s1">'100'</span><span class="p">,</span>
|
||
<span class="p">),</span>
|
||
<span class="p">);</span>
|
||
<span class="c1">// will translate to "users VARCHAR(100)" when the field is added.</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>Additionally, the following key/values can be used:</p>
|
||
<ul class="simple">
|
||
<li>unsigned/true : to generate “UNSIGNED” in the field definition.</li>
|
||
<li>default/value : to generate a default value in the field definition.</li>
|
||
<li>null/true : to generate “NULL” in the field definition. Without this,
|
||
the field will default to “NOT NULL”.</li>
|
||
<li>auto_increment/true : generates an auto_increment flag on the
|
||
field. Note that the field type must be a type that supports this,
|
||
such as integer.</li>
|
||
<li>unique/true : to generate a unique key for the field definition.</li>
|
||
</ul>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$fields</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
|
||
<span class="s1">'blog_id'</span> <span class="o">=></span> <span class="k">array</span><span class="p">(</span>
|
||
<span class="s1">'type'</span> <span class="o">=></span> <span class="s1">'INT'</span><span class="p">,</span>
|
||
<span class="s1">'constraint'</span> <span class="o">=></span> <span class="mi">5</span><span class="p">,</span>
|
||
<span class="s1">'unsigned'</span> <span class="o">=></span> <span class="k">TRUE</span><span class="p">,</span>
|
||
<span class="s1">'auto_increment'</span> <span class="o">=></span> <span class="k">TRUE</span>
|
||
<span class="p">),</span>
|
||
<span class="s1">'blog_title'</span> <span class="o">=></span> <span class="k">array</span><span class="p">(</span>
|
||
<span class="s1">'type'</span> <span class="o">=></span> <span class="s1">'VARCHAR'</span><span class="p">,</span>
|
||
<span class="s1">'constraint'</span> <span class="o">=></span> <span class="s1">'100'</span><span class="p">,</span>
|
||
<span class="s1">'unique'</span> <span class="o">=></span> <span class="k">TRUE</span><span class="p">,</span>
|
||
<span class="p">),</span>
|
||
<span class="s1">'blog_author'</span> <span class="o">=></span> <span class="k">array</span><span class="p">(</span>
|
||
<span class="s1">'type'</span> <span class="o">=></span><span class="s1">'VARCHAR'</span><span class="p">,</span>
|
||
<span class="s1">'constraint'</span> <span class="o">=></span> <span class="s1">'100'</span><span class="p">,</span>
|
||
<span class="s1">'default'</span> <span class="o">=></span> <span class="s1">'King of Town'</span><span class="p">,</span>
|
||
<span class="p">),</span>
|
||
<span class="s1">'blog_description'</span> <span class="o">=></span> <span class="k">array</span><span class="p">(</span>
|
||
<span class="s1">'type'</span> <span class="o">=></span> <span class="s1">'TEXT'</span><span class="p">,</span>
|
||
<span class="s1">'null'</span> <span class="o">=></span> <span class="k">TRUE</span><span class="p">,</span>
|
||
<span class="p">),</span>
|
||
<span class="p">);</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>After the fields have been defined, they can be added using
|
||
<code class="docutils literal"><span class="pre">$this->dbforge->add_field($fields);</span></code> followed by a call to the
|
||
<code class="docutils literal"><span class="pre">create_table()</span></code> method.</p>
|
||
<p><strong>$this->dbforge->add_field()</strong></p>
|
||
<p>The add fields method will accept the above array.</p>
|
||
<div class="section" id="passing-strings-as-fields">
|
||
<h4>Passing strings as fields<a class="headerlink" href="#passing-strings-as-fields" title="Permalink to this headline">¶</a></h4>
|
||
<p>If you know exactly how you want a field to be created, you can pass the
|
||
string into the field definitions with add_field()</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">add_field</span><span class="p">(</span><span class="s2">"label varchar(100) NOT NULL DEFAULT 'default label'"</span><span class="p">);</span>
|
||
</pre></div>
|
||
</div>
|
||
<div class="admonition note">
|
||
<p class="first admonition-title">Note</p>
|
||
<p class="last">Passing raw strings as fields cannot be followed by <code class="docutils literal"><span class="pre">add_key()</span></code> calls on those fields.</p>
|
||
</div>
|
||
<div class="admonition note">
|
||
<p class="first admonition-title">Note</p>
|
||
<p class="last">Multiple calls to add_field() are cumulative.</p>
|
||
</div>
|
||
</div>
|
||
<div class="section" id="creating-an-id-field">
|
||
