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For those readers who are familiar with Java, the preceding program should seem very straightforward. We now provide a brief explanation of how the program works for the benefit of programmers who are not familiar with Java (or object-oriented programming or networking, for that matter).4 In our explanation, we repeat relevant parts of the code so that you do not have to keep flipping pages. We start with the program s main() method: 124 125 126 127 128 129 130 131 132 } /* This method is called when the program is run from the command line. */ public static void main (String argv[]) throws Exception { /* Create a SimpleWebServer object and run it. */ SimpleWebServer sws = new SimpleWebServer(); sws.run(); }

Add this to the top of the tag controller instead of the current NewTagForm schema: import re class UniqueTag(formencodevalidatorsFancyValidator): def _to_python(self, value, state): # Check we have a valid string first value = formencodevalidatorsString(max=20)to_python(value, state) # Check that tags are only letters, numbers, and the space character result = recompile("[^a-zA-Z0-9 ]")search(value) if result: raise formencodeInvalid("Tags can only contain letters, numbers and spaces", value, state) # Ensure the tag is unique tag_q = metaSessionquery(modelTag)filter_by(name=value) if requesturlvars['action'] == 'save': # Ignore the existing name when performing the check tag_q = tag_qfilter(modelTagid != int(requesturlvars['id'])) first_tag = tag_qfirst() if first_tag is not None: raise formencodeInvalid("This tag name already exists", value, state) return value class NewTagForm(formencode.

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toString() + ((c<cols-1) "\t":""); qDebug() << temp; } In the previous listings, you passed the entire SQL query as an entire string This might work for simple queries, but it might be a problem as soon as you start adding user input to the query For example, if the user supplied the lastname string in Listing 13-3, you would have a problem if the name contained a single quote mark (') It can also be an issue handling floating-point values because the decimal character differs between locales The solution to these problems is to bind the values used in the query in a preparation stage before the query is executed Listing 13-5 shows how this is done for an INSERT query The preparation of a query, which is an optional step, might consist of a syntax check for some databases, while others will fail at execution.

Schema): allow_extra_fields = True filter_extra_fields = True name = UniqueTag(not_empty=True) There s quite a lot going on in the UniqueTag validator, so let s go through what it does When the validator is called, the first thing that happens is a check to ensure the tag name is a valid string with 20 characters If the check passes, a regular expression is used to ensure that only alphanumerics and the space character are used in the name Next, a SQLAlchemy query object is set up to query any tags with a name equal to the name being validated What happens next depends on whether the validator is used in the save() action decorator or the create() action decorator You ll.

4. If you are not so familiar with object-oriented programming, the term method used in the following discussion is almost equivalent to function.

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