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Create a Data Access Object for IBM Cloud Data Engine Data using JDBI


A brief overview of creating a SQL Object API for IBM Cloud Data Engine data in JDBI.

JDBI is a SQL convenience library for Java that exposes two different style APIs, a fluent style and a SQL object style. The CData JDBC Driver for IBM Cloud Data Engine integrates connectivity to live IBM Cloud Data Engine data in Java applications. By pairing these technologies, you gain simple, programmatic access to IBM Cloud Data Engine data. This article walks through building a basic Data Access Object (DAO) and the accompanying code to read and write IBM Cloud Data Engine data.

Create a DAO for the IBM Cloud Data Engine Jobs Entity

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 MyJobsDAO { //insert new data into IBM Cloud Data Engine @SqlUpdate("INSERT INTO Jobs (UserId, Status) values (:userId, :status)") void insert(@Bind("userId") String userId, @Bind("status") String status); //request specific data from IBM Cloud Data Engine (String type is used for simplicity) @SqlQuery("SELECT Status FROM Jobs WHERE UserId = :userId") String findStatusByUserId(@Bind("userId") String userId); /* * close with no args is used to close the connection */ void close(); }

Open a Connection to IBM Cloud Data Engine

Collect the necessary connection properties and construct the appropriate JDBC URL for connecting to IBM Cloud Data Engine.

IBM Cloud Data Engine uses the OAuth and HMAC authentication standards. See the "Getting Started" chapter of the help documentation for a guide to using OAuth.

Built-in Connection String Designer

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

java -jar cdata.jdbc.ibmclouddataengine.jar

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

A connection string for IBM Cloud Data Engine will typically look like the following:

jdbc:ibmclouddataengine:Api Key=MyAPIKey;Instance CRN=myInstanceCRN;Region=myRegion;Schema=mySchema;OAuth Client Id=myOAuthClientId;OAuth Client Secret=myOAuthClientSecret;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:ibmclouddataengine:Api Key=MyAPIKey;Instance CRN=myInstanceCRN;Region=myRegion;Schema=mySchema;OAuth Client Id=myOAuthClientId;OAuth Client Secret=myOAuthClientSecret;InitiateOAuth=GETANDREFRESH"); MyJobsDAO dao = dbi.open(MyJobsDAO.class); //do stuff with the DAO dao.close();

Read IBM Cloud Data Engine Data

With the connection open to IBM Cloud Data Engine, simply call the previously defined method to retrieve data from the Jobs entity in IBM Cloud Data Engine.

//disply the result of our 'find' method String status = dao.findStatusByUserId("user@domain.com"); System.out.println(status);

Write IBM Cloud Data Engine Data

It is also simple to write data to IBM Cloud Data Engine, using the previously defined method.

//add a new entry to the Jobs entity dao.insert(newUserId, newStatus);

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