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Listing 10.1 defines a DAO context named example b that will use SQL Maps C for managing transactions (which were covered in chapter 7) and contains a single Account DAO D. In the next section, we ll look more closely at this file s contents, so if you are not totally clear on it, that is OK. Creating the DaoManager Next, you need to create a DaoManager instance (which is analogous to JDBC s DataSource as the starting point of our data access layer) from which you can get the DAO. Because building the DAO manager takes time, you will want to create an instance of it and store it in a known location for later use. In section 10.4, we look at some other ways to accomplish this; but for now, let s create a simple DaoService class that will create and store our DaoManager instance for us (see listing 10.2).

The strip method returns a string where whitespace on the left and right (but not internally) has been stripped (removed): >>> ' internal whitespace is kept 'internal whitespace is kept' '.strip()

package org.apache.mapper2.examples.chapter10.dao; import import import import import com.ibatis.dao.client.DaoManager; com.ibatis.dao.client.DaoManagerBuilder; com.ibatis.common.resources.Resources; java.io.Reader; java.io.IOException;

public class DaoService { private static DaoManager daoManager; public static synchronized DaoManager getDaoManager(){ String daoXmlResource = "dao.xml"; Specifies location Reader reader; of config file if (null == daoManager){ try { Gets a reader for reader = the builder Resources.getResourceAsReader(daoXmlResource); daoManager = DaoManagerBuilder.buildDaoManager(reader); Builds DAO return daoManager; manager } catch (IOException e) { throw new RuntimeException( "Unable to create DAO manager.", e); } } else { return daoManager; } }

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Figure 4-18. Options for displaying the PartOfComponent data As an example, Figure 4-19 shows how the last column is displayed when you choose the diagram view. The options available for displaying a column s data depend on the type of data included for that particular field or column. Hence the PartOfComponent field has the diagram option available, since components have parent/child relationships to other components or subsystems. Using the diagram option for, say, the Description field wouldn t be a good choice, and, in fact, isn t available in the context menu for this column.

As with lower, strip can be useful when comparing input to stored values. Let s return to the user name example from the section on lower, and let s say that the user inadvertently types a space after his name: >>> names = ['gumby', 'smith', 'jones'] >>> name = 'gumby ' >>> if name in names: print 'Found it!' ... >>> if name.strip() in names: print 'Found it!' ... Found it! >>> You can also specify which characters are to be stripped, by listing them all in a string parameter: >>> '*** SPAM * for * everyone!!! ***'.strip(' *!') 'SPAM * for * everyone' Stripping is performed only at the ends, so the internal asterisks are not removed. In Appendix B: lstrip, rstrip.

public static Dao getDao(Class interfaceClass){ return getDaoManager().getDao(interfaceClass); } }

We will look briefly at this listing, because it does have some bits of code that will prove relevant later. The first in order of importance is the daoXmlResource variable b, which contains the location of the dao.xml file we saw in listing 10.1 earlier. That is important because it is not a path, but rather a resource location on the classpath. For example, if you are working on a web application, it would be in the WEB-INF/classes directory. The Resources class C searches the classpath for that file, and then we pass it as a Reader to the DaoManagerBuilder D to get our DaoManager instance. Now, for our DAO, we can simply call this:

Similar to replace, translate replaces parts of a string, but unlike replace, translate works only with single characters. Its strength lies in that it can perform several replacements simultaneously, and can do so more efficiently than replace. There are quite a few rather technical uses for this method (such as translating newline characters or other platform-dependent special characters), but let s consider a simpler (although slightly more silly) example. Let s say you want to translate a plain English text into one with a German accent. To do this, you must replace the character c with k, and s with z.

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