1.dao層結構圖

2.配置文件配置數據源

#dao層mybatis配置 spring.datasource.url=jdbc:mysql://localhost:3306/demo?autoReconnect=true&useUnicode=true&characterEncoding=UTF-8&useAffectedRows=true spring.datasource.username=root spring.datasource.password=123456

3.Java API讀取數據庫配置

(1)使用@ConfigurationProperties注解

ConfigurationProperties(prefix = "spring.datasource")：為當前注入的bean對象讀取配置文件以spring.datasource開頭的配置項，如果之后的部分和實體類的屬性一致的話，會將配置的內容注入給對象的屬性中

@Data @AllArgsConstructor @NoArgsConstructor @ConfigurationProperties(prefix = "spring.datasource") public class JDBCProperties {private String url;private String username;private String password;private String driver; }

（2）Mybatis映射mapper、xml文件配置

/*** 1.注入配置文件* 2.加載jdbc文件配置* 3.開啟事務* 4.掃描java mapper文件地址*/ @Configuration @EnableConfigurationProperties(com.vivo.internet.demo.dao.config.JDBCProperties.class) @EnableTransactionManagement @MapperScan("com.vivo.internet.demo.dao.mapper") public class MybatisConfig {@Autowiredprivate JDBCProperties properties;/*** 設置數據源和相應的連接屬性* @return*/@Beanpublic DataSource dataSource() {DruidDataSource dataSource = new DruidDataSource();dataSource.setUrl(properties.getUrl());dataSource.setUsername(properties.getUsername());dataSource.setPassword(properties.getPassword());dataSource.setDriverClassName(properties.getDriver());return dataSource;}/*** 創建sql連接，映射mapper.xml文件地址，加載mybatis配置* @param dataSource* @return* @throws IOException*/@Beanpublic SqlSessionFactoryBean sqlSessionFactory(DataSource dataSource) throws IOException {SqlSessionFactoryBean sqlSessionFactory = new SqlSessionFactoryBean();sqlSessionFactory.setDataSource(dataSource);PathMatchingResourcePatternResolver pmrpr = new PathMatchingResourcePatternResolver();String mapperPattern = "META-INF/mybatis/*.xml";Resource[] configResource = pmrpr.getResources(mapperPattern);sqlSessionFactory.setMapperLocations(configResource);sqlSessionFactory.setConfigLocation(new ClassPathResource("META-INF/mybatis-configs.xml"));return sqlSessionFactory;} }

(3)mybatis xml文件配置，為上面的mybatis-configs.xml，用于日志打印，包名使用別名等

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"><configuration><settings><!-- 打印sql日志 --><setting name="logImpl" value="STDOUT_LOGGING" /></settings></configuration>

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