scala lift环境搭建(4)

末蓝、 2022-06-13 10:08 210阅读 0赞

接下来我们更新一下boot.scala.在其中添加以下代码

val sitemap=List(
          Menu("Home")/"index",
          Menu("Auctions")/"auctions"
        )
        LiftRules.setSiteMap(SiteMap(sitemap:_*))

然后我们加入数据库连接所必要的代码

在Project.scala中，添加

val mapper    = "net.liftweb" %% "lift-mapper" % liftVersion
    val textile   = "net.liftweb" %% "lift-textile" % liftVersion % "compile->default"

然后对项目执行

reload
    update

耐心等待mapper包下载安装

在boot中添加以下引用

import net.liftweb.util._
    import net.liftweb.util.Helpers._

导入mapper需要的模块

import net.liftweb.mapper.{DB,Schemifier,DefaultConnectionIdentifier,StandardDBVendor,MapperRules}

引入数据库

// set the JNDI name that we'll be using
        DefaultConnectionIdentifier.jndiName = "jdbc/liftinaction"
    
        // handle JNDI not being avalible
        if (!DB.jndiJdbcConnAvailable_?){
          //logger.warn("No JNDI configured - making a direct application connection")
          DB.defineConnectionManager(DefaultConnectionIdentifier, Database)
          // make sure cyote unloads database connections before shutting down
          LiftRules.unloadHooks.append(() => Database.closeAllConnections_!())
        }
    
        // automatically create the tables
        Schemifier.schemify(true,Schemifier.infoF _,Supplier,Book,Author,AuthorBooks,Publisher)
    
        // setup the load pattern
        S.addAround(DB.buildLoanWrapper)

其中Supplier,Book,Author,AuthorBooks,Publisher是我们接下来要建立的实体对象

增加一个数据库声明，如果本地不存在，则会建立一个临时的h2数据库

object Database extends StandardDBVendor(
        Props.get("db.class").openOr("org.h2.Driver"),
        Props.get("db.url").openOr("jdbc:h2:database/temp"),
        Props.get("db.user"),
        Props.get("db.pass"))

使用

>lift create mapper XXX

来建立上述实体对象

class Book extends LongKeyedMapper[Book]
        with IdPK
        with CreatedUpdated
        with ManyToMany {
    
      def getSingleton = Book
    
      object title extends MappedString(this,255)
      object blurb extends MappedText(this)
      object publishedOn extends MappedDate(this)
    
      object publisher extends  LongMappedMapper(this,Publisher)
      object authors extends  MappedManyToMany(
        AuthorBooks,AuthorBooks.book,AuthorBooks.author,Author
      )
    
    
    
    }
    object Book extends Book with LongKeyedMetaMapper[Book] {
      override def dbTableName="books"
    }

class AuthorBooks extends LongKeyedMapper[AuthorBooks] with IdPK {
    
      def getSingleton = AuthorBooks
      object author extends LongMappedMapper(this,Author)
      object book extends  LongMappedMapper(this,Book)
    
    
    
    }
    object AuthorBooks extends AuthorBooks with LongKeyedMetaMapper[AuthorBooks]
    
     class Publisher extends LongKeyedMapper[Publisher]
      with IdPK
      with CreatedUpdated 
      with OneToMany[Long,Publisher]{
    
      def getSingleton = Publisher
      object name extends MappedString(this,255)
      object description extends MappedText(this)
    
      object books extends  MappedOneToMany(Book,Book.publisher)
    
    
    
    }
    object Publisher extends Publisher with LongKeyedMetaMapper[Publisher]  {
    
      override def dbTableName =  "publishers"
    }
    
     class Author extends LongKeyedMapper[Author]
        with IdPK
        with CreatedUpdated
        with ManyToMany {
    
      def getSingleton = Author
      object title extends MappedEnum(this,Titles)
      object firstName extends MappedString(this,255)
      object lastName extends MappedText(this)
      object email extends MappedEmail(this,150)
      
      object books extends  MappedManyToMany(
        AuthorBooks,AuthorBooks.author,
        AuthorBooks.book,Book
      )
    
    
    
    }
    object Author extends Author with LongKeyedMetaMapper[Author]  {
      override def dbTableName="authors"
    }
    object Titles extends Enumeration{
      val Mr,Mrs,Miss,Dr = Value
    }