最近开辟了一个新项目,因为初期考虑到可能会调整数据库的风险,所以orm,在设计之初就考虑为Spring Data Jpa, 以下是工程data层数据,整体是参照配置多数据源的方案,进行配置的

目录

• 因为阿里数据源Druid
• 整合数据源及其他事务配置
• pom依赖

整合事务

@EnableAutoConfiguration
@SpringBootApplication
@EnableTransactionManagement
@ComponentScan(basePackages = {"com.inn.developer"})
public class CodeApplication {
    public static void main(String[] args) {
        new SpringApplicationBuilder().web(true).sources(CodeApplication.class).run(args);
    }
}

创建DruidProperties配置

@Data
@AllArgsConstructor
@NoArgsConstructor
@ConfigurationProperties(prefix = "druid")
public class DruidProperties {
...

数据库参数可以参考:

• 配置说明：

1：minEvictableIdleTimeMillis(最大空闲时间)：默认为30分钟，配置里面不进行设置。

2：testOnBorrow ,testOnReturn 默认为关闭，可以设置为不配置。

3：testWhileIdle(在获取连接后，确定是否要进行连接空闲时间的检查)。默认为true。配置里面不再进行设置。

• 流程说明：

1：在第一次调用connection的时候，才会进行 initialSize的初始化。

2：心跳检测时间线程，会休眠timeBetweenEvictionRunsMillis时间，然后只对(没有borrow的线程 减去 minIdle)的线程进行检查，如果空闲时间大于minEvictableIdleTimeMillis则进行close。

3：testWhileIdle必须设置为true，在获取到连接后，先检查testOnBorrow，然后再判定testwhileIdle，如果连接空闲时间大于timeBetweenEvictionRunsMillis，则会进行心跳检测。

4：不需要配置validationQuery，如果不配置的情况下会走ping命令，性能更高。

5：连接保存在数组里面，获取连接的时候，获取数组的最后一位。在imeBetweenEvictionRunsMillis时是从前往后进行检查连接的有效性。

配置数据源及hibernate适配

数据源对象创建还是和之前一样,
笔者不太喜欢xml的方式,所以还是采用配置类

DruidAutoJpaConfiguration

@Configuration
@EnableConfigurationProperties(DruidProperties.class)//开启属性注入,通过@autowired注入
@ConditionalOnClass(DruidDataSource.class)//表示对应的类在classpath目录下存在时，才会去解析对应的配置文件
@ConditionalOnProperty(prefix = "druid", name = "url")
@EnableJpaRepositories(basePackages = "com.inn.developer.model.dao",transactionManagerRef = "jpaTransactionManager", entityManagerFactoryRef = "localContainerEntityManagerFactoryBean")
public class DruidAutoJpaConfiguration {
    @Autowired
    private DruidProperties properties;

    @Bean(name = "druidDataSource")
    @Primary
    public DataSource dataSource() {
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setUrl(properties.getUrl());
        dataSource.setUsername(properties.getUsername());
        dataSource.setPassword(properties.getPassword());
        dataSource.setTimeBetweenEvictionRunsMillis(properties.getTimeBetweenEvictionRunsMillis());
        if (properties.getInitialSize() > 0) {
            dataSource.setInitialSize(properties.getInitialSize());
        }
        if (properties.getMinIdle() > 0) {
            dataSource.setMinIdle(properties.getMinIdle());
        }
        if (properties.getMaxActive() > 0) {
            dataSource.setMaxActive(properties.getMaxActive());
        }
        dataSource.setTestOnBorrow(properties.isTestOnBorrow());
        dataSource.setValidationQuery("select version()");
        try {
            dataSource.init();
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
        return dataSource;
    }


    /**
     * hibernate 适配器,定制方言为mysql,并打印sql
     *
     * @return
     */
    @Bean(name = "hibernateJpaVendorAdapter")
    @Primary
    public HibernateJpaVendorAdapter hibernateJpaVendorAdapter() {
        HibernateJpaVendorAdapter hibernateJpaVendorAdapter = new HibernateJpaVendorAdapter();
        hibernateJpaVendorAdapter.setShowSql(true);
        hibernateJpaVendorAdapter.setDatabasePlatform("org.hibernate.dialect.MySQL5Dialect");
        return hibernateJpaVendorAdapter;
    }

    @Bean(name = "localContainerEntityManagerFactoryBean")
    @Primary
    public LocalContainerEntityManagerFactoryBean entityManagerFactoryBean(@Qualifier("druidDataSource") DataSource dataSource
            ,@Qualifier("hibernateJpaVendorAdapter") HibernateJpaVendorAdapter hibernateJpaVendorAdapter) {
        LocalContainerEntityManagerFactoryBean local = new LocalContainerEntityManagerFactoryBean();
        local.setDataSource(dataSource);
        local.setJpaVendorAdapter(hibernateJpaVendorAdapter);
        local.setPackagesToScan("com.inn.developer.model.domain");
        Properties properties = new Properties();
        properties.put("hibernate.format_sql", true);
        properties.put("hibernate.hbm2ddl.auto", "update");
        local.setJpaProperties(properties);
        return local;
    }

    @Bean(name = "jpaTransactionManager")
    @Primary
    public JpaTransactionManager jpaTransactionManager(@Qualifier("localContainerEntityManagerFactoryBean") LocalContainerEntityManagerFactoryBean entityManagerFactoryBean) {
        JpaTransactionManager jpaTransactionManager = new JpaTransactionManager();
        EntityManagerFactory object = entityManagerFactoryBean.getObject();
        jpaTransactionManager.setEntityManagerFactory(object);
        return jpaTransactionManager;
    }

pom依赖

 <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        
         <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.6</version>
            <scope>provided</scope>
        </dependency>
        
          <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.11</version>
        </dependency>
        
         <!--依赖Spring 4.3.6之core、context、aop、beans、tx、orm和spring data commons -->
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-jpa</artifactId>
            <version>1.11.3.RELEASE</version>
        </dependency>

        <!--hibernate 实现JPA的框架 -->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>5.2.5.Final</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-core -->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>5.2.11.Final</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-annotations -->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-annotations</artifactId>
            <version>3.5.6-Final</version>
        </dependency>