Springboot2.0配置JPA多数据源连接两个mysql数据库详解

1. 目录结构及配置

 pom.xml(不要乱放太多，会引起jar冲突，亲身体验)

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.luoshupeng</groupId>
    <artifactId>multidatasource</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>SpringBoot2-MultiDataSource</name>
    <description>Spring Boot 2.0 多数据源练习程序</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

2. 配置文件

 

server.port=8080

##\u7B2C\u4E00\u79CD\u65B9\u6CD5
spring.datasource.primary.name=primaryDB
spring.datasource.primary.url=jdbc:mysql://localhost:3306/shiro?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC&useSSL=true
spring.datasource.primary.username=root
spring.datasource.primary.password=
spring.datasource.primary.driver-class-name=com.mysql.jdbc.Driver

##\u7B2C\u4E8C\u79CD\u65B9\u6CD5
spring.datasource.secondary.name=secondaryDB
#spring.datasource.secondary.url=jdbc:h2:mem:test-db2
spring.datasource.secondary.jdbc-url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC&useSSL=true
spring.datasource.secondary.username=root
spring.datasource.secondary.password=
spring.datasource.secondary.driver-class-name=com.mysql.jdbc.Driver

spring.jpa.hibernate.ddl-auto=create-drop
spring.jpa.show-sql=true
spring.jpa.properties.hibernate.hbm2ddl.auto=update
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5InnoDBDialect

 

3. DataSourceConfigurer类（两种方法，取任何一种都可以，此程序中两种都有demo）

@Configuration
public class DataSourceConfigurer {

    /**
     * 第一种方法
     * @return
     */
    @Primary
    @Bean(name = "primaryDataSourceProperties")
    @ConfigurationProperties(prefix = "spring.datasource.primary")
    public DataSourceProperties primaryDataSourceProperties() {
        return new DataSourceProperties();
    }
    @Primary
    @Bean(name = "primaryDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.primary")
    public DataSource primaryDataSource() {
        return primaryDataSourceProperties().initializeDataSourceBuilder().build();
    }
    /**
     * 第二种方法
     * @return
     */
    @Bean(name = "secondaryDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.secondary")
    public DataSource secondaryDataSource() {
        return DataSourceBuilder.create().build();
    }
}

 

 

4. 主数据源配置

（需要改两处，1.注解处basePackages=“****”//此处对应程序dao层 全路径包名，2. LocalContainerEntityManagerFactoryBean方法下的.packeages(“***”)//pojo类全类名）

@Configuration

@EnableTransactionManagement

@EnableJpaRepositories(

        entityManagerFactoryRef = "entityManagerFactoryPrimary",

        transactionManagerRef = "transactionManagerPrimary",

        basePackages = {"com.luoshupeng.multidatasource.primary"})

public class PrimaryConfigurer {

    @Resource(name = "primaryDataSource")

    private DataSource primaryDataSource;

    @Autowired

    private JpaProperties jpaProperties;



    private Map<String, Object> getVendorProperties() {

        return jpaProperties.getHibernateProperties(new HibernateSettings());

    }



    @Primary

    @Bean(name = "entityManagerFactoryPrimary")

    public LocalContainerEntityManagerFactoryBean entityManagerFactoryPrimary(EntityManagerFactoryBuilder builder) {

        return builder.dataSource(primaryDataSource).properties(getVendorProperties())

                .packages("com.luoshupeng.multidatasource.primary").persistenceUnit("primaryPersistenceUnit")

                .build();

    }



    @Primary

    @Bean(name = "entityManagerPrimary")

    public EntityManager entityManager(EntityManagerFactoryBuilder builder) {

        return entityManagerFactoryPrimary(builder).getObject().createEntityManager();

    }



    @Primary

    @Bean(name = "transactionManagerPrimary")

    public PlatformTransactionManager transactionManagerPrimary(EntityManagerFactoryBuilder builder) {

        return new JpaTransactionManager(entityManagerFactoryPrimary(builder).getObject());

    }

}

 

5. 从数据源配置

（需要改两处，1.注解处basePackages=“****”//此处对应程序dao层 全路径包名，2. LocalContainerEntityManagerFactoryBean方法下的.packeages(“***”)//pojo类全类名）

@Configuration

@EnableTransactionManagement

@EnableJpaRepositories(

        transactionManagerRef = "transactionManagerSecondary",

        entityManagerFactoryRef = "entityManagerFactorySecondary",

        basePackages = {"com.luoshupeng.multidatasource.secondary.repository"})

public class SecondaryConfigurer {

    //@Resource(name = "secondaryDataSource")

    @Autowired

    @Qualifier(value = "secondaryDataSource")

    private DataSource secondaryDataSource;

    @Autowired

    private JpaProperties jpaProperties;



    private Map<String, Object> getVendorProperties() {

        return jpaProperties.getHibernateProperties(new HibernateSettings());

    }

    @Bean(name = "entityManagerFactorySecondary")

    public LocalContainerEntityManagerFactoryBean entityManagerFactorySecondary(EntityManagerFactoryBuilder builder) {

        return builder.dataSource(secondaryDataSource).properties(getVendorProperties())

                .packages("com.luoshupeng.multidatasource.secondary.repository").persistenceUnit("secondaryPersistenceUnit")

                .build();

    }

    @Bean(name = "entityManagerSecondary")

    public EntityManager entityManager(EntityManagerFactoryBuilder builder) {

        return entityManagerFactorySecondary(builder).getObject().createEntityManager();

    }
    @Bean(name = "transactionManagerSecondary")

    public PlatformTransactionManager transactionManagerSecondary(EntityManagerFactoryBuilder builder) {

        return new JpaTransactionManager(entityManagerFactorySecondary(builder).getObject());

    }

}

 

6.User实体类模板

package com.luoshupeng.multidatasource.primary.entity;

import javax.persistence.*;

/**
 * Created by luoshupeng on 2018-03-20 10:01
 */
@Entity
@Table(name = "user")
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;
    private String name;
    private Integer age;

    public User() {
    }

    public User(String name, Integer age) {
        this.name = name;
        this.age = age;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

7.dao层模板

//注意！！必须继承JpaRepository
import com.luoshupeng.multidatasource.primary.entity.User;
import org.springframework.data.jpa.repository.JpaRepository;

import java.util.List;

/**
 * Created by luoshupeng on 2018-03-20 10:22
 */
public interface UserRepository extends JpaRepository<User, Integer> {

  List<User> findAll();
}

8.service模板

import com.luoshupeng.multidatasource.primary.entity.User;
import com.luoshupeng.multidatasource.primary.repository.UserRepository;
import com.luoshupeng.multidatasource.baseservice.IBaseService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * Created by luoshupeng on 2018-03-20 10:26
 */
@Service
public class UserService implements IBaseService<User> {

    @Autowired
    UserRepository userRepository;

    @Override
    public List<User> list() {
        return userRepository.findAll();
    }
}

9.IBaseService接口

import java.util.List;

/**
 * Created by luoshupeng on 2018-03-20 10:25
 */
public interface IBaseService<T> {
    List<T> list();
}