<h4>Creating an id field<a class="headerlink" href="#creating-an-id-field" title="Permalink to this headline">¶</a></h4>
|
||
<p>There is a special exception for creating id fields. A field with type
|
||
id will automatically be assigned as an INT(9) auto_incrementing
|
||
Primary Key.</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">add_field</span><span class="p">(</span><span class="s1">'id'</span><span class="p">);</span>
|
||
<span class="c1">// gives id INT(9) NOT NULL AUTO_INCREMENT</span>
|
||
</pre></div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<div class="section" id="adding-keys">
|
||
<h3><a class="toc-backref" href="#id6">Adding Keys</a><a class="headerlink" href="#adding-keys" title="Permalink to this headline">¶</a></h3>
|
||
<p>Generally speaking, you’ll want your table to have Keys. This is
|
||
accomplished with $this->dbforge->add_key(‘field’). An optional second
|
||
parameter set to TRUE will make it a primary key. Note that add_key()
|
||
must be followed by a call to create_table().</p>
|
||
<p>Multiple column non-primary keys must be sent as an array. Sample output
|
||
below is for MySQL.</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">add_key</span><span class="p">(</span><span class="s1">'blog_id'</span><span class="p">,</span> <span class="k">TRUE</span><span class="p">);</span>
|
||
<span class="c1">// gives PRIMARY KEY `blog_id` (`blog_id`)</span>
|
||
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">add_key</span><span class="p">(</span><span class="s1">'blog_id'</span><span class="p">,</span> <span class="k">TRUE</span><span class="p">);</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">add_key</span><span class="p">(</span><span class="s1">'site_id'</span><span class="p">,</span> <span class="k">TRUE</span><span class="p">);</span>
|
||
<span class="c1">// gives PRIMARY KEY `blog_id_site_id` (`blog_id`, `site_id`)</span>
|
||
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">add_key</span><span class="p">(</span><span class="s1">'blog_name'</span><span class="p">);</span>
|
||
<span class="c1">// gives KEY `blog_name` (`blog_name`)</span>
|
||
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">add_key</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="s1">'blog_name'</span><span class="p">,</span> <span class="s1">'blog_label'</span><span class="p">));</span>
|
||
<span class="c1">// gives KEY `blog_name_blog_label` (`blog_name`, `blog_label`)</span>
|
||
</pre></div>
|
||
</div>
|
||
</div>
|
||
<div class="section" id="creating-a-table">
|
||
<h3><a class="toc-backref" href="#id7">Creating a table</a><a class="headerlink" href="#creating-a-table" title="Permalink to this headline">¶</a></h3>
|
||
<p>After fields and keys have been declared, you can create a new table
|
||
with</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">create_table</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">);</span>
|
||
<span class="c1">// gives CREATE TABLE table_name</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>An optional second parameter set to TRUE adds an “IF NOT EXISTS” clause
|
||
into the definition</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">create_table</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">,</span> <span class="k">TRUE</span><span class="p">);</span>
|
||
<span class="c1">// gives CREATE TABLE IF NOT EXISTS table_name</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>You could also pass optional table attributes, such as MySQL’s <code class="docutils literal"><span class="pre">ENGINE</span></code>:</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$attributes</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'ENGINE'</span> <span class="o">=></span> <span class="s1">'InnoDB'</span><span class="p">);</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">create_table</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">,</span> <span class="k">FALSE</span><span class="p">,</span> <span class="nv">$attributes</span><span class="p">);</span>
|
||
<span class="c1">// produces: CREATE TABLE `table_name` (...) ENGINE = InnoDB DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci</span>
|
||
</pre></div>
|
||
</div>
|
||
<div class="admonition note">
|
||
<p class="first admonition-title">Note</p>
|
||
<p class="last">Unless you specify the <code class="docutils literal"><span class="pre">CHARACTER</span> <span class="pre">SET</span></code> and/or <code class="docutils literal"><span class="pre">COLLATE</span></code> attributes,
|
||
