Oracle PL/SQL Exceptions and Cursors | GoLogica
Oracle PL/SQL Exceptions and Cursors | GoLogica Online Training
Welcome to the GoLogica comprehensive guide on Oracle PL/SQL Exceptions and Cursors. This long video dives deep into the crucial components of PL/SQL programming, providing valuable insights and practical knowledge for both beginners and experienced developers.
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In this video, you will learn about:
• PL/SQL Exceptions: Understanding the importance of handling exceptions, the types of exceptions, and how to use predefined and user-defined exceptions to manage errors in your PL/SQL code.
• Cursors in PL/SQL: Exploring the concept of cursors, including implicit and explicit cursors, how to use them to handle query results, and best practices for cursor management.
Key Topics Covered
1. Introduction to PL/SQL Exceptions
o What are exceptions?
o Types of exceptions: Predefined, user-defined, and unnamed exceptions.
o How exceptions improve the robustness of your PL/SQL programs.
2. Handling Predefined Exceptions
o Common predefined exceptions such as NO_DATA_FOUND, TOO_MANY_ROWS, and ZERO_DIVIDE.
o Practical examples demonstrating how to handle these exceptions effectively.
3. User-Defined Exceptions
o Creating and raising user-defined exceptions.
o Example scenarios where user-defined exceptions are beneficial.
4. Exception Propagation and Scope
o How exceptions propagate through nested blocks.
o Using RAISE and RAISE_APPLICATION_ERROR for custom error messages.
5. Introduction to Cursors
o What are cursors and why they are used.
o Difference between implicit and explicit cursors.
6. Implicit Cursors
o How Oracle handles implicit cursors.
o Using SQL attributes like %FOUND, %NOTFOUND, %ROWCOUNT, and %ISOPEN.
7. Explicit Cursors
o Declaring, opening, fetching from, and closing explicit cursors.
o Looping through cursor rows with FOR and WHILE loops.
8. Cursor Parameters
o Defining cursors with parameters.
o Passing parameters to cursors for dynamic queries.
9. Cursor FOR Loops
o Simplifying cursor operations with FOR loops.
o Benefits and examples of using a cursor FOR loops.
10. Best Practices for Using Exceptions and Cursors
o Writing efficient and maintainable PL/SQL code.
o Avoiding common pitfalls and performance issues.
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