apdx-code_listings.lyx at 682880f7b00b7bffa7ba496bca529ef417335a79 from tjweir's liftbook

tjweir / liftbook

116

Description:	Book for liftweb: http://www.apress.com/book/view/1430224215 edit
Homepage:	http://groups.google.com/group/the-lift-book edit
Public Clone URL:	git://github.com/tjweir/liftbook.git Give this clone URL to anyone. `git clone git://github.com/tjweir/liftbook.git`
Your Clone URL:	git@github.com:tjweir/liftbook.git Use this clone URL yourself. `git clone git@github.com:tjweir/liftbook.git`

Fixed some minor errors per Kris Nuttycombe

Derek Chen-Becker (author)

Tue Jun 09 14:14:12 -0700 2009

commit 682880f7b00b7bffa7ba496bca529ef417335a79
tree f8b63d0c28b748f712077fe65a8ad5c4bbad60e7
parent 61faa993eacedc99b3d35f7ac6a6904774110767

liftbook / apdx-code_listings.lyx

100644 1146 lines (696 sloc) 16.326 kb

raw blame history

#LyX 1.6.1 created this file. For more info see http://www.lyx.org/
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\secnumdepth 3
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\paperpagestyle default
\tracking_changes false
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\author "" 
\author "" 
\end_header
 
\begin_body
 
\begin_layout Chapter
JPA Code Listings
\begin_inset CommandInset label
LatexCommand label
name "cha:Code-Listings"
 
\end_inset
 
 
\end_layout
 
\begin_layout Standard
To conserve space and preserve flow in the main text, we've placed full
 code listings for the JPA chapter in this appendix.
\end_layout
 
\begin_layout Section
JPA Library Demo
\end_layout
 
\begin_layout Standard
The full library demo is available under the main Lift Git repository at
 
\begin_inset Flex URL
status collapsed
 
\begin_layout Plain Layout
 
http://github.com/dpp/liftweb/tree/master
\end_layout
 
\end_inset
 
.
 To illustrate some points, we've included selected listings from the project.
\end_layout
 
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\end_layout
 
\begin_layout Subsection
Author Entity
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Author.scala
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package com.foo.jpaweb.model
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\end_layout
 
\begin_layout Plain Layout
 
import javax.persistence._
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\begin_layout Plain Layout
 
\end_layout
 
\begin_layout Plain Layout
 
/**
\end_layout
 
\begin_layout Plain Layout
 
  An author is someone who writes books.
\end_layout
 
\begin_layout Plain Layout
 
*/
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\begin_layout Plain Layout
 
@Entity
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\begin_layout Plain Layout
 
class Author {
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  @Id
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  var id : Long = _
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\begin_layout Plain Layout
 
  @Column{val unique = true, val nullable = false}
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\begin_layout Plain Layout
 
  var name : String = ""
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\begin_layout Plain Layout
 
\end_layout
 
\begin_layout Plain Layout
 
  @OneToMany(){val mappedBy = "author", val targetEntity = classOf[Book],
 
\end_layout
 
\begin_layout Plain Layout
 
               val cascade = Array(CascadeType.REMOVE)}
\end_layout
 
\begin_layout Plain Layout
 
  var books : java.util.Set[Book] = new java.util.HashSet[Book]()
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}
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\end_layout
 
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orm.xml
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orm.xml
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 Mapping
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orm.xml
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<entity-mappings xmlns="http://java.sun.com/xml/ns/persistence/orm"
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    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence/orm
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        http://java.sun.com/xml/ns/persistence/orm_1_0.xsd" version="1.0">
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\begin_layout Plain Layout
 
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\begin_layout Plain Layout
 
  <package>com.foo.jpaweb.model</package>
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  <entity class="Book">
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\begin_layout Plain Layout
 
    <named-query name="findBooksByAuthor">
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\begin_layout Plain Layout
 
      <query><![CDATA[from Book b where b.author.id = :id order by b.title]]></quer
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    </named-query>
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\begin_layout Plain Layout
 
    <named-query name="findBooksByDate">
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      <query><![CDATA[from Book b where b.published between :startDate and
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    <named-query name="findBooksByTitle">
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      <query><![CDATA[from Book b where lower(b.title) like :title order
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    </named-query>
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    <named-query name="findAllBooks">
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      <query><![CDATA[from Book b order by b.title]]></query>
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  </entity>
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  <entity class="Author">
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    <named-query name="findAllAuthors">
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      <query><![CDATA[from Author a order by a.name]]></query>
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  </entity>
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\end_layout
 
\begin_layout Subsection
Enumv Trait
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\begin_layout Standard
\begin_inset listings
lstparams "basicstyle={\scriptsize},breaklines=true,firstline=5,numbers=left,numberstyle={\tiny}"
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Enumv Trait
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package com.foo.jpaweb.model
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\begin_layout Plain Layout
 
\end_layout
 
\begin_layout Plain Layout
 
/* adds a valueOf function, assumes name is defined
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\begin_layout Plain Layout
 
add optional description */
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\begin_layout Plain Layout
 
trait Enumv  {
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\begin_layout Plain Layout
 
  
\end_layout
 
\begin_layout Plain Layout
 
  this: Enumeration =>
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\begin_layout Plain Layout
 
\end_layout
 
\begin_layout Plain Layout
 
  private var nameDescriptionMap = scala.collection.mutable.Map[String, String]()
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\begin_layout Plain Layout
 
\end_layout
 
\begin_layout Plain Layout
 
  /* store a name and description for forms */
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\begin_layout Plain Layout
 
  def Value(name: String, desc: String) : Value = {
\end_layout
 
\begin_layout Plain Layout
 
    nameDescriptionMap += (name -> desc)
\end_layout
 
\begin_layout Plain Layout
 
    new Val(name)
\end_layout
 
\begin_layout Plain Layout
 
  }
\end_layout
 
\begin_layout Plain Layout
 
  
\end_layout
 
\begin_layout Plain Layout
 
    /* get description if it exists else name */
\end_layout
 
\begin_layout Plain Layout
 
  def getDescriptionOrName(ev: this.Value) = {
\end_layout
 
\begin_layout Plain Layout
 
    try {
\end_layout
 
\begin_layout Plain Layout
 
      nameDescriptionMap(""+ev)
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\begin_layout Plain Layout
 
    } catch {
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\begin_layout Plain Layout
 
      case e: NoSuchElementException => ev.toString
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\begin_layout Plain Layout
 
    }
\end_layout
 
\begin_layout Plain Layout
 
  }
\end_layout
 
\begin_layout Plain Layout
 
\end_layout
 
\begin_layout Plain Layout
 
  /* get name description pair list for forms */
\end_layout
 
\begin_layout Plain Layout
 
  def getNameDescriptionList =  this.elements.toList.map(v => (v.toString, getDescri
ptionOrName(v) ) ).toList
\end_layout
 
\begin_layout Plain Layout
 
\end_layout
 
\begin_layout Plain Layout
 
  /* get the enum given a string */
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\begin_layout Plain Layout
 
  def valueOf(str: String) = this.elements.toList.filter(_.toString == str)
 match {
\end_layout
 
\begin_layout Plain Layout
 
    case Nil => null
\end_layout
 
\begin_layout Plain Layout
 
    case x => x.head
\end_layout
 
\begin_layout Plain Layout
 
  }
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\begin_layout Plain Layout
 
}
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\end_layout
 
\begin_layout Standard
\begin_inset Newpage clearpage
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\end_layout
 
\begin_layout Subsection
EnumerationType
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\begin_layout Standard
\begin_inset listings
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LatexCommand label
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EnumvType class
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package com.foo.jpaweb.model
\end_layout
 
\begin_layout Plain Layout
 
\end_layout
 
\begin_layout Plain Layout
 
import java.io.Serializable
\end_layout
 
\begin_layout Plain Layout
 
import java.sql.PreparedStatement
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\begin_layout Plain Layout
 
import java.sql.ResultSet
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\begin_layout Plain Layout
 
import java.sql.SQLException
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import java.sql.Types
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\begin_layout Plain Layout
 
\end_layout
 
\begin_layout Plain Layout
 
import org.hibernate.HibernateException
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\begin_layout Plain Layout
 
import org.hibernate.usertype.UserType
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\end_layout
 
\begin_layout Plain Layout
 
/**
\end_layout
 
\begin_layout Plain Layout
 
 * Helper class to translate enum for hibernate
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\begin_layout Plain Layout
 
 */
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abstract class EnumvType(val et: Enumeration with Enumv) extends UserType
 {
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\begin_layout Plain Layout
 
  
\end_layout
 
\begin_layout Plain Layout
 
  val SQL_TYPES = Array({Types.VARCHAR})
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\begin_layout Plain Layout
 
  override def sqlTypes() = SQL_TYPES
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  override def returnedClass = classOf[et.Value]
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  override def equals(x: Object, y: Object): Boolean = {
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    return x == y
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\begin_layout Plain Layout
 
  }
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  override def hashCode(x: Object) = x.hashCode
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  override def nullSafeGet(resultSet: ResultSet, names: Array[String], owner:
 Object): Object = {
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\begin_layout Plain Layout
 
    val value = resultSet.getString(names(0))
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\begin_layout Plain Layout
 
    if (resultSet.wasNull()) return null
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\begin_layout Plain Layout
 
    else {
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\begin_layout Plain Layout
 
      return et.valueOf(value)
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\begin_layout Plain Layout
 
    }
\end_layout
 
\begin_layout Plain Layout
 
  }
\end_layout
 
\begin_layout Plain Layout
 
  
\end_layout
 
\begin_layout Plain Layout
 
  override def nullSafeSet(statement: PreparedStatement, value: Object,
 index: Int): Unit = {
\end_layout
 
