java.sql.SQLException: 结果集已耗尽我用oracle数据库,建了两个表结构如下:
单位表:id_danwei number ,name_danwei varchar2 ,其中id_danwei是主键。
人员表:id_renyuan number, id_danwei number , name varchar2 ,其中id_renyuan是主键,id_danwei是外键。
我用jsp对表管理,删除单位表中id_danwei=3的记录时,先查看人员表里是否有id_danwei=3的记录,如果有则不允许删除,如果没有则可以删除。
代码如下:
<%@ page contentType= "text/html; charset=gb2312 " language= "java " import= "java.sql.* "
errorPage= " " %>
<%@ include file= "dbcon.jsp " %>
<html>
<head>
<meta http-equiv= "Content-Type " content= "text/html; charset=gb2312 ">
<title> 删除 </title>
</head>
<%
int id_danwei=Integer.parseInt(request.getParameter( "id_danwei "));
if(id_danwei!=0){
try{
String sql_renyuan= "select id_renyuan from renyuan where id_danwei= "+id_danwei;
Statement stmt_renyuan=conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
ResultSet rs_renyuan=stmt_renyuan.executeQuery(sql_renyuan);
rs_renyuan.next();
int id_renyuan=rs_renyuan.getInt(1);
rs_renyuan.close();
stmt_renyuan.close();
if(id_renyuan==0){
try{
String sql= "delete from danwei where id_danwei= "+id_danwei;
Statement stmt=conn.createStatement();
stmt.executeUpdate(sql);
out.print( "删除成功! ");
stmt.close();
}catch(
SQLException e){
out.print( "e: "+e);
}
}
else{
out.print( "单位数据不能删除,还有所属人员,请先从人员表中删除所属人员! ");
out.print( " <a href= 'danwei_show.jsp '> 返回 </a> ");
}
conn.close();