EGL (programming Language) - Code Examples

Code Examples

Program

An EGL Program part is a generatable logic part with one entry point. Each Program part contains a main function, which represents the logic that runs at program start up. A program can include other functions and can access functions that are outside of the program. The function main can invoke those other functions. Program functions are composed of a set of EGL statements, variables, and constants.

Program HelloWorld const GREETING string = "Hello, "; function main myName string = "John"; sayHello(myName); end function sayHello(name String in) SysLib.writeStdOut(GREETING + name + "!"); end end

Record

An EGL Record part defines a set of data elements. In this example, a record with the name CustomerRecord is defined with 6 fields.

Record CustomerRecord type BasicRecord customerNumber INT; customerName STRING; customerAddr1 STRING; customerAddr2 STRING; customerAddr3 STRING; customerBalance MONEY; end

EGL has a specialized type of record called SQLRecord that is used to exchange data with a relational database.

record Employee type sqlRecord { tableNames = ], keyItems =} EMPNUMBER string{ column = "EMPNO", maxLen = 6}; FIRSTNME string{ sqlVariableLen = yes, maxLen = 12}; MIDINIT string{ isSqlNullable = yes, maxLen = 1}; LASTNAME string{ sqlVariableLen = yes, maxLen = 15}; DEPT string{ column = "WORKDEPT", isSqlNullable = yes, maxLen = 3}; PHONENO string{ isSqlNullable = yes, maxLen = 4}; HIREDATE date{ isSqlNullable = yes}; end

• In this example, the record Employee is bound to a table (or view) named Employee.

Service

An EGL Service part contains public functions meant to be accessed from other applications or systems. In this example, a service with two functions is defined.

package com.mycompany.services; service EmployeeService function getEmployees returns(Employee) records Employee; // define an empty array of records get records; // retrieve records from the database return (records); // return the records end function addEmployee(emp Employee in) returns (boolean) try add remp; return (true); onException (ex AnyException) return (false); end end end

• In EGL, code is organized in packages (like Java (programming language))
• The first function, getEmployees, returns an array of records populated from the records in a database.
• The second function, addEmployee adds a new record to the database and returns a true or false depending on whether the record was added successfully.

RUIHandler

The main component of a Rich UI application is a Rich UI handler part. These parts are generated into JavaScript.

package com.mycompany.ui; import com.mycompany.services.Employee; import com.mycompany.services.EmployeeService; import dojo.widgets.DojoGrid; import dojo.widgets.DojoGridColumn; handler EmployeeView type RUIhandler { initialUI = [ grid ], onConstructionFunction = start, cssFile = "main.css" } grid DojoGrid { behaviors =, headerBehaviors =, columns = [ new DojoGridColumn { displayName = "First Name", name = "FIRSTNAME" }, new DojoGridColumn { displayName = "Last Name", name = "LASTNAME" }, new DojoGridColumn { displayName = "Salary", name = "SALARY" } ] }; function start svc EmployeeService { }; call svc.getEmployees returning to displayEmployees; end function displayEmployees(retResult Employee in) grid.data = retResult as any ; end end