修改数据时用到update语句，使用这个语句时也要有条件的，指定修改某一行的数据，没有条件判断，则修改全部。
package qddx.JDBC;
import java.sql.*;
public class UpdatebbsVo { public void update(bbsVo vo){
Connection conn = null;
PreparedStatement pst = null;
String sql = "update article set id=?,pid=?,rootid=?, title=?,cont=?,pdate=?,isleaf=? where id=?";
try{
conn = JDBC_Connection.getConnection();
pst = conn.prepareStatement(sql);
pst.setInt(1, vo.getId());
pst.setInt(2, vo.getPid());
pst.setInt(3, vo.getRootid());
pst.setString(4, vo.getTitle());
pst.setString(5, vo.getCont());
pst.setTimestamp(6, vo.getPdate());
pst.setInt(7, vo.getIsleaf());
pst.setInt(8, vo.getId());
pst.executeUpdate(); }catch(SQLException e){
e.printStackTrace();
}finally{
JDBC_Connection.free(null, conn, pst);
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
UpdatebbsVo updatebbs = new UpdatebbsVo();
int id = 13;
int pid = 1;
int rootid = 1;
String title = "蚂蚁也不好过";
String cont = "蚂蚁也不好过";
java.util.Date date = new java.util.Date();
Timestamp pdate = new Timestamp(date.getTime());
int isleaf = 0;
QueryById query = new QueryById();
bbsVo bvo = new bbsVo();
bvo = query.QuerybbsVoById(id);
if(bvo!=null){
bbsVo vo = new bbsVo();
vo.setId(id);
vo.setPid(pid);
vo.setRootid(rootid);
vo.setTitle(title);
vo.setCont(cont);
vo.setPdate(pdate);
vo.setIsleaf(isleaf);
updatebbs.update(vo);
System.out.println("修改了 id为 "+id+"的数据");
}else{
System.out.println("id 为 "+id+" 的数据不存在");
}
} }