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Figure 4-4. M code for a simple car model Let s walk through the code line by line: Line 1: module Car.Model All M code must be contained within a named module, which is the top-level namespace in the M language. It helps to give a meaningful name to the module that more or less conveys its intent. Line 3: export CarComponent, CarComponents This makes the CarComponent and CarComponents entities visible and available to other modules. These are the only two declarations in this particular module: the type CarComponent and the extent (or table, in SQL-speak) CarComponents, which is a collection of the CarComponent entities. You could also import declarations from other modules, but this isn t necessary in this particular example, since the module stands by itself. Line 6: type CarComponent Here you are declaring that the type definition for CarComponent follows inside the braces. A CarComponent type is defined with the following named structure: Id: An Integer64 (64-bit integer) that is set by the AutoNumber() function. AutoNumber() is normally used for defining the Id (or key) of a new entity. It is a system-provided function that automatically assigns a unique incremental number to the Id, or key, each time a new entity is instantiated. Name: Defined as unrestricted text. Name is an important attribute when defining a new type or entity, since it is, by convention, used as the tag for the entity. Level: An Integer32. This is the system level of the component. The top system level is 1 and defines the level of the entire system, named My Car.

Using <flushOnExecute> will not be an effective strategy if the underlying data has long since expired because another application has made changes to your database You can still take advantage of caching the more static read-only data that will not impact your read/write data Examples include time-based report data that does not change, shopping cart page data, or static drop-down list data On the other hand, if you are caching for a database that is accessed only through a single application, you can be much more aggressive about your use of iBATIS caching In a dedicated application, <flushOnExecute> becomes much more valuable You know that the execution of certain mapped statements will force cached data to be invalid and therefore can affect your flush strategies Suppose you want more granular control over when certain items are released from the cache, or you want a clustered cache.

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Before the width and precision numbers, you may put a flag, which may be either zero, plus, minus, or blank. A zero means that the number will be zero-padded: >>> '%010.2f' % pi '0000003.14' It s important to note here that the leading zero in 010 in the preceding code does not mean that the width specifier is an octal number, as it would in a normal Python number. When you use 010 as the width specifier, it means that the width should be 10 and that the number should be zero-padded, not that the width should be 8: >>> 010 8 A minus sign (-) left-aligns the value: >>> '%-10.2f' % pi '3.14 ' As you can see, any extra space is put on the right-hand side of the number. A blank ( ) means that a blank should be put in front of positive numbers. This may be useful for aligning positive and negative numbers: >>> print ('% 5d' % 10) + '\n' + ('% 5d' % -10)F 10 -10 Finally, a plus (+) means that a sign (either plus or minus) should precede both positive and negative numbers (again, useful for aligning): >>> print ('%+5d' % 10) + '\n' + ('%+5d' % -10) +10 -10

IBATIS by itself provides no means of caching in this manner, but it can be combined with the OSCACHE cache type (section 954) to provide this type of robust functionality However, the same rules apply here as stated earlier You can be much more aggressive about your use of caching when you know that access to your database is limited to one application But exercise caution when your application is not the dedicated access to the database In the next few sections, we look at some case studies of cache use, as well as some code snippets that illustrate how to get started implementing them..

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