存储过程双游标

CREATE PROCEDURE 存储过程名称()
BEGIN
	DECLARE column 数据类型 DEFAULT 默认值;
	DECLARE column1 数据类型 DEFAULT 默认值;

	DECLARE sum INT DEFAULT 0;
	DECLARE count INT DEFAULT 0;
	DECLARE done INT DEFAULT 0;
	DECLARE cur1 CURSOR FOR (SELECT * FROM a );
	DECLARE cur2 CURSOR FOR (SELECT * FROM b);
	DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET done = null;
	SELECT count(*) FROM b INTO count;
	OPEN cur1;
		FETCH cur1 INTO culumn[,column1,column2];
		WHILE (done IS NOT NULL) DO
					IF count > 0 THEN
							OPEN cur2;
							#赋值给全局变量
							FETCH cur2 INTO culumn[,column1,column2];
							WHILE (sum < count)DO
							
							#业务逻辑
							
								#赋值给全局变量
								FETCH cur2 INTO culumn[,column1,column2];
								SET sum = sum+1;
							END WHILE;
							SET done = 0;
							SET sum = 0;
							CLOSE cur2;
				END IF;	
			FETCH cur1 INTO culumn[,column1,column2];
			END WHILE;
		CLOSE cur1;
	END