20.16 GET_VALUE Function

This function returns the t_value.

Syntax

APEX_JSON.GET_VALUE (
    p_path             IN VARCHAR2,
    p0                 IN VARCHAR2 DEFAULT NULL,
    p1                 IN VARCHAR2 DEFAULT NULL,
    p2                 IN VARCHAR2 DEFAULT NULL,
    p3                 IN VARCHAR2 DEFAULT NULL,
    p4                 IN VARCHAR2 DEFAULT NULL,
    p_values           IN t_values DEFAULT g_values )
RETURN t_value;

Parameters

Table 20-15 GET_VALUE Function Parameters

Parameter	Description
`p_path`	Index into `p_values`.
`p[0-4]`	Each %N in `p_path` is replaced by `pN` and every i-th %s or %d is replaced by the `p[i-1]`.
`p_values`	Parsed JSON members. The default is `g_values`.

Returns/Raised Errors

Table 20-16 GET_VALUE Function Returns and Raised Errors

Return	Description
`t_value`	The `t_value` at the given path position. The record attributes are null if no data is found.
`VALUE_ERROR`	Raises this error if `p_values(p_path)` is not an array or object.

Example

This example parses a JSON string and prints attributes of values at positions.

DECLARE
    j apex_json.t_values; 
    v apex_json.t_value; 
BEGIN 
    apex_json.parse(j, '{ "foo": 3, "bar": [1, 2, 3, 4] }'); 
    v := apex_json.get_value(p_path=>'bar[%d]',p0=> 2,p_values=>j); -- returns the t_value for bar[2] 
    dbms_output.put_line(v.number_value); -- 2 
    v := apex_json.get_value(p_path=>'does.not.exist',p_values=>j); 
    dbms_output.put_line(case when v.kind is null then 'not found!' end); 
END;

Parent topic: APEX_JSON