mysql資料庫程式實現班級管理系統(GradeMangerSystem_MVC_V1.1)及mvc分層
阿新 • • 發佈：2018-12-29
MVC軟體架構模式：
view檢視層：負責與使用者進行互動，介面顯示
model模型層：業務處理，持久儲存資料
contrl控制層：負責接收介面資料組裝傳給model處理，獲取model層顯示到介面。
bean類表示java實體：
1.所有屬性私有化，
2.每個屬性對應公共的get()和set()方法
3.可以定義多個構造方法
專案名稱: 《班級管理系統》 英文:GradeMangerSystem
功能描術: 班級管理系統是對班級學生進行管理的一套系統,
具體包含學生管理、班級管理、學生選班、學生入班等功能.
要求：
1>.建立一個班級類Grade至少包含：班級名稱(name)、編號(id),班級所有學生(students)三個屬性;
在Grade類中封裝班級管理功能: 建立班級(addGrade)、顯示班級(showAllClass)、
顯示班級所有學生(showAllStudentByGrade)
2>.建立學生類Student要求與學生資訊管理系統相同.
3>.選擇班級不存在時需給出提示。
3>.通過輸入命令進行互動操作,控制檯輸出效果如下：
======= 歡迎進入班級管理系統！ ======
=====【班級管理系統主介面】=======
1 班級管理, 2 學生管理, 3 退出
------------------1班級管理-----------------------------
<輸入操作命令:>
1
======班級管理操作=========
1 建立班級, 2 顯示班級, 3 檢視班級學生, 4返回班級系統主介面
------------------1 建立班級-----------------------------
<輸入操作命令:>
1
請輸入班級名稱:
java班
請輸入班級編號:
1001
======新增成功 ! 班級名是 :Java班,編號是 : 1001=========
------------------2顯示班級-----------------------------
<輸入操作命令:>
2
班級 編號
java班 1001
IOS 1002
------------------3根據班級編號檢視班級學生---------------------
<輸入操作命令:>
3
請輸入班級名稱:
Java班
班級 學生 年齡 性別
java班 張三 23 男
java班 王二 24 男
java班 小明 23 男
------------------4返回班級系統主介面--------------------
<輸入操作命令:>
4
=====【班級管理系統主介面】=======
1 班級管理, 2 學生管理, 3 退出
------------------2學生管理---------------------------
<輸入操作命令:>
2
=====學生管理主介面========
1 新增學生, 2 顯示學生 , 3 查詢學生 , 4 返回班級系統主介面
------------------1新增學生---------------------------
<輸入操作命令:>
1
請輸入姓名:
小麗
請輸入學號:
10
請輸入年齡：
25
請輸入性別:
女
請輸入班級名稱:
java班
======新增成功 ! 學生姓名是 :小麗,學號是 :10，選擇班級是java班= ========
------------------2 顯示學生----------------------------
<輸入操作命令:>
2
姓名 學號 年齡 性別 班級
小明 10 23 男 java班
莉莉 21 24 女 IOS班
張三 11 19 男 java班
------------------3 查詢學生----------------------------
<輸入操作命令:>
3
請輸入學生姓名:
莉莉
姓名 學號 年齡 性別 班級
莉莉 21 24 女 IOS班
------------------4返回班級系統主介面--------------------
<輸入操作命令:>
4
=====【班級管理系統主介面】=======
1 班級管理, 2 學生管理, 3 退出
-------------------- 3 退出-------------------
<輸入操作命令:>
3
==== 您已經退出《班級管理系統》 ====
package cn.sxb.day11;
import cn.sxb.day11.KeyBoardUtil;
import cn.sxb.day11.Student;
public class Student {
String name;
String gname;//班級編號
int number;
int age;
int sex;
public Student(String name, String gname, int number, int age, int sex) {
this.name = name;
this.gname = gname;
this.number = number;
this.age = age;
this.sex = sex;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getGname() {
return gname;
}
public void setGname(String gname) {
this.gname = gname;
}
public int getNumber() {
return number;
}
public void setNumber(int number) {
this.number = number;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public int getSex() {
return sex;
}
public void setSex(int sex) {
this.sex = sex;
}
}
package cn.sxb.day11;
public class Grade {
String gradeName;
int gradeNumber;//班級編號
public Grade(String gradeName, int gradeNumber) {
this.gradeName = gradeName;
this.gradeNumber = gradeNumber;
}
}
package cn.sxb.day11;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class UtilDB {
private static final String URL = "jdbc:mysql://192.168.5.17:3306/db1606";
private static final String USER = "test";
private static final String PASSWORD = "123321";
/**
* 構造方法載入驅動
*/
public UtilDB() {
try {
Class.forName("com.mysql.jdbc.Driver");// 載入mysql驅動
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
/**
* 建立連線資料庫
*/
public Connection getConnection() {
Connection connect = null;
try {
connect = DriverManager.getConnection(URL, USER, PASSWORD);// 試圖建立到給定資料庫URL的連線
// if (connect == null) {
// System.out.println("資料庫連線失敗");
// } else {
// System.out.println("資料庫連線成功");
// }
} catch (SQLException e) {
e.printStackTrace();
}
return connect;
}
/**
* 關閉資料庫連線
*/
public void closeConnection(Connection connect) {
