使用存储过程在C#中实现分页实现(SQL 2000)

Question

任何人都有一个带有分页的示例代码的链接,可以更改为在(10000+记录)表中工作？我想在我的asp.net页面上显示记录.

干杯

Answer 1

分页的最佳做法是在存储过程中执行此操作,因此您可以限制要撤回的数据量,例如:

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

这是特定于Sql Server的,MySql更容易一些:

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 ;

编辑,似乎你正在使用Sql 2000.

分页在Sql 2000上有点棘手,因为您没有任何内置函数来生成有效的页数.你能做什么,是创建临时表:

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

效率不是很高,但你可以使用你所拥有的东西.现在,在服务器端,您可以创建一个方法来获取结果,例如:

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();
      }
    }
  }
}

然后,您可以将其绑定到ASP.NET控件.

<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" />

这不是一个完整的解决方案,但应该足以让你前进.

更新我的一位朋友在Sql 2000中找到了一篇关于分页的替代文章:http://www.codeproject.com/KB/database/SQLServer2KPagingSorting.aspx