193 lines
7.1 KiB
Plaintext
193 lines
7.1 KiB
Plaintext
[role="xpack"]
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[testenv="basic"]
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[[sql-rest]]
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== SQL REST API
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beta[]
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The SQL REST API accepts SQL in a JSON document, executes it,
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and returns the results. For example:
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[source,js]
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--------------------------------------------------
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POST /_sql?format=txt
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{
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"query": "SELECT * FROM library ORDER BY page_count DESC LIMIT 5"
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}
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--------------------------------------------------
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// CONSOLE
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// TEST[setup:library]
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Which returns:
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[source,text]
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--------------------------------------------------
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author | name | page_count | release_date
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-----------------+--------------------+---------------+------------------------
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Peter F. Hamilton|Pandora's Star |768 |2004-03-02T00:00:00.000Z
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Vernor Vinge |A Fire Upon the Deep|613 |1992-06-01T00:00:00.000Z
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Frank Herbert |Dune |604 |1965-06-01T00:00:00.000Z
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Alastair Reynolds|Revelation Space |585 |2000-03-15T00:00:00.000Z
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James S.A. Corey |Leviathan Wakes |561 |2011-06-02T00:00:00.000Z
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--------------------------------------------------
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// TESTRESPONSE[s/\|/\\|/ s/\+/\\+/]
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// TESTRESPONSE[_cat]
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While the `text/plain` format is nice for humans, computers prefer something
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more structured. You can replace the value of `format` with:
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- `json` aka `application/json`
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- `yaml` aka `application/yaml`
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- `smile` aka `application/smile`
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- `cbor` aka `application/cbor`
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- `txt` aka `text/plain`
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- `csv` aka `text/csv`
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- `tsv` aka `text/tab-separated-values`
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Alternatively you can set the `Accept` HTTP header to the appropriate media
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format. The GET parameter takes precedence over the header. If neither is
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specified then the response is returned in the same format as the request.
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[source,js]
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--------------------------------------------------
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POST /_sql?format=json
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{
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"query": "SELECT * FROM library ORDER BY page_count DESC",
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"fetch_size": 5
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}
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--------------------------------------------------
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// CONSOLE
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// TEST[setup:library]
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Which returns:
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[source,js]
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--------------------------------------------------
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{
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"columns": [
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{"name": "author", "type": "text"},
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{"name": "name", "type": "text"},
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{"name": "page_count", "type": "short"},
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{"name": "release_date", "type": "datetime"}
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],
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"rows": [
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["Peter F. Hamilton", "Pandora's Star", 768, "2004-03-02T00:00:00.000Z"],
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["Vernor Vinge", "A Fire Upon the Deep", 613, "1992-06-01T00:00:00.000Z"],
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["Frank Herbert", "Dune", 604, "1965-06-01T00:00:00.000Z"],
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["Alastair Reynolds", "Revelation Space", 585, "2000-03-15T00:00:00.000Z"],
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["James S.A. Corey", "Leviathan Wakes", 561, "2011-06-02T00:00:00.000Z"]
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],
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"cursor": "sDXF1ZXJ5QW5kRmV0Y2gBAAAAAAAAAAEWWWdrRlVfSS1TbDYtcW9lc1FJNmlYdw==:BAFmBmF1dGhvcgFmBG5hbWUBZgpwYWdlX2NvdW50AWYMcmVsZWFzZV9kYXRl+v///w8="
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}
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--------------------------------------------------
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// TESTRESPONSE[s/sDXF1ZXJ5QW5kRmV0Y2gBAAAAAAAAAAEWWWdrRlVfSS1TbDYtcW9lc1FJNmlYdw==:BAFmBmF1dGhvcgFmBG5hbWUBZgpwYWdlX2NvdW50AWYMcmVsZWFzZV9kYXRl\+v\/\/\/w8=/$body.cursor/]
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You can continue to the next page by sending back the `cursor` field. In
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case of text format the cursor is returned as `Cursor` http header.
