Replicate Google Cloud Storage Data to Multiple Databases via the CData Sync CLI

Always-on applications rely on automatic failover capabilities and real-time access to data. CData Sync for Google Cloud Storage integrates live Google Cloud Storage data into your mirrored databases, always-on cloud databases, and other databases such as your reporting server: Automatically synchronize with remote Google Cloud Storage data from Windows or any machine running Java.

You can use Sync's command-line interface (CLI) to easily control almost all aspects of the replication. You can use the CLI to replicate Google Cloud Storage data to one or many databases without any need to change your configuration.

Connect to Google Cloud Storage Data

You can save connection strings and other settings like email notifications in XML configuration files.

The following example shows how to replicate to SQLite.

Windows

<?xml version="1.0" encoding="UTF-8" ?>
<CDataSync><DatabaseType>SQLite</DatabaseType>
 <DatabaseProvider>System.Data.SQLite</DatabaseProvider>
 <ConnectionString>AuthScheme=OAuth;ProjectId=myProjectId;InitiateOAuth=GETANDREFRESH;</ConnectionString>
 <ReplicateAll>False</ReplicateAll>
 <NotificationUserName></NotificationUserName>
 <DatabaseConnectionString>Data Source=C:\my.db</DatabaseConnectionString>
 <TaskSchedulerStartTime>09:51</TaskSchedulerStartTime>
 <TaskSchedulerInterval>Never</TaskSchedulerInterval>
</CDataSync>

Java

<?xml version="1.0" encoding="UTF-8" ?>
<CDataSync><DatabaseType>SQLite</DatabaseType><DatabaseProvider>org.sqlite.JDBC</DatabaseProvider>
<ConnectionString>AuthScheme=OAuth;ProjectId=myProjectId;InitiateOAuth=GETANDREFRESH;</ConnectionString>
<ReplicateAll>False</ReplicateAll>
<NotificationUserName></NotificationUserName>
<DatabaseConnectionString>Data Source=C:\my.db</DatabaseConnectionString>
</CDataSync>

The Google Cloud Storage source connector supports OAuth, OAuth PKCE, OAuth JWT, and GCP Instance Account authentication.

OAuth (User Account)

To connect with OAuth custom credentials, set the following properties:

• Auth Scheme: Select OAuth.
• OAuth Version: Select the version of OAuth you want to use. The default version is 2.0.
• (Optional) Scope: Specify the scope of your access to the application.
• (Optional) OAuth Authorization URL, OAuth Access Token URL, OAuth Refresh Token URL: Override the default endpoints if needed.

When you connect, the Google Cloud Storage OAuth endpoint opens in your default browser. Log in and grant permissions, then the OAuth flow completes.

OAuth JWT (Service Account)

For silent authentication or delegated organization-wide access, create a service account in Google Cloud, grant it the required permissions on your bucket or project, register a custom OAuth application, and download the certificate file (.p12 or .pfx). Then set:

• Auth Scheme: Select OAuthJWT.
• OAuth JWT Cert: Path to your JWT certificate store.
• OAuth JWT Cert Type: Type of key store. The default is PEMKEY_BLOB.
• OAuth Client Id and OAuth Client Secret: Values from your registered OAuth application.
• (Optional) OAuth JWT Cert Password, OAuth JWT Cert Subject, OAuth JWT Subject, OAuth JWT Subject Type, OAuth JWT Public Key Id: For delegated access and certificate configuration.

For OAuth PKCE and GCP Instance Account methods, refer to the Help documentation.

Configure Replication Queries

Sync enables you to control replication with standard SQL. The REPLICATE statement is a high-level command that caches and maintains a table in your database. You can define any SELECT query supported by the Google Cloud Storage API. The statement below caches and incrementally updates a table of Google Cloud Storage data:

REPLICATE Buckets;

You can specify a file containing the replication queries. This enables you to use the same replication queries to replicate to several databases.

Run Sync

After you have configured the connection strings and replication queries, you can run Sync with the following command-line options:

Windows

GoogleCloudStorageSync.exe -g MySQLiteConfig.xml -f GoogleCloudStorageSync.sql

Java

java -Xbootclasspath/p:c:\sqlitejdbc.jar -jar GoogleCloudStorageSync.jar -g MySQLiteConfig.xml -f GoogleCloudStorageSync.sql