How to execute the CONNECT command in sql

Hi ,
I am using DB2 database and I need to execute the sql statement
CONNECT TO Database user username USING password.
Can anyone tell me how to execute this query in java.
I tried this by using executeQuery but it was giving a sexception somtehing as follows
COM.ibm.db2.jdbc.DB2Exception: [IBM][JDBC Driver] CLI0637E QUERY cannot be found.
     at COM.ibm.db2.jdbc.app.SQLExceptionGenerator.throwInvalidQueryError(SQLExceptionGenerator.java:577)
     at COM.ibm.db2.jdbc.app.DB2Statement.executeQuery(DB2Statement.java:597)
     at First.detail(First.java:18)
     at First.main(First.java:29)
can anyone of you help me out in solving this problem

You need a connection to use JDBC stuff. When you have a connection, you are already logged in. There is no need for a query to connect.

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