mirror of https://gitee.com/bigwinds/arangodb
Documentation improvements
This commit is contained in:
Simran Brucherseifer
parent
0bcd75921f
commit
659a45d3a8
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@ -36,76 +36,76 @@ for brevity as well.
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Some of the following example queries are executed on a collection *users*
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with the following initial data:
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```js
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```json
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[
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{ "id" : 100, "name" : "John", "age" : 37, "active" : true, "gender" : "m" },
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{ "id" : 101, "name" : "Fred", "age" : 36, "active" : true, "gender" : "m" },
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{ "id" : 102, "name" : "Jacob", "age" : 35, "active" : false, "gender" : "m" },
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{ "id" : 103, "name" : "Ethan", "age" : 34, "active" : false, "gender" : "m" },
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{ "id" : 104, "name" : "Michael", "age" : 33, "active" : true, "gender" : "m" },
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{ "id" : 105, "name" : "Alexander", "age" : 32, "active" : true, "gender" : "m" },
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{ "id" : 106, "name" : "Daniel", "age" : 31, "active" : true, "gender" : "m" },
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{ "id" : 107, "name" : "Anthony", "age" : 30, "active" : true, "gender" : "m" },
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{ "id" : 108, "name" : "Jim", "age" : 29, "active" : true, "gender" : "m" },
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{ "id" : 109, "name" : "Diego", "age" : 28, "active" : true, "gender" : "m" },
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{ "id" : 200, "name" : "Sophia", "age" : 37, "active" : true, "gender" : "f" },
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{ "id" : 201, "name" : "Emma", "age" : 36, "active" : true, "gender" : "f" },
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{ "id" : 202, "name" : "Olivia", "age" : 35, "active" : false, "gender" : "f" },
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{ "id" : 203, "name" : "Madison", "age" : 34, "active" : true, "gender": "f" },
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{ "id" : 204, "name" : "Chloe", "age" : 33, "active" : true, "gender" : "f" },
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{ "id" : 205, "name" : "Eva", "age" : 32, "active" : false, "gender" : "f" },
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{ "id" : 206, "name" : "Abigail", "age" : 31, "active" : true, "gender" : "f" },
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{ "id" : 207, "name" : "Isabella", "age" : 30, "active" : true, "gender" : "f" },
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{ "id" : 208, "name" : "Mary", "age" : 29, "active" : true, "gender" : "f" },
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{ "id" : 209, "name" : "Mariah", "age" : 28, "active" : true, "gender" : "f" }
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{ "id": 100, "name": "John", "age": 37, "active": true, "gender": "m" },
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{ "id": 101, "name": "Fred", "age": 36, "active": true, "gender": "m" },
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{ "id": 102, "name": "Jacob", "age": 35, "active": false, "gender": "m" },
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{ "id": 103, "name": "Ethan", "age": 34, "active": false, "gender": "m" },
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{ "id": 104, "name": "Michael", "age": 33, "active": true, "gender": "m" },
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{ "id": 105, "name": "Alexander", "age": 32, "active": true, "gender": "m" },
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{ "id": 106, "name": "Daniel", "age": 31, "active": true, "gender": "m" },
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{ "id": 107, "name": "Anthony", "age": 30, "active": true, "gender": "m" },
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{ "id": 108, "name": "Jim", "age": 29, "active": true, "gender": "m" },
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{ "id": 109, "name": "Diego", "age": 28, "active": true, "gender": "m" },
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{ "id": 200, "name": "Sophia", "age": 37, "active": true, "gender": "f" },
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{ "id": 201, "name": "Emma", "age": 36, "active": true, "gender": "f" },
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{ "id": 202, "name": "Olivia", "age": 35, "active": false, "gender": "f" },
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{ "id": 203, "name": "Madison", "age": 34, "active": true, "gender": "f" },
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{ "id": 204, "name": "Chloe", "age": 33, "active": true, "gender": "f" },
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{ "id": 205, "name": "Eva", "age": 32, "active": false, "gender": "f" },
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{ "id": 206, "name": "Abigail", "age": 31, "active": true, "gender": "f" },
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{ "id": 207, "name": "Isabella", "age": 30, "active": true, "gender": "f" },
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{ "id": 208, "name": "Mary", "age": 29, "active": true, "gender": "f" },
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{ "id": 209, "name": "Mariah", "age": 28, "active": true, "gender": "f" }
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]
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```
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For some of the examples, we'll also use a collection *relations* to store