try {
if (connect != null)
connect.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
package cn.sxb.day11;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class KeyBoardUtil {
/**
* 使用io流，獲取從鍵盤輸入到程式。使用Input(從外部裝置到程式為輸入，程式到外部裝置為輸出)；
* System.in(out)標準系統輸入輸出中，不需要關閉流,由系統自動關閉。否則在後面測試類中會回報流關閉錯誤
*/
public static String getStringKeyBoard() {
String name = "";
InputStreamReader isr = null;
BufferedReader br = null;
try {
isr = new InputStreamReader(System.in);
br = new BufferedReader(isr);
name = br.readLine();
} catch (IOException e) {
e.printStackTrace();
}
return name;
}
public static int getintKeyBoard() {
while (true) {
int number = 0;
InputStreamReader isr = null;
BufferedReader br = null;
try {
isr = new InputStreamReader(System.in);
br = new BufferedReader(isr);
String s = br.readLine();// 在緩衝流中用readLine()，每行讀成String型。在轉換成int型
number = Integer.parseInt(s);
return number;
} catch (IOException e) {
e.printStackTrace();
} catch (NumberFormatException a) {
System.out.println("請輸入正確數值格式");
}
}
}
}
package cn.sxb.day11;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import cn.sxb.day11.KeyBoardUtil;
import cn.sxb.day11.Student;
public class StudentDemo extends UtilDB{
public static void main(String[] args) {
StudentDemo sd = new StudentDemo();
// sd.createGradeTable();
// sd.addStudent(sd.addStudentMessageByKeyBoard());
// sd.showAllStudentMessage();
// sd.findStudentMessageByName();
}
/**
* 建立stu表
*/
public void createGradeTable() {
Connection connect = null;
Statement statement = null;
String sql = "create table stu (" + "number int(11) not null primary key," // 主鍵
+ "name varchar(10) not null," // 姓名
+ "gname varchar(10) not null," // 班級名
+ "age int(3) not null," // 年齡
+ "sex int(1) not null" // 性別
+ ")";
try {
connect = getConnection();
statement = connect.createStatement();
statement.execute(sql);
} catch (SQLException e) {
e.printStackTrace();
} finally {
if (statement != null)
try {
statement.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
closeConnection(connect);
}
/**
* 鍵盤新增學生資訊
*/
public Student addStudentMessageByKeyBoard(){
System.out.println("請輸入學生姓名:");
String name = KeyBoardUtil.getStringKeyBoard();
System.out.println("請輸入學生班級:");
String gname = KeyBoardUtil.getStringKeyBoard();
System.out.println("請輸入學生學號:");
int number = KeyBoardUtil.getintKeyBoard();
System.out.println("請輸入學生年齡:");
int age = KeyBoardUtil.getintKeyBoard();
System.out.println("請輸入學生性別:");
int sex = KeyBoardUtil.getintKeyBoard();
Student student = new Student(name,gname,number,age,sex);
return student;
}
/**
* 向stu表中新增學生
*/
public void addStudent(Student student){
String sql = "insert into stu values(?,?,?,?,?)";
Connection connect = null;
PreparedStatement ps = null;
try {
connect = getConnection();
ps = connect.prepareStatement(sql);
ps.setString(2, student.getName());
ps.setString(3, student.getGname());
ps.setInt(1, student.getNumber());
ps.setInt(4, student.getAge());
ps.setInt(5, student.getSex());
ps.execute();
System.out.println("新增學生成功");
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (ps != null)
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
closeConnection(connect);
}
}
/**
* 顯示學生資訊
*/
public void showAllStudentMessage(){
String sql = "SELECT * FROM stu";
Connection connect = null;
PreparedStatement ps = null;
ResultSet rs = null;
try {
connect = getConnection();
ps = connect.prepareStatement(sql);
rs = ps.executeQuery();
System.out.println("姓名"+"\t"+"學號"+"\t"+"年齡"+"\t"+"年齡"+"\t"+"班級");
while(rs.next()){
String name = rs.getString("name");
String gname = rs.getString("gname");
int number = rs.getInt("number");
int age = rs.getInt("age");
int sex = rs.getInt("sex");
