#671: add support for hana as dbType (#671)

add support for hana as dbType, rewview rework, #671: included review improvement suggestions

templates/server/src/main/resources/archetype-resources/core/pom.xml

@@ -143,6 +143,10 @@
       <groupId>org.mariadb.jdbc</groupId>
       <artifactId>mariadb-java-client</artifactId>
       <version>1.5.4</version>
+#elseif ($dbType == 'hana')
+      <groupId>com.sap.cloud.db.jdbc</groupId>
+      <artifactId>ngdbc</artifactId>
+      <version>2.3.48</version>
 #elseif ($dbType == 'oracle')
       <groupId>com.oracle.jdbc</groupId>
       <artifactId>ojdbc8</artifactId>

templates/server/src/main/resources/archetype-resources/core/src/main/resources/application.properties

@@ -16,6 +16,10 @@ spring.jpa.hibernate.ddl-auto=validate
 # https://github.com/spring-projects/spring-boot/blob/d3c34ee3d1bfd3db4a98678c524e145ef9bca51c/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jdbc/DatabaseDriver.java
 #if ($dbType == 'mariadb')
 spring.jpa.database=mysql
+#elseif ($dbType == 'hana')
+# Requires spring 5.1 - see https://jira.spring.io/browse/SPR-16460
+#spring.jpa.database=hana
+spring.jpa.database=default
 #else
 spring.jpa.database=${dbType}
 #end
@@ -39,6 +43,10 @@ spring.datasource.username=${rootArtifactId}
 # spring.jpa.database-platform=org.hibernate.dialect.MySQL5Dialect
 # spring.datasource.driver-class-name=org.mariadb.jdbc.Driver
 spring.datasource.username=${rootArtifactId}
+#elseif ($dbType == 'hana')
+# spring.jpa.database-platform=org.hibernate.dialect.HANAColumnStoreDialect
+# spring.datasource.driver-class-name=com.sap.db.jdbc.Driver
+spring.datasource.username=${rootArtifactId}
 #elseif ($dbType == 'oracle')
 # spring.jpa.database-platform=org.hibernate.dialect.Oracle10gDialect
 # spring.jpa.database-platform=org.hibernate.dialect.Oracle12cDialect

templates/server/src/main/resources/archetype-resources/core/src/main/resources/config/application.properties

@@ -28,6 +28,10 @@ spring.datasource.url=jdbc:mysql://address=(protocol=tcp)(host=localhost)(port=3
 #elseif ($dbType == 'mariadb')
 spring.datasource.password=todo
 spring.datasource.url=jdbc:mariadb://localhost:3306/db
+#elseif ($dbType == 'hana')
+spring.datasource.password=todo
+# https://help.sap.com/viewer/0eec0d68141541d1b07893a39944924e/latest/en-US/b250e7fef8614ea0a0973d58eb73bda8.html
+spring.datasource.url=jdbc:sap://localhost:39015
 #elseif ($dbType == 'oracle')
 spring.datasource.password=todo
 spring.datasource.url=jdbc:oracle:thin:@localhost:1521/XE

templates/server/src/main/resources/archetype-resources/core/src/main/resources/db/type/hana/V0001__Create_Sequence.sql

@@ -0,0 +1,18 @@
+-- Leave a large ID space reserved for master-data and test-data
+CREATE SEQUENCE HIBERNATE_SEQUENCE START WITH 1000000;
+
+-- hana does not support Dateadd function out of the box so we add it here to be able to use it for master-data SQLs
+CREATE FUNCTION DATEADD(IN DATETYPE NVARCHAR(256), IN NUMBER INTEGER, IN TS TIMESTAMP)
+RETURNS TSADD TIMESTAMP
+AS
+BEGIN
+  IF :DATETYPE = 'DAY'
+  THEN
+    TSADD = ADD_DAYS(:TS, :NUMBER);
+  ELSEIF :DATETYPE = 'HOUR'
+  THEN
+    TSADD = ADD_SECONDS(:TS, :NUMBER * 3600);
+  ELSE
+    SIGNAL SQL_ERROR_CODE 10000 SET MESSAGE_TEXT = 'Unsupported date type: ' || :DATETYPE;
+  END IF;
+END;

templates/server/src/main/resources/archetype-resources/core/src/main/resources/db/type/hana/V0002__Create_RevInfo.sql

@@ -0,0 +1,7 @@
+-- *** RevInfo (Commit log for envers audit trail) ***
+CREATE COLUMN TABLE RevInfo(
+  id          BIGINT NOT NULL GENERATED BY DEFAULT AS IDENTITY (START WITH 1),
+  "timestamp" BIGINT NOT NULL,
+  userLogin   VARCHAR(255),
+  PRIMARY KEY (ID)
+);

templates/server/src/main/resources/archetype-resources/core/src/main/resources/db/type/hana/V0003__Create_BinaryObject.sql

@@ -0,0 +1,9 @@
+-- *** BinaryObject (BLOBs) ***
+CREATE COLUMN TABLE BinaryObject (
+  id                  BIGINT NOT NULL GENERATED BY DEFAULT AS IDENTITY,
+  modificationCounter INTEGER NOT NULL,
+  content             BLOB,
+  filesize            BIGINT NOT NULL,
+  mimeType            VARCHAR(255),
+  CONSTRAINT PK_BinaryObject_id PRIMARY KEY(ID)
+);