多表分页存储

Posted 2020-11-01 zchzt

--存储过程
CREATE PROCEDURE Pager
@TotalCount INT OUTPUT, --总记录数
@TotalPage INT OUTPUT, --总页数
@Table NVARCHAR(1000), --查询的表名（可多表，例如：Person p LEFT JOIN TE a ON a.PID=p.Id ）
@Column NVARCHAR(1000), --查询的字段，可多列或者为*
@OrderColumn NVARCHAR(100), --排序字段
@GroupColumn NVARCHAR(150), --分组字段
@PageSize INT, --每页记录数
@CurrentPage INT, --当前页数
@Group TINYINT, --是否使用分组，否是
@Condition NVARCHAR(4000) --查询条件（注意：若这时候为多表查询，这里也可以跟条件，例如：a.pid=2）
AS
DECLARE @PageCount   INT, --总页数
    @strSql    NVARCHAR(4000), --主查询语句
    @strTemp    NVARCHAR(2000), --临时变量
    @strCount   NVARCHAR(1000), --统计语句
    @strOrderType NVARCHAR(1000) --排序语句
BEGIN
SET @PageCount = @PageSize * (@CurrentPage -1)
SET @strOrderType = ‘ ORDER BY ‘ + @OrderColumn + ‘ ‘
IF @Condition != ‘‘
BEGIN
  IF @CurrentPage = 1
  BEGIN
    IF @GROUP = 1
    BEGIN
      SET @strCount = ‘SELECT @TotalCount=COUNT(*) FROM ‘ + @Table
        + ‘ WHERE ‘ + @Condition + ‘ GROUP BY ‘ + @GroupColumn
      SET @strCount = @strCount + ‘ SET @[email protected]@ROWCOUNT‘
      SET @strSql = ‘SELECT TOP ‘ + STR(@PageSize) + ‘ ‘ + @Column
        + ‘ FROM ‘ + @Table + ‘ WHERE ‘ + @Condition + 
        ‘ GROUP BY ‘ + @GroupColumn + ‘ ‘ + @strOrderType
    END
    ELSE
    BEGIN
      SET @strCount = ‘SELECT @TotalCount=COUNT(*) FROM ‘ + @Table
        + ‘ WHERE ‘ + @Condition
      SET @strSql = ‘SELECT TOP ‘ + STR(@PageSize) + ‘ ‘ + @Column
        + ‘ FROM ‘ + @Table + ‘ WHERE ‘ + @Condition + ‘ ‘ + @strOrderType
    END
  END
  ELSE
  BEGIN
    IF @GROUP = 1
    BEGIN
      SET @strCount = ‘SELECT @TotalCount=COUNT(*) FROM ‘ + @Table
        + ‘ WHERE ‘ + @Condition + ‘ GROUP BY ‘ + @GroupColumn
      SET @strCount = @strCount + ‘ SET @[email protected]@ROWCOUNT‘
      SET @strSql = ‘SELECT * FROM (SELECT TOP (2000) ‘ + @Column
        + ‘,ROW_NUMBER() OVER(‘ + @strOrderType + 
        ‘) AS NUM FROM ‘ + @Table + ‘ WHERE ‘ + @Condition + 
        ‘ GROUP BY ‘ + @GroupColumn + 
        ‘) AS T WHERE NUM BETWEEN ‘ + STR(@PageCount + 1) + 
        ‘ AND ‘ + STR(@PageCount + @PageSize)
    END
    ELSE
    BEGIN
      SET @strCount = ‘SELECT @TotalCount=COUNT(*) FROM ‘ + @Table
        + ‘ WHERE ‘ + @Condition
      SET @strSql = ‘SELECT * FROM (SELECT TOP (2000) ‘ + @Column
        + ‘,ROW_NUMBER() OVER(‘ + @strOrderType + 
        ‘) AS NUM FROM ‘ + @Table + ‘ WHERE ‘ + @Condition + 
        ‘) AS T WHERE NUM BETWEEN ‘ + STR(@PageCount + 1) + 
        ‘ AND ‘ + STR(@PageCount + @PageSize)
    END
  END
END
ELSE
  --没有查询条件
BEGIN
  IF @CurrentPage = 1
  BEGIN
    IF @GROUP = 1
    BEGIN
      SET @strCount = ‘SELECT @TotalCount=COUNT(*) FROM ‘ + @Table
        + ‘ GROUP BY ‘ + @GroupColumn
      SET @strCount = @strCount + ‘SET @[email protected]@ROWCOUNT‘
      SET @strSql = ‘SELECT TOP ‘ + STR(@PageSize) + ‘ ‘ + @Column
        + ‘ FROM ‘ + @Table + ‘ GROUP BY ‘ + @GroupColumn + ‘ ‘ + 
        @strOrderType
    END
    ELSE
    BEGIN
      SET @strCount = ‘SELECT @TotalCount=COUNT(*) FROM ‘ + @Table
      SET @strSql = ‘SELECT TOP ‘ + STR(@PageSize) + ‘ ‘ + @Column
        + ‘ FROM ‘ + @Table + ‘ ‘ + @strOrderType
    END
  END
  ELSE
  BEGIN
    IF @GROUP = 1
    BEGIN
      SET @strCount = ‘SELECT @TotalCount=COUNT(*) FROM ‘ + @Table
        + ‘ GROUP BY ‘ + @GroupColumn
      SET @strCount = @strCount + ‘SET @[email protected]@ROWCOUNT‘
      SET @strSql = ‘SELECT * FROM (SELECT TOP (2000) ‘ + @Column
        + ‘,ROW_NUMBER() OVER(‘ + @strOrderType + 
        ‘) AS NUM FROM ‘ + @Table + ‘ GROUP BY ‘ + @GroupColumn + 
        ‘) AS T WHERE NUM BETWEEN ‘ + STR(@PageCount + 1) + 
        ‘ AND ‘ + STR(@PageCount + @PageSize)
    END
    ELSE
    BEGIN
      SET @strCount = ‘SELECT @TotalCount=COUNT(*) FROM ‘ + @Table
      SET @strSql = ‘SELECT * FROM (SELECT TOP (2000) ‘ + @Column
        + ‘,ROW_NUMBER() OVER(‘ + @strOrderType + 
        ‘) AS NUM FROM ‘ + @Table + ‘) AS T WHERE NUM BETWEEN ‘ + 
        STR(@PageCount + 1) + ‘ AND ‘ + STR(@PageCount + @PageSize)
    END
  END
END
EXEC sp_executesql @strCount,
   N‘@TotalCount INT OUTPUT‘,
   @TotalCount OUTPUT
IF @TotalCount > 2000
BEGIN
  SET @TotalCount = 2000
END
IF @TotalCount%@PageSize = 0
BEGIN
  SET @TotalPage = @TotalCount / @PageSize
END
ELSE
BEGIN
  SET @TotalPage = @TotalCount / @PageSize + 1
END
SET NOCOUNT ON
EXEC (@strSql)
END
SET NOCOUNT OFF
/**调用实例：
USE [ApplicationForm]
GO

