826 lines
24 KiB
HTML
826 lines
24 KiB
HTML
<!DOCTYPE HTML>
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<title>Database · GORM Guide</title>
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<body>
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<div class="book"
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data-level="1"
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data-chapter-title="Database"
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data-filepath="database.md"
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data-basepath="."
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data-revision="Wed Mar 09 2016 07:36:05 GMT+0800 (CST)"
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<li class="chapter " data-level="0" data-path="./">
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<a href="./">
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Getting Started with GORM
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</a>
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</li>
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<li class="chapter active" data-level="1" data-path="database.html">
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<a href="database.html">
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<b>1.</b>
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Database
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.1" data-path="database.html">
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<a href="database.html#connecting-to-a-database">
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<b>1.1.</b>
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Database Connection
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</a>
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</li>
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<li class="chapter " data-level="1.2" data-path="database.html">
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<a href="database.html#migration">
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<b>1.2.</b>
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Migration
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="2" data-path="models.html">
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<a href="models.html">
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<b>2.</b>
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Models
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</a>
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<ul class="articles">
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<li class="chapter " data-level="2.1" data-path="models.html">
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<a href="models.html#model-defination">
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<b>2.1.</b>
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Model Defination
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</a>
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</li>
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<li class="chapter " data-level="2.2" data-path="models.html">
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<a href="models.html#conventions">
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<b>2.2.</b>
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Conventions & Overriding
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</a>
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</li>
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<li class="chapter " data-level="2.3" data-path="associations.html">
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<a href="associations.html">
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<b>2.3.</b>
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Associations
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</a>
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<ul class="articles">
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<li class="chapter " data-level="2.3.1" data-path="associations.html">
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<a href="associations.html#belongs-to">
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<b>2.3.1.</b>
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Belongs To
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</a>
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</li>
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<li class="chapter " data-level="2.3.2" data-path="associations.html">
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<a href="associations.html#has-one">
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<b>2.3.2.</b>
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Has One
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</a>
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</li>
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<li class="chapter " data-level="2.3.3" data-path="associations.html">
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<a href="associations.html#has-many">
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<b>2.3.3.</b>
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Has Many
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</a>
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</li>
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<li class="chapter " data-level="2.3.4" data-path="associations.html">
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<a href="associations.html#many-to-many">
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<b>2.3.4.</b>
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Many To Many
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</a>
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</li>
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<li class="chapter " data-level="2.3.5" data-path="associations.html">
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<a href="associations.html#polymorphism">
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<b>2.3.5.</b>
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Polymorphism
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</a>
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</li>
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<li class="chapter " data-level="2.3.6" data-path="associations.html">
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<a href="associations.html#association-mode">
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<b>2.3.6.</b>
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Association Mode
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</a>
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</li>
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</ul>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3" data-path="curd.html">
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<a href="curd.html">
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<b>3.</b>
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CRUD: Reading and Writing Data
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.1" data-path="curd.html">
