CouchDB Bulk Document APIs
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One of the key features of CouchDB is its ability to handle bulk operations on documents, which can significantly improve performance and reduce network overhead. In this article, we will explore some of the bulk document APIs available in CouchDB.
Bulk Document API: _bulk_docs
One of the most commonly used bulk document APIs in CouchDB is _bulk_docs. This API allows you to insert, update or delete multiple documents in a single request. The advantage of this approach is that it reduces the number of round trips between the client and server, which can significantly improve performance.
To use this API, you need to send an HTTP POST request with a JSON payload containing one or more document objects. Each document object must contain an _id field (if updating an existing document) and optionally a _rev field (if updating an existing document). For example:
{
"docs": [
{
"_id": "doc1",
"_rev": "1-abcdef", // optional
"name": "John",
"age": 30,
"city": "New York"
},
{
"_id": "doc2",
"_rev": "1-abcdef", // optional
"name": "Jane",
"age": 25,
"city": "San Francisco"
}
]
}
In this example, we are updating two documents with the _id and _rev fields. If you want to delete a document instead, you can simply omit the _id field from the document object. For example:
{
"docs": [
{
"_id": "doc1",
"_rev": "1-abcdef"
}
]
}
You can also use the _bulk_docs API to insert new documents. In this case, you need to set the _id field for each document object and omit the _rev field. For example:
{
"docs": [
{
"_id": "doc3",
"name": "Bob",
"age": 40,
"city": "Los Angeles"
},
{
"_id": "doc4",
"name": "Alice",
"age": 50,
"city": "Chicago"
}
]
}
In addition to the _bulk_docs API, CouchDB provides several other bulk document APIs that allow you to perform different operations on multiple documents in a single request. These include:
_find
: allows you to query multiple documents and return a JSON object containing the results_list
: returns a list of all documents that match certain criteria_search
: allows you to perform full-text search queries on multiple documents
Conclusion
CouchDB provides several powerful APIs for performing bulk operations on documents, which can significantly improve performance and reduce network overhead. The _bulk_docs API is one of the most commonly used APIs and allows you to insert, update or delete multiple documents in a single request. By using these APIs effectively, you can develop efficient and scalable applications that take full advantage of CouchDB's capabilities.
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