From 0d65ade271af40c54f82d094b7b7d6aa7655ddf4 Mon Sep 17 00:00:00 2001
From: Martin Goik <goik@hdm-stuttgart.de>
Date: Thu, 15 Jan 2015 19:02:00 +0100
Subject: [PATCH] continuing three main inheritance strategies

---
 .../billing/{Driver.java => CreateData.java}  |   17 +-
 .../mi/sda2/jpa/billing/ReadData.java         |   54 +
 .../sda2/jpa/billing/domain/BankAccount.java  |   25 +-
 .../jpa/billing/domain/BillingDetail.java     |   38 +-
 .../sda2/jpa/billing/domain/CreditCard.java   |   15 +-
 .../mi/sda2/jpa/billing/domain/Customer.java  |   53 +
 .../main/resources/META-INF/persistence.xml   |   29 +-
 Sda2/Ref/Fig/mapInherit.svg                   | 4420 ++++++++++++-----
 8 files changed, 3484 insertions(+), 1167 deletions(-)
 rename Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/{Driver.java => CreateData.java} (69%)
 create mode 100644 Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/ReadData.java
 create mode 100644 Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/domain/Customer.java

diff --git a/Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/Driver.java b/Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/CreateData.java
similarity index 69%
rename from Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/Driver.java
rename to Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/CreateData.java
index 2a7014409..8eb3b3be7 100644
--- a/Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/Driver.java
+++ b/Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/CreateData.java
@@ -12,21 +12,21 @@ import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 import de.hdm_stuttgart.mi.sda2.jpa.billing.domain.CreditCard;
+import de.hdm_stuttgart.mi.sda2.jpa.billing.domain.Customer;
 
 /**
  * A simple http://logging.apache.org/log4j/2.x demo, see file log4j2.xml for
  * configuration options.
  * 
  */
-public class Driver {
-   private static Logger log = LogManager.getLogger(Driver.class);
+public class CreateData {
+   private static Logger log = LogManager.getLogger(CreateData.class);
 
    /**
     * @param args
     *           Unused
-    * @throws JAXBException
     */
-   public static void main(String[] args) throws JAXBException {
+   public static void main(String[] args)  {
 
       final EntityManagerFactory factory = Persistence
             .createEntityManagerFactory("persistenceUnit");
@@ -34,11 +34,14 @@ public class Driver {
 
       final EntityTransaction tx = manager.getTransaction();
 
-      final CreditCard myCard = new CreditCard("Joe Blix", "Visa", new Date()); 
-
       tx.begin();
       {
-         manager.persist(myCard);
+         final Customer customer = new Customer("Joe Blix");
+         
+         final CreditCard myCard = new CreditCard(customer, "Visa"); 
+         myCard.setExpiry(new Date());
+
+         manager.persist(customer);
       }
       tx.commit();
       log.info("done!");
diff --git a/Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/ReadData.java b/Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/ReadData.java
new file mode 100644
index 000000000..08e807b5e
--- /dev/null
+++ b/Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/ReadData.java
@@ -0,0 +1,54 @@
+package de.hdm_stuttgart.mi.sda2.jpa.billing;
+
+import java.util.List;
+
+import javax.persistence.EntityManager;
+import javax.persistence.EntityManagerFactory;
+import javax.persistence.EntityTransaction;
+import javax.persistence.Persistence;
+import javax.persistence.Query;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import de.hdm_stuttgart.mi.sda2.jpa.billing.domain.BillingDetail;
+import de.hdm_stuttgart.mi.sda2.jpa.billing.domain.Customer;
+
+/**
+ * A simple http://logging.apache.org/log4j/2.x demo, see file log4j2.xml for
+ * configuration options.
+ * 
+ */
+public class ReadData {
+   private static Logger log = LogManager.getLogger(ReadData.class);
+
+   /**
+    * @param args Unused
+    */
+   @SuppressWarnings("unchecked")
+   public static void main(String[] args) {
+
+      final EntityManagerFactory factory = Persistence
+            .createEntityManagerFactory("persistenceReadUnit");
+      final EntityManager manager = factory.createEntityManager();
+
+      final EntityTransaction tx = manager.getTransaction();
+
+      final Query searchCustomer = manager.createQuery("select c from Customer c");
+      tx.begin();
+      {
+         final List<Customer> customers = searchCustomer.getResultList();
+         
+         for (final Customer c: customers) {
+            System.out.println("---------------------\n" + c.getName());
+            for (final BillingDetail b : c.getBillings()) {
+               System.out.println(b);
+            }
+         }
+      }
+      tx.commit();
+      log.info("done!");
+
+   }
+
+}
diff --git a/Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/domain/BankAccount.java b/Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/domain/BankAccount.java
index 6fc640c78..fef06f215 100644
--- a/Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/domain/BankAccount.java
+++ b/Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/domain/BankAccount.java
@@ -1,14 +1,33 @@
 package de.hdm_stuttgart.mi.sda2.jpa.billing.domain;
 
