StringBuilder sql = new StringBuilder();
sql.append("-- dropping constraint ");
sql.append(r.getName());
sql.append(" --\r\n");
sql.append("ALTER TABLE ");
sourceTable.addSQL(sql, DBExpr.CTX_FULLNAME);
sql.append(" DROP CONSTRAINT ");
appendElementName(sql, r.getName());
// done
return script.addStmt(sql.toString());
}