MySQL 游标获取 NULL
MySQL cursor fetch NULL
为什么我的两个变量都输出 NULL
? SELECT
部分光标工作正常。
CREATE PROCEDURE p2()
BEGIN
# Account table
DECLARE accountid INT;
DECLARE accountname VARCHAR(1000);
# 1. cursor finished/done variable comes first
DECLARE done INT DEFAULT 0;
# 2. the curser declaration and select
DECLARE c_account_id_name CURSOR FOR SELECT
accountid,
accountname
FROM temp.test;
# 3. the continue handler is defined last
DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET done = TRUE;
OPEN c_account_id_name;
SET accountid = 0;
SET accountname = '';
read_loop: LOOP
FETCH c_account_id_name
INTO accountid, accountname;
IF done
THEN
LEAVE read_loop;
END IF;
SELECT accountname;
END LOOP;
END;
游标中的变量和 select 属性不能相同...这是一个 MySQL 错误。
这会起作用
DROP PROCEDURE IF EXISTS p2;
DELIMITER $$
CREATE PROCEDURE p2()
BEGIN
# Account table
DECLARE v_accountidsome INT; #pay attention
DECLARE v_accountnameelst VARCHAR(1000); #pay attention
# 1. cursor finished/done variable comes first
DECLARE v_done INT DEFAULT FALSE;
# 2. the cursor declaration and select
DECLARE c_account_id_name CURSOR FOR SELECT
accountid, #pay attention
accountname #pay attention
FROM temp.test;
# 3. the continue handler is defined last
DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET v_done = TRUE;
OPEN c_account_id_name;
read_loop: LOOP
FETCH c_account_id_name
INTO v_accountidsome, v_accountnameelst;
IF v_done
THEN
LEAVE read_loop;
END IF;
SELECT v_accountidsome;
SELECT v_accountnameelst;
END LOOP;
CLOSE c_account_id_name;
END $$
DELIMITER ;
CALL p2();
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为什么我的两个变量都输出 NULL
? SELECT
部分光标工作正常。
CREATE PROCEDURE p2()
BEGIN
# Account table
DECLARE accountid INT;
DECLARE accountname VARCHAR(1000);
# 1. cursor finished/done variable comes first
DECLARE done INT DEFAULT 0;
# 2. the curser declaration and select
DECLARE c_account_id_name CURSOR FOR SELECT
accountid,
accountname
FROM temp.test;
# 3. the continue handler is defined last
DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET done = TRUE;
OPEN c_account_id_name;
SET accountid = 0;
SET accountname = '';
read_loop: LOOP
FETCH c_account_id_name
INTO accountid, accountname;
IF done
THEN
LEAVE read_loop;
END IF;
SELECT accountname;
END LOOP;
END;
游标中的变量和 select 属性不能相同...这是一个 MySQL 错误。 这会起作用
DROP PROCEDURE IF EXISTS p2;
DELIMITER $$
CREATE PROCEDURE p2()
BEGIN
# Account table
DECLARE v_accountidsome INT; #pay attention
DECLARE v_accountnameelst VARCHAR(1000); #pay attention
# 1. cursor finished/done variable comes first
DECLARE v_done INT DEFAULT FALSE;
# 2. the cursor declaration and select
DECLARE c_account_id_name CURSOR FOR SELECT
accountid, #pay attention
accountname #pay attention
FROM temp.test;
# 3. the continue handler is defined last
DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET v_done = TRUE;
OPEN c_account_id_name;
read_loop: LOOP
FETCH c_account_id_name
INTO v_accountidsome, v_accountnameelst;
IF v_done
THEN
LEAVE read_loop;
END IF;
SELECT v_accountidsome;
SELECT v_accountnameelst;
END LOOP;
CLOSE c_account_id_name;
END $$
DELIMITER ;
CALL p2();
查找更多here