While this is almost there, there is one final item. If there is a conflict, the server version of the document should be returned. That means the 409 and 412 responses need to return convertItem(document) instead a simple change.

Deleting a Record

Deleting a record does not delete a record. Azure Mobile Apps uses soft delete (whereby the deleted flag is set to true). This means that I need to use replaceDocument() again for deletions:

function deleteItem(req, res, id) {
driver.fetchDocument(refs.client, refs.table, id)
.then((document) => {
if (typeof document === 'undefined') {res.status(404).json({ 'error': 'Not Found' });return;
}
var item = convertItem(document);
delete item.updatedAt;
delete item.version;
item.deleted = true;
driver.replaceDocument(refs.client, document._self, item)
.then((updatedDocument) => {res.status(200).json(convertItem(updatedDocument));return;
});
})
.catch((error) => {
res.status(error.code).json(convertError(error));
});
}

This brings up a point about the GetOneItem() method. It does not take into account the deleted flag. I need it to return 404 Not Found if the deleted flag is set:

function getOneItem(req, res, id) {
driver.fetchDocument(refs.client, refs.table, id)
.then((document) => {
if (typeof document === 'undefined' || document.deleted === true)res.status(404).json({ 'error': 'Not Found' });
elseres.status(200).json(convertItem(document));
})
.catch((error) => {
res.status(error.code).json(convertError(error));
});
}

It’s a simple change, but important in getting the protocol right.

What’s left?

There is only one method I have not written yet, and it’s the biggest one of the set the getAllItems() method. That’s because it deals with OData querying, which is no small task. I’ll be tackling that in my next article. Until then, get the current codebase at my GitHub repository .

本文数据库（综合）相关术语:系统安全软件

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