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Before you can actually run your script, you must make it executable: $ chmod a+x hello.py Now it can be run like this (assuming that you have the current directory in your path): $ hello.py If this doesn t work, try using ./hello.py instead, which will work even if the current directory (.) is not part of your execution path. If you like, you can rename your file and remove the py suffix to make it look more like a normal program.

public class SimpleDataSourceFactory implements DataSourceFactory { private DataSource dataSource; public void initialize(Map map) {

<select id="getChildCategories" parameterClass="Category" resultClass="Category"> SELECT * FROM category <dynamic prepend="WHERE "> <isNull property="parentCategoryId"> parentCategoryId IS NULL </isNull> <isNotNull property="parentCategoryId"> parentCategoryId=#parentCategoryId# </isNotNull> </dynamic> </select>

In Windows, the suffix (.py) is the key to making your script behave like a program. Try doubleclicking the file hello.py you saved in the previous section. If Python was installed correctly, a DOS window appears with the prompt What is your name Cool, huh 10 (You ll see how to make your programs look better, with buttons, menus, and so on, later.) There is one problem with running your program like this, however. Once you ve entered your name, the program window closes before you can read the result. The window closes when the program is finished. Try changing the script by adding the following line at the end: raw_input("Press <enter>")

SandwichOrders : {Text*};

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In listing 8.3, we use Dynamic SQL to build a WHERE clause for our select statement that looks at the parentCategoryId property and builds the SQL based on it.

Binary tags compare the value of a parameter property to another value or parameter property. The body content is included if the result of the comparison is true. All binary tags share the property compareProperty as well as compareValue attributes. The property attribute serves as the primary value to be compared against, while compareProperty and compareValue serve as the secondary compare values. The compareProperty attribute specifies a property of the parameter object that will contain a value used to compare against the primary value. compareValue specifies a static value that will be used to compare against the primary value. The name of the tag indicates how the values should be compared. The tag attributes are shown in table 8.2.

10. This behavior depends on your operating system and the installed Python interpreter. If you ve saved the file using IDLE in Mac OS X, for example, double-clicking the file will simply open it in the IDLE code editor.

Table 8.2 Binary tag attributes The property of the parameter used to compare against the compareValue or compareProperty. This value is used to prepend to the tag s resulting body content. The prepend value will not be prepended (a) when the tag s resulting body content is empty; (b) if the tag is the first to produce body content and is nested in a tag with the removeFirstPrepend attribute set to true; or (c) if the tag is the first to produce body content following a <dynamic> tag with a prepend attribute value that is not empty. This value is used to prefix to the tag s resulting body content. The open value will not be prefixed if the tag s resulting body content is empty. The open value is prefixed before the prepend attribute s value is prefixed. For example, if prepend="OR " and open="(" then the resulting combined prefix would be "OR (". The close value is used to append to the tag s resulting body content. The append value will not be appended if the tag s resulting body content is empty. This value defines whether the first nested content-producing tag will have its prepend value removed (optional). This value names a property on the parameter object to compare against the property named by the property attribute. This static comparison value is compared against the property named by the property attribute.

Figure 2-30. The T-SQL preview pane (right) now shows the T-SQL code generated by adding the extent definition.

Listing 2-3. Sequence (String) Multiplication Example # Prints a sentence in a centered "box" of correct width # Note that the integer division operator (//) only works in Python # 2.2 and newer. In earlier versions, simply use plain division (/)

property (required) prepend (optional)

open (optional)

sentence = raw_input("Sentence: ") screen_width text_width box_width left_margin print print print print print print print = = = = 80 len(sentence) text_width + 6 (screen_width - box_width) // 2

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