[hibernate-commits] Hibernate SVN: r20147 - in core/trunk/documentation/quickstart/src/main/docbook/en-US/content: extras and 1 other directory.

Author: misty(a)redhat.com Date: 2010-08-15 19:30:03 -0400 (Sun, 15 Aug 2010) New Revision: 20147 Added: core/trunk/documentation/quickstart/src/main/docbook/en-US/content/extras/ core/trunk/documentation/quickstart/src/main/docbook/en-US/content/extras/example-pom.xml Modified: core/trunk/documentation/quickstart/src/main/docbook/en-US/content/tutorial_native.xml Log: Line edits regarding HHH-5441 Added: core/trunk/documentation/quickstart/src/main/docbook/en-US/content/extras/example-pom.xml =================================================================== --- core/trunk/documentation/quickstart/src/main/docbook/en-US/content/extras/example-pom.xml (rev 0) +++ core/trunk/documentation/quickstart/src/main/docbook/en-US/content/extras/example-pom.xml 2010-08-15 23:30:03 UTC (rev 20147) @@ -0,0 +1,48 @@ +<project xmlns="http://maven.apache.org/POM/4.0.0" +xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" +xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> + +<modelVersion>4.0.0</modelVersion> + +<groupId>org.hibernate.tutorials</groupId> +<artifactId>hibernate-tutorial-native</artifactId> +<version>1.0.0-SNAPSHOT</version> +<name>Hibernate Native Tutorial</name> + +<build> + <!-- we dont want the version to be part of the generated war file name --> + <finalName>${artifactId}</finalName> +</build> + +<dependencies> + <dependency> + <groupId>org.hibernate</groupId> + <artifactId>hibernate-core</artifactId> + </dependency> + + <!-- Because this is a web app, we also have a dependency on the servlet api. --> + <dependency> + <groupId>javax.servlet</groupId> + <artifactId>servlet-api</artifactId> + </dependency> + + <!-- Hibernate uses slf4j for logging, for our purposes here use the simple backend --> + <dependency> + <groupId>org.slf4j</groupId> + <artifactId>slf4j-simple</artifactId> + </dependency> + + <!-- Hibernate gives you a choice of bytecode providers between cglib and javassist --> + <dependency> + <groupId>javassist</groupId> + <artifactId>javassist</artifactId> + </dependency> + + <!-- The tutorial uses the H2 in-memory database --> + <dependency> + <groupId>com.h2database</groupId> + <artifactId>h2</artifactId> + </dependency> +</dependencies> + +</project> \ No newline at end of file Modified: core/trunk/documentation/quickstart/src/main/docbook/en-US/content/tutorial_native.xml =================================================================== --- core/trunk/documentation/quickstart/src/main/docbook/en-US/content/tutorial_native.xml 2010-08-15 15:51:53 UTC (rev 20146) +++ core/trunk/documentation/quickstart/src/main/docbook/en-US/content/tutorial_native.xml 2010-08-15 23:30:03 UTC (rev 20147) @@ -6,18 +6,18 @@ <note> <para> - This tutorial will use the "standard layout" advocated by many build tools and best practices. - <ulink url="http://maven.apache.org/guides/introduction/introduction-to-the... - provides a good description of the "standard layout" if you are unfamiliar. + This tutorial uses the <phrase>standard layout</phrase> described in + <ulink + url="http://maven.apache.org/guides/introduction/introduction-to-the...;. </para> </note> <tip> <para> - The tutorials in this guide utilize Maven, taking advantage of its transitive dependency management - capabilities as well as the ability of many IDEs to automatically set up a project based on the Maven - descriptor. Just be aware that it is not a requirement to use Maven as your build tool in order to use - Hibernate. + The tutorials in this guide use Maven, which includes superior + transitive dependency management capabilities and is easy to use + with many integrated development environments (IDEs). You can use + another build tool, adapting the examples to fit your needs. </para> </tip> @@ -27,59 +27,13 @@ <step id="hibernate-gsg-tutorial-native-pom"> <title>Create the Maven POM file</title> <para> - Create a file named <filename>pom.xml</filename> in the root of your project directory with the - following contents + Create a file named <filename>pom.xml</filename> in the root of + your project directory, containing the the text in <xref + linkend="hibernate-gsg-tutorial-native-pom-ex1" />. </para> <example id="hibernate-gsg-tutorial-native-pom-ex1"> <title><filename>pom.xml</filename></title> - <programlisting role="XML"><![CDATA[<project xmlns="http://maven.apache.org/POM/4.0.0" - xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" - xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> - - <modelVersion>4.0.0</modelVersion> - - <groupId>org.hibernate.tutorials</groupId> - <artifactId>hibernate-tutorial-native</artifactId> - <version>1.0.0-SNAPSHOT</version> - <name>Hibernate Native Tutorial</name> - - <build> - <!