android java qr code generator B C Here we are creating our Event and in Java

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B C Here we are creating our Event and
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Location objects and populating them with some sample data. In a typical application, the user might create and populate these objects via a GUI or web interface. In any case, since you are just working with JavaBeans, the choice of how you get data into them is left to you, the application developer.
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Building tables with Ant and SchemaExport
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We also use a helper method to create a specific date, in this case December 1, 2004. Hiding the slightly complex creation of dates away in a helper method makes the main code easier to read.3
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D Associating an E Building the
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and a Location is the point of the exercise, and isn t any harder than setting other simple properties in B and C.
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Event
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SessionFactory this way looks for a resource hibernate.cfg.xml at the root of the classpath. We save the location first, and then the event. As long as we save both before calling session.flush(), Hibernate will correctly associate them. Calling flush() and committing the transaction causes Hibernate to generate SQL that inserts an Event and a Location into the database.
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F The final necessary step performs resource cleanup and exception handling. Here we roll back any changes we made, if a HibernateException was thrown while saving our objects. Last but not least, we clean up all the resources we opened, including the Session and SessionFactory. If you run this code, you should have two new rows in your database. There will be one row in the events table and one in the locations table, linked by a foreign key, location_id. The only catch is that you don t have those tables in your events_calendar database yet. So before you can run your EventLoader, you need to create those tables. We ll do that next.
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4.2 Building tables with Ant and SchemaExport
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Adding tables is a common task when you are working with a database. It should be fairly trivial to issue a few CREATE TABLE statements against your database. However, beware of drifting along the dangerous path of duplication. You have already created your Event class,
Java s Calendar and Date classes are notoriously non-user-friendly, especially for simple and common tasks like creating a specific date in time. The non-intuitiveness includes using 0-based months, which makes December month #11.
Associations and components
with its name field, and a mapping document, which again has a name field. Why should you have to create yet a third file with the SQL statement to create the events table Considering that Hibernate is already generating SQL to do inserts, updates, and deletes, surely it can give you a hand here in creating tables as well. Thankfully, it can. To that end, Hibernate includes an Ant task, SchemaExport, which will examine your mapping files, persistent classes, and hibernate.cfg.xml file, and generate the tables for you. Adding it to your build.xml file also means you can drop and re-create the database very easily. You are going to update the build.xml file you saw in chapters 2 and 3, and add a SchemaExport task to build your database quickly (listing 4.7). In addition, you will modify the file to run your EventLoader class. Listing 4.7 The build4.xml file with a SchemaExport task that builds the tables Hibernate needs
<project name="build4.xml" default="build"> <property name="src.java.dir" value="src/java"/> <property name="build.classes.dir" value="build/classes"/> <property name="hibernate.version" value="3.0"/> <property name="mysql.jdbc.version" value="3.1.7"/> <property name="applications.dir" location="/applications"/> <property name="hibernate.lib.dir" value="${applications.dir}/hibernate-${hibernate.version}"/> <property name="jdbc.driver.jar" value="${applications.dir}/mysql-connector-java${mysql.jdbc.version}/mysql-connector-java${mysql.jdbc.version}-bin.jar" /> Specifies location of <import file="hibernate-build.xml" />
JAR with MySQL s database driver
<path id="project.classpath"> <pathelement location="${build.classes.dir}"/> Indicates new classpath with all the </path> needed JARs and Hibernate files <path id="runtime.classpath"> <path refid="project.classpath"/> Includes compiled <path refid="hibernate.lib.path"/> .class files
Building tables with Ant and SchemaExport
<pathelement location="${jdbc.driver.jar}"/> <pathelement location="${src.java.dir}" /> </path> Adds mapping files to the classpath <target name="clean"> <delete dir="${build.classes.dir}"/> Includes MySQL </target> driver specified above <target name="init"> <mkdir dir="${build.classes.dir}"/> </target> <target name="compile" depends="init" > <javac srcdir="${src.java.dir}" destdir="${build.classes.dir}"> <classpath refid="hibernate.lib.path"/> </javac> </target> <target name="build" depends="compile" > <java classname="com.manning.hq.ch04.EventLoader"> <classpath refid="runtime.classpath"/> </java> Runs EventLoader class, using newly defined classpath </target> <target name="schema-export" depends="compile" > <taskdef name="schemaexport" classname="org.hibernate.tool.hbm2ddl.SchemaExportTask"> <classpath refid="runtime.classpath" /> Defines SchemaExport task </taskdef> <schemaexport config="${src.java.dir}/hibernate.cfg.xml"/> </target> </project> Builds database schema
This is mostly the same as the previous chapter s build file, so let s focus on what has changed: You defined a new classpath, which you use in several places throughout the build file. One of the places it is used is the SchemaExport task, so you need to specify a few essential elements, including
The compiled persistent classes, Event.class and Location.class files. The Hibernate library JAR files.
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