Question

我编写了一个函数来查找最接近提交时间戳的表中的时间戳。查询在Mysql中自行运行正常（通过phpmyadmin测试）。但是，当我通过php脚本执行它时，结果总是为NULL。

脚本和其他功能中的所有其他查询都正常工作。也没有错误。我必须遗漏一些但却看不到的东西。感谢您的任何帮助。

功能：

function GetClosestMatch($timestamps){
    global $mysqli;
    $closestmatch = array();
    foreach($timestamps as $timestamp){
        if($stmt1 = $mysqli->prepare("SELECT DISTINCT timestamp FROM winlog_data ORDER BY ABS(timestamp - ? ) LIMIT 1")){
            mysqli_stmt_bind_param($stmt1,"i", $timestamp);
            mysqli_stmt_execute($stmt1);
            mysqli_stmt_store_result($stmt1);
            mysqli_stmt_bind_result($stmt1, $db_timestamp);
            $closestmatch[] = $db_timestamp;
        }
    }
    return $closestmatch;
}

时间戳阵列：

array (size=12)
0 => int 1451602800
1 => int 1454281200
2 => int 1456786800
3 => int 1459461600
4 => int 1462053600
5 => int 1464732000
6 => int 1467324000
7 => int 1470002400
8 => int 1472680800
9 => int 1475272800
10 => int 1477954800
11 => int 1480546800

Closestmatch数组（来自函数的结果）

array (size=12)
0 => null
1 => null
2 => null
3 => null
4 => null
5 => null
6 => null
7 => null
8 => null
9 => null
10 => null
11 => null

在PHPmyadmin中查询结果：

SELECT DISTINCT timestamp FROM winlog_data ORDER BY ABS(timestamp - 1475272800 ) LIMIT 1 

timestamp  
1475271900

Answer 1

您错过了对mysqli_stmt_fetch的电话。

function GetClosestMatch($timestamps){
    global $mysqli;
    $closestmatch = array();
    foreach($timestamps as $timestamp){
        if($stmt1 = $mysqli->prepare("SELECT DISTINCT timestamp FROM winlog_data ORDER BY ABS(timestamp - ? ) LIMIT 1")){
            mysqli_stmt_bind_param($stmt1,"i", $timestamp);
            mysqli_stmt_execute($stmt1);
            mysqli_stmt_store_result($stmt1);
            mysqli_stmt_bind_result($stmt1, $db_timestamp);
            while (mysqli_stmt_fetch($stmt1)) {
                $closestmatch[] = $db_timestamp;                     
            }

        }
    }
    return $closestmatch;
}

此外，您正在混合和匹配过程和oop mysqli_ *调用。我建议你选择一种风格并坚持下去。（虽然与你的问题没有关系）

Mysql查询不能在PHP中工作，在mysql中工作正常

1 个答案: