Liquibase 2.0 -回滚LiquiBase格式的SQL

Question

在2.0中添加了一个非常好的特性，称为LiquiBased格式化的SQL。有关信息http://blog.liquibase.org/2010/05/liquibase-formatted-sql.html，请参阅此链接。

当我试图向我的脚本添加一个回滚命令时，LiquiBase抛出了一个错误。这是我的脚本。

--liquibase formatted sql

--changeset PeterPan:REQ111111
CREATE VIEW all_employees AS
SELECT *
FROM employee;


--rollback 
DROP VIEW all_employees;
--rollback 

我也试过这个

--liquibase formatted sql

--changeset PeterPan:REQ111111
CREATE VIEW all_employees AS
SELECT *
FROM employee;


--rollback 
DROP VIEW all_employees;

下面是我的命令行输入和我得到的输出。注意，我做了成功的更新，然后回滚，这就是失败的原因。还要记住，视图被删除了，只是脚本抛出了一个异常。如果我从构建中删除视图，并运行相同的命令，则更新和回滚都会成功完成。

C:\>liquibase --driver=org.postgresql.Driver --classpath="C:/Program Files/Java/jdk1.6.0_23/lib/postgresql-9.0-801.jdbc4.jar" --url="jdbc:postgresql:/
/localhost:5432/test_db_build" --changeLogFile=C:/DbSource/Common/00_main_changelog.xml --username=postgres --password=password update
INFO 3/3/11 10:05 AM:liquibase: Successfully acquired change log lock
INFO 3/3/11 10:05 AM:liquibase: Reading from databasechangelog
INFO 3/3/11 10:05 AM:liquibase: Reading from databasechangelog
INFO 3/3/11 10:05 AM:liquibase: ChangeSet C:/DbSource/Tables/0001_CreateTableEmployee.xml::1::PeterPan ran successfully in 78ms
INFO 3/3/11 10:05 AM:liquibase: ChangeSet C:/DbSource/Tables/0002_CreateSchema-test.xml::2::PeterPan ran successfully in 15ms
INFO 3/3/11 10:05 AM:liquibase: ChangeSet C:/DbSource/Tables/0003_CreateTable-junk.xml::4::PeterPan ran successfully in 31ms
INFO 3/3/11 10:05 AM:liquibase: ChangeSet C:/DbSource/Tables/0004_CreateTable-test.fun_log.xml::4::PeterPan ran successfully in 156ms
INFO 3/3/11 10:05 AM:liquibase: ChangeSet C:/DbSource/Views/001_all_employees.sql::REQ111111::PeterPan ran successfully in 15ms
INFO 3/3/11 10:05 AM:liquibase: ChangeSet C:/DbSource/DML/0001_InsertInto-public.employee.xml::4::PeterPan ran successfully in 16ms
INFO 3/3/11 10:05 AM:liquibase: ChangeSet C:/DbSource/DML/0002_Truncate-public.employee.xml::4::PeterPan ran successfully in 282ms
INFO 3/3/11 10:05 AM:liquibase: ChangeSet C:/DbSource/DML/0003_InsertInto-public.employee.xml::7::PeterPan ran successfully in 16ms
INFO 3/3/11 10:05 AM:liquibase: ChangeSet C:/DbSource/DML/0004_InsertInto-public.employee.xml::7::PeterPan ran successfully in 33298ms
INFO 3/3/11 10:05 AM:liquibase: Successfully released change log lock
Liquibase Update Successful

C:\>liquibase --driver=org.postgresql.Driver --classpath="C:/Program Files/Java/jdk1.6.0_23/lib/postgresql-9.0-801.jdbc4.jar" --url="jdbc:postgresql:/
/localhost:5432/test_db_build" --changeLogFile=C:/DbSource/Common/00_main_changelog.xml --username=postgres --password=password rollbackCount 10
INFO 3/3/11 10:05 AM:liquibase: Successfully acquired change log lock
INFO 3/3/11 10:05 AM:liquibase: Reading from databasechangelog
INFO 3/3/11 10:05 AM:liquibase: Rolling Back Changeset:C:/DbSource/DML/0004_InsertInto-public.employee.xml::7::PeterPan::(Checksum: 3:a4b6d9d43a4175f753
f7c0a457d1ced1)
INFO 3/3/11 10:05 AM:liquibase: Rolling Back Changeset:C:/DbSource/DML/0003_InsertInto-public.employee.xml::7::PeterPan::(Checksum: 3:d7308afe0c1d4c8350
6a1ffed71a226c)
INFO 3/3/11 10:05 AM:liquibase: Rolling Back Changeset:C:/DbSource/DML/0002_Truncate-public.employee.xml::4::PeterPan::(Checksum: 3:0da476ec239364e44dda
d4f6f6da4321)
INFO 3/3/11 10:05 AM:liquibase: Rolling Back Changeset:C:/DbSource/DML/0001_InsertInto-public.employee.xml::4::PeterPan::(Checksum: 3:afdb713d4f13832efd
f0a0313ead4b84)
INFO 3/3/11 10:05 AM:liquibase: Rolling Back Changeset:C:/DbSource/Views/001_all_employees.sql::REQ111111::PeterPan::(Checksum: 3:3aee7ee7499252540b394
acb470a1ae1)
INFO 3/3/11 10:05 AM:liquibase: Successfully released change log lock
Liquibase Update Failed: No inverse to liquibase.change.core.RawSQLChange created
SEVERE 3/3/11 10:05 AM:liquibase: No inverse to liquibase.change.core.RawSQLChange created
liquibase.exception.RollbackFailedException: liquibase.exception.RollbackImpossibleException: No inverse to liquibase.change.core.RawSQLChange created

        at liquibase.changelog.ChangeSet.rollback(ChangeSet.java:401)
        at liquibase.changelog.visitor.RollbackVisitor.visit(RollbackVisitor.java:23)
        at liquibase.changelog.ChangeLogIterator.run(ChangeLogIterator.java:58)
        at liquibase.Liquibase.rollback(Liquibase.java:250)
        at liquibase.integration.commandline.Main.doMigration(Main.java:710)
        at liquibase.integration.commandline.Main.main(Main.java:116)
Caused by: liquibase.exception.RollbackImpossibleException: No inverse to liquibase.change.core.RawSQLChange created
        at liquibase.change.AbstractChange.generateRollbackStatementsFromInverse(AbstractChange.java:145)
        at liquibase.change.AbstractChange.generateRollbackStatements(AbstractChange.java:115)
        at liquibase.database.AbstractDatabase.executeRollbackStatements(AbstractDatabase.java:1029)
        at liquibase.changelog.ChangeSet.rollback(ChangeSet.java:388)
        ... 5 more


For more information, use the --logLevel flag)

C:\>

Answer 1

好的，在我提供的链接上显示了解决这个问题的关键是“将-rollback添加到表示回滚sql的行的开头”。

因此，如果我将上面的脚本更新为

--rollback DROP VIEW all_employees;

或者这种格式也可以。

--rollback DROP 
--rollback VIEW all_employees;

最好有开始注释和结束注释，以允许这种类型的条目。也许就像

--StartRollback
DROP TABLE employee;
DROP TABLE pants;
--End Rollback

这里有一个网站帮助澄清了很多这方面的问题。http://forum.liquibase.org/#topic/49382000000028385