bind_param 困难 [英] bind_param difficulties

问题描述

我遇到了问题，以下代码没有给我任何结果.但是，如果我取消注释指示的行，并注释掉 bind_param 行，它会起作用，但这不是违背了 mysqli 的目的吗?我的 var_dump 给了我的 string(1) "1"

I'm having problems the following code gives me no results. however if I uncomment out the indicated line, and comment out the bind_param line it works, but isn't that defeating the purpose of mysqli? my var_dump gives my string(1) "1"

function teams($mysqli, $league_id) {
    echo 'league id = ' . var_dump($league_id);
    $sql = "SELECT team_id, team_name FROM teams where league_id='?'";
//  $sql = "SELECT team_id, team_name FROM teams where league_id='".$league_id."'";
    $stmt = $mysqli->prepare($sql);
    $stmt->bind_param('i', $league_id);
    $stmt->execute();
    $stmt->bind_result($col1, $col2);  
    while($stmt->fetch()) {
        $results[] = array(  
            'team_id' => $col1,  
            'team_name' => $col2  
        );  
    }  
    $stmt->close();
    var_dump($results);
    return $results;
}

推荐答案

函数 bool mysqli_stmt::bind_param ( string $types , mixed &$var1 [, mixed &$... ] )

The function bool mysqli_stmt::bind_param ( string $types , mixed &$var1 [, mixed &$... ] )

接受以下$types

类型规范字符

人物描述

i 对应变量的类型为整数

d 对应变量的类型为 double

d corresponding variable has type double

对应的变量是字符串类型

s corresponding variable has type string

b 对应的变量是一个 blob，会分包发送

b corresponding variable is a blob and will be sent in packets

您将 $types 指定为 'i' 并在单引号中以字符串形式给出值.删除引号并尝试将 $league_id 转换为 int 值.

You are specifying the $types as 'i' and giving the value as string in single quotes. Remove the quotes and try to convert $league_id to int value.

http://php.net/manual/en/mysqli-stmt.bind-param.php

快乐编码！！

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