• 简单的javamysql数据库系统


    package DatabaseTest;

    import java.io.FileInputStream;
    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.PreparedStatement;
    import java.sql.ResultSet;
    import java.sql.Statement;
    import java.util.Properties;
    import java.util.Scanner;

    public class FunctionToDatabase {

    private String driver;
    private String url;
    private String user;
    private String pass;

    public void initParam(String paramFile)throws Exception{

      Properties props = new Properties();
      props.load(new FileInputStream(paramFile));
      driver = props.getProperty("driver");
      url = props.getProperty("url");
      user = props.getProperty("user");
      pass = props.getProperty("pass");
    }

    public void work() throws Exception{
      Class.forName(driver);
    }

    public void set(String sql)throws Exception{
      this.work();
      try(
      Connection conn = DriverManager.getConnection(url,user,pass);
      Statement stmt = conn.createStatement())
      {
        stmt.execute(sql);
      }
    }

    public void switchFunction() throws Exception{

      Scanner sc = new Scanner(System.in);

      System.out.println("Please input your select 1-5:");
      System.out.println("************************************");
      System.out.println("1---add");
      System.out.println("2---delete");
      System.out.println("3---alter");
      System.out.println("4---search");
      System.out.println("5---exit system");
      System.out.println("************************************");
      System.out.println("Now! Please select your choice to manage the database!");

      switch(sc.nextInt()){
        case 1://add
        add();
        switchFunction();
        break;
        case 2://delete
        delete();
        switchFunction();
        break;
        case 3://Alter
        alter();
        switchFunction();
        break;
        case 4://Search
        search();
        switchFunction();
        break;
        case 5://exit
        System.exit(0);
        break;
        default:
        System.out.println("------- input error,try it again ! -------");
        switchFunction();
        break;
        }
    }

    //add data to database
    public void add(){
      Scanner sc = new Scanner(System.in);

      try{

         this.work();
        Connection conn = DriverManager.getConnection(url,user,pass);
        PreparedStatement pstmt = conn.prepareStatement("insert into " +
        "ConnectTest values(?,?,?,?);");

        // name age number money

        System.out.println("Please input your times you want to insert:");
        int cout = sc.nextInt();
        System.out.println("please input the data:");
        for (int j = 0; j < cout; j++){
          System.out.println("name" + (j+1) + ":");
          String Tname = sc.next();
          System.out.println("age" + (j+1) + ":");
          int Tage = sc.nextInt();
          System.out.println("number" + (j+1) + ":");
          int Tnum = sc.nextInt();
          System.out.println("money" + (j+1) + ":");
          double Tmoney = sc.nextDouble();
          pstmt.setString(1,Tname);
          pstmt.setInt(2,Tage);
          pstmt.setInt(3,Tnum);
          pstmt.setDouble(4,Tmoney);

          pstmt.executeUpdate();
        }
      }
      catch(Exception e){
        e.printStackTrace();
      }
      System.out.println("insert sucess!");

    }

    //delete data in database
    //delete from
    public void delete() throws Exception{
      Scanner sc = new Scanner(System.in);
      this.work();
      try(
        Connection conn = DriverManager.getConnection(url,user,pass);
        Statement stmt = conn.createStatement();
        PreparedStatement pstmt = conn.prepareStatement("delete from connecttest "
        + "where number = ?;");
        ){
          System.out.println("Please input the number you want to delete:");
          int num = sc.nextInt();
          pstmt.setInt(1, num);
          pstmt.executeUpdate();
          System.out.println("delete sucess!");
        }
    }

    //alter data in database
    //modify money
    public void alter() throws Exception{
      Scanner sc = new Scanner(System.in);
      this.work();
      try(
        Connection conn = DriverManager.getConnection(url,user,pass);
        PreparedStatement pstmt = conn.prepareStatement("update ConnectTest " +
        "set money = ?" +
        "where number = ?;");
        ){
          System.out.println("Please input the number you want to alter:");
          Thread.sleep(1000);
          int Tnum = sc.nextInt();
          System.out.println("Please input your money:");
          double Tmoney = sc.nextDouble();
          pstmt.setDouble(1, Tmoney);
          pstmt.setInt(2, Tnum);
          pstmt.executeUpdate();
          System.out.println("alter sucess!");
        }

    }

    //find the data by index
    public void search() throws Exception{
      Scanner sc = new Scanner(System.in);
      this.work();
      try(
        Connection conn = DriverManager.getConnection(url,user,pass);
        PreparedStatement pstmt = conn.prepareStatement("select from cnnnecttest" +
        "where number = ?;");
        ResultSet rs = pstmt.executeQuery();
        ){
          System.out.println("Please input the number you want to search:");
          int Tnum = sc.nextInt();
          pstmt.setInt(1,Tnum);

          System.out.println(rs.getString(1) + ' ' + rs.getString(2));

         }
        System.out.println("search sucess!");
    }

    public void drop(String sql) throws Exception{
      this.work();
      try(
        Connection conn = DriverManager.getConnection(url,user,pass);
        Statement stmt = conn.createStatement()
      )
      {
        stmt.executeUpdate(sql);
      }
    }

    public static void main(String[] args) throws Exception {

      FunctionToDatabase ftd = new FunctionToDatabase();
      ftd.initParam("mysql.ini");
      //ΪʲôһŜcreate databaseÿÿÿ
      //ftd.drop("drop database DatabaseTest");
      //ftd.set("create database DatabaseTest;");
      ftd.drop("drop table if exists ConnectTest;");
      ftd.set("create table ConnectTest (name varchar(255) not null,"
      + "age int not null, " + " number int(11) primary key,"
      + " money double not null);");

      System.out.println("Welcom!");
      ftd.switchFunction();

      //ftd.drop("drop table ConnectTest;");
      //ftd.drop("drop database DatabaseTest");
      }
    }

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  • 原文地址:https://www.cnblogs.com/100114jerro/p/5013438.html
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