将值(如果存在)传递给另一个插入查询MySQL
我对mysql运行了以下查询:将值(如果存在)传递给另一个插入查询MySQL,mysql,Mysql,我对mysql运行了以下查询: DELIMITER $$ CREATE /*[DEFINER = { user | CURRENT_USER }]*/ PROCEDURE `mybook_store`.`myProc`() /*LANGUAGE SQL | [NOT] DETERMINISTIC | { CONTAINS SQL | NO SQL | READS SQL DATA | MODIFIES SQL DATA } | SQL SECUR
DELIMITER $$
CREATE
/*[DEFINER = { user | CURRENT_USER }]*/
PROCEDURE `mybook_store`.`myProc`()
/*LANGUAGE SQL
| [NOT] DETERMINISTIC
| { CONTAINS SQL | NO SQL | READS SQL DATA | MODIFIES SQL DATA }
| SQL SECURITY { DEFINER | INVOKER }
| COMMENT 'string'*/
BEGIN
DECLARE authId INT DEFAULT 0;
DECLARE
DECLARE CheckExists INT DEFAULT 0;
SET CheckExists = 0;
SELECT COUNT(*) INTO CheckExists FROM author WHERE fname = 'xxxx' AND surname='xxxx';
IF (CheckExists > 0) THEN
SELECT authorid INTO authId FROM author WHERE fname = 'xxxx' AND surname='xxxx';
ELSE
INSERT author(fname, surname) VALUES('xxxx', 'xxxx');
SET authId = LAST_INSERT_ID();
END IF;
END$$
DELIMITER ;
上面的查询将检查插入的作者是否存在于作者表中,如果不存在,它将插入它,如果存在,它将不插入。。。
我的问题是:
如果变量存在,我想得到fname和姓氏
插入到另一个查询中,如果插入到另一个表中,则需要
2个变量如何将其传递到查询?
我是否应该使用authorid(如果存在),然后选择fname和姓氏
那是属于authord的?
我可以声明参数而不是实际值“xxxx”吗?
感谢您的帮助很快,请尝试以下操作:
DELIMITER $$
CREATE PROCEDURE myProc (IN f_fname VARCHAR(25), IN f_surname VARCHAR(25))
BEGIN
DECLARE checkExists INT DEFAULT 0;
DECLARE authId INT DEFAULT 0;
SELECT COUNT(*) INTO checkExists FROM author WHERE fname = f_fname AND surname = f_surname;
IF(checkExists > 0) THEN
SELECT authorId into authId FROm author WHERE fname = f_fname AND surname = f_surname;
ELSE
INSERT INTO author(fname, surname) VALUES (f_fname, f_surname);
SET authId = LAST_INSERT_ID();
END IF;
END$$
DELIMITER ;