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JDBI からDigitalOcean Data のデータアクセスオブジェクトを作成

JDBI でDigitalOcean data 用のSQL オブジェクトAPIを作成する方法を概説します。

JDBI は、Fluent スタイルとSQL オブジェクトスタイルという2つの異なるスタイルAPI を公開する、Java 用のSQL コンビニエンスライブラリです。CData JDBC Driver for DigitalOcean は、Java アプリケーションとリアルタイムDigitalOcean data のデータ連携を実現します。これらの技術を組み合わせることによって、DigitalOcean data へのシンプルなコードアクセスが可能になります。ここでは、基本的なDAO(Data Access Object )とそれに付随するDigitalOcean data の読み書きのためのコードの作成について説明します。

DigitalOcean Droplets Entity のDAO を作成

The interface below declares the desired behavior for the SQL object to create a single method for each SQL statement to be implemented.

public interface MyDropletsDAO { //insert new data into DigitalOcean @SqlUpdate("INSERT INTO Droplets (Id, Name) values (:id, :name)") void insert(@Bind("id") String id, @Bind("name") String name); //request specific data from DigitalOcean (String type is used for simplicity) @SqlQuery("SELECT Name FROM Droplets WHERE Id = :id") String findNameById(@Bind("id") String id); /* * close with no args is used to close the connection */ void close(); }

DigitalOcean への接続を開く

Collect the necessary connection properties and construct the appropriate JDBC URL for connecting to DigitalOcean.

DigitalOcean uses OAuth 2.0 authentication. To authenticate using OAuth, you can use the embedded credentials or register an app with DigitalOcean.

See the Getting Started guide in the CData driver documentation for more information.

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 DigitalOcean JDBC Driver.Either double-click the JAR file or execute the jar file from the command-line.

java -jar cdata.jdbc.digitalocean.jar

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

A connection string for DigitalOcean will typically look like the following:

jdbc:digitalocean:InitiateOAuth=GETANDREFRESH

Use the configured JDBC URL to obtain an instance of the DAO interface.The particular method shown below will open a handle bound to the instance, so the instance needs to be closed explicitly to release the handle and the bound JDBC connection.

DBI dbi = new DBI("jdbc:digitalocean:InitiateOAuth=GETANDREFRESH"); MyDropletsDAO dao = dbi.open(MyDropletsDAO.class); //do stuff with the DAO dao.close();

DigitalOcean Data について

With the connection open to DigitalOcean, simply call the previously defined method to retrieve data from the Droplets entity in DigitalOcean.

//disply the result of our 'find' method String name = dao.findNameById("1"); System.out.println(name);

DigitalOcean Data の書き方

It is also simple to write data to DigitalOcean, using the previously defined method.

//add a new entry to the Droplets entity dao.insert(newId, newName);

Since the JDBI library is able to work with JDBC connections, you can easily produce a SQL Object API for DigitalOcean by integrating with the CData JDBC Driver for DigitalOcean.Download a free trial and work with live DigitalOcean data in custom Java applications today.

 
 
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