实现mysql游标loop循环 一、流程概述 在mysql中,游标(cursor)是一种用于逐行处理查询结果的机制,通过游标可以实现对查询结果的循环操作。下面是实现mysql游标loop循环的步骤: 二、具体操作 1. 声明游标 AI检测代码解析 DECLAREcur_nameCURSORFORSELECT*FROMtable_name; 1. 在这里,cur_name为游标的名称,table_name为查...
1.游标从创建到关闭的过程: 注意class_id1 的属性刚开始由declare设置的默认是空,但在打开游标之前只要给它重新赋值就不为空了。 DECLARE cc_2 CURSOR FOR SELECT id FROM pms_teach_example_day where class_id=class_id1 AND id>=(SELECT id FROM pms_teach_example_day WHERE class_id=class_id1 AND ...
AI检测代码解析 DECLAREcurCURSORFORSELECTid,name,age,genderFROMusers;DECLARECONTINUEHANDLERFORNOTFOUNDSETdone=TRUE;DECLAREdoneBOOLEANDEFAULTFALSE;DECLAREuserIdINT;DECLAREuserNameVARCHAR(50);DECLAREuserAgeINT;DECLAREuserGenderVARCHAR(10);OPENcur;read_loop:LOOPFETCHcurINTOuserId,userName,userAge,userGender;IFdon...
参考示例:https://blog.csdn.net/xw1680/article/details/130119856 DELIMITER $$ DROP PROCEDURE IF EXISTS `sp_cursor_test3` $$ CREATE PROCEDURE `sp_cursor_tes
DECLAREcurCURSORFORSELECTid,dateFROMttorderbyidasc; //定义游标cur游标内容为SELECTidFROMttorderbyidasc DECLARECONTINUEHANDLERFORNOTFOUNDSETfig=1; //捕获异常 OPENcur; //打开游标 LOOP_LABLE:LOOP FETCHcurINTOid_value,date_value; //遍历游标每一行并将内容赋给id_value和date_value,id_value和date_valu...
student_cursor; -- 循环处理 read_loop: LOOP FETCH student_cursor INTO s_id, s_name; IF done THEN LEAVE read_loop; END IF; -- 为新生创建初始记录 INSERT INTO student_records (student_id, status) VALUES (s_id, 'active'); END LOOP; -- 关闭游标 CLOSE student_cursor; -- 提交事务 ...
DECLARE collect_email CURSOR FOR SELECT email FROM sakila.customer WHERE (address_id > 100 AND address_id < 200); DECLARE CONTINUE HANDLER FOR NOT FOUND SET terminate = TRUE; OPEN collect_email; getEmails: LOOP FETCH collect_email INTO emailAddr; ...
After that, inside the loop we used thev_finishedvariable to check if there is any email in the list to terminate the loop. Finally, we close the cursor using theCLOSEstatement: CLOSE email_cursor; Thebuild_email_liststored procedure is as follows: ...
server_recv_cursor_close_response() : MysqlRoutingXConnection server_recv_cursor_close_response_forward() : MysqlRoutingXConnection server_recv_cursor_close_response_forward_last() : MysqlRoutingXConnection server_recv_cursor_fetch_response() : MysqlRoutingXConnection server_recv_cursor_fetch_response_...
July 27, 2010 09:25AM Re: Loop in Loop with 2 Cursor 1899 Chad Bourque July 27, 2010 11:48AM Re: Loop in Loop with 2 Cursor 1513 Daniel Seeliger July 29, 2010 02:14AM Sorry, you can't reply to this topic. It has been closed....