System.out.println(name+"\t"+number+"\t"+age+"\t"+sex+"\t"+gname);
}
} catch (SQLException e) {
e.printStackTrace();
}finally {
try {
if(rs != null)
rs.close();
if (ps != null)
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
closeConnection(connect);
}
}
/**
* 根據學生姓名檢視學生資訊
*/
public void findStudentMessageByName(){
String sql = "SELECT * FROM stu WHERE name = ?";
System.out.println("請輸入查詢的學生姓名：");
String n = KeyBoardUtil.getStringKeyBoard();
System.out.println("姓名"+"\t"+"學號"+"\t"+"年齡"+"\t"+"年齡"+"\t"+"班級");
Connection connect = null;
PreparedStatement ps = null;
ResultSet rs = null;
try {
connect = getConnection();
ps = connect.prepareStatement(sql);
ps.setString(1, n);
rs = ps.executeQuery();//執行sql查詢語句
if(rs.next()){
String name = rs.getString("name");
String gname = rs.getString("gname");
int number = rs.getInt("number");
int age = rs.getInt("age");
int sex = rs.getInt("sex");
System.out.println(name+"\t"+number+"\t"+age+"\t"+sex+"\t"+gname);
}
} catch (SQLException e) {
e.printStackTrace();
}finally {
try {
if (ps != null)
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
closeConnection(connect);
}
}
}
package cn.sxb.day11;
import java.io.ObjectInputStream.GetField;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import com.mysql.jdbc.PreparedStatement;
public class GradeDemo extends UtilDB {
public static void main(String[] args) {
GradeDemo gb = new GradeDemo();
// gb.createGradeTable();
// gb.addGrade(gb.addGradebyKeyBoard());
// gb.printMessageAllStudent();
// gb.createView();
gb.showGradeMessage();
}
/**
* 建立Grade表
*/
public void createGradeTable() {
Connection connect = null;
Statement statement = null;
String sql = "create table grade(gradeNumber int(11) not null primary key,gradeName varchar(10) not null)";
try {
connect = getConnection();
statement = connect.createStatement();
statement.execute(sql);
} catch (SQLException e) {
e.printStackTrace();
} finally {
if (statement != null)
try {
statement.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
closeConnection(connect);
}
/**
* 鍵盤輸入班級名和編號
* @return
*/
public Grade addGradebyKeyBoard(){
System.out.println("請輸入班級名稱：");
String gradeName = KeyBoardUtil.getStringKeyBoard();
System.out.println("請輸入班級編號：");
int gradeNumber = KeyBoardUtil.getintKeyBoard();
Grade g = new Grade(gradeName,gradeNumber);
return g;
}
/**
* 向grade表中新增班級
* @param g
*/
public void addGrade(Grade g){
Connection connect = null;
java.sql.PreparedStatement ps = null;
String sql = "insert into grade values(?,?)";
try {
connect = getConnection();
ps = connect.prepareStatement(sql);
ps.setString(2, g.gradeName);
ps.setInt(1, g.gradeNumber);
ps.execute();
} catch (SQLException e) {
e.printStackTrace();
}finally{
try {
if(ps != null)
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
closeConnection(connect);
}
/**
* 顯示班級
*/
public void printMessageAllGrade(){
String sql = "SELECT * FROM grade";
Connection connect = null;
java.sql.PreparedStatement ps = null;
ResultSet rs = null;
try {
connect = getConnection();
ps = connect.prepareStatement(sql);
rs = ps.executeQuery();
System.out.println("班級名稱"+"\t"+"班級編號");
while(rs.next()){
int gradeNumber = rs.getInt("gradeNumber");
String gradeName = rs.getString("gradeName");
System.out.println(gradeName+"\t"+gradeNumber);
}
} catch (SQLException e) {
e.printStackTrace();
}finally {
try {
if(rs != null)
rs.close();
if (ps != null)
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
closeConnection(connect);
}
}
/**
* 建立檢視
*/
public void createView(){
// String sql = "create view s_g(gradeName,gradeNumber,name,number,age,sex)"
// + "as select gradeName,gradeNumber,name,number,age,sex "
// + "from grade,stu"
