linerem.blogg.se

1. #ORG APACHE TOMCAT DBCP DBCP BASICDATASOURCE DRIVERS#
2. #ORG APACHE TOMCAT DBCP DBCP BASICDATASOURCE DRIVER#

We are accessing mainframe data using a JDBC driver, but it is not truly a database. When upgrading from DBCP 1.0 to DBCP 1.1 you can encounter the following issue (reported on commons-user): Q: What is the best way, ASIDE from running a query against the DB, to be sure that the connection is still valid when it is retrieved from the pool?Ī: How would you do this without a pool? I.e., what is the best way aside from running a query to be sure that a connection is still valid when returned from DriverManager DataSource.getConnection? Q: Is this project still active or have they just not released anything in an excessive period of time?Ī: DBCP is still active. Hibernate lets you develop persistent classes following common Java idiom - including association, inheritance, polymorphism, composition and the Java collections framework. Hibernate is a powerful, ultra-high performance object/relational persistence and query service for Java. The location of that interface inside the JNDI namespace is given by 'dataSourceName': 'java:com/env/jdbc/mydatabase'.įinally, beware bug 33357 in 5.5.7 which should be fixed soon though :-P Hibernate The Realm implementation is '.DataSourceRealm' it will use a '' interface found in the JNDI initial context. I have put the 'Realm' element inside the 'Host' element, but as said above you can put it into the 'Context' element, too. Now define the Tomcat Authentication Realm. Tomcat 5.5 'server' element configuration.If you want to put it in the 'Context' element, the 'Realm' must be in the same 'Context' element and must additionally have the attribute 'localDataSource' set to 'true'. I have put the 'Resource' element into the 'GlobalNamingResource' element instead of the 'Context' element.

#ORG APACHE TOMCAT DBCP DBCP BASICDATASOURCE DRIVER#

In particular: what driver shall be used by the factory to actually get database connections: ''.Īdditionally (and one level down, if you will) the 'Driver' named in '!driverClassName' is itself configured through the URL used when a new connection is created The allowed attributes can be found by looking for JavaBean-compliant set() methods and members in the source or the DBCP API doc. And for this type of pool we can demand that objects be verified at borrowing time - which is what we want as it will prevent Tomcat getting its paws on stale database connections.ģ: Configuring the attributes of the 'BasicDataSourceFactory'. These use a resource pool of type '.impl.GenericObjectPool'. 'o.a.c.d.BasicDataSourceFactory' creates '.BasicDataSource' instances. By setting 'factory', you can override that default value. This is actually not necessary if you want '.BasicDataSourceFactory' as that is the default factory used by Tomcat whenever '' objects should be created. This configuration can be tricky to get right, so here is a complete example:įirst, define the '' available to web applications in the JNDI default context under 'jdbc/m3p_5_0' by:ġ: Saying what class or interface a JNDI context lookup will return: ''.Ģ: Saying what class will actually create instances of the above, i.e. The database shall be accessed through connections from a DBCP pool. Less DBCP, more Tomcat (and Tomcat 5.5.7 in particular):Ī more specialized example, in which we want to set up a Tomcat Authentication Realm based on a database. If you're running tomcat with the Security Manager, you will need to add to your catalina.policy:į.cpdsadapter.DriverAdapterCPDSį.datasources.PerUserPoolDataSourceFactoryĭataSourceNamejava:comp/env/jdbc/TestDBCPDS Apart from JDBC connections, this provides support for pooling Statement and PreparedStatement instances as well. The Database Connection Pool (DBCP) component can be used in applications where JDBC resources need to be pooled. Please send any corrections (for now) to Apache_DBCP_Structure.pdf

#ORG APACHE TOMCAT DBCP DBCP BASICDATASOURCE DRIVERS#

Here's a little diagram showing what datastructure DBCP sets up and how that datastructure is used in case the DriverManager is employed to obtain Drivers at runtime. If you don't find the information you need you can always contact us using one of the mailing lists.

Commons-DBCP provides database connection pooling services.Ī lot of information is available on the DBCP website.