How to use stored procedures for oracle

A stored procedure is a set of SQL statements that can be stored in a database and can be called repeatedly as a separate unit. They can accept parameters (IN, OUT, INOUT) and provide the advantages of code reuse, security, performance and modularity. Example: Create a stored procedure calculate_sum to calculate the sum of two numbers and store them in the OUT parameter.

How to use Oracle stored procedures

1. What is a stored procedure?

A stored procedure is a set of SQL statements that can be created, compiled, and stored in a database. Unlike SQL statements that are executed separately, stored procedures can be called repeatedly as separate units.

2. Create stored procedures

To create a stored procedure, use the following syntax:

 <code>CREATE PROCEDURE procedure_name (parameter_list) AS BEGIN -- 存储过程的主体SQL 语句END;</code>

3. Parameters

Stored procedures can accept parameters that allow values ​​to be passed on when called. The parameter types can be IN (input), OUT (output), or INOUT (input and output).

4. Call stored procedures

You can call stored procedures using the following syntax:

 <code>CALL procedure_name (parameter_value1, parameter_value2, ...);</code>

5. Advantages

There are many advantages to using stored procedures, including:

• Code reuse: Stored procedures can reduce code duplication because the same logic can be called in multiple places.
• Security: Stored procedures protect sensitive data from unauthorized access.
• Performance: Compiled stored procedures usually execute faster than uncompiled SQL statements.
• Modularity: Stored procedures organize complex code into manageable units.

VI. Example

Here is a simple example that demonstrates how to create a stored procedure to calculate the sum of two numbers:

 <code>CREATE PROCEDURE calculate_sum ( IN num1 NUMBER, IN num2 NUMBER, OUT result NUMBER ) AS BEGIN result := num1 num2; END;</code>

Call this stored procedure:

 <code>CALL calculate_sum (5, 10, @result);</code>

@result The output parameter will store the calculated sum.

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