-- we dont want the version to be part of the generated war file name --> - <finalName>${artifactId}</finalName> - </build> - - <dependencies> - <dependency> - <groupId>org.hibernate</groupId> - <artifactId>hibernate-core</artifactId> - </dependency> - - <!-- Because this is a web app, we also have a dependency on the servlet api. --> - <dependency> - <groupId>javax.servlet</groupId> - <artifactId>servlet-api</artifactId> - </dependency> - - <!-- Hibernate uses slf4j for logging, for our purposes here use the simple backend --> - <dependency> - <groupId>org.slf4j</groupId> - <artifactId>slf4j-simple</artifactId> - </dependency> - - <!-- Hibernate gives you a choice of bytecode providers between cglib and javassist --> - <dependency> - <groupId>javassist</groupId> - <artifactId>javassist</artifactId> - </dependency> - - <!-- The tutorial uses the H2 in-memory database --> - <dependency> - <groupId>com.h2database</groupId> - <artifactId>h2</artifactId> - </dependency> - </dependencies> - -</project>]]></programlisting> + <programlisting role="XML"><xi:include href="extras/example-pom.xml" xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" /></programlisting> </example> </step> @@ -87,68 +41,36 @@ <title>Create the entity Java class</title> <para> - Create a file named <filename>src/main/java/org/hibernate/tutorial/native/Event.java</filename> - with the following contents: + Create a file named <filename>src/main/java/org/hibernate/tutorial/native/Event.java</filename>, containing the text in <xref linkend="hibernate-gsg-tutorial-native-entity-ex1" />. </para> <example id="hibernate-gsg-tutorial-native-entity-ex1"> <title><filename>Entity.java</filename></title> - <programlisting role="JAVA"><![CDATA[package org.hibernate.tutorial.native; - - import java.util.Date; - - public class Event { - private Long id; - - private String title; - private Date date; - - public Event() {} - - public Long getId() { - return id; - } - - private void setId(Long id) { - this.id = id; - } - - public Date getDate() { - return date; - } - - public void setDate(Date date) { - this.date = date; - } - - public String getTitle() { - return title; - } - - public void setTitle(String title) { - this.title = title; - } - }]]></programlisting> + <programlisting role="JAVA"><xi:include href="extras/example-entity.java" xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" /></programlisting> </example> <para> <!-- todo : what's the best way to refer to content in other books? --> <!-- like here it would be nice to say something like: --> <!-- "Entity class requirements are covered in detail in <x.y.z Some Developer Guide Chapter/Section>" --> - A few things to notice about the entity <itemizedlist> + <title>Notes About the Entity</title> <listitem> <para> - This class uses standard JavaBean naming conventions for property getter and setter - methods, as well as private visibility for the fields. Although this is the - recommended design, it is not required. + This class uses standard JavaBean naming conventions + for property getter and setter methods, as well as + private visibility for the fields. Although this is + the recommended design, it is not required. </para> </listitem> <listitem> <para> - The no-argument constructor (also a JavaBean convention) is a requirement for all - persistent classes. Hibernate has to create objects for you, using Java Reflection. The - constructor could be private, however package or public visibility is required for runtime - proxy generation and efficient data retrieval without bytecode instrumentation. + The no-argument constructor, which is also a JavaBean + convention, is a requirement for all persistent + classes. Hibernate needs to create objects for you, + using Java Reflection. The constructor can be + private. However, package or public visibility is + required for runtime proxy generation and efficient + data retrieval without bytecode instrumentation. </para> </listitem> </itemizedlist> @@ -159,107 +81,118 @@ <title>Create the entity mapping file</title> <para> - Create a file named <filename>src/main/resources/org/hibernate/tutorial/native/Event.hbm.xml</filename> - with the following contents: + Create a file named <filename>src/main/resources/org/hibernate/tutorial/native/Event.hbm.xml</filename>, with