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Question-1. What is OpenEdge ABL?
Answer-1: OpenEdge ABL (Advanced Business Language) is a high-level, 4GL programming language primarily used for business application development.
Question-2. Who developed OpenEdge ABL?
Answer-2: OpenEdge ABL was developed by Progress Software Corporation.
Question-3. What type of applications can be built with OpenEdge ABL?
Answer-3: OpenEdge ABL is used to develop database-driven, distributed, and web-based business applications.
Question-4. How do you define a variable in OpenEdge ABL?
Answer-4: Use the DEFINE VARIABLE statement, e.g., DEFINE VARIABLE x AS INTEGER NO-UNDO..
Question-5. What are the basic data types in OpenEdge ABL?
Answer-5: Basic data types include INTEGER, CHARACTER, DATE, LOGICAL, DECIMAL, and BLOB.
Question-6. How do you display output in OpenEdge ABL?
Answer-6: Use the DISPLAY or MESSAGE statement, e.g., DISPLAY "Hello, World!"..
Question-7. What is a FOR EACH statement in OpenEdge ABL?
Answer-7: The FOR EACH statement is used to iterate through records in a database table.
Question-8. How do you connect to a database in OpenEdge ABL?
Answer-8: Use the CONNECT statement, e.g., CONNECT "mydb" USER "user" PASSWORD "pass"..
Question-9. What is a buffer in OpenEdge ABL?
Answer-9: A buffer is a memory structure that holds a record from a database table for manipulation.
Question-10. How do you define a temp-table in OpenEdge ABL?
Answer-10: Use the DEFINE TEMP-TABLE statement, e.g., DEFINE TEMP-TABLE ttCustomer FIELD name AS CHARACTER..
Question-11. How do you create a procedure in OpenEdge ABL?
Answer-11: Use the PROCEDURE keyword, e.g., PROCEDURE myProc: DISPLAY "Hello". END..
Question-12. What is a NO-UNDO option in OpenEdge ABL?
Answer-12: The NO-UNDO option specifies that changes to a variable or temp-table do not require undo logging.
Question-13. How do you handle transactions in OpenEdge ABL?
Answer-13: Use DO TRANSACTION blocks to group a set of statements into a single transaction.
Question-14. What is the FIND statement used for?
Answer-14: The FIND statement is used to locate a specific record in a database table.
Question-15. How do you define an index in OpenEdge ABL?
Answer-15: Use the INDEX keyword in the table schema definition, e.g., INDEX idxName ON tableName(fieldName)..
Question-16. How do you create a dynamic query in OpenEdge ABL?
Answer-16: Use the CREATE QUERY statement, e.g., CREATE QUERY myQuery.
Question-17. What is a temp-table?
Answer-17: A temp-table is an in-memory table used for storing and manipulating temporary data.
Question-18. How do you handle errors in OpenEdge ABL?
Answer-18: Use the CATCH block in combination with DO ON ERROR or UNDO statements.
Question-19. What is the difference between UNDO and ROLLBACK?
Answer-19: UNDO reverts changes at the block level, while ROLLBACK undoes the entire transaction.
Question-20. How do you sort records in a query?
Answer-20: Use the BY clause in a FOR EACH or QUERY, e.g., FOR EACH Customer BY Name..
Question-21. What is the BUFFER keyword used for?
Answer-21: BUFFER allows manipulation of table records dynamically at runtime.
Question-22. What is a ProDataSet in OpenEdge ABL?
Answer-22: A ProDataSet is a collection of temp-tables and their relations, used for managing complex data structures.
Question-23. How do you define a shared variable?
Answer-23: Use the DEFINE SHARED VARIABLE statement, e.g., DEFINE SHARED VARIABLE x AS INTEGER..
Question-24. What are smart objects in OpenEdge?
Answer-24: Smart objects are reusable UI components in OpenEdge for building graphical applications.
Question-25. How do you delete a record in OpenEdge ABL?
Answer-25: Use the DELETE statement, e.g., DELETE Customer WHERE CustomerID = 101.
Question-26. What is the OUTPUT TO statement?
Answer-26: OUTPUT TO directs program output to a file, printer, or other device.
Question-27. How do you run an external procedure in OpenEdge ABL?
Answer-27: Use the RUN statement, e.g., RUN externalProc.p.
Question-28. How do you define a class in OpenEdge ABL?
Answer-28: Use the CLASS keyword, e.g., CLASS MyClass: METHOD PUBLIC VOID myMethod(): END.
Question-29. What is the purpose of SUPER in ABL?
Answer-29: SUPER is used to invoke the behavior of a parent class's method or constructor.
Question-30. How do you define an interface in ABL?
Answer-30: Use the INTERFACE keyword, e.g., INTERFACE IExample: METHOD PUBLIC VOID DoWork(): END.
Question-31. What is the difference between static and instance methods?
Answer-31: Static methods belong to the class, while instance methods belong to an object.
Question-32. What is the purpose of THIS-PROCEDURE?
Answer-32: THIS-PROCEDURE refers to the currently running procedure.
Question-33. How do you check if a record exists?
Answer-33: Use the IF AVAILABLE statement, e.g., IF AVAILABLE Customer THEN DISPLAY Customer.
Question-34. What is the difference between REPEAT and DO WHILE?
Answer-34: REPEAT loops through a block indefinitely or for a fixed count, while DO WHILE runs based on a condition.
Question-35. What is the BUFFER-COPY statement?
Answer-35: BUFFER-COPY copies data from one buffer to another.
Question-36. What is the FIND FIRST statement?
Answer-36: FIND FIRST retrieves the first record in a database table that matches the criteria.
Question-37. What is a database trigger?
Answer-37: A database trigger is a program that executes automatically in response to database events like insert, update, or delete.
Question-38. How do you lock a record in OpenEdge ABL?
Answer-38: Use the EXCLUSIVE-LOCK or SHARE-LOCK keywords in a FIND statement.
Question-39. How do you write a message to the log file?
Answer-39: Use the LOG-MANAGER:WRITE-MESSAGE() method.
Question-40. What is a dynamic temp-table?
Answer-40: A dynamic temp-table is created at runtime using CREATE TEMP-TABLE.
Question-41. How do you compare two buffers?
Answer-41: Use the BUFFER-COMPARE statement, e.g., BUFFER-COMPARE buffer1 TO buffer2.
Question-42. What is the NO-LOCK option in ABL?
Answer-42: NO-LOCK reads records without locking them, allowing for better performance.
Question-43. What is the purpose of UNDO, RETRY?
Answer-43: UNDO, RETRY rolls back the transaction and retries the block.
Question-44. What are persistent procedures in ABL?
Answer-44: Persistent procedures remain in memory and can be invoked multiple times.
Question-45. How do you load XML data into a temp-table?
Answer-45: Use the READ-XML method, e.g., ttCustomer:READ-XML("FILE", "data.xml")..
Question-46. How do you create an index on a temp-table?
Answer-46: Use the INDEX keyword within DEFINE TEMP-TABLE.
Question-47. What is a data relation in ABL?
Answer-47: A data relation defines a parent-child relationship between temp-tables in a ProDataSet.
Question-48. How do you call a web service in ABL?
Answer-48: Use the RUN statement with a SOAP Web Service proxy object.
Question-49. What is a table buffer?
Answer-49: A table buffer represents a record from a database or temp-table and allows manipulation of that record.
Question-50. What is the main use of OpenEdge ABL?
Answer-50: OpenEdge ABL is used for developing enterprise-grade business applications and database management.
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