mysql - 使用 MySQL 几何函数时出现 SQL 错误

Question

ALTER PROCEDURE dbo.StoredProcedure1    
AS  
DECLARE @Seedid int, @data1 float, @data2 float, @g geometry  

DECLARE member_cursor CURSOR FOR  
SELECT id from test1 ;  

OPEN member_cursor;  

FETCH NEXT FROM member_cursor  
INTO @Seedid ;  
WHILE @@FETCH_STATUS = 0  
BEGIN  
    select @data1 =data1 from test where id=@Seedid  
    select @data2 =data2 from test where id=@Seedid  
    update test1  
       set data4 = geometry::STGeomFromText('POINT (@data1 @data2)', 0)
        where id=@Seedid;  
    -- This is executed as long as the previous fetch succeeds.  
    FETCH NEXT FROM member_cursor  
    INTO @Seedid ;  
END  
RETURN  
CLOSE member_cursor;  
DEALLOCATE member_cursor;  

我收到以下错误:

The statement has been terminated.
A .NET Framework error occurred during execution of user-defined routine or aggregate "geometry":
System.FormatException: 24141: A number is expected at position 13 of the input. The input has @data1.

Answer 1

经过一番努力，我终于找到了解决这个问题的方法。如果其他人再次遇到此类问题，请发布解决方案。在 Geometry 中，当我传递 @data1 和 @data2 时，它的那些变量只是 @data1 而不是它的 float 值。所以，我们可以做的是:

select @data1 =data1 from test1 where id=@Seedid  
select @data2 =data2 from test1 where id=@Seedid  
Set @POINTSTR = 'POINT(' + CAST(@data1 AS varchar(32)) + ' ' + CAST(@data2 AS varchar(32)) + ')';  
update test1  set data4 = geometry::STGeomFromText(@POINTSTR, 4326) where id=@Seedid;