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<title>GNUstep Database Library Introduction 0.1: Example model file</title>

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<a name="Example-model-file-1"></a>
<h3 class="section">24.1 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&rsquo;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 = &quot;/tmp/example.db&quot;;
    };
    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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gnustep-dl2 0.12.0-15.1 / usr / share / GNUstep / Documentation / GDL2Intro / Example-model-file.html