<code class="docutils literal"><span class="pre">create_table()</span></code> will always add them with your configured <em>char_set</em>
|
||
and <em>dbcollat</em> values, as long as they are not empty (MySQL only).</p>
|
||
</div>
|
||
</div>
|
||
<div class="section" id="dropping-a-table">
|
||
<h3><a class="toc-backref" href="#id8">Dropping a table</a><a class="headerlink" href="#dropping-a-table" title="Permalink to this headline">¶</a></h3>
|
||
<p>Execute a DROP TABLE statement and optionally add an IF EXISTS clause.</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// Produces: DROP TABLE table_name</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">drop_table</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">);</span>
|
||
|
||
<span class="c1">// Produces: DROP TABLE IF EXISTS table_name</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">drop_table</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">,</span><span class="k">TRUE</span><span class="p">);</span>
|
||
</pre></div>
|
||
</div>
|
||
</div>
|
||
<div class="section" id="renaming-a-table">
|
||
<h3><a class="toc-backref" href="#id9">Renaming a table</a><a class="headerlink" href="#renaming-a-table" title="Permalink to this headline">¶</a></h3>
|
||
<p>Executes a TABLE rename</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">rename_table</span><span class="p">(</span><span class="s1">'old_table_name'</span><span class="p">,</span> <span class="s1">'new_table_name'</span><span class="p">);</span>
|
||
<span class="c1">// gives ALTER TABLE old_table_name RENAME TO new_table_name</span>
|
||
</pre></div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<div class="section" id="modifying-tables">
|
||
<h2><a class="toc-backref" href="#id10">Modifying Tables</a><a class="headerlink" href="#modifying-tables" title="Permalink to this headline">¶</a></h2>
|
||
<div class="section" id="adding-a-column-to-a-table">
|
||
<h3><a class="toc-backref" href="#id11">Adding a Column to a Table</a><a class="headerlink" href="#adding-a-column-to-a-table" title="Permalink to this headline">¶</a></h3>
|
||
<p><strong>$this->dbforge->add_column()</strong></p>
|
||
<p>The <code class="docutils literal"><span class="pre">add_column()</span></code> method is used to modify an existing table. It
|
||
accepts the same field array as above, and can be used for an unlimited
|
||
number of additional fields.</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$fields</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
|
||
<span class="s1">'preferences'</span> <span class="o">=></span> <span class="k">array</span><span class="p">(</span><span class="s1">'type'</span> <span class="o">=></span> <span class="s1">'TEXT'</span><span class="p">)</span>
|
||
<span class="p">);</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">add_column</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">,</span> <span class="nv">$fields</span><span class="p">);</span>
|
||
<span class="c1">// Executes: ALTER TABLE table_name ADD preferences TEXT</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>If you are using MySQL or CUBIRD, then you can take advantage of their
|
||
AFTER and FIRST clauses to position the new column.</p>
|
||
<p>Examples:</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// Will place the new column after the `another_field` column:</span>
|
||
<span class="nv">$fields</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
|
||
<span class="s1">'preferences'</span> <span class="o">=></span> <span class="k">array</span><span class="p">(</span><span class="s1">'type'</span> <span class="o">=></span> <span class="s1">'TEXT'</span><span class="p">,</span> <span class="s1">'after'</span> <span class="o">=></span> <span class="s1">'another_field'</span><span class="p">)</span>
|
||
<span class="p">);</span>
|
||
|
||
<span class="c1">// Will place the new column at the start of the table definition:</span>
|
||
<span class="nv">$fields</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
|
||
<span class="s1">'preferences'</span> <span class="o">=></span> <span class="k">array</span><span class="p">(</span><span class="s1">'type'</span> <span class="o">=></span> <span class="s1">'TEXT'</span><span class="p">,</span> <span class="s1">'first'</span> <span class="o">=></span> <span class="k">TRUE</span><span class="p">)</span>
|
||
<span class="p">);</span>
|
||
</pre></div>
|
||
</div>
|
||
</div>
|
||
<div class="section" id="dropping-a-column-from-a-table">
|
||
<h3><a class="toc-backref" href="#id12">Dropping a Column From a Table</a><a class="headerlink" href="#dropping-a-column-from-a-table" title="Permalink to this headline">¶</a></h3>
