Orientdb upsert using java

Question

i have a document in orient db like

{"a":"1","b":"2","c":"3"}

how can i update the value of b if c is 3 using java

i need to execute the below query using java

UPDATE <document name >Merge {"a":25"} where c=3

please help me

Answer 1

ODatabaseDocumentTx db = new ODatabaseDocumentTx(path);
db.open("root","root");
db.command(new OCommandSQL("update <document name > set a=30 where c=3")).execute();