iBATIS 3 - User Guide
3 May 2010 11
environment
transactionManager
dataSource
o mappers
properties
These are externalizable, substitutable properties that can be configured in a typical Java Properties file
instance, or passed in through sub-elements of the properties element. For example:
<properties resource="org/apache/ibatis/example/config.properties">
<property name="username" value="dev_user"/>
<property name="password" value="F2Fa3!33TYyg"/>
</properties>
The properties can then be used throughout the configuration files to substitute values that need to be
dynamically configured. For example:
<dataSource type="POOLED">
<property name="driver" value="${driver}"/>
<property name="url" value="${url}"/>
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
</dataSource>
The username and password in this example will be replaced by the values set in the properties
elements. The driver and url properties would be replaced with values contained from the
config.properties file. This provides a lot of options for configuration.
Properties can also be passed into the SqlSessionBuilder.build() methods. For example:
SqlSessionFactory factory =
sqlSessionFactoryBuilder.build(reader, props);
// ... or ...
SqlSessionFactory factory =
sqlSessionFactoryBuilder.build(reader, environment, props);
If a property exists in more than one of these places, iBATIS loads them in the following order:
Properties specified in the body of the properties element are read first,
Properties loaded from the classpath resource or url attributes of the properties element are
read second, and override any duplicate properties already specified ,
Properties passed as a method parameter are read last, and override any duplicate properties
that may have been loaded from the properties body and the resource/url attributes.
Thus, the highest priority properties are those passed in as a method parameter, followed by
resource/url attributes and finally the properties specified in the body of the properties element.
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