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[source,js]
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--------------------------------------------------
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POST /_sql?format=json
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{
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"cursor": "sDXF1ZXJ5QW5kRmV0Y2gBAAAAAAAAAAEWYUpOYklQMHhRUEtld3RsNnFtYU1hQQ==:BAFmBGRhdGUBZgVsaWtlcwFzB21lc3NhZ2UBZgR1c2Vy9f///w8="
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}
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--------------------------------------------------
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// CONSOLE
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// TEST[continued]
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// TEST[s/sDXF1ZXJ5QW5kRmV0Y2gBAAAAAAAAAAEWYUpOYklQMHhRUEtld3RsNnFtYU1hQQ==:BAFmBGRhdGUBZgVsaWtlcwFzB21lc3NhZ2UBZgR1c2Vy9f\/\/\/w8=/$body.cursor/]
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Which looks like:
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[source,js]
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--------------------------------------------------
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{
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"rows" : [
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["Dan Simmons", "Hyperion", 482, "1989-05-26T00:00:00.000Z"],
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["Iain M. Banks", "Consider Phlebas", 471, "1987-04-23T00:00:00.000Z"],
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["Neal Stephenson", "Snow Crash", 470, "1992-06-01T00:00:00.000Z"],
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["Frank Herbert", "God Emperor of Dune", 454, "1981-05-28T00:00:00.000Z"],
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["Frank Herbert", "Children of Dune", 408, "1976-04-21T00:00:00.000Z"]
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],
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"cursor" : "sDXF1ZXJ5QW5kRmV0Y2gBAAAAAAAAAAEWODRMaXBUaVlRN21iTlRyWHZWYUdrdw==:BAFmBmF1dGhvcgFmBG5hbWUBZgpwYWdlX2NvdW50AWYMcmVsZWFzZV9kYXRl9f///w8="
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}
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--------------------------------------------------
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// TESTRESPONSE[s/sDXF1ZXJ5QW5kRmV0Y2gBAAAAAAAAAAEWODRMaXBUaVlRN21iTlRyWHZWYUdrdw==:BAFmBmF1dGhvcgFmBG5hbWUBZgpwYWdlX2NvdW50AWYMcmVsZWFzZV9kYXRl9f\/\/\/w8=/$body.cursor/]
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Note that the `column` object is only part of the first page.
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You've reached the last page when there is no `cursor` returned
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in the results. Like Elasticsearch's <<search-request-scroll,scroll>>,
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SQL may keep state in Elasticsearch to support the cursor. Unlike
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scroll, receiving the last page is enough to guarantee that the
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Elasticsearch state is cleared.
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To clear the state earlier, you can use the clear cursor command:
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[source,js]
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--------------------------------------------------
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POST /_sql/close
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{
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"cursor": "sDXF1ZXJ5QW5kRmV0Y2gBAAAAAAAAAAEWYUpOYklQMHhRUEtld3RsNnFtYU1hQQ==:BAFmBGRhdGUBZgVsaWtlcwFzB21lc3NhZ2UBZgR1c2Vy9f///w8="
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}
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--------------------------------------------------
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// CONSOLE
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// TEST[continued]
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// TEST[s/sDXF1ZXJ5QW5kRmV0Y2gBAAAAAAAAAAEWYUpOYklQMHhRUEtld3RsNnFtYU1hQQ==:BAFmBGRhdGUBZgVsaWtlcwFzB21lc3NhZ2UBZgR1c2Vy9f\/\/\/w8=/$body.cursor/]
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Which will like return the
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[source,js]
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--------------------------------------------------
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{
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"succeeded" : true
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}
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--------------------------------------------------
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// TESTRESPONSE
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[[sql-rest-filtering]]
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You can filter the results that SQL will run on using a standard
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Elasticsearch query DSL by specifying the query in the filter
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parameter.
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[source,js]
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--------------------------------------------------
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POST /_sql?format=txt
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{
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"query": "SELECT * FROM library ORDER BY page_count DESC",
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"filter": {
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"range": {
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"page_count": {
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"gte" : 100,
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"lte" : 200
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}
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}
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},
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"fetch_size": 5
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}
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--------------------------------------------------
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// CONSOLE
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// TEST[setup:library]
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Which returns:
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[source,text]
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--------------------------------------------------
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author | name | page_count | release_date
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---------------+------------------------------------+---------------+------------------------
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Douglas Adams |The Hitchhiker's Guide to the Galaxy|180 |1979-10-12T00:00:00.000Z
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--------------------------------------------------
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// TESTRESPONSE[s/\|/\\|/ s/\+/\\+/]
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// TESTRESPONSE[_cat]
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[[sql-rest-fields]]
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In addition to the `query` and `cursor` fields, the request can
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contain `fetch_size` and `time_zone`. `fetch_size` is a hint for how
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many results to return in each page. SQL might chose to return more
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or fewer results though. `time_zone` is the time zone to use for datetime
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functions and datetime parsing. `time_zone` defaults to `utc` and can take
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any values documented
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http://www.joda.org/joda-time/apidocs/org/joda/time/DateTimeZone.html[here].
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