849 lines
		
	
	
		
			24 KiB
		
	
	
	
		
			HTML
		
	
	
	
	
	
			
		
		
	
	
			849 lines
		
	
	
		
			24 KiB
		
	
	
	
		
			HTML
		
	
	
	
	
	
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    data-chapter-title="Advanced Usage"
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    data-revision="Wed May 04 2016 21:23:42 GMT+0800 (CST)"
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                <a href="./">
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                    Getting Started with GORM
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        <li class="chapter " 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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                <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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                        <b>1.2.</b>
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                    Migration
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                        <b>2.</b>
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                    Models
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                </a>
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                        <b>2.1.</b>
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                    Model Definition
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                </a>
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                        <b>2.2.</b>
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                    Conventions & Overriding
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                </a>
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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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                <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 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 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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                <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 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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            </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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 | 
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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 active" 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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						|
            
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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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 | 
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                <a href="advanced.html#compose-primary-key">
 | 
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 | 
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 | 
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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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 | 
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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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 | 
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 | 
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                        <b>6.</b>
 | 
						|
                    
 | 
						|
                    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
 | 
						|
            
 | 
						|
                </a>
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        </li>
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        <li class="chapter " data-level="6.2" data-path="development.html">
 | 
						|
            
 | 
						|
                <a href="development.html#write-plugins">
 | 
						|
            
 | 
						|
                    
 | 
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                        <b>6.2.</b>
 | 
						|
                    
