服务实现查询使用密钥查询提供者，并获得与该密钥关联的对应数据对象。
The service implementation queries the provider using the key and gets the corresponding data object associated with that key.
每个字符串都是一个商品的名称，关联数组中的对应数字就是购物车中该商品的数量。
Each string is the name of an item, and the corresponding number in the associative array is the quantity of that item in the cart.
规则应被顺利执行，一个对应于关联计划的新文件应在你的工作环境中出现。
The rules should execute without a problem, and a new file corresponding to the relational schema should appear in your workbench.
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