问题描述

详情

我想利用 mysql 的空间扩展，所以我尝试使用 bindParam 将经度和纬度存储在数据类型为 POINT 的 mysql 表中.不幸的是，我不断收到错误 SQLSTATE[23000]:违反完整性约束:1048 列位置"不能为空.

I'd like to make use of mysql's spatial extension, so I am trying to store longitude and latitude in a mysql table of datatype POINT using bindParam. Unfortunately, I keep getting the error SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'location' cannot be null.

我已经检查过经度和纬度是否有值.所以问题必须出在我的代码上，但我看不出我做错了什么.

I've checked that longitude and latitude have values. So the problem has to be with my code, but I cannot see what I am doing wrong.

这是我正在使用的代码.

Here is the code I am using.

$location=$latitude." ".$longitude;
$sql = "INSERT INTO my_geodata SET location = PointFromText('POINT(:location)')";
      //INSERT INTO my_geodata SET location = PointFromText('POINT(-41 12)');    

try 
{
    $stmt = $dbh->prepare($sql);            
    $stmt->bindParam(':location', $location, PDO::PARAM_STR);           
    $stmt->execute();   
    $dbh = null;
}

catch(PDOException $e)
{               
    echo $error=$e->getMessage();
}

问题

我做错了什么?如何使用 PDO 和 bindParam 将经度和纬度插入到 mysql 表(使用 POINT 数据类型)中?

What am I doing wrong? How can I insert longitude and latitude into a mysql table (that uses POINT datatype) with PDO and bindParam?

变化

根据 AgreeOrNot 的回答，实现这一目标的一种稍微不同的方法是

Based on AgreeOrNot's answer, a slightly different way to achieve this is

$location = 'POINT(' . $latitude . " " . $longitude . ')';    
$sql = "INSERT INTO my_geodata (location) VALUES (PointFromText(:location))";

推荐答案

请注意，参数化查询不是(简单的)字符串替换.在您的代码中，您的查询参数被放在一个字符串文字中，该文字将保持不变.

Note that parameterizing queries is not (simple) string replacement. In your code your query parameter is put in a string literal which will be kept untouched.

试试这个:

$location = 'POINT(' . $latitude . " " . $longitude . ')';
$sql = "INSERT INTO my_geodata SET location = PointFromText(:location)";

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