1. Simple query:
]: 根据查询结果返回查询的第一条记录。 [[all()]]: 根据查询结果返回所有记录。 [[count()]]: 返回记录的数量。 [[sum()]]: 返回指定列的总数。 [[average()]]: 返回指定列的平均值。 [[min()]]: 返回指定列的最小值。 [[max()]]: 返回指定列的最大值。 [[scalar()]]: 返回查询结果的第一行中的第一列的值。 [[column()]]: 返回查询结果中的第一列的值。 [[exists()]]: 返回一个值，该值指示查询结果是否有数据。 [[where()]]: 添加查询条件 [[with()]]: 该查询应执行的关系列表。 [[indexBy()]]: 根据索引的列的名称查询结果。 [[asArray()]]: 以数组的形式返回每条记录。 [code=php]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；
2. Related query:
[[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[/code]
Application example:
);
}
public function getCountry()
{
//客户和国家是一对一的关系所以用hasOne
return $this->hasOne(CountrysModel::className(), ['id'=>'Country_id']);
}
....
}
// 查询客户与他们的订单和国家
CustomerModel::find()->with('orders', 'country')->all();
// 查询客户与他们的订单和订单的发货地址
CustomerModel::find()->with('orders.address')->all();
// 查询客户与他们的国家和状态为1的订单
CustomerModel::find()->with([
'orders' => function ($query) {
$query->andWhere('status = 1');
},
'country',
])->all();
：with中的orders对应getOrders
<b>常见问题：</b>
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
// 查询客户与他们的订单和国家
CustomerModel::find()->select('order_id')->with('orders', 'country')->all();)->one(); // 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(); // 查询key值为10的所有客户 $customers = Customer::findAll(10); $customers = Customer::find()->where(['id' => 10])->all(); // 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(); // 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(); <b>where()条件：</b> $customers = Customer::find()->where($cond)->all(); $cond写法举例： // SQL: (type = 1) AND (status = 2). $cond = ['type' => 1, 'status' => 2] // SQL:(id IN (1, 2, 3)) AND (status = 2) $cond = ['id' => [1, 2, 3], 'status' => 2] //SQL:status IS NULL $cond = ['status' => null] <b>[[]]</b>:将不同的条件组合在一起，用法举例： //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']]
[[or]]:
], ['id' => [1, 2, 3]] <b>[[]]:</b> //SQL:`NOT (attribute IS NULL)` $cond = ['not', ['attribute' => null]]
[[between]]: not between Same usage
<b>[[]]: </b>not in 用法类似 //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])]
[[like]]:
//SQL:`name LIKE '%test%' AND name LIKE '%sample%'` $cond = ['like', 'name', ['test', 'sample']] //SQL:`name LIKE '%tester'` $cond = ['like', 'name', '%tester', false] <b>[[]]: </b>not exists用法类似 //SQL:EXISTS (SELECT "id" FROM "users" WHERE "active"=1) $cond = ['exists', (new Query())->select('id')->from('users')->where(['active' => 1])]
Also, you can specify any operator as follows
//SQL:`id >= 10` $cond = ['>=', 'id', 10] //SQL:`id != 10` $cond = ['!=', 'id', 10]
Commonly used Query:
// WHERE admin_id >= 10 LIMIT 0,10 User::find()->select('*')->where(['>=', 'admin_id', 10])->offset(0)->limit(10)->all() // SELECT `id`, (SELECT COUNT(*) FROM `user`) AS `count` FROM `post` $subQuery = (new Query())->select('COUNT(*)')->from('user'); $query = (new Query())->select(['id', 'count' => $subQuery])->from('post'); // SELECT DISTINCT `user_id` ... User::find()->select('user_id')->distinct();
Update:
//update(); //runValidation boolen 是否通过validate()校验字段 默认为true //attributeNames array 需要更新的字段 $model->update($runValidation , $attributeNames); //updateAll(); //update customer set status = 1 where status = 2 Customer::updateAll(['status' => 1], 'status = 2'); //update customer set status = 1 where status = 2 and uid = 1; Customer::updateAll(['status' => 1], ['status'=> '2','uid'=>'1']);
Delete:
$model = Customer::findOne($id); $model->delete(); $model->deleteAll(['id'=>1]);
Batch insert:
Yii::$app->db->createCommand()->batchInsert(UserModel::tableName(), ['user_id','username'], [ ['1','test1'], ['2','test2'], ['3','test3'], ])->execute();
View execution sql
//UserModel $query = UserModel::find()->where(['status'=>1]); echo $query->createCommand()->getRawSql();
The above is the detailed explanation of the addition, deletion, modification and query of Yii2.0 database operations. For more related content, please pay attention to the PHP Chinese website (m.sbmmt.com)!