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這篇文章主要介紹了Spring Boot+Jpa多數(shù)據(jù)源配置的示例分析，具有一定借鑒價(jià)值，感興趣的朋友可以參考下，希望大家閱讀完這篇文章之后大有收獲，下面讓小編帶著大家一起了解一下。
步驟
1.application.yml文件中，配置數(shù)據(jù)庫(kù)源。這里primary是主庫(kù)，secondary是從庫(kù)。
server: port: 8089 # 多數(shù)據(jù)源配置 #primary spring: primary: datasource: url: jdbc:mysql://127.0.0.1:3306/database1?autoReconnect=true&useUnicode=true&characterEncoding=UTF-8&useSSL=false&useLegacyDatetimeCode=false&serverTimezone=Asia/Shanghai username: root password: ****** driver-class-name: com.mysql.jdbc.Driver #secondary secondary: datasource: url: jdbc:mysql://127.0.0.1:3306/database1?autoReconnect=true&useUnicode=true&characterEncoding=UTF-8&useSSL=false&useLegacyDatetimeCode=false&serverTimezone=Asia/Shanghai username: root password: ****** driver-class-name: com.mysql.jdbc.Driver jpa: hibernate: primary-dialect: org.hibernate.dialect.MySQL5Dialect secondary-dialect: org.hibernate.dialect.MySQL5Dialect open-in-view: true show-sql: true
2.創(chuàng)建一個(gè)Spring配置類(lèi)，其中spring.primary.datasource的路徑參考yml文件的配置。
@Configuration
public class DataSourceConfig {
@Bean(name = "primaryDataSource")
@Qualifier("primaryDataSource")
@ConfigurationProperties(prefix="spring.primary.datasource")
public DataSource primaryDataSource() {
return DataSourceBuilder.create().build();
}
@Bean(name = "secondaryDataSource")
@Qualifier("secondaryDataSource")
@Primary
@ConfigurationProperties(prefix="spring.secondary.datasource")
public DataSource secondaryDataSource() {
return DataSourceBuilder.create().build();
}
}3.分別創(chuàng)建主庫(kù)、從庫(kù)的配置類(lèi)。
注意：entity包和dao包的配置，以及@Primary注解指定主庫(kù)。
主庫(kù)配置類(lèi)：
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
entityManagerFactoryRef = "entityManagerFactoryPrimary",
transactionManagerRef = "transactionManagerPrimary",
basePackages = {"com.infinitus.yunxiao_data.dao.primary"}) //設(shè)置Repository所在位置
public class PrimaryConfig {
@Autowired
private JpaProperties jpaProperties;
@Autowired
@Qualifier("primaryDataSource")
private DataSource primaryDataSource;
@Primary
@Bean(name = "entityManagerPrimary")
public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
return entityManagerFactoryPrimary(builder).getObject().createEntityManager();
}
@Primary
@Bean(name = "entityManagerFactoryPrimary")
public LocalContainerEntityManagerFactoryBean entityManagerFactoryPrimary(EntityManagerFactoryBuilder builder) {
return builder
.dataSource(primaryDataSource)
.properties(getVendorProperties(primaryDataSource))
.packages("com.infinitus.yunxiao_data.entity.primary") //設(shè)置實(shí)體類(lèi)所在位置
.persistenceUnit("primaryPersistenceUnit")
.build();
}
private Map getVendorProperties(DataSource dataSource) {
return jpaProperties.getHibernateProperties(dataSource);
}
@Primary
@Bean(name = "transactionManagerPrimary")
public PlatformTransactionManager transactionManagerPrimary(EntityManagerFactoryBuilder builder) {
return new JpaTransactionManager(entityManagerFactoryPrimary(builder).getObject());
}
}從庫(kù)的配置類(lèi)：
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
entityManagerFactoryRef = "entityManagerFactorySecondary",
transactionManagerRef = "transactionManagerSecondary",
basePackages = {"com.infinitus.yunxiao_data.dao.secondary"}) //設(shè)置Repository所在位置
public class SecondaryConfig {
@Autowired
private JpaProperties jpaProperties;
@Autowired
@Qualifier("secondaryDataSource")
private DataSource secondaryDataSource;
@Bean(name = "entityManagerSecondary")
public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
return entityManagerFactorySecondary(builder).getObject().createEntityManager();
}
@Bean(name = "entityManagerFactorySecondary")
public LocalContainerEntityManagerFactoryBean entityManagerFactorySecondary(EntityManagerFactoryBuilder builder) {
return builder
.dataSource(secondaryDataSource)
.properties(getVendorProperties(secondaryDataSource))
