MyBatisの設定をプログラム上から行う実装例。Spring-Bootのuber-jarの場合は明示的にPathMatchingResourcePatternResolverでmapping.xmlを探索してマッピングする必要がある。

mybatis_exmple.java

	private SqlSessionFactory createFactory() {
		DataSource dataSource = getDataSource();
		TransactionFactory transactionFactory = new JdbcTransactionFactory();
		Environment environment = new Environment("production", transactionFactory, dataSource);

		Configuration configuration = new Configuration(environment);

		// configuration.addMappers("jp.seraphyware.example.dao.mapper");
		// ↑ Spring-BootのUber-jarの場合では、この方法ではスキャンできない

		try {
			// uber-jar上でマッピングxmlをスキャンして明示的に設定を行う
			Resource[] resources = new PathMatchingResourcePatternResolver()
					.getResources("classpath:jp/seraphyware/example/dao/mapper/*.xml");
			for (Resource resource : resources) {
				logger.info("--> parse mapping-xml: {}", resource);
				XMLMapperBuilder xmlMapperBuilder = new XMLMapperBuilder(resource.getInputStream(),
						configuration, resource.toString(), configuration.getSqlFragments());
				xmlMapperBuilder.parse();
			}

		} catch (Exception ex) {
			throw new RuntimeException(ex);
		}

		return new SqlSessionFactoryBuilder().build(configuration);
	}

pom.xml

		<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis</artifactId>
			<version>3.5.1</version>
		</dependency>