create table `tb_system_category` (
`id` int(11) not null auto_increment,
`c_parent_id` int(11) not null,
`c_name` varchar(50) not null,
`c_full_name` varchar(200) default null,
`c_code` varchar(50) not null,
`c_describe` text,
primary key (`id`)
) engine=innodb auto_increment=123 default charset=utf8;
`id` int(11) not null auto_increment,
`c_name` varchar(255) not null,
`c_package_name` varchar(255) not null,
`c_category_code` varchar(50) not null default '0',
primary key (`id`)
) engine=innodb auto_increment=138583 default charset=utf8;
筆者先是使用sql聯表語句進行查詢，不外乎left join等語句的使用，結果發現執行速度巨慢無比，遂轉成儲存過程實現，儲存過程**如下所示：
begin
declare crand varchar(50) default rand();
-- 建立臨時表
create temporary table if not exists tb_system_temp_wac(
id integer,
c_name varchar(255),
c_package_name varchar(255),
c_category_code varchar(50),
categoryname varchar(255),
crand varchar(50)
); call generatecategoryname(crand);
-- 返回結果
set @mysql = concat('select * from tb_system_temp_wac where crand=\'',crand,'\'');
prepare stmt from @mysql;
execute stmt;
endbegin
declare sqlstr varchar(4000);
if ctype = 'count' then
else
end if;
if length(cname) > 0 then
set sqlstr = concat(sqlstr,'and c_name like \'%',cname,'%\' ');
end if;
if length(pname) > 0 then
set sqlstr = concat(sqlstr,'and c_package_name like \'%',pname,'%\' ');
end if;
if cid > 0 then
set sqlstr = concat(sqlstr,'and id=',cid,' ');
end if;
if length(ccategorycodes) > 0 then
set sqlstr = concat(sqlstr,'and c_category_code in(',ccategorycodes,') ');
end if;
if ctype != 'count' then
set sqlstr = concat('insert into tb_system_temp_wac(id,c_name,c_package_name,c_category_code,categoryname,crand) ',sqlstr,'limit ',startrow,',',pagesize);
end if;
set @mysql = sqlstr;
prepare stmt from @mysql;
execute stmt;
end
create procedure generatecategoryname(in c_rand varchar(50))
begin
declare finished integer default 0;
declare thiscategoryname varchar(20);
declare cur cursor for select categoryname from tb_system_temp_wac where crand = c_rand;
declare continue handler for not found set finished = 1;
open cur;
fetch cur into thiscategoryname;
while finished = 0 do
set @mysql = concat('update tb_system_temp_wac set categoryname=(select c_full_name from tb_system_category where c_code=\'',thiscategoryname,'\' limit 0,1) where c_category_code=\'',thiscategoryname,'\' and crand=\'',c_rand,'\'');
prepare stmt from @mysql;
execute stmt;
fetch cur into thiscategoryname;
end while;
end
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