// + "where gradeName = gname";
String sql = "create view vv as select * from grade,stu where gradeName = gname";
// String ss = "select * from ss";
Connection connect = null;
java.sql.PreparedStatement ps = null;
String s = "SELECT * FROM vv WHERE gradeName = ?";
System.out.println("請輸入查詢的班級名稱：");
String n = KeyBoardUtil.getStringKeyBoard();
System.out.println("您要查詢的班級是：");
System.out.println("班級"+"\t"+"編號"+"\t姓名"+"\t學號"+"\t年齡"+"\t性別");
ResultSet rs = null;
try {
connect = getConnection();
ps = connect.prepareStatement(sql);
ps.execute();
ps = connect.prepareStatement(s);
ps.setString(1, n);
rs = ps.executeQuery();//執行sql查詢語句
while(rs.next()){
int gradeNumber = rs.getInt("gradeNumber");
String gradeName = rs.getString("gradeName");
String name = rs.getString("name");
int number = rs.getInt("number");
int age = rs.getInt("age");
int sex = rs.getInt("sex");
System.out.println(gradeName+"\t"+gradeNumber+"\t"+name+"\t"+number+"\t"+age+"\t"+sex);
}
} catch (SQLException e) {
e.printStackTrace();
}finally {
if (ps != null)
try {
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
closeConnection(connect);
}
/**
* 根據班級名稱查詢班級資訊
*/
public void showGradeMessage(){
String sql = "SELECT * FROM grade,stu WHERE gradeName = ?";
System.out.println("請輸入查詢的班級名稱：");
String n = KeyBoardUtil.getStringKeyBoard();
System.out.println("您要查詢的班級是：");
System.out.println("班級"+"\t"+"編號"+"\t姓名"+"\t學號"+"\t年齡"+"\t性別");
Connection connect = null;
java.sql.PreparedStatement ps = null;
ResultSet rs = null;
try {
connect = getConnection();
ps = connect.prepareStatement(sql);
ps.setString(1, n);
rs = ps.executeQuery();//執行sql查詢語句
while(rs.next()){
int gradeNumber = rs.getInt("gradeNumber");
String gradeName = rs.getString("gradeName");
String name = rs.getString("name");
int number = rs.getInt("number");
int age = rs.getInt("age");
int sex = rs.getInt("sex");
System.out.println(gradeName+"\t"+gradeNumber+"\t"+name+"\t"+number+"\t"+age+"\t"+sex);
}
} catch (SQLException e) {
e.printStackTrace();
}finally {
try {
if (ps != null)
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
closeConnection(connect);
}
}
}
package cn.sxb.day11;
import java.util.InputMismatchException;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
GradeDemo gb = new GradeDemo();
StudentDemo sd = new StudentDemo();
System.out.println("==歡迎進入班級管理系統==");
for (;;) {
System.out.println("==【班級管理系統主介面】==");
System.out.println("1 班級管理, 2 學生管理, 3 退出");
int num = 0;
boolean a = true;
System.out.println("<輸入操作命令>");
while (a) {
try {
Scanner scanner = new Scanner(System.in);
num = scanner.nextInt();
a = false;
} catch (InputMismatchException e) {
String message = e.getMessage();
System.out.println("輸入格式錯誤！\t請重新輸入正確格式");
a = true;
}
}
switch (num) {
case 1:
System.out.println("==班級管理==");
System.out.println("1.建立班級, 2 顯示班級, 3 檢視班級學生, 4返回班級系統主介面");
System.out.println("<輸入操作命令>");
for (;;) {
Scanner scanner = new Scanner(System.in);
int numb = scanner.nextInt();
if (numb == 4) {
break;
}
switch (numb) {
case 1:
gb.addGrade(gb.addGradebyKeyBoard());
break;
case 2:
gb.printMessageAllGrade();
break;
case 3:
gb.createView();
}
System.out.println("<輸入操作命令>");
}
break;
case 2:
System.out.println("==學生管理==");
System.out.println("新增學生, 2 顯示學生 , 3 查詢學生 , 4 返回班級系統主介面");
for (;;) {
Scanner scanner = new Scanner(System.in);
int numbe = scanner.nextInt();
if (numbe == 4) {
break;
}
switch (numbe) {
case 1:
sd.addStudent(sd.addStudentMessageByKeyBoard());
break;
case 2:
sd.showAllStudentMessage();
break;
case 3:
sd.findStudentMessageByName();
}
System.out.println("<輸入操作命令>");
}
break;
case 3:
System.out.println("您已退出本系統");
System.exit(0);
}
}
}
}
對上面的系統進行分層：