+
+
 import javax.persistence.Entity;
 
 /**
  * pay by wire transfer
  *
  */
-@Entity 
+@Entity
 public class BankAccount extends BillingDetail {
-  String iban;
-}
+   String iban;
+
+   protected BankAccount() {
+      super();
+   }
 
+   @SuppressWarnings("javadoc")
+   public BankAccount(final Customer customer, final String iban) {
+      super(customer);
+      setIban(iban);
+   }
 
+   public String getIban() {
+      return iban;
+   }
+
+   public void setIban(String iban) {
+      this.iban = iban;
+   }
+
+}
diff --git a/Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/domain/BillingDetail.java b/Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/domain/BillingDetail.java
index a7d518bbc..1fc76dff8 100644
--- a/Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/domain/BillingDetail.java
+++ b/Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/domain/BillingDetail.java
@@ -1,6 +1,7 @@
 package de.hdm_stuttgart.mi.sda2.jpa.billing.domain;
 
-import javax.persistence.Column;
+
+import javax.persistence.CascadeType;
 import javax.persistence.DiscriminatorColumn;
 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
@@ -8,6 +9,7 @@ import javax.persistence.GenerationType;
 import javax.persistence.Id;
 import javax.persistence.Inheritance;
 import javax.persistence.InheritanceType;
+import javax.persistence.ManyToOne;
 
 /**
  * Base class for payment related purposes
@@ -20,30 +22,36 @@ public abstract class BillingDetail {
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    Long id;
-   
-   @Column(nullable=false)
-   String owner;
+
+   @ManyToOne(cascade= CascadeType.ALL)
+   Customer customer;
+
    
    protected BillingDetail() {}
    
-   @SuppressWarnings("javadoc")
-   public BillingDetail(final String owner) {
-      setOwner(owner);
+   public BillingDetail(Customer customer) {
+      customer.addBilling(this);
    }
+   
 
    @SuppressWarnings("javadoc")
-   public String getOwner() {
-      return owner;
+   public Long getId() {
+      return id;
+   }
+   
+   public Customer getCustomer() {
+      return customer;
    }
 
-   @SuppressWarnings("javadoc")
-   public void setOwner(String owner) {
-      this.owner = owner;
+   public void setCustomer(Customer customer) {
+      this.customer = customer;
    }
 
-   @SuppressWarnings("javadoc")
-   public Long getId() {
-      return id;
+   @Override
+   public String toString() {
+      return "Account of " + customer.getName();
    }
    
+   
+   
 }
diff --git a/Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/domain/CreditCard.java b/Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/domain/CreditCard.java
index 56b7ab4dc..ebbc92d60 100644
--- a/Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/domain/CreditCard.java
+++ b/Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/domain/CreditCard.java
@@ -2,6 +2,7 @@ package de.hdm_stuttgart.mi.sda2.jpa.billing.domain;
 
 import java.util.Date;
 
+import javax.persistence.Column;
 import javax.persistence.Entity;
 import javax.persistence.Temporal;
 import javax.persistence.TemporalType;
@@ -16,6 +17,7 @@ import javax.persistence.TemporalType;
 public class CreditCard extends BillingDetail {
    String cardCompany;
    
