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public class Test1 {
public static void main(String[] args) throws ClassNotFoundException, SQLException {
// 00 下载mysql的数据库驱动包，把包导入到当前的项目
//
jar包右键--> build path---> add to build path
// 1，加载驱动
// mysql驱动包 5版：
com.mysql.jdbc.Driver
// mysql驱动包 8版：
com.mysql.cj.jdbc.Driver
Class.forName("com.mysql.jdbc.Driver");
// 2，连接连接
//
http://ip:端口号/资源路径
//
mysq驱动 5版
jdbc:mysql://localhost:3306/数据库名
//
mysql 8版
驱动 5版
jdbc:mysql://localhost:3306/ss?characterEncoding=gbk
//
mysq驱动 8版
jdbc:mysql://localhost:3306/数据库名?serverTimezone=UTC
String url = "jdbc:mysql://localhost:3306/employee";
Connection connection = DriverManager.getConnection(url, "root", "root");
//System.out.println(connection);
// 3，创建sql对象
//String sql = "insert into student values(7,'田七','男','1998-2-3',23)";
//String sql = "update student set name='田七七' where id=7 ";
Statement sta = connection.createStatement();
// 4，执行sql语句
String sql = "delete from student where id=7";
int num = sta.executeUpdate(sql);
// executeUpdate() 增加 删除 修改
// 5，处理结果集
if(num==0) {
System.out.println("操作失败");
}else {
System.out.println("操作成功");
}
// 6，释放资源
sta.close();
connection.close();
}
}

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	package JDBCUtil;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class jdbcUtil {
private static String driver = "com.mysql.jdbc.Driver";
private static String url = "jdbc:mysql:///duobiao";
private static String root = "root";
private static String password = "980214";
private static Connection connection = null;
private static PreparedStatement prepareStatement = null;
private static ResultSet executeQuery=null;
/*
* 加载驱动
*/
static {
try {
Class.forName(driver);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
/*
* 建立连接
*/
public static void myconnection() {
try {
connection = DriverManager.getConnection(url,root,password);
} catch (SQLException e) {
e.printStackTrace();
}
}
/*
*增删改
*/
public static int update(String sql,Object[] object) {
myconnection();
int executeUpdate=0;
try {
prepareStatement = connection.prepareStatement(sql);
if (object!=null) {
for (int i = 0; i < object.length; i++) {
prepareStatement.setObject(i+1, object[i]);
}
}
executeUpdate = prepareStatement.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
}finally {
close();
}
return executeUpdate;
}
/*
* 查询
*/
public static ResultSet select(String sql,Object[] object) {
myconnection();
try {
prepareStatement = connection.prepareStatement(sql);
if (object!=null) {
for (int i = 0; i < object.length; i++) {
prepareStatement.setObject(i+1, object[i]);
}
}
executeQuery = prepareStatement.executeQuery();
}catch (Exception e) {
}
return executeQuery;
}
//	释放资源
public static void close() {
try {
if (prepareStatement!=null) {
prepareStatement.close();
}
if (connection!=null) {
connection.close();
}
if (executeQuery!=null) {
executeQuery.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}
}