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Replicate Multiple Google Spanner Accounts
Replicate multiple Google Spanner accounts to one or many databases.
CData Sync for Google Spanner is a stand-alone application that provides solutions for a variety of replication scenarios such as replicating sandbox and production instances into your database. Both Sync for Windows and Sync for Java include a command-line interface (CLI) that makes it easy to manage multiple Google Spanner connections. In this article we show how to use the CLI to replicate multiple Google Spanner accounts.
Configure Google Spanner Connections
You can save connection and email notification settings in an XML configuration file. To replicate multiple Google Spanner accounts, use multiple configuration files. Below is an example configuration to replicate Google Spanner to SQLite:
Windows
<?xml version="1.0" encoding="UTF-8" ?>
<CDataSync>
<DatabaseType>SQLite</DatabaseType>
<DatabaseProvider>System.Data.SQLite</DatabaseProvider>
<ConnectionString>ProjectId='project1';InstanceId='instance1';Database='db1';</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>ProjectId='project1';InstanceId='instance1';Database='db1';</ConnectionString>
<ReplicateAll>False</ReplicateAll>
<NotificationUserName></NotificationUserName>
<DatabaseConnectionString>Data Source=C:\my.db</DatabaseConnectionString>
</CDataSync>
Google Spanner uses the OAuth authentication standard. To authenticate using OAuth, you can use the embedded credentials or register an app with Google.
See the Getting Started guide in the CData driver documentation for more information.
Configure Queries for Each Google Spanner Instance
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 Spanner API. The statement below caches and incrementally updates a table of Google Spanner data:
REPLICATE Customer;
You can specify a file containing the replication queries you want to use to update a particular database. Separate replication statements with semicolons. The following options are useful if you are replicating multiple Google Spanner accounts into the same database:
You can use a different table prefix in the REPLICATE SELECT statement:
REPLICATE PROD_Customer SELECT * FROM Customer
Alternatively, you can use a different schema:
REPLICATE PROD.Customer SELECT * FROM Customer
Run Sync
After you have configured the connection strings and replication queries, you can run Sync with the following command-line options:
Windows
GoogleSpannerSync.exe -g MyProductionGoogleSpannerConfig.xml -f MyProductionGoogleSpannerSync.sql
Java
java -Xbootclasspath/p:c:\sqlitejdbc.jar -jar GoogleSpannerSync.jar -g MyProductionGoogleSpannerConfig.xml -f MyProductionGoogleSpannerSync.sql
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