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                >[success] 先引入命名空間 `use sys\Pdo;` ## 查詢操作(查) 獲取 `users` 表的單個用戶信息。 ~~~ $stmt = Pdo::query( 'SELECT * FROM `users` WHERE uid = :uid', [ 'uid' => $uid, ] ); return $stmt->fetchObject(); ~~~ 獲取 `users` 表的所有信息。 ~~~ $stmt = Pdo::query('SELECT * FROM `users`'); return $stmt->fetchAll(); ~~~ >[info] query方法返回的結果集是一個 sys\pdo\Statement 類,與PHP的 PDOStatement 類的方法與屬性完全一至,你可以直接當做 PDOStatement 類來使用,PDOStatement 類的詳細文檔:http://php.net/manual/zh/class.pdostatement.php ## 寫入操作(增、刪、改) 插入一條用戶信息。 ~~~ $insertID = Pdo::execute( 'INSERT INTO `users`(`user_name`, `phone`, `credits`) VALUES(:user_name, :phone, :credits)', [ 'user_name' => '小華', 'phone' => '18600000000', 'credits' => 0, ] ); ~~~ >[info] execute方法會返回受影響的行數,如果是 insert 語句會返回 InsertID。 ## 返回一個包含結果集中所有行的數組 ~~~ $stmt = Pdo::query('SELECT * FROM `users`'); echo $stmt->fetchAll(); ~~~ > pdo.attribute 配置項可配置默認返回的是數組還是對象。 ## 從結果集中獲取下一行 ~~~ $stmt = Pdo::query('SELECT * FROM `users`'); echo $stmt->fetch(); ~~~ > pdo.attribute 配置項可配置默認返回的是數組還是對象。 ## 獲取下一行并作為一個對象返回 ~~~ $stmt = Pdo::query('SELECT * FROM `users`'); echo $stmt->fetchObject(); ~~~ ## 返回受上一個 `SQL` 語句影響的行數 ~~~ $stmt = Pdo::query('SELECT * FROM `users`'); echo $stmt->rowCount(); ~~~ ## 返回最后執行的 `SQL` 語句 ~~~ Pdo::query('SELECT * FROM `users`'); echo Pdo::getLastSql(); ~~~
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