check_validity

If cnc is not null, then checks that all the database objects referenced in the statement actually exist in the connection's database (for example the table being updated in a UPDATE statement must exist in the connection's database for the check to succeed).

This method fills the this->validity_meta_struct attribute.

If cnc is null, then remove any information from a previous call to this method stored in this. In this case, the this->validity_meta_struct attribute is cleared.

Also note that some parts of this may be modified: for example leading and trailing spaces in aliases or objects names will be removed.

Parameters:

this	a SqlStatement pointer
cnc	a Connection object, or null

Returns:

TRUE if no error occurred