mysqli::use_result

定義和用法

use_result() / mysqli_use_result()函數啟動從上次執行的查詢中檢索結果集。

實例

例子1 - 面向對像風格

啟動從上次執行的查詢中檢索結果集：

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

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

$sql = "SELECT Lastname FROM Persons ORDER BY LastName;" ;
$sql .= "SELECT Country FROM Customers" ;

// 執行多查詢
if ( $mysqli -> multi_query ( $sql ) ) {
  do {
    // 存儲第一個結果集
    if ( $result = $mysqli -> use_result ( ) ) {
      while ( $row = $result -> fetch_row ( ) ) {
        printf ( "%s\n" , $row [ 0 ] ) ;
      }
     $result -> close ( ) ;
    }
    // 如果有更多的結果集，則打印分隔符
    if ( $mysqli -> more_results ( ) ) {
      printf ( "-------------\n" ) ;
    }
     // 準備下一個結果集
  } while ( $mysqli -> next_result ( ) ) ;
}

$mysqli -> close ( ) ;
?>

例子2 - 過程式風格

啟動從上次執行的查詢中檢索結果集：

 <?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 ( ) ;
}

$sql = "SELECT Lastname FROM Persons ORDER BY LastName;" ;
$sql .= "SELECT Country FROM Customers" ;

// 執行多查詢
if ( mysqli_multi_query ( $con , $sql ) ) {
  do {
    // 存儲第一個結果集
    if ( $result = mysqli_use_result ( $con ) ) {
      while ( $row = mysqli_fetch_row ( $result ) ) {
        printf ( "%s\n" , $row [ 0 ] ) ;
      }
      mysqli_free_result ( $result ) ;
    }
    // 如果有更多的結果集，則打印分隔符
    if ( mysqli_more_results ( $con ) ) {
      printf ( "-------------\n" ) ;
    }
     // 準備下一個結果集
  } while ( mysqli_next_result ( $con ) ) ;
}

mysqli_close ( $con ) ;
?>