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You ve been working with simple models where there s no need to have some things be optional, and so Django s default behavior to make the field required when entering data through a form in the admin interface and to create a NOT NULL column in the database has been fine In this case, though, you need to make the excerpt field optional, and the blank=True option tells Django that it s okay not to enter anything for this field You can add blank=True to any type of field in a Django model..

When the server is registered in the IDE, the JDBC drivers for the bundled database server are added to the Database Explorer Based on a use case such as this, you should start to think about ways of allowing this to happen in the API Let s call such a description of the actual steps that need to be done in the API a scenario A scenario is in fact an answer to the question stated by the use case The use case asks, How do I do this and the scenario answers, Well, you need to do this and that, and then you are done As an example, let s see the answer to the use case for registering the JDBC driver: The drivers are registered by making calls on JDBCDriverManager or by registering an XML file which describes the driver in the module layer.

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If you want your Arduino to display information on a screen and let you select or control it by touch, you ll have to do a bit more work to set up the LCD that goes behind the touch screen overlay Even on its own, though, a touch screen is a very handy device They re very thin and can be mounted over the top of any flat surface, not just an LCD, so they re great for creating little custom control panels with the buttons printed on a sheet that goes behind the touch screen All you have to do is map the buttons to X/Y coordinates and your Arduino can figure out which button is being pressed by matching the coordinates Of course, your control panel could represent anything, not just buttons.

The XML file is described by the JDBC Driver DTD An example of a registration file describing the JDBC driver for PostgreSQL follows:.

You could have a slider on it to select volume or temperature level by touching somewhere along a scale, or it could be a plan of a house so you can control lights in different rooms by touching the correct part of the floor plan In this project, we mount a Nintendo DS touch screen on a blank electrical wall plate to create a touch-sensitive control panel that can link to a home automation system The techniques we describe here should work with pretty much any four-wire resistive touch screen available, but note that some touch screens are also made using other technologies, such as capacitive and infrared, so make sure the screen you buy is definitely a resistive model The required parts are shown in Figure 8-1, and the schematic is in Figure 8-2..

Django actually uses two separate options to handle required and nonrequired fields on models: blank and null. The blank option only affects forms displayed to users of a Django-powered application and will prevent the form from displaying a validation error if no value is entered. The null option, on the other hand, will set up the database to accept a NULL value. If you need to allow users to leave a field blank and have a NULL inserted into its column in the database, you ll need to specify both options. If this seems strange, keep in mind that there are very common cases where you ll want to allow a user to leave a field blank in a form (or even hide a field entirely) but still prevent a NULL value from going to the database (by generating a value for that field if the user doesn t supply one). You ll see an example later in this chapter. Also, it s important to note that for text-based field types (CharField, TextField, and others) Django will never insert a NULL. For these field types, a blank value will be inserted as an empty string. This is to avoid a situation where there are potentially two different blank values for the field (either an empty string or a NULL) and to ensure that code that checks for blank values can be kept simple. Because of this, you should generally avoid specifying null=True on text-based field types.

<!DOCTYPE driver PUBLIC '-//NetBeans//DTD JDBC Driver 1.0//EN' 'http://www.netbeans.org/dtds/jdbc-driver-1_0.dtd' >

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