TestData

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How to generate random test data for your database.

dbMonster is a tool which helps database application developers with tuning the structure of the database, tuning the usage of indexes, and testing the application performance under heavy database load. dbMonster generates as much random test data as you wish and puts it into SQL database. I used dbMonster to add several thousand users to appfuse to test how it will impact performance, especially displaytag peformance.

First you want to download dbmonster (dbmonster-core and dbmonster-ant)

Create 2 new directories inside of dbmonster-core-1.0.3 called config and schema.

mkdir config
mkdir schema

Create a file called dbmonster.properties inside of the config directory you just made.

dbmonster.jdbc.driver=org.postgresql.Driver
dbmonster.jdbc.url=jdbc:postgresql://127.0.0.1/YourDatabase
dbmonster.jdbc.username=postgres
dbmonster.jdbc.password=YourPassword

dbmonster.max-tries=1000

dbmonster.rows=1000

dbmonster.progress.monitor=pl.kernelpanic.dbmonster.ProgressMonitorAdapter

Next you want to map the schema of the tables that you want to generate data for. To do this, you will make a new file called appfuse-schema.xml. This example will allow you to generate 1500 new users at a time. If you want more you can run the application more than one or change rows="1500" in the file below.

<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE dbmonster-schema PUBLIC
    "-//kernelpanic.pl//DBMonster Database Schema DTD 1.1//EN"
    "http://dbmonster.kernelpanic.pl/dtd/dbmonster-schema-1.1.dtd">

<dbmonster-schema>
        <name>User Schema</name>
                <table name="app_user" rows="1500">
                        <!--
                        <key databaseDefault="false">
                                <generator type="pl.kernelpanic.dbmonster.generator.MaxKeyGenerator"
                                        <property name="columnName" value="id"/>
                                </generator>
                        </key>
                        -->
                        <column name="username">
                                <generator type="pl.kernelpanic.dbmonster.generator.StringGenerator">
                                        <property name="nulls" value="0"/>
                                        <property name="minLength" value="4"/>
                                        <property name="maxLength" value="15"/>
                                        <property name="allowSpaces" value="false"/>
                                </generator>
                        </column>
                        <column name="version">
                                <generator type="pl.kernelpanic.dbmonster.generator.NumberGenerator">
                                        <property name="nulls" value="0"/>
                                        <property name="minValue" value="1"/>
                                        <property name="maxValue" value="5"/>
                                        <property name="returnedType" value="integer"/>
                                </generator>
                        </column>
                        <column name="password">
                                <generator type="pl.kernelpanic.dbmonster.generator.StringGenerator">
                                        <property name="nulls" value="0"/>
                                        <property name="minLength" value="4"/>
                                        <property name="maxLength" value="15"/>
                                        <property name="allowSpaces" value="false"/>
                                </generator>
                        </column>
                        <column name="first_name">
                                <generator type="pl.kernelpanic.dbmonster.generator.StringGenerator">
                                        <property name="nulls" value="0"/>
                                        <property name="minLength" value="4"/>
                                        <property name="maxLength" value="15"/>
                                        <property name="allowSpaces" value="false"/>
                                </generator>
                        </column>
                        <column name="last_name">
                                <generator type="pl.kernelpanic.dbmonster.generator.StringGenerator">
                                        <property name="nulls" value="0"/>
                                        <property name="minLength" value="4"/>
                                        <property name="maxLength" value="15"/>
                                        <property name="allowSpaces" value="false"/>
                                </generator>
                        </column>
                        <column name="city">
                                <generator type="pl.kernelpanic.dbmonster.generator.StringGenerator">
                                        <property name="nulls" value="0"/>
                                        <property name="minLength" value="4"/>
                                        <property name="maxLength" value="15"/>
                                        <property name="allowSpaces" value="false"/>
                                </generator>
                        </column>
                        <column name="postal_code">
                                <generator type="pl.kernelpanic.dbmonster.generator.NumberGenerator">
                                        <property name="nulls" value="0"/>
                                        <property name="minValue" value="10000"/>
                                        <property name="maxValue" value="77007"/>
                                        <property name="returnedType" value="integer"/>
                                </generator>
                        </column>
                        <column name="email">
                                <generator type="pl.kernelpanic.dbmonster.generator.StringGenerator">
                                        <property name="nulls" value="0"/>
                                        <property name="minLength" value="4"/>
                                        <property name="maxLength" value="15"/>
                                        <property name="allowSpaces" value="false"/>
                                </generator>
                        </column>


                </table>
</dbmonster-schema>

Configure Ant

You should put your build.properties and build.xml in the same directory that dbmonster-ant-1.0.1.jar is at.

Here are the contents of build.properties.

<project name="dbmonster task example" default="gendb" basedir=".">

  <property file="build.properties"/>

  <!-- setup classpath -->
  <path id="dbmonster.classpath">
    <fileset dir="${dbmonster.ant}">
      <include name="*.jar"/>
    </fileset>
    <fileset dir="${dbmonster.home}">
      <include name="**/*.jar"/>
    </fileset>
  </path>

  <taskdef
    name="dbmonster"
    classname="pl.kernelpanic.dbmonster.ant.DBMonsterTask"
    classpathref="dbmonster.classpath">
  </taskdef>

  <target name="gendb">
    <dbmonster
      config="${dbmonster.config}/dbmonster.properties" verbose="true">
      <fileset dir="${dbmonster.schemas}">
        <include name="*.xml"/>
      </fileset>
    </dbmonster>
  </target>
</project>

Run Ant

After you have done the above, make sure your database is started and try running ant.

That was easy!: