* if the change fails
*/
@SuppressWarnings("unchecked")
public void setAllowsNull(boolean allowsNull) throws SQLException {
EOSchemaSynchronization schemaSynchronization = _table.database().synchronizationFactory();
NSArray<EOSQLExpression> expressions = schemaSynchronization.statementsToModifyColumnNullRule(name(), _table.name(), allowsNull, NSDictionary.EmptyDictionary);
ERXMigrationDatabase._ensureNotEmpty(expressions, "modify allows null", true);
ERXJDBCUtilities.executeUpdateScript(_table.database().adaptorChannel(), ERXMigrationDatabase._stringsForExpressions(expressions));
}
/**