The wizard can be used to define commands that execute direct SQL or commands that call stored procedures.
该向导可以用于定义直接执行 SQL 或调用存储过程的命令。
One of the core advantages of Rails migrations is that you don't need to use direct SQL syntax to create your tables.
Rails迁移的一个核心优势就是不需要使用直接的sql语法来创建表。
Rails migrations allow direct SQL for unsupported extensions (such as stored procedures or constraints), while some ORM mappers don't.
Rails迁移允许对不支持的扩展(例如存储过程或约束)直接使用SQL,而有些OR m映射器不支持。
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