问个 jdbc 的不是伸手。。已经搜好长时间。。

package com.jdbc;

import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException;

public class Select {

public Student findById(String sno){ Connection cOnn= null; PreparedStatement ps = null; ResultSet rs = null; Student s = new Student(); try { cOnn= DBUtil.getConnection(); StringBuilder sb = new StringBuilder(); sb.append(" select * from student where SNO = ?"); ps = conn.prepareStatement(sb.toString()); ps.setString(1, sno); rs = ps.executeQuery(); System.out.println(sb); System.out.println(rs.next()); if(rs.next()){ s.setSno(rs.getString("SNO")); s.setSname(rs.getString("SNAME")); s.setAge(rs.getInt("AGE")); s.setSex(rs.getString("AGR")); s.setDept(rs.getString("DEPT")); System.out.println(s.getSno()); return s; }else{ return null; } } catch (Exception e) { e.printStackTrace(); return null; }finally{ if(rs != null){ try { rs.close(); } catch (SQLException e) { e.printStackTrace(); } rs = null; } if(ps != null){ try { ps.close(); } catch (SQLException e) { e.printStackTrace(); } ps = null; } } } public static void main(String[] args) { Select s = new Select(); Student student = s.findById("1004"); System.out.println(student); } /** * 控制台输出: * select * from student where SNO = ? *true *null */ 

}