package cn.GradeMangerSystem.bean;
public class Grade {
private String gradeName;
private int gradeNumber;//班級編號
public Grade(String gradeName, int gradeNumber) {
this.gradeName = gradeName;
this.gradeNumber = gradeNumber;
}
public String getGradeName() {
return gradeName;
}
public void setGradeName(String gradeName) {
this.gradeName = gradeName;
}
public int getGradeNumber() {
return gradeNumber;
}
public void setGradeNumber(int gradeNumber) {
this.gradeNumber = gradeNumber;
}
}
package cn.GradeMangerSystem.bean;
public class Student {
private String name;
private String gname;//班級編號
private int number;
private int age;
private int sex;
public Student(String name, String gname, int number, int age, int sex) {
this.name = name;
this.gname = gname;
this.number = number;
this.age = age;
this.sex = sex;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getGname() {
return gname;
}
public void setGname(String gname) {
this.gname = gname;
}
public int getNumber() {
return number;
}
public void setNumber(int number) {
this.number = number;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public int getSex() {
return sex;
}
public void setSex(int sex) {
this.sex = sex;
}
}
package cn.GradeMangerSystem.utils;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class KeyBoardUtil {
/**
* 使用io流，獲取從鍵盤輸入到程式。使用Input(從外部裝置到程式為輸入，程式到外部裝置為輸出)；
* System.in(out)標準系統輸入輸出中，不需要關閉流,由系統自動關閉。否則在後面測試類中會回報流關閉錯誤
*/
public static String getStringKeyBoard() {
String name = "";
InputStreamReader isr = null;
BufferedReader br = null;
try {
isr = new InputStreamReader(System.in);
br = new BufferedReader(isr);
name = br.readLine();
} catch (IOException e) {
e.printStackTrace();
}
return name;
}
public static int getintKeyBoard() {
while (true) {
int number = 0;
InputStreamReader isr = null;
BufferedReader br = null;
try {
isr = new InputStreamReader(System.in);
br = new BufferedReader(isr);
String s = br.readLine();// 在緩衝流中用readLine()，每行讀成String型。在轉換成int型
number = Integer.parseInt(s);
return number;
} catch (IOException e) {
e.printStackTrace();
} catch (NumberFormatException a) {
System.out.println("請輸入正確數值格式");
}
}
}
}
package cn.GradeMangerSystem.contrl;
import cn.GradeMangerSystem.bean.Grade;
import cn.GradeMangerSystem.utils.KeyBoardUtil;
public class GradeContrl {
/**
* 單例模式
*/
private static GradeContrl gc = null;
public static GradeContrl getInstance(){
if(gc == null){
gc = new GradeContrl();
}
return gc;
}
private GradeContrl(){
}
/**
* 鍵盤錄入班級資訊
*/
public Grade addGradebyKeyBoard(){
System.out.println("請輸入班級名稱：");
String gradeName = KeyBoardUtil.getStringKeyBoard();
System.out.println("請輸入班級編號：");
int gradeNumber = KeyBoardUtil.getintKeyBoard();
Grade g = new Grade(gradeName,gradeNumber);
return g;
}
}
package cn.GradeMangerSystem.contrl;
import cn.GradeMangerSystem.bean.Student;
import cn.GradeMangerSystem.utils.KeyBoardUtil;
public class StudentContrl {
/**
* 單例模式
*/
private static StudentContrl sc = null;
public static StudentContrl getInstance(){
if(sc == null){
sc = new StudentContrl();
}
return sc;
}
private StudentContrl(){}
/**
* 鍵盤錄入學生資訊
*/
public Student addStudentMessageByKeyBoard(){
System.out.println("請輸入學生姓名:");
String name = KeyBoardUtil.getStringKeyBoard();
System.out.println("請輸入學生班級:");
String gname = KeyBoardUtil.getStringKeyBoard();
System.out.println("請輸入學生學號:");
int number = KeyBoardUtil.getintKeyBoard();
System.out.println("請輸入學生年齡:");
int age = KeyBoardUtil.getintKeyBoard();
System.out.println("請輸入學生性別:");
int sex = KeyBoardUtil.getintKeyBoard();
Student student = new Student(name,gname,number,age,sex);
return student;
}
}
package cn.GradeMangerSystem.model;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class ConnectDB {
