Home Database Mysql Tutorial 创建 Oracle 分页存储过程

创建 Oracle 分页存储过程

Jun 07, 2016 pm 05:46 PM
cursor quot varchar

1.创建Oracle包的定义。使用 REF CURSOR 数据类型来处理 Oracle 结果集。REF CURSOR 是一个指向 PL/SQL 查询所返回的结果集的指针。与普通的游标不同,REF CURSOR 是一个变量,它是对游标的引用

1.创建Oracle包的定义。使用 REF CURSOR 数据类型来处理 Oracle 结果集。REF CURSOR 是一个指向 PL/SQL 查询所返回的结果集的指针。与普通的游标不同,REF CURSOR 是一个变量,它是对游标的引用

1.创建Oracle包的定义。使用 REF CURSOR 数据类型来处理 Oracle 结果集。REF CURSOR 是一个指向 PL/SQL 查询所返回的结果集的指针。与普通的游标不同,REF CURSOR 是一个变量,它是对游标的引用,可以在执行时将其设置为指向不同的结果集。使用 REF CURSOR 输出参数可以将 Oracle 结构化程序的结果集传递回调用应用程序。通过在调用应用程序中定义 OracleType.Cursor 数据类型的输出参数,可以访问 REF CURSOR 所指向的结果集。

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<pre class="brush:php;toolbar:false"><span>create or replace package MF_PAK_001 is<br>  type t_cursor is ref cursor;<br>  procedure GetDataByPage(<br>     p_tableName varchar2,<br>     p_fields varchar2,<br>     p_filter varchar2,<br>     p_sort varchar2,<br>     p_curPage number,<br>     p_pageSize number,<br>     p_cursor out t_cursor,<br>     p_totalRecords out number         <br> );<br>end MF_PAK_001;</span>
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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_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。
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<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>
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<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>
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4.在.NET中调用该分页存储过程。

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<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         Response.Write(dr[i].ToString() + ";");<br>    Response.Write("<br>");<br>}<br>conn.Close();</span>
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