标签:
- public $enableCsrfValidation = false;
- 1.sql语句
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- $db=\Yii::$app->db ->createCommand("select * from 表名") ->queryAll();
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- $db=\Yii::$app->db ->createCommand()->update(‘表名‘,[‘字段名‘=>要修改的值],‘条件‘) ->execute();
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- $db=\Yii::$app->db ->createCommand() ->delete(‘表名‘,‘条件‘) ->execute();
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- $db=\Yii::$app->db ->createCommand() ->insert(‘表名‘,[‘字段名‘=>要添加的值],‘条件‘) ->execute();
//应用实例
Customer::find()->one(); 此方法返回一条数据;
Customer::find()->all(); 此方法返回所有数据;
Customer::find()->count(); 此方法返回记录的数量;
Customer::find()->average(); 此方法返回指定列的平均值;
Customer::find()->min(); 此方法返回指定列的最小值 ;
Customer::find()->max(); 此方法返回指定列的最大值 ;
Customer::find()->scalar(); 此方法返回值的第一行第一列的查询结果;
Customer::find()->column(); 此方法返回查询结果中的第一列的值;
Customer::find()->exists(); 此方法返回一个值指示是否包含查询结果的数据行;
Customer::find()->asArray()->one(); 以数组形式返回一条数据;
Customer::find()->asArray()->all(); 以数组形式返回所有数据;
Customer::find()->where($condition)->asArray()->one(); 根据条件以数组形式返回一条数据;
Customer::find()->where($condition)->asArray()->all(); 根据条件以数组形式返回所有数据;
Customer::find()->where($condition)->asArray()->orderBy(‘id DESC‘)->all(); 根据条件以数组形式返回所有数据,并根据ID倒序;
3.关联查询
ActiveRecord::hasOne():返回对应关系的单条记录
- ActiveRecord::hasMany():返回对应关系的多条记录
应用实例
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- Class CustomerModel extends yiidbActiveRecord
- {
- ...
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- public function getOrders()
- {
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- return $this->hasMany(OrdersModel::className(), [‘id‘=>‘order_id‘]);
- }
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- public function getCountry()
- {
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- return $this->hasOne(CountrysModel::className(), [‘id‘=>‘Country_id‘]);
- }
- ....
- }
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- CustomerModel::find()->with(‘orders‘, ‘country‘)->all();
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- CustomerModel::find()->with(‘orders.address‘)->all();
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- CustomerModel::find()->with([
- ‘orders‘ => function ($query) {
- $query->andWhere(‘status = 1‘);
- },
- ‘country‘,
- ])->all();
注:with中的orders对应getOrders
常见问题:
1.在查询时加了->select();如下,要加上order_id,即关联的字段(比如:order_id)比如要在select中,否则会报错:undefined index order_id
- CustomerModel::find()->select(‘order_id‘)->with(‘orders‘, ‘country‘)->all();
findOne()和findAll():
- $customer = Customer::findOne(10);
- $customer = Customer::find()->where([‘id‘ => 10])->one();
- $customer = Customer::findOne([‘age‘ => 30, ‘status‘ => 1]);
- $customer = Customer::find()->where([‘age‘ => 30, ‘status‘ => 1])->one();
- $customers = Customer::findAll(10);
- $customers = Customer::find()->where([‘id‘ => 10])->all();
- $customers = Customer::findAll([10, 11, 12]);
- $customers = Customer::find()->where([‘id‘ => [10, 11, 12]])->all();
- $customers = Customer::findAll([‘age‘ => 30, ‘status‘ => 1]);
- $customers = Customer::find()->where([‘age‘ => 30, ‘status‘ => 1])->all();
where()条件:
$customers = Customer::find()->where($cond)->all();
$cond写法举例:
- $cond = [‘type‘ => 1, ‘status‘ => 2]
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- $cond = [‘id‘ => [1, 2, 3], ‘status‘ => 2]
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- $cond = [‘status‘ => null]
[[and]]:将不同的条件组合在一起,用法举例:
- $cond = [‘and‘, ‘id=1‘, ‘id=2‘]
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- $cond = [‘and‘, ‘type=1‘, [‘or‘, ‘id=1‘, ‘id=2‘]]
[[or]]:
- $cond = [‘or‘, [‘type‘ => [7, 8, 9]], [‘id‘ => [1, 2, 3]]
[[not]]:
- $cond = [‘not‘, [‘attribute‘ => null]]
[[between]]: not between 用法相同
- $cond = [‘between‘, ‘id‘, 1, 10]
[[in]]: not in 用法类似
- $cond = [‘in‘, ‘id‘, [1, 2, 3]]
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- $cond = [‘in‘, [‘id‘, ‘name‘], [[‘id‘ => 1, ‘name‘ => ‘foo‘], [‘id‘ => 2, ‘name‘ => ‘bar‘]]]
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- $cond = [‘in‘, ‘user_id‘, (new Query())->select(‘id‘)->from(‘users‘)->where([‘active‘ => 1])]
[[like]]:
- $cond = [‘like‘, ‘name‘, ‘tester‘]
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- $cond = [‘like‘, ‘name‘, [‘test‘, ‘sample‘]]
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- $cond = [‘like‘, ‘name‘, ‘%tester‘, false]
[[exists]]: not exists用法类似
- $cond = [‘exists‘, (new Query())->select(‘id‘)->from(‘users‘)->where([‘active‘ => 1])]
此外,您可以指定任意运算符如下
- $cond = [‘>=‘, ‘id‘, 10]
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- $cond = [‘!=‘, ‘id‘, 10]
常用查询:
- p; User::find()->select(‘*‘)->where([‘>=‘, ‘admin_id‘, 10])->offset(0)->limit(10)->all()
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- $subQuery = (new Query())->select(‘COUNT(*)‘)->from(‘user‘);
- $query = (new Query())->select([‘id‘, ‘count‘ => $subQuery])->from(‘post‘);
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- User::find()->select(‘user_id‘)->distinct();
更新:
- $model->update($runValidation , $attributeNames);
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- Customer::updateAll([‘status‘ => 1], ‘status = 2‘);
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- Customer::updateAll([‘status‘ => 1], [‘status‘=> ‘2‘,‘uid‘=>‘1‘]);
删除:
- $model = Customer::findOne($id);
- $model->delete();
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- $model->deleteAll([‘id‘=>1]);
批量插入:
- Yii::$app->db->createCommand()->batchInsert(UserModel::tableName(), [‘user_id‘,‘username‘], [
- [‘1‘,‘test1‘],
- [‘2‘,‘test2‘],
- [‘3‘,‘test3‘],
- ])->execute();
查看执行sql
- $query = UserModel::find()->where([‘status‘=>1]);
- echo $query->createCommand()->getRawSql();
yii2.0增删改查
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原文地址:http://www.cnblogs.com/liangzia/p/5937378.html