DECLARE cur1 CURSOR FOR SELECT id,name,dept_id FROM teacher; DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=false; open cur1; fetch cur1 into v_id,v_name,v_dept_id;whiledonedoselectv_id,v_name,v_dept_id;select'row---'abc; fetch cur1 into v_id,v_name,v_dept_id; endwhile; ...
DELIMITER // CREATE PROCEDURE `proc_CURSOR` (OUT param1 INT) BEGIN DECLARE a, b, c INT; DECLARE cur1 CURSOR FOR SELECT col1 FROM table1; DECLARE CONTINUE HANDLER FOR NOT FOUND SET b = 1; OPEN cur1; SET b = 0; SET c = 0; WHILE b = 0 DO FETCH cur1 INTO a; IF b = 0 ...
DECLARE done INT DEFAULTtrue; DECLARE v_name varchar(64); DECLARE v_idint; DECLARE v_dept_idint; DECLARE cur1 CURSOR FORSELECT id,name FROM teacherwhere id>=2;DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=false; open cur1;whiledonedofetch cur1 into v_id,v_name;selectv_id,v_name;...
DECLARE cur CURSOR FOR SELECT name FROM employees; -- 声明NOT FOUND处理程序,当游标中没有更多行时,将done设置为1 DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1; -- 打开游标 OPEN cur; -- 循环遍历游标中的所有行 read_loop: LOOP FETCH cur INTO emp_name; -- 检查是否还有更多的行 IF ...
DECLAREcurCURSORFORSELECTid,name,age,genderFROMusers;DECLARECONTINUEHANDLERFORNOTFOUNDSETdone=TRUE;DECLAREdoneBOOLEANDEFAULTFALSE;DECLAREuserIdINT;DECLAREuserNameVARCHAR(50);DECLAREuserAgeINT;DECLAREuserGenderVARCHAR(10);OPENcur;read_loop:LOOPFETCHcurINTOuserId,userName,userAge,userGender;IFdoneTHENLEAVEread_...
DECLARE v_a int DEFAULT 0; /*创建游标结束标志变量*/ DECLARE v_done1 int DEFAULT FALSE; /*创建游标*/ DECLARE cur_test1 CURSOR FOR SELECT a FROM test2; /*设置游标结束时v_done1的值为true,可以v_done1来判断游标cur_test1是否结束 了*/ ...
DECLARE cur_score CURSOR FOR SELECT stu_id,grade FROM score; 2.2 打开游标 打开游标的语法如下: OPEN cursor_name 当我们定义好游标之后,如果想要使用游标,必须先打开游标。打开游标的时候 SELECT 语句的查询结果集就会送到游标工作区,为后面游标的逐条读取结果集中的记录做准备. open cur_score; 2.3 使用...
DECLARE cursor_name CURSOR FOR SELECT column1, column2, ... FROM table_name WHERE condition; 打开游标:使用OPEN关键字打开游标,并指定要从中检索数据的查询。 OPEN cursor_name; 获取数据:使用FETCH关键字从游标中获取数据。可以使用FETCH NEXT、FETCH PRIOR、FETCH FIRST、FETCH LAST等关键字来获取不同位置的...
在MySQL中,可以使用游标和LOOP循环来遍历结果集。以下是一个示例: DELIMITER // DROP PROCEDURE IF EXISTS iterate_results// CREATE PROCEDURE iterate_results() BEGIN DECLARE done INT DEFAULT FALSE; DECLARE id INT; DECLARE name VARCHAR(255); DECLARE cur CURSOR FOR SELECT id, name FROM your_table; ...
CREATEPROCEDUREPROC1()BEGIN--定义两个存放结果的变量DECLARENAMEVARCHAR(20);DECLAREADDRVARCHAR(50);--声明游标DECLAREMYCURSORFORSELECT姓名,地址FROMcustomers;--打开游标OPENMY;--获取结果FETCHMYINTONAME,ADDR;--这里是为了显示获取结果SELECTNAME,ADDR;--关闭游标CLOSEMY;END; ...