void setNewAutoIncrementValue(Expression obj) throws Exception {
if (identity) {
counter.setNextValue(obj);
}
}
/**
* Return the default expression for this column. If there is no default vale then it return
* Expression.NULL.
*
* @param con SSConnection for transactions
*/
Expression getDefaultValue(SSConnection con) throws SQLException {
if (identity) counter.createNextValue(con);
return defaultValue;
}