How to use call in oracle

The CALL command in Oracle is used to call a stored procedure by specifying the stored procedure name and providing input parameters (if required). Benefits include code reuse, security enhancements, and performance optimizations. Attention needs to be paid to user permissions, parameter order, and declaration of output parameters.

Usage of CALL in Oracle

What is CALL?

CALL is a command in Oracle used to call a stored procedure.

Syntax:

CALL procedure_name(parameter_list)

Where:

• procedure_nameis the name of the stored procedure to be called.
• parameter_listis the input parameters required by the stored procedure, separated by commas.

Usage:

1. Specify the name of the stored procedure:This is the most important part of the CALL command, it clearly specifies The stored procedure to be called.
2. Provide input parameters (optional):The stored procedure may require input parameters, and these parameters need to be provided within parentheses. If the stored procedure does not require parameters, the parentheses can be omitted.

Example:

Call a stored procedure namedget_employee_info, whereemployee_idis the input parameter:

CALL get_employee_info(100)

Advantages:

Using the CALL command to call stored procedures has the following advantages:

• Code reuse:Yes Encapsulate commonly used functions into stored procedures and call them at any time through the CALL command to avoid code duplication.
• Security:Stored procedures can restrict access to specific data, thereby enhancing database security.
• Performance optimization:The stored procedure is compiled and optimized to improve execution performance.

Notes:

• Permissions:The user must have the permissions required to call the stored procedure.
• Parameter order:Input parameters must be provided in the order defined by the stored procedure.
• Output parameters:Stored procedures can return output parameters, but they need to be explicitly declared using the OUT or IN OUT keywords.

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