rewrite_for_default_values
Description:
public SqlStatement? rewrite_for_default_values (Set @params, bool remove) throws Error
Rewrites this and creates a new SqlStatement
where all the variables which are to a DEFAULT value (as returned by
value_is_default) are either removed from the statement (if remove is true) or replaced by
the "DEFAULT" keyword (if remove is false).
This function is only useful for database providers' implementations which have to deal with default values when executing statements, and is
only relevant in the case of INSERT or UPDATE statements (in the latter case an error is returned if remove is
true).
For example the <programlisting><![CDATA[INSERT INTO mytable (id, name) VALUES (23, #name::string)]]><
/programlisting> is re-written into <programlisting><![CDATA[INSERT INTO mytable (id, name) VALUES (23, DEFAULT)]]><
/programlisting> if remove is false and into <programlisting><![CDATA[INSERT INTO
mytable (id) VALUES (23)]]></programlisting> if remove is true.
Parameters:
| this |
a Statement object |
| remove |
set to true if DEFAULT fields are removed, of false if the "DEFAULT" keyword is used |
| params |
a Set containing the variable's values to be bound when executing this |
Returns:
|
a new SqlStatement, or null if an error occurred |