ExternalDaoTransactionManager in Java

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ExternalDaoTransactionManager
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HibernateDaoTransactionManager JdbcDaoTransactionManager * DataSource * JDBC.Driver * JDBC.ConnectionURL * JDBC.Username * JDBC.Password * JDBC.DefaultAutoCommit
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JtaDaoTransactionManager * DBJndiContext * UserTransaction
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OjbBrokerTransactionManager SqlMapDaoTransactionManager ToplinkDaoTransactionManager
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Configuring the DAO
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OK, so now that you know what your options are, let s take a closer look to see
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what makes each one unique. The EXTERNAL transaction manager The EXTERNAL transaction manager is the simplest to configure (it has no properties, and any that are passed to it are ignored), but potentially the most difficult to use, because you are 100 percent responsible for all transaction management in your application. The HIBERNATE transaction manager The HIBERNATE transaction manager is also very simple to configure. It takes all of the properties that are passed to it, and simply passes them on to the Hibernate session factory. In addition, any properties that are passed in with names that begin with class. are assumed to be classes to be managed by Hibernate, and are added to the configuration object that is used to build the session factory. Likewise, any properties passed in that begin with map. are assumed to be mapping files, and are also added to the configuration object. The JDBC transaction manager The JDBC transaction manager is probably the most difficult one to configure. The DataSource property is required for this transaction manager and must be one of the following: SIMPLE, DBCP, or JNDI. The SIMPLE data source The SIMPLE data source is an implementation of the iBATIS SimpleDataSource, which is a stand-alone implementation ideal for minimal overhead and dependencies. It has five required properties:
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JDBC.Driver This is the fully qualified name of the JDBC driver to be used for managing transactions in this DAO context. JDBC.ConnectionURL This is the JDBC URL that is to be used to connect to the database for this DAO context. JDBC.Username This is the username that is to be used to connect to the database for this DAO context. JDBC.Password This is the password of the user to be used to connect to the database for this DAO context. JDBC.DefaultAutoCommit If true (or any expression that the Boolean class in Java interprets as true), then the autoCommit property of connections returned by this data source will be set to true in this DAO context.
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iBATIS data access objects
In addition to those required properties, eight optional properties can be used to configure the connection pool:
Pool.MaximumActiveConnections This is the number of connections that
the pool can have active at one time. The default value of this property is 10 connections.
Pool.MaximumIdleConnections This specifies the number of connections
that the pool can have idle at one time. The default value of this property is 5 connections.
Pool.MaximumCheckoutTime This is the maximum number of milliseconds
that a connection is reserved before it can be given to another request. The default value of this property is 20,000 milliseconds, or 20 seconds.
Pool.TimeToWait This represents the number of milliseconds to wait for a
connection if one is not available when requested. The default value of this property is 20,000 milliseconds, or 20 seconds.
Pool.PingEnabled If true (or any expression that the Boolean class in Java
interprets as true), then connections will be tested using the query defined in the Pool.PingQuery property when they are determined to be at risk for invalidation. The default value for this property is false, meaning that connections will never be pinged before use. The next three properties are used to determine the behavior of connection pinging.
Pool.PingQuery This is the query to be executed if a connection needs to be tested to see if it is still valid. Be sure to make this a statement that will return very quickly. For example, on Oracle, something like select 0 from dual would work very well. Pool.PingConnectionsOlderThan This represents the age (in millisec-
onds) at which connections are considered to be at risk for invalidation. The default value for this property is 0, which means that if pinging is enabled, then every time a connection is used it will be checked. In a hightransaction environment, this could have a serious impact on performance.
Pool.PingConnectionsNotUsedFor This is the number of milliseconds to
let a connection sit idle before considering it at risk for invalidation. The DBCP data source The DBCP data source is a wrapper around the Jakarta Commons Database Connection Pooling (DBCP) project s data source implementation, and is intended to allow you to use a more robust implementation at the expense of an added
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