How to call stored procedure in oracle

Oracle is a relational database management system that can be used to process large amounts of data. It has many functions and features to help users process data. One of the important features is stored procedures. A stored procedure is a set of previously written program code that can be called multiple times in the database. In this article, we will learn how to call stored procedures in Oracle.

In Oracle, creating a stored procedure is a very simple process. It is defined through the PL/SQL language. A stored procedure is a PL/SQL block with parameters. The following is an example of a simple stored procedure:

CREATE OR REPLACE PROCEDURE MyProc (p_param1 IN NUMBER, p_param2 OUT NUMBER)
AS
BEGIN

p_param2 := p_param1 * 2;

END;

In this example, we define a stored procedure named "MyProc", which has two parameters "p_param1" and "p_param2". In the body of the stored procedure, we multiply p_param1 by 2 and store the result in p_param2.

We can use the following command to execute this stored procedure:

DECLARE

v_num1 NUMBER := 5;
v_num2 NUMBER;

BEGIN

MyProc(v_num1, v_num2);
DBMS_OUTPUT.PUT_LINE('Result : ' || v_num2);

END;

Here, we First define two variables v_num1 and v_num2, then call the stored procedure "MyProc", passing v_num1 as an input parameter, and v_num2 as an output parameter to receive the result. Finally, we use DBMS_OUTPUT.PUT_LINE to output the calculation results.

The process of calling stored procedures in Oracle is not complicated, you only need to use a specific syntax format. The basic syntax is as follows:

EXEC MyProc(p_param1, p_param2);

In this syntax, "MyProc" is the name of the stored procedure we want to call, "p_param1" and "p_param2" are the parameters passed to the stored procedure. Don't forget to add the EXEC keyword before executing the stored procedure.

When using Oracle's stored procedure call, we need to pay attention to some details. For example, before executing the stored procedure, please ensure that the data type has been correctly defined for each stored procedure parameter, otherwise the stored procedure will not work properly. . Additionally, within a stored procedure you can call other stored procedures, which can be very useful in certain situations.

In this article, we have seen how to call stored procedures in Oracle and also understood the basic syntax of stored procedures. Considering that Oracle stored procedures can be complex, we recommend that you read Oracle official documentation carefully when using stored procedures, be careful when writing and calling stored procedures, and use appropriate error handling techniques to avoid potential errors.

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