存储过程/函数可以返回表吗？

Question

MySql存储过程/函数可以在不使用临时表的情况下返回表吗？

创建以下过程

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

然后用它来调用它

CALL database.getExamples()

显示示例表 - 正如预期的那样 - 但以下似乎不可能:

SELECT * FROM CALL database.getExamples()

是否有可能从存储过程/函数返回查询结果表,如果是这样 - 如何？

Answer 1

至于现在,这是不可能的.

以下是该条款中可能使用的文档FROM:

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.

Answer 2

根据A.4 MySQL 5.6 FAQ:存储过程和函数:

A.4.14:MySQL 5.6存储例程能否返回结果集？

存储过程可以,但存储的功能不能.

Answer 3

看起来可以完成，但是需要使用存储过程的输出变量。 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