Question

我正在创建一个Grails应用程序，它从现有的遗留数据库中获取数据（无法修改），并且我试图围绕如何在域模型类中表示表关系。

以下是一些示例数据：

Table 1 Columns: pID, FirstName, LastName, MiddleName
Table 1 ID is composite made up of pID and LastName

Table 2 Columns: pID, EmailAddress, PhoneNumber, FaxNumber
Table 1 ID is composite made up of pID, EmailAddress, PhoneNumber

Table 3 Columns: pID, Occupation
Table 3 ID is just pID

我如何用域模型类表示这三个表及其关系（通过pID列）？

Answer 1

class Table3{
  String id, occupation
}

class User implements Serializable{
  Table3 pID
  String firstName, lastName, middleName
  static mapping = {
        // need name maping: 
        id composite: ['pID', 'lastName']
    }
  //!!!Add equals and hashCode
}
class Profile implements Serializable{
  Table3 pID  
  String emailAddress, phoneNumber, faxNumber
  static mapping = {
        // need name maping: 
        id composite: ['pID', 'emailAddress', 'phoneNumber']
    }
  //!!!Add equals and hashCode
}

Answer 2

本教程提供关系指导： http://grails-plugins.github.io/grails-db-reverse-engineer/docs/manual/guide/4%20Tutorial.html

6. Configure the reverse engineering process.

Add these configuration options to grails-app/conf/Config.groovy:

grails.plugin.reveng.packageName = 'com.revengtest'
grails.plugin.reveng.versionColumns = [other: 'nonstandard_version_name']
grails.plugin.reveng.manyToManyTables = ['user_role']
grails.plugin.reveng.manyToManyBelongsTos = ['user_role': 'role', 'author_books': 'book']

Grails：基于遗留数据库的域模型关系

2 个答案: