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这篇文章主要介绍了spring boot DAO之Mybatis的示例分析,具有一定借鉴价值,感兴趣的朋友可以参考下,希望大家阅读完这篇文章之后大有收获,下面让小编带着大家一起了解一下。
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依赖
org.springframework.boot spring-boot-starter-data-jpa MySQL mysql-connector-java org.mybatis.spring.boot mybatis-spring-boot-starter 1.3.2
application-database.properties
#初始化数据库的时候,如果错误,是否继续启动。 spring.datasource.continue-on-error=false #jdbc driver.默认通过uri来自动检测。 spring.datasource.driver-class-name=com.mysql.jdbc.Driver #jdbc url.连接数据库的uri spring.datasource.url=jdbc:mysql://172.28.1.227:3310/fc?useUnicode=true&autoReconnect=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useServerPrepStmts=false #数据库连接用户名 spring.datasource.username=fcdev #数据连接密码 spring.datasource.password=123456 #全限定名,连接池。默认自动检测classpath spring.datasource.type=com.zaxxer.hikari.HikariDataSource #sql脚本字符 spring.datasource.sql-script-encoding=UTF-8 #mybatis配置 mybatis.check-config-location=false mybatis.configuration.default-fetch-size=1000 mybatis.configuration.map-underscore-to-camel-case=true #mybatis.mapper-locations=
源码-MybatisProperties
@ConfigurationProperties(prefix = MybatisProperties.MYBATIS_PREFIX) public class MybatisProperties { public static final String MYBATIS_PREFIX = "mybatis"; /** * Location of MyBatis xml config file. */ private String configLocation; /** * Locations of MyBatis mapper files. */ private String[] mapperLocations; /** * Packages to search type aliases. (Package delimiters are ",; \t\n") */ private String typeAliasesPackage; /** * Packages to search for type handlers. (Package delimiters are ",; \t\n") */ private String typeHandlersPackage; /** * Indicates whether perform presence check of the MyBatis xml config file. */ private boolean checkConfigLocation = false; /** * Execution mode for {@link org.mybatis.spring.SqlSessionTemplate}. */ private ExecutorType executorType; /** * Externalized properties for MyBatis configuration. */ private Properties configurationProperties; /** * A Configuration object for customize default settings. If {@link #configLocation} * is specified, this property is not used. */ @NestedConfigurationProperty private Configuration configuration; }
源码-MybatisAutoConfiguration
@org.springframework.context.annotation.Configuration @ConditionalOnClass({ SqlSessionFactory.class, SqlSessionFactoryBean.class }) @ConditionalOnBean(DataSource.class) @EnableConfigurationProperties(MybatisProperties.class) @AutoConfigureAfter(DataSourceAutoConfiguration.class) public class MybatisAutoConfiguration { private static final Logger logger = LoggerFactory.getLogger(MybatisAutoConfiguration.class); private final MybatisProperties properties; private final Interceptor[] interceptors; private final ResourceLoader resourceLoader; private final DatabaseIdProvider databaseIdProvider; private final ListconfigurationCustomizers; public MybatisAutoConfiguration(MybatisProperties properties, ObjectProvider interceptorsProvider, ResourceLoader resourceLoader, ObjectProvider databaseIdProvider, ObjectProvider > configurationCustomizersProvider) { this.properties = properties; this.interceptors = interceptorsProvider.getIfAvailable(); this.resourceLoader = resourceLoader; this.databaseIdProvider = databaseIdProvider.getIfAvailable(); this.configurationCustomizers = configurationCustomizersProvider.getIfAvailable(); } @PostConstruct public void checkConfigFileExists() { if (this.properties.isCheckConfigLocation() && StringUtils.hasText(this.properties.getConfigLocation())) { Resource resource = this.resourceLoader.getResource(this.properties.getConfigLocation()); Assert.state(resource.exists(), "Cannot find config location: " + resource + " (please add config file or check your Mybatis configuration)"); } } @Bean @ConditionalOnMissingBean public SqlSessionFactory sqlSessionFactory(DataSource dataSource) throws Exception { SqlSessionFactoryBean factory = new SqlSessionFactoryBean(); factory.setDataSource(dataSource); factory.setVfs(SpringBootVFS.class); if (StringUtils.hasText(this.properties.getConfigLocation())) { factory.setConfigLocation(this.resourceLoader.getResource(this.properties.getConfigLocation())); } Configuration configuration = this.properties.getConfiguration(); if (configuration == null && !StringUtils.hasText(this.properties.getConfigLocation())) { configuration = new Configuration(); } if (configuration != null && !CollectionUtils.isEmpty(this.configurationCustomizers)) { for (ConfigurationCustomizer customizer : this.configurationCustomizers) { customizer.customize(configuration); } } factory.setConfiguration(configuration); if (this.properties.getConfigurationProperties() != null) { factory.setConfigurationProperties(this.properties.getConfigurationProperties()); } if (!ObjectUtils.isEmpty(this.interceptors)) { factory.setPlugins(this.interceptors); } if (this.databaseIdProvider != null) { factory.setDatabaseIdProvider(this.databaseIdProvider); } if (StringUtils.hasLength(this.properties.getTypeAliasesPackage())) { factory.setTypeAliasesPackage(this.properties.getTypeAliasesPackage()); } if (StringUtils.hasLength(this.properties.getTypeHandlersPackage())) { factory.setTypeHandlersPackage(this.properties.getTypeHandlersPackage()); } if (!ObjectUtils.isEmpty(this.properties.resolveMapperLocations())) { factory.setMapperLocations(this.properties.resolveMapperLocations()); } return factory.getObject(); } @Bean @ConditionalOnMissingBean public SqlSessionTemplate sqlSessionTemplate(SqlSessionFactory sqlSessionFactory) { ExecutorType executorType = this.properties.getExecutorType(); if (executorType != null) { return new SqlSessionTemplate(sqlSessionFactory, executorType); } else { return new SqlSessionTemplate(sqlSessionFactory); } } /** * This will just scan the same base package as Spring Boot does. If you want * more power, you can explicitly use * {@link org.mybatis.spring.annotation.MapperScan} but this will get typed * mappers working correctly, out-of-the-box, similar to using Spring Data JPA * repositories. */ public static class AutoConfiguredMapperScannerRegistrar implements BeanFactoryAware, ImportBeanDefinitionRegistrar, ResourceLoaderAware { private BeanFactory beanFactory; private ResourceLoader resourceLoader; @Override public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) { logger.debug("Searching for mappers annotated with @Mapper"); ClassPathMapperScanner scanner = new ClassPathMapperScanner(registry); try { if (this.resourceLoader != null) { scanner.setResourceLoader(this.resourceLoader); } List
packages = AutoConfigurationPackages.get(this.beanFactory); if (logger.isDebugEnabled()) { for (String pkg : packages) { logger.debug("Using auto-configuration base package '{}'", pkg); } } scanner.setAnnotationClass(Mapper.class); scanner.registerFilters(); scanner.doScan(StringUtils.toStringArray(packages)); } catch (IllegalStateException ex) { logger.debug("Could not determine auto-configuration package, automatic mapper scanning disabled.", ex); } } @Override public void setBeanFactory(BeanFactory beanFactory) throws BeansException { this.beanFactory = beanFactory; } @Override public void setResourceLoader(ResourceLoader resourceLoader) { this.resourceLoader = resourceLoader; } } /** * {@link org.mybatis.spring.annotation.MapperScan} ultimately ends up * creating instances of {@link MapperFactoryBean}. If * {@link org.mybatis.spring.annotation.MapperScan} is used then this * auto-configuration is not needed. If it is _not_ used, however, then this * will bring in a bean registrar and automatically register components based * on the same component-scanning path as Spring Boot itself. */ @org.springframework.context.annotation.Configuration @Import({ AutoConfiguredMapperScannerRegistrar.class }) @ConditionalOnMissingBean(MapperFactoryBean.class) public static class MapperScannerRegistrarNotFoundConfiguration { @PostConstruct public void afterPropertiesSet() { logger.debug("No {} found.", MapperFactoryBean.class.getName()); } } }
TestMybatisDao
@Repository @Mapper public interface TestMybatisDao { @Select("select id, name from t_sys_menu where id = #{id}") SysMenu getById(@Param("id") int id); }
springboot启动类
@MapperScan(basePackages="com.example.spring.dao") @SpringBootApplication public class DataDemoApplication { public static void main(String[] args) { SpringApplication.run(DataDemoApplication.class, args); } }
AppContextTest
@RunWith(SpringRunner.class) @SpringBootTest public class AppContextTest { @Autowired private TestMybatisDao testMybatisDao; @Test public void mybatisTest(){ SysMenu sysMenu = testMybatisDao.getById(1); System.out.println("menuName = " + sysMenu.getName()); } }
注:mybatis-spring-boot-starter既可以使用xml配置也可以使用注解。
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