[java]代碼庫(kù)package com.ww.service;

import java.lang.reflect.Array;

import java.sql.Connection;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.ArrayList;

import com.mysql.jdbc.PreparedStatement;

import com.ww.db.DBHelper;

import com.ww.entity.Score;

import com.ww.entity.Student;

public class SysService {

DBHelper dbHelper=new DBHelper();

//查詢所有學(xué)生的編號(hào)，姓名和分?jǐn)?shù)，并返回

public ArrayList getAllInfo(){

String sql="select * from stu s,sco sc where s.stu_id=sc.stu_id";

Connection connection=dbHelper.getConnection();

ArrayList scores=new ArrayList();

try {

PreparedStatement psd=(PreparedStatement)connection.prepareStatement(sql);

ResultSet resultSet=psd.executeQuery();

while (resultSet.next()) {

Student student=new Student();

Score score=new Score();

student.setId(resultSet.getInt("stu_id"));

student.setName(resultSet.getString("stu_name"));

score.setId(resultSet.getInt("sco_id"));

score.setScos(resultSet.getInt("emg_sco"));

score.setStudent(student);

scores.add(score);

}

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return scores;

}

//添加

public boolean addInfo(String name,int a){

String sql1="insert into stu VALUES(null,?)";

String sql2="insert into sco VALUES(null,(select MAX(stu_id) from stu),?)";

Connection connection=dbHelper.getConnection();

try {

//執(zhí)行向主表添加數(shù)據(jù)

PreparedStatement psd1=(PreparedStatement)connection.prepareStatement(sql1);

//執(zhí)行向從表中添加數(shù)據(jù)

PreparedStatement psd2=(PreparedStatement)connection.prepareStatement(sql2);

psd1.setString(1, name);

int b=psd1.executeUpdate();

if (b>0) {

//向主表中完成添加

psd2.setInt(1, a);

int s=psd2.executeUpdate();

if (s>0) {

return true;

}

}

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return false;

}

//修改

public boolean update(int id,String name,int sc) {

String sql="update stu s,sco sc set s.stu_name=?,sc.emg_sco=? where s.stu_id=sc.stu_id and s.stu_id=?";

Connection connection=dbHelper.getConnection();

try {

PreparedStatement psd=(PreparedStatement)connection.prepareStatement(sql);

psd.setString(1, name);

psd.setInt(2, sc);

psd.setInt(3, id);

if(psd.executeUpdate()>=2){

return true;

}

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return false;

}

//刪除

public boolean deleteInfo(int id){

String sql="delete from sco where stu_id=?";

Connection connection=dbHelper.getConnection();

try {

PreparedStatement psd=(PreparedStatement)connection.prepareStatement(sql);

psd.setInt(1, id);

if(psd.executeUpdate()>0){

return true;

}

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return false;

}

}

[源代碼打包下載]

多表增刪改查.zip(50積分)[15 次下載]

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