For the database connection and schema evolution for the Editorial Comments feature Hibernate and Liquibase are used. Both frameworks support multiple databases and therefore must be configured correctly.

For each database CoreMedia delivers the appropriate configuration in an extra Maven module. The database driver for MySQL and PostgreSQL are already provided as runtime dependencies in the studio-server-app module. The Maven dependency has to be added to the studio-server-app and contains the properties to be set and a transitive dependency to the driver. Furthermore, the database schema and the database user are expected to be setup. The required schema name, username and password differs for each database and can be found in the detailed descriptions.

Further configuration options can be found in Section 3.4.9, “Editorial Comments Configuration” in Deployment Manual.

Note

In case you want to provide a schema or username, different to cm_editorial_comments (current default), use the properties editorial.comments.db.username, editorial.comments.db.schema and editorial.comments.db.password.

MySQL

To configure MySQL, prepare the database as described in Database requirements and set the property editorial.comments.datasource.url.

Database requirements:

Maven Dependency:

<dependency>
      <groupId>com.coremedia.blueprint</groupId>
      <artifactId>database-drivers</artifactId>
      <type>pom</type>
      <scope>runtime</scope>
    </dependency>
</dependencies>

Required properties:

PostgreSQL

To configure PostgreSQL, prepare the database as described in Database requirements and set the property editorial.comments.datasource.url.

Database requirements:

Maven Dependency:

<dependency>
      <groupId>com.coremedia.blueprint</groupId>
      <artifactId>database-drivers</artifactId>
      <type>pom</type>
      <scope>runtime</scope>
    </dependency>
</dependencies>

Required Properties:

Note

Should you use PostgreSQL hosted on Azure, it is necessary to provide a postfix with the domain to the username. Use editorial.comments.db.username to set the username with the postfix:

editorial.comments.db.username=cm_editorial_comments@domain

editorial.comments.db.schema=cm_editorial_comments

Microsoft SQL Server

To configure Microsoft SQL Server, prepare the database as described in Database requirements, add the Maven dependency and set the property editorial.comments.datasource.url.

Database requirements:

Maven Dependency:

<dependency>
  <groupId>com.coremedia.cms</groupId>
  <artifactId>editorial-comments-data-mssql</artifactId>
</dependency>

Required Properties, replace username and password if required:

Oracle

To configure Oracle DB, prepare the database as described in Database requirements, add the Maven dependency and set the property editorial.comments.datasource.url.

Database requirements:

Maven Dependencies:

<dependency>
  <groupId>com.coremedia.cms</groupId>
  <artifactId>editorial-comments-data-oracle</artifactId>
</dependency>

Required Properties:

Working with Liquibase

Run modes

Liquibase can run either on startup of each server automatically or get executed manually. The default for the Studio-Server is the automatic run on each server startup. This means that on each startup liquibase checks if the schema contains all entries of the defined changesets. During startup of the Studio-Server Liquibase sets a lock in the database if the actual schema is not fully applied. If the Studio-Server startup is interrupted during the process of applying the schema, the lock might be left in the database. This is very unlikely but if this occurs the lock can be released. For instructions see Section “Release locks”.

Even if it is recommended to run Liquibase automatically in some deployment scenarios it might make sense to execute Liquibase manually. To reach this, automatic runs can be disabled by setting the property editorial.comments.liquibase.enabled=false. Afterwards you have to take care to run an database schema upgrade on each upgrade of CMCC. This can be done by either running a Studio Server instance once with the property editorial.comments.liquibase.enabled=true or by using the Liquibase command line tool. The following example shows a liquibase.properties file for a MySQL setup used by the command line tool:

          changeLogFile=db/changelog/db.changelog-editorial-comments.xml
username=cm_editorial_comments
password=cm_editorial_comments
driver=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/cm_editorial_comments
?useUnicode=yes&characterEncoding=UTF-8
classpath=>pathToMySqlDriver>/mysql-connector-j-8.2.0.jar
:<pathTo_editorial-comments-data-jar>editorial-comments-data-1-SNAPSHOT.jar

        

Release locks

By default liquibase runs automatically on Studio Server startup. In very rare cases (e.g. interruption on startup) the database might contain a lock entry that has not been cleaned up. As a result starting Studio Servers is blocked by Liquibase. The lock can either be removed manually manually or with the Liquibase cmd tool which can be also executed via Docker:

          docker run --rm -e INSTALL_MYSQL=true liquibase/liquibase \
--url="jdbc:mysql://host:port/cm_editorial_comments" \
--username=cm_editorial_comments \
--password=cm_editorial_comments \
releaseLocks