Oracle高效分页存储过程
Oracle高效分页存储过程
Oracle高效分页存储过程:
- create or replace package JT_P_page is
- type type_cur is ref cursor; --定义游标变量用于返回记录集
- procedure Pagination (Pindex in number, --要显示的页数索引,从0开始
- Psql in varchar2, --产生分页数据的查询语句
- Psize in number, --每页显示记录数
- Pcount out number, --返回的分页数
- Prowcount out number, --返回的记录数
- v_cur out type_cur --返回分页数据的游标
- );
- end JT_P_page;
- commit;
- --定义包主体
- create or replace package body JT_P_page is
- procedure Pagination(Pindex in number, --要显示的页数索引,从0开始
- Psql in varchar2, --产生分页数据的查询语句
- Psize in number, --每页显示记录数
- Pcount out number, --返回的分页数
- Prowcount out number, --返回的记录数
- v_cur out type_cur --返回分页数据的游标
- ) AS
- v_sql VARCHAR2(1000);
- v_Pbegin number;
- v_Pend number;
- begin
- v_sql := 'select count(*) from (' || Psql || ')';
- execute immediate v_sql into Prowcount; --计算记录总数
- Pcount := ceil(Prowcount / Psize); --计算分页总数
- --显示任意页内容
- v_Pend := Pindex * Psize + Psize;
- v_Pbegin := v_Pend - Psize + 1;
- v_sql := 'select * from (select rownum rn,t.* from (' || Psql || ')t) where rn between ' || v_Pbegin || ' and ' || v_Pend;
- open v_cur for v_sql;
- end Pagination;
- end JT_P_page;
- commit;
- *************************************************************
- OracleParameter[] param = new OracleParameter[] { new OracleParameter("Pindex", OracleType.Number), new OracleParameter("Psql", OracleType.VarChar), new OracleParameter("Psize", OracleType.Number), new OracleParameter("Pcount", OracleType.Number), new OracleParameter("Prowcount", OracleType.Number), new OracleParameter("v_cur", OracleType.Cursor) };
- param[0].Value = index;
- param[1].Value = sql;
- param[2].Value = pageSize;
- param[0].Direction = ParameterDirection.Input;
- param[1].Direction = ParameterDirection.Input;
- param[2].Direction = ParameterDirection.Input;
- param[3].Direction = ParameterDirection.Output;
- param[4].Direction = ParameterDirection.Output;
- param[5].Direction = ParameterDirection.Output;
- DataSet ds = OracleHelper.ExecuteDataset(Form1.OracleConnString, CommandType.StoredProcedure, "JT_P_page.Pagination", param);
- int pcount = int.Parse(param[3].Value.ToString());
- int record = int.Parse(param[4].Value.ToString());
- lb_pcount.Text = pcount.ToString();
- dataGridView1.DataSource = ds.Tables[0];
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