Question

我尝试更新21-points.com应用以使用latest code中的JHipster Mini-Book。这是我到目前为止所做的：

使用Heroku的pg:pull命令将我的生产数据库复制到本地数据库：
```
heroku pg:pull HEROKU_POSTGRESQL_GRAY_URL health --app health-by-points
```

安装Liquibase并将PostgreSQL数据库驱动程序复制到$ LIQUIBASE_HOME / lib。

[mraible:/opt/tools/liquibase-3.5.3-bin] % cp ~/.m2/repository/org/postgresql/postgresql/9.4.1212/postgresql-9.4.1212.jar lib/.

Ran liquibase的“diffChangeLog”生成一个更改日志，以便从旧数据库迁移到新模式。

./liquibase \
--driver=org.postgresql.Driver --url=jdbc:postgresql://localhost:5432/health --username=postgres \
diffChangeLog \
--referenceUrl=jdbc:postgresql://localhost:5432/twentyonepoints \
--referenceUsername=twentyonepoints --referencePassword=21points

将输出复制到src/main/resources/config/liquibase/changelog/20171024115100_migrate_from_v2.xml并添加到config/liquibase/master.xml。
在我最新的JHipster应用程序中更改了application-prod.xml，指向我从Heroku下载的旧数据库。

跑./gradlew -Pprod。启动时出错：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'liquibase' defined in class path resource [org/jhipster/health/config/DatabaseConfiguration.class]: Invocation of init method failed; nested exception is liquibase.exception.ValidationFailedException: Validation Failed:
 2 change sets check sum
      config/liquibase/changelog/00000000000000_initial_schema.xml::00000000000000::jhipster was: 7:eda8cd7fd15284e6128be97bd8edea82 but is now: 7:a6235f40597a13436aa36c6d61db2269
      config/liquibase/changelog/00000000000000_initial_schema.xml::00000000000001::jhipster was: 7:e87abbb935c561251405aea5c91bc3a4 but is now: 7:29cf7a7467c2961e7a2366c4347704d7

使用以下命令更新数据库中的md5sum。

update databasechangelog set md5sum = '7:a6235f40597a13436aa36c6d61db2269' where md5sum = '7:eda8cd7fd15284e6128be97bd8edea82';
update databasechangelog set md5sum = '7:29cf7a7467c2961e7a2366c4347704d7' where md5sum = '7:e87abbb935c561251405aea5c91bc3a4’;

试图再次跑。

2017-10-24 12:12:02.670 ERROR 22960 --- [           main] liquibase                                : classpath:config/liquibase/master.xml: config/liquibase/changelog/20160831020048_added_entity_Points.xml::20160831020048-1::jhipster: Change Set config/liquibase/changelog/20160831020048_added_entity_Points.xml::20160831020048-1::jhipster failed.  Error: ERROR: relation "points" already exists [Failed SQL: CREATE TABLE public.points (id BIGINT NOT NULL, jhi_date date NOT NULL, exercise INT, meals INT, alcohol INT, notes VARCHAR(140), user_id BIGINT, CONSTRAINT PK_POINTS PRIMARY KEY (id))]
2017-10-24 12:12:02.672  WARN 22960 --- [           main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'liquibase' defined in class path resource [org/jhipster/health/config/DatabaseConfiguration.class]: Invocation of init method failed; nested exception is liquibase.exception.MigrationFailedException: Migration failed for change set config/liquibase/changelog/20160831020048_added_entity_Points.xml::20160831020048-1::jhipster:
 Reason: liquibase.exception.DatabaseException: ERROR: relation "points" already exists [Failed SQL: CREATE TABLE public.points (id BIGINT NOT NULL, jhi_date date NOT NULL, exercise INT, meals INT, alcohol INT, notes VARCHAR(140), user_id BIGINT, CONSTRAINT PK_POINTS PRIMARY KEY (id))]

知道它为什么要再次创建我的数据库表吗？是因为我改变了md5sum吗？

这些看起来像是从旧的JHipster生成的架构迁移到全新架构时要采取的正确步骤吗？旧架构和新架构之间的唯一区别是旧架构在preferences_id表中有user列，而新架构在user_id表中有preferences列

Answer 1

我会做的几乎一样：在第7步，我会继续使用liquibase方法来处理校验和，即我会从命令行使用clearCheckSums，然后在下一次运行时，所有校验和都将被重新计算并且如果在步骤8中仍然存在关于想要再次运行的脚本的错误，那么您可以从命令行使用changelogSync，如：

./liquibase --driver=org.postgresql.Driver --url=jdbc:postgresql://localhost:5432/health --username=postgres clearCheckSums ./liquibase --driver=org.postgresql.Driver --url=jdbc:postgresql://localhost:5432/health --username=postgres changelogSync

如何使用Liquibase和JHipster迁移现有的生产数据库？

1 个答案: