在 flyway 迁移脚本之前执行 JPA 表创建

Posted 2023-03-28

【中文标题】在 flyway 迁移脚本之前执行 JPA 表创建

【英文标题】：Execute JPA table creation before flyway migration script

【发布时间】：2019-01-09 06:41:11

【问题描述】：

我想使用这个 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，在删除所有表后数据库为空时，由于首先执行了迁移脚本，因此出现 SQL 错误。

如何配置JPA先创建表，然后flyway执行迁移脚本？

【参考方案1】：

Flyway 迁移在休眠执行之前运行。您可以通过查看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this的回答你会得到详细信息。

【参考方案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