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ASP.NET调用oracle存储过程实现快速分页

 2007-10-29 13:21:47 来源:WEB开发网   
核心提示:在WEB开发中,分页是我们必须要解决的一个问题,ASP.NET调用oracle存储过程实现快速分页,今天我们一起来看看ASP.NET调用ORACEL存储过程实现分页的方法,包定义:create or replace package MaterialManage is TYPE T_CURSOR IS REF CURSO

在WEB开发中,分页是我们必须要解决的一个问题,今天我们一起来看看ASP.NET调用ORACEL存储过程实现分页的方法。

包定义:

  create or replace package MaterialManage is
  TYPE T_CURSOR IS REF CURSOR;
  Procedure Per_QuickPage
  (
  TbName in varchar2, --表名
  FieldStr in varchar2, --字段集
  RowFilter in varchar2, --过滤条件
  SortStr in varchar2, --排序集
  RownumFieldStr in varchar2, --分页条件
  TotalCount out number, --总记录数
  Cur_ReturnCur out T_CURSOR --返回的游标
  );
  end MaterialManage;

包主体:

  create or replace package body MaterialManage is
  Procedure Per_QuickPage
  (
  TbName in varchar2, --表 名
  FieldStr in varchar2, --字段集
  RowFilter in varchar2, --过滤条件
  SortStr in varchar2, --排序集
  MinRowNum in number, --分页小值
  MaxRowNum in number, --分页大值
  TotalCount out number, --总记录数
  Cur_ReturnCur out T_CURSOR
  )
  is
  v_SourceTb1 varchar2(3000); --动态表名1
  v_SourceTb2 varchar2(3000); --动态表名2
  v_SourceTb3 varchar2(3000); --动态表名3
  v_SourceTb4 varchar2(3000); --动态表名4
  v_TotalCount varchar2(50); --总记录数
  v_sql varchar2(3000); --动态sql
  begin
  v_SourceTb1 := ’’’’(select ’’’’|| FieldStr ||’’’’ from ’’’’|| TbName ||’’’’) SourceTb1’’’’;
  v_SourceTb2 := ’’’’(select * from ’’’’|| v_SourceTb1 ||’’’’ where ’’’’|| RowFilter ||’’’’ ’’’’|| SortStr ||’’’’) SourceTb2’’’’;
  v_SourceTb3 := ’’’’(select rownum as Rowindex,SourceTb2.* from ’’’’|| v_SourceTb2 ||’’’’ where rownum<=’’’’|| MaxRowNum ||’’’’) SourceTb3’’’’;
  v_SourceTb4 := ’’’’(select * from ’’’’|| v_SourceTb1 ||’’’’ where ’’’’|| RowFilter ||’’’’) SourceTb4’’’’;
  v_sql := ’’’’select count(*) as TotalCount from ’’’’|| v_SourceTb4;
  execute immediate v_sql into v_TotalCount;
  TotalCount := v_TotalCount;
  v_sql := ’’’’select * from ’’’’|| v_SourceTb3 ||’’’’ where RowIndex >=’’’’||MinRowNum;
  open Cur_ReturnCur for v_sql;
  end Per_QuickPage;
  END MaterialManage;


  由于oracle有个rownum特性,所以分页的时候就是利用rownum来实现。如果大家还有什么更好的办法记得告诉我一声,多谢了,因为我测试了上面的分页方法效率并不是很高。

存储过程返回了两个参数:TotalCount :当前条件下的总记录数 Cur_ReturnCur :游标类型,就是所要读取的记录的集合

下面是ASP.NET中调用的代码:


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}" src=http://www.webjx.com/database/"http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif" align="top" />{ 
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}" src=http://www.webjx.com/database/"http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif" align="top" />/**//// <summary> 
/// 调用存储过程实现快速分页 
/// </summary> 
/// <param name="TbName">表名称</param> 
/// <param name="FieldStr">字段名称</param> 
/// <param name="RowFilter">过滤条件</param> 
/// <param name="SortStr">排序字段</param> 
/// <param name="MinPageNum">分页小值</param> 
/// <param name="MaxPageNum">分页大值</param> 
/// <param name="TotalCount">总记录(需要返回)</param> 
/// <returns>DataTable</returns> 
public DataTable QuickPage(string TbName,string FieldStr,string RowFilter,string SortStr,int MinRowNum,int MaxRowNum,ref int RecordCount) 

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}" src=http://www.webjx.com/database/"http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif" align="top" />{ 
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}" src=http://www.webjx.com/database/"http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif" align="top" />{ 
 OracleConnection conn = new OracleConnection(ConfigurationSettings.AppSettings["OracleConnstr"].ToString());
OracleCommand cmd  = new OracleCommand(); 
 cmd.Connection  = conn; 
 cmd.CommandText  = "MaterialManage.Per_QuickPage"; 
 cmd.CommandType  = CommandType.StoredProcedure; 
 cmd.Parameters.Add("TbName",OracleType.VarChar,50);   //表  名 
 cmd.Parameters["TbName"].Direction = ParameterDirection.Input; 
 cmd.Parameters["TbName"].Value   = TbName; 
 cmd.Parameters.Add("FieldStr",OracleType.VarChar,3000);  //字段集 
 cmd.Parameters["FieldStr"].Direction = ParameterDirection.Input; 
 cmd.Parameters["FieldStr"].Value   = FieldStr; 
 cmd.Parameters.Add("RowFilter",OracleType.VarChar,3000);  //过滤条件 
 cmd.Parameters["RowFilter"].Direction = ParameterDirection.Input; 
 cmd.Parameters["RowFilter"].Value   = RowFilter; 
 cmd.Parameters.Add("SortStr",OracleType.VarChar,3000);  //排序字段 
 cmd.Parameters["SortStr"].Direction = ParameterDirection.Input; 
 cmd.Parameters["SortStr"].Value   = SortStr; 
 cmd.Parameters.Add("MinRowNum",OracleType.Number);   //分页小值 
 cmd.Parameters["MinRowNum"].Direction = ParameterDirection.Input; 
 cmd.Parameters["MinRowNum"].Value   = MinRowNum; 
 cmd.Parameters.Add("MaxRowNum",OracleType.Number);   //分页大值 
 cmd.Parameters["MaxRowNum"].Direction = ParameterDirection.Input; 
 cmd.Parameters["MaxRowNum"].Value   = MaxRowNum; 
 cmd.Parameters.Add("TotalCount",OracleType.Number);   //页总记录数 
 cmd.Parameters["TotalCount"].Direction = ParameterDirection.Output; 
 cmd.Parameters["TotalCount"].Value   = 0; 
 cmd.Parameters.Add("Cur_ReturnCur",OracleType.Cursor);  //返回的游标 
 cmd.Parameters["Cur_ReturnCur"].Direction = ParameterDirection.Output; 
 DataSet Ds = new DataSet(); 
 OracleDataAdapter adapter= new OracleDataAdapter(cmd); 
 adapter.Fill(Ds); 
 conn.Close(); 
 //总记录数 
 RecordCount  = int.Parse(cmd.Parameters["TotalCount"].Value.ToString()); 
return Ds.Tables[0]; 
}

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