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By separating the data access implementation from the data access interface, we are able to provide a homogenous set of interfaces to heterogeneous data An application can access data from multiple databases, each with a different underlying data access mechanism using a single consistent data access API The JDBC API is just one type of DAO pattern In that realm, you have a set of interfaces, and database vendors implement them in a way that makes it possible to use them interchangeably for the most part In a few cases, where vendors feel that the interfaces do not provide the capability to do things they want to do, they work outside the interface To give you an idea of how much the DAO pattern in the JDBC API simplified its use (and yes, we really mean simplified ), take a look at a JDBC driver implementation some time.

The lower method returns a lowercase version of the string: >>> 'Trondheim Hammer Dance'.lower() 'trondheim hammer dance' This can be useful if you want to write code that is case insensitive that is, code that ignores the difference between uppercase and lowercase letters. For instance, suppose you want to check whether a user name is found in a list. If your list contains the string 'gumby' and the user enters his name as 'Gumby', you won t find it: >>> if 'Gumby' in ['gumby', 'smith', 'jones']: print 'Found it!' ... >>> Of course, the same thing will happen if you have stored 'Gumby' and the user writes 'gumby', or even 'GUMBY'. A solution to this is to convert all names to lowercase both when storing and searching. The code would look something like this: >>> name = 'Gumby' >>> names = ['gumby', 'smith', 'jones'] >>> if name.lower() in names: print 'Found it!' ... Found it! >>> See also: translate. In Appendix B: islower, capitalize, swapcase, title, istitle, upper, isupper.

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For example, one major database vendor s implementation of the five interfaces in figure 101 is composed of nine more (vendor-specific) interfaces before getting to the five classes that actually implement them (this is not counting any classes or interfaces that are outside of the lineage of the actual implementing classes) One of the authors did actually build the UML for this, and intended on putting it in here as an example, but this chapter was already too long, and we would have had to add another page Yes, it was that complex This pattern is one reason why tools like iBATIS SQL maps and O/RM tools are possible Because nearly all database vendors implement the JDBC APIs very accurately, tools can be written that operate against those interfaces instead of the underlying implementations.

One relative of lower is the title method (see Appendix B), which title cases a string that is, all words start with uppercase characters, and all other characters are lowercased. However, the word boundaries are defined in a way that may give some unnatural results: >>> "that's all folks".title() "That'S All, Folks" An alternative is the capwords function from the string module: >>> import string >>> string.capwords("that's all, folks") "That's All, Folks" Of course, if you want a truly correctly capitalized title (which depends on the style you re using possibly lowercasing articles, coordinating conjunctions, prepositions with fewer than five letters, and so forth), you re basically on your own.

For the most part, those tools will work with any vendor s implementation, and you only need to refer to the vendor s software when you create the DataSource from there on, you are working with the common API..

Figure 4-15. Adding the Drive Train subsystem Next, you ll add the Suspension subsystem. Click the title bar of the CarComponents table pane to make sure it is active , and then press Ctrl+I to bring up a new detail window. (In Quadrant, the active window will have a colored title bar, as shown in Figure 4-16, while the others will have grayed out title bars.) Enter the data for the new item, and press Ctrl+S to save the item. You can readjust the column widths in the table pane as you go along so that the descriptions and other items are always readable.

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