使用JDBC怎么实现一个学生管理系统
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1、学生类
package manage;
import java.util.Date;
public class Student {
private int id;
private int age;
private String sex;
private String name;
private Date dateCreated;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Date getDateCreated() {
return dateCreated;
}
public void setDateCreated(Date dateCreated) {
this.dateCreated = dateCreated;
}
public Student() {
}
public Student(int age, String sex, String name) {
this.age = age;
this.sex = sex;
this.name = name;
}
public Student(int id, int age, String sex, String name) {
this.id = id;
this.age = age;
this.sex = sex;
this.name = name;
}
@Override
public String toString() {
return "Student{" +
"id=" + id +
", age=" + age +
", sex='" + sex + '\'' +
", name='" + name + '\'' +
", dateCreated=" + dateCreated +
'}';
}
}2、jdbc工具类
package manage;
import java.io.IOException;
import java.sql.*;
import java.util.Properties;
/**
* @author fanxf
* @since 2018/4/27 11:06
*/
//数据库的工具类
public class JdbcUtils {
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();
}
}
}
}3、代码
package manage;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Scanner;
/**
* @author fanxf
* @since 2018/4/27 17:06
*/
public class ManageSystem {
private static Connection conn = null;
private static PreparedStatement ps = null;
private static ResultSet rs = null;
/**
* 添加学生数据
*
* @param student
* @return
*/
public static int addStudent(Student student) {
conn = JdbcUtils.getConnection();
int result = 0;
try {
ps = conn.prepareStatement("INSERT INTO student (age, sex, `name`, dateCreated) VALUES (?, ?, ?, now())");
ps.setInt(1, student.getAge()); //设置第一个参数
ps.setString(2, student.getSex()); //设置第二个参数
ps.setString(3, student.getName()); //设置第三个参数
result = ps.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally {
JdbcUtils.release(null, ps, conn); //关闭连接
}
return result;
}
public void add() {
Scanner scan = new Scanner(System.in);
System.out.println("请输入学生年龄");
int age = scan.nextInt();
System.out.println("请输入学生性别");
String sex = scan.next();
System.out.println("请输入学生姓名");
String name = scan.next();
Student s = new Student(age, sex, name);
int flag = addStudent(s);
if (flag > 0) {
System.out.println("添加成功");
} else {
System.out.println("添加失败");
}
}
/**
* 修改
*
* @param student
* @return
*/
public static int updateStudent(Student student) {
conn = JdbcUtils.getConnection();
int result = 0;
try {
ps = conn.prepareStatement("UPDATE student SET age = ?, sex = ?, `name` = ? WHERE id = ?");
ps.setInt(1, student.getAge()); //设置第一个参数
ps.setString(2, student.getSex()); //设置第二个参数
ps.setString(3, student.getName()); //设置第三个参数
ps.setInt(4, student.getId());
result = ps.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally {
JdbcUtils.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("请输入学生年龄");
int age = scan.nextInt();
System.out.println("请输入学生性别");
String sex = scan.next();
System.out.println("请输入学生姓名");
String name = scan.next();
Student s = new Student(id, age, sex, name);
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
*/
public static int deleteStudent(int id) {
conn = JdbcUtils.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 {
JdbcUtils.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) {
System.out.println("************ 欢迎进入学生管理系统 *************");
ManageSystem ms = new ManageSystem();
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:
System.out.println();
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;
}
}
}
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