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JDBI からxBase Data のデータアクセスオブジェクトを作成

JDBI でxBase 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 xBase は、Java アプリケーションとリアルタイムxBase 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、xBase 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xBase 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。

xBase Invoices 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 MyInvoicesDAO { //request specific data from xBase (String type is used for simplicity) @SqlQuery("SELECT Total FROM Invoices WHERE Class = :class") String findTotalByClass(@Bind("class") String class); /* * close with no args is used to close the connection */ void close(); }

xBase への接続を開く

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

The DataSource property must be set to the name of the folder that contains the .dbf files. Specify the IncludeFiles property to work with xBase table files having extensions that differ from .dbf. Specify multiple extensions in a comma-separated list.

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

java -jar cdata.jdbc.xbase.jar

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

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

jdbc:xbase:DataSource=MyDBFFilesFolder;

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:xbase:DataSource=MyDBFFilesFolder;"); MyInvoicesDAO dao = dbi.open(MyInvoicesDAO.class); //do stuff with the DAO dao.close();

xBase Data について

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

//disply the result of our 'find' method String total = dao.findTotalByClass("ASSET"); System.out.println(total);

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

 
 
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