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@ -851,7 +851,7 @@ db.SetLogger(log.New(os.Stdout, <span class="hljs-string">"\r\n"</span
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@ -984,7 +984,7 @@ db.Model(&user).Association(<span class="hljs-string">"Languages"<
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</div>
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@ -788,7 +788,7 @@ If you want to use those changes in your callbacks, you need to run your SQL in
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@ -758,7 +758,7 @@
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<script>
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</div>
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24
crud.html
24
crud.html
@ -686,19 +686,35 @@ db.Create(&user)
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db.NewRecord(user) <span class="hljs-comment">// => return `false` after `user` created</span>
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</code></pre>
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<h3 id="default-values">Default Values</h3>
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<p>You could define default value in the <code>gorm</code> tag, then the inserting SQL will ignore these fields that has default value and its value is blank, and after insert the record into database, gorm will load those fields's value from database.</p>
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<p>You could define field's default value with tag, for example:</p>
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<pre><code class="lang-go"><span class="hljs-keyword">type</span> Animal <span class="hljs-keyword">struct</span> {
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ID <span class="hljs-keyword">int64</span>
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Name <span class="hljs-keyword">string</span> <span class="hljs-string">`gorm:"default:'galeone'"`</span>
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Age <span class="hljs-keyword">int64</span>
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}
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<span class="hljs-keyword">var</span> animal = Animal{Age: <span class="hljs-number">99</span>, Name: <span class="hljs-string">""</span>}
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</code></pre>
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<p>Then the inserting SQL will exclude those fields that don't have value or having <a href="https://tour.golang.org/basics/12" target="_blank">zero values</a>, after insert the record into database, gorm will load those fields's value from database.</p>
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<pre><code class="lang-go"><span class="hljs-keyword">var</span> animal = Animal{Age: <span class="hljs-number">99</span>, Name: <span class="hljs-string">""</span>}
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db.Create(&animal)
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<span class="hljs-comment">// INSERT INTO animals("age") values('99');</span>
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<span class="hljs-comment">// SELECT name from animals WHERE ID=111; // the returning primary key is 111</span>
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<span class="hljs-comment">// animal.Name => 'galeone'</span>
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</code></pre>
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<p><strong>NOTE</strong> all fields having zero value, like <code>0</code>, <code>''</code>, <code>false</code> or other <a href="https://tour.golang.org/basics/12" target="_blank">zero values</a> won't be saved into database but will use its default value, it you want to avoid this, consider to use pointer type or scaner/valuer, eg:</p>
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<pre><code class="lang-go"><span class="hljs-comment">// Use pointer value</span>
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<span class="hljs-keyword">type</span> User <span class="hljs-keyword">struct</span> {
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gorm.Model
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Name <span class="hljs-keyword">string</span>
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Age *<span class="hljs-keyword">int</span> <span class="hljs-string">`gorm:"default:18"`</span>
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}
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<span class="hljs-comment">// Use scanner/valuer</span>
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<span class="hljs-keyword">type</span> User <span class="hljs-keyword">struct</span> {
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gorm.Model
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Name <span class="hljs-keyword">string</span>
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Age sql.NullInt64 <span class="hljs-string">`gorm:"default:18"`</span>
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}
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</code></pre>
