在grails中更新域类

Question

I want to add new fields to a domain class so that it updates the generated table's attributes set. I have a domain class like this,,

Class Book {
String name
  static constraints = {
   name nullable:false
  }

 String toString() {
        return name
 }
}

The GORM generated includes name along with id and version. Now I want to add ISBN to Book domain class as following

 Class Book {
    String name
    String ISBN
      static constraints = {
       name nullable:false
       ISBN nullable:true
      }

     String toString() {
            return name
     }
    }

I don't want to use create-drop in DataSource.groovy because it will delete all my previous data. My DataSource.groovy looks like this,,

 dataSource {
         dbCreate = "update"
         url = "jdbc:jtds:sqlserver://localhost:1433/databaseName"
         username = "username"
         password = "password"
  }

I want GORM to add ISBN field to book table. But its not happening. Where am I wrong ?

I am using sql server 2008 and grails version 2.1.1

Answer 1

dataSource {
     dbCreate = "update"
}

should do the trick. It updates you db without dropping the tables

Answer 2

you will need to crate this field in sql server by hand it use to be a easy task in sqlserver because all its tools, and you should take a look to grails database migration plugin documentation. It should be already installed in your grails version