SCT-59 Add Support for H2 database

resolves spring-cloud/spring-cloud-task#59

spring-cloud-task-core/pom.xml

@@ -54,8 +54,8 @@
 			<scope>test</scope>
 		</dependency>
 		<dependency>
-			<groupId>org.hsqldb</groupId>
+			<groupId>com.h2database</groupId>
-			<artifactId>hsqldb</artifactId>
+			<artifactId>h2</artifactId>
 			<scope>test</scope>
 		</dependency>
 		<dependency>

spring-cloud-task-core/src/main/java/org/springframework/cloud/task/repository/database/support/H2PagingQueryProvider.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.task.repository.database.support;
+
+import org.springframework.cloud.task.repository.database.PagingQueryProvider;
+import org.springframework.data.domain.Pageable;
+
+/**
+ * H2 implementation of a {@link PagingQueryProvider} using database specific features.
+ *
+ * @author Glenn Renfro
+ */
+public class H2PagingQueryProvider extends AbstractSqlPagingQueryProvider {
+
+	@Override
+	public String getPageQuery(Pageable pageable) {
+		String topClause = new StringBuilder().append("LIMIT ")
+				.append(pageable.getOffset()).append(" ")
+				.append(pageable.getPageSize()).toString();
+		return SqlPagingQueryUtils.generateTopJumpToQuery(this, topClause);
+	}
+
+}

spring-cloud-task-core/src/main/java/org/springframework/cloud/task/repository/database/support/SqlPagingQueryProviderFactoryBean.java

@@ -18,6 +18,7 @@ package org.springframework.cloud.task.repository.database.support;
 
 
 import static org.springframework.cloud.task.repository.support.DatabaseType.HSQL;
+import static org.springframework.cloud.task.repository.support.DatabaseType.H2;
 import static org.springframework.cloud.task.repository.support.DatabaseType.MYSQL;
 import static org.springframework.cloud.task.repository.support.DatabaseType.ORACLE;
 import static org.springframework.cloud.task.repository.support.DatabaseType.POSTGRES;
@@ -61,6 +62,7 @@ public class SqlPagingQueryProviderFactoryBean implements FactoryBean<PagingQuer
 
 	{
 		providers.put(HSQL, new HsqlPagingQueryProvider());
+		providers.put(H2, new H2PagingQueryProvider());
 		providers.put(MYSQL, new MySqlPagingQueryProvider());
 		providers.put(POSTGRES, new PostgresPagingQueryProvider());
 		providers.put(ORACLE, new OraclePagingQueryProvider());

spring-cloud-task-core/src/main/java/org/springframework/cloud/task/repository/support/DatabaseType.java

@@ -36,6 +36,7 @@ import org.springframework.util.StringUtils;
 public enum DatabaseType {
 
 	HSQL("HSQL Database Engine"),
+	H2("H2"),
 	ORACLE("Oracle"),
 	MYSQL("MySQL"),
 	POSTGRES("PostgreSQL");

spring-cloud-task-core/src/main/resources/org/springframework/cloud/task/schema-h2.sql

@@ -0,0 +1,21 @@
+
+CREATE TABLE TASK_EXECUTION  (
+	TASK_EXECUTION_ID BIGINT NOT NULL PRIMARY KEY ,
+	TASK_EXTERNAL_EXECUTION_ID VARCHAR(100) ,
+	START_TIME TIMESTAMP DEFAULT NULL ,
+	END_TIME TIMESTAMP DEFAULT NULL ,
+	TASK_NAME  VARCHAR(100) ,
+	EXIT_CODE INTEGER ,
+	EXIT_MESSAGE VARCHAR(2500) ,
+	LAST_UPDATED TIMESTAMP ,
+	STATUS_CODE VARCHAR(10)
+);
+
+CREATE TABLE TASK_EXECUTION_PARAMS  (
+	TASK_EXECUTION_ID BIGINT NOT NULL ,
+	TASK_PARAM VARCHAR(250) ,
+	constraint TASK_EXEC_PARAMS_FK foreign key (TASK_EXECUTION_ID)
+	references TASK_EXECUTION(TASK_EXECUTION_ID)
+) ;
+
+CREATE SEQUENCE TASK_SEQ ;

spring-cloud-task-samples/timestamp/pom.xml

@@ -42,8 +42,8 @@
 			<artifactId>spring-boot-starter-jdbc</artifactId>
 		</dependency>
 		<dependency>
-			<groupId>org.hsqldb</groupId>
+			<groupId>com.h2database</groupId>
-			<artifactId>hsqldb</artifactId>
+			<artifactId>h2</artifactId>
 		</dependency>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>