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<a href="curd.html#create">
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<b>3.1.</b>
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Create
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</a>
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</li>
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<li class="chapter " data-level="3.2" data-path="curd.html">
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<a href="curd.html#query">
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<b>3.2.</b>
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Query
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</a>
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</li>
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<li class="chapter " data-level="3.3" data-path="curd.html">
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<a href="curd.html#preloading-eager-loading">
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<b>3.3.</b>
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Preloading (Eager Loading)
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</a>
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</li>
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<li class="chapter " data-level="3.4" data-path="curd.html">
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<a href="curd.html#update">
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<b>3.4.</b>
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Update
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</a>
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</li>
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<li class="chapter " data-level="3.5" data-path="curd.html">
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<a href="curd.html#delete">
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<b>3.5.</b>
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Delete / Soft Delete
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="4" data-path="callbacks.html">
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<a href="callbacks.html">
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<b>4.</b>
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Callbacks
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</a>
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</li>
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<li class="chapter " data-level="5" data-path="advanced.html">
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<a href="advanced.html">
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<b>5.</b>
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Advanced Usage
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</a>
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<ul class="articles">
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<li class="chapter " data-level="5.1" data-path="advanced.html">
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<a href="advanced.html#error-handling">
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<b>5.1.</b>
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Error Handling
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</a>
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</li>
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<li class="chapter " data-level="5.2" data-path="advanced.html">
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<a href="advanced.html#transactions">
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<b>5.2.</b>
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Transactions
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</a>
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</li>
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<li class="chapter " data-level="5.3" data-path="advanced.html">
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<a href="advanced.html#sql-builder">
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<b>5.3.</b>
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Raw SQL & SQL Builder
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</a>
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</li>
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<li class="chapter " data-level="5.4" data-path="advanced.html">
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<a href="advanced.html#generic-database-interface-sqldb">
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<b>5.4.</b>
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Generic database interface sql.DB
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</a>
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</li>
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<li class="chapter " data-level="5.5" data-path="advanced.html">
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<a href="advanced.html#compose-primary-key">
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<b>5.5.</b>
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Composite Primary Key
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</a>
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</li>
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<li class="chapter " data-level="5.6" data-path="advanced.html">
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<a href="advanced.html#logger">
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<b>5.6.</b>
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Overriding Logger
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="6" data-path="development.html">
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<a href="development.html">
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<b>6.</b>
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Development
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</a>
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<ul class="articles">
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<li class="chapter " data-level="6.1" data-path="development.html">
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<a href="development.html#architecture">
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<b>6.1.</b>
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Architecture
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</a>
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</li>
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<li class="chapter " data-level="6.2" data-path="development.html">
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<a href="development.html#write-plugins">
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<b>6.2.</b>
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Write Plugins
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="7" data-path="changelog.html">
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<a href="changelog.html">
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<b>7.</b>
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Change Log
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</a>
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</li>
