在sql中,怎么把这个字段的值{"pageIndex":0,"pageSize":5} 变成"{""pageIndex"":0,""pageSize"":5}",可以用hivesql的形式写给我吗
时间: 2023-11-11 22:04:52 浏览: 169
在SQL中,可以使用REPLACE函数将字段值中的双引号替换为两个双引号,从而将{"pageIndex":0,"pageSize":5}变成"{""pageIndex"":0,""pageSize"":5}"。具体语句如下:
```
SELECT REPLACE('{"pageIndex":0,"pageSize":5}', '"', '""');
```
在HiveSQL中,语句如下:
```
SELECT regexp_replace('{"pageIndex":0,"pageSize":5}', '"', '""');
```
相关问题
帮我把这个JSON转换成Java实体类 {"refundNo":"","hotelName":"","supplierId":"","saleChannel":"","processState":"","createEndTime":"","createStartTime":"","pageIndex":1,"pageSize":10}
这是一个简单的 JSON 对象,它可以转换为一个 Java 实体类。
首先,需要使用一个工具(例如 Jackson)来解析 JSON 字符串。
在 Java 中,可以使用 ObjectMapper 类来解析 JSON 字符串。
然后,可以创建一个 Java 实体类,该类具有与 JSON 对象中的属性对应的字段。
例如,可以创建如下的 Java 实体类:
```
public class Refund {
private String refundNo;
private String hotelName;
private String supplierId;
private String saleChannel;
private String processState;
private String createEndTime;
private String createStartTime;
private int pageIndex;
private int pageSize;
// 其他代码,例如 getter 和 setter 方法
}
```
最后,可以使用以下代码将 JSON 字符串转换为 Java 对象:
```
ObjectMapper mapper = new ObjectMapper();
Refund refund = mapper.readValue(jsonString, Refund.class);
```
这样,就可以使用 Java 实体类来表示 JSON 对象了。
【简答题】 请阅读下面分页存储过程的代码,并且为每一行代码加上注释。 create procedure pagequery ( @sqlTable nvarchar(200), ----待查询表名 @sqlColumns nvarchar(500) , ----待显示字段 @sqlWhere nvarchar(1000) , ----查询条件,不需where @sqlSort nvarchar(500) , ----排序字段,不需order by @pageIndex int, ----当前页 @pageSize int, ----每页显示的记录数 @rowTotal int = 1 output ----返回总记录数 ) as begin set nocount on; -- 获取记录总数 declare @sqlcount nvarchar(1000) ; set @sqlcount = N' select @rowTotal=count(*) from '+@sqlTable +' where 1=1 '+ @sqlWhere; exec sp_executesql @sqlcount,N'@rowTotal int out ',@rowTotal out ; -- 返回数据查询 declare @sqldata nvarchar(1000) ; set @sqldata=' select '+ @sqlColumns + ' from (select *,Row_number() over(order by '+ @sqlSort +') as RN from '+ @sqlTable +' where 1=1 '+ @sqlWhere+') as TR where RN>'+ cast(@pageSize*@pageIndex as varchar(20))+' and RN<'+ cast((@pageSize*(@pageIndex+1)+1) as varchar(20)); exec sp_executesql @sqldata ; end --调用如下: declare @totalrow int; exec pagequery 'employee','*','','ID asc',1,10,@totalrow output; select @totalrow; 2)MySQL 版本 create procedure pagequery ( in sqlTable varchar(256), in sqlColumns varchar(512), in sqlWhere varchar(1024), in sqlSort varchar(512), in pageIndex int, in pageSize int, out rowTotal int ) begin declare start_row int default 0; set start_row = pageIndex* pageSize; -- 获取记录总数 set @sqlcount = concat('select count(*) into @rows_total from ', sqlTable, ' where 1=1 ', sqlWhere); prepare count_stmt from @sqlcount; execute count_stmt; deallocate prepare count_stmt; set rowTotal = @rows_total; -- 返回数据查询 set @sqldata = concat('select ', sqlColumns, ' from ', sqlTable, ' where 1=1 ', sqlWhere, ' order by ', sqlSort,' limit ', start_row, ',', pageSize); prepare main_stmt from @sqldata; execute main_stmt; deallocate prepare main_stmt; end --调用如下: call pagequery('emp
1)SQL Server 版本
```
create procedure pagequery
(
@sqlTable nvarchar(200), -- 待查询表名
@sqlColumns nvarchar(500) , -- 待显示字段
@sqlWhere nvarchar(1000) , -- 查询条件,不需where
@sqlSort nvarchar(500) , -- 排序字段,不需order by
@pageIndex int, -- 当前页
@pageSize int, -- 每页显示的记录数
@rowTotal int = 1 output -- 返回总记录数
)
as
begin
set nocount on; -- 不返回行数
-- 获取记录总数
declare @sqlcount nvarchar(1000);
set @sqlcount = N'select @rowTotal=count(*) from '+@sqlTable +' where 1=1 '+ @sqlWhere;
exec sp_executesql @sqlcount,N'@rowTotal int out ',@rowTotal out;
-- 返回数据查询
declare @sqldata nvarchar(1000);
set @sqldata='select '+ @sqlColumns + ' from (select *,Row_number() over(order by '+ @sqlSort +') as RN from '+ @sqlTable +' where 1=1 '+ @sqlWhere+') as TR where RN>'+ cast(@pageSize*@pageIndex as varchar(20))+' and RN<'+ cast((@pageSize*(@pageIndex+1)+1) as varchar(20));
exec sp_executesql @sqldata;
end
-- 调用如下:
declare @totalrow int;
exec pagequery 'employee','*','','ID asc',1,10,@totalrow output;
select @totalrow;
```
2)MySQL 版本
```
create procedure pagequery
(
in sqlTable varchar(256), -- 待查询表名
in sqlColumns varchar(512), -- 待显示字段
in sqlWhere varchar(1024), -- 查询条件,不需where
in sqlSort varchar(512), -- 排序字段,不需order by
in pageIndex int, -- 当前页
in pageSize int, -- 每页显示的记录数
out rowTotal int -- 返回总记录数
)
begin
declare start_row int default 0;
set start_row = pageIndex * pageSize;
-- 获取记录总数
set @sqlcount = concat('select count(*) into @rows_total from ', sqlTable, ' where 1=1 ', sqlWhere);
prepare count_stmt from @sqlcount;
execute count_stmt;
deallocate prepare count_stmt;
set rowTotal = @rows_total;
-- 返回数据查询
set @sqldata = concat('select ', sqlColumns, ' from ', sqlTable, ' where 1=1 ', sqlWhere, ' order by ', sqlSort,' limit ', start_row, ',', pageSize);
prepare main_stmt from @sqldata;
execute main_stmt;
deallocate prepare main_stmt;
end
-- 调用如下:
call pagequery('employee', '*', '', 'ID asc', 1, 10, @totalrow);
select @totalrow;
```
注释已经添加在代码中。
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