Step 1: Configuring the Torque generation process
The following section outlines the necessary steps to configure a Torque-based ORM project using Maven. For this, you need to create maven's pom file (the maven project descriptor file) which describes your project. It is recommended to run the tutorial against a Mysql database, as all of the explanation in this tutorial assumes that you use Mysql.
As a starting point, create a directory as a base directory for your project (also called the project's top level directory). All the paths in the following steps will be relative to this base directory.
Maven Project descriptor
As a starting point for the pom file in your project, use the following template and save it as pom.xml in the project's base directory. Then edit it to reflect your specific needs ( typically you need to change the database URLs, the database host, the database user and password):
<?xml version="1.0"?>
<project
xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.apache.torque.tutorial</groupId>
<artifactId>torque-test</artifactId>
<packaging>jar</packaging>
<name>Torque Tutorial Test Project</name>
<version>1.0-SNAPSHOT</version>
<dependencies>
<!-- Torque runtime -->
<dependency>
<artifactId>torque-runtime</artifactId>
<groupId>org.apache.torque</groupId>
<version>5.0</version>
</dependency>
<!-- db driver -->
<dependency>
<artifactId>mysql-connector-java</artifactId>
<groupId>mysql</groupId>
<version>8.0.21</version>
</dependency>
<!-- Logging via log4j2 -->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j-impl</artifactId>
<version>2.13.3</version>
<scope>runtime</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.torque</groupId>
<artifactId>torque-maven-plugin</artifactId>
<version>5.0</version>
<executions>
<execution>
<id>generate-sources</id>
<phase>generate-sources</phase>
<goals>
<goal>generate</goal>
</goals>
<configuration>
<packaging>classpath</packaging>
<configPackage>org.apache.torque.templates.om</configPackage>
<sourceDir>src/main/schema</sourceDir>
<options>
<torque.om.package>org.apache.torque.tutorial.om</torque.om.package>
<torque.database>mysql</torque.database>
</options>
</configuration>
</execution>
<execution>
<id>generate-sql</id>
<phase>generate-sources</phase>
<goals>
<goal>generate</goal>
</goals>
<configuration>
<packaging>classpath</packaging>
<configPackage>org.apache.torque.templates.sql</configPackage>
<sourceDir>src/main/schema</sourceDir>
<defaultOutputDir>target/generated-sql</defaultOutputDir>
<defaultOutputDirUsage>none</defaultOutputDirUsage>
<options>
<torque.database>mysql</torque.database>
</options>
</configuration>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>org.apache.torque</groupId>
<artifactId>torque-templates</artifactId>
<version>5.0</version>
</dependency>
</dependencies>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>sql-maven-plugin</artifactId>
<version>1.4</version>
<configuration>
<driver>com.mysql.cj.jdbc.Driver</driver>
<url>jdbc:mysql://localhost:3306/bookstore</url>
<username>root</username>
<password>password</password>
<onError>continue</onError>
<autocommit>true</autocommit>
<fileset>
<basedir>${basedir}/target/generated-sql</basedir>
<includes>
<include>*.sql</include>
</includes>
</fileset>
</configuration>
<dependencies>
<dependency>
<artifactId>mysql-connector-java</artifactId>
<groupId>mysql</groupId>
<version>8.0.21</version>
</dependency>
</dependencies>
</plugin>
<plugin>
<!-- setting java version to 1.8 -->
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<id>copy-dependencies</id>
<phase>package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>libs</outputDirectory>
<includeScope>runtime</includeScope>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
This template contains the following definitions:
- The runtime dependencies of your project to Torque in the main dependencies section of the pom (needed when you compile and use the generated java sources)
- The configuration of the Torque maven 2 plugin in the plugins section
- The configuration of the maven SQL plugin in the plugins section (needed if you want to execute the generated SQL using maven)
- The configuration of the java compiler in the plugins section to allow java 1.8 code (needed when you compile the generated java sources)
- The configuration of the maven dependency plugin in the plugins section (gathers all dependency libraries of the project).
Configuring Maven 2 correctly is very important. This enables the Torque generator to generate all of the required sources and SQL for your specific database. If you experience problems later in this tutorial, it would be wise to double-check this file.
Where to next
This completes the configuration of the Torque Maven 2 plugin (and other settings to be made in the pom.xml).
Next we will look at Defining the database schema.