mysql数据库处理失败

# 检查 MySQL 服务状态
sudo systemctl status mysql

# 启动 MySQL 服务
sudo systemctl start mysql

# 检查防火墙设置
sudo ufw allow 3306/tcp

-- 检查表是否存在
SHOW TABLES LIKE 'your_table_name';

-- 使用 EXPLAIN 分析查询计划
EXPLAIN SELECT * FROM your_table_name WHERE condition;

-- 检查数据类型
DESCRIBE your_table_name;

-- 处理唯一键冲突
INSERT INTO your_table_name (column1, column2) VALUES (value1, value2)
ON DUPLICATE KEY UPDATE column1 = value1;

-- 创建索引
CREATE INDEX idx_column_name ON your_table_name(column_name);

-- 优化查询
SELECT * FROM your_table_name WHERE indexed_column = 'value';

import mysql.connector

try:
    conn = mysql.connector.connect(
        host="localhost",
        user="your_username",
        password="your_password",
        database="your_database"
    )
    cursor = conn.cursor()
    cursor.execute("SELECT * FROM your_table_name")
    results = cursor.fetchall()
    for row in results:
        print(row)
except mysql.connector.Error as err:
    print(f"Error: {err}")
finally:
    if conn.is_connected():
        cursor.close()
        conn.close()