Oracle数据分页，并传出数据集

1、创建Package

create or replace package forPaged is
       type my_csr is ref cursor;
       procedure getPaged(tableName in varchar2,objectid in number,fields in varchar2,wherecase in varchar2,orderFieldStr  varchar2,pageSize in number,pageIndex in number,expression varchar2,totalCount out number,csr out forPaged.my_csr);
end forPaged;

2、创建存储过程；里面用到了父子级联查询；SQL中如果用到了单引号，需要再用一个单引号转义

create or replace procedure getPaged(tableName in varchar2,objectid in number,fields in varchar2,wherecase in varchar2,orderFieldStr in varchar2,pageSize in number,pageIndex in number,expression varchar2,totalCount out number,csr out forPaged.my_csr) is
     v_sql varchar2(1000);
     v_begin number:=(pageIndex-1)*pageSize+1; --开始记录
     v_end number:=pageIndex*pageSize;         --结束记录
     begin
       v_sql:='select count(*) from (select entitycode from '|| tableName ||' where '|| wherecase||' and Exists(select distinct companycode from company where '||tableName||'.entitycode=company.companycode start with object_id='||objectid||' connect by prior object_id=parent_id)) t';
       execute immediate v_sql into totalCount;
       if expression is not null then
         v_sql:='select '|| fields ||','||expression||' HeJi from
         (select t.* ,rownum rn from (select '|| fields ||' from '|| tableName|| ' where '|| wherecase ||' and Exists(select distinct companycode from company where '||tableName||'.entitycode=company.companycode start with object_id='||objectid||' connect by prior object_id=parent_id) order by '|| orderFieldStr ||' ) t) 
        where rn>='|| v_begin||' and rn<='|| v_end;
      else
        
        v_sql:='select '|| fields ||' from
          (select t.* ,rownum rn from (select '|| fields ||' from '|| tableName|| ' where '|| wherecase ||' and Exists(select distinct companycode from company where '||tableName||'.entitycode=company.companycode start with object_id='||objectid||' connect by prior object_id=parent_id) order by '|| orderFieldStr ||' ) t) 
        where rn>='|| v_begin||' and rn<='|| v_end;
        end if;
          open csr for v_sql;
          --close csr;关闭后则不会传出数据集
       end getPaged;

3、Asp.Net中使用

 /// <summary>
        /// 使用存储过程实现的分页查询
        /// </summary>
        /// <param name="dataTableName">数据表</param>
        /// <param name="objectid">实体表主键</param>
        /// <param name="fields">表中字段拼接的字符串</param>
        /// <param name="wherecase">查询条件</param>
        /// <param name="pagesize">每页显示数据行数</param>
        /// <param name="pageIndex">当前页</param>
        /// <param name="orderFieldStr">排序字段拼接的字符串</param>
        /// <param name="totalCount">符合条件总记录数</param>
        /// <param name="expression">计算表达式</param>
        /// <returns></returns>
        public DataTable getReportDataByPage(M_SelectData model, out int totalCount)
        {
            IList<OracleParameter> dataParameters = new List<OracleParameter>();
            dataParameters.Add(new OracleParameter("tableName", model.tableName));
            dataParameters.Add(new OracleParameter("objectid", model.companyId));
            dataParameters.Add(new OracleParameter("fields", model.fieldsStr));
            dataParameters.Add(new OracleParameter("wherecase", model.whereStr));
            dataParameters.Add(new OracleParameter("pageSize", model.pageSize));
            dataParameters.Add(new OracleParameter("pageIndex", model.pageIndex));
            dataParameters.Add(new OracleParameter("orderFieldStr", model.orderFieldStr));
            dataParameters.Add(new OracleParameter("expression", model.expression));
            dataParameters.Add(new OracleParameter("totalCount", OracleType.Int32));
            dataParameters.Add(new OracleParameter("csr", OracleType.Cursor));
            dataParameters[dataParameters.Count - 1].Direction = ParameterDirection.Output;
            dataParameters[dataParameters.Count - 2].Direction = ParameterDirection.Output;
            DataTable dataTable = OracleSqlHelper.ExcuteProcedure("getpaged", dataParameters.ToArray());
            totalCount = int.Parse(dataParameters[dataParameters.Count - 2].Value.ToString());
            return dataTable;
        }

  /// <summary>
        /// 分页存储过程
        /// </summary>
        /// <param name="proName">存储过程名字</param>
        /// <param name="parameters">tableName表名，fields查询字段字符串，wherecase查询条件，orderFieldStr排序字段字符串，pageSize每页显示数据行数，pageIndex页码，totalCount总记录数，传出，csr游标，传出</param>
        /// <returns></returns>
        public static DataTable ExcuteProcedure(string proName, OracleParameter[] parameters)
        {
            DataTable table = new DataTable();
            using (OracleConnection conn = new OracleConnection(connStr))
            {
                using (OracleCommand comm = new OracleCommand(proName, conn))
                {
                    if (parameters.Length > 0)
                    {
                        comm.Parameters.AddRange(parameters);
                    }
                    comm.CommandType = CommandType.StoredProcedure;
                    conn.Open();
                    OracleDataAdapter oda = new OracleDataAdapter(comm);
                    DataSet ds = new DataSet();
                    oda.Fill(ds);
                    //得到查询结果表
                    table = ds.Tables[0];
                }
            }
            return table;
        }