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relationships between users. The example data for *relations* are as follows:
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```js
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```json
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[
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{ "from" : 209, "to" : 205, "type" : "friend" },
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{ "from" : 206, "to" : 108, "type" : "friend" },
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{ "from" : 202, "to" : 204, "type" : "friend" },
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{ "from" : 200, "to" : 100, "type" : "friend" },
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{ "from" : 205, "to" : 101, "type" : "friend" },
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{ "from" : 209, "to" : 203, "type" : "friend" },
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{ "from" : 200, "to" : 203, "type" : "friend" },
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{ "from" : 100, "to" : 208, "type" : "friend" },
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{ "from" : 101, "to" : 209, "type" : "friend" },
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{ "from" : 206, "to" : 102, "type" : "friend" },
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{ "from" : 104, "to" : 100, "type" : "friend" },
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{ "from" : 104, "to" : 108, "type" : "friend" },
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{ "from" : 108, "to" : 209, "type" : "friend" },
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{ "from" : 206, "to" : 106, "type" : "friend" },
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{ "from" : 204, "to" : 105, "type" : "friend" },
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{ "from" : 208, "to" : 207, "type" : "friend" },
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{ "from" : 102, "to" : 108, "type" : "friend" },
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{ "from" : 207, "to" : 203, "type" : "friend" },
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{ "from" : 203, "to" : 106, "type" : "friend" },
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{ "from" : 202, "to" : 108, "type" : "friend" },
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{ "from" : 201, "to" : 203, "type" : "friend" },
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{ "from" : 105, "to" : 100, "type" : "friend" },
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{ "from" : 100, "to" : 109, "type" : "friend" },
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{ "from" : 207, "to" : 109, "type" : "friend" },
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{ "from" : 103, "to" : 203, "type" : "friend" },
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{ "from" : 208, "to" : 104, "type" : "friend" },
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{ "from" : 105, "to" : 104, "type" : "friend" },
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{ "from" : 103, "to" : 208, "type" : "friend" },
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{ "from" : 203, "to" : 107, "type" : "boyfriend" },
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{ "from" : 107, "to" : 203, "type" : "girlfriend" },
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{ "from" : 208, "to" : 109, "type" : "boyfriend" },
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{ "from" : 109, "to" : 208, "type" : "girlfriend" },
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{ "from" : 106, "to" : 205, "type" : "girlfriend" },
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{ "from" : 205, "to" : 106, "type" : "boyfriend" },
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{ "from" : 103, "to" : 209, "type" : "girlfriend" },
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{ "from" : 209, "to" : 103, "type" : "boyfriend" },
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{ "from" : 201, "to" : 102, "type" : "boyfriend" },
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{ "from" : 102, "to" : 201, "type" : "girlfriend" },
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{ "from" : 206, "to" : 100, "type" : "boyfriend" },
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{ "from" : 100, "to" : 206, "type" : "girlfriend" }
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{ "from": 209, "to": 205, "type": "friend" },
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{ "from": 206, "to": 108, "type": "friend" },
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{ "from": 202, "to": 204, "type": "friend" },
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{ "from": 200, "to": 100, "type": "friend" },
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{ "from": 205, "to": 101, "type": "friend" },
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{ "from": 209, "to": 203, "type": "friend" },
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{ "from": 200, "to": 203, "type": "friend" },
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{ "from": 100, "to": 208, "type": "friend" },
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{ "from": 101, "to": 209, "type": "friend" },
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{ "from": 206, "to": 102, "type": "friend" },
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{ "from": 104, "to": 100, "type": "friend" },
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{ "from": 104, "to": 108, "type": "friend" },
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{ "from": 108, "to": 209, "type": "friend" },
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{ "from": 206, "to": 106, "type": "friend" },
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{ "from": 204, "to": 105, "type": "friend" },
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{ "from": 208, "to": 207, "type": "friend" },
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{ "from": 102, "to": 108, "type": "friend" },
