试图将现有查询转换为存储过程，gis答案

【问题标题】：Trying to convert existing query to a stored procedure, gis试图将现有查询转换为存储过程，gis
【发布时间】：2020-02-02 20:54:07
【问题描述】：

我正在尝试转换现有查询，该查询返回距点（几何）特定距离内的所有记录

我在 mysql-workbench 中创建了一个存储过程，它需要很长时间和距离，我希望得到与查询相同的结果（返回指定距离内的所有记录。我哪里出错了，我在试图将 lat 和 long 的值传递给另一个空间函数以创建用户位置。但这里似乎没有失败

CREATE DEFINER=`root`@`localhost` PROCEDURE `findNearby`(

IN lat VARCHAR(255),
IN longVal VARCHAR(255),
IN distanceFrom INT
)
BEGIN
DECLARE user_location geometry default ST_GeomFromText( 'POINT(0 0)', 4326 ) ;
SET user_location = ST_GeomFromText( 'POINT(lat longVal)', 4326 );
SELECT 
    *,
    ST_AsText(`location`) AS `pos_wkt`,
    ST_Distance_Sphere(`location`, user_location) AS `distance`
FROM
    `business_details`
WHERE ST_Distance_Sphere(`location`, user_location) <= distanceFrom;
END

SET @user_location = ST_GeomFromText( 'POINT(30 50)', 4326 );
  SELECT 
    *,
    ST_AsText(`location`) AS `pos_wkt`,
    ST_Distance_Sphere(`location`, @user_location) AS `distance`
FROM
    `business_details`
WHERE ST_Distance_Sphere(`location`, @user_location) <= (1000*5000);

3037 - 向函数 st_geomfromtext 提供的 GIS 数据无效。

【问题讨论】：

标签： mysql

【解决方案1】：

设法解决了这个问题。

CREATE DEFINER=`root`@`localhost` PROCEDURE `findNearby`(

IN lat VARCHAR(255),
IN longVal VARCHAR(255),
IN distanceFrom INT
)
BEGIN
DECLARE user_location geometry default ST_GeomFromText( 'POINT(0 0)', 4326 ) ;
DECLARE pointString varchar(255);
set pointString = concat('POINT(', lat, ' ', longVal, ')');
SET user_Location = ST_GeomFromText(  pointString, 4326 );
SELECT 
    *,
    ST_AsText(`location`) AS `pos_wkt`,
    ST_Distance_Sphere(`location`, user_location) AS `distance`
FROM
    `business_details`
WHERE ST_Distance_Sphere(`location`, user_location) <= distanceFrom * 1000;
END

【讨论】：