MySQL的安装+可视化工具+JDBC的增删改查

import com.mysql.jdbc.Connection;

import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class JDBC {
    public static void main(String[] args) {
        Statement statement = null;
        Connection connection = null;
        try {
            //固定写法
            Class.forName("com.mysql.jdbc.Driver");
            //连接Mysql（how2java是数据库名称，root是mysql的账号，admin是密码）
            connection = (Connection) DriverManager.getConnection("jdbc:mysql://127.0.0.1/how2java?characterEncoding=UTF-8", "root", "admin");
            System.out.println("数据库连接成功！" + connection);
            //创建Statement，用于执行SQL语句
            statement = connection.createStatement();
            System.out.println("获取Statement对象" + statement);
            //执行一条SQL语句
            //增删改都可以调用这个方法。只是SQL语句变一下
            String sql = "insert into hero values(null," + "'剑圣'" + "," + 415.0f + "," + 100 + ")";
            statement.execute(sql);
            System.out.println("插入成功！");
            //执行SQL查询功能
            String sql2 = "select * from hero";
            // 执行查询语句，并把结果集返回给ResultSet
            ResultSet rs = statement.executeQuery(sql);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            //最后，先关闭statement，再关闭连接
            if (statement != null) {
                try {
                    statement.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
            if (connection != null) {
                try {
                    connection.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}