+   @Column(nullable=false)
    @Temporal(TemporalType.DATE)
    Date expiry;
    
@@ -25,10 +27,9 @@ public class CreditCard extends BillingDetail {
    }
    
    @SuppressWarnings("javadoc")
-   public CreditCard(final String owner, final String company, final Date expiry) {
-      super(owner);
+   public CreditCard(final Customer customer, final String company) {
+      super(customer);
       setCardCompany(company);
-      setExpiry(expiry);
    }
 
    @SuppressWarnings("javadoc")
@@ -49,5 +50,13 @@ public class CreditCard extends BillingDetail {
    @SuppressWarnings("javadoc")
    public void setExpiry(Date expiry) {
       this.expiry = expiry;
+   }
+
+   @Override
+   public String toString() {
+     
+      return getCardCompany() + " credit card, expiry =" + getExpiry() + ", " + super.toString();
    } 
+   
+   
 }
diff --git a/Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/domain/Customer.java b/Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/domain/Customer.java
new file mode 100644
index 000000000..ad76896fb
--- /dev/null
+++ b/Sda2/P/Jpa/Inherit/Tpch/src/main/java/de/hdm_stuttgart/mi/sda2/jpa/billing/domain/Customer.java
@@ -0,0 +1,53 @@
+package de.hdm_stuttgart.mi.sda2.jpa.billing.domain;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.persistence.CascadeType;
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.OneToMany;
+
+@Entity
+public class Customer {
+
+   @Id @GeneratedValue(strategy=GenerationType.IDENTITY)
+   Long id;
+   
+   @Column(nullable=false)
+   String name;
+   
+   @OneToMany(mappedBy="customer", cascade= CascadeType.ALL)
+   List<BillingDetail> billings = new ArrayList<BillingDetail>();
+   
+   protected Customer() {}
+   
+   public Customer(final String name) {
+      setName(name);
+   }
+
+   public String getName() {
+      return name;
+   }
+
+   public void setName(String name) {
+      this.name = name;
+   }
+
+   public Long getId() {
+      return id;
+   }
+   
+   public void addBilling(final BillingDetail billing) {
+      billings.add(billing);
+      billing.setCustomer(this);
+   }
+
+   public List<BillingDetail> getBillings() {
+      return billings;
+   }
+   
+}
diff --git a/Sda2/P/Jpa/Inherit/Tpch/src/main/resources/META-INF/persistence.xml b/Sda2/P/Jpa/Inherit/Tpch/src/main/resources/META-INF/persistence.xml
index 64646e14e..76c8c4aef 100644
--- a/Sda2/P/Jpa/Inherit/Tpch/src/main/resources/META-INF/persistence.xml
+++ b/Sda2/P/Jpa/Inherit/Tpch/src/main/resources/META-INF/persistence.xml
@@ -6,21 +6,44 @@
 		<!-- shouldn't be valid for java SE per specification, but it works for EclipseLink ... -->
 		<exclude-unlisted-classes>false</exclude-unlisted-classes>
 		<properties>
-		
+			
 			<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
 			<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/hdm" />
 			<property name="javax.persistence.jdbc.user" value="hdmuser" />
 			<property name="javax.persistence.jdbc.password" value="XYZ" />
-
+			
 			<!-- EclipseLink should create the database schema automatically -->
 			<property name="eclipselink.ddl-generation" value="drop-and-create-tables" />
 			<property name="eclipselink.ddl-generation.output-mode" value="database" />
 			<property name="eclipselink.logging.level" value="SEVERE"/>	
-
+			
 			<!-- Logging SQL operations -->
 			<property name="eclipselink.logging.level.sql" value="FINE"/>
 			<property name="eclipselink.logging.parameters" value="true"/>
 		</properties>
+		
+	</persistence-unit>
+
 
