文章目录

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前题

例1为无使用GUI图形界面，例2使用GUI图形界面！

首先自己的JDBC驱动已经接好了，连接自己的数据库没有问题。连接数据库可以看其他博主教程，不是很难。

其次我用的是idea+SQL Server数据库。

最后我的数据的库名称为stu，表名称为student，可以自己创建一张，内容如下：

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一、运行效果

 

  

所需四个类如下：

 

 

 

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二、Text实现类

Text为实现所有类，含有main方法，源代码如下：

package 自我课设;public class Text {public static void main(String[] args) {Manage manage = new Manage();manage.manager();}
}

  

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三、Manage选择类

用于选择6种方法，运用case来选择，源代码如下：

package 自我课设;import java.util.*;
public class Manage {public void manager(){StudentWay studentWay = new StudentWay();Scanner in = new Scanner(System.in);int flag = 0;while(true) {studentWay.printManage();System.out.println(" 请输入要执行的操作:");flag = in.nextInt();in.nextLine();if(flag == 6) break;else {switch (flag) {case 1://查询全部studentWay.selectStudent();break;case 2://添加信息studentWay.addStudent();break;case 3://删除学生信息studentWay.deleteStudent();break;case 4://修改学生信息studentWay.updateStudent();break;case 5://查询相关信息studentWay.selectOther();break;}}}}
}

 

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四、StudentWay学生方法类

写好增删查改的方法给到Manage去调用，源代码如下：

package 自我课设;import java.util.Scanner;public class StudentWay {StudentSql sql = new StudentSql();Scanner in = new Scanner(System.in);String sno = "", sname = " ", sex = " ", sage = " ", dept = " ";//输出界面图public void printManage() {System.out.println("---------------------学生信息管理系统-----------------------");System.out.println("                     1.查询全体学生信息                     ");System.out.println("                     2.添加学生信息                        ");System.out.println("                     3.删除学生信息                        ");System.out.println("                     4.修改学生信息                        ");System.out.println("                     5.查询学生相关信息                     ");System.out.println("                     6.退出                              ");System.out.println("--------------------------------------------------------");}//查询学生信息public void selectStudent() {System.out.println("查询全体学生信息：");System.out.print(sql.QuerySQL());}//删除学生信息public void deleteStudent() {System.out.println("请输入要删除的学生的学号：");sno = in.nextLine();System.out.print(sql.delete_student(sno));}//添加学生信息public void addStudent() {System.out.println("请输入要添加的学生的信息（以单个空格隔开）：");String str = in.nextLine();String[] S = str.split(" ");sno = S[0];sname = S[1];sex = S[2];sage = S[3];dept = S[4];System.out.print(StudentSql.insert_student(sno, sname, sex, sage, dept));}//修改学生信息public void updateStudent() {System.out.println("请输入要修改的学生的学号：");sno = in.nextLine();System.out.println("请输入学生姓名、性别、年龄、学院,以单个空格隔开(学号不可修改)：");String str2 = in.nextLine();String[] S2 = str2.split(" ");sname = S2[0];sex = S2[1];sage = S2[2];dept = S2[3];StudentSql.update_student(sno, sname, sex, sage, dept);System.out.println("修改成功！");}//查询分类的学生信息public void selectOther() {System.out.println(" 1.按学院查询   ");System.out.println(" 2.按学号查询  ");System.out.println(" 3.按性别查询  ");int FLG = Integer.parseInt(in.nextLine());//in.nextInt();switch (FLG) {case 1://按学院查询System.out.println("要查询的学院：");String temp_xueyuan = in.nextLine();System.out.print(sql.QuerySQL_dept(temp_xueyuan));break;case 2://按学号查询System.out.println("要查询学生的学号：");String temp_sno = in.nextLine();System.out.print(sql.QuerySQL_sno(temp_sno));break;case 3://按性别查询System.out.println("要查询的性别：");String temp_sex = in.nextLine();System.out.print(sql.QuerySQL_sex(temp_sex));break;}}
}

