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WebAPI/DataStore: Difference between revisions
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→Incremental Schema
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== Incremental Schema == | == Incremental Schema == | ||
DataStore is designed for sharing data among applications. Applications will make some assumptions on data types of attributes | DataStore is designed for sharing data among applications. Applications will make some assumptions on data types of attributes. If the data type of an attributes is not consistent among applications, applications may be broken. So, data types of attributes should be enforced. | ||
to define types of an attributes while attributes with a new path were found first time. In another word, once a new object was added to a data store, its tree of attributes will be traveled, and define the type of new found attributes with the type of their values. | |||
For example, if the following object is the object been added to a data store. | For example, if the following object is the object been added to a data store. | ||
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} | } | ||
Then, the table of | Then, the types table of the data store is | ||
SN: Integer | SN: Integer | ||
name: String | name: String | ||
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} | } | ||
The table | The types table should be | ||
SN: Integer | SN: Integer | ||
name: String | name: String | ||
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info phone: String | info phone: String | ||
Every time a new object was added to a data store, the types of attributes | Every time a new object was added to a data store, the types of attributes would be checked against the types table of the data store. The action of adding will be failed if the type of any attribute does not match the type defined in the types table. | ||
== Issues == | == Issues == | ||