.NET 与 MYSQL AES_DECRYPT 解密结果 为NULL

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		SELECT F_CustomerId ,CAST(AES_DECRYPT(unhex(F_MobileEncryption),   '**********') AS CHAR(50)) AS F_MobileDecrypt
                                                                         ,CAST(AES_DECRYPT(unhex(F_Mobile2Encryption),  '**********') AS CHAR) AS F_Mobile2Decrypt
                                                                         ,CAST(AES_DECRYPT(unhex(F_Mobile3Encryption),   '**********')AS CHAR) AS F_Mobile3Decrypt  FROM lfine_crm_customer

相同的语句 ，在数据库可以看到解密结果 ，但是在代码当中看不到解密结果 。

求大神赐教