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If the target of a reference is not in the persistent store, then the target is For conditional expressions containing , EJB QL uses the semantics defined by SQL92 Briefly, these semantics are as follows: If a comparison or arithmetic operation has an unknown value, it yields a value value during evaluation, it returns a If a path expression contains a value test converts a persistent field or a single-valued rela The tionship field to The test converts them to Boolean operators and conditional tests use the three-valued logic defined , F for , by the following tables (In these tables, T stands for and U for unknown) Table 8 6

raise NetworkError("Cannot find host")

4

When raising an exception, the optional values supplied with the raise statement are used as the arguments to the exception s class constructor Most of the time, this is simply a string indicating some kind of error message However, user-defined exceptions can be written to take one or more exception values as shown in this example:

class DeviceError(Exception): def _ _init_ _(self,errno,msg): selfargs = (errno, msg) selferrno = errno selferrmsg = msg # Raises an exception (multiple arguments) raise DeviceError(1, 'Not Responding')

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In EJB QL, only values of the same type can be compared However, this rule has one exception: Exact and approximate numeric values can be compared In such a comparison, the required type conversion adheres to the rules of Java numeric promotion EJB QL treats compared values as if they were Java types, not as if they represented types in the underlying data store For example, if a persistent field could be either an integer or a , then it must be designated as an object, not as an primitive This designation is required because a Java object can be but a primitive cannot Two strings are equal only if they contain the same sequence of characters Trailing blanks are significant; for example, the strings and are not equal Two entity beans of the same abstract schema type are equal only if their primary keys have the same value

When you create a custom exception class that redefines _ _init_ _(), it is important to assign a tuple containing the arguments to _ _init_ _() to the attribute selfargs as shownThis attribute is used when printing exception traceback messages If you leave it undefined, users won t be able to see any useful information about the exception when an error occurs Exceptions can be organized into a hierarchy using inheritance For instance, the NetworkError exception defined earlier could serve as a base class for a variety of more specific errors Here s an example:

Avoid solving problems that have already been solved Reuse existing code whenever possible Use existing libraries and frameworks whenever possible Learn about design patterns, and use them when appropriate

def error1(): raise HostnameError("Unknown host") def error2(): raise TimeoutError("Timed out") try: error1() except NetworkError as e: if type(e) is HostnameError: # Perform special actions for this kind of error

In this case, the except NetworkError statement catches any exception derived from NetworkErrorTo find the specific type of error that was raised, examine the type of the execution value with type() Alternatively, the sysexc_info() function can be used to retrieve information about the last raised exception

clause defines the types of the objects or values returned by the clause has the following syntax:

Proper management of system resources such as files, locks, and connections is often a tricky problem when combined with exceptions For example, a raised exception can cause control flow to bypass statements responsible for releasing critical resources such as a lock The with statement allows a series of statements to execute inside a runtime context that is controlled by an object that serves as a context manager Here is an example:

with open("debuglog","a") as f: fwrite("Debugging\n") statements fwrite("Done\n") import threading lock = threadingLock() with lock: # Critical section statements # End critical section

No matter how good of a designer you are, you will not get the design just right the first time3 Recognize that there will be problems in the design, and fix them as soon as possible Fixing problems will ultimately result in a better software system that is easier to modify and maintain Learn about and use refactoring

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