这个是java连接mysql数据库的一个简单学生系统，通过jdbc连接数据库。
工具类
JDBCuntils.
package Student;
import java.io.IOException;
import java.sql.*;
import java.util.Properties;
//数据库的工具类
public class JDBCuntils {
private static String driver = "";
private static String url = "";
private static String user = "";
private static String password = "";
static {
Properties p = new Properties();
try {
p.load(Thread.currentThread().getContextClassLoader().getResourceAsStream("db.properties"));
} catch (IOException e) {
e.printStackTrace();
}
driver = p.getProperty("driver");
url = p.getProperty("url");
user = p.getProperty("user");
password = p.getProperty("password");
/*try {
Class.forName(driver);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}*/
}
public static Connection getConnection() {
try {
return DriverManager.getConnection(url, user, password);
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}
//释放的时候要从小到大释放
//Connection -> Statement --> Resultset
public static void release(ResultSet rs, Statement stmt, Connection conn) {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (stmt != null) {
try {
stmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
数据库配置文件(这个是连接你自己的数据库的信息，在包里创建就好)
db.properties
driver=com.mysql.jdbc.Driver url=jdbc:mysql://localhost:3306/db3 user=root password=1767737316. #<!-- u914Du7F6Eu521Du59CBu5316u5927u5C0F --> initialSize=6 #<!-- u914Du7F6Eu521Du59CBu5316u6700u5927u8FDEu63A5u6570 --> maxActive=20 #<!-- u914Du7F6Eu521Du59CBu5316u6700u5C0Fu8FDEu63A5u6570 --> minIdle=3 #<!-- u914Du7F6Eu83B7u53D6u8FDEu63A5u7B49u5F85u8D85u65F6u7684u65F6u95F4,1u5206u949Fu5355u4F4Du6BEBu79D2 --> maxWait=60000
Student.java
package Student;
import java.util.Date;
public class Student {
private int id;
private String name;
private int score;
public Student(int id, String name,int score) {
this.id = id;
this.name = name;
this.score = score;
}
public Student() {
}
public String toString() {
return "Student{" +
"name="" + id + """ +
", age=" + name +
", sex="" + score + """ +
"}";
}
public int getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getScore() {
return score;
}
public void setScore(Integer score) {
this.score = score;
}
}
Studentmannger.java
package Student;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Scanner;
/**
* @author fanxf
* @since 2018/4/27 17:06
*/
public class Studentmannger {
private static Connection conn = null;
private static PreparedStatement ps = null;
private static ResultSet rs = null;
/**
* 添加学生数据
*
* @param student
* @return
* @throws SQLException
*/
public static int addStudent(Student student) {
conn = JDBCuntils.getConnection();
int result = 0;
try {
ps = conn.prepareStatement("INSERT INTO student (id,`name`,score) VALUES (?, ?, ?)");
ps.setInt(1, student.getId()); //设置第一个参数
ps.setString(2, student.getName()); //设置第二个参数
ps.setInt(3, student.getScore()); //设置第三个参数
result = ps.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally {
JDBCuntils.release(null, ps, conn); //关闭连接
}
return result;
}
public void add() {
Scanner scan = new Scanner(System.in);
System.out.println("请输入学生学号");
int id = scan.nextInt();
System.out.println("请输入学生姓名");
String name = scan.next();
System.out.println("请输入学生成绩");
int score = scan.nextInt();
Student s = new Student(id, name, score);
int flag = addStudent(s);
if (flag > 0) {
System.out.println("添加成功");
} else {
System.out.println("添加失败");
}
}
/**1
*
* 修改
*
* @param student
* @return
*/
public static int updateStudent(Student student) {
conn = JDBCuntils.getConnection();
int result = 0;
try {
ps = conn.prepareStatement("UPDATE student SET id = ?, `name` = ?, score = ? WHERE id = ?");
ps.setInt(1, student.getId()); //设置第一个参数
ps.setString(2, student.getName()); //设置第二个参数
ps.setInt(3, student.getScore()); //设置第三个参数
ps.setInt(4, student.getId());
result = ps.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally {
JDBCuntils.release(null, ps, conn); //关闭连接
}
return result;
}
public void update() {
Scanner scan = new Scanner(System.in);
System.out.println("请输入学生id");
int id = scan.nextInt();
System.out.println("请输入学生姓名");
scan.nextLine();
String name = scan.nextLine();
System.out.println("请输入学生成绩");
int score = scan.nextInt();
Student s = new Student(id, name, score );
int flag = updateStudent(s);
if (flag > 0) {
System.out.println("更新成功");
} else {
System.out.println("更新失败");
}
}
/**
* 删除
*
* @param id
* @return
* @throws SQLException
*/
public static void select() throws SQLException {
Scanner scan = new Scanner(System.in);
conn = JDBCuntils.getConnection();
int n;
String sql = "select * from student where id=?";
PreparedStatement ps = conn.prepareStatement(sql);
System.out.println("请输入要查询的学号");
n = scan.nextInt();
ps.setInt(1, n);
ResultSet rs = ps.executeQuery();
//将sql语句传至数据库，返回的值为一个字符集用一个变量接收
while(rs.next()){ //next（）获取里面的内容
System.out.println(rs.getInt(1)+" "+rs.getString(2)+" "+rs.getInt(3));
//getString（n）获取第n列的内容
//数据库中的列数是从1开始的
}
}
public static int deleteStudent(int id) {
conn = JDBCuntils.getConnection();
int result = 0;
try {
ps = conn.prepareStatement("DELETE FROM student WHERE id = ?");
ps.setInt(1, id); //设置第一个参数
result = ps.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally {
JDBCuntils.release(null, ps, conn); //关闭连接
}
return result;
}
public void delete() {
Scanner scan = new Scanner(System.in);
System.out.println("请输入学生id");
int id = scan.nextInt();
int flag = deleteStudent(id);
if (flag > 0) {
System.out.println("删除成功");
} else {
System.out.println("删除失败");
}
}
public static void main(String[] args) throws SQLException {
System.out.println("************ 欢迎进入学生管理系统 *************");
Studentmannger ms = new Studentmannger();
boolean b = true;
while (b) {
System.out.println("你想进行以下哪项操作");
System.out.println("1、添加学生 2、更新学生数据 3、学生信息查询 4、删除学生 0、退出");
Scanner scan = new Scanner(System.in);
int i = scan.nextInt();
switch (i) {
case 1:
ms.add();
break;
case 2:
ms.update();
break;
case 3:
ms.select();
break;
case 4:
ms.delete();
break;
default:
System.out.println("没有该操作选项,请重新来过！");
main(args);
break;
}
}
}
}
工程目录：
运行截图：
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原文链接：https://www.cnblogs.com/wjingbo/p/15455941.html
