使用预处理语句获取多行数据

Question

使用预处理语句获取多行数据

5

我对预处理语句还比较陌生，不确定自己是否做得正确。

这是我的尝试：

$currgame = 310791;

$sql = "SELECT fk_player_id, player_tiles, player_draws, player_turn, player_passes, swapped FROM ".$prefix."_gameplayer WHERE fk_game_id = ?";
$stmt = $mysqli->stmt_init();

$data = array();
if($stmt->prepare($sql)){
    $stmt->bind_param('i', $currgame);
    $stmt->execute();

    $fk_player_id = null; $player_tiles = null; $player_draws = null; $player_turn = null; $player_passes = null; $swapped = null;
    $stmt->bind_result($fk_player_id, $player_tiles, $player_draws, $player_turn, $player_passes, $swapped);

    $res = $stmt->get_result();
    
    while ($row = $res->fetch_assoc()){
        $data[] = $row;
    }
    $stmt->close(); 
}

// to display own games
foreach ($data as $row) {
    if ($row['fk_player_id'] == $playerid) {
        
        $udraws = $row['player_draws']+1; 
        $upass = $row['player_passes'];
        $uswaps = $row['swapped'];
        
        echo 'uDraws: '.$udraws.'<br>';
        echo 'uPass: '.$upass.'<br>';
        echo 'uSwaps: '.$uswaps.'<br><br>';
    }
}
// to display other games
foreach ($data as $row) {
    if ($row['fk_player_id'] != $playerid) {
        
        $opponent = $row['fk_player_id'];
        $oppTiles = $row['player_tiles'];
        
        $odraws = $row['player_draws']+1;
        $opass = $row['player_passes'];
        $oswaps = $row['swapped'];
        
        echo 'oID: '.$opponent.'<br>';
        echo 'oTiles: '.$oppTiles.'<br>';
        
        echo 'oDraws: '.$odraws.'<br>';
        echo 'oPass: '.$opass.'<br>';
        echo 'oSwaps: '.$oswaps.'<br><br>';

    }
}

当我尝试运行以下代码时，出现了"ServerError"错误： $res = $stmt->get_result(); 造成了这个错误，但我不确定原因。

PHP致命错误：在第61行/home/mypage/public_html/TEST/preparedstatement.php中调用未定义的mysqli_stmt :: get_result()方法

- Mansa

请详细说明“ServerError”。有没有迹象表明错误来自哪里（MySQL、Apache、PHP）？是否有异常的HTTP状态码？完整的错误消息是什么？ - Oswald

3个回答

-2

while (mysqli_stmt_fetch($stmt)) {
        printf ("%s (%s)\n", $name, $code);
    }

这可能会对你有帮助：

http://php.net/manual/en/mysqli-stmt.fetch.php

- user2534211

1

请对您的代码进行解释，以便更清楚地了解它正在做什么以及如何帮助提问者解决问题。 - Bobulous

-2

由于我在您的代码中没有看到它，请确保在尝试查询之前实例化mysqli对象：

$mysqli = new mysqli("127.0.0.1", "user", "password", "mydb"); 
if($mysqli->connect_error){
    die("$mysqli->connect_errno: $mysqli->connect_error");
}

此外，ServerError 一定会在您的日志中显示，并指向正确的方向。

- AlienWebguy

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- EM-Creations · Accepted Answer

根据您的PHP/MySQL设置，您可能无法使用get_result()函数。

解决此问题的方法是绑定结果。

例如：

$stmt->execute();

$fk_player_id = null; $player_tiles = null; $player_draws = null; $player_turn = null; $player_passes = null; $swapped = null;

$stmt->bind_result($fk_player_id, $player_tiles, $player_draws, $player_turn, $player_passes, $swapped);

while ($stmt->fetch()) { // For each row
    /* You can then use the variables declared above, which will have the 
    new values from the query every time $stmt->execute() is ran.*/
}

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