1.使用JDBC的步骤：

public static void main(String[] args) {
		//初始化驱动
		String url="jdbc:mysql://localhost:3306/how2j";
		String name ="root";
		String psw="admin";
		String driverName="com.mysql.cj.jdbc.Driver";//最新版本的驱动
        try {
        	//1.加载数据驱动
        	Class.forName(driverName);
            //2.建立数据库连接
            Connection c = DriverManager.getConnection(url, name, psw);
           
            //3.执行sql语句（insert,update,delete,select)
            Statement s = c.createStatement(); 
            String sql = "insert into hero values(null,"+"'ォスセ'"+","+224.0f+","+60+")";
            
            //4.执行insert,update,delete
            s.executeUpdate(sql);
           
            //关闭对象（必须是这个顺序）
            s.close();
            c.close();
  
        
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

	}

**

2.关闭方式：

（1）直接关闭，但是必须先关闭Statement对象，再关闭Connnection对象.如上代码中那样。
( 2 ) 可以放在finally中关闭，但是必须先关闭Statement对象，再关闭Connnection对象。

finally {
            // 数据库的连接时有限资源，相关操作结束后，养成关闭数据库的好习惯
            // 先关闭Statement
            if (s != null)
                try {
                    s.close();
                } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            // 后关闭Connection
            if (c != null)
                try {
                    c.close();
                } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
 
        }

。**
（3）用更简单而规范一点的方式，是用try-with-resource的方式自动关闭连接，因为Connection和Statement都实现了AutoCloseable接口

String url="jdbc:mysql://localhost:3306/how2j?user=root&password=admin";
		String driverName="com.mysql.cj.jdbc.Driver";
		
		try {
	          Class.forName(driverName);
	        } catch (ClassNotFoundException e) {
	            e.printStackTrace();
	        }
	  
	        try (
	            Connection c = DriverManager.getConnection(url);
	            Statement s = c.createStatement();             
	        )
	         {
	            String sql = "insert into hero values(null," + "'九尾狐'" + "," + 500.0f + "," + 120 + ")";
	            s.execute(sql);
	              
	        } catch (SQLException e) {
	            // TODO Auto-generated catch block
	            e.printStackTrace();
	        }