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HHH-16801 document 'is true', 'is not true', 'is false', 'is not false' operators

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Gavin King 2023-06-25 10:43:03 +02:00
parent 987a0dfe3c
commit 0126d96d03
2 changed files with 51 additions and 2 deletions
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32
documentation/src/main/asciidoc/querylanguage/Expressions.adoc
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@ -1133,13 +1133,14 @@ from Book where price between 1.0 and 100.0
==== Operators for dealing with null
The following operators make it easier to deal with null values.
These predicates never evaluate to `null`.
[cols="20,20,15,~"]
|===
| Operator | Negation | Type | Semantics
| `is null` | `is not null` | Unary postfix | `true` if the value to the left is null
| `is distinct from` | `is not distinct from` | Binary | `true` if the value on the left is equal to the value on the right, or if both are null
| `is null` | `is not null` | Unary postfix | `true` if the value to the left is null, or false if it is not null
| `is distinct from` | `is not distinct from` | Binary | `true` if the value on the left is equal to the value on the right, or if both values are null, and false otherwise
|===
[[null-predicate-example]]
@ -1148,6 +1149,33 @@ The following operators make it easier to deal with null values.
from Author where nomDePlume is not null
----
[[boolean-predicate]]
==== Operators for dealing with boolean values
These operators perform comparisons on values of type `boolean`.
These predicates never evaluate to `null`.
[NOTE]
====
The values `true` and `false` of the `boolean` basic type are different to the logical `true` or `false` produced by a predicate.
====
For _logical_ operations on <<conditional-expressions,predicates>>, see <<logical-operators>> below.
[cols="20,20,15,~"]
|===
| Operator | Negation | Type | Semantics
| `is true` | `is not true` | Unary postfix | `true` if the value to the left is `true`, or `false` otherwise
| `is false` | `is not false` | Binary | `true` if the value to the left is `false`, or `false` otherwise
|===
[[null-predicate-example]]
[source, hql]
----
from Book where discontinued is not true
----
[[collection-operators]]
==== Collection predicates

21
documentation/src/main/asciidoc/userguide/chapters/query/hql/QueryLanguage.adoc
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@ -1226,6 +1226,27 @@ include::{example-dir-hql}/HQLTest.java[tags=hql-null-predicate-example]
----
====
[[boolean-predicate]]
==== Operators for dealing with boolean values
These operators perform comparisons on values of type `boolean`.
These predicates never evaluate to `null`.
[NOTE]
====
The values `true` and `false` of the `boolean` basic type are different to the logical `true` or `false` produced by a predicate.
====
For _logical_ operations on <<conditional-expressions,predicates>>, see <<logical-operators>> below.
[cols="20,20,15,~"]
|===
| Operator | Negation | Type | Semantics
| `is true` | `is not true` | Unary postfix | `true` if the value to the left is `true`, or `false` otherwise
| `is false` | `is not false` | Binary | `true` if the value to the left is `false`, or `false` otherwise
|===
[[hql-like-predicate]]
==== String pattern matching