MySQL stored procedure instance

Source: Internet
Author: User

?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 --存储过程名和参数,参数中in表示传入参数,out标示传出参数,inout表示传入传出参数create procedure p_procedurecode(in sumdate varchar(10))   begin      declare v_sql varchar(500);    --需要执行的SQL语句      declare sym varchar(6);           declare var1 varchar(20);      declare var2 varchar(70);      declare var3 integer;     --定义游标遍历时,作为判断是否遍历完全部记录的标记      declare no_more_departments integer DEFAULT 0;          --定义游标名字为C_RESULT      DECLARE C_RESULT CURSOR FOR              SELECT barcode,barname,barnum FROM tmp_table;     --声明当游标遍历完全部记录后将标志变量置成某个值      DECLARE CONTINUE HANDLER FOR NOT FOUND              SET no_more_departments=1;     set sym=substring(sumdate,1,6);     --截取字符串,并将其赋值给一个遍历     --连接字符串构成完整SQL语句,动态SQL执行后的结果记录集,在MySQL中无法获取,因此需要转变思路将其放置到一个临时表中(注意代码中的写法)。一般写法如下:     --     ‘Create TEMPORARY Table   表名(Select的查询语句);      set v_sql= concat(‘Create TEMPORARY Table tmp_table(select aa as aacode,bb as aaname,count(cc) as ccnum from h‘,sym,‘ where substring(dd,1,8)=‘‘‘,sumdate,‘‘‘ group by aa,bb)‘);     set @v_sql=v_sql;   --注意很重要,将连成成的字符串赋值给一个变量(可以之前没有定义,但要以@开头)      prepare stmt from @v_sql;  --预处理需要执行的动态SQL,其中stmt是一个变量      EXECUTE stmt;      --执行SQL语句      deallocate prepare stmt;     --释放掉预处理段     OPEN C_RESULT;       --打开之前定义的游标      REPEAT                      --循环语句的关键词            FETCH C_RESULT INTO VAR1, VAR2, VAR3;   --取出每条记录并赋值给相关变量,注意顺序          --执行查询语句,并将获得的值付给一个变量 @oldaacode(注意如果以@开头的变量可以不用通过declare语句事先声明)            select @oldaacode:=vcaaCode from T_sum where vcaaCode=var1 and dtDate=sumdate;            if @oldaacode=var1 then--判断               update T_sum set iNum=var3 where vcaaCode=var1 and dtDate=sumdate;            else                insert into T_sum(vcaaCode,vcaaName,iNum,dtDate) values(var1,var2,var3,sumdate);            end if;      UNTIL no_more_departments  END REPEAT;    --循环语句结束      CLOSE C_RESULT;                            --关闭游标     DROP TEMPORARY TABLE tmp_table;       --删除临时表 end;

  

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.