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<h3 id="setting-primary-key-in-callbacks">Setting Primary Key In Callbacks</h3>
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<p>If you want to set primary field's value in <code>BeforeCreate</code> callback, you could use <code>scope.SetColumn</code>, for example:</p>
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<pre><code class="lang-go"><span class="hljs-keyword">func</span> (user *User) BeforeCreate(scope *gorm.Scope) error {
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@ -1371,7 +1387,7 @@ db.Set(<span class="hljs-string">"gorm:association_save_reference"</sp
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|
||||
});
|
||||
</script>
|
||||
</div>
|
||||
|
||||
@ -845,7 +845,7 @@ db.Model(&User{}).RemoveIndex(<span class="hljs-string">"idx_user_name&
|
||||
<script>
|
||||
var gitbook = gitbook || [];
|
||||
gitbook.push(function() {
|
||||
gitbook.page.hasChanged({"page":{"title":"Database","level":"1.2","depth":1,"next":{"title":"Database Connection","level":"1.2.1","depth":2,"anchor":"#connecting-to-a-database","path":"database.md","ref":"database.md#connecting-to-a-database","articles":[]},"previous":{"title":"Getting Started with GORM","level":"1.1","depth":1,"path":"README.md","ref":"README.md","articles":[]},"dir":"ltr"},"config":{"plugins":["github","edit-link"],"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"fontsettings":{"theme":"night","family":"sans","size":2},"github":{"url":"https://github.com/jinzhu/gorm"},"edit-link":{"label":"Edit This Page","base":"https://github.com/jinzhu/gorm/edit/gh-pages/documents/"},"highlight":{},"search":{},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"GORM Guide","gitbook":"*"},"file":{"path":"database.md","mtime":"2018-02-12T02:03:17.823Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-02-12T02:15:52.087Z"},"basePath":".","book":{"language":""}});
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|
||||
});
|
||||
</script>
|
||||
</div>
|
||||
|
||||
@ -791,7 +791,7 @@ db.Callback().RowQuery().Register(<span class="hljs-string">"publish:update
|
||||
<script>
|
||||
var gitbook = gitbook || [];
|
||||
gitbook.push(function() {
|
||||
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|
||||
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|
||||
});
|
||||
</script>
|
||||
</div>
|
||||
|
||||
@ -765,7 +765,7 @@ fmt.Println(<span class="hljs-string">"Inserted fields are as expected:&quo
|
||||
<script>
|
||||
var gitbook = gitbook || [];
|
||||
gitbook.push(function() {
|
||||
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||||
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|
||||
});
|
||||
</script>
|
||||
</div>
|
||||
|
||||
@ -18,7 +18,7 @@ db.NewRecord(user) // => return `false` after `user` created
|
||||
|
||||
### Default Values
|
||||
|
||||
You could define default value in the `gorm` tag, then the inserting SQL will ignore these fields that has default value and its value is blank, and after insert the record into database, gorm will load those fields's value from database.
|
||||
You could define field's default value with tag, for example:
|
||||
|
||||
```go
|
||||
type Animal struct {
|
||||
@ -26,7 +26,11 @@ type Animal struct {
|
||||
Name string `gorm:"default:'galeone'"`
|
||||
Age int64
|
||||
}
|
||||
```
|
||||
|
||||
Then the inserting SQL will exclude those fields that don't have value or having [zero values](https://tour.golang.org/basics/12), after insert the record into database, gorm will load those fields's value from database.
|
||||
|
||||
```go
|
||||
var animal = Animal{Age: 99, Name: ""}
|
||||
db.Create(&animal)
|
||||
// INSERT INTO animals("age") values('99');
|
||||
@ -34,6 +38,24 @@ db.Create(&animal)
|
||||
// animal.Name => 'galeone'
|
||||
```
|
||||
|
||||
**NOTE** all fields having zero value, like `0`, `''`, `false` or other [zero values](https://tour.golang.org/basics/12) won't be saved into database but will use its default value, it you want to avoid this, consider to use pointer type or scaner/valuer, eg:
|
||||
|
||||
```go
|
||||
// Use pointer value
|
||||
type User struct {
|
||||
gorm.Model
|
||||
Name string
|
||||
Age *int `gorm:"default:18"`
|
||||
}
|
||||
|
||||
// Use scanner/valuer
|
||||
type User struct {
|
||||
gorm.Model
|
||||
Name string
|
||||
Age sql.NullInt64 `gorm:"default:18"`
|
||||
}
|
||||
```
|
||||
|
||||
### Setting Primary Key In Callbacks
|
||||
|
||||
If you want to set primary field's value in `BeforeCreate` callback, you could use `scope.SetColumn`, for example:
|
||||
|
||||
@ -789,7 +789,7 @@
|
||||
<script>
|
||||
var gitbook = gitbook || [];
|
||||
gitbook.push(function() {
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||||
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|
||||
</script>
|
||||
</div>
|
||||
|
||||
@ -857,7 +857,7 @@ db.Model(&user).Update(<span class="hljs-string">"name"</span>, <s
|
||||
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|
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|
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