Replicate CouchDB Data to Multiple Databases



Replicate CouchDB data to disparate databases with a single configuration.

Always-on applications rely on automatic failover capabilities and real-time access to data. CData Sync for CouchDB integrates live CouchDB data into your mirrored databases, always-on cloud databases, and other databases such as your reporting server: Automatically synchronize with remote CouchDB 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 CouchDB data to one or many databases without any need to change your configuration.

Connect to CouchDB 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>Url=http://localhost:5984;User=abc123;Password=abcdef;</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>Url=http://localhost:5984;User=abc123;Password=abcdef;</ConnectionString> <ReplicateAll>False</ReplicateAll> <NotificationUserName></NotificationUserName> <DatabaseConnectionString>Data Source=C:\my.db</DatabaseConnectionString> </CDataSync>

Set the following to connect:

  • Url: The Url of your instance. For example: http://localhost:5984
  • User The Apache CouchDB user account used to authenticate.
  • Password The Apache CouchDB password associated with the authenticating user.

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 CouchDB API. The statement below caches and incrementally updates a table of CouchDB data:

REPLICATE Movies;

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

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

Java

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

Ready to get started?

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