JDBC删除表数据

 1 package qddx.JDBC;
 2 import java.sql.*;
 3 public class DeletebbsVo {
 4     public void deletebbsVo(int id){
 5         Connection conn = null;
 6         PreparedStatement pst = null;
 7         try{
 8         conn = JDBC_Connection.getConnection();
 9         String sql = "delete from article where id=?";
10         pst=conn.prepareStatement(sql);
11         pst.setInt(1, id);
12         pst.executeUpdate();
13         System.out.println("删除成功");
14         }catch(SQLException e){
15             e.printStackTrace();
16         }finally{
17             JDBC_Connection.free(null, conn, pst);
18         }
19     }
20     public static void main(String[] args) {
21         // TODO Auto-generated method stub
22         DeletebbsVo delete = new DeletebbsVo();
23         int id = 3;
24         bbsVo vo = new bbsVo();
25         QueryById queryById = new QueryById();//调用查询方法，查询id为3 的数据是否存在。
26         vo = queryById.QuerybbsVoById(id);
27         if(vo !=null){//查询不为空 则进行删除
28             delete.deletebbsVo(id);
29         }else{
30             System.out.println("删除失败 id为"+id+"的数据不存在");
31             
32         }
33         
34     }
35 
36 }