在 flyway 迁移脚本之前执行 JPA table 创建

Question

我想使用此 Spring 属性文件进行数据库配置。

spring.jmx.enabled=false
spring.datasource.jndi-name=java:/global/production
spring.datasource.driver-class-name=org.mariadb.jdbc.Driver
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MariaDBDialect
spring.jpa.show-sql = true
spring.jpa.hibernate.ddl-auto = update
request.limit=300000
spring.flyway.baselineOnMigrate = true
spring.flyway.locations=classpath:/db/migration

代码运行良好，但不幸的是，当删除所有表后数据库为空时，我得到 SQL 错误，因为首先执行了迁移脚本。

如何先配置 JPA 来创建表，然后配置 flyway 来执行迁移脚本？

Answer 1

在休眠执行之前迁移运行。您可以通过查看引导顺序来做到这一点。为此，您需要添加此配置 class:

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);
}


}

查看this答案你会得到详细信息。

Answer 2

为了避免循环依赖这样写：

@Configuration
public class FlywayConfig {

    @Bean
    FlywayMigrationInitializer flywayInitializer(Flyway flyway) {
        return new FlywayMigrationInitializer(flyway, (f) -> {
        });
    }

    static class Dummy {
    }

    @Bean
    @DependsOn("entityManagerFactory")
    Dummy delayedFlywayInitializer(Flyway flyway, FlywayProperties flywayProperties) {
        if (flywayProperties.isEnabled())
            flyway.migrate();
        return new Dummy();
    }
}

灵感来自this答案

在 flyway 迁移脚本之前执行 JPA table 创建

Execute JPA table creation before flyway migration script

spring

jpa

flyway

spring-boot