Sequelize.js 提供对 MySQL，MariaDB，SQLite 和 PostgreSQL 数据库的简单访问，通过映射数据库条目到对象，或者对象到数据库条目。简而言之，就是 ORM（Object-Relational-Mapper）。Sequelize.js 完全是使用 JavaScript 编写，适用于 Node.js 的环境。
Sequelize 2.0.0RC7 发布，此版本现已提供下载：Sequelize 3.0.0.RC7.zip，主要更新内容如下：
[FEATURE] Throw an error if no where clause is given to Model.destroy().
[BUG] Fixed issue with order: sequelize.literal('string')
[FEATURE] add clone: true support to .get(). Is needed when using delete on values from a .get() (toJSON(), this.values). (.get() is just a reference to the values for performance reasons when there's no custom getters or includes)
[FEATURE] add sequelize.escape(value) convenience method
[BUG] Fixes crash with findAll({include: [Model], order: sequelize.literal()})
[FEATURE] Now possible to pass createdAt and updatedAt values to Model.create/Model.bulkCreate when using silent: true (when importing datasets with existing timestamps)
[FEATURE] instance.update() using default fields will now automatically also save and validate values provided via beforeUpdate hooks
[BUG] Fixed bad SQL when updating a JSON attribute with a different field
[BUG] Fixed issue with creating and updating values of a DataTypes.ARRAY(DataTypes.JSON) attribute
[BUG] Model.bulkCreate([{}], {returning: true}) will now correctly result in instances with primary key values.
[BUG] instance.save() with fields: [] (as a result of .changed() being []) will no result in a noop instead of an empty update query.
[BUG] Fixed case where findOrCreate could return [null, true] when given a defaults value that triggered a unique constraint error.
向后兼容改进
instance.update() using default fields will now automatically also save and validate values provided via beforeUpdate hooks
Sequelize no longer supports case insensitive mysql enums
更多内容请看更新日志。
软件详情：https://github.com/sequelize/sequelize/blob/master/changelog.md
下载地址：https://github.com/sequelize/sequelize/archive/v2.0.0-rc7.zip
来自:开源中国社区
