spring:
  application:
    name: t3cc
  datasource:
    primary:
        jdbc-url: jdbc:mysql://${MYSQL_HOST:localhost}:${MYSQL_PORT:3306}/${DB_NAME:anbang}?useUnicode=true&characterEncoding=UTF8&serverTimezone=Hongkong
        username: root
        password: root
    secondary:
        jdbc-url: jdbc:mysql://${MYSQL_HOST:localhost}:${MYSQL_PORT:3306}/${DB_NAME:anbang1}?useUnicode=true&characterEncoding=UTF8&serverTimezone=Hongkong
        username: root
        password: root
  jpa:
    database: mysql
    database-platform: org.hibernate.dialect.MySQL5InnoDBDialect  #不加這句則默認為myisam引擎
    hibernate:
      ddl-auto: update
      naming:
        physical-strategy: org.springframework.boot.orm.jpa.hibernate.SpringPhysicalNamingStrategy
    open-in-view: true
    properties:
        enable_lazy_load_no_trans: true
    show-sql: true
  cloud:
    nacos:
      discovery:
        server-addr: ${NACOS_SERVER:localhost:8848}
###############################---log---##############################
logging:
  file: ./logback.log

yml里配置了兩個數據源，和一些jpa和Hibernate的配置。

下面是DataSource的配置

/**
 * @author wuweifeng wrote on 2019/3/5.
 */
@Configuration
public class DataSourceConfig { 
    @Primary
    @Bean(name = "primaryDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.primary")
    public DataSource dataSourceOrder() {
        return DataSourceBuilder.create().build();
    }
 
    @Bean(name = "secondaryDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.secondary")
    public DataSource dataSourceAuth() {
        return DataSourceBuilder.create().build();
    } 
}

下面是第一個數據源的配置

package com.mm.dmp.t3cc.config; 
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateProperties;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateSettings;
import org.springframework.boot.autoconfigure.orm.jpa.JpaProperties;
import org.springframework.boot.orm.jpa.EntityManagerFactoryBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
 
import javax.annotation.Resource;
import javax.persistence.EntityManager;
import javax.sql.DataSource;
 
/**
 * @author wuweifeng wrote on 2019/3/5.
 */
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        entityManagerFactoryRef = "entityManagerFactoryPrimary",
        transactionManagerRef = "transactionManagerPrimary",
        basePackages = {"com.mm.dmp.t3cc.core.repository.one"})
public class OneConfig {
 
    @Resource
    @Qualifier("primaryDataSource")
    private DataSource primaryDataSource;
 
    @Primary
    @Bean(name = "entityManagerPrimary")
    public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
        return entityManagerFactoryPrimary(builder).getObject().createEntityManager();
    }
 
    @Resource
    private JpaProperties jpaProperties;
 
    @Resource
    private HibernateProperties properties;
 
    /**
     * 設置實體類所在位置
     */
    @Primary
    @Bean(name = "entityManagerFactoryPrimary")
    public LocalContainerEntityManagerFactoryBean entityManagerFactoryPrimary(EntityManagerFactoryBuilder builder) { 
        LocalContainerEntityManagerFactoryBean entityManagerFactory = builder
                .dataSource(primaryDataSource)
                //.packages(classes)
                //設置實體類所在位置
                .packages("com.mm.dmp.t3cc.core.entity.one")
                .persistenceUnit("primaryPersistenceUnit")
                //.properties(jpaProperties.getProperties())
                .properties(properties.determineHibernateProperties(jpaProperties.getProperties(), new HibernateSettings()))
                .build();
        return entityManagerFactory;
    }
 
    @Primary
    @Bean(name = "transactionManagerPrimary")
    public PlatformTransactionManager transactionManagerPrimary(EntityManagerFactoryBuilder builder) {
        return new JpaTransactionManager(entityManagerFactoryPrimary(builder).getObject());
    } 
}

這里會和別人的配置不一樣，主要區(qū)別在于HibernateProperties。別人的在第61行，我注釋掉的那行，會直接使用jpaProperties.getProperties()。當你這樣寫之后，會發(fā)現yml里配置的Hibernate的update自動生成表，和命名方式并沒有生效。

原因我們可以看一下。

這里就是jpaProperties.getProperties()的地方，如果打斷點可以看到，只有箭頭這一個配置被加載進去了。上面的Hibernate的ddl和naming并沒有進去。

來看一下HibernateProperties

這里才是真正讓自動建表生效的地方，然而并沒有加載進去。那么就需要我們手工來添加了。

這里面有個determineHibernateProperties方法，就是來組合jpaProperties和HibernateProperties的地方。我們應該使用這個方法來組合整個配置的map對象。

也就是在OneConfig類中，把兩個Properties都定義出來，然后組合一下，就是箭頭的地方。在debug時，就可以看到Hibernate的配置也都加載進來了。

OK，以上就是動態(tài)數據源配置Hibernate自動建表不生效的原因。

下面是第二個數據源的配置

package com.mm.dmp.t3cc.config; 
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateProperties;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateSettings;
import org.springframework.boot.autoconfigure.orm.jpa.JpaProperties;
import org.springframework.boot.orm.jpa.EntityManagerFactoryBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
 
import javax.annotation.Resource;
import javax.persistence.EntityManager;
import javax.sql.DataSource;
 
/**
 * @author wuweifeng wrote on 2019/3/5.
 */
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        entityManagerFactoryRef = "entityManagerFactorySecondary",
        transactionManagerRef = "transactionManagerSecondary",
        basePackages = {"com.mm.dmp.t3cc.core.repository.two"}) //設置Repository所在位置
public class TwoConfig {
 
    @Resource
    @Qualifier("secondaryDataSource")
    private DataSource secondaryDataSource;
 
    @Resource
    private JpaProperties jpaProperties;
 
    @Resource
    private HibernateProperties properties;
 
    @Bean(name = "entityManagerSecondary")
    public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
        return entityManagerFactorySecondary(builder).getObject().createEntityManager();
    }
 
    @Bean(name = "entityManagerFactorySecondary")
    public LocalContainerEntityManagerFactoryBean entityManagerFactorySecondary(EntityManagerFactoryBuilder builder) {
        LocalContainerEntityManagerFactoryBean entityManagerFactory
                = builder
                .dataSource(secondaryDataSource)
                //.packages(classes)
                //設置實體類所在位置
                .packages("com.mm.dmp.t3cc.core.entity.two")
                .persistenceUnit("secondaryPersistenceUnit")
                .properties(properties.determineHibernateProperties(jpaProperties.getProperties(), new
                        HibernateSettings()))
                .build();
        return entityManagerFactory;
    }
 
    @Bean(name = "transactionManagerSecondary")
    public PlatformTransactionManager transactionManagerPrimary(EntityManagerFactoryBuilder builder) {
        return new JpaTransactionManager(entityManagerFactorySecondary(builder).getObject());
    }
}

如果你覺得這樣比較麻煩，并且還有分庫分表的需求，那么可以使用sharding jdbc來操作，移步這一篇文章

以上為個人經驗，希望能給大家一個參考，也希望大家多多支持腳本之家。

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