private static final String URL = "jdbc:mysql://192.168.5.7:3306/db1606";
private static final String USER = "test";
private static final String PASSWORD = "123321";
/**
* 構造方法載入驅動
*/
public ConnectDB() {
try {
Class.forName("com.mysql.jdbc.Driver");// 載入mysql驅動
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
/**
* 建立連線資料庫
*/
public Connection getConnection() {
Connection connect = null;
try {
connect = DriverManager.getConnection(URL, USER, PASSWORD);// 試圖建立到給定資料庫URL的連線
// if (connect == null) {
// System.out.println("資料庫連線失敗");
// } else {
// System.out.println("資料庫連線成功");
// }
} catch (SQLException e) {
e.printStackTrace();
}
return connect;
}
/**
* 關閉資料庫連線
*/
public void closeConnection(Connection connect) {
try {
if (connect != null)
connect.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
package cn.GradeMangerSystem.model;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import cn.GradeMangerSystem.bean.Grade;
import cn.GradeMangerSystem.utils.KeyBoardUtil;
public class GradeDemo extends ConnectDB {
public static void main(String[] args) {
// GradeDemo gb = new GradeDemo();
// gb.createGradeTable();
// gb.addGrade(gb.addGradebyKeyBoard());
// gb.printMessageAllStudent();
// gb.createView();
// gb.showGradeMessage();
}
/**
* 單例模式
*/
private static GradeDemo gb = null;
public static GradeDemo getInstance(){
if(gb == null){
gb = new GradeDemo();
}
return gb;
}
private GradeDemo(){}
/**
* 建立Grade表
*/
public void createGradeTable() {
Connection connect = null;
Statement statement = null;
/**
* 建立表時，將gradeNumber設定主鍵，是避免gradeNumber重複(重複會報錯)
*/
String sql = "create table grade(gradeNumber int(11) not null primary key,gradeName varchar(10) not null)";
try {
connect = getConnection();
statement = connect.createStatement();
statement.execute(sql);
} catch (SQLException e) {
e.printStackTrace();
} finally {
if (statement != null)
try {
statement.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
closeConnection(connect);
}
/**
* 向grade表中新增班級
* @param g
*/
public void addGrade(Grade g){
Connection connect = null;
java.sql.PreparedStatement ps = null;
String sql = "insert into grade values(?,?)";
try {
connect = getConnection();
ps = connect.prepareStatement(sql);
ps.setString(2, g.getGradeName());
ps.setInt(1, g.getGradeNumber());
/**
* 在這裡原來g.gradeName和g.gradeNumber是呼叫構造方法的屬性，所以在用mvc模式分層時，
* 會報錯(需將班級屬性改為public).而mvc的規則之一是：每個屬性對應有get()和set()方法
*/
// ps.setString(2, g.gradeName);
// ps.setInt(1, g.gradeNumber);
ps.execute();
} catch (SQLException e) {
e.printStackTrace();
}finally{
try {
if(ps != null)
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
closeConnection(connect);
}
/**
* 顯示班級
*/
public void printMessageAllGrade(){
String sql = "SELECT * FROM grade";
Connection connect = null;
java.sql.PreparedStatement ps = null;
ResultSet rs = null;
try {
connect = getConnection();
ps = connect.prepareStatement(sql);
rs = ps.executeQuery();
System.out.println("班級名稱"+"\t"+"班級編號");
while(rs.next()){
int gradeNumber = rs.getInt("gradeNumber");
String gradeName = rs.getString("gradeName");
System.out.println(gradeName+"\t"+gradeNumber);
}
} catch (SQLException e) {
e.printStackTrace();
}finally {
try {
if(rs != null)
rs.close();
if (ps != null)
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
closeConnection(connect);
}
}
/**
* 建立檢視，在檢視中檢視
public void createView(){
// String sql = "create view s_g(gradeName,gradeNumber,name,number,age,sex)"
// + "as select gradeName,gradeNumber,name,number,age,sex "
// + "from grade,stu"
// + "where gradeName = gname";
String sql = "create view vv as select * from grade,stu where gradeName = gname";
// String ss = "select * from ss";
