Yii2 uses database operation summary (add, delete, check and modify, transactions)

This article mainly introduces the summary of database operations using Yii2 (add, delete, check and modify, transactions). It has a certain reference value. Now I share it with you. Friends in need can refer to it.

This article introduces Yii2——Use database operation summary (add, delete, query, transaction), as follows:

Object operation

Query

//1.简单查询 
$admin=Admin::model()->findAll($condition,$params); 
$admin=Admin::model()->findAll("username=:name",array(":name"=>$username)); 
  
$infoArr= NewsList::model()->findAll("status = '1' ORDER BY id DESC limit 10 "); 
  
//2. findAllByPk(该方法是根据主键查询一个集合,可以使用多个主键) 
$admin=Admin::model()->findAllByPk($postIDs,$condition,$params); 
$admin=Admin::model()->findAllByPk($id,"name like :name and age=:age",array(':name'=>$name,'age'=>$age)); 
$admin=Admin::model()->findAllByPk(array(1,2)); 
  
//3.findAllByAttributes (该方法是根据条件查询一个集合,可以是多个条件,把条件放到数组里面) 
$admin=Admin::model()->findAllByAttributes($attributes,$condition,$params); 
$admin=Admin::model()->findAllByAttributes(array('username'=>'admin')); 
  
//4.findAllBySql (该方法是根据SQL语句查询一个数组) 
$admin=Admin::model()->findAllBySql($sql,$params); 
$admin=Admin::model()->findAllBySql("select * from admin where username like :name",array(':name'=>'%ad%')); 
User::find()->all();  此方法返回所有数据； 
User::findOne($id);  此方法返回 主键 id=1 的一条数据(举个例子)；  
User::find()->where(['name' => '小伙儿'])->one();  此方法返回 ['name' => '小伙儿'] 的一条数据； 
User::find()->where(['name' => '小伙儿'])->all();  此方法返回 ['name' => '小伙儿'] 的所有数据； 
User::find()->orderBy('id DESC')->all();  此方法是排序查询； 
User::findBySql('SELECT * FROM user')->all(); 此方法是用 sql 语句查询 user 表里面的所有数据； 
User::findBySql('SELECT * FROM user')->one(); 此方法是用 sql 语句查询 user 表里面的一条数据； 
User::find()->andWhere(['sex' => '男', 'age' => '24'])->count('id');  统计符合条件的总条数； 
User::find()->one();  此方法返回一条数据； 
User::find()->all();  此方法返回所有数据； 
User::find()->count();  此方法返回记录的数量； 
User::find()->average();  此方法返回指定列的平均值； 
User::find()->min();  此方法返回指定列的最小值 ； 
User::find()->max();  此方法返回指定列的最大值 ； 
User::find()->scalar();  此方法返回值的第一行第一列的查询结果； 
User::find()->column();  此方法返回查询结果中的第一列的值； 
User::find()->exists();  此方法返回一个值指示是否包含查询结果的数据行； 
User::find()->batch(10); 每次取 10 条数据  
User::find()->each(10); 每次取 10 条数据， 迭代查询 
二、查询对象的方法 
//根据主键查询出一个对象,如：findByPk(1); 
$admin=Admin::model()->findByPk($postID,$condition,$params); 
$admin=Admin::model()->findByPk(1); 
  
//根据一个条件查询出一组数据,可能是多个,但是他只返回第一行数据 
$row=Admin::model()->find($condition,$params); 
$row=Admin::model()->find('username=:name',array(':name'=>'admin')); 
  
//该方法是根据条件查询一组数据,可以是多个条件,把条件放到数组里面,查询的也是第一条数据 
$admin=Admin::model()->findByAttributes($attributes,$condition,$params); 
$admin=Admin::model()->findByAttributes(array('username'=>'admin')); 
  
//该方法是根据SQL语句查询一组数据,他查询的也是第一条数据 
$admin=Admin::model()->findBySql($sql,$params); 
$admin=Admin::model()->findBySql("select * from admin where username=:name",array(':name'=>'admin')); 
  
//拼一个获得SQL的方法,在根据find查询出一个对象  
$criteria=newCDbCriteria;  
$criteria->select='username';// only select the 'title' column  
$criteria->condition='username=:username';  //请注意,这是一个查询的条件,且只有一个查询条件.多条件用addCondition 
$criteria->params=array(":username=>'admin'"); 
$criteria->order ="id DESC"; 
$criteria->limit ="3"; 
$post=Post::model()->find($criteria);// $params isnot needed  
  
//多条件查询的语句 
$criteria= new CDbCriteria;    
$criteria->addCondition("id=1");//查询条件，即where id = 1  
$criteria->addInCondition('id',array(1,2,3,4,5));//代表where id IN (1,2,3,4,5,);  
$criteria->addNotInCondition('id',array(1,2,3,4,5));//与上面正好相法，是NOT IN  
$criteria->addCondition('id=1','OR');//这是OR条件，多个条件的时候，该条件是OR而非AND  
$criteria->addSearchCondition('name','分类');//搜索条件，其实代表了。。where name like '%分类%'  
$criteria->addBetweenCondition('id', 1, 4);//between 1 and 4 
$criteria->compare('id', 1);  //这个方法比较特殊,他会根据你的参数自动处理成addCondition或者addInCondition. 
$criteria->compare('id',array(1,2,3));  //即如果第二个参数是数组就会调用addInCondition  
  
