Ready to get started?

Learn more about the CData JDBC Driver for MySQL or download a free trial:

Download Now

JDBI からMySQL Data のデータアクセスオブジェクトを作成

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

MySQL Orders 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 MyOrdersDAO { //insert new data into MySQL @SqlUpdate("INSERT INTO Orders (ShipCountry, Freight) values (:shipCountry, :freight)") void insert(@Bind("shipCountry") String shipCountry, @Bind("freight") String freight); //request specific data from MySQL (String type is used for simplicity) @SqlQuery("SELECT Freight FROM Orders WHERE ShipCountry = :shipCountry") String findFreightByShipCountry(@Bind("shipCountry") String shipCountry); /* * close with no args is used to close the connection */ void close(); }

MySQL への接続を開く

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

The Server and Port properties must be set to a MySQL server. If IntegratedSecurity is set to false, then User and Password must be set to valid user credentials. Optionally, Database can be set to connect to a specific database. If not set, tables from all databases will be returned.

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

java -jar cdata.jdbc.mysql.jar

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

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

jdbc:mysql:User=myUser;Password=myPassword;Database=NorthWind;Server=myServer;Port=3306;

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:mysql:User=myUser;Password=myPassword;Database=NorthWind;Server=myServer;Port=3306;"); MyOrdersDAO dao = dbi.open(MyOrdersDAO.class); //do stuff with the DAO dao.close();

MySQL Data について

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

//disply the result of our 'find' method String freight = dao.findFreightByShipCountry("USA"); System.out.println(freight);

MySQL Data の書き方

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

//add a new entry to the Orders entity dao.insert(newShipCountry, newFreight);

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

 
 
ダウンロード