Question

Closing connections with dbUtils

Asked by: 2djohn

I am switching all my J2EE database code over to Apache dbUtils and dbcp.  I've read through the documentation and in general it all looks nice and neat.  The one thing I don't have clear in my head is where the responsibility lies for closing connections.  It is suggested in the API that if you pass a java.sql.Connection to a method, then you are responsible for closing that connection.  Does this mean that if a Connection is not explicitly passed (i.e. the QueryRunner uses the DataSource to manage its own connection) that I do not need to do anything with the connection? That would be nice, but sounds too good to be true ;-)

BasicDataSource dataSource = DatabaseWrapper.getDataSource( application );
QueryRunnerWrapper queryRunner = new QueryRunnerWrapper( dataSource );
String sql = "SELECT * FROM members WHERE nameFirst=?";
ResultSetHandler handler = new BeanHandler( Member.class );
Member member = (Member)queryRunner.query( sql, "Joe", handler ); 
// DO I NEED TO CLOSE THE CONNECTION HERE?

                                  
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Asked On
2009-03-22 at 06:16:02ID24253317
Tags

java

,

apache

,

commons

,

dbutils

,

database

,

connection

Topics

Java Server Pages (JSP)

,

Databases Miscellaneous

,

J2EE

Participating Experts
1
Points
500
Comments
3

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    Answers

     

    by: Ajay-SinghPosted on 2009-03-22 at 18:15:02ID: 23954238

    In the code you have, you don't need to close the connection - it will
    be done by QueryRunner.run method.

    You do need to close the connection, when you pass connection object
    while running the query,

    ResultSetHandler h = ... // Define a handler the same as above example

    // No DataSource so we must handle Connections manually
    QueryRunner run = new QueryRunner();

    Connection conn = ... // open a connection
    try{
        Object[] result = (Object[]) run.query(
            conn, "SELECT * FROM Person WHERE name=?", "John Doe", h);
          // do something with the result
          
    } finally {
        // Use this helper method so we don't have to check for null
        DbUtils.close(conn);
    }

     

    by: 2djohnPosted on 2009-03-23 at 05:16:29ID: 23956785

    So from an architectural standpoint, it would probably be best to only use QueryRunner with DataSources so that connection management is handled by DBUtils?

    Thanks, John

    20120131-EE-VQP-002

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