您的位置:首页 > 编程语言 > Java开发

java Mysql简单增删改查

2016-04-11 09:16 567 查看
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) + '\t' + 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");

  }

}
内容来自用户分享和网络整理,不保证内容的准确性,如有侵权内容,可联系管理员处理 点击这里给我发消息
标签: