在两个不同的数据库上联接表以使用SQLAchemy进行查询吗？

如何解决在两个不同的数据库上联接表以使用SQLAchemy进行查询吗？

我正在使用Flask，SQLALchemy，Flask-SQLAlchemy，棉花糖和数据表为管理员创建游戏服务器的用户列表，它将条目按唯一标识符（流ID）分组，然后列出该流的每个字符使用datatables连续获取ID，所有这些信息都直接从运行游戏的mariadb数据库中提取，此外，我还有一个单独的数据库，可用于通过绑定使用该网站的网站，并且一切正常。现在，对于该用户列表，我正在使用棉花糖对数据进行序列化并从Web数据库添加配置文件信息。但是，我希望能够对配置文件字段（名称）之一进行服务器端搜索，因此我需要加入Users表和Accounts表，除非它们位于如上所述的独立数据库中。

现在查询是字符表和帐户表，它们都在同一数据库上 characters = Character.query.join(Account).order_by(Account.ID.desc())

如果我尝试加入与游戏数据库分开的Web数据库上的User表，它将尝试在不存在的游戏服务器数据库上查找User表。 characters = Character.query.join(Account).join(User,User.steam_id == Account.SteamID).order_by(Account.ID.desc())

一年前，我在搜索中看到了一些对话，然后放弃了，只是使用棉花糖来包含信息（但无法搜索），并且有人谈论在表中添加 schema 我尝试过，但最终没有成功。

我正在使用flask-sqlalchemy来处理为sqlalchemy创建引擎和会话对象。

flask-sqlalchemy: Trouble joining tables from two databases (different bind keys). Getting error 1146 (see below) 因此，我回过头来，找到了关于我的问题以及他们如何克服它的旧帖子，并尝试了所有尝试，但它仍在同一服务器上而不是通过不同的连接绑定来查找它们。从此错误可以看出： sqlalchemy.exc.OperationalError: (MySQLdb._exceptions.OperationalError) (1142,"SELECT command denied to user 'lif_1'@'localhost' for table 'user'")

[SQL: SELECT count(*) AS count_1 
FROM (SELECT lif_1.`character`.`ID` AS `lif_1_character_ID`,lif_1.`character`.`IsActive` AS `lif_1_character_IsActive`,lif_1.`character`.`Name` AS `lif_1_character_Name`,lif_1.`character`.`LastName` AS `lif_1_character_LastName`,lif_1.`character`.`GeoID` AS `lif_1_character_GeoID`,lif_1.`character`.`AccountID` AS `lif_1_character_AccountID`,lif_1.`character`.`GeoAlt` AS `lif_1_character_GeoAlt`,lif_1.`character`.`OffsetMmX` AS `lif_1_character_OffsetMmX`,lif_1.`character`.`OffsetMmY` AS `lif_1_character_OffsetMmY`,lif_1.`character`.`OffsetMmZ` AS `lif_1_character_OffsetMmZ`,lif_1.`character`.`RaceID` AS `lif_1_character_RaceID`,lif_1.`character`.`Alignment` AS `lif_1_character_Alignment`,lif_1.`character`.`CriminalSecondsLeft` AS `lif_1_character_CriminalSecondsLeft`,lif_1.`character`.`Strength` AS `lif_1_character_Strength`,lif_1.`character`.`StrengthLock` AS `lif_1_character_StrengthLock`,lif_1.`character`.`Agility` AS `lif_1_character_Agility`,lif_1.`character`.`AgilityLock` AS `lif_1_character_AgilityLock`,lif_1.`character`.`Intellect` AS `lif_1_character_Intellect`,lif_1.`character`.`IntellectLock` AS `lif_1_character_IntellectLock`,lif_1.`character`.`Willpower` AS `lif_1_character_Willpower`,lif_1.`character`.`WillpowerLock` AS `lif_1_character_WillpowerLock`,lif_1.`character`.`Constitution` AS `lif_1_character_Constitution`,lif_1.`character`.`ConstitutionLock` AS `lif_1_character_ConstitutionLock`,lif_1.`character`.`RootContainerID` AS `lif_1_character_RootContainerID`,lif_1.`character`.`EquipmentContainerID` AS `lif_1_character_EquipmentContainerID`,lif_1.`character`.`HardHP` AS `lif_1_character_HardHP`,lif_1.`character`.`HardStam` AS `lif_1_character_HardStam`,lif_1.`character`.`SoftHP` AS `lif_1_character_SoftHP`,lif_1.`character`.`SoftStam` AS `lif_1_character_SoftStam`,lif_1.`character`.`Luck` AS `lif_1_character_Luck`,lif_1.`character`.`HungerRate` AS `lif_1_character_HungerRate`,lif_1.`character`.`AlchemyHash` AS `lif_1_character_AlchemyHash`,lif_1.`character`.`VisibilityHash` AS `lif_1_character_VisibilityHash`,lif_1.`character`.appearance AS lif_1_character_appearance,lif_1.`character`.`GuildID` AS `lif_1_character_GuildID`,lif_1.`character`.`GuildRoleID` AS `lif_1_character_GuildRoleID`,lif_1.`character`.`TitleMessageID` AS `lif_1_character_TitleMessageID`,lif_1.`character`.`BindedObjectID` AS `lif_1_character_BindedObjectID`,lif_1.`character`.`RallyObjectID` AS `lif_1_character_RallyObjectID`,lif_1.`character`.`LastTimeUsedPraiseYourGodAbility` AS `lif_1_character_LastTimeUsedPraiseYourGodAbility`,lif_1.`character`.`LastTimeUsedTransmuteIntoGold` AS `lif_1_character_LastTimeUsedTransmuteIntoGold`,lif_1.`character`.`CreateTimestamp` AS `lif_1_character_CreateTimestamp`,lif_1.`character`.`DeleteTimestamp` AS `lif_1_character_DeleteTimestamp` 
FROM lif_1.`character` INNER JOIN lif_1.account ON lif_1.account.`ID` = lif_1.`character`.`AccountID` INNER JOIN fightclub.user ON fightclub.user.steam_id = lif_1.account.`SteamID` ORDER BY lif_1.account.`ID` DESC) AS anon_1]
(Background on this error at: http://sqlalche.me/e/13/e3q8)

所以select语句可以工作，但它仍然只在一个数据库上查找而忽略绑定。

class User(SurrogatePK,Model,UserMixin):
    """A user of the app."""

    __tablename__ = 'user'
    __table_args__ = {'schema': 'fightclub'}
    __bind__ = 'fightclub'

    steam_id = Column(db.String(40))
    ...

class Account(db.Model):
    __tablename__ = 'account'
    __bind_key__ = 'feudal'
    __table_args__ = {'schema': 'lif_1'}

    ID = db.Column(db.Integer,primary_key=True)
    IsActive = db.Column(db.Integer,nullable=False)
    IsGM = db.Column(db.Integer,nullable=False)
    SteamID = db.Column(db.BigInteger,nullable=False,unique=True)