Connection connect = null;
java.sql.PreparedStatement ps = null;
String s = "SELECT * FROM vv WHERE gradeName = ?";
System.out.println("請輸入查詢的班級名稱：");
String n = KeyBoardUtil.getStringKeyBoard();
System.out.println("您要查詢的班級是：");
System.out.println("班級"+"\t"+"編號"+"\t姓名"+"\t學號"+"\t年齡"+"\t性別");
ResultSet rs = null;
try {
connect = getConnection();
ps = connect.prepareStatement(sql);
ps.execute();
ps = connect.prepareStatement(s);
ps.setString(1, n);
rs = ps.executeQuery();//執行sql查詢語句
while(rs.next()){
int gradeNumber = rs.getInt("gradeNumber");
String gradeName = rs.getString("gradeName");
String name = rs.getString("name");
int number = rs.getInt("number");
int age = rs.getInt("age");
int sex = rs.getInt("sex");
System.out.println(gradeName+"\t"+gradeNumber+"\t"+name+"\t"+number+"\t"+age+"\t"+sex);
}
} catch (SQLException e) {
e.printStackTrace();
}finally {
if (ps != null)
try {
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
closeConnection(connect);
}*/
/**
* 根據班級名稱查詢班級資訊
*/
public void showGradeMessage(){
String sql = "SELECT * FROM grade,stu WHERE gradeName = ?";
System.out.println("請輸入查詢的班級名稱：");
String n = KeyBoardUtil.getStringKeyBoard();
System.out.println("您要查詢的班級是：");
System.out.println("班級"+"\t"+"編號"+"\t姓名"+"\t學號"+"\t年齡"+"\t性別");
Connection connect = null;
java.sql.PreparedStatement ps = null;
ResultSet rs = null;
try {
connect = getConnection();
ps = connect.prepareStatement(sql);
ps.setString(1, n);
rs = ps.executeQuery();//執行sql查詢語句
while(rs.next()){
int gradeNumber = rs.getInt("gradeNumber");
String gradeName = rs.getString("gradeName");
String name = rs.getString("name");
int number = rs.getInt("number");
int age = rs.getInt("age");
int sex = rs.getInt("sex");
System.out.println(gradeName+"\t"+gradeNumber+"\t"+name+"\t"+number+"\t"+age+"\t"+sex);
}
} catch (SQLException e) {
e.printStackTrace();
}finally {
try {
if (ps != null)
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
closeConnection(connect);
}
}
}
package cn.GradeMangerSystem.model;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import cn.GradeMangerSystem.bean.Student;
import cn.GradeMangerSystem.utils.KeyBoardUtil;
public class StudentDemo extends ConnectDB{
public static void main(String[] args) {
StudentDemo sd = new StudentDemo();
// sd.createGradeTable();
// sd.addStudent(sd.addStudentMessageByKeyBoard());
// sd.showAllStudentMessage();
// sd.findStudentMessageByName();
}
/**
* 單例模式
*/
private static StudentDemo sd = null;
public static StudentDemo getInstance(){
if(sd == null){
sd = new StudentDemo();
}
return sd;
}
private StudentDemo(){}
/**
* 建立stu表
*/
public void createGradeTable() {
Connection connect = null;
Statement statement = null;
String sql = "create table stu (" + "number int(11) not null primary key," // 主鍵
+ "name varchar(10) not null," // 姓名
+ "gname varchar(10) not null," // 班級名
+ "age int(3) not null," // 年齡
+ "sex int(1) not null" // 性別
+ ")";
try {
connect = getConnection();
statement = connect.createStatement();
statement.execute(sql);
} catch (SQLException e) {
e.printStackTrace();
} finally {
if (statement != null)
try {
statement.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
closeConnection(connect);
}
/**
* 向stu表中新增學生
*/
public void addStudent(Student student){
String sql = "insert into stu values(?,?,?,?,?)";
Connection connect = null;
PreparedStatement ps = null;
try {
connect = getConnection();
ps = connect.prepareStatement(sql);
ps.setString(2, student.getName());
ps.setString(3, student.getGname());
ps.setInt(1, student.getNumber());
ps.setInt(4, student.getAge());
ps.setInt(5, student.getSex());
ps.execute();
System.out.println("新增學生成功");
