上一篇：Yii2.0数据库查询应用实例（一）
findOne()和findAll()
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| // 查询key值为10的客户
$customer = Customer::findOne(10);
$customer = Customer::find()->where(['id' => 10])->one();
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| // 查询年龄为30，状态值为1的客户
$customer = Customer::findOne(['age' => 30, 'status' => 1]);
$customer = Customer::find()->where(['age' => 30, 'status' => 1])->one();
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| // 查询key值为10的所有客户
$customers = Customer::findAll(10);
$customers = Customer::find()->where(['id' => 10])->all();
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| // 查询key值为10，11,12的客户
$customers = Customer::findAll([10, 11, 12]);
$customers = Customer::find()->where(['id' => [10, 11, 12]])->all();
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| // 查询年龄为30，状态值为1的所有客户
$customers = Customer::findAll(['age' => 30, 'status' => 1]);
$customers = Customer::find()->where(['age' => 30, 'status' => 1])->all();
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where()条件
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| $customers = Customer::find()->where($cond)->all();
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$cond写法举例：
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| // SQL: (type = 1) AND (status = 2).
$cond = ['type' => 1, 'status' => 2]
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| // SQL:(id IN (1, 2, 3)) AND (status = 2)
$cond = ['id' => [1, 2, 3], 'status' => 2]
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| //SQL:status IS NULL
$cond = ['status' => null]
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[[and ]]:将不同的条件组合在一起，用法举例：
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| //SQL:`id=1 AND id=2`
$cond = ['and', 'id=1', 'id=2']
//SQL:`type=1 AND (id=1 OR id=2)`
$cond = ['and', 'type=1', ['or', 'id=1', 'id=2']]
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[[or]]:
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| //SQL:`(type IN (7, 8, 9) OR (id IN (1, 2, 3)))`
$cond = ['or', ['type' => [7, 8, 9]], ['id' => [1, 2, 3]]
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[[not]]:
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| //SQL:`NOT (attribute IS NULL)`
$cond = ['not', ['attribute' => null]]
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[[between ]]: not between 用法相同
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| //SQL:`id BETWEEN 1 AND 10`
$cond = ['between', 'id', 1, 10]
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[[in]]: not in 用法类似
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| //SQL:`id IN (1, 2, 3)`
$cond = ['in', 'id', [1, 2, 3]]
//IN条件也适用于多字段
$cond = ['in', ['id', 'name'], [['id' => 1, 'name' => 'foo'], ['id' => 2, 'name' => 'bar']]]
//也适用于内嵌sql语句
$cond = ['in', 'user_id', (new Query())->select('id')->from('users')->where(['active' => 1])]
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[[like]]:
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| //SQL:`name LIKE '%tester%'`
$cond = ['like', 'name', 'tester']
//SQL:`name LIKE '%test%' AND name LIKE '%sample%'`
$cond = ['like', 'name', ['test', 'sample']]
//SQL:`name LIKE '%tester'`
$cond = ['like', 'name', '%tester', false]
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[[exists]]: not exists用法类似
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| //SQL:EXISTS (SELECT "id" FROM "users" WHERE "active"=1)
$cond = ['exists', (new Query())->select('id')->from('users')->where(['active' => 1])]
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此外，您可以指定任意运算符如下
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| //SQL:`id >= 10`
$cond = ['>=', 'id', 10]
//SQL:`id != 10`
$cond = ['!=', 'id', 10]
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