the contents in <xref linkend="example-Event.hbm.xml" />. </para> <example> <title><filename>Event.hbm.xml</filename></title> - <programlisting role="XML"><![CDATA[ -<hibernate-mapping package="org.hibernate.tutorial.native"> - - <class name="Event" table="EVENTS"> - <id name="id" column="EVENT_ID"> - <generator class="enhanced-sequence"/> - </id> - <property name="date" type="timestamp" column="EVENT_DATE"/> - <property name="title"/> - </class> - -</hibernate-mapping>]]></programlisting> + <programlisting role="XML"><xi:include href="extras/example-Event.hbm.xml" xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" /></programlisting> </example> <para> - Hibernate needs to know how to load and store objects of the persistent class. This is where the - "mapping metadata" comes into play. The Hibernate mapping file is one choice for providing Hibernate - with this metadata. + Hibernate uses the mapping metadata to find out how to load and + store objects of the persistent class. The Hibernate mapping + file is one choice for providing Hibernate with this metadata. </para> + <orderedlist> + <title>Functions of the <literal>class</literal> element</title> + <listitem> + <para> + The <literal>class</literal> attribute, combined here with the + <literal>package</literal> attribute from the containing + <literal>hibernate-mapping</literal> element, names the FQN of + the class you want to define as an entity. + </para> + </listitem> + <listitem> + <para> + The <literal>table</literal> attribute names the database + table which contains the data for this entity. + </para> + </listitem> + </orderedlist> + <para> - The <literal>class</literal> element here is doing 2 things. - <orderedlist> - <listitem> - <para> - The <literal>class</literal> attribute (here combined with the <literal>package</literal> - attribute from the containing <literal>hibernate-mapping</literal> element) names the FQN - of the class we want to define as an entity. - </para> - </listitem> - <listitem> - <para> - The <literal>table</literal> attribute names the database table which contains the data - for this entity. - </para> - </listitem> - </orderedlist> + Instances of <classname>Event</classname> are now mapped to rows + in the <literal>EVENTS</literal> table. Hibernate uses the + <literal>id</literal> element to uniquely identify rows in the + table. </para> - <para> - Instances of <classname>Event</classname> are now "mapped" to rows in the <literal>EVENTS</literal> table. - But an assumption there is that Hibernate knows how to uniquely identify rows in the table. This is the - purpose of the <literal>id</literal> element. It names the column(s) which uniquely identify each row. - </para> - <note> + <important> <para> - It is not strictly necessary that the <literal>id</literal> element map to the table's - actual primary key column(s); however that is the normal convention. Nor is it strictly - necessary that tables mapped in Hibernate even define primary keys, the Hibernate team - <emphasis>highly</emphasis> recommends all schemas define proper referential integrity. - Therefore <literal>id</literal> and primary key are used interchangeably throughout Hibernate - documentation. + It is not strictly necessary that the <literal>id</literal> + element map to the table's actual primary key column(s), but + it is the normal convention. Tables mapped in Hibernate do + not even need to define primary keys. However, the Hibernate + team <emphasis>strongly</emphasis> recommends that all + schemas define proper referential integrity. Therefore + <literal>id</literal> and <phrase>primary key</phrase> are + used interchangeably throughout Hibernate documentation. </para> - </note> + </important> <para> - The <literal>id</literal> element here identifies the <literal>EVENT_ID</literal> column as the primary - key of the <literal>EVENTS</literal> table. Further, it names the <literal>id</literal> property of - the <classname>Event</classname> class is the property to hold the identifier value. + The <literal>id</literal> element here identifies the + <literal>EVENT_ID</literal> column as the primary key of the + <literal>EVENTS</literal> table. It also identifies the + <literal>id</literal> property of the + <classname>Event</classname> class as the property to hold the + identifier value. </para> <para> - In regards to the <literal>generator</literal> element nested inside the <literal>id</literal> element, - for now just be aware that it tells Hibernate the strategy used to