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                # Coroutine\MySQL->prepare 向`MySQL`服務器發送`SQL`預處理請求。`prepare`必須與`execute`配合使用。預處理請求成功后,調用`execute`方法向`MySQL`服務器發送數據參數。 ```php function Coroutine\MySQL->prepare(string $sql, float $timeout) : bool ``` > 需要`2.0.11`或更高版本 參數 ---- * `$sql` 預處理語句,使用`?`作為參數占位符 * `$timeout` 超時時間 返回值 ---- * 失敗返回`false`,可檢查`$db->error`和`$db->errno`判斷錯誤原因 * 成功返回`Coroutine\MySQL\Statement`對象,可調用對象的`execute`方法發送參數 示例 ---- ```php use Swoole\Coroutine as co; co::create(function() { $db = new co\MySQL(); $server = array( 'host' => '127.0.0.1', 'user' => 'root', 'password' => 'root', 'database' => 'test', ); $ret1 = $db->connect($server); $stmt = $db->prepare('SELECT * FROM userinfo WHERE id=?'); if ($stmt == false) { var_dump($db->errno, $db->error); } else { $ret2 = $stmt->execute(array(10)); var_dump($ret2); } }); ```
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