How to query mongodb with “like” using the java api?

Question

this question is very similar to another post

I basically want to use the mongodb version of the sql "like" '%m%' operator

but in my situation i'm using the java api for mongodb, while the other post is using mongodb shell

i tried what was posted in the other thread and it worked fine

db.users.find({"name": /m/}) 

but in java, i'm using the put method on the BasicDBObject and passing it into the find() method on a DBCollections object

BasicDBObject q = new BasicDBOBject(); q.put("name", "/"+m+"/"); dbc.find(q); 

but this doesn't seem to be working.

anyone has any ideas?

Answer 1

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.

Answer 2

To make it case insensitive:

Document doc = new Document("name", Pattern.compile(keyword, Pattern.CASE_INSENSITIVE)); collection.find(doc);