A JSON-LD Context
for the query. In an API, this will frequently be implicit. For example,
using json-rql as the body of a POST to
http://example.com/my-api/v1/person/query might have the implicit context
of a Person (possibly found at http://example.com/my-api/v1/person).
Subjects with properties to be deleted from the domain. Variables can be
used without a @where clause, to match any value.
Subjects with properties to be inserted into the domain. If variables are
used, then a @where clause must be supplied to provide matching values.
The data pattern to match, as a set of subjects or a group. Variables are used as placeholders to capture matching properties and values in the domain.
Match a subject by its @id
{
...
"@where": { "@id": "fred" }
}
Match a subject where any property has a given value
{
...
"@where": {
"@id": "?id",
"?prop": "Bedrock"
}
}
Match a subject with a given property, having any value
{
...
"@where": {
"@id": "?id",
"name": "?name"
}
}
The Javascript engine supports exact-matches for subject identities, properties and values. Inline filters will be available in future.
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A pattern to update the properties of matching subjects in the domain.
Examples:
Delete a subject property
{ "@delete": { "@id": "fred", "name": "Fred" } }Delete a property, where another property has a value
{ "@delete": { "@id": "?id", "age": "?any" }, "@where": { "@id": "?id", "name": "Fred", "age": "?any" } }Update a subject property
{ "@delete": { "@id": "fred", "name": "Fred" }, "@insert": { "@id": "fred", "name": "Fred Flintstone" } }Replace all of a subject's properties
{ "@delete": { "@id": "fred", "?prop": "?value" }, "@insert": { "@id": "fred", "age": 50, "name": "Fred Flintstone" } }json-rql update