How to Create and Use Temporary Functions in PostgreSQL?

PostgreSQL temporary function: efficient and convenient function solution

PostgreSQL functions are usually stored persistently in the database. However, there may be scenarios where you may only need to use a function during a specific transaction or script execution. This is where temporary functions are ideal.

How to create a temporary function?

The creation of PostgreSQL temporary functions relies on the pg_temp pattern. The schema is automatically created when you connect to the database and deleted when the connection is terminated. Creating a function in this mode ensures that it is only valid during the connection.

For example, the following code creates a temporary function named testfunc():

CREATE FUNCTION pg_temp.testfunc() RETURNS text AS $$
  SELECT 'hello'::text
$$ LANGUAGE SQL;

This function executes like other functions in the current connection until the connection is closed or times out.

Advantages of temporary functions:

Temporary functions have the following advantages:

• Disposability: Disposable after use, keeping the database clean and orderly.
• Isolation: Only limited to the current connection to avoid conflicts with functions in other connections.
• Simplified execution: can be executed directly in the script without the need to explicitly create or delete statements.

Summary:

PostgreSQL temporary functions provide a practical way to create and use one-time functions within a single connection. The pg_temp pattern allows you to create functions that are valid only during the connection, thus increasing efficiency and ensuring data integrity.

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