Spring Boot:Hibernate和Flyway启动顺序

Question

我创建了Spring应用程序.附加了Pom xml.

它具有这样的配置(如下)和一些用于Flyway数据库迁移工具的db/migration/V1__init.sql.

它有hsqldb内存数据库,它是在应用程序启动后创建的.创作后很干净.

我希望Hibernate基于实体类创建一个模式,然后Flyway填充表格.现在,Flyway在创建表之前启动V1__init.sql并抛出异常.如何更改此订单或我可以执行哪些解决方案？

spring.datasource.testWhileIdle = true
spring.datasource.validationQuery = SELECT 1
spring.jpa.show-sql = true
spring.jpa.hibernate.ddl-auto = create-drop
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.HSQLDialect

pom.xml中:

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.3.3.RELEASE</version>
    <relativePath/>
</parent>

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

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <version>1.3.2.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.hsqldb</groupId>
        <artifactId>hsqldb</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>4.3.11.Final</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-orm</artifactId>
        <version>4.2.5.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.thymeleaf</groupId>
        <artifactId>thymeleaf-spring4</artifactId>
        <version>2.1.4.RELEASE</version>
    </dependency>

    <!-- For using 'LEGACYHTML5' mode in Thymeleaf -->
    <dependency>
        <groupId>net.sourceforge.nekohtml</groupId>
        <artifactId>nekohtml</artifactId>
        <version>1.9.21</version>
    </dependency>
    <dependency>
        <groupId>xml-apis</groupId>
        <artifactId>xml-apis</artifactId>
        <version>1.4.01</version>
    </dependency>

    <dependency>
        <groupId>org.flywaydb</groupId>
        <artifactId>flyway-core</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
        <version>1.3.3.RELEASE</version>
    </dependency>
</dependencies>

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

Answer 1

我遇到过同样的问题.

我希望我的架构由hibernate创建,因为它具有数据库独立性.我已经遇到了在我的jpa课程中为我的应用程序找出一个很好的架构的麻烦,我不喜欢重复自己.

但我希望一些数据初始化以飞路擅长的版本化方式完成.

Spring引导在休眠之前运行flyway迁移.为了改变它,我覆盖了弹簧启动初始化器,什么都不做.然后我创建了第二个初始化程序,它在hibernate完成后运行.您需要做的就是添加此配置类:

import org.flywaydb.core.Flyway;
import org.springframework.boot.autoconfigure.flyway.FlywayMigrationInitializer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.DependsOn;

@Configuration
public class MigrationConfiguration {


    /**
     * Override default flyway initializer to do nothing
     */
    @Bean
    FlywayMigrationInitializer flywayInitializer(Flyway flyway) {
        return new FlywayMigrationInitializer(flyway, (f) ->{} );
    }


    /**
     * Create a second flyway initializer to run after jpa has created the schema
     */
    @Bean
    @DependsOn("entityManagerFactory")
    FlywayMigrationInitializer delayedFlywayInitializer(Flyway flyway) {
        return new FlywayMigrationInitializer(flyway, null);
    }


}

该代码需要java 8,如果您有java 7或更早版本,请替换(f)->{}为实现FlywayMigrationStrategy的内部类

当然,您可以在xml中轻松完成此操作.

确保将其添加到您的application.properties:

flyway.baselineOnMigrate = true

Answer 2

Flyway的Spring Boot自动配置可确保在初始化Hibernate之前运行数据库迁移.换句话说,您不能依赖Flyway自动配置并使用Flyway来填充由Hinernate创建的表.

一种解决方案是完全接受Flyway并使用它来创建表并填充它们.然后,您可以关闭Hibernate的表创建(spring.jpa.hibernate.ddl-auto=none).这种方法更加强大,因为它可以让您的数据库更容易发展.这就是我建议您这样做的.

另一种解决方案是禁用Flyway(flyway.enabled=false)的自动配置并将其配置为自己.然后,您可以将Flyway配置为依赖于Hibernate,以便在Flyway尝试填充它们之前Hibernate已创建表.

Answer 3

所有 SQL 迁移将在 Hibernate 创建所有表后开始。

Spring Boot 2.2.2，Flyway 6.0.8

要禁用 Flyway 启动，请插入 resources/application.properties：

spring.flyway.enabled=false

为 Flyway 创建单独的配置以使其在 Hibernate 准备就绪时加载：

@Configuration
public class FlywayConfiguration {

    @Autowired
    public FlywayConfiguration(DataSource dataSource) {
        Flyway.configure().baselineOnMigrate(true).dataSource(dataSource).load().migrate();
    }
}

从版本 2 开始您的迁移脚本：

resources/db.migration/V2__fill-tables.sql

V1 用作基线，V1 文件将被忽略。