|
||
<p><strong>$this->dbforge->drop_column()</strong></p>
|
||
<p>Used to remove a column from a table.</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">drop_column</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">,</span> <span class="s1">'column_to_drop'</span><span class="p">);</span>
|
||
</pre></div>
|
||
</div>
|
||
</div>
|
||
<div class="section" id="modifying-a-column-in-a-table">
|
||
<h3><a class="toc-backref" href="#id13">Modifying a Column in a Table</a><a class="headerlink" href="#modifying-a-column-in-a-table" title="Permalink to this headline">¶</a></h3>
|
||
<p><strong>$this->dbforge->modify_column()</strong></p>
|
||
<p>The usage of this method is identical to <code class="docutils literal"><span class="pre">add_column()</span></code>, except it
|
||
alters an existing column rather than adding a new one. In order to
|
||
change the name you can add a “name” key into the field defining array.</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$fields</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
|
||
<span class="s1">'old_name'</span> <span class="o">=></span> <span class="k">array</span><span class="p">(</span>
|
||
<span class="s1">'name'</span> <span class="o">=></span> <span class="s1">'new_name'</span><span class="p">,</span>
|
||
<span class="s1">'type'</span> <span class="o">=></span> <span class="s1">'TEXT'</span><span class="p">,</span>
|
||
<span class="p">),</span>
|
||
<span class="p">);</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">modify_column</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">,</span> <span class="nv">$fields</span><span class="p">);</span>
|
||
<span class="c1">// gives ALTER TABLE table_name CHANGE old_name new_name TEXT</span>
|
||
</pre></div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<div class="section" id="class-reference">
|
||
<h2><a class="toc-backref" href="#id14">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline">¶</a></h2>
|
||
<dl class="class">
|
||
<dt id="CI_DB_forge">
|
||
<em class="property">class </em><code class="descname">CI_DB_forge</code><a class="headerlink" href="#CI_DB_forge" title="Permalink to this definition">¶</a></dt>
|
||
<dd><dl class="method">
|
||
<dt id="CI_DB_forge::add_column">
|
||
<code class="descname">add_column</code><span class="sig-paren">(</span><em>$table</em><span class="optional">[</span>, <em>$field = array()</em><span class="optional">[</span>, <em>$_after = NULL</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_DB_forge::add_column" title="Permalink to this definition">¶</a></dt>
|
||
<dd><table class="docutils field-list" frame="void" rules="none">
|
||
<col class="field-name" />
|
||
<col class="field-body" />
|
||
<tbody valign="top">
|
||
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
||
<li><strong>$table</strong> (<em>string</em>) – Table name to add the column to</li>
|
||
<li><strong>$field</strong> (<em>array</em>) – Column definition(s)</li>
|
||
<li><strong>$_after</strong> (<em>string</em>) – Column for AFTER clause (deprecated)</li>
|
||
</ul>
|
||
</td>
|
||
</tr>
|
||
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
|
||
</td>
|
||
</tr>
|
||
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<p>Adds a column to a table. Usage: See <a class="reference internal" href="#adding-a-column-to-a-table">Adding a Column to a Table</a>.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="method">
|
||
<dt id="CI_DB_forge::add_field">
|
||
<code class="descname">add_field</code><span class="sig-paren">(</span><em>$field</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_DB_forge::add_field" title="Permalink to this definition">¶</a></dt>
|
||
<dd><table class="docutils field-list" frame="void" rules="none">
|
||
<col class="field-name" />
|
||
<col class="field-body" />
|
||
<tbody valign="top">
|
||
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
||
<li><strong>$field</strong> (<em>array</em>) – Field definition to add</li>
|
||
</ul>
|
||
</td>
|
||
</tr>
|
||
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">CI_DB_forge instance (method chaining)</p>
|
||
</td>
|
||
</tr>
|
||
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">CI_DB_forge</p>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<p>Adds a field to the set that will be used to create a table. Usage: See <a class="reference internal" href="#adding-fields">Adding fields</a>.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="method">
|
||
<dt id="CI_DB_forge::add_key">
|
||
