library schema design

Let’s get back to the library system. First let’s look at the design. I have scanned in most of the books that we have on our bookshelves at home. I was surprised to find out that we have over 300 books. I didn’t scan the kids books in their room. My guess is that we have 600 books in the house. How did that happen? I imported these books into www.librarything.com so that I can auto populate most of the data by entering the ISBN number. I purchased a bar code scanner and found that the majority of the books include the ISBN number on the bar code. Many books have two bar code numbers, one for inventory control and one for ISBN. I selected librarything because it allows me to search the Library of Congress as well as Amazon to populate the library information. It allows you to enter the ISBN number, the book title, or the author name and it presents a list of matches. If there is no match in the Library of Congress, it allows you to search Amazon. I like this because between the two I found data for each book in our house. The biggest problem is that at times I found multiple copies because many books have multiple editions. A significant amount of the matches included a picture of the book cover which helped significantly.

The biggest benefit of this service is that it allows me to export the book information to a comma separated or tab separated file and import it into a database or Excel program.  The fields in this export are:

  • book id
  • title
  • author first and last name
  • author last and first name
  • other authors
  • publisher
  • date of publication
  • ISBN number
  • series
  • source (Amazon or Library of Congress)
  • language
  • language 2
  • original language
  • LC Call number
  • Dewey Decimal number
  • BCID
  • date entered
  • date entered
  • date entered
  • date entered
  • tags
  • rating
  • review
  • summary
  • comments
  • encoding

Looking at the data in this collection brings up a few questions. Why can’t I use Excel as the basis for this information? First, how do I record what is checked out and when it is checked out? Using one of the date entered and comments fields? I could but it would be difficult. The user who checks in and checks out books would need to be familiar with Excel and have a uniform way of checking in and checking out books. If multiple people do this using different fields or different formats, the data will become corrupted. We need to create a browser front end to make the data entry uniform and the way that data changes the same.

Second, if I wanted to sort the data using some index and perform a some simple analytics, an Excel spreadsheet will not work. If someone checks out a book and checks it back in, the record will be cleansed and lost if it is done in one spreadsheet. It would be nice at some time to find out what the most popular book is. It would also be nice to present a list of books that students have checked out and make it visible to parents and teachers. It gives both a tool to help educate the child and the librarian a starting point when they go to purchase more books. Analytics like this require a transactional log of book usage and who used them. Using a spreadsheet does not allow us to record these transactions or easily coordinate between two worksheets and archive this data. Some type of database is required for this information.

The discussion of checking in and checking out books requires another table schema. We need something simple to track the students.

  • Student id
  • Student first and last name
  • Homeroom teacher
  • Grade

With this information we can record when a student checks out a book by correlating a book to a student id. We can also let a parent look at the current books checked out by presenting the student id and searching for books checked out. The librarian can also tag a class of books for not to be checked out by grade levels. We might use either the series or rating elements in the book schema. For example, if a kindergartener wants to check out a book that is high school rated, the check out program will flag the process and require a verification that this child can check out this book.

We will also need a mechanism to record book status. This will require a specific schema element to track this.

  • book id
  • date checked out
  • student id

Some elements that are missing from this library schema are the cost of a book and the location of a book in the library. Since this library is a small library of a few thousand books with less than 20 book shelves, there is really no need to record this information. If we had multiple libraries or libraries in multiple rooms at the same site, we might want to record book location. If we were going to charge for books based on our cost of purchasing the book, we would want to record the cost of the books. Since our library is a volunteer library where the vast majority of books have been donated or purchased in bulk from Half Price Books, we don’t track the cost of each individual book. We do record how much has been spent on all of the books in the library. We have been collecting books for the past 8 months and have spent more on bookshelves than we have on books. We have just over 7000 books and have spent $500 on bookshelves (the cost of wood, nails, and screws) and $200 on books. The funding for these books came from a book fair where we got a percentage of profits from all books sold. During this book fair we had the teachers list books that they were interested in and books that they wanted in the library. The parents purchased a few hundred books and donated them to the library.

next topic on the library, use cases and user interface design. I will be using three different tools to design this library interface; Apps Express(HtmlDB), JDesigner, and NetBeans. The purpose of using three is to compare and contrast the three different tools for creating the same product. Once we have the design completed, we will look at what it takes to import our spreadsheet data into a database. The databases that we will evaluate are OracleXE, mySQL, and SQL Server Express. We will look at these three because they are all free databases.

845 thoughts on “library schema design”

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