  
$criteria->select ='id,parentid,name';//代表了要查询的字段，默认select='*';  
$criteria->join ='xxx'; //连接表  
$criteria->with ='xxx'; //调用relations  
$criteria->limit = 10;  //取1条数据，如果小于0，则不作处理  
$criteria->offset = 1; //两条合并起来，则表示 limit 10 offset 1,或者代表了。limit 1,10  
$criteria->order ='xxx DESC,XXX ASC' ;//排序条件  
$criteria->group ='group 条件';  
$criteria->having ='having 条件 ';  
$criteria->distinct = FALSE;//是否唯一查询 
三、查询个数,判断查询是否有结果 
//该方法是根据一个条件查询一个集合有多少条记录,返回一个int型数字 
$n=Post::model()->count($condition,$params); 
$n=Post::model()->count("username=:name",array(":name"=>$username)); 
  
//该方法是根据SQL语句查询一个集合有多少条记录,返回一个int型数字 
$n=Post::model()->countBySql($sql,$params); 
$n=Post::model()->countBySql("select * from admin where username=:name",array(':name'=>'admin')); 
  
//该方法是根据一个条件查询查询得到的数组有没有数据,如果有数据返回一个true,否则没有找到 
$exists=Post::model()->exists($condition,$params); 
$exists=Post::model()->exists("name=:name",array(":name"=>$username)); 
四、新增 
$admin= new Admin;     
$admin->username =$username; 
$admin->password =$password; 
if($admin->save() > 0){echo "添加成功"; }else{echo "添加失败"; } 
五、修改 
Post::model()->updateAll($attributes,$condition,$params); 
$count=Admin::model()->updateAll(array('username'=>'11111','password'=>'11111'),'password=:pass',array(':pass'=>'1111a1')); 
if($count> 0){ echo "修改成功"; }else{echo "修改失败"; } 
  
$rt= PostList::model()->updateAll(array('status'=>'1'),'staff_id=:staff AND host_id=:host',array(':staff'=>$staff_id,':host'=>$host_id)); 
  
//$pk主键,可以是一个也可以是一个集合,$attributes是要修改的字段的集合,$condition条件,$params传入的值 
Post::model()->updateByPk($pk,$attributes,$condition,$params); 
$count=Admin::model()->updateByPk(1,array('username'=>'admin','password'=>'admin')); 
$count=Admin::model()->updateByPk(array(1,2),array('username'=>'admin','password'=>'admin'),'username=:name',array(':name'=>'admin')); 
if($count>0){echo "修改成功"; }else{echo "修改失败"; } 
  
Post::model()->updateCounters($counters,$condition,$params); 
$count=Admin::model()->updateCounters(array('status'=>1),'username=:name',array(':name'=>'admin')); 
if($count> 0){ echo "修改成功"; }else{echo "修改失败"; } 
//array('status'=>1)代表数据库中的admin表根据条件username='admin',查询出的所有结果status字段都自加1 
六、删除 
//deleteAll 
Post::model()->deleteAll($condition,$params); 
$count= Admin::model()->deleteAll('username=:name and password=:pass',array(':name'=>'admin',':pass'=>'admin')); 
$count= Admin::model()->deleteAll('id in("1,2,3")');//删除id为这些的数据 
if($count>0){echo"删除成功"; }else{echo "删除失败"; } 
  
//deleteByPk 
Post::model()->deleteByPk($pk,$condition,$params); 
$count= Admin::model()->deleteByPk(1); 
$count=Admin::model()->deleteByPk(array(1,2),'username=:name',array(':name'=>'admin')); 
if($count>0){echo "删除成功"; }else{echo "删除失败"; }

Direct database operation

Query

//createCommand(执行原生的SQL语句) 
$sql= "SELECT u.account,i.* FROM sys_user as u left join user_info as i on u.id=i.user_id"; 
$rows=Yii::$app->db->createCommand($sql)->query(); 
foreach($rows as $k => $v){ 
  echo$v['add_time']; 
} 
 
查询返回多行： 
 
$command = $connection->createCommand('SELECT * FROM post'); 
$posts = $command->queryAll(); 
返回单行： 
 
$command = $connection->createCommand('SELECT * FROM post WHERE id=1'); 
$post = $command->queryOne(); 
查询多行单值： 
 
$command = $connection->createCommand('SELECT title FROM post'); 
$titles = $command->queryColumn(); 
查询标量值/计算值： 
 
$command = $connection->createCommand('SELECT COUNT(*) FROM post'); 
$postCount = $command->queryScalar();

Update

$command = $connection->createCommand('UPDATE post SET status=1 WHERE id=1'); 
$command->execute();

Insert Update Delete

// INSERT 
$connection->createCommand()->insert('user', [ 
  'name' => 'Sam', 
  'age' => 30, 
])->execute(); 
 
// INSERT 一次插入多行 
$connection->createCommand()->batchInsert('user', ['name', 'age'], [ 
  ['Tom', 30], 
  ['Jane', 20], 
  ['Linda', 25], 
])->execute(); 
 
// UPDATE 
$connection->createCommand()->update('user', ['status' => 1], 'age > 30')->execute(); 
 
// DELETE 
$connection->createCommand()->delete('user', 'status = 0')->execute();

Transaction

//事务的基本结构(多表更新插入操作请使用事务处理) 
$dbTrans= Yii::app()->db->beginTransaction(); 
try{ 
  $post= new Post; 
  $post->'title'= 'Hello dodobook!!!'; 
  if(!$post->save())throw newException("Error Processing Request", 1); 
  $dbTrans->commit(); 
// $this->_end(0,'添加成功!!!'); 
}catch(Exception$e){ 
  $dbTrans->rollback(); 
// $this->_end($e->getCode(),$e->getMessage());

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