What does call mean in oracle

The CALL statement in Oracle can be used to call stored procedures or functions. It works by encapsulating reused code, optimizing performance, and encapsulating data access. The steps include: 1. Define the stored procedure or function; 2. Call the stored procedure or function.

CALL in Oracle

CALL syntax:

<code>CALL procedure_name ( argument1, argument2, ... )</code>

Purpose:

The CALL statement is used to call stored procedures, functions or packages in the Oracle database.

Function:

• Execute stored procedures or functions.
• Pass parameters to stored procedures or functions.
• Get the result value from the stored procedure or function.

Advantages:

• Code reuse: By calling stored procedures, reused code can be encapsulated in one place.
• Performance optimization: The stored procedure is executed on the database server, which can reduce the processing burden on the client.
• Data encapsulation: Stored procedures can encapsulate access to underlying database tables, thereby improving security.

Steps:

1. Define a stored procedure or function: Use CREATE PROCEDURE or ## The #CREATE FUNCTION statement defines a stored procedure or function.
2. Call a stored procedure or function: Use the CALL statement to call a stored procedure or function.

Example:

get_customer_name:

<code class="sql">CREATE FUNCTION get_customer_name (customer_id NUMBER) RETURN VARCHAR2
AS
  customer_name VARCHAR2(100);
BEGIN
  SELECT customer_name INTO customer_name FROM customers WHERE customer_id = customer_id;
  RETURN customer_name;
END;
/</code>

<code class="sql">CALL get_customer_name(1);
-- 输出：John Doe</code>

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