将值if exists传递给另一个插入查询MySQL

Question

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 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，它不会插入。。。我的问题：

1. 我想得到fname和姓氏，如果变量存在，那么在另一个查询中插入到另一个表中需要2个变量如何将其传递给查询
2. 如果存在，我应该使用授权人吗？然后选择名称和姓氏属于authorid的
3. 我可以声明参数而不是实际值"xxxx"吗

感谢您的帮助

Answer 1

你很接近，试试这个：

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 ;