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<li class="divider"></li>
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</ul>
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</nav>
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</div>
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<div class="book-body">
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<div class="body-inner">
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<div class="book-header" role="navigation">
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<!-- Title -->
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<h1>
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<i class="fa fa-circle-o-notch fa-spin"></i>
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<a href="." >Database</a>
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</h1>
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</div>
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<div class="page-wrapper" tabindex="-1" role="main">
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<div class="page-inner">
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<section class="normal markdown-section">
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<h1 id="database">Database</h1>
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<!-- toc -->
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<ul>
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<li><a href="#connecting-to-a-database">Connecting to a database</a><ul>
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<li><a href="#mysql">MySQL</a></li>
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<li><a href="#postgresql">PostgreSQL</a></li>
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<li><a href="#sqlite3">Sqlite3</a></li>
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<li><a href="#write-dialect-for-unsupported-databases">Write Dialect for unsupported databases</a></li>
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</ul>
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</li>
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<li><a href="#migration">Migration</a><ul>
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<li><a href="#auto-migration">Auto Migration</a></li>
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<li><a href="#has-table">Has Table</a></li>
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<li><a href="#create-table">Create Table</a></li>
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<li><a href="#drop-table">Drop table</a></li>
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<li><a href="#modifycolumn">ModifyColumn</a></li>
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<li><a href="#dropcolumn">DropColumn</a></li>
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<li><a href="#add-foreign-key">Add Foreign Key</a></li>
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<li><a href="#indexes">Indexes</a></li>
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</ul>
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</li>
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</ul>
|
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<!-- toc stop -->
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<h2 id="connecting-to-a-database">Connecting to a database</h2>
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<p>When connect to a database, you need to import the database's driver first, for example:</p>
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<pre><code class="lang-go"><span class="hljs-keyword">import</span> _ <span class="hljs-string">"github.com/go-sql-driver/mysql"</span>
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</code></pre>
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<p>GORM has wrapped some drivers, for easier to remember the import path, so you could import the mysql driver with</p>
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<pre><code class="lang-go"><span class="hljs-keyword">import</span> _ <span class="hljs-string">"github.com/jinzhu/gorm/dialects/mysql"</span>
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<span class="hljs-comment">// import _ "github.com/jinzhu/gorm/dialects/postgres"</span>
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<span class="hljs-comment">// import _ "github.com/jinzhu/gorm/dialects/sqlite"</span>
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<span class="hljs-comment">// import _ "github.com/jinzhu/gorm/dialects/mssql"</span>
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</code></pre>
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<h4 id="mysql">MySQL</h4>
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<p><strong>NOTE</strong> in order to handle <code>time.Time</code> you need to include <code>parseTime</code> as param <a href="https://github.com/go-sql-driver/mysql#parameters" target="_blank">more supported parameters</a></p>
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<pre><code class="lang-go"><span class="hljs-keyword">import</span> (
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<span class="hljs-string">"github.com/jinzhu/gorm"</span>
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_ <span class="hljs-string">"github.com/jinzhu/gorm/dialects/mysql"</span>
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)
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<span class="hljs-keyword">func</span> main() {
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db, err := gorm.Open(<span class="hljs-string">"mysql"</span>, <span class="hljs-string">"user:password@/dbname?charset=utf8&parseTime=True&loc=Local"</span>)
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}
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</code></pre>
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<h4 id="postgresql">PostgreSQL</h4>
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|
<pre><code class="lang-go"><span class="hljs-keyword">import</span> (
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<span class="hljs-string">"github.com/jinzhu/gorm"</span>
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|
_ <span class="hljs-string">"github.com/jinzhu/gorm/dialects/postgres"</span>
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)
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<span class="hljs-keyword">func</span> main() {
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db, err := gorm.Open(<span class="hljs-string">"postgres"</span>, <span class="hljs-string">"user=gorm dbname=gorm sslmode=disable"</span>)
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}
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</code></pre>
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<h4 id="sqlite3">Sqlite3</h4>
|
|
<pre><code class="lang-go"><span class="hljs-keyword">import</span> (
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|
<span class="hljs-string">"github.com/jinzhu/gorm"</span>
|
|
_ <span class="hljs-string">"github.com/jinzhu/gorm/dialects/sqlite"</span>
|
|
)
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|
|
|
<span class="hljs-keyword">func</span> main() {
|
|