generated primary key values for - this entity. Here we are telling it to use a sequence-like value generation. + The important thing to be aware of about the + <literal>generator</literal> element nested inside the + <literal>id</literal> element is that it informs Hibernate which + strategy is used to generated primary key values for this + entity. In this instance, it uses a sequence-like value + generation. </para> <para> - The 2 <literal>property</literal> elements are declaring the remaining 2 properties of the - <classname>Event</classname> class: <literal>date</literal> and <literal>title</literal>. Notice - that the <literal>date</literal> property mapping include the <literal>column</literal> - attribute, but the <literal>title</literal> does not. Without the <literal>column</literal> - attribute, Hibernate by default uses the property name as the column name. This works for - <literal>title</literal>, however, <literal>date</literal> is a reserved keyword in most databases - so you will need to explicitly tell Hibernate the column name in this case. + The two <literal>property</literal> elements declare the + remaining two properties of the <classname>Event</classname> + class: <literal>date</literal> and <literal>title</literal>. + The <literal>date</literal> property mapping include the + <literal>column</literal> attribute, but the + <literal>title</literal> does not. In the absense of a + <literal>column</literal> attribute, Hibernate uses the property + name as the column name. This is appropriate for + <literal>title</literal>, but since <literal>date</literal> is a + reserved keyword in most databases, you need to specify a + non-reserved word for the column name. </para> <para> - The <literal>title</literal> mapping also lacks a <literal>type</literal> attribute. The - types declared and used in the mapping files are not Java data types; they are not SQL - database types either. These types are called <emphasis>Hibernate mapping types</emphasis>, - converters which can translate from Java to SQL data types and vice versa. Hibernate will try to - determine the correct conversion and mapping type itself if the <literal>type</literal> attribute is not - present in the mapping by using Java reflection to determine the Java type of the declared property - and using a default mapping type for that Java type. In some cases this automatic detection might not - have the default you expect or need. This is the case with the <literal>date</literal> property. - Hibernate cannot know if the property, which is of type <classname>java.util.Date</classname>, should - map to a SQL <literal>DATE</literal>, <literal>TIME</literal>, or <literal>TIMESTAMP</literal> datatype. - Full date and time information is preserved by mapping the property with a <literal>timestamp</literal> - converter. + The <literal>title</literal> mapping also lacks a + <literal>type</literal> attribute. The types declared and used + in the mapping files are neither Java data types nor SQL + database types. Instead, they are <firstterm><phrase>Hibernate + mapping types</phrase></firstterm>. Hibernate mapping types are + converters which translate between Java and SQL data types. + Hibernate attempts to determine the correct conversion and + mapping type autonomously if the <literal>type</literal> + attribute is not present in the mapping, by using Java + reflection to determine the Java type of the declared property + and using a default mapping type for that Java type. + </para> + <para> + In some cases this automatic detection might not have the + default you expect or need, as seen with the + <literal>date</literal> property. Hibernate cannot know if the + property, which is of type + <classname>java.util.Date</classname>, should map to a SQL + <literal>DATE</literal>, <literal>TIME</literal>, or + <literal>TIMESTAMP</literal> datatype. Full date and time + information is preserved by mapping the property to a + <literal>timestamp</literal> converter. </para> <tip> <para> - Hibernate makes this mapping type determination using reflection when the mapping files - are processed. This can take time and resources, so if startup performance is important - you should consider explicitly defining the type to use. + Hibernate makes this mapping type determination using + reflection when the mapping files are processed. This can + take time and resources. If startup performance is + important, consider explicitly defining the type to use. </para> </tip> - </step> <step id="hibernate-gsg-tutorial-native-config">