Grails：在常规的groovy类中获取数据源

问题描述

限时删除！！

如何从常规groovy类中访问数据源？注入不会像服务一样工作。

原因是我需要做一些手动数据库调用（即：使用groovy.sql的SQL语句.Sql类）从groovy类开始，因为我正在使用旧数据库。

解决方案

 通过将 dataSource  bean明确地指向POGO类> // resources.groovy 
 beans = {
 myPogo（MyPogo）{
 dataSource = ref（'dataSource'）
} 
} 
 
 //MyPogo.groovy 
 MyPogo {
 def dataSource 
 .... 
} 
  

这是一项昂贵的操作。如果您已经在POGO中访问 applicationContext 或 grailsApplication ，那么您不需要像上面提到的那样创建一个bean。

dataSource bean可以直接从上下文中获取为：

  // ctx是ApplicationContext 
 def dataSource = ctx.getBean（'dataSource'）
 
 //或者如果grailsApplication可用
 def dataSource = grailsApplication.mainContext.getBean（'dataSource'）
  

如果您正在调用POGO Grails工件的类方法然后使用下面的方法而不是所有上述方法。例如：

$ p $ //服务类
class MyService {
def dataSource // autowired

def serviceMethod（）{
MyPogo pogo = new MyPogo（）
pogo.dataSource = dataSource // set dataSource in POGO
}
}

How can I get access to the data source from within a normal groovy class? Injection doesn't work like it does with services.

The reason for this is that I need to do some manual database calls (ie: SQL statements using the groovy.sql.Sql class) from the groovy class since I'm working with a legacy database.

解决方案

dataSource is a bean which gets auto injected in services when used. All beans are auto wired in grails artifacts (controllers, services etc) by default. In your case you are using a POGO and I suppose it would be inside src/groovy.

You can inject the dataSource bean explicitly to POGO class by making it a bean by itself

//resources.groovy
beans = {
    myPogo(MyPogo){
        dataSource = ref('dataSource')
    }
}

//MyPogo.groovy
MyPogo {
    def dataSource
    ....
}

This is an expensive operation. If you already are accessing applicationContext or grailsApplication in POGO then you need not create a bean as mentioned above.

dataSource bean can be directly fetched from the context as:

//ctx being ApplicationContext
def dataSource = ctx.getBean('dataSource')

//or if grailsApplication is available
def dataSource = grailsApplication.mainContext.getBean('dataSource')

If you are invoking the POGO class methods from a grails artifact then use below approach than all of the above approaches. For example:

//service class
class MyService {
   def dataSource //autowired

   def serviceMethod(){
       MyPogo pogo = new MyPogo()
       pogo.dataSource = dataSource //set dataSource in POGO
   }
}

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