Do we need Cursors in PL/SQL?

As an experienced tutor registered on UrbanPro.com specializing in PL/SQL training, I understand the significance of Cursors in PL/SQL programming. Let's delve into the role of Cursors and why they are essential in PL/SQL.

Understanding Cursors in PL/SQL:

1. Definition of Cursors:

   • Cursors are programming constructs in PL/SQL that allow for the selective processing of rows returned by a query.
   • They provide a mechanism to handle query results and process data row by row.

2. Importance of Cursors:

   • Data Manipulation:

     • Cursors are crucial for manipulating data retrieved from the database tables.
     • They enable precise control over the fetching and processing of records.

   • Transaction Control:

     • Cursors play a key role in managing transactions in PL/SQL programs.
     • They help in controlling the visibility and consistency of data during transactions.

   • Record Processing:

     • Cursors are essential when dealing with queries that return multiple rows.
     • They facilitate efficient row-level processing and manipulation.

Types of Cursors:

1. Implicit Cursors:

   • These cursors are automatically created by PL/SQL to handle queries.
   • Implicit cursors are suitable for simple queries with automatic handling of query results.

2. Explicit Cursors:

   • Programmers explicitly define and control explicit cursors.
   • They provide more control over the query process and are ideal for complex queries.

Scenarios Requiring Cursors:

1. Multiple Rows Handling:

   • Cursors are indispensable when dealing with queries that return multiple rows.
   • They allow sequential processing of each row, providing control and flexibility.

2. Data Modification:

   • When performing DML operations (Data Manipulation Language) like INSERT, UPDATE, or DELETE, cursors are used to fetch, update, or delete specific rows.

3. Transaction Management:

   • Cursors assist in managing transactions by allowing explicit control over the fetching and processing of data within a transaction.
     
     

     In conclusion, the use of Cursors in PL/SQL is indispensable for efficient data manipulation and transaction control. To master this essential aspect of PL/SQL, consider enrolling in a reputable online coaching program that covers Cursors comprehensively.