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{ "from": 207, "to": 203, "type": "friend" },
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{ "from": 203, "to": 106, "type": "friend" },
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{ "from": 202, "to": 108, "type": "friend" },
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{ "from": 201, "to": 203, "type": "friend" },
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{ "from": 105, "to": 100, "type": "friend" },
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{ "from": 100, "to": 109, "type": "friend" },
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{ "from": 207, "to": 109, "type": "friend" },
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{ "from": 103, "to": 203, "type": "friend" },
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{ "from": 208, "to": 104, "type": "friend" },
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{ "from": 105, "to": 104, "type": "friend" },
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{ "from": 103, "to": 208, "type": "friend" },
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{ "from": 203, "to": 107, "type": "boyfriend" },
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{ "from": 107, "to": 203, "type": "girlfriend" },
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{ "from": 208, "to": 109, "type": "boyfriend" },
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{ "from": 109, "to": 208, "type": "girlfriend" },
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{ "from": 106, "to": 205, "type": "girlfriend" },
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{ "from": 205, "to": 106, "type": "boyfriend" },
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{ "from": 103, "to": 209, "type": "girlfriend" },
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{ "from": 209, "to": 103, "type": "boyfriend" },
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{ "from": 201, "to": 102, "type": "boyfriend" },
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{ "from": 102, "to": 201, "type": "girlfriend" },
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{ "from": 206, "to": 100, "type": "boyfriend" },
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{ "from": 100, "to": 206, "type": "girlfriend" }
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]
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```
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@ -39,17 +39,6 @@ APPEND([ 1, 2, 3 ], [ 3, 4, 5, 2, 9 ], true)
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This is an alias for [LENGTH()](#length).
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!SUBSECTION OUTERSECTION()
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`OUTERSECTION(array1, array2, ... arrayN) → newArray`
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Return the values that occur only once across all arrays specified.
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- **arrays** (array, *repeatable*): an arbitrary number of arrays as multiple arguments
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(at least 2)
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- returns **newArray** (array): a single array with only the elements that exist only once
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across all provided arrays. The element order is random.
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!SUBSECTION FIRST()
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`FIRST(anyArray) → firstElement`
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@ -125,8 +114,8 @@ collection and the [character length](String.md#length) of a string.
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Return the difference of all arrays specified.
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- **arrays** (array, *repeatable*): an arbitrary of arrays as multiple arguments,
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at least two
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- **arrays** (array, *repeatable*): an arbitrary number of arrays as multiple
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arguments (at least 2)
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- returns **newArray** (array): an array of values that occur in the first array,
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but not in any of the subsequent arrays. The order of the result array is undefined
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and should not be relied on. Duplicates will be removed.
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@ -144,6 +133,28 @@ for positive positions, but does not support negative positions.
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If *position* is negative or beyond the upper bound of the array,
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then *null* will be returned.
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```js
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NTH( [ "foo", "bar", "baz" ], 2 ) // "baz"
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NTH( [ "foo", "bar", "baz" ], 3 ) // null
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NTH( [ "foo", "bar", "baz" ], -1 ) // null
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```
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!SUBSECTION OUTERSECTION()
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`OUTERSECTION(array1, array2, ... arrayN) → newArray`
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Return the values that occur only once across all arrays specified.
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- **arrays** (array, *repeatable*): an arbitrary number of arrays as multiple arguments
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(at least 2)
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- returns **newArray** (array): a single array with only the elements that exist only once
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across all provided arrays. The element order is random.