<code class="descname">add_key</code><span class="sig-paren">(</span><em>$key</em><span class="optional">[</span>, <em>$primary = FALSE</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_DB_forge::add_key" title="Permalink to this definition">¶</a></dt>
|
||
<dd><table class="docutils field-list" frame="void" rules="none">
|
||
<col class="field-name" />
|
||
<col class="field-body" />
|
||
<tbody valign="top">
|
||
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
||
<li><strong>$key</strong> (<em>array</em>) – Name of a key field</li>
|
||
<li><strong>$primary</strong> (<em>bool</em>) – Set to TRUE if it should be a primary key or a regular one</li>
|
||
</ul>
|
||
</td>
|
||
</tr>
|
||
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">CI_DB_forge instance (method chaining)</p>
|
||
</td>
|
||
</tr>
|
||
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">CI_DB_forge</p>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<p>Adds a key to the set that will be used to create a table. Usage: See <a class="reference internal" href="#adding-keys">Adding Keys</a>.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="method">
|
||
<dt id="CI_DB_forge::create_database">
|
||
<code class="descname">create_database</code><span class="sig-paren">(</span><em>$db_name</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_DB_forge::create_database" title="Permalink to this definition">¶</a></dt>
|
||
<dd><table class="docutils field-list" frame="void" rules="none">
|
||
<col class="field-name" />
|
||
<col class="field-body" />
|
||
<tbody valign="top">
|
||
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
||
<li><strong>$db_name</strong> (<em>string</em>) – Name of the database to create</li>
|
||
</ul>
|
||
</td>
|
||
</tr>
|
||
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
|
||
</td>
|
||
</tr>
|
||
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<p>Creates a new database. Usage: See <a class="reference internal" href="#creating-and-dropping-databases">Creating and Dropping Databases</a>.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="method">
|
||
<dt id="CI_DB_forge::create_table">
|
||
<code class="descname">create_table</code><span class="sig-paren">(</span><em>$table</em><span class="optional">[</span>, <em>$if_not_exists = FALSE</em><span class="optional">[</span>, <em>array $attributes = array()</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_DB_forge::create_table" title="Permalink to this definition">¶</a></dt>
|
||
<dd><table class="docutils field-list" frame="void" rules="none">
|
||
<col class="field-name" />
|
||
<col class="field-body" />
|
||
<tbody valign="top">
|
||
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
||
<li><strong>$table</strong> (<em>string</em>) – Name of the table to create</li>
|
||
<li><strong>$if_not_exists</strong> (<em>string</em>) – Set to TRUE to add an ‘IF NOT EXISTS’ clause</li>
|
||
<li><strong>$attributes</strong> (<em>string</em>) – An associative array of table attributes</li>
|
||
</ul>
|
||
</td>
|
||
</tr>
|
||
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
|
||
</td>
|
||
</tr>
|
||
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<p>Creates a new table. Usage: See <a class="reference internal" href="#creating-a-table">Creating a table</a>.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="method">
|
||
<dt id="CI_DB_forge::drop_column">
|
||
<code class="descname">drop_column</code><span class="sig-paren">(</span><em>$table</em>, <em>$column_name</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_DB_forge::drop_column" title="Permalink to this definition">¶</a></dt>
|
||
<dd><table class="docutils field-list" frame="void" rules="none">
|
||
<col class="field-name" />
|
||
<col class="field-body" />
|
||
<tbody valign="top">
|
||
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
||
<li><strong>$table</strong> (<em>string</em>) – Table name</li>
|
||
<li><strong>$column_name</strong> (<em>array</em>) – The column name to drop</li>
|
||
</ul>
|
||
</td>
|
||
</tr>
|
||
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
|
||
</td>
|
||
</tr>
|
||
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<p>Drops a column from a table. Usage: See <a class="reference internal" href="#dropping-a-column-from-a-table">Dropping a Column From a Table</a>.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="method">
|
||
<dt id="CI_DB_forge::drop_database">
|
||
<code class="descname">drop_database</code><span class="sig-paren">(</span><em>$db_name</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_DB_forge::drop_database" title="Permalink to this definition">¶</a></dt>
