Sequelize 是一个易用且基于 promise 的 [Node.js](https://nodejs.org/en/about/) [ORM 工具](https://en.wikipedia.org/wiki/Object-relational_mapping) 适用于 [Postgres](https://en.wikipedia.org/wiki/PostgreSQL), [MySQL](https://en.wikipedia.org/wiki/MySQL), [MariaDB](https://en.wikipedia.org/wiki/MariaDB), [SQLite](https://en.wikipedia.org/wiki/SQLite), [DB2](https://en.wikipedia.org/wiki/IBM_Db2_Family), [Microsoft SQL Server](https://en.wikipedia.org/wiki/Microsoft_SQL_Server), [Snowflake](https://www.snowflake.com/), [Oracle DB](https://www.oracle.com/database/) 和 [Db2 for IBM i](https://www.ibm.com/support/pages/db2-ibm-i). 它具有强大的事务支持, 关联关系, 预读和延迟加载,读取复制等功能.
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