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Let s walk through the generated T-SQL code in the right pane of Figure 2-31 to see what s happening: Lines 1-8: This does some initial configuration stuff and begins a transaction for code sequence to follow. This transaction will be committed at the end of the sequence.

All of the attributes in table 8.4 are available in the unary dynamic SQL tags listed in table 8.5.

To check whether a value can be found in a sequence, you use the in operator. This operator is a bit different from the ones discussed so far (such as multiplication or addition). It checks whether something is true and returns a value accordingly: True for true and False for false. Such operators are called Boolean operators, and the truth values are called Boolean values. You learn more about Boolean expressions in the section on conditional statements in 5. Here are some examples that use the in operator: >>> permissions = 'rw' >>> 'w' in permissions True >>> 'x' in permissions

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Table 8.5 Unary tags Determines whether the specified property exists in the parameter. With a bean, it looks for a property. With a map, it looks for a key. Checks whether the specified property does not exist in the parameter. With a bean, it looks for a property. With a map, it looks for a key. Determines whether the specified property is null. With a bean, it looks at the value of the property getter. With a map, it looks for a key. If the key does not exist, it will return true. Determines whether the specified property is anything other than null. With a bean, it looks at the value of the property getter. With a map, it looks for a key. If the key does not exist, it will return false.

Table 8.5 Unary tags (continued) Determines whether the specified property is a null or empty String, Collection, or String.valueOf(). Determines whether the specified property is not a null or empty String, Collection, or String.valueOf().

Lines 10-17: This tests whether a LunchCounter (the name of the module) schema already exists in the database. If it doesn t, the schema is created. Lines 19-23: This section creates the SandwichOrders table with a single text field to contain the text of the order. Lines 25-28: This inserts the two sample SandwichOrders instances into the table. Lines 30-31: This commits the transaction that was initiated at the top of the code. And all of this from just a few lines of M code! It looks like the advantage provided by the SQL Server Modeling framework in terms of enabling a developer to create, refine, and maintain a domain model is significant.

False >>> users = ['mlh', 'foo', 'bar'] >>> raw_input('Enter your user name: ') in users Enter your user name: mlh True >>> subject = '$$$ Get rich now!!! $$$' >>> '$$$' in subject True The first two examples use the membership test to check whether 'w' and 'x', respectively, are found in the string permissions. This could be a script on a UNIX machine checking for writing and execution permissions on a file. The next example checks whether a supplied user name (mlh) is found in a list of users. This could be useful if your program enforces some security policy. (In that case, you would probably want to use passwords as well.) The last example checks whether the string subject contains the string '$$$'. This might be used as part of a spam filter, for example.

<select id="getProducts" parameterClass="Product" resultClass="Product"> SELECT * FROM Products <dynamic prepend="WHERE "> <isNotEmpty property="productType"> productType=#productType# </isNotEmpty> </dynamic> </select>

Note The example that checks whether a string contains '$$$' is a bit different from the others. In general,

In listing 8.5, we create a simple select mapped statement, then use a dynamic SQL tag to optionally filter the results based on the productType property.

In the next chapter, I will walk you through a much more extended exercise showing how to use Intellipad to create and refine a domain-specific language.

8.2.4 Parameter tags It is possible to define a mapped statement without a parameter. The parameter tags were created to check whether a parameter has been passed in to the mapped statement. The tag attributes are shown in table 8.6.

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