private String presub(String query, Object[] params) {
if (params == null) return query;
StringBuffer buf = new StringBuffer();
Matcher matcher = PRE_SUB_PATTERN.matcher(query);
while (matcher.find()) {
matcher.appendReplacement(
buf,
((String) params[Integer.parseInt(matcher.group(1)) - 1])
.replace("\\", "\\\\")
.replace("$", "\\$"));
}
matcher.appendTail(buf);
return buf.toString();
}
