Why the Intense Hatred Towards SQL Cursors?

The Undeserved Reproach of SQL Cursors

Many developers harbor a strong dislike for SQL cursors, often overlooking their practical applications despite acknowledging performance concerns. This aversion frequently leads to unnecessarily complex solutions, even when cursors provide simpler and more efficient alternatives.

A Look Back at Cursor Usage

In the past, cursors were essential for data manipulation in programming languages lacking robust data structures. Modern languages, however, offer built-in list processing capabilities, lessening the reliance on cursors.

Misuse, Not Inherent Limitations

The main issue with cursors isn't their inherent flaws, but rather how they're often misused. Nested cursors, especially without joins, severely impact performance. This common pitfall unfairly tarnishes the reputation of cursors as a whole.

Handling Large Datasets

For large result sets, such as exporting table data to files, cursors remain indispensable. Set-based operations struggle to handle massive datasets in memory, making cursors the superior choice.

Practical Alternatives

Object-Relational Mapping (ORM) frameworks provide a valuable alternative to direct cursor management. ORMs handle cursor interactions internally, abstracting SQL from the application logic and simplifying development.

In conclusion, while avoiding cursors whenever possible is good practice, the widespread aversion is unwarranted. Cursors serve a purpose in specific situations, and their value should not be dismissed due to misconceptions or overgeneralizations.

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