+	<persistence-unit name="persistenceReadUnit" transaction-type="RESOURCE_LOCAL">
+		<!-- shouldn't be valid for java SE per specification, but it works for EclipseLink ... -->
+		<exclude-unlisted-classes>false</exclude-unlisted-classes>
+		<properties>
+			
+			<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
+			<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/hdm" />
+			<property name="javax.persistence.jdbc.user" value="hdmuser" />
+			<property name="javax.persistence.jdbc.password" value="XYZ" />
+			
+			<!-- EclipseLink should create the database schema automatically -->
+			<property name="eclipselink.ddl-generation" value="none" />
+			<property name="eclipselink.ddl-generation.output-mode" value="database" />
+			<property name="eclipselink.logging.level" value="SEVERE"/>	
+			
+			<!-- Logging SQL operations -->
+			<property name="eclipselink.logging.level.sql" value="FINE"/>
+			<property name="eclipselink.logging.parameters" value="true"/>
+		</properties>
+		
 	</persistence-unit>
 </persistence>
\ No newline at end of file
diff --git a/Sda2/Ref/Fig/mapInherit.svg b/Sda2/Ref/Fig/mapInherit.svg
index 5f4853359..ce3dc9682 100644
--- a/Sda2/Ref/Fig/mapInherit.svg
+++ b/Sda2/Ref/Fig/mapInherit.svg
@@ -24,11 +24,11 @@
      borderopacity="1.0"
      inkscape:pageopacity="0.0"
      inkscape:pageshadow="2"
-     inkscape:zoom="1.3828889"
+     inkscape:zoom="1.3151366"
      inkscape:cx="526.18109"
-     inkscape:cy="400.9722"
+     inkscape:cy="372.04724"
      inkscape:document-units="px"
-     inkscape:current-layer="g8293"
+     inkscape:current-layer="g13157"
      showgrid="true"
      inkscape:window-width="1920"
      inkscape:window-height="1176"
@@ -1319,6 +1319,143 @@
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          inkscape:connector-curvature="0" />
     </marker>
+    <marker
+       style="overflow:visible"
+       id="DotMQ-0"
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+       orient="auto"
+       inkscape:stockid="DotMQ">
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+    <marker
+       style="overflow:visible"
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+    <marker
+       style="overflow:visible"
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+       style="overflow:visible"
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+       style="overflow:visible"
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+         transform="scale(0.8) translate(-6,0)" />
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+    <marker
+       style="overflow:visible"
+       id="Arrow1Mend-6-8-5"
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   </defs>
   <metadata
      id="metadata7">
@@ -1820,7 +1957,7 @@
   </g>
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-         y="174.09448"
-         x="490"
-         sodipodi:role="line"
-         id="tspan3535-2">F.d. 2</tspan><tspan
-         id="tspan5081"
-         y="214.09448"
-         x="490"
+         y="514.09448"
+         x="530"
+         id="tspan13311-3"
+         sodipodi:role="line">owner</tspan><tspan
+         id="tspan13313-4"
+         y="536.59448"
+         x="530"
          sodipodi:role="line" /></text>
     <text
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        xml:space="preserve"><tspan
-         y="534.09448"
-         x="170"
+         y="544.09448"
+         x="530"
+         id="tspan13247"
+         sodipodi:role="line">Tim Lee</tspan></text>
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+     inkscape:label="Table per concrete class , pros and cons copy copy"
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+       id="flowRoot5413"
+       style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-indent:0;text-align:start;text-decoration:none;line-height:125%;letter-spacing:0px;word-spacing:0px;text-transform:none;direction:ltr;block-progression:tb;writing-mode:lr-tb;text-anchor:start;baseline-shift:baseline;color:#000000;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:1px;marker:none;visibility:visible;display:inline;overflow:visible;enable-background:accumulate;font-family:Monospace;-inkscape-font-specification:Monospace"><flowRegion
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+         id="flowPara5419" /></flowRoot>    <text
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+       style="font-size:18px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-indent:0;text-align:start;text-decoration:none;line-height:125%;letter-spacing:0px;word-spacing:0px;text-transform:none;direction:ltr;block-progression:tb;writing-mode:lr-tb;text-anchor:start;baseline-shift:baseline;color:#000000;fill:#008000;fill-opacity:1;fill-rule:nonzero;stroke:#008000;stroke-width:1px;marker:none;visibility:visible;display:inline;overflow:visible;enable-background:accumulate;font-family:Monospace;-inkscape-font-specification:Monospace"
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+       sodipodi:linespacing="125%"><tspan
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-         id="tspan3535-3">F.d. 1: id → ortKreis</tspan></text>
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+         y="454.09448" /></text>
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+       id="text5425"
+       y="44.094482"
+       x="10"
+       style="font-size:40px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;line-height:125%;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;display:inline;font-family:Sans;-inkscape-font-specification:Sans"
        xml:space="preserve"><tspan
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-         x="170"
+         y="44.094482"
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-         id="tspan3535-3-8">F.d. 2:         ortKreis → ortKreisName</tspan></text>
+         id="tspan5427">Table per concrete class , pros and cons</tspan></text>
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+         id="flowPara5435" /></flowRoot>    <text
+       xml:space="preserve"
+       style="font-size:36px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-indent:0;text-align:start;text-decoration:none;line-height:125%;letter-spacing:0px;word-spacing:0px;text-transform:none;direction:ltr;block-progression:tb;writing-mode:lr-tb;text-anchor:start;baseline-shift:baseline;color:#000000;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:1px;marker:none;visibility:visible;display:inline;overflow:visible;enable-background:accumulate;font-family:Sans;-inkscape-font-specification:Sans"
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+       sodipodi:linespacing="125%"><tspan
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+       style="font-size:36px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-indent:0;text-align:start;text-decoration:none;line-height:125%;letter-spacing:0px;word-spacing:0px;text-transform:none;direction:ltr;block-progression:tb;writing-mode:lr-tb;text-anchor:start;baseline-shift:baseline;color:#000000;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:1px;marker:none;visibility:visible;display:inline;overflow:visible;enable-background:accumulate;font-family:Sans;-inkscape-font-specification:Sans"
        x="10"
-       style="font-size:32px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;line-height:125%;letter-spacing:0px;word-spacing:0px;fill:#ff00ff;fill-opacity:1;stroke:none;display:inline;font-family:Sans;-inkscape-font-specification:Sans"
-       xml:space="preserve"><tspan
-         y="654.09448"
+       y="264.09448"
+       id="text5441"
+       sodipodi:linespacing="125%"><tspan
+         sodipodi:role="line"
+         id="tspan5443"
          x="10"
+         y="264.09448">➢ Negative</tspan></text>
+    <text
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+       style="font-size:36px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-indent:0;text-align:start;text-decoration:none;line-height:125%;letter-spacing:0px;word-spacing:0px;text-transform:none;direction:ltr;block-progression:tb;writing-mode:lr-tb;text-anchor:start;baseline-shift:baseline;color:#000000;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:1px;marker:none;visibility:visible;display:inline;overflow:visible;enable-background:accumulate;font-family:Monospace;-inkscape-font-specification:Monospace"
+       x="60"
+       y="314.09448"
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+       sodipodi:linespacing="125%"><tspan
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-         id="tspan3535-3-4">Transitive F.d. 3: id       →            ortKreisName</tspan></text>
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+         id="tspan5451"
+         x="60"
+         y="314.09448">•Polymorphic queries require UNION statements</tspan><tspan
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+         sodipodi:role="line"
+         x="60"
+         y="359.09448">   ⇒ possibly poor performance </tspan></text>
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-       sodipodi:linespacing="125%"
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+       x="40"
        y="194.09448"
-       x="250"
-       style="font-size:32px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;line-height:125%;letter-spacing:0px;word-spacing:0px;fill:#ff00ff;fill-opacity:1;stroke:none;display:inline;font-family:Sans;-inkscape-font-specification:Sans"
-       xml:space="preserve"><tspan
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+       id="text5457"
+       sodipodi:linespacing="125%"><tspan
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-         id="tspan3535-2-1">F.d. 3</tspan><tspan
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-         y="234.09448"
-         x="250"
-         sodipodi:role="line" /></text>
+         id="tspan5459"
+         x="40"
+         y="194.09448">•Transparent <tspan
+   style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:Sans;-inkscape-font-specification:Sans"
+   id="tspan5461">integrity constraints (NULL)</tspan></tspan></text>
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+       xml:space="preserve"
+       id="flowRoot5463"
+       style="font-size:36px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-indent:0;text-align:start;text-decoration:none;line-height:125%;letter-spacing:0px;word-spacing:0px;text-transform:none;direction:ltr;block-progression:tb;writing-mode:lr-tb;text-anchor:start;baseline-shift:baseline;color:#000000;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:1px;marker:none;visibility:visible;display:inline;overflow:visible;enable-background:accumulate;font-family:Monospace;-inkscape-font-specification:Monospace"><flowRegion
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+         id="flowPara5469" /></flowRoot>    <text
+       xml:space="preserve"
+       style="font-size:36px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-indent:0;text-align:start;text-decoration:none;line-height:125%;letter-spacing:0px;word-spacing:0px;text-transform:none;direction:ltr;block-progression:tb;writing-mode:lr-tb;text-anchor:start;baseline-shift:baseline;color:#000000;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:1px;marker:none;visibility:visible;display:inline;overflow:visible;enable-background:accumulate;font-family:Monospace;-inkscape-font-specification:Monospace"
+       x="40"
+       y="144.09448"
+       id="text5471"
+       sodipodi:linespacing="125%"><tspan
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+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:Sans;-inkscape-font-specification:Sans">•Easy inheritance hierarchy extension + understanding</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:36px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-indent:0;text-align:start;text-decoration:none;line-height:125%;letter-spacing:0px;word-spacing:0px;text-transform:none;direction:ltr;block-progression:tb;writing-mode:lr-tb;text-anchor:start;baseline-shift:baseline;color:#000000;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:1px;marker:none;visibility:visible;display:inline;overflow:visible;enable-background:accumulate;font-family:Monospace;-inkscape-font-specification:Monospace"
+       x="60"
+       y="424.09448"
+       id="text5457-7"
+       sodipodi:linespacing="125%"><tspan
+         sodipodi:role="line"
+         id="tspan5459-3"
+         x="60"
+         y="424.09448">•Duplicate columns for &quot;deep&quot; hierarchies</tspan><tspan
+         sodipodi:role="line"
+         x="60"
+         y="469.09448"
+         id="tspan5499">  ⇒ suitable for &quot;flat&quot; hierarchies</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:36px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-indent:0;text-align:start;text-decoration:none;line-height:125%;letter-spacing:0px;word-spacing:0px;text-transform:none;direction:ltr;block-progression:tb;writing-mode:lr-tb;text-anchor:start;baseline-shift:baseline;color:#000000;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:1px;marker:none;visibility:visible;display:inline;overflow:visible;enable-background:accumulate;font-family:Monospace;-inkscape-font-specification:Monospace"
+       x="60"
+       y="624.09448"
+       id="text5457-1"
+       sodipodi:linespacing="125%"><tspan
+         sodipodi:role="line"
+         id="tspan5459-7"
+         x="60"
+         y="624.09448">•De-normalized when &quot;deep&quot;, scattering of</tspan><tspan
+         sodipodi:role="line"
+         x="60"
+         y="669.09448"
+         id="tspan5653">  parent class attributes</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:36px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-indent:0;text-align:start;text-decoration:none;line-height:125%;letter-spacing:0px;word-spacing:0px;text-transform:none;direction:ltr;block-progression:tb;writing-mode:lr-tb;text-anchor:start;baseline-shift:baseline;color:#000000;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:1px;marker:none;visibility:visible;display:inline;overflow:visible;enable-background:accumulate;font-family:Monospace;-inkscape-font-specification:Monospace"
+       x="60"
+       y="534.09448"
+       id="text5457-1-0"
+       sodipodi:linespacing="125%"><tspan
+         sodipodi:role="line"
+         id="tspan5459-7-0"
+         x="60"
+         y="534.09448">•Order of data by class first</tspan></text>
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-- 
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