1/23/2024 0 Comments Mariadb stored procedureIt increases the counter ( counter ) by the value specified by the inc parameter. In this example, the stored procedure SetCounter() accepts one INOUT parameter ( counter ) and one IN parameter ( inc ). The following example demonstrates how to use an INOUT parameter in a stored procedure: DELIMITER $$ To get the number of orders that are in process, you call the stored procedure GetOrderCountByStatus as follows: CALL GetOrderCountByStatus( 'In AS total_in_process Code language: SQL (Structured Query Language) ( sql )ġ row in set (0.00 sec) Code language: JavaScript ( javascript ) The INOUT parameter example CALL GetOrderCountByStatus( Code language: SQL (Structured Query Language) ( sql )ġ row in set (0.00 sec) Code language: JavaScript ( javascript ) To find the number of orders that already shipped, you call GetOrderCountByStatus and pass the order status as of Shipped, and also pass a session variable ( ) to receive the return value. The total is the OUT parameter that stores the number of orders in a specific status.The orderStatus is the IN parameter specifies the status of orders to return.The stored procedure GetOrderCountByStatus() has two parameters: The following defines a stored procedure that returns the number of orders based on their order status. Incorrect number of arguments for PROCEDURE classicmodels.GetOfficeB圜ountry expected 1, got 0 Code language: JavaScript ( javascript ) The OUT parameter example If you don’t do so, you’ll get an error: CALL GetOfficeB圜ountry() Code language: SQL (Structured Query Language) ( sql ) To find offices in France, you pass the literal string France to the GetOfficeB圜ountry stored procedure as follows: CALL GetOfficeB圜ountry( 'France') Code language: SQL (Structured Query Language) ( sql )īecause the countryName is the IN parameter, you must pass an argument. Suppose that you want to find offices located in the USA, you need to pass an argument ( USA) to the stored procedure as shown in the following query: CALL GetOfficeB圜ountry( 'USA') Code language: SQL (Structured Query Language) ( sql ) In this example, the countryName is the IN parameter of the stored procedure. The following example creates a stored procedure that finds all offices that are located in a country specified by the input parameter countryName: DELIMITER //ĭELIMITER Code language: SQL (Structured Query Language) ( sql ) Let’s explore some examples of using stored procedure parameters. MySQL stored procedure parameter examples Third, define the data type and maximum length of the parameter.The parameter name must follow the naming rules of the column name in MySQL. Second, provide the name of the parameter.First, specify the parameter mode, which can be IN, OUT or INOUT depending on the purpose of the parameter in the stored procedure.Here is the basic syntax for defining a parameter in stored procedures: parameter_name datatype Code language: SQL (Structured Query Language) ( sql ) This means that the calling program may pass the argument, and the stored procedure can modify the INOUT parameter and pass the new value back to the calling program. INOUT parametersĪn INOUT parameter is a combination of IN and OUT parameters. Note that stored procedures cannot access the initial value of the OUT parameter when they begin. The value of an OUT parameter can be modified within the stored procedure, and its updated value is then passed back to the calling program. In other words, the stored procedure works only on the copy of the IN parameter. This means that even if you change the value of the IN parameter inside the stored procedure, its original value remains unchanged after the stored procedure ends. When defining an IN parameter in a stored procedure, the calling program must pass an argument to the stored procedure.Īdditionally, the value of an IN parameter is protected. Typically, stored procedures have parameters, making them more useful and reusable.Ī parameter in a stored procedure has one of three modes: IN, OUT, or INOUT. Introduction to MySQL stored procedure parameters Summary: in this tutorial, you will learn how to create stored procedures with parameters, including IN, OUT, and INTOUT parameters.
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