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```js
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OUTERSECTION( [ 1, 2, 3 ], [ 2, 3, 4 ], [ 3, 4, 5 ] )
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// [ 1, 5 ]
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```
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!SUBSECTION POP()
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`POP(anyArray) → newArray`
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@ -309,7 +320,7 @@ SLICE( [ 1, 2, 3, 4, 5 ], -3, 2 ) // [ 3, 4 ]
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Return the union of all arrays specified.
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- **arrays** (array, *repeatable*): an arbitrary number of arrays as multiple
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arguments, at least 2
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arguments (at least 2)
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- returns **newArray** (array): all array elements combined in a single array,
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in any order
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@ -342,7 +353,7 @@ UNIQUE(
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Return the union of distinct values of all arrays specified.
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- **arrays** (array, *repeatable*): an arbitrary number of arrays as multiple
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arguments, at least 2
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arguments (at least 2)
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- returns **newArray** (array): the elements of all given arrays in a single
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array, without duplicates, in any order
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@ -208,7 +208,7 @@ of the documents contained later in the argument list.
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- **documents** (object, *repeatable*): an arbitrary number of documents as
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multiple arguments, at least 2
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multiple arguments (at least 2)
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- returns **mergedDocument** (object): a combined document
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Note that merging will only be done for top-level attributes. If you wish to
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@ -273,7 +273,7 @@ If document attribute keys are ambiguous, the merged result will contain the val
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of the documents contained later in the argument list.
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- **documents** (object, *repeatable*): an arbitrary number of documents as
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multiple arguments, at least 2
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multiple arguments (at least 2)
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- returns **mergedDocument** (object): a combined document
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For example, two documents with distinct attribute names can easily be merged into one:
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@ -346,7 +346,7 @@ All other attributes will be preserved.
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- **document** (object): a document / object
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- **attributeNames** (string, *repeatable*): an arbitrary number of attribute
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names as multiple arguments, at least 1
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names as multiple arguments (at least 1)
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- returns **doc** (object): *document* without the specified attributes on the
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top-level
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@ -374,7 +374,7 @@ Recursively remove the attributes *attributeName1* to *attributeNameN* from
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- **document** (object): a document / object
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- **attributeNames** (string, *repeatable*): an arbitrary number of attribute
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names as multiple arguments, at least 1
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names as multiple arguments (at least 1)
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- returns **doc** (object): *document* without the specified attributes on
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all levels (top-level as well as nested objects)
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@ -27,11 +27,9 @@ i.e. *LENGTH(foo)* and *length(foo)* are equivalent.
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!SUBSUBSECTION Extending AQL
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Since ArangoDB 1.3, it is possible to extend AQL with user-defined functions.
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These functions need to be written in JavaScript, and be registered before usage
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in a query.
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Please refer to [Extending AQL](../Extending/index.html) for more details on this.
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It is possible to extend AQL with user-defined functions. These functions need to
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be written in JavaScript, and be registered before usage in a query. Please refer
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to [Extending AQL](../Extending/index.html) for more details on this.
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By default, any function used in an AQL query will be sought in the built-in
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function namespace *_aql*. This is the default namespace that contains all AQL
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@ -15,7 +15,7 @@ This is a synonym for [LENGTH()](#length).
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Concatenate the values passed as *value1* to *valueN*.
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- **values** (any, *repeatable*): elements of arbitrary type, at least one
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- **values** (any, *repeatable*): elements of arbitrary type (at least 1)
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- returns **str** (string): a concatenation of the elements. *null* values
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are ignored.
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@ -47,7 +47,7 @@ Concatenate the strings passed as arguments *value1* to *valueN* using the
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- **separator** (string): an arbitrary separator string
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- **values** (string|array, *repeatable*): strings or arrays of strings as multiple
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arguments, at least one
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arguments (at least 1)
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- returns **joinedString** (string): a concatenated string of the elements, using
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*separator* as separator string. *null* values are ignored. Array value arguments
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are expanded automatically, and their individual members will be concatenated.
