简单增删改查java代码,javaweb实现简单的增删改查

求一段简单的JAVA代码 要求员工工资管理系统的一个增删改查代码，谢谢了

对数据库进行增删改查？

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以下是 sql server 2013+java.实现的是对MSC对象的增删改查.

需要下载连接驱动程序：com.microsoft.sqlserver.jdbc.SQLServerDriver

网上搜一下就行

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

class MSC

{

public String MscID;

public String MscName;

public String MscCompany;

public float MscLongitude;

public float MscLatitude;

public float MscAltitude;

public MSC(String MscID, String MscName, String MscCompany,

float MscLongitude, float MscLatitude,float MscAltitude){

this.MscID = MscID;

this.MscName = MscName;

this.MscCompany = MscCompany;

this.MscLongitude =MscLongitude;

this.MscLatitude = MscLatitude;

this.MscAltitude = MscAltitude;

}

}

public class sqlserverjdbc {

public Connection getConnection(){

String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver"; //加载JDBC驱动

String dbURL = "jdbc:sqlserver://localhost:1433; DatabaseName=gsm"; //连接服务器和数据库sample

String userName = "sa"; //默认用户名

String userPwd = "123"; //密码

Connection dbConn = null;

try {

Class.forName(driverName);

dbConn =DriverManager.getConnection(dbURL, userName, userPwd);

} catch (Exception e) {

e.printStackTrace();

}

return dbConn;

}

public void printUserInfo(){

Connection con = getConnection();

Statement sta = null;

ResultSet rs = null;

System.out.println("打印表格MSC信息");

try {

sta = con.createStatement();

rs = sta.executeQuery("select * from MSC信息");

System.out.println("MscID\tMscName\tMscCompany\tMscLongitude\tMscLatitude\tMscAltitude");

while(rs.next()){

System.out.println(rs.getString("MscID")+"\t"+

rs.getString("MscName")+"\t"+

rs.getString("MscCompany")+"\t"+

rs.getFloat("MscLongitude")+"\t"+

rs.getFloat("MscLatitude")+"\t"+

rs.getFloat("MscAltitude"));

}

con.close();

sta.close();

rs.close();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

System.out.println("打印完成\n");

}

public void delete(String MscID){

Connection con = getConnection();

String sql = "delete from MSC信息 where MscID = " + MscID;

PreparedStatement pst;

System.out.println("删除表格MSC信息中 ID = "+MscID+"的记录");

try {

pst = con.prepareStatement(sql);

pst.execute();

pst.close();

con.close();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

System.out.println("记录删除失败！！！");

}

System.out.println("记录删除成功！！！\n");

}

public void insert(MSC msc){

Connection con = getConnection();

String sql = "insert into MSC信息 values(?,?,?,?,?,?)";

PreparedStatement pst;

System.out.println("插入一条记录");

try {

pst = con.prepareStatement(sql);

pst.setString(1, msc.MscID);

pst.setString(2, msc.MscName);

pst.setString(3, msc.MscCompany);

pst.setFloat(4, msc.MscLongitude);

pst.setFloat(5, msc.MscLatitude);

pst.setFloat(6, msc.MscAltitude);

pst.execute();

pst.close();

con.close();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

System.out.println("插入失败！！！");

}

System.out.println("插入成功！！！\n");

}

//更新MscID的MscName

public void updateMscName(String MscID, String MscName){

Connection con = getConnection();

String sql = "update MSC信息 set MscName = ? where MscID = ?";

PreparedStatement pst;

System.out.println("修改一条记录");

try {

pst = con.prepareStatement(sql);

pst.setString(1, MscName);

pst.setString(2, MscID);

pst.execute();

pst.close();

con.close();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

System.out.println("修改失败！！！");

}

System.out.println("修改成功！！！\n");

}

public static void main(String args[]){

sqlserverjdbc sql = new sqlserverjdbc();

sql.printUserInfo();

sql.delete("1111");

sql.printUserInfo();

sql.updateMscName("5215", "联想");

sql.printUserInfo();

sql.insert(new MSC("1111", "中兴" ," 中兴", (float)12.2, (float)3.4,(float)45.5));

sql.printUserInfo();

}

}

求java的增删改查代码

ResultSet rs=s.executeQuery("select * from teacher"); //查询语句

s.executeUpdate("update into teacher set ....."); //插入，更新 ，删除语句

/**

*插入，更新 ，删除

*主要就是SQL语句不同

*/

java连接sql数据库。实现增删改查怎么写。谁有实例

原文链接随便找的还行网页链接

右键点击项目名依次点击new–Directory 创建文件夹lib

2.把mysql-connector-java-5.1.48-bin.jar包粘贴到lib目录中

3.把数据库连接jar包导入到项目中

JDBC步骤：

加载数据库的驱动，它是java和数据库之间的桥梁

2.获取Connection，java和数据库的一次连接

3.创建Statement对象，由Connection产生，执行sql语句

4.如果要接收返回值，创建ResultSet对象，保存Statement执行后所查到的结果

增删改代码：

package cn.web.jdbc;

import java.sql.*;

public class executeUpdate {

public static void main(String[] args) {

//  加载驱动

try {

Class.forName("com.mysql.jdbc.Driver");

// 获取连接

String url = "jdbc:mysql://localhost:3306/usejdbc?useUnicode=truecharacterEncoding=UTF-8useSSL=false";

String user = "root";

String password = "123456";

try {

//  连接对象输入三个参数

Connection connection = DriverManager.getConnection(url, user, password);

System.out.println(connection);

//定义sql语句

// 增

String sql1 = "insert into student(username,password) values ('诸葛亮','111111')";

// 删

String sql2 = "delete from student where username ='诸葛亮'";

// 改

String sql3 = "update student set  username='老八' where id = 1 ";

Statement statement = connection.createStatement();

//                修改这里的sql即可

int count = statement.executeUpdate(sql1);

System.out.println(count);

//   ----------------------------------------------------------------

//                释放资源

statement.close();

connection.close();

resultSet.close();

} catch (SQLException e) {

e.printStackTrace();

}

} catch (ClassNotFoundException e) {

e.printStackTrace();

}

}

}

对数据库实现增删改查的Java程序

增删改查都有链接网页链接

粘贴着查询的：

package cn.web.jdbc;

import java.sql.*;

public class UserLogin {

public static void main(String[] args) {

  //  加载驱动

  try {

      Class.forName("com.mysql.jdbc.Driver");

      // 获取连接

      String url = "jdbc:mysql://localhost:3306/usejdbc?useUnicode=truecharacterEncoding=UTF-8useSSL=false";

      String user = "root";

      String mysqlPassword = "123456";

      //模拟前台传入的用户名和密码

      String InputUsername = "老八";

      String InputPassword = "123456";

      try {

          //  连接对象输入三个参数

          Connection connection = DriverManager.getConnection(url, user, mysqlPassword);

          System.out.println(connection);

          //定义sql语句

//                查询

          String sql1 = "select * from student where username='" + InputUsername + "' and password='" + InputPassword + "'";

          System.out.println(sql1);

          Statement statement = connection.createStatement();

          ResultSet resultSet = statement.executeQuery(sql1);

          System.out.println(resultSet);

          if (resultSet.next()) {

              System.out.println("登录成功");

          } else {

              System.out.println("登录失败");

          }

//                释放资源

          statement.close();

          connection.close();

resultSet.close();

      } catch (SQLException e) {

          e.printStackTrace();

      }

  } catch (ClassNotFoundException e) {

      e.printStackTrace();

  }

}

}