How to query the database in yii1.1

yii1.1 Method of querying the database: First specify the database to be used through the statement "$dbh = Yii::app()->db;"; then use "$cmd->queryAll() ;" method can query and return all rows in the result.

Yii 1.1 Query and operate the database

Recommended: "yii tutorial》

Specify the database connection to use:

$dbh = Yii::app()->db;

Update operation:

$sql = "upadte user set locked=1 w.h.e.r.e uid=". $uid;
$cmd = $dbh->createCommand($sql);
$cmd->execute();

Other operations:

$rows = $cmd->queryAll();      // 查询并返回结果中的所有行
$row = $cmd->queryRow();       // 查询并返回结果中的第一行
$column = $cmd->queryColumn(); // 查询并返回结果中的第一列
$value = $cmd->queryScalar();  // 查询并返回结果中第一行的第一个字段

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