[英]Two datasources, two repositories in Spring Boot 2.2.0
我检查了博客文章,教程,人们的资料库,但没有任何帮助。 这是我所拥有的:
有两个带有MySQL数据库的Docker容器: ebooks
和sec
。 两个容器都打开,数据库可见,我可以查询表。
我想在项目中有两个数据源:一个用于电子书,一个用于Spring Security表。
我编写了一个简单的CommandLineRunner
,仅在其中自动连接两个存储库并检查它们的大小。
运行应用程序时,我得到:
Caused by: java.sql.SQLSyntaxErrorException: Table 'ebooks.Book' doesn't exist
但是,如果我没有第二个数据源并且使用常规的Spring自动配置来运行它,那么表BOOKS是“可见的”并且可以查询它。
所以这是我的application.properties
:
book.datasource.url=jdbc:mysql://172.17.0.2:3306/ebooks
book.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
book.datasource.username=someuser
book.datasource.password=somepass
security.datasource.url=jdbc:mysql://172.17.0.3:3306/sec
security.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
security.datasource.username=someuser
security.datasource.password=somepass
我的实体类很小:
@Entity
public class Book {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
private String title;
private String author;
private int locations;
public Book() {
}
public Book(String title, String author, int locations) {
this.title = title;
this.author = author;
this.locations = locations;
}
public Book(int id, String title, String author, int locations) {
this(title, author, locations);
this.id = id;
}
// ... getters setters and so on
}
@Entity
public class Role {
@Id
@GeneratedValue
private int id;
private String roleName;
public Role() {
}
public Role(int id, String roleName) {
this.id = id;
this.roleName = roleName;
}
// ... getters and setters
}
这些类位于不同的程序包中。
同样,存储库也没什么花哨的:
@Repository
public interface RoleRepository extends JpaRepository<Role, Integer> {
}
与书籍类似,因此我不会粘贴。
这是配置类:
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
basePackages = "rnd.mate00.twodatasources.model1",
entityManagerFactoryRef = "bookEntityManagerFactory",
transactionManagerRef = "bookTransactionManager")
public class BookDatasourceConfiguration {
@Value("${book.datasource.driver-class-name}")
private String driver;
@Value("${book.datasource.url}")
private String url;
@Value("${book.datasource.username}")
private String user;
@Value("${book.datasource.password}")
private String pass;
@Bean
@Primary
public DataSource bookDataSource() {
System.out.println("Configuring book.datasources");
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName(driver);
dataSource.setUrl(url);
dataSource.setUsername(user);
dataSource.setPassword(pass);
return dataSource;
}
@Bean
@Primary
public LocalContainerEntityManagerFactoryBean bookEntityManagerFactory(EntityManagerFactoryBuilder builder) {
return builder
.dataSource(bookDataSource())
.packages("rnd.mate00.twodatasources.model1")
.persistenceUnit("booksPU")
.build();
}
@Bean
@Primary
public TransactionManager bookTransactionManager(EntityManagerFactoryBuilder builder) {
JpaTransactionManager manager = new JpaTransactionManager();
manager.setDataSource(bookDataSource());
manager.setEntityManagerFactory(bookEntityManagerFactory(builder).getObject());
return manager;
}
}
第二个是单独的课程:
@Configuration
@EnableJpaRepositories(
basePackageClasses = { Role.class },
entityManagerFactoryRef = "securityEntityManagerFactory",
transactionManagerRef = "securityTransactionManager"
)
public class SecurityDatasourceConfiguration {
@Value("${security.datasource.driver-class-name}")
private String driver;
@Value("${security.datasource.url}")
private String url;
@Value("${security.datasource.username}")
private String user;
@Value("${security.datasource.password}")
private String pass;
@Bean
public DataSource securityDataSource() {
System.out.println("Configuring security.datasources");
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName(driver);
dataSource.setUrl(url);
dataSource.setUsername(user);
dataSource.setPassword(pass);
return dataSource;
}
@Bean
public LocalContainerEntityManagerFactoryBean securityEntityManagerFactory(EntityManagerFactoryBuilder builder) {
return builder
.dataSource(securityDataSource())
.packages(Role.class)
.persistenceUnit("securityPU")
.build();
}
@Bean
public TransactionManager securityTransactionManager(EntityManagerFactoryBuilder builder) {
JpaTransactionManager manager = new JpaTransactionManager();
manager.setDataSource(securityDataSource());
manager.setEntityManagerFactory(securityEntityManagerFactory(builder).getObject());
return manager;
}
}
Entrypoint类除了@SpringBootApplication
之外没有其他注释。
这是build.gradle
:
plugins {
id 'org.springframework.boot' version '2.2.0.M4'
id 'java'
}
apply plugin: 'io.spring.dependency-management'
group = 'rnd.mate00'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '11'
repositories {
mavenCentral()
maven { url 'https://repo.spring.io/milestone' }
}
dependencies {
runtime('com.h2database:h2')
compile('mysql:mysql-connector-java')
implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
implementation 'org.springframework.boot:spring-boot-starter-web'
testImplementation('org.springframework.boot:spring-boot-starter-test') {
exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
exclude group: 'junit', module: 'junit'
}
}
test {
useJUnitPlatform()
}
当有多个相同类型的bean时,@ @Qualifier
批注用于解决自动装配冲突。
@Bean
@Primary
@Qualifier("bookBean")
public DataSource bookDataSource() {
System.out.println("Configuring book.datasources");
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName(driver);
dataSource.setUrl(url);
dataSource.setUsername(user);
dataSource.setPassword(pass);
return dataSource;
}
与另一个数据源相同。 注意 : 如果使用的是现场注入或setter注入,则必须将@Autowired和@Qualifier放置在现场或setter函数的顶部
@Autowired
@Qualifier("bookBean")
private final BookRepository repo;
噢,我的...缺少的是带有表名的@Entity
注释。 所以:
@Entity(name = "book")
// ... and
@Entity(name = "role")
加上带有相关列名的正确@Column
注释。 我将链接附加到我的小型仓库中,在其中放置了一个工作示例: https : //github.com/mate0021/two_datasources.git
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