DECLARE    @return_value int,
        @TotalCount int,
        @TotalPage int

SELECT    @TotalCount = 0
SELECT    @TotalPage = 0

EXEC    @return_value = [dbo].[Pager]
        @TotalCount = @TotalCount OUTPUT,
        @TotalPage = @TotalPage OUTPUT,
        @Table = N‘ Process   AS S LEFT JOIN UserTable AS C  ON C.ID = S.Level1 LEFT JOIN UserTable  AS B ON B.ID = S.Level2 LEFT JOIN UserTable  AS E ON E.ID = S.next ‘,
        @Column = N‘ C.Name ,B.Name as Name1,S.Level3 , E.Name as Name2,S.DocumentsID,S.Info,S.Note ,S.ID‘,
        @OrderColumn = N‘S.ID Desc‘,
        @GroupColumn = N‘S.ID‘,
        @PageSize = 10,
        @CurrentPage = 1,
        @Group = 0,
        @Condition = N‘( Level3 =3 or next = 4)‘

SELECT    @TotalCount as N‘@TotalCount‘,
        @TotalPage as N‘@TotalPage‘

SELECT    ‘Return Value‘ = @return_value

GO
**/
遇到的小问题:sql语句没有间隔保存，每个语句连接加上空格。多表连接出现相同表名，用别名，如

C.Name ,B.Name as Name1,S.Level3 , E.Name as Name2,S.DocumentsID,S.Info,S.Note ,S.ID