db, err := gorm.Open(<span class="hljs-string">"sqlite3"</span>, <span class="hljs-string">"/tmp/gorm.db"</span>)
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|
}
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</code></pre>
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<h4 id="write-dialect-for-unsupported-databases">Write Dialect for unsupported databases</h4>
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<p>GORM officially support above databases, but you could write a dialect for those unsupported databaes,</p>
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|
<p>Refer: <a href="https://github.com/jinzhu/gorm/blob/master/dialect.go" target="_blank">https://github.com/jinzhu/gorm/blob/master/dialect.go</a></p>
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<h2 id="migration">Migration</h2>
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<h3 id="auto-migration">Auto Migration</h3>
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<p>Automatically migrate your schema, to keep your schema update to date</p>
|
|
<p><strong>WARNING</strong> AutoMigrate will ONLY create tables, missing columns and missing indexes, <strong>WON'T</strong> change existing column's type or delete unused columns to protect your data</p>
|
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<pre><code class="lang-go">db.AutoMigrate(&User{})
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db.AutoMigrate(&User{}, &Product{}, &Order{})
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|
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<span class="hljs-comment">// Add table suffix when create tables</span>
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db.Set(<span class="hljs-string">"gorm:table_options"</span>, <span class="hljs-string">"ENGINE=InnoDB"</span>).AutoMigrate(&User{})
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</code></pre>
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<h3 id="has-table">Has Table</h3>
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<pre><code class="lang-go"><span class="hljs-comment">// Check model `User`'s table exists or not</span>
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db.HasTable(&User{})
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<span class="hljs-comment">// Check table `users` exists or not</span>
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db.HasTable(<span class="hljs-string">"users"</span>)
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</code></pre>
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<h3 id="create-table">Create Table</h3>
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<pre><code class="lang-go"><span class="hljs-comment">// Create table for model `User`</span>
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db.CreateTable(&User{})
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|
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<span class="hljs-comment">// will append "ENGINE=InnoDB" to the SQL statement when creating table `users`</span>
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db.Set(<span class="hljs-string">"gorm:table_options"</span>, <span class="hljs-string">"ENGINE=InnoDB"</span>).CreateTable(&User{})
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</code></pre>
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<h3 id="drop-table">Drop table</h3>
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<pre><code class="lang-go"><span class="hljs-comment">// Drop model `User`'s table</span>
|
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db.DropTable(&User{})
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|
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<span class="hljs-comment">// Drop table `users</span>
|
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db.DropTable(<span class="hljs-string">"users"</span>)
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|
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<span class="hljs-comment">// Drop model's `User`'s table and table `products`</span>
|
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db.DropTableIfExists(&User{}, <span class="hljs-string">"products"</span>)
|
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</code></pre>
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<h3 id="modifycolumn">ModifyColumn</h3>
|
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<p>Modify column's type to given value</p>
|
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<pre><code class="lang-go"><span class="hljs-comment">// change column description's data type to `text` for model `User`</span>
|
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db.Model(&User{}).ModifyColumn(<span class="hljs-string">"description"</span>, <span class="hljs-string">"text"</span>)
|
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</code></pre>
|
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<h3 id="dropcolumn">DropColumn</h3>
|
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<pre><code class="lang-go"><span class="hljs-comment">// Drop column description from model `User`</span>
|
|
db.Model(&User{}).DropColumn(<span class="hljs-string">"description"</span>)
|
|
</code></pre>
|
|
<h3 id="add-foreign-key">Add Foreign Key</h3>
|
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<pre><code class="lang-go"><span class="hljs-comment">// Add foreign key</span>
|
|
<span class="hljs-comment">// 1st param : foreignkey field</span>
|
|
<span class="hljs-comment">// 2nd param : destination table(id)</span>
|
|
<span class="hljs-comment">// 3rd param : ONDELETE</span>
|
|
<span class="hljs-comment">// 4th param : ONUPDATE</span>
|
|
db.Model(&User{}).AddForeignKey(<span class="hljs-string">"city_id"</span>, <span class="hljs-string">"cities(id)"</span>, <span class="hljs-string">"RESTRICT"</span>, <span class="hljs-string">"RESTRICT"</span>)
|
|
</code></pre>
|
|
<h3 id="indexes">Indexes</h3>
|
|
<pre><code class="lang-go"><span class="hljs-comment">// Add index for columns `name` with given name `idx_user_name`</span>
|
|
db.Model(&User{}).AddIndex(<span class="hljs-string">"idx_user_name"</span>, <span class="hljs-string">"name"</span>)
|
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|
|
<span class="hljs-comment">// Add index for columns `name`, `age` with given name `idx_user_name_age`</span>
|
|
db.Model(&User{}).AddIndex(<span class="hljs-string">"idx_user_name_age"</span>, <span class="hljs-string">"name"</span>, <span class="hljs-string">"age"</span>)
|
|
|
|
<span class="hljs-comment">// Add unique index</span>
|
|
db.Model(&User{}).AddUniqueIndex(<span class="hljs-string">"idx_user_name"</span>, <span class="hljs-string">"name"</span>)
|
|
|
|
<span class="hljs-comment">// Add unique index for multiple columns</span>
|
|
db.Model(&User{}).AddUniqueIndex(<span class="hljs-string">"idx_user_name_age"</span>, <span class="hljs-string">"name"</span>, <span class="hljs-string">"age"</span>)
|
|
|
|
<span class="hljs-comment">// Remove index</span>
|
|
db.Model(&User{}).RemoveIndex(<span class="hljs-string">"idx_user_name"</span>)
|
|
</code></pre>
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