通用分页存储过程（小易版本）

Posted 2022-04-02 wxm0827

USE [LH_Kes]
GO
/****** Object: StoredProcedure [dbo].[ProcCustomPage] Script Date: 07/10/2019 17:47:53 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

ALTER PROCEDURE [dbo].[ProcCustomPage]
(
@TableName nvarchar(100), --要分页显示的表名
@KeyFields nvarchar(1000), --用于定位记录的主键(惟一键)字段,可以是逗号分隔的多个字段
@PageIndex int=1, --要显示的页码
@PageSize int=20, --每页的大小(记录数)
@ShowFields nvarchar(1000)=‘‘, --以逗号分隔的要显示的字段列表,如果不指定,则显示所有字段
@OrderFields nvarchar(1000)=‘‘, --以逗号分隔的排序字段列表,可以指定在字段后面指定DESC/ASC
@WhereString nvarchar(4000)=‘‘, --查询条件,不要加WHERE
@RecordCount int OUTPUT --总页数
)
AS
SET NOCOUNT ON

--分页字段检查
IF ISNULL(@KeyFields,N‘‘)=‘‘
BEGIN
RAISERROR(N‘分页处理需要主键（或者惟一键）‘,1,16)
RETURN
END

--其他参数检查及规范
IF ISNULL(@PageIndex,0)<1 SET @PageIndex=1
IF ISNULL(@PageSize,0)<1 SET @PageSize=10
IF ISNULL(@ShowFields,N‘‘)=N‘‘ SET @ShowFields=N‘*‘
IF ISNULL(@OrderFields,N‘‘)=N‘‘
SET @OrderFields=N‘‘
ELSE
SET @OrderFields=N‘ORDER BY ‘+LTRIM(@OrderFields)
IF ISNULL(@WhereString,N‘‘)=N‘‘
SET @WhereString=N‘‘
ELSE
SET @WhereString=N‘WHERE (‘[email protected]+N‘)‘

--如果@RecordCount为NULL值,则计算总页数(这样设计可以只在第一次计算总页数,以后调用时,把总页数传回给存储过程,避免再次计算总页数,对于不想计算总页数的处理而言,可以给@RecordCount赋值)
IF @RecordCount IS NULL
BEGIN
DECLARE @sql nvarchar(4000)
SET @sql=N‘SELECT @RecordCount=COUNT(*)‘
+N‘ FROM ‘[email protected]
+N‘ ‘[email protected]
EXEC sp_executesql @sql,N‘@RecordCount int OUTPUT‘,@RecordCount OUTPUT
END

--计算分页显示的TOPN值
DECLARE @TopN varchar(20),@TopN1 varchar(20)
SELECT @[email protected],
@TopN1=(@PageIndex-1)*@PageSize

--第一页直接显示
IF @PageIndex=1
EXEC(N‘SELECT TOP ‘[email protected]
+N‘ ‘[email protected]
+N‘ FROM ‘[email protected]
+N‘ ‘[email protected]
+N‘ ‘[email protected])
ELSE
BEGIN
--处理别名
IF @ShowFields=N‘*‘
SET @ShowFields=N‘a.*‘

--生成主键(惟一键)处理条件
DECLARE @Where1 nvarchar(4000),@Where2 nvarchar(4000),
@s nvarchar(1000),@Field sysname
SELECT @Where1=N‘‘,@Where2=N‘‘,@[email protected]
WHILE CHARINDEX(N‘,‘,@s)>0
SELECT @Field=LEFT(@s,CHARINDEX(N‘,‘,@s)-1),
@s=STUFF(@s,1,CHARINDEX(N‘,‘,@s),N‘‘),
@[email protected]+N‘ AND a.‘[email protected]+N‘=b.‘[email protected],
@[email protected]+N‘ AND b.‘[email protected]+N‘ IS NULL‘,
@WhereString=REPLACE(@WhereString,@Field,N‘a.‘[email protected]),
@OrderFields=REPLACE(@OrderFields,@Field,N‘a.‘[email protected]),
@ShowFields=REPLACE(@ShowFields,@Field,N‘a.‘[email protected])
SELECT @WhereString=REPLACE(@WhereString,@s,N‘a.‘[email protected]),
@OrderFields=REPLACE(@OrderFields,@s,N‘a.‘[email protected]),
@ShowFields=REPLACE(@ShowFields,@s,N‘a.‘[email protected]),
@Where1=STUFF(@Where1+N‘ AND a.‘[email protected]+N‘=b.‘[email protected],1,5,N‘‘),
@Where2=CASE
WHEN @WhereString=‘‘ THEN N‘WHERE (‘
ELSE @WhereString+N‘ AND (‘
END+N‘b.‘[email protected]+N‘ IS NULL‘[email protected]+N‘)‘

--执行查询
EXEC(N‘SELECT TOP ‘[email protected]
+N‘ ‘[email protected]
+N‘ FROM ‘[email protected]
+N‘ a LEFT JOIN(SELECT TOP ‘[email protected]
+N‘ ‘[email protected]
+N‘ FROM ‘[email protected]
+N‘ a ‘[email protected]
+N‘ ‘[email protected]
+N‘)b ON ‘[email protected]
+N‘ ‘[email protected]
+N‘ ‘[email protected])
END