How to query mongodb with “like” using the java api?
You must first quote your text and then use the compile to get a regex expression:
q.put("name", Pattern.compile(Pattern.quote(m)));
Without using java.util.Pattern.quote()
some characters are not escaped.
e.g. using ?
as the m
parameter will throw an exception.
You need to pass an instance of a Java RegEx (java.util.regex.Pattern):
BasicDBObject q = new BasicDBObject();
q.put("name", java.util.regex.Pattern.compile(m));
dbc.find(q);
This will be converted to a MongoDB regex when sent to the server, as well as any RegEx flags.
To make it case insensitive:
Document doc = new Document("name", Pattern.compile(keyword, Pattern.CASE_INSENSITIVE));
collection.find(doc);