\begin_layout Plain Layout
 
    if (value == null) {
\end_layout
 
\begin_layout Plain Layout
 
      statement.setNull(index, Types.VARCHAR)
\end_layout
 
\begin_layout Plain Layout
 
    } else {
\end_layout
 
\begin_layout Plain Layout
 
      val en = value.toString
\end_layout
 
\begin_layout Plain Layout
 
      statement.setString(index, en)
\end_layout
 
\begin_layout Plain Layout
 
    }
\end_layout
 
\begin_layout Plain Layout
 
  }
\end_layout
 
\begin_layout Plain Layout
 
\end_layout
 
\begin_layout Plain Layout
 
  override def deepCopy(value: Object): Object = value
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\begin_layout Plain Layout
 
\end_layout
 
\begin_layout Plain Layout
 
  override def isMutable() = false
\end_layout
 
\begin_layout Plain Layout
 
    
\end_layout
 
\begin_layout Plain Layout
 
  override def disassemble(value: Object) = value.asInstanceOf[Serializable]
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\begin_layout Plain Layout
 
\end_layout
 
\begin_layout Plain Layout
 
  override def assemble(cached: Serializable, owner: Object): Serializable
 = cached
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\begin_layout Plain Layout
 
\end_layout
 
\begin_layout Plain Layout
 
  override def replace(original: Object, target: Object, owner: Object)
 = original
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\begin_layout Plain Layout
 
\end_layout
 
\begin_layout Plain Layout
 
}
\end_layout
 
\end_inset
 
 
\end_layout
 
\begin_layout Standard
\begin_inset Newpage clearpage
\end_inset
 
 
\end_layout
 
\begin_layout Subsection
JPA web.xml
\begin_inset Index
status collapsed
 
\begin_layout Plain Layout
web.xml
\end_layout
 
\end_inset
 
 
\end_layout
 
\begin_layout Standard
This shows the LiftFilter setup as well as the persistence-context-ref.
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\begin_layout Standard
\begin_inset listings
inline false
status open
 
\begin_layout Plain Layout
 
\begin_inset Caption
 
\begin_layout Plain Layout
\begin_inset CommandInset label
LatexCommand label
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\end_inset
 
JPA web.xml
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\end_inset
 
 
\end_layout
 
\begin_layout Plain Layout
 
<?xml version="1.0" encoding="ISO-8859-1"?>
\end_layout
 
\begin_layout Plain Layout
 
\end_layout
 
\begin_layout Plain Layout
 
<!DOCTYPE web-app
\end_layout
 
\begin_layout Plain Layout
 
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
\end_layout
 
\begin_layout Plain Layout
 
"http://java.sun.com/j2ee/dtds/web-app_2_3.dtd">
\end_layout
 
\begin_layout Plain Layout
 
\end_layout
 
\begin_layout Plain Layout
 
<web-app>
\end_layout
 
\begin_layout Plain Layout
 
<filter>
\end_layout
 
\begin_layout Plain Layout
 
  <filter-name>LiftFilter</filter-name>
\end_layout
 
\begin_layout Plain Layout
 
  <display-name>Lift Filter</display-name>
\end_layout
 
\begin_layout Plain Layout
 
  <description>The Filter that intercepts lift calls</description>
\end_layout
 
\begin_layout Plain Layout
 
  <filter-class>net.liftweb.http.LiftFilter</filter-class>
\end_layout
 
\begin_layout Plain Layout
 
  <persistence-context-ref>
\end_layout
 
\begin_layout Plain Layout
 
    <description>
\end_layout
 
\begin_layout Plain Layout
 
      Persistence context for the library app
\end_layout
 
\begin_layout Plain Layout
 
    </description>
\end_layout
 
\begin_layout Plain Layout
 
    <persistence-context-ref-name>
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\begin_layout Plain Layout
 
      persistence/jpaweb
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\begin_layout Plain Layout
 
    </persistence-context-ref-name>
\end_layout
 
\begin_layout Plain Layout
 
    <persistence-unit-name>
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\begin_layout Plain Layout
 
      jpaweb
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\begin_layout Plain Layout
 
    </persistence-unit-name>
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\begin_layout Plain Layout
 
  </persistence-context-ref>
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\begin_layout Plain Layout
 
</filter>
\end_layout
 
\begin_layout Plain Layout
 
        
\end_layout
 
\begin_layout Plain Layout
 
\end_layout
 
\begin_layout Plain Layout
 
<filter-mapping>
\end_layout
 
\begin_layout Plain Layout
 
  <filter-name>LiftFilter</filter-name>
\end_layout
 
\begin_layout Plain Layout
 
  <url-pattern>/*</url-pattern>
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\begin_layout Plain Layout
 
</filter-mapping>
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\begin_layout Plain Layout
 
\end_layout
 
\begin_layout Plain Layout
 
</web-app>
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\begin_layout Plain Layout
 
\end_layout
 
\end_inset
 
 
\end_layout
 
\end_body
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