创建 Oracle 分页存储过程

<span><blockquote>create or replace package MF_PAK_001 is  type t_cursor is ref cursor;  procedure GetDataByPage(     p_tableName varchar2,     p_fields varchar2,     p_filter varchar2,     p_sort varchar2,     p_curPage number,     p_pageSize number,     p_cursor out t_cursor,     p_totalRecords out number          );end MF_PAK_001;
</blockquote></span>2.创建包体。在包体中实现具体的存储过程。

<span><blockquote><span>create or replace package body MF_PAK_001 is<br />procedure GetDataByPage(<br />p_tableName varchar2,--要查询的表名<br />p_fields varchar2,--要查询的字段<br />p_filter varchar2,--过滤条件<br />p_sort varchar2,--排序字段及方向<br />p_curPage number,<br />p_pageSize number,<br />p_cursor out t_cursor,<br />p_totalRecords out number <br />)<br />is<br />v_sql varchar2(1000):='';<br />v_startRecord number(4);<br />v_endRecord number(4);<br />begin<br /></span></blockquote>--获取总的记录数<br /> <blockquote><span>v_sql:=' to_number(count(*)) from '||p_tableName;<br />if p_filter is not null then<br />v_sql:=v_sql||' where 1=1 and '||p_filter;<br />end if;<br />execute immediate v_sql into p_totalRecords;<br /><br />v_startRecord:=(p_curPage-1)*p_pageSize;<br />v_endRecord:=p_curPage*p_pageSize;<br /><br />v_sql:='select '||p_fields||' from (select '||p_fields||',rownum r from '||<br />'(select '||p_fields||' from '||p_tableName;<br />if p_filter is not null then<br />v_sql:=v_sql||' where 1=1 and '||p_filter;<br />end if;<br />if p_sort is not null then<br />v_sql:=v_sql||' order by '||p_sort;<br />end if;<br />v_sql:=v_sql||') A where rownum<='||to_char(v_endRecord)||') B where r>='||to_char(v_startRecord);<br />open p_cursor for v_sql;<br /><br />end GetDataByPage; <br />end MF_PAK_001;</span></blockquote></span>3.在Oracle中编写查询语句，执行包体中的分页存储过程，看是否能够正确执行。

<span><blockquote><p><pre class="brush:php;toolbar:false"><span>declare<br />v_cur MF_PAK_001.t_cursor;<br />v_job jobs%rowtype;<br />v_totalRecords number;<br />begin<br />  MF_PAK_001.GetDataByPage('jobs','job_id,job_title,min_salary,max_salary','min_salary>0','job_id asc',</span>

<span>　　1,10,v_cur,v_totalRecords);<br />  fetch v_cur into v_job;<br />  while v_cur%found loop<br />    dbms_output.put_line(v_job.job_id||','||v_job.job_title);<br />    fetch v_cur into v_job;<br />  end loop;<br />  dbms_output.put_line('总记录数为：'||v_totalRecords);<br />end;</span>

<span><blockquote><pre class="brush:php;toolbar:false"><span>string connString = "Data Source=ORCL;User Id=hr;Password=Pwd123456";<br />OracleConnection conn = new OracleConnection(connString);<br /><br />OracleCommand cmd = new OracleCommand();<br />cmd.Connection = conn;<br />cmd.CommandText = "MF_PAK_001.GetDataByPage";<br />cmd.CommandType = CommandType.StoredProcedure;<br /><br />cmd.Parameters.Add("p_tableName", OracleType.VarChar).Value = "jobs";<br />cmd.Parameters.Add("p_fields", OracleType.VarChar).Value = "job_id,job_title,min_salary,max_salary";<br />cmd.Parameters.Add("p_filter", OracleType.VarChar).Value = "";<br />cmd.Parameters.Add("p_sort", OracleType.VarChar).Value = "job_id asc";<br />cmd.Parameters.Add("p_curPage", OracleType.Number).Value = 1;<br />cmd.Parameters.Add("p_pageSize", OracleType.Number).Value = 10;<br />cmd.Parameters.Add("p_cursor", OracleType.Cursor).Direction =ParameterDirection.Output;<br />cmd.Parameters.Add("p_totalRecords", OracleType.Number).Direction = ParameterDirection.Output;<br /><br />conn.Open();<br />OracleDataReader dr = cmd.ExecuteReader();<br /><br />while (dr.Read())<br />{<br />    for (int i = 0; i < dr.FieldCount; i++)<br />        Response.Write(dr[i].ToString() + ";");<br />    Response.Write("<br/>");<br />}<br />conn.Close();</span>