834 lines
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HTML
834 lines
22 KiB
HTML
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<!DOCTYPE HTML>
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<meta charset="UTF-8">
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<title>Dialects · GORM Guide</title>
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<li class="chapter " data-level="1.1" data-path="./">
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<a href="./">
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<b>1.1.</b>
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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 " data-level="1.2" data-path="database.html">
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<a href="database.html">
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<b>1.2.</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="1.2.1" data-path="database.html">
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<a href="database.html#connecting-to-a-database">
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<b>1.2.1.</b>
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Database Connection
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</a>
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<li class="chapter " data-level="1.2.2" data-path="database.html">
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<a href="database.html#migration">
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<b>1.2.2.</b>
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Migration
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</a>
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</ul>
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<li class="chapter " data-level="1.3" data-path="models.html">
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<a href="models.html">
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<b>1.3.</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="1.3.1" data-path="models.html">
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<a href="models.html#model-definition">
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<b>1.3.1.</b>
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Model Definition
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<li class="chapter " data-level="1.3.2" data-path="models.html">
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<a href="models.html#conventions">
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<b>1.3.2.</b>
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Conventions & Overriding
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</a>
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<li class="chapter " data-level="1.3.3" data-path="associations.html">
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<a href="associations.html">
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<b>1.3.3.</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="1.3.3.1" data-path="associations.html">
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<a href="associations.html#belongs-to">
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<b>1.3.3.1.</b>
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Belongs To
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</a>
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<li class="chapter " data-level="1.3.3.2" data-path="associations.html">
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<a href="associations.html#has-one">
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<b>1.3.3.2.</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="1.3.3.3" data-path="associations.html">
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<a href="associations.html#has-many">
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<b>1.3.3.3.</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="1.3.3.4" data-path="associations.html">
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<a href="associations.html#many-to-many">
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<b>1.3.3.4.</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="1.3.3.5" data-path="associations.html">
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<a href="associations.html#polymorphism">
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<b>1.3.3.5.</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="1.3.3.6" data-path="associations.html">
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<a href="associations.html#association-mode">
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<b>1.3.3.6.</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="1.4" data-path="crud.html">
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<a href="crud.html">
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<b>1.4.</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="1.4.1" data-path="crud.html">
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<a href="crud.html#create">
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<b>1.4.1.</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="1.4.2" data-path="crud.html">
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<a href="crud.html#query">
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<b>1.4.2.</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="1.4.3" data-path="crud.html">
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<a href="crud.html#preloading-eager-loading">
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<b>1.4.3.</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="1.4.4" data-path="crud.html">
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<a href="crud.html#update">
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<b>1.4.4.</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="1.4.5" data-path="crud.html">
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<a href="crud.html#delete">
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<b>1.4.5.</b>
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Delete / Soft Delete
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</a>
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</li>
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<li class="chapter " data-level="1.4.6" data-path="crud.html">
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<a href="crud.html#associations">
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<b>1.4.6.</b>
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Associations
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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="1.5" data-path="callbacks.html">
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<a href="callbacks.html">
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<b>1.5.</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="1.6" data-path="advanced.html">
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<a href="advanced.html">
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<b>1.6.</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="1.6.1" data-path="advanced.html">
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<a href="advanced.html#error-handling">
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<b>1.6.1.</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="1.6.2" data-path="advanced.html">
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<a href="advanced.html#transactions">
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<b>1.6.2.</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="1.6.3" data-path="advanced.html">
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<a href="advanced.html#sql-builder">
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<b>1.6.3.</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="1.6.4" data-path="advanced.html">
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<a href="advanced.html#generic-database-interface-sqldb">
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<b>1.6.4.</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="1.6.5" data-path="advanced.html">
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<a href="advanced.html#compose-primary-key">
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<b>1.6.5.</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="1.6.6" data-path="advanced.html">
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<a href="advanced.html#logger">
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<b>1.6.6.</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="1.7" data-path="development.html">
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<a href="development.html">
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<b>1.7.</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="1.7.1" data-path="development.html">
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<a href="development.html#architecture">
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<b>1.7.1.</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="1.7.2" data-path="development.html">
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<a href="development.html#write-plugins">
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<b>1.7.2.</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 active" data-level="1.8" data-path="dialects.html">
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<a href="dialects.html">
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<b>1.8.</b>
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Dialects
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.8.1" data-path="dialects.html">
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<a href="dialects.html#dialect-specific-columns">
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<b>1.8.1.</b>
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Dialect Specific Columns
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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="1.9" data-path="changelog.html">
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<a href="changelog.html">
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<b>1.9.</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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</nav>
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</div>
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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="." >Dialects</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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<div id="book-search-results">
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<div class="search-noresults">
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<section class="normal markdown-section">
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<h1 id="dialects">Dialects</h1>
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<!-- toc -->
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<h2 id="dialect-specific-columns">Dialect Specific Columns</h2>
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<p>Certain dialects of SQL ship with their own custom, non-standard column types, such as the <code>jsonb</code> column in PostgreSQL. GORM supports loading several of such types, as listed in the following sections.</p>
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<h4 id="postgresql">PostgreSQL</h4>
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<p>GORM supports loading the following PostgreSQL exclusive column types:</p>
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<ul>
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<li>jsonb</li>
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<li>hstore</li>
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</ul>
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<p>Given the following Model definition: </p>
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<pre><code class="lang-go"><span class="hljs-keyword">import</span> (
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<span class="hljs-string">"encoding/json"</span>
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<span class="hljs-string">"fmt"</span>
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<span class="hljs-string">"reflect"</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">type</span> Document <span class="hljs-keyword">struct</span> {
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Metadata postgres.Jsonb
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Secrets postgres.Hstore
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Body <span class="hljs-keyword">string</span>
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ID <span class="hljs-keyword">int</span>
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}
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</code></pre>
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<p>You may use the model like so: </p>
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<pre><code class="lang-go">password := <span class="hljs-string">"0654857340"</span>
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metadata := json.RawMessage(<span class="hljs-string">`{"is_archived": 0}`</span>)
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sampleDoc := Document{
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Body : <span class="hljs-string">"This is a test document"</span>,
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Metadata : postgres.Jsonb{ metadata },
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Secrets : postgres.Hstore{<span class="hljs-string">"password"</span> : &password },
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}
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<span class="hljs-comment">//insert sampleDoc into the database</span>
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db.Create(&sampleDoc)
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<span class="hljs-comment">//retrieve the fields again to confirm if they were inserted correctly</span>
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|
resultDoc := Document{}
|
|
db.Where(<span class="hljs-string">"id = ?"</span>, sampleDoc.ID).First(&resultDoc)
|
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|
|
metadataIsEqual := reflect.DeepEqual( resultDoc.Metadata, sampleDoc.Metadata)
|
|
secretsIsEqual := reflect.DeepEqual( resultDoc.Secrets, resultDoc.Secrets)
|
|
|
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<span class="hljs-comment">//this should print "true"</span>
|
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fmt.Println(<span class="hljs-string">"Inserted fields are as expected:"</span>, metadataIsEqual && secretsIsEqual)
|
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</code></pre>
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