CRUD之JDBC基本方法

• 基于JDBC的CRUD

package jdbc;

import java.sql.*;

/**
 * @author :KSea
 */
public class TestJDBC {
    public static void main(String[] args) {

        Connection connection = null;
        Statement statement = null;
        try {
            //1.初始化驱动
            Class.forName("com.mysql.jdbc.Driver");
            System.out.println("数据库加载成功");
            //2.与数据库连接
            connection = DriverManager.getConnection(
                    "jdbc:mysql://127.0.0.1:3306/ksea?characterEncoding=UTF-8",
                    "root",
                    "root");
            System.out.println("Connection Success! Connect object:" + connection);
            //3.创建执行sql语句的对象
            statement = connection.createStatement();
            System.out.println("" + statement);
            //4.编写sql语句,执行它

            //增
            String sql_add = "insert into hero values(null,"+"'test'"+","+45+")";
            //statement.execute(sql_add);

            //删
            String sql_del = "delete from hero where name = 'test'";
            //statement.execute(sql_del);

            //改
            String sql_upadate = "update hero set name = 'updata_name' where name = 'test'";
            //statement.execute(sql_upadate);

            //查,通过ResultSet来接收结果
            String sql_select = "select name from hero";
            Boolean execute = statement.execute(sql_select);
            if (execute) {
                ResultSet resultSet = statement.getResultSet();
                while (resultSet.next()) {
                    System.out.println(resultSet.getString("name"));
                }
            }
        } catch (ClassNotFoundException | SQLException e) {
            e.printStackTrace();
        }
        //5.关闭资源
        finally {
            try {
                connection.close();
                statement.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
    }