mysqli::query

定義和用法

query() / mysqli_query()函數對數據庫執行查詢。

實例

例子1 - 面向對像風格

對數據庫執行查詢：

 <?php
$mysqli = new mysqli ( "localhost" , "my_user" , "my_password" , "my_db" ) ;

// 檢查連接
if ( $mysqli -> connect_errno ) {
  echo "Failed to connect to MySQL: " . $mysqli -> connect_error ;
  exit ( ) ;
}

// 執行查詢
if ( $result = $mysqli -> query ( "SELECT * FROM Persons" ) ) {
  echo "Returned rows are: " . $result -> num_rows ;
  // 釋放結果集
  $result -> free_result ( ) ;
}

$mysqli -> close ( ) ;
?>

例子2 - 過程式風格

對數據庫執行查詢：

 <?php
$con = mysqli_connect ( "localhost" , "my_user" , "my_password" , "my_db" ) ;

if ( mysqli_connect_errno ( ) ) {
  echo "Failed to connect to MySQL: " . mysqli_connect_error ( ) ;
  exit ( ) ;
}

// 執行查詢
if ( $result = mysqli_query ( $con , "SELECT * FROM Persons" ) ) {
  echo "Returned rows are: " . mysqli_num_rows ( $result ) ;
  // 釋放結果集
  mysqli_free_result ( $result ) ;
}

mysqli_close ( $con ) ;
?>