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‎src/current/v25.2/jsonpath.md

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@@ -18,7 +18,7 @@ A JSONPath expression has the following generic structure:
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- `mode` is an optional mode (`lax` or `strict`) that determines how structural mismatches are tolerated. If not specified, the mode is `lax`. Refer to [Structural error handling](#structural-error-handling).
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- `$` is the root of the JSONPath, and must be the first element in a JSONPath expression. For an example, refer to [Access entire document](#access-entire-document).
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- `.key` is an optional key accessor that refers to a named field in a `JSONB` object. To access array elements, use `.key[index]` or `.key[*]`. Each successive key accessor navigates one level deeper into the structure. `.*` matches all fields in the current object.
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- `? (filter_exp)` is an optional filter expression that evaluates the path according to a [predicate check expression](#check-expression), only returning the results that match. For syntax details, refer to [Filter expressions](#filter-expressions).
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- `? (filter_exp)` is an optional filter expression that evaluates the path according to a [predicate check expression](#check-expressions), only returning the results that match. For syntax details, refer to [Filter expressions](#filter-expressions).
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- `method` is an optional [JSONPath method](#jsonpath-methods) that can be used to access or transform the current path value.
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The path is evaluated left to right, and each stage refines or filters the result.
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Use JSONPath functions to extract or evaluate target `JSONB` data according to a specified [path](#jsonpath-expression). For full details on JSONPath functions, refer to [Functions and Operators]({% link {{ page.version.version }}/functions-and-operators.md %}# jsonpath-functions).
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| Function | Description | If no match |
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|-------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------|
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| `jsonb_path_exists(jsonb, jsonpath)` | Returns true if any match is found. | `false` |
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| `jsonb_path_match(jsonb, jsonpath)` | Returns true if the path expression evaluates to true. Only useful with [predicate check expressions](#predicate-check-expressions), as it expects a single Boolean value. | `false` |
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| `jsonb_path_query(jsonb, jsonpath)` | Returns all matches as a set of `JSONB` values. | `NULL` |
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| `jsonb_path_query_array(jsonb, jsonpath)` | Returns all matches as a single `JSONB` array. | `[]` |
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| `jsonb_path_query_first(jsonb, jsonpath)` | Returns the first match only. | `NULL` |
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| Function | Description | If no match |
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|-------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------|
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| `jsonb_path_exists(jsonb, jsonpath)` | Returns true if any match is found. | `false` |
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| `jsonb_path_match(jsonb, jsonpath)` | Returns true if the path expression evaluates to true. Only useful with [predicate check expressions](#check-expressions), as it expects a single Boolean value. | `false` |
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| `jsonb_path_query(jsonb, jsonpath)` | Returns all matches as a set of `JSONB` values. | `NULL` |
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| `jsonb_path_query_array(jsonb, jsonpath)` | Returns all matches as a single `JSONB` array. | `[]` |
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| `jsonb_path_query_first(jsonb, jsonpath)` | Returns the first match only. | `NULL` |
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Each function accepts two required and two optional arguments as follows:
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"2023-24"
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~~~
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To access nested keys, append key accessors to their parent keys. The following query returns the `stats` value for each element in the `players` array, using the [array accessor](#access-array-elements):
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To access nested keys, append key accessors to their parent keys. The following query returns the `stats` value for each element in the `players` array, using the [array accessor](#access-jsonb-array-elements):
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{% include_cached copy-clipboard.html %}
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~~~ sql
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## Variables in JSONPath expressions
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Define a variable in a JSONPath expression by prefixing it with `$`. Then specify a value as an argument in the [JSONPath function](#jsonpath-function).
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Define a variable in a JSONPath expression by prefixing it with `$`. Then specify a value as an argument in the [JSONPath function](#jsonpath-functions).
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The following query filters players whose `ppg` is greater than the value of the `min` variable:
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SQLSTATE: 2203A
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~~~
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However, setting `silent` to `true` in a [JSONPath function](#jsonpath-function) suppresses any errors:
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However, setting `silent` to `true` in a [JSONPath function](#jsonpath-functions) suppresses any errors:
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{% include_cached copy-clipboard.html %}
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~~~ sql

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