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抽取模型建模的过程大致与直连模式相同，请您参考直连模型的具体介绍模型建模。
以下为与直连模型的不同点：
对于已经加载完毕的表，不能再新增实体列。
对于已经加载完毕的表，支持重新配置表，重新配置的过程与获取数据时基本相同，如修改数据源、实体信息、实体列等。
对于已经加载完毕的表，删除表或删除表中的列都会直接作用于缓存数据库并自动保存。
对于已经加载完毕的表，预览时读取缓存数据库中的数据。
模型中可以包括多个数据源的表，不同数据源的表之间可以互相关联，创建关系。
JSON 数据源中带参数的数据表在抽取模型中不可用。
type=info
提示
由于缓存数据库的限制，在抽取模型中，关系两侧列的类型必须完全一致。
缓存模式的文档具有排他性，同一时间只能有一个用户对其进行编辑。为了避免文档被搁置导致文档长时间被锁，超过一定时间后不活跃的文档（浏览器被最小化或浏览器当前页面为浏览器的其他Tab页）的独占锁会被丢弃。此时若继续编辑，系统会自动重新请求锁，若请求失败（网络问题或者锁已被占有），您可以选择等待一段时间手动重试或者关闭文档。
