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Cosmos DBData のPostgreSQL インターフェース

Cosmos DB JDBC Driver のRemoting 機能を使用して、データアクセス用のPostgreSQL エントリポイントを作成します。

インターネット上には利用可能な膨大な数のPostgreSQL クライアントがあります。標準のドライバーからBI および分析ツールまで、PostgreSQL はデータアクセスのための人気の高いインタフェースです。 JDBC ドライバーを使用して、標準クライアントから接続できるPostgreSQL エントリポイントを作成することができます。

PostgreSQL データベースとしてCosmos DB data にアクセスするには、CData JDBC Driver for Cosmos DB とJDBC 外部データラッパー(FDW)を使用します。ここでは、FDW をコンパイルしてインストールし、PostgreSQL サーバーからCosmos DB data をクエリします。

JDBC データソースにCosmos DB Data を設定

To connect to Cosmos DB as a JDBC data source, you will need the following:

  • Driver JAR path: The JAR is located in the lib subfolder of the installation directory.
  • Driver class: cdata.jdbc.cosmosdb.CosmosDBDriver

  • JDBC URL: The URL must start with "jdbc:cosmosdb:" and can include any of the connection properties in name-value pairs separated with semicolons.

    To obtain the connection string needed to connect to a Cosmos DB account using the MongoDB API, log in to the Azure Portal, select Azure Cosmos DB, and select your account. In the Settings section, click Connection String.

    • Server: Set this to the Host value. You can specify the port here or in Port.
    • Port: Specify the port number.
    • Database: Set this to the database you want to read from and write to.
    • User: Set this to the username to be used to perform MongoDB authentication to the database.
    • Password: Set this to the user's password.

    To access Cosmos DB tables you can use automatic schema discovery or write your own schema definitions. Schemas are defined in .rsd files, which have a simple format that makes them easy to extend. You can also execute free-form queries that are not tied to the schema.

    ビルトイン接続文字列デザイナー

    For assistance in constructing the JDBC URL, use the connection string designer built into the Cosmos DB JDBC Driver.Either double-click the JAR file or execute the jar file from the command-line.

    java -jar cdata.jdbc.cosmosdb.jar

    Fill in the connection properties and copy the connection string to the clipboard.

    A typical JDBC URL is below:

    jdbc:cosmosdb:Server=anhohmongo.documents.azure.com;Port=10255;Database=test;User=contoso123:0Fc3IolnL123;Password=test;

JDBC Foreign Data Wrapper をビルド

The Foreign Data Wrapper can be installed as an extension to PostgreSQL, without recompiling PostgreSQL.The jdbc2_fdw extension is used as an example.

  1. Add a symlink from the shared object for your version of the JRE to /usr/lib/libjvm.so.For example: ln -s /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/server/libjvm.so /usr/lib/libjvm.so
  2. Start the build: make install USE_PGXS=1

Cosmos DB Data をPostgreSQL データベースとしてクエリ

After you have installed the extension, follow the steps below to start executing queries to Cosmos DB data:

  1. Log into your database.
  2. Load the extension for the database: CREATE EXTENSION jdbc2_fdw;
  3. Create a server object for Cosmos DB: CREATE SERVER CosmosDB FOREIGN DATA WRAPPER jdbc2_fdw OPTIONS ( drivername 'cdata.jdbc.cosmosdb.CosmosDBDriver', url 'jdbc:cosmosdb:Server=anhohmongo.documents.azure.com;Port=10255;Database=test;User=contoso123:0Fc3IolnL123;Password=test;', querytimeout '15', jarfile '/home/MyUser/CData/CData\ JDBC\ Driver\ for\ Salesforce MyDriverEdition/lib/cdata.jdbc.cosmosdb.jar');
  4. Create a user mapping for the username and password of a user known to the MySQL daemon. CREATE USER MAPPING for postgres SERVER CosmosDB OPTIONS ( username 'admin', password 'test');
  5. Create a foreign table in your local database: postgres=# CREATE FOREIGN TABLE restaurants ( restaurants__id text, restaurants_borough text, restaurants_cuisine numeric) SERVER CosmosDB OPTIONS ( table_name 'restaurants');
You can now execute read/write commands to Cosmos DB: postgres=# SELECT * FROM restaurants;
 
 
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