如何使用存储过程获得两个表的总数？

Question

I need to create a stored procedure for getting the count of two table by using where clause condition, but when i try to create procedure it shows error 

Query : CREATE PROCEDURE bcp.getTotalCount BEGIN -- Create two integer values DECLARE @tableOneCount int, @tableTwoCount int -- Get ... 
Error Code : 1064 
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'BEGIN 
    -- Create two integer values 
    DECLARE @tableOneCount int, @tableTwoCount' at line 2 

这是存储过程我试图创建

DELIMITER $$ 

DROP PROCEDURE IF EXISTS bcp.getTotalCount $$ 
CREATE PROCEDURE bcp.getTotalCount 
BEGIN 
    -- Create two integer values 
    DECLARE @tableOneCount INT, @tableTwoCount INT 

    -- Get the number of rows from the first table 
    SELECT @tableOneCount = (SELECT COUNT(*) FROM candidates WHERE active=1) 
    SELECT @tableTwoCount = (SELECT COUNT(*) FROM voters_enrollment WHERE active=1) 

    -- Return the sum of the two table sizes 
    SELECT TotalCount = @tableOneCount + @tableTwoCount 
END $$ 

DELIMITER ; 

为了更好的理解我试图用简单的SQL查询这样

SELECT (SELECT COUNT(*) FROM candidates WHERE active=1)+ 
     (SELECT COUNT(*) FROM voters_enrollment WHERE active=1) AS Total 

我得到的结果作为

Total 
10 

像这样我需要创建过程并调用它来获得相同的结果通过使用简单的sql查询。任何人都可以帮助我解决这个问题。

Answer 1

您必须在创建语句后放置AS。

DELIMITER $$ 

    DROP PROCEDURE IF EXISTS bcp.getTotalCount $$ 
    CREATE PROCEDURE bcp.getTotalCount 

    AS 

    BEGIN 

    -- Create two integer values 
    DECLARE @tableOneCount INT, @tableTwoCount INT 

    -- Get the number of rows from the first table 
    SELECT @tableOneCount = (SELECT COUNT(*) FROM candidates WHERE active=1) 
    SELECT @tableTwoCount = (SELECT COUNT(*) FROM voters_enrollment WHERE active=1) 

    -- Return the sum of the two table sizes 
    SELECT TotalCount = @tableOneCount + @tableTwoCount 
END $$ 

DELIMITER ; 

Answer 2

你可以试试这个，队友：

DELIMITER $$ 
DROP PROCEDURE IF EXISTS bcp_getTotalCount $$ 
CREATE PROCEDURE bcp_getTotalCount() 
BEGIN 
    -- clear/initialize session variables 
    SET 
     @tableOneCount = 0, 
     @tableTwoCount = 0; 
    START TRANSACTION; 
    -- get record count from the source tables 
     SELECT COUNT(*) INTO @tableOneCount FROM candidates WHERE active = 1; 
     SELECT COUNT(*) INTO @tableOneCount FROM voters_enrollment WHERE active = 1; 
    -- return the sum of the two table sizes 
     SELECT TotalCount = @tableOneCount + @tableTwoCount; 
    COMMIT; 
END $$ 
DELIMITER ; 

MySQL的交易，原子性