The key to calling MySQL stored procedures is to clarify the stored procedure name and parameters, and use CALL statements or programming interfaces to call. 1. Call directly using CALL statement: such as CALL get_user_info(123); When multi-parameters, you need to fill in order and pay attention to type matching; 2. Call in client tools: such as MySQL Workbench executes CALL statements, if there is no return value, you can check data changes or log confirmation effect; 3. Process output parameters: define the results received by user variables, such as CALL get_total_orders(1, @total); SELECT @total; 4. Call from program code: such as Python uses cursor.callproc() method to pass in parameters and process the results. When calling, special attention should be paid to parameter order and type matching issues to avoid errors.
It is actually not difficult to call stored procedures in MySQL, as long as you know the name of the stored procedure and the parameters it needs. The following are some common methods and operation steps suitable for users who are new to MySQL.
Call directly using CALL statement
This is the most common and easiest way. You just need to use the CALL command to add the stored procedure name and parameters.
For example, you have a stored procedure called get_user_info , which accepts a user ID parameter:
CALL get_user_info(123);
If your stored procedure has multiple parameters, remember to fill in it in order, for example:
CALL update_order_status(456, 'completed');
Note: The parameter types must match, otherwise an error will be reported. If it is a string, it should be enclosed in quotes; if it is a number, it is not necessary.
Called in client tools (such as MySQL Workbench)
Many graphical tools support calling stored procedures. You can open a query window, write a CALL statement like above, and then run it.
Sometimes you will see "execution succeeds but no results", which may be because your stored procedure is just doing data processing and does not return any value. At this time, you can check whether it affects the data or check the log to confirm the execution effect.
Processing stored procedures with output parameters
Some stored procedures do not output the result directly, but return the value through the parameters. In this case, you need to define the variable first and then pass it in.
For example:
CALL get_total_orders(1, @total); SELECT @total;
Here @total is a user variable used to receive output results. After the call is finished, use SELECT to view its value.
If there are many parameters, and some are inputs and some are outputs, it is recommended to carefully check the order and type of parameters when writing to avoid errors.
Called from program code (such as PHP, Python)
If you are developing an application, you may need to connect to MySQL in a programming language and call stored procedures. Taking Python as an example, you can use cursor.callproc() method:
cursor.callproc('get_user_info', [123])
for result in cursor.stored_results():
print(result.fetchall())Different languages ??have different ways, but the principle is the same: specify the stored procedure name, pass in parameters, and process returns the result.
Basically that's it. The key to calling a stored procedure is to understand its parameter requirements and to use the CALL syntax or the corresponding programming interface correctly. Although it seems simple, the parameter type and order are prone to errors, so it is best to confirm clearly before calling.
The above is the detailed content of how to call a stored procedure in mysql. For more information, please follow other related articles on the PHP Chinese website!
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