vb.net code to print barcode iBATIS in five minutes in Java

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iBATIS in five minutes
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Listing 2.4
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Main.java
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import com.ibatis.sqlmap.client.*; import com.ibatis.common.resources.Resources; import java.io.Reader; import java.util.List;
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public class Main { public static void main(String arg[]) throws Exception { String resource = "SqlMapConfig.xml"; Reader reader = Resources.getResourceAsReader (resource); SqlMapClient sqlMap = SqlMapClientBuilder.buildSqlMapClient(reader); List list = sqlMap.queryForList("getAllUsers", "EMPLOYEE"); System.out.println("Selected " + list.size() + " records."); for(int i = 0; i < list.size(); i++) { Prints the results System.out.println(list.get(i)); } Executes the statement } }
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Configures iBATIS
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That s it! We ve configured iBATIS, executed the statement, and printed the results in about 10 lines of Java code. That s all the Java code required for a fully functional iBATIS application. Later, we will refine how things happen, but for now, let s move on to the basics of the configuration.
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2.5.3 Configuring iBATIS (a preview)
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Since we cover the configuration of iBATIS in depth in the next chapter, we discuss it only briefly here. You won t find much in the way of explanation of the options here, but we cover the essential information. First, let s look at the SqlMapConfig.xml file. This is the starting point for iBATIS, and ties all of the SQL Maps together. Listing 2.5 contains the SqlMapConfig.xml file for our simple application.
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Listing 2.5 The SQL map configuration for the simplest iBATIS application ever written
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< xml version="1.0" encoding="UTF-8" > <!DOCTYPE sqlMapConfig PUBLIC "-//ibatis.apache.org//DTD SQL Map Config 2.0//EN" "http://ibatis.apache.org/dtd/sql-map-config-2.dtd"> <sqlMapConfig> <transactionManager type="JDBC" >
Provides DOCTYPE and DTD for validation
What is iBATIS
<dataSource type="SIMPLE"> <property name="JDBC.Driver" value="com.mysql.jdbc.Driver"/> <property name="JDBC.ConnectionURL" Provides name of value="jdbc:mysql://localhost/test"/> built-in transaction <property name="JDBC.Username" manager value="root"/> <property name="JDBC.Password" value="blah"/> </dataSource> </transactionManager> <sqlMap resource="SqlMap.xml" /> Provides your SQL Maps </sqlMapConfig>
As you may have guessed, this is where we tell iBATIS how to connect to the database and which SQL Map files are available. Since it is an XML document, we need to provide a doctype and DTD for validation B. SIMPLE is the name of a built-in transaction manager C. Here is where you provide the name of your JDBC driver, the JDBC URL, a username, and a password that lets you connect to the database. Then you provide your SQL Maps D. Here, we only have one SQL Map, but you can have as many as you want. There are a few other things you can do here, but we cover them all in the next chapter. Now that you have seen the main configuration file, let s take a look at the SqlMap.xml file (listing 2.6). This is the file that contains the SQL statement that we will be running.
Listing 2.6 The simplest SQL Map ever
< xml version="1.0" encoding="UTF-8" > <!DOCTYPE sqlMap PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN" "http://ibatis.apache.org/dtd/sql-map-2.dtd"> <sqlMap> <select id="getAllUsers" parameterClass="string" resultClass="hashmap"> SELECT * FROM USER_ACCOUNT WHERE GROUPNAME = #groupName# </select> </sqlMap>
In the XML code in listing 2.6, we re accepting a String parameter (parameterClass) for the GROUPNAME parameter, and mapping the results (resultClass) to a HashMap.
iBATIS in five minutes
WARNING
Using a Map (e.g., HashMap, TreeMap) as your domain model is not recommended, but this does show the level of mapping flexibility that iBATIS provides. You don t necessarily always need a JavaBean to map to you can map directly to Maps and primitives as well.
Believe it or not, you have now seen all of the code and configuration required to use iBATIS. We have intentionally spread it out for printing, but even with that, it is only about 50 lines of code, including Java and XML. But the more important point is that 45 of the 50 lines are configuration and are only written once in an application, not for every single statement. As you saw earlier in this chapter, JDBC can end up costing you 50 lines of code or more per statement.
2.5.4 Building the application
Usually when building a large application, you will use something like Ant to make it simpler. Because this is only one class, we are not going to bother building an Ant script for it. To build it, the only JAR files you need on the classpath are ibatis-common-2.jar and ibatis-sqlmap-2.jar, so we will just key them in on the command line to the Java compiler:
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