Grails db-migration插件

Question

我试图改变我的数据库模型，所以我跟着this教程。顺便说一句我正在使用Grails 1.3.7。

我跑：

grails install-plugin database-migration 

它安装罚款！

但是，当我跑：

dbm-generate-gorm-changelog changelog.groovy 

它给了我下面的错误：

java.io.FileNotFoundException: grails-app\migrations\changelog.groovy (The system cannot find the path specified) 
at java.io.FileOutputStream.open(Native Method) 
at java.io.FileOutputStream.<init>(FileOutputStream.java:212) 
at java.io.FileOutputStream.<init>(FileOutputStream.java:165) 
at java.io.FileWriter.<init>(FileWriter.java:90) 
at _DatabaseMigrationCommon_groovy$_run_closure7.doCall(_DatabaseMigrationCommon_groovy:128) 
at _DatabaseMigrationCommon_groovy$_run_closure7.call(_DatabaseMigrationCommon_groovy) 
at DbmGenerateGormChangelog$_run_closure1_closure2.doCall(DbmGenerateGormChangelog:28) 
at DbmGenerateGormChangelog$_run_closure1_closure2.doCall(DbmGenerateGormChangelog) 
at _DatabaseMigrationCommon_groovy$_run_closure6_closure18.doCall(_DatabaseMigrationCommon_groovy:88) 
at _DatabaseMigrationCommon_groovy$_run_closure6_closure18.doCall(_DatabaseMigrationCommon_groovy) 
at grails.plugin.databasemigration.MigrationUtils.executeInSession(MigrationUtils.groovy:99) 
at grails.plugin.databasemigration.MigrationUtils$executeInSession.call(Unknown Source) 
at _DatabaseMigrationCommon_groovy$_run_closure6.doCall(_DatabaseMigrationCommon_groovy:81) 
at _DatabaseMigrationCommon_groovy$_run_closure6.call(_DatabaseMigrationCommon_groovy) 
at DbmGenerateGormChangelog$_run_closure1.doCall(DbmGenerateGormChangelog:27) 
at gant.Gant$_dispatch_closure5.doCall(Gant.groovy:381) 
at gant.Gant$_dispatch_closure7.doCall(Gant.groovy:415) 
at gant.Gant$_dispatch_closure7.doCall(Gant.groovy) 
at gant.Gant.withBuildListeners(Gant.groovy:427) 
at gant.Gant.this$2$withBuildListeners(Gant.groovy) 
at gant.Gant$this$2$withBuildListeners.callCurrent(Unknown Source) 
at gant.Gant.dispatch(Gant.groovy:415) 
at gant.Gant.this$2$dispatch(Gant.groovy) 
at gant.Gant.invokeMethod(Gant.groovy) 
at gant.Gant.executeTargets(Gant.groovy:590) 
at gant.Gant.executeTargets(Gant.groovy:589) 

Answer 1

你可能会缺少 “--add”：

dbm-generate-gorm-changelog --add changelog.groovy 

一个优秀grails数据库迁移的入口点（grails团队）：http://blog.springsource.org/2011/08/17/countdown-to-grails-2-0-database-migrations/