mysql 存储过程执行多条sql_MySQL - 存储过程动态执行 sql

存储过程动态执行 sql

--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;

emample

drop database if exists wifi_database;

create database wifi_database default character set utf8;

use wifi_database;

create table wifi_table(

rowid varchar(255),

id varchar(255),

NAME varchar(255),

BSSID varchar(255),

LEVEL varchar(255),

SSID varchar(255)

)DEFAULT CHARSET=utf8;

charset utf8;

load data infile 'c:/wifi_data.csv'

into table wifi_table character set utf8

fields terminated by ',' optionally enclosed by '"' escaped by '"'

lines terminated by '\r\n';

-- -- 单条测试

-- select * from (

-- -- union all：不删除重复；union：删除重复

-- select 'NAME','BSSID','LEVEL','SSID' union all

-- -- 外面套一层select * from，不然order by会被union弄失效了

-- select * from (select NAME,BSSID,LEVEL,SSID from wifi_table where NAME = '(1,0)' order by SSID) tbl_order

-- ) tbl_add_title

-- into outfile 'c:/wifi/1_0.txt'

-- fields terminated by ',' optionally enclosed by '' escaped by ''

-- lines terminated by '\r\n';

-- 定义结束符为 $$

delimiter $$

-- 删除 已有的 存储过程

drop procedure if exists wifi_table_to_file;

-- 创建新的存储过程

create procedure wifi_table_to_file()

begin

-- 变量声明

declare v_sql varchar(500);-- 需要执行的SQL语句

declare i int;-- 1,2

declare j int;-- 0-79

-- 循环体

set i = 1;

while i <= 2 do

set j = 0;

while j <= 79 do

set v_sql= concat('select * from (select \'NAME\',\'BSSID\',\'LEVEL\',\'SSID\' union all select * from (select NAME,BSSID,LEVEL,SSID from wifi_table where NAME = \'(',i,',',j,')\' order by SSID) tbl_order) tbl_add_title into outfile \'c:/wifi/',i,'_',j,'.txt\' fields terminated by \',\' optionally enclosed by \'\' escaped by \'\' lines terminated by \'\\r\\n\';');

-- 预处理需要执行的动态SQL，其中stmt是一个变量

set @v_sql_for_stmt=v_sql;

prepare stmt from @v_sql_for_stmt;

-- 执行SQL语句

EXECUTE stmt;

-- 释放掉预处理段

deallocate prepare stmt;

set j = j +1;

end while;

set i = i +1;

end while;

end $$

-- 先把结束符 回复为;

delimiter ;

call wifi_table_to_file();