Allows to executing the given SQL instruction and report if such instruction have returned some content.
This function is useful when you execute commands that tries to figure out if some database row exist.
As an example you might be interested on checking if some item exist on the database so, you could do:
NOTE 1: that previous sentence doesn't check the meaning of the SQL statement, as a consenquence you must ensure that the given SQL statement provides a result if the element is found or an empty data result if the element be looked up doesn't exist.
NOTE 2: this function deallocates results get from the execution of the test.
|cmd_string ||The SQL statement to check for emptyness|
- TRUE if the SQL have some content, FALSE if not.