 | 
						|
                    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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                            <h1 id="advanced-usage">Advanced Usage</h1>
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<!-- toc -->
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<ul>
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<li><a href="#error-handling">Error Handling</a></li>
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<li><a href="#transactions">Transactions</a><ul>
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<li><a href="#a-specific-example">A Specific Example</a></li>
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</ul>
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<li><a href="#sql-builder">SQL Builder</a><ul>
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<li><a href="#run-raw-sql">Run Raw SQL</a></li>
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<li><a href="#sqlrow-sqlrows">sql.Row & sql.Rows</a></li>
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<li><a href="#scan-sqlrows-in-iteration">Scan sql.Rows In Iteration</a></li>
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</ul>
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</li>
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<li><a href="#generic-database-interface-sqldb">Generic database interface sql.DB</a><ul>
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<li><a href="#connection-pool">Connection Pool</a></li>
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</ul>
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</li>
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<li><a href="#composite-primary-key">Composite Primary Key</a></li>
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<li><a href="#logger">Logger</a><ul>
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<li><a href="#customize-logger">Customize Logger</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="error-handling">Error Handling</h2>
 | 
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<p>After perform any operations, if there are any error happened, GORM will set it to <code>*DB</code>'s <code>Error</code> field</p>
 | 
						|
<pre><code class="lang-go"><span class="hljs-keyword">if</span> err := db.Where(<span class="hljs-string">"name = ?"</span>, <span class="hljs-string">"jinzhu"</span>).First(&user).Error; err != <span class="hljs-literal">nil</span> {
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    <span class="hljs-comment">// error handling...</span>
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}
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<span class="hljs-comment">// If there are more than one error happened, get all of them with `GetErrors`, it returns `[]error`</span>
 | 
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db.First(&user).Limit(<span class="hljs-number">10</span>).Find(&users).GetErrors()
 | 
						|
 | 
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<span class="hljs-comment">// Check if returns RecordNotFound error</span>
 | 
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db.Where(<span class="hljs-string">"name = ?"</span>, <span class="hljs-string">"hello world"</span>).First(&user).RecordNotFound()
 | 
						|
 | 
						|
<span class="hljs-keyword">if</span> db.Model(&user).Related(&credit_card).RecordNotFound() {
 | 
						|
    <span class="hljs-comment">// no credit card found handling</span>
 | 
						|
}
 | 
						|
</code></pre>
 | 
						|
<h2 id="transactions">Transactions</h2>
 | 
						|
<p>To perform a set of operations within a transaction, the general flow is as below.</p>
 | 
						|
<pre><code class="lang-go"><span class="hljs-comment">// begin a transaction</span>
 | 
						|
tx := db.Begin()
 | 
						|
 | 
						|
<span class="hljs-comment">// do some database operations in the transaction (use 'tx' from this point, not 'db')</span>
 | 
						|
tx.Create(...)
 | 
						|
 | 
						|
<span class="hljs-comment">// ...</span>
 | 
						|
 | 
						|
<span class="hljs-comment">// rollback the transaction in case of error</span>
 | 
						|
tx.Rollback()
 | 
						|
 | 
						|
<span class="hljs-comment">// Or commit the transaction</span>
 | 
						|
tx.Commit()
 | 
						|
</code></pre>
 | 
						|
<h3 id="a-specific-example">A Specific Example</h3>
 | 
						|
<pre><code class="lang-go"><span class="hljs-keyword">func</span> CreateAnimals(db *gorm.DB) err {
 | 
						|
  tx := db.Begin()
 | 
						|
  <span class="hljs-comment">// Note the use of tx as the database handle once you are within a transaction</span>
 | 
						|
 | 
						|
  <span class="hljs-keyword">if</span> err := tx.Create(&Animal{Name: <span class="hljs-string">"Giraffe"</span>}).Error; err != <span class="hljs-literal">nil</span> {
 | 
						|
     tx.Rollback()
 | 
						|
     <span class="hljs-keyword">return</span> err
 | 
						|
  }
 | 
						|
 | 
						|
  <span class="hljs-keyword">if</span> err := tx.Create(&Animal{Name: <span class="hljs-string">"Lion"</span>}).Error; err != <span class="hljs-literal">nil</span> {
 | 
						|
     tx.Rollback()
 | 
						|
     <span class="hljs-keyword">return</span> err
 | 
						|
  }
 | 
						|
 | 
						|
  tx.Commit()
 | 
						|
  <span class="hljs-keyword">return</span> <span class="hljs-literal">nil</span>
 | 
						|
}
 | 
						|
</code></pre>
 | 
						|
<h2 id="sql-builder">SQL Builder</h2>
 | 
						|
<h4 id="run-raw-sql">Run Raw SQL</h4>
 | 
						|
<p>Run Raw SQL</p>
 | 
						|
<pre><code class="lang-go">db.Exec(<span class="hljs-string">"DROP TABLE users;"</span>)
 | 
						|
