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Add $Null() as value alternative #1361

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merged 3 commits into from
Dec 3, 2024
Merged

Add $Null() as value alternative #1361

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d52278a
Add `$Null()` as value alternative
hjboth Oct 21, 2024
1c2a091
Merge branch 'main' into null_anno_xpr_val
bugwelle Dec 2, 2024
577e087
Update advanced/odata.md
bugwelle Dec 2, 2024
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17 changes: 10 additions & 7 deletions advanced/odata.md
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Expand Up @@ -336,14 +336,16 @@ Primitive annotation values, meaning Strings, Numbers, `true`, and `false` are m
<Annotation Term="Some.String" String="foo"/>
```

Rendering a `null` value must be done as dynamic expression or as an [annotation expression](#expression-annotations):
#### Null Value { #null-value }

A `null` value can be set either as an [annotation expression](#expression-annotations) or as a [dynamic expression](#dynamic-expressions):

```cds
@Some.Null: { $edmJson: { $Null } }
// or
@Some.Null: (null)
@Some.NullXpr: (null) // annotation expression, short form
@Some.NullFunc: ($Null()) // annotation expression, functional form
@Some.NullDyn: { $edmJson: { $Null } } // dynamic expression
```
Both result in the following:
All three expressions result in the following rendering:
```xml
<Annotation Term="Some.Null">
<Null/>
Expand Down Expand Up @@ -662,7 +664,8 @@ The following operators and clauses of CDL are supported:
* Logical: `and`, `or`, `not`
* Relational: `=`, `<>`, `!=`, `<`, `<=`, `>`, `>=`, `in`, `between ... and ...`
* Unary `+` and `-`
* Arithmetic: `+`, `-`, `*`, `/`, `||`
* Arithmetic: `+`, `-`, `*`, `/`
* Concat: `||`
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@hjboth hjboth Oct 21, 2024 •
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to be exact, || is not an arithmetic operator...

* `cast(...)`

Example:
Expand Down Expand Up @@ -718,7 +721,7 @@ service S {

In addition, the following functions are supported:

* `$Null()` representing the `null` value
* `$Null()` representing the `null` value [`Null`]([annotation expression](#null-value)).
* `Div(...)` (or `$Div(...)`) and `Mod(...)` (or `$Mod(...)`) for integer division and modulo
* [`Has(...)`](https://docs.oasis-open.org/odata/odata/v4.02/csd01/part2-url-conventions/odata-v4.02-csd01-part2-url-conventions.html#Has) (or `$Has(...)`)
* the functions listed in sections
Expand Down