root用户连接mysql数据库

import mysql.connector

# 创建连接
cnx = mysql.connector.connect(user='root', password='your_password', host='localhost', database='your_database')

# 创建游标
cursor = cnx.cursor()

# 执行SQL查询
query = "SELECT * FROM your_table"
cursor.execute(query)

# 获取查询结果
results = cursor.fetchall()

# 输出查询结果
for row in results:
    print(row)

# 关闭游标和连接
cursor.close()
cnx.close()

import java.sql.*;

public class MySQLExample {
    public static void main(String[] args) {
        Connection connection = null;
        Statement statement = null;
        ResultSet resultSet = null;

        try {
            // 加载驱动程序
            Class.forName("com.mysql.jdbc.Driver");

            // 建立连接
            connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/your_database", "root", "your_password");

            // 创建Statement对象
            statement = connection.createStatement();

            // 执行SQL查询
            String query = "SELECT * FROM your_table";
            resultSet = statement.executeQuery(query);

            // 处理查询结果
            while (resultSet.next()) {
                // 处理每一行数据
                String column1 = resultSet.getString(1);
                String column2 = resultSet.getString(2);
                System.out.println(column1 + " - " + column2);
            }
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            // 关闭连接和资源
            try {
                if (resultSet != null) resultSet.close();
                if (statement != null) statement.close();
                if (connection != null) connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}