1）导入依赖

<dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.7.27</version>
</dependency>

2）定义Connection连接类

public class Conn {//定义Driverpublic static final String driver = "com.mysql.jdbc.Driver";//定义getConnection方法获取Connectionpublic static Connection getConnection(String url, String username, String password) {Connection conn = null;try {//注册驱动Class.forName(driver);//获取Connectionconn = DriverManager.getConnection(url, username, password);} catch (ClassNotFoundException e) {e.printStackTrace();} catch (SQLException e) {e.printStackTrace();}return conn;}//关闭连接public static void close(Connection conn, PreparedStatement ps, ResultSet rs) {if (conn != null) {try {conn.close();} catch (SQLException e) {e.printStackTrace();}}if (ps != null) {try {ps.close();} catch (SQLException e) {e.printStackTrace();}}if (rs != null) {try {rs.close();} catch (SQLException e) {e.printStackTrace();}}}//关闭连接public static void close(Connection conn, PreparedStatement ps) {if (conn != null) {try {conn.close();} catch (SQLException e) {e.printStackTrace();}}if (ps != null) {try {ps.close();} catch (SQLException e) {e.printStackTrace();}}}
}

3）使用JDBC进行Mysql数据库操作

3.1.写入

public class Test {private static final String tmpUrl = "jdbc:mysql://192.168.1.1:3306/test?characterEncoding=utf-8";private static final String tmpUsername = "root";private static final String tmpPassword = "123456";private static Connection conn;private static PreparedStatement ps;private static ResultSet rs;public static void main(String[] args) {conn = Conn.getConnection(tmpUrl, tmpUsername, tmpPassword);try {//编辑sql，返回PreparedStatement状态ps = conn.prepareStatement("insert into `table` values(1234, '张三')");//执行写入数据的操作rs = ps.executeUpdate();} catch (SQLException e) {e.printStackTrace();} finally {//释放资源Conn.close(conn, ps, rs);}}
}

3.2.删除

public class Test {private static final String tmpUrl = "jdbc:mysql://192.168.1.1:3306/test?characterEncoding=utf-8";private static final String tmpUsername = "root";private static final String tmpPassword = "123456";private static Connection conn;private static PreparedStatement ps;private static ResultSet rs;public static void main(String[] args) {conn = Conn.getConnection(tmpUrl, tmpUsername, tmpPassword);try {//编辑sql，返回PreparedStatement状态ps = conn.prepareStatement("delete from `table` where id = ?");//定义参数（?按照顺序进行参数配置，如下是删除id为1234的数据）ps.setInt(1,1234)//执行删除数据的操作rs = ps.executeUpdate();} catch (SQLException e) {e.printStackTrace();} finally {//释放资源Conn.close(conn, ps, rs);}}
}

3.3.修改

public class Test {private static final String tmpUrl = "jdbc:mysql://192.168.1.1:3306/test?characterEncoding=utf-8";private static final String tmpUsername = "root";private static final String tmpPassword = "123456";private static Connection conn;private static PreparedStatement ps;private static ResultSet rs;public static void main(String[] args) {conn = Conn.getConnection(tmpUrl, tmpUsername, tmpPassword);try {//编辑sql，返回PreparedStatement状态ps = conn.prepareStatement("update `table` set name = '张三' where id = ?");//定义参数（?按照顺序进行参数配置，如下是修改id为1234的数据）ps.setInt(1,1234)//执行修改数据的操作rs = ps.executeUpdate();} catch (SQLException e) {e.printStackTrace();} finally {//释放资源Conn.close(conn, ps, rs);}}
}

3.4.查询

public class Test {private static final String tmpUrl = "jdbc:mysql://192.168.1.1:3306/test?characterEncoding=utf-8";private static final String tmpUsername = "root";private static final String tmpPassword = "123456";private static Connection conn;private static PreparedStatement ps;private static ResultSet rs;public static void main(String[] args) {conn = Conn.getConnection(tmpUrl, tmpUsername, tmpPassword);try {//编辑sql，返回PreparedStatement状态ps = conn.prepareStatement("SELECT `id`, `name` FROM `table`");//返回ResultSet结果集rs = ps.executeQuery();//遍历结果集while (rs.next()) {//获取每条数据的id，name（两种写法都可以）//int id = rs.getInt("id");int id = rs.getInt(1);//String name = rs.getString("name");String name = rs.getString(2);}} catch (SQLException e) {e.printStackTrace();} finally {//释放资源Conn.close(conn, ps, rs);}}
}