added lightweight h2 database (ORACLE mode) default option for easy testing and demos

Author: tsviz

.gitignore

@@ -2,4 +2,5 @@
 target/
 nohup.out
 .vscode/
-split_tests.sh
+split_tests.sh
+*.db

pom.xml

@@ -71,6 +71,12 @@
 			<version>19.3.0.0</version>
 		</dependency>
 
+		<dependency>
+			<groupId>com.h2database</groupId>
+			<artifactId>h2</artifactId>
+			<scope>runtime</scope>
+		</dependency>
+
 		<!-- <dependency>
 			<groupId>org.testng</groupId>
 			<artifactId>testng</artifactId>

src/main/resources/application.properties

@@ -1,5 +1,6 @@
-spring.datasource.url=jdbc:oracle:thin:@127.0.0.1:49161/xe
+# spring.datasource.url=jdbc:oracle:thin:@localhost:1521/xe
+spring.datasource.url=jdbc:h2:file:./testdb;Mode=Oracle
 spring.datasource.username=SYSTEM
 spring.datasource.password=oracle
-spring.liquibase.change-log=classpath:db/changelog/changelog_version-3.2.oracle.sql
+spring.liquibase.change-log=classpath:db/changelog/changelog_version-3.3.oracle.xml
 server.port=8086

src/main/resources/db/changelog/changelog_version-3.3.oracle.xml

@@ -0,0 +1,41 @@
+<databaseChangeLog xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
+                   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                   xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog
+                   http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.8.xsd">
+
+    <!--  create a sales table with id, Item name, amount, quantity, and date. Auto increment id. -->
+      <changeSet id="1" author="jim">
+         <createTable tableName="sales">
+               <column name="id" type="int" autoIncrement="true">
+                  <constraints primaryKey="true" nullable="false" />
+               </column>
+               <column name="item" type="varchar(100)" />
+               <column name="amount" type="double" />
+               <column name="quantity" type="int" />
+               <column name="date" type="date" />
+         </createTable>
+      </changeSet>
+
+      <!-- insert some data into the sales table. -->
+      <changeSet id="2" author="jim">
+         <insert tableName="sales">
+            <column name="item" value="Laptop" />
+            <column name="amount" value="1000" />
+            <column name="quantity" value="5" />
+            <column name="date" value="2020-01-01" />
+         </insert>
+         <insert tableName="sales">
+            <column name="item" value="Desktop" />
+            <column name="amount" value="1500" />
+            <column name="quantity" value="2" />
+            <column name="date" value="2020-01-02" />
+         </insert>
+         <insert tableName="sales">
+            <column name="item" value="Printer" />
+            <column name="amount" value="500" />
+            <column name="quantity" value="10" />
+            <column name="date" value="2020-01-03" />
+         </insert>
+      </changeSet>
+
+</databaseChangeLog>