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<title>GNUstep Database Library Introduction 0.1: 5. Model Creation</title>
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<a name="Model-creation"></a>
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<a name="Model-Creation"></a>
<h1 class="chapter">5. Model Creation</h1>
<a name="index-model-creation"></a>
<p>Models can be created in 3 ways
</p>
<ol>
<li>
Manual written with property lists.
</li><li>
Hard coding the model in objective-c.
</li><li>
Creation of plists with the DBModeler application.
</li></ol>
<p>while DBModeler provides the easiest way, followed by manually writing the
property lists, and hard coding the model is both tedious and complicated.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top"><a href="#Example-model-file">5.0.1 Example model file</a></td><td> </td><td align="left" valign="top"> An example property list for a .eomodel file.
</td></tr>
<tr><td align="left" valign="top"><a href="#Creating-with-DBModeler">5.0.2 Creating with DBModeler</a></td><td> </td><td align="left" valign="top"> Instructions for recreating the property list with
DBModeler
</td></tr>
</table>
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<a name="Example-model-file-1"></a>
<h3 class="subsection">5.0.1 Example model file</h3>
<p>Below is a example property list model created with DBModeler,
it contains a Model for a library 2 entities, author and book
</p>
<p>author contains 2 attributes, authorID the primary key number, and name a string
book contains 3 attributes, bookID the primary key number, authorID a
foreign key number, and title a string.
</p>
<p>author and book each contain a relationship
author a to-many relationship to each of the authors books,
and book a to-one relationship to the books author
for the sake of demonstration i’m ignoring books with multiple authors.
</p>
<p>it also contains an adaptor name, and an adaptor specific connection dictionary.
</p>
<pre class="verbatim">{
EOModelVersion = 2;
adaptorName = SQLite3;
connectionDictionary = {
databasePath = "/tmp/example.db";
};
entities = (
{
attributes = (
{
columnName = authorID;
externalType = integer;
name = authorID;
valueClassName = NSNumber;
},
{
columnName = name;
externalType = varchar;
name = name;
valueClassName = NSString;
}
);
className = EOGenericRecord;
classProperties = (
name,
toBooks
);
externalName = authors;
name = authors;
primaryKeyAttributes = (
authorID
);
relationships = (
{
destination = books;
isToMany = Y;
joinSemantic = EOInnerJoin;
joins = (
{
destinationAttribute = authorID;
sourceAttribute = authorID;
}
);
name = toBooks;
}
);
},
{
attributes = (
{
columnName = authorID;
externalType = integer;
name = authorID;
valueClassName = NSNumber;
},
{
columnName = bookID;
externalType = integer;
name = bookID;
valueClassName = NSNumber;
},
{
columnName = title;
externalType = varchar;
name = title;
valueClassName = NSString;
}
);
className = EOGenericRecord;
classProperties = (
title,
toAuthor
);
externalName = books;
name = books;
primaryKeyAttributes = (
bookID
);
relationships = (
{
destination = authors;
isToMany = N;
joinSemantic = EOInnerJoin;
joins = (
{
destinationAttribute = authorID;
sourceAttribute = authorID;
}
);
name = toAuthor;
}
);
}
);
name = library;
}
</pre>
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<a name="Creating-with-DBModeler-1"></a>
<h3 class="subsection">5.0.2 Creating with DBModeler</h3>
<p>To recreate the example model with DBModeler,
</p>
<p>select Document, New from the main menu then property Add entity twice.
set the name and external names to ’authors’ and ’books’
</p>
<p>select Document, Set Adaptor Info, and select SQLite, and click Ok,
this will bring up the SQLite login panel, where you need to provide it a path
for where to create the model file.
</p>
<p>Each Adaptor will have different requirements, so each login panel is quite
different. Other adaptors may have a server address, username, and database names.
</p>
<p>select the authors entity in the outline view, after expanding the model
add an attribute to authors by selecting Property, Add attribute
set the name and column name to ’authorID’,
and select the switch button with a key icon, to set it as the primary key
for the entity. Set the value class name to NSNumber and the external type to INTEGER
</p>
<p>Add another entity, set the name and column names to ’name’.
Select the switch button which looks like a jewel icon to set it as a Class Property. Set the Value Class Name to NSString and external type to TEXT.
</p>
<p>now do the same with books,
name them bookID, authorID, and title.
make sure bookID is set as the primary key not authorID in the books entity.
And that title is set as a class property.
</p>
<p>title is a NSString/TEXT, where authorID and bookID are NSNumber/INTEGER
</p>
<p>now add a relationship to authors
name it toBooks, and Tools, inspector
in the destination table, select To many, and books as the destination entity.
</p>
<p>select authorID as the source and destination attributes
</p>
<p>add a relationship to books, name it toAuthor.
Select author as the destination entity, and authorID as the source
and destination attributes.
</p>
<p>The select Document, Save, from the main menu.
</p>
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