ASP.NET调用oracle存储过程实现快速分页

2022-07-15 80酷酷网 80kuku.com

　　asp.net|oracle|存储过程|分页

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