Question

我想执行此功能。但它有错误说

ERROR：

语法错误在＆＃34;：=＆＃34;

第7行：选择结果：= MAX（path_history_id）作为路径INTO结果来自......

在这个函数中我想：

执行select with (MAX)，它将从表中返回最大ID;
捕获该值（它是一个整数值）;
将该值放入最后一个选择查询条件。

我无法在postgresql中找到一种方法来做到这一点。

CREATE OR REPLACE FUNCTION memcache(IN starting_point_p1 character varying, IN ending_point_p1 character varying)

RETURNS TABLE(path integer, movement_id_out integer, object_id_fk_out integer, path_history_id_fk_out integer, walking_distance_out real, angel_out real, direction_out character varying, time_stamp_out timestamp without time zone, x_coordinate_out real, y_coordinate_out real, z_coordinate_out real) AS
$BODY$
    DECLARE result int;
    BEGIN

    select result:=MAX(path_history_id)as path INTO result from path_history_info where starting_point=starting_point_p1 and ending_point =ending_point_p1 and achieve='1';
    return query
    select * from movement_info where path_history_id_fk=result;    
    END;
    $BODY$
  LANGUAGE plpgsql

Answer 1

语法错误

您的函数内的第一个查询需要更改如下：

select MAX(path_history_id)as path INTO result 
  from path_history_info 
    where starting_point=starting_point_p1 
     and ending_point =ending_point_p1 and achieve='1';

单个查询

您实际上并不需要存储过程。单个查询可以获得相同的结果。

select * from movement_info where path_history_id_fk = 
 (SELECT MAX(path_history_id) FROM path_history_info 
    where starting_point=starting_point_p1 
     and ending_point =ending_point_p1 and achieve='1';

在postgresql函数中捕获select查询返回值并使用它

1 个答案: