Liquibase更新错误

Question

我正在尝试使用Liquibase在数据库中创建一些表.

一些背景知识:我在本地h2数据库上执行了相同的changelog.xml文件,并且工作得很顺利.我用squirrel测试了下面的oracle数据库,用户名,密码和驱动程序,并成功连接.所以我很确定我正面临一个liquibase问题.我做了大量的谷歌搜索,并没有在SO或其他任何可以帮助我的地方找到任何东西.

我在命令提示符下输入以下内容:

C:\>java -jar liquibase-core-2.0.5.jar --driver=oracle.jdbc.OracleDriver
--classpath=ojdbc6-11.2.0.3.0.jar --changeLogFile=changelog.xml 
--url="jdbc:oracle:thin:@myDatabase"
--username=myUsername --password=myPassword --logLevel=debug update

返回的是:

DEBUG 9/30/13 3:09 PM:liquibase: Unable to load/access Apache Derby driver class
to check version
DEBUG 9/30/13 3:09 PM:liquibase: Connected to myUsername@jdbc:oracle:thin:@myDatabase
DEBUG 9/30/13 3:10 PM:liquibase: Executing QUERY database command: SELECT LOCKED
FROM DATABASECHANGELOGLOCK WHERE ID=1 FOR UPDATE
Liquibase Update Failed: Empty result set, expected one row
SEVERE 9/30/13 3:10 PM:liquibase: Empty result set, expected one row
liquibase.exception.LockException: liquibase.exception.DatabaseException: Empty
result set, expected one row
    at liquibase.lockservice.LockService.acquireLock(LockService.java:121)
    at liquibase.lockservice.LockService.waitForLock(LockService.java:61)
    at liquibase.Liquibase.update(Liquibase.java:102)
    at liquibase.integration.commandline.Main.doMigration(Main.java:825)
    at liquibase.integration.commandline.Main.main(Main.java:134)
Caused by: liquibase.exception.DatabaseException: Empty result set, expected one
row
    at liquibase.util.JdbcUtils.requiredSingleResult(JdbcUtils.java:124)
    at liquibase.executor.jvm.JdbcExecutor.queryForObject(JdbcExecutor.java:
159)
    at liquibase.executor.jvm.JdbcExecutor.queryForObject(JdbcExecutor.java:
167)
    at liquibase.executor.jvm.JdbcExecutor.queryForObject(JdbcExecutor.java:
163)
    at liquibase.lockservice.LockService.acquireLock(LockService.java:96)
    ... 4 more

Answer 1

我在这里找到答案:http://forum.liquibase.org/topic/message-regarding-an-empty-result-set-for-databasechangeloglock

删除databasechangeloglock表为我解决了这个问题.

Answer 2

如果您的DATABASECHANGELOGLOCK为空,则始终显示错误.(我在意外删除此表的记录后遇到此问题).

我发现的解决方案很简单:

只需插入ID为1的虚拟行,LOCKED = 0,LOCKGRANTED = null,LOCKEDBY = null

而已!