mysql存储过程 在动态SQL内获取返回值的方法详解
2019/6/30 18:45:22
本文主要是介绍mysql存储过程 在动态SQL内获取返回值的方法详解,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
MySql通用分页存储过程
过程参数
p_cloumns varchar(500),p_tables varchar(100),p_where varchar(4000),p_order varchar(100),p_pageindex int,p_pagesize int,out p_recordcount int,out p_pagecount int
$:begin
declare v_sqlcounts varchar(4000);
declare v_sqlselect varchar(4000);
#拼接查询总记录的SQL语句
set v_sqlcounts = concat('select count(*) into @recordcount from ',p_tables,p_where);
#select v_sqlcounts;leave $;
set @sqlcounts = v_sqlcounts;
prepare stmt from @sqlcounts;
execute stmt;
deallocate prepare stmt;
#获取动态SQL语句返回值
set p_recordcount = @recordcount;
#根据总记录跳数计算出总页数
set p_pagecount = ceiling((p_recordcount+0.0)/p_pagesize);
if p_pageindex <1 then
set p_pageindex = 1;
elseif p_pageindex > p_pagecount and p_pagecount <> 0 then
set p_pageindex = p_pagecount;
end if;
#拼接分页查询记录的动态SQL语句
set v_sqlselect = concat('select ',p_cloumns,' from ',p_tables,p_where,if(p_order is not null,p_order,''),' limit ',(p_pageindex-1)*p_pagesize,' , ',p_pagesize);
#select v_sqlselect;leave $;
set @sqlselect = v_sqlselect;
prepare stmtselect from @sqlselect;
execute stmtselect;
deallocate prepare stmtselect;
end $
#拼接查询总记录的SQL语句
set v_sqlcounts = concat('select count(*) into @recordcount from ',v_tables,v_where);
set @sqlcounts := v_sqlcounts;
#预处理动态SQL
prepare stmt from @sqlcounts;
#传递动态SQL内参数
set @s1= categoryid;
execute stmt using @s1;
deallocate prepare stmt;
#获取动态SQL语句返回值
set recordcount = @recordcount;
#拼接查询总记录的SQL语句
set v_sqlcounts = concat('select count(*) into @recordcount from ',v_tables,v_where);
set @sqlcounts := v_sqlcounts;
#预处理动态SQL
prepare stmt from @sqlcounts;
#传递动态SQL内参数
set @s1= categoryid; execute stmt using @s1; deallocate prepare stmt;
#获取动态SQL语句返回值
set recordcount = @recordcount;
以上我上再做存储过程分页里用到动态SQL里将查询到的count记录条数通过变量@recordcount放到recordcount里面了。
mysql的IF ELSE和其他数据库的判断有点不一样,简单的判断语句如下。
#根据总记录跳数计算出总页数
set pagecount = ceiling((recordcount+0.0)/pagesize);
if pageindex <1 then
set pageindex = 1;
elseif pageindex > pagecount then
set pageindex = pagecount;
else
select pageindex,pagecount;
end if;
#根据总记录跳数计算出总页数 set pagecount = ceiling((recordcount+0.0)/pagesize); if pageindex <1 then set pageindex = 1; elseif pageindex > pagecount then set pageindex = pagecount; else select pageindex,pagecount; end if;
过程参数
复制代码 代码如下:
p_cloumns varchar(500),p_tables varchar(100),p_where varchar(4000),p_order varchar(100),p_pageindex int,p_pagesize int,out p_recordcount int,out p_pagecount int
$:begin
declare v_sqlcounts varchar(4000);
declare v_sqlselect varchar(4000);
#拼接查询总记录的SQL语句
set v_sqlcounts = concat('select count(*) into @recordcount from ',p_tables,p_where);
#select v_sqlcounts;leave $;
set @sqlcounts = v_sqlcounts;
prepare stmt from @sqlcounts;
execute stmt;
deallocate prepare stmt;
#获取动态SQL语句返回值
set p_recordcount = @recordcount;
#根据总记录跳数计算出总页数
set p_pagecount = ceiling((p_recordcount+0.0)/p_pagesize);
if p_pageindex <1 then
set p_pageindex = 1;
elseif p_pageindex > p_pagecount and p_pagecount <> 0 then
set p_pageindex = p_pagecount;
end if;
#拼接分页查询记录的动态SQL语句
set v_sqlselect = concat('select ',p_cloumns,' from ',p_tables,p_where,if(p_order is not null,p_order,''),' limit ',(p_pageindex-1)*p_pagesize,' , ',p_pagesize);
#select v_sqlselect;leave $;
set @sqlselect = v_sqlselect;
prepare stmtselect from @sqlselect;
execute stmtselect;
deallocate prepare stmtselect;
end $
复制代码 代码如下:
#拼接查询总记录的SQL语句
set v_sqlcounts = concat('select count(*) into @recordcount from ',v_tables,v_where);
set @sqlcounts := v_sqlcounts;
#预处理动态SQL
prepare stmt from @sqlcounts;
#传递动态SQL内参数
set @s1= categoryid;
execute stmt using @s1;
deallocate prepare stmt;
#获取动态SQL语句返回值
set recordcount = @recordcount;
#拼接查询总记录的SQL语句
set v_sqlcounts = concat('select count(*) into @recordcount from ',v_tables,v_where);
set @sqlcounts := v_sqlcounts;
#预处理动态SQL
prepare stmt from @sqlcounts;
#传递动态SQL内参数
set @s1= categoryid; execute stmt using @s1; deallocate prepare stmt;
#获取动态SQL语句返回值
set recordcount = @recordcount;
以上我上再做存储过程分页里用到动态SQL里将查询到的count记录条数通过变量@recordcount放到recordcount里面了。
mysql的IF ELSE和其他数据库的判断有点不一样,简单的判断语句如下。
复制代码 代码如下:
#根据总记录跳数计算出总页数
set pagecount = ceiling((recordcount+0.0)/pagesize);
if pageindex <1 then
set pageindex = 1;
elseif pageindex > pagecount then
set pageindex = pagecount;
else
select pageindex,pagecount;
end if;
#根据总记录跳数计算出总页数 set pagecount = ceiling((recordcount+0.0)/pagesize); if pageindex <1 then set pageindex = 1; elseif pageindex > pagecount then set pageindex = pagecount; else select pageindex,pagecount; end if;
这篇关于mysql存储过程 在动态SQL内获取返回值的方法详解的文章就介绍到这儿,希望我们推荐的文章对大家有所帮助,也希望大家多多支持为之网!
- 2024-04-26MySQL查出时间比实际晚8小时的解决方案
- 2024-04-01JPA不识别MySQL的枚举类型
- 2024-03-30mysql数据库表卡死解决方法
- 2024-03-15MySQL多数据源笔记5-ShardingJDBC实战
- 2024-03-11natural join mysql
- 2024-03-11关于VS2017,VS2015 中利用 EF使用Mysql 不显示数据源问题解决方案
- 2024-02-26mysql 阿里云xb后缀备份文件恢复-icode9专业技术文章分享
- 2024-02-22docker mysql 5.7
- 2024-02-18从 20 多套 MySQL 到 1 套 TiDB丨骏伯网络综合运营管理平台应用实践
- 2024-02-07mysql 外键索引入门介绍,为什么工作中很少有人使用?