存储过程/函数可以返回表吗?

时间:2009-10-28 13:37:47

标签: sql mysql stored-procedures

MySql存储过程/函数可以在不使用临时表的情况下返回表吗?

创建以下程序

CREATE PROCEDURE database.getExamples() 
    SELECT * FROM examples;

然后用

调用它
CALL database.getExamples()

显示示例表 - 正如预期的那样 - 但似乎不可能出现以下情况:

SELECT * FROM CALL database.getExamples()

是否有可能从存储过程/函数返回查询结果表,如果是 - 如何?

5 个答案:

答案 0 :(得分:18)

至于现在,这是不可能的。

以下是FROM条款中可能使用的documentation

table_references:
    table_reference [, table_reference] ...

table_reference:
    table_factor
  | join_table

table_factor:
    tbl_name [[AS] alias] [index_hint)]
  | table_subquery [AS] alias
  | ( table_references )
  | { OJ table_reference LEFT OUTER JOIN table_reference
        ON conditional_expr }

join_table:
    table_reference [INNER | CROSS] JOIN table_factor [join_condition]
  | table_reference STRAIGHT_JOIN table_factor
  | table_reference STRAIGHT_JOIN table_factor ON conditional_expr
  | table_reference {LEFT|RIGHT} [OUTER] JOIN table_reference join_condition
  | table_reference NATURAL [{LEFT|RIGHT} [OUTER]] JOIN table_factor

join_condition:
    ON conditional_expr
  | USING (column_list)

index_hint:
    USE {INDEX|KEY} [FOR JOIN] (index_list)
  | IGNORE {INDEX|KEY} [FOR JOIN] (index_list)
  | FORCE {INDEX|KEY} [FOR JOIN] (index_list)

index_list:
    index_name [, index_name] ...

如您所见,存储过程不在此列表中。

答案 1 :(得分:10)

根据A.4 MySQL 5.6 FAQ: Stored Procedures and Functions

  

A.4.14: Can MySQL 5.6 stored routines return result sets?

     

存储过程可以,但存储的功能不能。

答案 2 :(得分:2)

看起来可以完成,但是使用存储过程中的输出变量。 http://www.sqlinfo.net/mysql/mysql_stored_procedure_SELECT.php

-- 1. Create Procedure
DROP PROCEDURE IF EXISTS `sp_students_SELECT_byPK` 
GO

CREATE PROCEDURE sp_students_SELECT_byPK
(
    IN   p_student_id                    INT(11)       , 
    OUT  p_password                      VARCHAR(15)   , 
    OUT  p_active_flg                    TINYINT(4)    , 
    OUT  p_lastname                      VARCHAR(30)   , 
    OUT  p_firstname                     VARCHAR(20)   , 
    OUT  p_gender_code                   VARCHAR(1)    , 
    OUT  p_birth_dttm                    DATETIME      
 )
BEGIN 

SELECT password                      , 
       active_flg                    , 
       lastname                      , 
       firstname                     , 
       gender_code                   , 
       birth_dttm                    
INTO   p_password                      , 
       p_active_flg                    , 
       p_lastname                      , 
       p_firstname                     , 
       p_gender_code                   , 
       p_birth_dttm                    
FROM   students
WHERE  student_id = p_student_id ; 

END 

GO

-- 2. Select Results from Stored Procedure
/***
IN    p_student_id   INT(11)
OUT   p_password     VARCHAR(15)
OUT   p_active_flg   TINYINT(4)
OUT   p_lastname     VARCHAR(30)
OUT   p_firstname    VARCHAR(20)
OUT   p_gender_code  VARCHAR(1)
OUT   p_birth_dttm   DATETIME
***/

CALL sp_students_SELECT_byPK
(
  8, 
  @p_password , 
  @p_active_flg , 
  @p_lastname , 
  @p_firstname , 
  @p_gender_code , 
  @p_birth_dttm
)
GO

SELECT @p_password      AS p_password      , 
   @p_active_flg    AS p_active_flg    , 
   @p_lastname      AS p_lastname      , 
   @p_firstname     AS p_firstname     , 
   @p_gender_code   AS p_gender_code   , 
   @p_birth_dttm    AS p_birth_dttm   
GO

答案 3 :(得分:1)

您可以使用视图而不是存储过程来执行您尝试的操作,但这完全取决于存储过程的作用。

如果使用临时表是您唯一的选择,请考虑使用MEMORY存储引擎。

答案 4 :(得分:1)

每个未插入表或变量的SELECT语句都将生成结果集。

如果希望存储过程只返回一个结果集,请确保只有一个SELECT语句。如果您有其他SELECT语句,请确保它们将结果插入表或变量中。

UPDATE 以下是存储过程的示例。

此存储过程将返回一个结果集:

DELIMITER ;;
CREATE DEFINER=CURRENT_USER PROCEDURE stored_procedure_name()
BEGIN
    DECLARE local_variable_name INT;

    SELECT column_name FROM table_1 LIMIT 1 INTO local_variable_name;

    SELECT * FROM table_1;
END;;
DELIMITER ;
This stored procedure would return two result sets:

DELIMITER ;;
CREATE DEFINER=CURRENT_USER PROCEDURE stored_procedure_name()
BEGIN
    DECLARE local_variable_name INT;

    SELECT column_name FROM table_1 LIMIT 1 INTO local_variable_name;

    SELECT * FROM table_1;

    SELECT * FROM table_2;
END;;
DELIMITER ;

价:https://dba.stackexchange.com/questions/8291/how-does-mysql-return-a-result-set-from-a-stored-procedure