ASP.NET调用oracle存储过程实现快速分页
ASP.NET调用oracle存储过程实现快速分页 《使用 ADO.NET 访问 Oracle 9i 存储过程》见下面的介绍(如果对这个不怎么懂的,还是先看看下面文章)http://www.microsoft.com/china/MSDN/library/data/dataAccess/DMSDNorsps.mspx
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:
/// <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)
{
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];
}
好了,代码都罗列到上面了,至于用,大家应该知道了吧,如果有什么问题,可以给我发邮件:grwdpy@gmail.com或者是grwdpy@hotmail.com