通过idea使用jdbc对数据进行增删改查的操作

通过idea使用jdbc对数据进行增删改查的操作

DAO包

package util;

import java.sql.*;

public class BaseDao {
//连接数据库
public Connection getConnection() {
try {
Class.forName(“com.mysql.jdbc.Driver”);
String url = “jdbc:mysql://localhost:3306/test”;
String user = “root”;
String password = “19970719zhyy”;
Connection conn = DriverManager.getConnection(url, user, password);
return conn;
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}
//关闭连接
public void closeAll(ResultSet rs,Statement statement,Connection conn) {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (statement != null) {
try {
statement.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
//增删改方法
public int update(String sql) {
Connection conn = null;
Statement statement = null;
try {
conn = getConnection();
statement = conn.createStatement();
int res =statement.executeUpdate(sql);
return res;
} catch (SQLException e) {
e.printStackTrace();
}finally {
closeAll(null, statement, conn);
}
return 0;
}
//查询
public ResultSet query(String sql) {
Connection conn = null;
Statement statement = null;
ResultSet rs = null;
try {
conn = getConnection();
statement = conn.createStatement();
rs = statement.executeQuery(sql);
return rs;
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}
}

person类
package test;

/**

• @author ：张洋洋

• @date ：Created in 2019/8/26

• @description：

• @version: $
  */
  public class person {
  private int id;
  private String zh;
  private String mm;
  private String xm;
  private int sfz;

  public int getId() {
  return id;
  }

  public void setId(int id) {
  this.id = id;
  }

  public String getZh() {
  return zh;
  }

  public void setZh(String zh) {
  this.zh = zh;
  }

  public String getMm() {
  return mm;
  }

  public void setMm(String mm) {
  this.mm = mm;
  }

  public String getXm() {
  return xm;
  }

  public void setXm(String xm) {
  this.xm = xm;
  }

  public int getSfz() {
  return sfz;
  }

  public void setSfz(int sfz) {
  this.sfz = sfz;
  }

  @Override
  public String toString() {
  return “person{” +
  “id=” + id +
  “, zh=’” + zh + ‘’’ +
  “, mm=’” + mm + ‘’’ +
  “, xm=’” + xm + ‘’’ +
  “, sfz=” + sfz +
  ‘}’;
  }
  }

测试

package test;

import jdk.swing.interop.SwingInterOpUtils;
import util.BaseDao;

import java.nio.channels.SelectableChannel;
import java.sql.*;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Scanner;

/**

• @author ：张洋洋

• @date ：Created in 2019/8/26

• @description：

• @version: $
  */
  public class test {
  public static void main(String[] args) {
  BaseDao bd = new BaseDao();
  Date d =new Date();
  SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-MM-dd HH:mm:ss”);
  // List List = new ArrayList();
  Statement sta= null;
  System.out.println(“欢迎来到王者荣耀”);
  System.out.println(“请选择注册或者登陆”);
  System.out.println(“1是注册，2是登陆”);
  Scanner sca = new Scanner(System.in);
  int i = sca.nextInt();

       if(i==1){
           System.out.println("请输入id");
           Scanner sc=new Scanner(System.in);
           String id=sc.nextLine();
           System.out.println("请输入账号");
           String zh=sc.nextLine();
           System.out.println("请输入密码");
           String mm=sc.nextLine();
           System.out.println("请输入姓名");
           String xm= sc.nextLine();
           System.out.println("请输入身份证号");
           String sfz = sc.nextLine();
           String sql  ="insert into test values("+id+","+zh+","+mm+","+xm+","+sfz+")";
           int rs1 = bd.update(sql);
           System.out.println(rs1);
           System.out.println("注册成功");
       }else if (i==2){
           Scanner sc=new Scanner(System.in);
           System.out.println("请输入账号");
           String zh=sc.nextLine();
           System.out.println("请输入密码");
           String mm=sc.nextLine();
  
           String sql="select * from test where zh='"+zh+"' and mm='"+mm+"'";
           ResultSet rs = bd.query(sql);
           try {
               if(rs.next()){
                   System.out.println("登陆成功！欢迎你"+zh);
                   Scanner sc2 = new Scanner(System.in);
                   while (true) {
                       System.out.println("====输入1查看个人信息====");
                       System.out.println("====输入2修改个人信息====");
                       System.out.println("====输入3删除个人信息====");
                       System.out.println("====输入4进行退出程序====");
                       int b = sc.nextInt();
                       if (b == 4) {
                           break;
                       }
                       switch (b) {
                           case 1:
                               Scanner sc3 = new Scanner(System.in);
                               System.out.println("请输入你需要查询的账号");
                               String sfz1 = sc3.next();
                               String sql2 = "select * from test where zh= '"+sfz1+"'";
                               ResultSet rs2 = bd.query(sql2);
                               if (rs2.next()) {
                                   System.out.println("账号"+rs2.getString("zh"));
                                   System.out.println("密码"+rs2.getString("mm"));
                                   System.out.println("姓名"+rs2.getString("xm"));
                                   System.out.println("身份证号"+rs2.getString("sfz"));
                               } else {
                                   System.out.println("查无此人");
                               }
                           break;
                           case 2: System.out.println("修改个人信息");
                               System.out.println("1修改姓名2修改身份证号3修改密码");
                           Scanner xg = new Scanner(System.in);
                           int sg = xg.nextInt();
                           if(sg==1){
                               System.out.println("请输入修改后的名字");
                               Scanner xgxm = new  Scanner(System.in);
                               String xgxm1 = xgxm.next();
                               String sql3="update test set xm='"+xgxm1+"' where zh='"+zh+"'";
                               int res = bd.update(sql3);
                               if (res > 0) {
                                   System.out.println("修改成功");
                               } else {
                                   System.out.println("修改失败");
                               }
  
                           }else if(sg==2){
                               System.out.println("请输入修改后的身份证号");
                               Scanner xgsfz = new  Scanner(System.in);
                               String xgxm2 = xgsfz.next();
                               String sql4="update test set sfz='"+xgxm2+"' where zh='"+zh+"'";
                               int res = bd.update(sql4);
                               if (res > 0) {
                                   System.out.println("修改成功");
                               } else {
                                   System.out.println("修改失败");
                               }
                           }
                           break;
                           case 3: System.out.println("欢迎来到修改密码");break;
                       }
                   }
                   System.out.println( "现在时间"+sdf.format(d));
               }
               else{
                   System.out.println("输入账号或密码错误");
               }
           } catch (SQLException e) {
               e.printStackTrace();
           }
       }
  
  
   }
  

}

效果演示