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Commit 052cd97a authored by Goik Martin's avatar Goik Martin
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persistence illustration

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Doc/Ref/Fig/Makefile
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......@@ -5,6 +5,7 @@
FIGFILES=booknavigate clientserv contentmixed cpp crossmedia dictionaryStack \
entityresolve externalize filtering headfoot heartland jdbcarch jdbcFourTier \
persistence \
jdbcObjectRelation jdbcread jdbcReadWrite jdbcSniffing jdbcThreeTier \
jdbcurl memofour memorelativexpath memotree memoxpath overlay pagerefhyperStack \
pagerefStack pageStack persistHandlerStates preceding regions saxxmlrdbms sqlinject \
......
Doc/Ref/Fig/persistence.fig 0 → 100644
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#FIG 3.2 Produced by xfig version 3.2.5b
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Doc/course.xml
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......@@ -620,6 +620,63 @@ drwxr-xr-x 4 goik fb1prof 4096 Nov 8 22:04 ..
<chapter xml:id="intro">
<title>Accessing Relational Data</title>
 
<section xml:id="persistence">
<title>Persistence in Object Oriented languages</title>
<para>Following <xref linkend="Bauer05"/> we may define persistence
by:</para>
<blockquote>
<para>persistence allows an object to outlive the process that
created it. The state of the object may be stored to disk and an
object with the same state re-created at some point in the
future.</para>
</blockquote>
<para>The notion of <quote>process</quote> refers to operating
systems. Let us start wit a simple example assuming a Java class
User:</para>
<programlisting>public class User {
String cname; //The user's common name e.g. 'Joe Bix'
String uid; //The user's unique system user ID (login) e.g. 'bix'
// getters, setters and other stuff
...
}</programlisting>
<para>A relational implementation might look like:</para>
<programlisting>CREATE TABLE User(
CHAR(80) cname
,CHAR(10) uid PRIMARY KEY
)</programlisting>
<para>Now a Java application may create instances of class
<code>User</code> and save these to a database: </para>
<figure xml:id="processObjPersist">
<title>Persistence across process boundaries</title>
<mediaobject>
<imageobject>
<imagedata fileref="Ref/Fig/persistence.fig"/>
</imageobject>
</mediaobject>
</figure>
<para>Both the jre instances and the RDBMS database server are
processes (or sets of processes) typically existing in different
address spaces. The two jre processes mentioned here may as well be
started in disjoint address spaces. In fact we might even run two
entirely different applications implemented in other languages like
<acronym>Php</acronym>.</para>
<para>It is important to mention that the two safe and load arrows
thus typically denote a communication across machine
boundaries.</para>
</section>
<section xml:id="jdbcIntro">
<title>Introduction to <trademark
xlink:href="http://electronics.zibb.com/trademark/jdbc/29545026">JDBC</trademark></title>
......@@ -991,25 +1048,41 @@ drwxr-xr-x 4 goik fb1prof 4096 Nov 8 22:04 ..
 
<programlisting>Successfully inserted 1 dataset(s)</programlisting>
 
<para>However a second invocation yields:</para>
<qandaset role="exercise">
<qandadiv>
<qandaentry>
<question>
<para>A second invocation of
<classname>sda.jdbc.intro.v1.SimpleInsert</classname> yields
the following runtime error:</para>
 
<programlisting>Exception in thread "main" com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException:
<programlisting>Exception in thread "main" com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException:
<emphasis role="bold">Duplicate entry 'jim@foo.org' for key 'email'</emphasis>
...
at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1617)
at sda.jdbc.intro.SimpleInsert.main(SimpleInsert.java:17)</programlisting>
</question>
 
<para>This (expected) error is easy to understand: The exception's
message text <emphasis role="bold">Duplicate entry 'Jim' for key
'PRIMARY'</emphasis> informs us about a UNIQUE key constraint
violation with respect to our schema definition in <xref
linkend="figSchemaPerson"/>.</para>
<answer>
<para>This expected error is easy to understand: The
exception's message text <emphasis role="bold">Duplicate
entry 'Jim' for key 'PRIMARY'</emphasis> informs us about a
UNIQUE key constraint violation with respect to the
attribute <code>email</code> in our schema definition in
<xref linkend="figSchemaPerson"/>. We cannot add a second
entry with the same value <code>'jim@foo.org'</code>.</para>
</answer>
</qandaentry>
</qandadiv>
</qandaset>
 
<para>It is worth to mention that the
<productname>Mysql</productname> driver implementation does not have
to be available at compile time. On the other hand when working with
eclipse we need a separate runtime configuration for each runnable
<trademark
to be available at compile time. JDBC uses interfaces in favour of
concrete class. Only at runtime we do need concrete classes.</para>
<para>On the other hand when working with eclipse we need a separate
runtime configuration for each runnable <trademark
xlink:href="http://www.oracle.com/us/legal/third-party-trademarks/index.html">Java</trademark>
application. This becomes tedious after some time. So you may want
to follow the author and just add
......@@ -14871,8 +14944,8 @@ leader-pattern="dots"/&gt;C&lt;fo:leader leader-pattern="dots"/&gt;D&lt;/fo:bloc
<part>
<title>Structured Data and Applications 2</title>
 
<chapter xml:id="XXX">
<title>XXX</title>
<chapter xml:id="orm">
<title>Object Relational Mapping</title>
 
<para>XYZ</para>
</chapter>
......
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