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我有以下代码从 Oracle 表中检索数据。这工作正常。

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@include file="DBCon.jsp" %>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body><table>
        <%
        String a=request.getParameter("type").trim();
        String b=request.getParameter("user").trim();
        String c=request.getParameter("from").trim();
        String d=request.getParameter("to").trim();
        ResultSetMetaData rsmd;
        String st="SELECT type, Hari, Rakesh, Total FROM (select (type),  max( decode( SPECIALIST, 'Hari', cnt, null ) ) Hari,  max( decode( SPECIALIST, 'Rakesh', cnt, null ) ) Rakesh,  Sum(cnt) total  from ( select (type),specialist, sum(update_count) cnt  from scope1 where (RECVD_DATE >='"+c+"' and RECVD_DATE <='"+d+"')  group by (type),specialist ) q  group by (type)  Union Select 'Total' as type, Sum(Hari) Hari,Sum(Rakesh) Rakesh,Sum(total) Total from (  select (type),  max( decode( SPECIALIST, 'Hari', cnt, null ) ) Hari,  max( decode( SPECIALIST, 'Rakesh', cnt, null ) ) Rakesh,  Sum(cnt) total  from ( select (type),specialist, sum(update_count) cnt  from scope1 where (RECVD_DATE >='"+c+"' and RECVD_DATE <='"+d+"')  group by (type),specialist ) q  group by (type)  )a) b Order by Total";        
try{%>
        <tr><b><%=b%></b></tr><%
            //String sql=(st);
            //out.print(sql);
            ps1=con.prepareStatement(st);
            rs1=ps1.executeQuery();
            rsmd=rs1.getMetaData();
            int cou=rsmd.getColumnCount();
            for(int i=1;i<cou;i++){
            %>
        <td><%=rsmd.getColumnName(i)%>
        <%
                   }
            %>
        <td>Total</td>
        <%
            while(rs1.next())
            {
            %>

            <tr><td><b><%=rs1.getString(1)%></b></td><td><%=rs1.getString(2)%></td><td><%=rs1.getString(3)%></td><td><%=rs1.getString(4)%> </td></tr>
            <%
            }
        }
        catch(Exception e)
        {
            out.println(e);
}
%>
   </table> </body>
</html>

但是在这里，我需要你们的帮助，我可以使下面的陈述动态化。

<tr><td><b><%=rs1.getString(1)%></b></td><td><%=rs1.getString(2)%></td><td><%=rs1.getString(3)%></td><td><%=rs1.getString(4)%> </td></tr>

这里使用的sql语句如下。

SELECT type, Hari, Rakesh, Total FROM (select (type),  max( decode( SPECIALIST, 'Hari', cnt, null ) ) Hari,  max( decode( SPECIALIST, 'Rakesh', cnt, null ) ) Rakesh,  Sum(cnt) total  from ( select (type),specialist, sum(update_count) cnt  from scope1 where (RECVD_DATE >='"+c+"' and RECVD_DATE <='"+d+"')  group by (type),specialist ) q  group by (type)  Union Select 'Total' as type, Sum(Hari) Hari,Sum(Rakesh) Rakesh,Sum(total) Total from (  select (type),  max( decode( SPECIALIST, 'Hari', cnt, null ) ) Hari,  max( decode( SPECIALIST, 'Rakesh', cnt, null ) ) Rakesh,  Sum(cnt) total  from ( select (type),specialist, sum(update_count) cnt  from scope1 where (RECVD_DATE >='"+c+"' and RECVD_DATE <='"+d+"')  group by (type),specialist ) q  group by (type)  )a) b Order by Total

我希望检索数据，例如

<%=rs1.getString(i)%>

谢谢

4

1 回答 1

1 
<%
for (int i = 1; i < 5; i++) {
%>

<td><%= rs1.getString(i) %></td>

<%
}
%>

但是我永远不会那样做。JSP 不应使用 scriptlet。他们不应该执行数据库查询。他们唯一的工作应该是使用存储在请求属性中的对象生成 HTML 标记。

SQL 查询应该在您首选的 MVC 框架的 servlet 或操作中。该 servlet 将获取数据，将其存储在 a 中List<MyObject>，将此列表放入请求属性中，然后转发给 JSP。

然后，JSP 将使用 JSTL 和 JSP EL（以及其他自定义标记，如果需要）来显示这个List<MyObject>.

于 2012-12-03T12:47:50.497 回答