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Listing 14.12 transactionManager configuration in dao.xml
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<transactionManager type="SQLMAP"> <property name="SqlMapConfigResource" value= "org/apache/ibatis/jgamestore/persistence/sqlmapdao/sql/sql -mapconfig.xml"/> </transactionManager>
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The next step involved in configuring dao.xml is mapping the interface to the implementation (see listing 14.13). This is quite easy to do it only requires that the <dao> tag provide a value to the interface attribute that corresponds with a fully qualified interface name. The implementation will then be a fully qualified class name implementation of that interface. If the configured implementation class does not utilize the specified interface, iBATIS DAO will be sure to let you know at runtime.
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Listing 14.13 DAO configuration in dao.xml
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<dao interface= "org.apache.ibatis.jgamestore.persistence.iface.ProductDao" implementation= "org.apache.ibatis.jgamestore.persistence.sqlmapdao.ProductSqlMapDao"/>
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14.7.2 Transaction demarcation
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When using the SQLMAP type with the iBATIS DAO framework, you have implicit and explicit transaction management. By default, if you do not specify a transaction explicitly, it will be started automatically for you. There are ways to avoid this; you can read about that in chapters 4 and 10. Implicit transaction management with the SQLMAP type is simple all we need to do is call the method on our data access object (see listing 14.14). The transaction management is performed automatically for us. In the case of a select, we don t need the transaction, but it doesn t hurt to have it.
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Listing 14.14 Example of implicit transaction management
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public PaginatedList getProductListByCategory( String categoryId ) {
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Writing the DAO
return productDao.getProductListByCategory(categoryId); }
Explicit transaction management (see listing 14.15) is a bit more involved. It is only needed when we are making more than one call to the data access objects. Within a try block, we would first call daoManager.startTransaction(); we would then perform our calls to one or more data access objects. When we have completed our calls to the data access layer, we would commit the transaction by calling daoManager.commitTransaction(). If the call(s) were to fail for any reason, we would have a daoManager.endTransaction() located in the finally block. This would roll back our transaction and prevent any damage to our data store. For the simple select we are performing, there is no need for this level of transaction management. However, you could do it either way if you prefer.
Listing 14.15 Example of explicit transaction management
public PaginatedList getProductListByCategory( String categoryId ) { PaginatedList retVal = null; try { // Get the next id within a separate transaction daoManager.startTransaction(); retVal = productDao .getProductListByCategory(categoryId); daoManager.commitTransaction(); } finally { daoManager.endTransaction(); } return retVal; }
Now that we have made it through the service layer in our simple view category example, let s finish this up by assembling the remaining pieces in the DAO layer.
14.8 Writing the DAO
The data access layer is where the Java code touches the database. The iBATIS SQLMap framework is used here to make handling SQL easier. A data access layer that uses iBATIS SQLMaps can be broken out into three basics pieces: the SQLMap configuration file, the associated SQLMap SQL files, and the data access objects.
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Let s see how to apply them in our view category example in order to retrieve our product list.
14.8.1 SQLMap configuration
We will use sql-map-config.xml to specify database properties, set up the transaction manager, and tie together all of the SQLmap files (see listing 14.16). The <properties> tag will point to a database.properties file that contains key/value pairs that are used to substitute the items written as ${ }. We should make sure that our database.properties file contains the appropriate driver, URL, username, and password for the chosen database.
Listing 14.16 SQLMAP transaction manager configuration
<sqlMapConfig> <properties resource="properties/database.properties"/> <transactionManager type="JDBC"> <dataSource type="SIMPLE"> <property value="${driver}" name="JDBC.Driver"/> <property value="${url}" name="JDBC.ConnectionURL"/> <property value="${username}" name="JDBC.Username"/> <property value="${password}" name="JDBC.Password"/> </dataSource> </transactionManager> <sqlMap resource= ~CCC "org/apache/ibatis/jgamestore/persistence/sqlmapdao/sql/Product.xml"/> </sqlMapConfig>
Next, we ll move on to configuring our transaction manager. For our purposes, we will use the easiest transaction manager type of JDBC. The JDBC type specifies that the SQLMap will use the standard Connection object commit and rollback methods. Since we are handling the transaction demarcation on the service layer, this configuration is more important. However, this transaction manager configuration is required in order for the transaction manager configured with iBATIS DAO to work correctly. The data source inside the transactionManager defines the JDBC data source that the transaction manager will use to retrieve connections. We specify a type of SIMPLE because we will have iBATIS handling the data source connection pool. The <property> tag is then used to specify the driver, connection URL, username, and password. Each <property> tag uses the ${ } notation and retrieves values from the database.properties file.
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