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五、StudnetSql数据库类

StudentSql类写数据库的语句对数据库直接进行操作，然后给StudnetWay调用，源代码如下：

package 自我课设;import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;public class StudentSql
{//连接数据库private static Connection getSQLConnection(String db,String user, String pwd){Connection con = null;try{//Class.forName("net.sourceforge.jtds.jdbc.Driver");  查看驱动器JDBC是否导入成功//con = DriverManager.getConnection("jdbc:jtds:sqlserver://" + ip + ":1433/" + db + ";charset=utf8", user, pwd);//jdbc:jtds:sqlserver://localhost:1433/dbname//解决输出中文乱码con = DriverManager.getConnection("jdbc:sqlserver://localhost:1433;encrypt=false;DatabaseName="+ db , user, pwd);}catch (SQLException e) {e.printStackTrace();}return con;}//查询学生信息public static String QuerySQL(){String result = "";try{Connection conn = getSQLConnection("stu","sa","123456");String sql = "select  *from student";Statement stmt = conn.createStatement();ResultSet rs = stmt.executeQuery(sql);System.out.println("学号   姓名   性别   年龄   学院");//System.out.println(rs);while (rs.next()){//学号、姓名、性别、年龄、学院String s1 = rs.getString("sno");String s2 = rs.getString("sname");String s3 = rs.getString("ssex");String s4 = rs.getString("sage");String s5 = rs.getString("dept");result += s1 + "  " + s2 + "  " + s3 + "  " + s4+ "  " + s5+" "+"\n";}rs.close();stmt.close();conn.close();} catch (SQLException e){e.printStackTrace();result += "数据输入异常!" + e.getMessage()+"\n";}return result;}//添加学生信息public static String insert_student(String sno, String name, String sex, String sage,String dept){//学号、姓名、性别、年龄、学院String result = "";try{Connection conn = getSQLConnection("stu","sa","123456");String sql = "insert into  student values ('"+sno+"','"+name+"','"+sex+"','"+sage+"','"+dept+"');";Statement stmt = conn.createStatement();stmt.executeUpdate(sql);stmt.close();conn.close();result+="添加成功！"+"\n";} catch (SQLException e){e.printStackTrace();result += "数据输入异常!" + e.getMessage()+"\n";}return result;}//删除学生信息public static String delete_student(String sno){//学号、姓名、性别、年龄、学院String result = "";try{Connection conn =  getSQLConnection("stu","sa","123456");String sql = "delete student where sno = " + sno;Statement stmt = conn.createStatement();stmt.executeUpdate(sql);stmt.close();conn.close();result+="删除成功!\n";} catch (SQLException e){e.printStackTrace();result += "数据输入异常!" + e.getMessage()+"\n";}return result;}//按学号修改public static String update_student(String sno, String name, String sex, String sage,String dept){//学号、姓名、性别、年龄、学院String result = "";try{Connection conn = getSQLConnection("stu","sa","123456");String sql = "update student set sname='"+name+"',ssex='"+sex+"',sage='"+sage+"',dept='"+dept+"'" +" where sno='"+sno+"' ";Statement stmt = conn.createStatement();stmt.executeUpdate(sql);stmt.close();conn.close();result+="修改成功！"+"\n";} catch (SQLException e){e.printStackTrace();result += "数据输入异常!" + e.getMessage()+"\n";}return result;}//按学号查询public static String QuerySQL_sno(String sno){String result = "";try{Connection conn =  getSQLConnection("stu","sa","123456");String sql = "select *from student where sno = '"+ sno+"';";Statement stmt = conn.createStatement();ResultSet rs = stmt.executeQuery(sql);while (rs.next()){//学号、姓名、性别、年龄、学院String s1 = rs.getString("sno");String s2 = rs.getString("sname");String s3 = rs.getString("ssex");String s4 = rs.getString("sage");String s5 = rs.getString("dept");result += s1 + "  " + s2 + "  " + s3 + "  " + s4+ "  " + s5+" "+"\n";}rs.close();stmt.close();conn.close();} catch (SQLException e){e.printStackTrace();result += "数据输入异常!" + e.getMessage()+"\n";}return result;}//按性别查询public static String QuerySQL_sex(String sex){String result = "";try{Connection conn =  getSQLConnection("stu","sa","123456");String sql = "select * from student where ssex = '"+sex+"';";Statement stmt = conn.createStatement();ResultSet rs = stmt.executeQuery(sql);while (rs.next()){//学号、姓名、性别、年龄、学院String s1 = rs.getString("sno");String s2 = rs.getString("sname");String s3 = rs.getString("ssex");String s4 = rs.getString("sage");String s5 = rs.getString("dept");result += s1 + "  " + s2 + "  " + s3 + "  " + s4+ "  " + s5+" "+"\n";}rs.close();stmt.close();conn.close();} catch (SQLException e){e.printStackTrace();result += "数据输入异常!" + e.getMessage()+"\n";}return result;}//按学院查询public static String QuerySQL_dept(String dept){String result = "";try{Connection conn =  getSQLConnection("stu","sa","123456");String sql = "select * from student where dept = '"+ dept +"';";Statement stmt = conn.createStatement();ResultSet rs = stmt.executeQuery(sql);//System.out.println(rs);while (rs.next()){//学号、姓名、性别、年龄、学院String s1 = rs.getString("sno");String s2 = rs.getString("sname");String s3 = rs.getString("ssex");String s4 = rs.getString("sage");String s5 = rs.getString("dept");result += s1 + "  " + s2 + "  " + s3 + "  " + s4+ "  " + s5+" "+"\n";// System.out.println(s1 + "  -  " + s2);}rs.close();stmt.close();conn.close();} catch (SQLException e){e.printStackTrace();result += "数据输入异常!" + e.getMessage()+"\n";}return result;}}

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