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In this example, I am going to attach an image file, specifically the cover image for this book. If you want to download this image, you can find it at the following URL: http://www.apress.com/resource/bookcover/9781430272373 size=medium. The image is in GIF format and is less than 4KB in size. In the Upload Attachment dialog box, click the Choose File/Browse button, and select the file you want to attach. Then click the Upload button to save the attachment to the database. When the upload has finished, you will be brought back to the document page, and you will notice that there is now an _attachments field, and a new revision of the document has been created, as shown in Figure 5-13.

To perform such a test, you might accomplish the following steps: 1. Start a new transaction. 2. Insert a new record into the orders table. 3. Insert a new record into the details table, related to the record inserted in step 2. 4. Insert another new record into the details table, related to the record inserted in step 2. 5. Commit or roll back the transaction opened in step 1, depending on whether both steps 3 and 4 were successful. These steps simulate the behavior of your application. It is important that the previous insert statements are issued within a single transaction. This allows you to roll back the changes made by all the inserts if at least one of them fails. Figure 6-3 provides a graphical representation of these steps.

Summary

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Figure 6-3. Inserting a new order with its details within a single transaction Now let s look at the previous mechanism in action. For that, you will need to connect to your database server as the usrsample user and execute the statements discussed next. In MySQL, you start with explicitly opening a transaction by issuing the following statement: START TRANSACTION; In Oracle, the transaction will be started implicitly, without you doing a thing. Next, you might want to take a look at the amount of the book copies for each book stored in the books table. This can be done with the following statement: SELECT isbn, quantity FROM books;

Figure 5-13. A document with an attachment You ll also notice that the name of the file that is attached to the document is in fact a link. Clicking this link will display the image itself, because it is stored in the database. You can delete attachments using the small delete icon to the left of the attachment filename. You will not be asked to confirm the deletion, but it is worth noting that the attachment will not be deleted from the document until you click the Save Document link. Feel free to add some more documents to the database. For each book you add, you can have different fields if you so want. There is no strict schema to adhere to, so if you have a book that does not

Now that you have a rough idea of what JPQL is and when you might want to use it, it s time to look at what statements are supported in this query language. The list of statements supported in JPQL contains three items. A JPQL statement may be one of the following: SELECT UPDATE DELETE

This chapter covered a lot of ground, including the following topics: HTML and why semantics are important CSS, the importance of inheritance, specificity, and a few troubleshooting tips Coverage of some of the JavaScript basics The DOM, how to access elements and attributes, how to add new content into the DOM, and event handling In the next chapter, you ll jump into object-oriented concepts and techniques with JavaScript. This builds on much of what you ve seen here, explains some of the different techniques used so far, and goes into some more advanced JavaScript. You ll see some techniques that have really gained popularity because of many of the JavaScript frameworks that are available.

have an e-book version and hence has no e-book price, you do not need to include that field in the document. Figure 5-14 shows how my books database looks, after I added some more book documents.

CHAPTER 11 USING JAVA PERSISTENCE QUERY LANGUAGE (JPQL)

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