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Add dynamically referenced labels and types to allowed parameters #1143

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Merged
merged 3 commits into from
Jan 7, 2025
Merged

Add dynamically referenced labels and types to allowed parameters #1143

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cde7b3e
add dynamic referencing
JPryce-Aklundh Jan 7, 2025
7d07511
add properties
JPryce-Aklundh Jan 7, 2025
8013136
fix xref
JPryce-Aklundh Jan 7, 2025
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11 changes: 6 additions & 5 deletions modules/ROOT/pages/syntax/parameters.adoc
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Expand Up @@ -15,14 +15,15 @@ Additionally, parameters make caching of execution plans much easier for Cypher,

Parameters can be used for:

* literals and expressions
* node and relationship ids
* Literals and expressions.
* Node and relationship ids.
* Node labels and relationship types, when referenced dynamically (for more information, see xref:clauses/match.adoc#dynamic-match[`MATCH` using dynamic node labels and relationship types]). label:new[Introduced in 5.26]

Parameters cannot be used for the following constructs, as these form part of the query structure that is compiled into a query plan:

* property keys; so `MATCH (n) WHERE n.$param = 'something'` is invalid
* relationship types; so `MATCH (n)-[:$param]->(m)` is invalid
* labels; so `MATCH (n:$param)` is invalid
* Property keys; `MATCH (n) WHERE n.$param = 'something'` is invalid.
* Relationship types; `MATCH (n)-[:$param]->(m)` is invalid.
* Node labels; `MATCH (n:$param)` is invalid.

Parameters may consist of letters and numbers, and any combination of these, but cannot start with a number or a currency symbol.

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