使用存储过程（SQL 2000）在C＃中分页实现

Question

Anyone with a link to a sample code with paging that can be changed to work within a (10000+ records) table? I want to display the records on my asp.net page.

Cheers

Answer 1

Best practice for pagination, is to do it in your stored proc, so you can limit the amount of data you are pulling back, eg:

CREATE PROCEDURE dbo.GetSomeData
  @page INT,
  @size INT = 25
AS
BEGIN

    DECLARE @offset INT
    SET @offset = (@page - 1) * @size;

    WITH OrderedSet AS
    (
      SELECT Field1, Field2, Field3, ROW_NUMBER() OVER (ORDER BY Field1) AS 'Index'
      FROM SomeTable
    )
    SELECT Field1, Field2, Field3 FROM OrderedSet WHERE [Index] BETWEEN @offset AND (@offset + @size)
END
GO

That's specific to Sql Server, MySql is a little easier:

DELIMITER $$
CREATE PROCEDURE GetSomeData(IN page INT, IN size INT DEFAULT 25)
BEGIN
  DECLARE offset INT DEFAULT 0
  SET offset = (page - 1) * size;

  SELECT `Field1`, `Field2`, `Field3` FROM `SomeTable` LIMIT offset, (offset + size);
END$$
DELIMITER ;

EDIT , seems like you are using Sql 2000.

Pagination is a little trickier on Sql 2000, as you don't have any built in functions for generating an efficient page count. What you could do, is create temporary table:

CREATE PROCEDURE dbo.GetSomeData
  @page INT,
  @size INT = 25
AS
BEGIN

  DECLARE @offset INT
  SET @offset = (@page - 1) * @size

  CREATE TABLE #temp
  (
    [Index] INT IDENTITY(1, 1) PRIMARY KEY,
    [Field1] VARCHAR(100),
    [Field2] VARCHAR(100),
    [Field3] VARCHAR(100)
  )

  INSERT INTO #temp ([Field1], [Field2], [Field3])
  SELECT [Field1], [Field2], [Field3] FROM SomeTable

  SELECT [Field1], [Field2], [Field3] FROM #temp WHERE [Index] BETWEEN @offset AND (@offset + @size)
END
GO

CREATE PROCEDURE dbo.GetCoutOfSomeData
AS
BEGIN
    DECLARE @count INT
    SELECT @count = COUNT([Field1]) FROM SomeTable

    SELECT @count
END
GO

Not terribly efficient, but you work with what you've got. Now, on the server side, you can create a method to get your results back, so, for example:

public class SomeDataSelector
{
  public IEnumerable<SomeDataType> GetSomeData(int page, int size)
  {
    List<SomeDataType> result = new List<SomeDataType>();
    using (SqlConnection conn = new SqlConnection(...)) {
      using (SqlCommand command = new SqlCommand("GetSomeData", conn)) {
        command.CommandType = CommandType.StoredProcedure;

        using (SqlDataReader reader = command.ExecuteReader()) {
          while (reader.Read()) {
            // Do work here to create instance of SomeDataType.


          }
        }
      }
    }

    return result;
  }

  public int GetCoutOfSomeData()
  {
    using (SqlConnection conn = new SqlConnection(...)) {
      using (SqlCommand command = new SqlCommand("GetSomeData", conn)) {
        command.CommandType = CommandType.StoredProcedure;

        int result = (int)command.ExecuteScalar();
      }
    }
  }
}

You can then bind that to your ASP.NET control.

<asp:ObjectDataSource ID="ObjectDataSource1" runat="server" TypeName="SomeDataSelector" SelectMethod="GetSomeData" SelectCountMethod="GetCoutOfSomeData" />

<asp:GridView ID="GridView1" AutoGenerateColumns="True" DataKeyNames="Field1" DataSourceID="ObjectDataSource1" AllowPaging="True" PageSize="25" />

It's not a complete solution, but should be enough to get you going.

UPDATE A friend of mine found an alternative article about paging in Sql 2000: http://www.codeproject.com/KB/database/SQLServer2KPagingSorting.aspx

Answer 2

我在asp.net的博客“ 自定义分页类”中给出了完整的解决方案。

Answer 3

I posted this article in CodeProject a few years ago that explains in details on exactly how you can achieve that with complete source and example

http://www.codeproject.com/KB/aspnet/GridViewNeatPaging.aspx