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JDBI からExcel Data のデータアクセスオブジェクトを作成

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

Excel Sheet 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 MySheetDAO { //insert new data into Excel @SqlUpdate("INSERT INTO Sheet (Name, Revenue) values (:name, :revenue)") void insert(@Bind("name") String name, @Bind("revenue") String revenue); //request specific data from Excel (String type is used for simplicity) @SqlQuery("SELECT Revenue FROM Sheet WHERE Name = :name") String findRevenueByName(@Bind("name") String name); /* * close with no args is used to close the connection */ void close(); }

Excel への接続を開く

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

The ExcelFile, under the Authentication section, must be set to a valid Excel File.

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

java -jar cdata.jdbc.excel.jar

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

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

jdbc:excel:Excel File='C:\MyExcelWorkbooks\SampleWorkbook.xlsx';

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:excel:Excel File='C:\MyExcelWorkbooks\SampleWorkbook.xlsx';"); MySheetDAO dao = dbi.open(MySheetDAO.class); //do stuff with the DAO dao.close();

Excel Data について

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

//disply the result of our 'find' method String revenue = dao.findRevenueByName("Bob"); System.out.println(revenue);

Excel Data の書き方

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

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

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

 
 
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