Create an insert with dynamic number or columns in Oracle - json

Question

Based on a given JSON, I need to create an insert statement in a stored procedure. For example I have this JSON:
{
"tableName": "test_table",
"columName":["col_1","col_2","col3"],
"columnValue":["test1","test2","test3"]
}
The "columName" is an array with dynamic number of values and the "columnValue" is an array with the values for each position of the "columnName" array.
What I need to do is to create an insert statement dynamically. For example, for the given JSON, the insert statement looks like this:
INSERT INTO test_table("col_1", "col_2", "col_3") VALUES("test1", "test2", "test3")
The test_table table has 27 columns. In JSON I receive data for one, two, three or all columns. How can I build the select statement based on dynamic number of columns.
I am using APEX_JSON.
Thank you!

Answer 1

SET SERVEROUTPUT ON SIZE 999999
CLEAR SCREEN
DECLARE
l_json_text VARCHAR2(32767);
l_json_values apex_json.t_values;
l_statement VARCHAR2(32767);
FUNCTION add_quotes (string_i VARCHAR2) RETURN VARCHAR2
IS
BEGIN
RETURN '"' ||string_i||'"';
END;
BEGIN
l_json_text := '{
"tableName": "test_table",
"columName":["col_1","col_2","col3"],
"columnValue":["test1","test2","test3"]
}
';
apex_json.parse(
p_values => l_json_values,
p_source => l_json_text
);
l_statement := 'INSERT INTO ';
l_statement := l_statement || apex_json.get_varchar2(p_path => 'tableName', p_values => l_json_values);
l_statement := l_statement || '(';
FOR j IN 1..apex_json.get_count(p_path => 'columName', p0 => 1, p_values => l_json_values) LOOP
l_statement := l_statement || add_quotes(apex_json.get_varchar2(p_path => 'columName[%d]', p0 => j, p_values => l_json_values));
l_statement := l_statement || ',';
END LOOP;
l_statement := RTRIM(l_statement,',');
l_statement := l_statement || ') values (';
FOR j IN 1..apex_json.get_count(p_path => 'columnValue', p0 => 1, p_values => l_json_values) LOOP
l_statement := l_statement || add_quotes(apex_json.get_varchar2(p_path => 'columnValue[%d]', p0 => j, p_values => l_json_values));
l_statement := l_statement || ',';
END LOOP;
l_statement := RTRIM(l_statement,',');
l_statement := l_statement || ')';
dbms_output.put_line(l_statement);
END;
/
INSERT INTO test_table("col_1","col_2","col3") values ("test1","test2","test3")
PL/SQL procedure successfully completed.

Answer 2

declare
v_count number;
v_tableName varchar2(100 char);
v_columnName varchar2(100 char);
v_columnValue varchar2(100 char);
v_sqlStatement varchar2(2000 char);
v_json clob:= '{"tableName": "test_table","columnName":["col_1","col_2","col3"],"columnValue":["test1","test2","test3"]}';
begin
apex_json.parse(v_json);
v_count := apex_json.get_count(p_path=>'columnName');
v_tableName := apex_json.get_varchar2(p_path => 'tableName');
FOR i IN 1..v_count loop
v_columnName := apex_json.get_varchar2(p_path => 'columnName[%d]',p0 => i);
v_columnValue := apex_json.get_varchar2(p_path => 'columnValue[%d]',p0 => i);
v_sqlStatement := 'insert into' || v_tableName || '("' || v_columnName' || '" values("' || v_columnValue || '");' ;
execute immediate v_sqlStatement;
end loop;
end;