db.Exec(<span class="hljs-string">"UPDATE orders SET shipped_at=? WHERE id IN (?)"</span>, time.Now, []<span class="hljs-keyword">int64</span>{<span class="hljs-number">11</span>,<span class="hljs-number">22</span>,<span class="hljs-number">33</span>})
 | 
						|
 | 
						|
<span class="hljs-comment">// Scan</span>
 | 
						|
<span class="hljs-keyword">type</span> Result <span class="hljs-keyword">struct</span> {
 | 
						|
    Name <span class="hljs-keyword">string</span>
 | 
						|
    Age  <span class="hljs-keyword">int</span>
 | 
						|
}
 | 
						|
 | 
						|
<span class="hljs-keyword">var</span> result Result
 | 
						|
db.Raw(<span class="hljs-string">"SELECT name, age FROM users WHERE name = ?"</span>, <span class="hljs-number">3</span>).Scan(&result)
 | 
						|
</code></pre>
 | 
						|
<h4 id="sqlrow--sqlrows">sql.Row & sql.Rows</h4>
 | 
						|
<p>Get query result as <code>*sql.Row</code> or <code>*sql.Rows</code></p>
 | 
						|
<pre><code class="lang-go">row := db.Table(<span class="hljs-string">"users"</span>).Where(<span class="hljs-string">"name = ?"</span>, <span class="hljs-string">"jinzhu"</span>).Select(<span class="hljs-string">"name, age"</span>).Row() <span class="hljs-comment">// (*sql.Row)</span>
 | 
						|
row.Scan(&name, &age)
 | 
						|
 | 
						|
rows, err := db.Model(&User{}).Where(<span class="hljs-string">"name = ?"</span>, <span class="hljs-string">"jinzhu"</span>).Select(<span class="hljs-string">"name, age, email"</span>).Rows() <span class="hljs-comment">// (*sql.Rows, error)</span>
 | 
						|
<span class="hljs-keyword">defer</span> rows.Close()
 | 
						|
<span class="hljs-keyword">for</span> rows.Next() {
 | 
						|
    ...
 | 
						|
    rows.Scan(&name, &age, &email)
 | 
						|
    ...
 | 
						|
}
 | 
						|
 | 
						|
<span class="hljs-comment">// Raw SQL</span>
 | 
						|
rows, err := db.Raw(<span class="hljs-string">"select name, age, email from users where name = ?"</span>, <span class="hljs-string">"jinzhu"</span>).Rows() <span class="hljs-comment">// (*sql.Rows, error)</span>
 | 
						|
<span class="hljs-keyword">defer</span> rows.Close()
 | 
						|
<span class="hljs-keyword">for</span> rows.Next() {
 | 
						|
    ...
 | 
						|
    rows.Scan(&name, &age, &email)
 | 
						|
    ...
 | 
						|
}
 | 
						|
</code></pre>
 | 
						|
<h4 id="scan-sqlrows-in-iteration">Scan sql.Rows In Iteration</h4>
 | 
						|
<pre><code class="lang-go">rows, err := db.Model(&User{}).Where(<span class="hljs-string">"name = ?"</span>, <span class="hljs-string">"jinzhu"</span>).Select(<span class="hljs-string">"name, age, email"</span>).Rows() <span class="hljs-comment">// (*sql.Rows, error)</span>
 | 
						|
<span class="hljs-keyword">defer</span> rows.Close()
 | 
						|
 | 
						|
<span class="hljs-keyword">for</span> rows.Next() {
 | 
						|
  <span class="hljs-keyword">var</span> user User
 | 
						|
  db.ScanRows(rows, &user)
 | 
						|
  <span class="hljs-comment">// do something</span>
 | 
						|
}
 | 
						|
</code></pre>
 | 
						|
<h2 id="generic-database-interface-sqldb">Generic database interface sql.DB</h2>
 | 
						|
<p>Get generic database interface <a href="http://golang.org/pkg/database/sql/#DB" target="_blank">*sql.DB</a> from <code>*gorm.DB</code> connection</p>
 | 
						|
<pre><code class="lang-go"><span class="hljs-comment">// Get generic database object `*sql.DB` to use its functions</span>
 | 
						|
db.DB()
 | 
						|
 | 
						|
<span class="hljs-comment">// Ping</span>
 | 
						|
db.DB().Ping()
 | 
						|
</code></pre>
 | 
						|
<h4 id="connection-pool">Connection Pool</h4>
 | 
						|
<pre><code class="lang-go">db.DB().SetMaxIdleConns(<span class="hljs-number">10</span>)
 | 
						|
db.DB().SetMaxOpenConns(<span class="hljs-number">100</span>)
 | 
						|
</code></pre>
 | 
						|
<h2 id="composite-primary-key">Composite Primary Key</h2>
 | 
						|
<p>Set multiple fields as priamry key to enable composite primary key</p>
 | 
						|
<pre><code class="lang-go"><span class="hljs-keyword">type</span> Product <span class="hljs-keyword">struct</span> {
 | 
						|
    ID           <span class="hljs-keyword">string</span> <span class="hljs-string">`gorm:"primary_key"`</span>
 | 
						|
    LanguageCode <span class="hljs-keyword">string</span> <span class="hljs-string">`gorm:"primary_key"`</span>
 | 
						|
}
 | 
						|
</code></pre>
 | 
						|
<h2 id="logger">Logger</h2>
 | 
						|
<p>Gorm has built-in logger support, by default, it will print happened errors</p>
 | 
						|
<pre><code class="lang-go"><span class="hljs-comment">// Enable Logger, show detailed log</span>
 | 
						|
db.LogMode(<span class="hljs-literal">true</span>)
 | 
						|
 | 
						|
<span class="hljs-comment">// Diable Logger, don't show any log</span>
 | 
						|
db.LogMode(<span class="hljs-literal">false</span>)
 | 
						|
 | 
						|
<span class="hljs-comment">// Debug a single operation, show detailed log for this operation</span>
 | 
						|
db.Debug().Where(<span class="hljs-string">"name = ?"</span>, <span class="hljs-string">"jinzhu"</span>).First(&User{})
 | 
						|
</code></pre>
 | 
						|
<h4 id="customize-logger">Customize Logger</h4>
 | 
						|
<p>Refer GORM's default logger for how to customize it <a href="https://github.com/jinzhu/gorm/blob/master/logger.go" target="_blank">https://github.com/jinzhu/gorm/blob/master/logger.go</a></p>
 | 
						|
<pre><code class="lang-go">db.SetLogger(gorm.Logger{revel.TRACE})
 | 
						|
db.SetLogger(log.New(os.Stdout, <span class="hljs-string">"\r\n"</span>, <span class="hljs-number">0</span>))
 | 
						|
</code></pre>
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