|
||
<dd><table class="docutils field-list" frame="void" rules="none">
|
||
<col class="field-name" />
|
||
<col class="field-body" />
|
||
<tbody valign="top">
|
||
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
||
<li><strong>$db_name</strong> (<em>string</em>) – Name of the database to drop</li>
|
||
</ul>
|
||
</td>
|
||
</tr>
|
||
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
|
||
</td>
|
||
</tr>
|
||
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<p>Drops a database. Usage: See <a class="reference internal" href="#creating-and-dropping-databases">Creating and Dropping Databases</a>.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="method">
|
||
<dt id="CI_DB_forge::drop_table">
|
||
<code class="descname">drop_table</code><span class="sig-paren">(</span><em>$table_name</em><span class="optional">[</span>, <em>$if_exists = FALSE</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_DB_forge::drop_table" title="Permalink to this definition">¶</a></dt>
|
||
<dd><table class="docutils field-list" frame="void" rules="none">
|
||
<col class="field-name" />
|
||
<col class="field-body" />
|
||
<tbody valign="top">
|
||
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
||
<li><strong>$table</strong> (<em>string</em>) – Name of the table to drop</li>
|
||
<li><strong>$if_exists</strong> (<em>string</em>) – Set to TRUE to add an ‘IF EXISTS’ clause</li>
|
||
</ul>
|
||
</td>
|
||
</tr>
|
||
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
|
||
</td>
|
||
</tr>
|
||
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<p>Drops a table. Usage: See <a class="reference internal" href="#dropping-a-table">Dropping a table</a>.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="method">
|
||
<dt id="CI_DB_forge::modify_column">
|
||
<code class="descname">modify_column</code><span class="sig-paren">(</span><em>$table</em>, <em>$field</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_DB_forge::modify_column" title="Permalink to this definition">¶</a></dt>
|
||
<dd><table class="docutils field-list" frame="void" rules="none">
|
||
<col class="field-name" />
|
||
<col class="field-body" />
|
||
<tbody valign="top">
|
||
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
||
<li><strong>$table</strong> (<em>string</em>) – Table name</li>
|
||
<li><strong>$field</strong> (<em>array</em>) – Column definition(s)</li>
|
||
</ul>
|
||
</td>
|
||
</tr>
|
||
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
|
||
</td>
|
||
</tr>
|
||
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<p>Modifies a table column. Usage: See <a class="reference internal" href="#modifying-a-column-in-a-table">Modifying a Column in a Table</a>.</p>
|
||
</dd></dl>
|
||
|
||
<dl class="method">
|
||
<dt id="CI_DB_forge::rename_table">
|
||
<code class="descname">rename_table</code><span class="sig-paren">(</span><em>$table_name</em>, <em>$new_table_name</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_DB_forge::rename_table" title="Permalink to this definition">¶</a></dt>
|
||
<dd><table class="docutils field-list" frame="void" rules="none">
|
||
<col class="field-name" />
|
||
<col class="field-body" />
|
||
<tbody valign="top">
|
||
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
||
<li><strong>$table</strong> (<em>string</em>) – Current of the table</li>
|
||
<li><strong>$new_table_name</strong> (<em>string</em>) – New name of the table</li>
|
||
</ul>
|
||
</td>
|
||
</tr>
|
||
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
|
||
</td>
|
||
</tr>
|
||
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<p>Renames a table. Usage: See <a class="reference internal" href="#renaming-a-table">Renaming a table</a>.</p>
|
||
</dd></dl>
|
||
|
||
</dd></dl>
|
||
|
||
</div>
|
||
</div>
|
||
|
||
|
||
</div>
|
||
<footer>
|
||
|
||
<div class="rst-footer-buttons" role="navigation" aria-label="footer navigation">
|
||
|
||
<a href="utilities.html" class="btn btn-neutral float-right" title="Database Utility Class">Next <span class="fa fa-arrow-circle-right"></span></a>
|
||
|
||
|
||
<a href="caching.html" class="btn btn-neutral" title="Database Caching Class"><span class="fa fa-arrow-circle-left"></span> Previous</a>
|
||
|
||
</div>
|
||
|
||
|
||
<hr/>
|
||
|
||
<div role="contentinfo">
|
||
<p>
|
||
© Copyright 2014 - 2019, British Columbia Institute of Technology.
|
||
Last updated on Sep 19, 2019.
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||
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