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (ps != null)
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
closeConnection(connect);
}
}
/**
* 顯示學生資訊
*/
public void showAllStudentMessage(){
String sql = "SELECT * FROM stu";
Connection connect = null;
PreparedStatement ps = null;
ResultSet rs = null;
try {
connect = getConnection();
ps = connect.prepareStatement(sql);
rs = ps.executeQuery();
System.out.println("姓名"+"\t"+"學號"+"\t"+"年齡"+"\t"+"年齡"+"\t"+"班級");
while(rs.next()){
String name = rs.getString("name");
String gname = rs.getString("gname");
int number = rs.getInt("number");
int age = rs.getInt("age");
int sex = rs.getInt("sex");
System.out.println(name+"\t"+number+"\t"+age+"\t"+sex+"\t"+gname);
}
} catch (SQLException e) {
e.printStackTrace();
}finally {
try {
if(rs != null)
rs.close();
if (ps != null)
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
closeConnection(connect);
}
}
/**
* 根據學生姓名檢視學生資訊
*/
public void findStudentMessageByName(){
String sql = "SELECT * FROM stu WHERE name = ?";
System.out.println("請輸入查詢的學生姓名：");
String n = KeyBoardUtil.getStringKeyBoard();
System.out.println("姓名"+"\t"+"學號"+"\t"+"年齡"+"\t"+"年齡"+"\t"+"班級");
Connection connect = null;
PreparedStatement ps = null;
ResultSet rs = null;
try {
connect = getConnection();
ps = connect.prepareStatement(sql);
ps.setString(1, n);
rs = ps.executeQuery();//執行sql查詢語句
if(rs.next()){
String name = rs.getString("name");
String gname = rs.getString("gname");
int number = rs.getInt("number");
int age = rs.getInt("age");
int sex = rs.getInt("sex");
System.out.println(name+"\t"+number+"\t"+age+"\t"+sex+"\t"+gname);
}
} catch (SQLException e) {
e.printStackTrace();
}finally {
try {
if (ps != null)
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
closeConnection(connect);
}
}
}
package cn.GradeMangerSystem.view;
import java.util.InputMismatchException;
import java.util.Scanner;
import cn.GradeMangerSystem.contrl.GradeContrl;
import cn.GradeMangerSystem.contrl.StudentContrl;
import cn.GradeMangerSystem.model.GradeDemo;
import cn.GradeMangerSystem.model.StudentDemo;
public class Test {
public static void main(String[] args) {
System.out.println("==歡迎進入班級管理系統==");
for (;;) {
System.out.println("==【班級管理系統主介面】==");
System.out.println("1 班級管理, 2 學生管理, 3 退出");
int num = 0;
boolean a = true;
System.out.println("<輸入操作命令>");
while (a) {
try {
Scanner scanner = new Scanner(System.in);
num = scanner.nextInt();
a = false;
} catch (InputMismatchException e) {
String message = e.getMessage();
System.out.println("輸入格式錯誤！\n請重新輸入正確格式：");
a = true;
}
}
switch (num) {
case 1:
System.out.println("==班級管理==");
System.out.println("1.建立班級, 2 顯示班級, 3 檢視班級學生, 4返回班級系統主介面");
System.out.println("<輸入操作命令>");
for (;;) {
Scanner scanner = new Scanner(System.in);
int numb = scanner.nextInt();
if (numb == 4) {
break;
}
switch (numb) {
case 1:
GradeDemo.getInstance().addGrade(GradeContrl.getInstance().addGradebyKeyBoard());
break;
case 2:
GradeDemo.getInstance().printMessageAllGrade();
break;
case 3:
GradeDemo.getInstance().showGradeMessage();
}
System.out.println("<輸入操作命令>");
}
break;
case 2:
System.out.println("==學生管理==");
System.out.println("1.新增學生, 2 顯示學生 , 3 查詢學生 , 4 返回班級系統主介面");
for (;;) {
Scanner scanner = new Scanner(System.in);
int numbe = scanner.nextInt();
if (numbe == 4) {
break;
}
switch (numbe) {
case 1:
StudentDemo.getInstance().addStudent(StudentContrl.getInstance().addStudentMessageByKeyBoard());
break;
case 2:
StudentDemo.getInstance().showAllStudentMessage();
break;
case 3:
StudentDemo.getInstance().findStudentMessageByName();
}
System.out.println("<輸入操作命令>");
}
break;
case 3:
System.out.println("您已退出本系統");
System.exit(0);
}
}
}
}