.packages("com.infinitus.yunxiao_data.entity.secondary") //設(shè)置實(shí)體類(lèi)所在位置
.persistenceUnit("primaryPersistenceUnit")
.build();
}
private Map getVendorProperties(DataSource dataSource) {
return jpaProperties.getHibernateProperties(dataSource);
}
@Bean(name = "transactionManagerSecondary")
PlatformTransactionManager transactionManagerSecondary(EntityManagerFactoryBuilder builder) {
return new JpaTransactionManager(entityManagerFactorySecondary(builder).getObject());
}
}4.分別創(chuàng)建主、從庫(kù)dao類(lèi)。
主dao：
@Repository
public interface PrimaryRepository extends JpaRepository<PrimaryEntity, Long> {
@Query(value = "SELECT p FROM PrimaryEntity p")
List<PrimaryEntity> queryList();
}從dao：
@Repository
public interface SecondaryRepository extends JpaRepository<SecondaryEntity, Long> {
@Query(value = "SELECT p FROM SecondaryEntity p")
List<SecondaryEntity> queryList();
}5.分別創(chuàng)建主、從庫(kù)entity類(lèi)。
主entity：
@Entity
@Table(name = "holiday_scheme")
@EntityListeners(AuditingEntityListener.class)
public class PrimaryEntity extends AbstractPersistable<Long> {
@Column(name = "date")
public String date;
@Column(name = "hour")
public String hour;
@Column(name = "holiday")
public String holiday;
@Column(name = "holiday_explain")
public String holiday_explain;
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
public String getHour() {
return hour;
}
public void setHour(String hour) {
this.hour = hour;
}
public String getHoliday() {
return holiday;
}
public void setHoliday(String holiday) {
this.holiday = holiday;
}
public String getHoliday_explain() {
return holiday_explain;
}
public void setHoliday_explain(String holiday_explain) {
this.holiday_explain = holiday_explain;
}
@Override
public String toString() {
return "PrimaryEntity{" +
"date='" + date + '\'' +
", hour='" + hour + '\'' +
", holiday='" + holiday + '\'' +
", holiday_explain='" + holiday_explain + '\'' +
'}';
}
}從entity：
@Entity
@Table(name = "active_dashboards")
@EntityListeners(AuditingEntityListener.class)
public class SecondaryEntity extends AbstractPersistable<Long> {
@Column(name = "dashboard_id")
public String dashboard_id;
@Column(name = "user_id")
public String user_id;
@Column(name = "order_index")
public String order_index;
public String getDashboard_id() {
return dashboard_id;
}
public void setDashboard_id(String dashboard_id) {
this.dashboard_id = dashboard_id;
}
public String getUser_id() {
return user_id;
}
public void setUser_id(String user_id) {
this.user_id = user_id;
}
public String getOrder_index() {
return order_index;
}
public void setOrder_index(String order_index) {
this.order_index = order_index;
}
@Override
public String toString() {
return "SecondaryEntity{" +
"dashboard_id='" + dashboard_id + '\'' +
", user_id='" + user_id + '\'' +
", order_index='" + order_index + '\'' +
'}';
}
}6.controller請(qǐng)求獲取不同數(shù)據(jù)庫(kù)的數(shù)據(jù)。
@RestController
@RequestMapping("/database")
public class MailController {
private final Logger logger = LoggerFactory.getLogger(this.getClass());
@Autowired
PrimaryRepository primaryRepository;
@Autowired
SecondaryRepository secondaryRepository;
@RequestMapping("/primary")
@ResponseBody
public String primary() {
return primaryRepository.queryList().toString();
}
@RequestMapping("/secondary")
@ResponseBody
public String secondary() {
return secondaryRepository.queryList().toString();
}
}注意
下面提兩個(gè)在配置多數(shù)據(jù)源時(shí)遇到的坑點(diǎn)，一不注意就掉坑了。
1.Application類(lèi)不需要配置@EnableJpaRepositories注解，會(huì)報(bào)如下錯(cuò)誤。
A component required a bean named 'entityManagerFactory' that could not be f
2.注意檢查dao類(lèi)，獲取數(shù)據(jù)的方法上格式是否正確，有沒(méi)有某個(gè)字段是表中不存在的，避免啟動(dòng)異常。如下，SecondaryEntity表中是不存在job_name字段的，所以注釋掉才能啟動(dòng)成功等。
//@Query(value = "SELECT p FROM SecondaryEntity p where p.job_name = ?1") //List<SecondaryEntity> queryOdcRecord(String job_name);
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