如何使用 Liquibase 和 JHipster 迁移现有的生产数据库？

Question

我正在尝试更新我的 21-points.com app to use the latest code from the 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
```

已安装 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/.

运行 liquibase 的“diffChangeLog”生成变更日志以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

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

运行./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

运行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’;

再次尝试运行。

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尝试创建我的数据库 tables 吗？是因为我改变了md5sum吗？

从旧的 JHipster 生成的模式迁移到全新的模式时，这些看起来像是您要采取的正确步骤吗？我的旧模式和新模式之间的唯一区别是旧模式在 user table 中有一个 preferences_id 列，而新模式在 [=] 中有一个 user_id 列24=] table.

Answer 1

我会做几乎相同的事情：在第 7 步，我将继续使用 liquibase 方法来处理校验和，即我会在命令行中使用 clearCheckSums from command line and then on next run all the checksums are gone be recomputed and if there still is an error about a script that wants to run again like in step 8 then you can use changelogSync，例如：

./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？

How do I migrate an existing production database with Liquibase and JHipster?

postgresql

heroku

liquibase

jhipster