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@ -1,7 +1,9 @@
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!CHAPTER FILTER
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The *FILTER* statement can be used to restrict the results to elements that
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match an arbitrary logical condition. The general syntax is:
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match an arbitrary logical condition.
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!SECTION General syntax
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```
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FILTER condition
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@ -22,7 +24,7 @@ FOR u IN users
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It is allowed to specify multiple *FILTER* statements in a query, even in
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the same block. If multiple *FILTER* statements are used, their results will be
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combined with a logical and, meaning all filter conditions must be true to
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combined with a logical AND, meaning all filter conditions must be true to
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include an element.
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```
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@ -32,29 +34,32 @@ FOR u IN users
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RETURN u
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```
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In the above example, will be included in the result all array elements from *users* that have
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an attribute *active* with value *true* and that have an attribute *age* with a
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value less than *39* (including *null* ones). All other elements from *users*
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will be skipped and not be included in the result produced by *RETURN*.
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You may refer to the chapter [Accessing Data from Collections](../Fundamentals/DocumentData.md) for
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a description of the impact of non-existent or null attributes.
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In the above example, all array elements of *users* that have an attribute
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*active* with value *true* and that have an attribute *age* with a value less
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than *39* (including *null* ones) will be included in the result. All other
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elements of *users* will be skipped and not be included in the result produced
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by *RETURN*. You may refer to the chapter [Accessing Data from Collections](../Fundamentals/DocumentData.md)
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for a description of the impact of non-existent or null attributes.
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!SECTION Order of operations
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Note that the positions of *FILTER* statements can influence the result of a query.
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There are 16 active users in the test data for instance:
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There are 16 active users in the [test data](../Examples/README.md#example-data)
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for instance:
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```js
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FOR u IN users
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FILTER u.active == true
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RETURN u
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FILTER u.active == true
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RETURN u
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```
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We can limit the result set to 5 users at most:
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```js
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FOR u IN users
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FILTER u.active == true
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LIMIT 5
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RETURN u
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FILTER u.active == true
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LIMIT 5
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RETURN u
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```
|
||||
|
||||
This may return the user documents of Jim, Diego, Anthony, Michael and Chloe for
|
||||
|
|
@ -64,10 +69,10 @@ women...
|
|||
|
||||
```js
|
||||
FOR u IN users
|
||||
FILTER u.active == true
|
||||
LIMIT 5
|
||||
FILTER u.gender == "f"
|
||||
RETURN u
|
||||
FILTER u.active == true
|
||||
LIMIT 5
|
||||
FILTER u.gender == "f"
|
||||
RETURN u
|
||||
```
|
||||
|
||||
... it might just return the Chloe document, because the *LIMIT* is applied before
|
||||
|
|
@ -78,11 +83,11 @@ by adding a *SORT* block:
|
|||
|
||||
```js
|
||||
FOR u IN users
|
||||
FILTER u.active == true
|
||||
SORT u.age ASC
|
||||
LIMIT 5
|
||||
FILTER u.gender == "f"
|
||||
RETURN u
|
||||
FILTER u.active == true
|
||||
SORT u.age ASC
|
||||
LIMIT 5
|
||||
FILTER u.gender == "f"
|
||||
RETURN u
|
||||
```
|
||||
|
||||
This will return the users Mariah and Mary. If sorted by age in *DESC* order,
|
||||
|
|
@ -91,10 +96,10 @@ then the Sophia, Emma and Madison documents are returned. A *FILTER* after a
|
|||
|
||||
```js
|
||||
FOR u IN users
|
||||
FILTER u.active == true AND u.gender == "f"
|
||||
SORT u.age ASC
|
||||
LIMIT 5
|
||||
RETURN u
|
||||
FILTER u.active == true AND u.gender == "f"
|
||||
SORT u.age ASC
|
||||
LIMIT 5
|
||||
RETURN u
|
||||
```
|
||||
|
||||
The significance of where *FILTER* blocks are placed allows that this single
|
||||
|
|
|
|||
|
|
@ -2,9 +2,9 @@
|
|||
|
||||
The *LIMIT* statement allows slicing the result array using an
|
||||
offset and a count. It reduces the number of elements in the result to at most
|
||||
the specified number. Two general forms of *LIMIT* are followed:
|
||||
the specified number. Two general forms of *LIMIT* are followed:
|
||||
|
||||
```
|
||||
```js
|
||||
LIMIT count
|
||||
LIMIT offset, count
|
||||
```
|
||||
|
|
@ -14,13 +14,23 @@ allows specifying both *offset* and *count*. The first form is identical using
|
|||
the second form with an *offset* value of *0*.
|
||||
|
||||
The *offset* value specifies how many elements from the result shall be
|
||||
discarded. It must be 0 or greater. The *count* value specifies how many
|
||||
skipped. It must be 0 or greater. The *count* value specifies how many
|
||||
elements should be at most included in the result.
|
||||
|
||||
```
|
||||
```js
|
||||
FOR u IN users
|
||||
SORT u.firstName, u.lastName, u.id DESC
|
||||
LIMIT 0, 5
|
||||
RETURN u
|
||||
```
|
||||
|
||||
Note that variables and expressions can not be used for *offset* and *count*.
|
||||
Their values must be known at query compile time, which means that you can
|
||||
use number literals and bind parameters only.
|
||||
|
||||
Where a *LIMIT* is used in relation to other operations in a query has meaning.
|
||||
*LIMIT* operations before *FILTER*s in particular can change the result
|
||||
significantly, because the operations are executed in the order in which they
|
||||
are written in the query. See [FILTER](Filter.md#order-of-operations) for a
|
||||
detailed example.
|
||||
|
||||
|
|
@ -182,7 +182,6 @@ true && 23 // 23
|
|||
|
||||
Arithmetic operators perform an arithmetic operation on two numeric
|
||||
operands. The result of an arithmetic operation is again a numeric value.
|
||||
Operators are supported.
|
||||
|
||||
AQL supports the following arithmetic operators:
|
||||
|
||||
|
|
@ -236,7 +235,8 @@ applied by the [TO_NUMBER()](Functions/TypeCast.md#tonumber) function:
|
|||
- objects / documents are converted to the number `0`.
|
||||
|
||||
An arithmetic operation that produces an invalid value, such as `1 / 0` (division by zero)
|
||||
will also produce a result value of `null`.
|
||||
will also produce a result value of `null`. The query is not aborted, but you may see a
|
||||
warning.
|
||||
|
||||
Here are a few examples:
|
||||
|
||||
|
|
|
|||
|
|
@ -1,13 +1,6 @@
|
|||
!CHAPTER HTTP Interface for Documents
|
||||
|
||||
In this chapter we describe the REST API of ArangoDB for documents.
|
||||
We begin with a
|
||||
|
||||
- [section on the basic approach](AddressAndEtag.md)
|
||||
|
||||
before we proceed with
|
||||
|
||||
- [the detailed API description](WorkingWithDocuments.md),
|
||||
|
||||
which has all the gory details.
|
||||
|
||||
- [Basic approach](AddressAndEtag.md)
|
||||
- [Detailed API description](WorkingWithDocuments.md)
|
||||
|
|
|
|||
|
|
@ -76,7 +76,7 @@ response to the client instantly and thus finish this HTTP-request.
|
|||
The server will execute the tasks from the queue asynchronously as fast
|
||||
as possible, while clients can continue to do other work.
|
||||
If the server queue is full (i.e. contains as many tasks as specified by the
|
||||
option ["--scheduler.maximal-queue-size"](../../Manual/Administration/Configuration/Communication.html),
|
||||
option ["--scheduler.maximal-queue-size"](../../Manual/Administration/Configuration/Communication.html)),
|
||||
then the request will be rejected instantly with an *HTTP 500* (internal
|
||||
server error) response.
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue