SET block_encryption_mode = 'aes-256-ecb';

SELECT
    u.`id`            AS `id`,
    u.`username`      AS `username`,
    u.`unionid`       AS `unionid`,
    u.`openid`        AS `openid`, 

    CONVERT(AES_DECRYPT(FROM_BASE64(u.`country_code`), '32位秘钥') USING utf8mb4) AS `country_code`,
    CONVERT(AES_DECRYPT(u.`tel`,      '32位秘钥') USING utf8mb4) AS `tel`,
    CONVERT(AES_DECRYPT(u.`district`, '32位秘钥') USING utf8mb4) AS `district`,
    CONVERT(AES_DECRYPT(u.`address`,  '32位秘钥') USING utf8mb4) AS `address`

FROM `user` u;