How to conditionally query in yii framework-YII-php.cn

How to conditionally query in yii framework

爱喝马黛茶的安东尼

Release： 2019-12-07 15:33:15

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Conditional query

$customers = Customer::find()->where($cond)->all();

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$cond is what we call conditions. The way of writing conditions also depends on the query data. There are differences, so how to write query conditions using yii2?

[[Simple condition]]

// SQL: (type = 1) AND (status = 2).  
$cond = [&#39;type&#39; => 1, &#39;status&#39; => 2]   
// SQL:(id IN (1, 2, 3)) AND (status = 2)  
$cond = [&#39;id&#39; => [1, 2, 3], &#39;status&#39; => 2]   
//SQL:status IS NULL  
$cond = [&#39;status&#39; => null]

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[and]: Combine different conditions together, usage example:

//SQL:`id=1 AND id=2`  
$cond = [&#39;and&#39;, &#39;id=1&#39;, &#39;id=2&#39;]  
//SQL:`type=1 AND (id=1 OR id=2)`  
$cond = [&#39;and&#39;, &#39;type=1&#39;, [&#39;or&#39;, &#39;id=1&#39;, &#39;id=2&#39;]]  
//SQL:`type=1 AND (id=1 OR id=2)` //此写法&#39;=&#39;可以换成其他操作符，例：in like != >=等  
$cond = [  
    &#39;and&#39;,  
    [&#39;=&#39;, &#39;type&#39;, 1],  
    [  
        &#39;or&#39;,  
        [&#39;=&#39;, &#39;id&#39;, &#39;1&#39;],  
        [&#39;=&#39;, &#39;id&#39;, &#39;2&#39;],  
    ]  
]

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[[or]]:

/SQL:`(type IN (7, 8, 9) OR (id IN (1, 2, 3)))`  
$cond = [&#39;or&#39;, [&#39;type&#39; => [7, 8, 9]], [&#39;id&#39; => [1, 2, 3]]

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[[not]]:

//SQL:`NOT (attribute IS NULL)`  
$cond = [&#39;not&#39;, [&#39;attribute&#39; => null]]

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[[between]]: not between has the same usage

//SQL:`id BETWEEN 1 AND 10`  
$cond = [&#39;between&#39;, &#39;id&#39;, 1, 10]

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[[in]]: not in has the same usage

//SQL:`id IN (1, 2, 3)`  
$cond = [&#39;in&#39;, &#39;id&#39;, [1, 2, 3]] or $cond = [&#39;id&#39;=>[1, 2, 3]]

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//IN条件也适用于多字段  
$cond = [&#39;in&#39;, [&#39;id&#39;, &#39;name&#39;], [[&#39;id&#39; => 1, &#39;name&#39; => &#39;foo&#39;], [&#39;id&#39; => 2, &#39;name&#39; => &#39;bar&#39;]]]  
//也适用于内嵌sql语句  
$cond = [&#39;in&#39;, &#39;user_id&#39;, (new Query())->select(&#39;id&#39;)->from(&#39;users&#39;)->where([&#39;active&#39; => 1])]

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[[like]]:

//SQL:`name LIKE &#39;%tester%&#39;`
$cond = [&#39;like&#39;, &#39;name&#39;, &#39;tester&#39;]
//SQL:`name LIKE &#39;%test%&#39; AND name LIKE &#39;%sample%&#39;`
$cond = [&#39;like&#39;, &#39;name&#39;, [&#39;test&#39;, &#39;sample&#39;]]
//SQL:`name LIKE &#39;%tester&#39;`
$cond = [&#39;like&#39;, &#39;name&#39;, &#39;%tester&#39;, false]

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[[exists]]: not exists usage is similar to

//SQL:EXISTS (SELECT "id" FROM "users" WHERE "active"=1)
$cond = [&#39;exists&#39;, (new Query())->select(&#39;id&#39;)->from(&#39;users&#39;)->where([&#39;active&#39; => 1])]

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In addition, you can specify any operator as follows:

//SQL:`id >= 10`
$cond = [&#39;>=&#39;, &#39;id&#39;, 10] 
//SQL:`id != 10`
$cond = [&#39;!=&#39;, &#39;id&#39;, 10]

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