Question

我正在尝试为spring boot jpa应用程序创建自定义事务管理器。我的配置类是

`package com.example.demo.config;
import org.springframework.beans.factory.annotation.Value;
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.jdbc.datasource.DriverManagerDataSource;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import javax.sql.DataSource;
import java.util.HashMap;
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        entityManagerFactoryRef = "omniEntityManagerFactory",
        transactionManagerRef = "omniTransactionManager",
        basePackages = "com.example.demo.repository"
)
public class OmniDataSourceConfig {
    @Value("${omni.datasource.driver-class-name}")
    private String dbDriver;    
    @Value("${omni.datasource.url}")
    private String dbConnUrl;    
    @Value("${omni.datasource.username}")
    private String dbUsername;    
    @Value("${omni.datasource.password}")
    private String dbPassword;    
    @Value("${spring.jpa.hibernate.ddl-auto}")
    private String hibernateDDL;    
    @Value("${omni.jpa.properties.hibernate.dialect}")
    private String hibernateDialect;    
    @Bean
    @Primary
    public DataSource omniDataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(dbDriver);
        dataSource.setUrl(dbConnUrl);
        dataSource.setUsername(dbUsername);
        dataSource.setPassword(dbPassword);
        return dataSource;
    }    
    @Bean
    @Primary
    public LocalContainerEntityManagerFactoryBean omniEntityManagerFactory() {
        LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
        factory.setDataSource(omniDataSource());
        factory.setPackagesToScan("com.example.demo.model");
        HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        factory.setJpaVendorAdapter(vendorAdapter);
        HashMap<String, Object> properties = new HashMap<>();
        properties.put("hibernate.hbm2ddl.auto", hibernateDDL);
        properties.put("hibernate.dialect", hibernateDialect);
        factory.setJpaPropertyMap(properties);
        return factory;
    }

    @Bean
    @Primary
    public PlatformTransactionManager omniTransactionManager() {
        JpaTransactionManager transactionManager = new JpaTransactionManager();            transactionManager.setEntityManagerFactory(omniEntityManagerFactory().getObject());
        return transactionManager;
    }
}
`

存储库为

    package com.example.demo.repository;
import com.example.demo.model.Child;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository
public interface ChildRepository extends JpaRepository<Child, Integer> {
}

Application.properties

data.spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true
omni.datasource.driver-class-name=com.mysql.jdbc.Driver
omni.datasource.url=jdbc:mysql://localhost:3306/test?useSSL=false&allowPublicKeyRetrieval=true
omni.datasource.username=root
omni.datasource.password=root
omni.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL8Dialect

实体类为

package com.example.demo.model;    
import javax.persistence.*;
import java.util.Date;    
@Entity
@Table(name = "Child")
public class Child {
    @Id
    @GeneratedValue(generator = "sequence", strategy = GenerationType.IDENTITY)
    @SequenceGenerator(name = "sequence", allocationSize = 1)
    int i;
    @Column(name = "firstName")
    String firstName;
    @Column(name = "lastName")
    String lastName;
    @Temporal(TemporalType.TIMESTAMP)
    Date date;    
    public Child(String firstName, String lastName, Date date) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.date = date;
    }
}

POM

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://maven.apache.org/POM/4.0.0"
         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>
    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.9.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>demoCore</groupId>
    <artifactId>demo</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

错误

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.    
Reason: Failed to determine a suitable driver class       
Action:    
Consider the following:
    If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.
    If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active).

奇怪的是，如果我尝试通过Spring Boot创建配置类，即不使用appliaction .properties中的相同键和值手动创建事务管理器，则它可以正常工作。我想念什么？

使用Custom Transaction Manager的Spring数据Jpa

0 个答案: