用java实现的简单学生管理系统并和数据库的交互

一个简单的学生管理系统只进行了和数据库的连接，实现了对数据库的CRUD，目前没有学javaweb，后期将对齐进行优化实现前端和后端的交互。

代码里面用到的JDBCUtils是写的一个对JDBC工具类，在我的上一篇文章中有详细介绍。

public class StudentTest {
public static Scanner sc = new Scanner(System.in);
public static void main(String[] args) {
System.out.println("=======================欢迎使用学生管理系统================================");
outer :while(true) {
System.out.println("请输入你要选择的操作：");
System.out.println("1、添加学生");
System.out.println("2、删除学生");
System.out.println("3、修改学生");
System.out.println("4、查询单个学生");
System.out.println("5、查询所有学生");
System.out.println("6、退出系统");
int key = sc.nextInt();
switch (key) {
case 1:
try {
//添加学生方法
addStudent();
} catch (SQLException e) {
e.printStackTrace();
}
break;
case 2:
try {
//删除学生方法
deleteStudent();
} catch (SQLException e) {
e.printStackTrace();
}
break;
case 3:
try {
修改学生方法
updateStudent();
} catch (SQLException e) {
e.printStackTrace();
}
break;
case 4:
try {
//查询单个学生方法
getOneStudent();
} catch (Exception e) {
e.printStackTrace();
}
break;
case 5:
try {
//查询所有学生方法
gwtAllStudent();
} catch (Exception e) {
e.printStackTrace();
}
break;
case 6:

break outer;

default:
System.out.println("你输入的操作有误，请重新输入！");
break;
}
}
System.out.println("=======================谢谢使用学生管理系统================================");

}

public static void gwtAllStudent() throws Exception {
Connection conn = JDBCUtils.getConnection();
Statement stmt = conn.createStatement();
String sql = "select * from student";
ResultSet rs = stmt.executeQuery(sql);
while(rs.next()) {
System.out.print("学生学号：" + rs.getString("id") + "\t");
System.out.print("学生姓名：" + rs.getString("sname") + "\t");
System.out.print("学生年龄：" + rs.getString("sage") + "\t");
System.out.print("学生性别：" + rs.getString("gender") + "\t");
System.out.print("学生分数：" + rs.getString("score") + "\t");
System.out.println("学生生日：" + rs.getString("brithday"));
}

JDBCUtils.close(conn, stmt, rs);
}

public static void getOneStudent() throws Exception {
System.out.println("请输入你要查询的学生姓名");
String sname = sc.next();
Connection conn = JDBCUtils.getConnection();
Statement stmt = conn.createStatement();
String sql = "select * from student where sname= '" + sname + "'";
ResultSet rs = stmt.executeQuery(sql);
if (rs.next()) {
System.out.print("学生学号：" + rs.getString("id") + "\t");
System.out.print("学生姓名：" + rs.getString("sname") + "\t");
System.out.print("学生年龄：" + rs.getString("sage") + "\t");
System.out.print("学生性别：" + rs.getString("gender") + "\t");
System.out.print("学生分数：" + rs.getString("score") + "\t");
System.out.println("学生生日：" + rs.getString("brithday"));
}else {
System.out.println("没有查到学生信息");
}
JDBCUtils.close(conn, stmt, rs);
}

public static void updateStudent() throws SQLException {
System.out.println("请输入你要修改的学生姓名");
String sname = sc.next();
Connection conn = JDBCUtils.getConnection();
Statement stmt = conn.createStatement();
String sql = "select * from student where sname= '" + sname + "'";
ResultSet rs = stmt.executeQuery(sql);
if (rs.next()) {
System.out.print("学生学号：" + rs.getString("id") + "\t");
System.out.print("学生姓名：" + rs.getString("sname") + "\t");
System.out.print("学生年龄：" + rs.getString("sage") + "\t");
System.out.print("学生性别：" + rs.getString("gender") + "\t");
System.out.print("学生分数：" + rs.getString("score") + "\t");
System.out.println("学生生日：" + rs.getString("brithday"));

System.out.println("请输入你要修改的学生信息具体项：");
System.out.println("1、修改学生年龄");
System.out.println("2、修改学生性别");
System.out.println("3、修改学生分数");
System.out.println("4、修改学生生日");
int key = sc.nextInt();
switch (key) {
case 1:
System.out.println("请输入要修改的学生年龄");
int sage = sc.nextInt();
sql = "update student set sage = " + sage + " where sname = '" + sname + "'";
int b = stmt.executeUpdate(sql);
if (b > 0) {
System.out.println("修改学生年龄成功");
} else {
System.out.println("修改学生年龄失败");
}
break;
case 2:
System.out.println("请输入你要修改的学生性别");
String gender = sc.next();
sql = "update student set gender = '" + gender + "'where sname = '" + sname + "'";
b = stmt.executeUpdate(sql);
if (b > 0) {
System.out.println("修改学生性别成功");
} else {
System.out.println("修改学生性别失败");
}
break;
case 3:
System.out.println("请输入你要修改的学生分数");
double score = sc.nextDouble();
sql = "update student set score = " + score + "where sname = '" + sname + "'";
b = stmt.executeUpdate(sql);
if (b > 0) {
System.out.println("修改学生分数成功");
} else {
System.out.println("修改学生分数失败");
}

break;
case 4:
System.out.println("请输入你要修改的学生生日");
String brithday = sc.next();
sql = "update student set brithday = '" + brithday + "'where sname = '" + sname + "'";
b = stmt.executeUpdate(sql);
if (b > 0) {
System.out.println("修改学生生日成功");
} else {
System.out.println("修改学生生日失败");
}
break;

default:
break;
}
} else {
System.out.println("没有查到学生信息");
}
JDBCUtils.close(conn, stmt, rs);

}

public static void deleteStudent() throws SQLException {
System.out.println("请输入你要删除的学生姓名");
String sname = sc.next();
Connection conn = JDBCUtils.getConnection();
Statement stmt = conn.createStatement();
String sql = "delete from student where sname = '" + sname + "'";
int b = stmt.executeUpdate(sql);
if (b > 0) {
System.out.println("删除学生成功");
} else {
System.out.println("删除学生失败");
}
JDBCUtils.close(conn, stmt);

}

public static void addStudent() throws SQLException {
System.out.println("请输入学生姓名");
String sname = sc.next();
System.out.println("请输入学生年龄");
int sage = sc.nextInt();
System.out.println("请输入学生性别");
String gender = sc.next();
System.out.println("请输入学生分数");
double score = sc.nextDouble();
System.out.println("请输入学生生日");
String brithday = sc.next();
Connection conn = JDBCUtils.getConnection();
String sql = "insert into student values(null," + sage + ",'" + sname + "','" + gender + "'," + score + ",'"
+ brithday + "')";
Statement stmt = conn.createStatement();
int b = stmt.executeUpdate(sql);
if (b > 0) {
System.out.println("添加学生成功");
} else {
System.out.println("添加学生失败");
}
JDBCUtils.close(conn, stmt);

}

}