java基于jdbc实现简单学生管理系统
目录
- 工具类
- 工程目录:
- 运行截图:
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. #<!-- \u914D\u7F6E\u521D\u59CB\u5316\u5927\u5C0F --> initialSize=6 #<!-- \u914D\u7F6E\u521D\u59CB\u5316\u6700\u5927\u8FDE\u63A5\u6570 --> maxActive=20 #<!-- \u914D\u7F6E\u521D\u59CB\u5316\u6700\u5C0F\u8FDE\u63A5\u6570 --> minIdle=3 #<!-- \u914D\u7F6E\u83B7\u53D6\u8FDE\u63A5\u7B49\u5F85\u8D85\u65F6\u7684\u65F6\u95F4,1\u5206\u949F\u5355\u4F4D\u6BEB\u79D2 --> 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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