Create a Data Access Object for JD Edwards Data using 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 JD Edwards integrates connectivity to live JD Edwards data in Java applications. By pairing these technologies, you gain simple, programmatic access to JD Edwards data. This article explains how to build a basic Data Access Object (DAO) and the accompanying code to read JD Edwards data.

Create a DAO for the JD Edwards AccountsPayable.AccountLedger 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 MyAccountsPayable.AccountLedgerDAO {
  //request specific data from JD Edwards (String type is used for simplicity)
  @SqlQuery("SELECT Amount FROM AccountsPayable.AccountLedger WHERE BusinessUnit = :businessUnit")
  String findAmountByBusinessUnit(@Bind("businessUnit") String businessUnit);

  /*
   * close with no args is used to close the connection
   */
  void close();
}

Open a Connection to JD Edwards

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

The driver connects to JD Edwards through your Application Interface Services (AIS) Server. Set the following connection properties:

• URL: The base HTTPS URL of your AIS Server (e.g., https://jde-ais.example.com:8300).
• User: Your JD Edwards username.
• Password: Your JD Edwards password.
• Environment (optional): The JD Edwards environment to use (e.g., PD920 for production or DV920 for development). If not specified, the AIS Server's default environment is used.
• Role (optional): The JD Edwards role for the session. If not specified, the AIS Server's default role is used.
• DeviceName (optional): An identifier for the connecting device or application, used for auditing and logging on the AIS Server.
• Jasserver (optional): The specific Java Application Server (JAS) instance to route requests through, useful in clustered environments.

Choosing Which Data Is Exposed

JD Edwards organizes tables and business views by System Code, and the driver exposes each System Code as its own schema. Use these properties to control which schemas are available:

• DataModel: One or more ERP modules (comma-separated) whose System Codes are exposed as schemas, or All to expose every System Code in the connected instance. Defaults to FinancialManagement.
• SystemCodes: A comma-separated list of additional System Codes to expose alongside those from DataModel (e.g., 42,43).

When you connect, the driver sends your credentials to the AIS Server to obtain a session token and caches it. The driver requests a new token automatically before the session expires.

Built-in Connection String Designer

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

java -jar cdata.jdbc.jdedwards.jar

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

A connection string for JD Edwards will typically look like the following:

jdbc:jdedwards:URL=https://your-jde-environment-app.example.com;User=admin;Password=myPassword;

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:jdedwards:URL=https://your-jde-environment-app.example.com;User=admin;Password=myPassword;");
MyAccountsPayable.AccountLedgerDAO dao = dbi.open(MyAccountsPayable.AccountLedgerDAO.class);

//do stuff with the DAO

dao.close();

Read JD Edwards Data

With the connection open to JD Edwards, simply call the previously defined method to retrieve data from the AccountsPayable.AccountLedger entity in JD Edwards.

//disply the result of our 'find' method
String amount = dao.findAmountByBusinessUnit("100");
System.out.println(amount);

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