Using Dynamic PL/SQL procedures is a valuable feature. It allows you to create Oracle logic that is fluid and flexible based on changing requirements. The added value means you'll have to be responsible for security, performance, and complexity.
What Are Dynamic PL/SQL Procedures
A dynamic PL/SQL procedure is one in which parts of the PL/SQL logic or SQL statements are constructed and executed at runtime rather than being fully defined when you write the code.
Key features include:
- The PL/SQL block or SQL statement is built as a string (or multiple strings) during execution.
- You might not know, at compile time, things like which table, which columns, or even which procedure to call.
- It often uses features like EXECUTE IMMEDIATE or the DBMS_SQL package.
By contrast, static PL/SQL has everything laid out in the source code before compilation: table names, column names, procedure calls etc.
Reasons for Using Dynamic PL/SQL Procedures
Dynamic PL/SQL provides a feature that important static SQL functionality does not offer:
· Flexible Logic
Dynamic PL/SQL allows you to write a single procedure that will work on different tables or columns based on input parameters. For example, reporting modules where the table name, or filtering columns have been changed at runtime.
· Automated Metadata-based Operations
If your schema changes often (e.g. you add columns frequently), or you wish to provide generic admin tools (e.g. create or alter tables automatically), you can generate the DDL at runtime.
· Decreased Code Duplication
Writing many separate procedures that are entirely the same except for a small changes isn't very useful. PL/SQL Dynamic SQL enables you to centralize logic in one location.
· Conditional Behavior
You can create different statements, joins, filtering, ordering, etc. all based on user input or context by building the statement dynamically.
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