29.22 GET_VARCHAR2 Function

This function returns a varchar2 member value. This function converts boolean and number values to varchar2 values.

Syntax

APEX_JSON.GET_VARCHAR2 (
    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_default          IN BOOLEAN  DEFAULT NULL,
    p_values           IN t_values DEFAULT g_values )
RETURN VARCHAR2;

Parameters

Table 29-29 GET_VARCHAR2 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_default	The default value if the member does not exist.
p_values	Parsed JSON members. The default is g_values.

Returns and Raised Errors

Table 29-30 GET_VARCHAR2 Function Returns and Raised Errors

Return	Description
VARCHAR2	This is the value at the given path position.
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 the value at a position.

DECLARE
    j apex_json.t_values;
BEGIN
    apex_json.parse(j, '{ "items": [ 1, 2, { "foo": 42 } ] }');
    dbms_output.put_line(apex_json.get_varchar2(p_path=>'items[%d].foo',p0=> 3,p_values=>j));
END;