在flyway迁移脚本之前执行JPA表创建

Question

我想将这个Spring属性文件用于数据库配置。

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，我会收到SQL错误，因为首先执行迁移脚本。

如何先配置 JPA 以创建表，然后再执行迁移脚本？

Answer 1

要避免循环依赖，请这样写：

@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();
    }
}

受到这个答案的启发

Answer 2

Flyway迁移在Hibernate执行之前运行。您可以通过设置启动顺序来做到这一点。为此，您需要添加此配置类：

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);
}


}

看看这个答案，你会得到详细信息。