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Today, what the editor shares with you is what is the difference between stored procedures and triggers in the database. Many people do not know much about it. Today, in order to make you better understand the difference between stored procedures and triggers in the database, so let's sum up the following contents. Let's move on. I'm sure you'll get something.

The differences between stored procedures and triggers are: stored procedures can take input parameters but triggers cannot; stored procedures can return zero or n values while triggers cannot return values, transactions can be used in stored procedures, but triggers do not allow

Stored procedures and triggers are very important knowledge in the database, and then we will compare the differences between them in many aspects. I hope it will be helpful to you.

1. What is a trigger?

A trigger is a process (code snippet) that is automatically executed when certain events occur in a table / view in a database. Triggers are mainly used to maintain the integrity of the database. Triggers are also used to enforce business rules, audit changes in the database, and replicate data. The most common trigger is to trigger a data manipulation language (DML) trigger when manipulating data. Some database systems support non-data triggers that are triggered when a data definition language (DDL) event occurs. These triggers can be used specifically for auditing. Oracle database system supports schema-level triggers

two。 What is a stored procedure?

Stored procedures are applications that can access a relational database by. Typically, stored procedures are used to validate data and control access to the database. If some data processing operations require the execution of multiple SQL statements, such operations are implemented as stored procedures. When calling a stored procedure, you must use CALL or EXECUTE statements. Stored procedures can return results (such as the results of a SELECT statement). These results can be used by other stored procedures or applications. The language used to write stored procedures usually supports control structures, such as if,while,for, and so on. Depending on the database system used, stored procedures can be implemented in multiple languages.

3. The difference between stored procedures and triggers

(1) A stored procedure is a set of SQL statements that have been created and stored in the database. So we can reuse the code over and over again. The trigger is a special type of stored procedure that is not directly called by the user. When a trigger is created, it is defined to be triggered when a specific type of data modification is made to a particular table or column.

(2) users can use Execute or Exec statements to call or execute stored procedures directly, but not triggers. When a related event is triggered, only the trigger is executed automatically.

(3) the stored procedure can take the input parameters, but we can't pass the parameters as input to the trigger.

(4) stored procedures can return zero or n values, but triggers cannot return values.

(5) We can use transactions in stored procedures, and transaction processing is not allowed in triggers.

(6) stored procedures are usually used to perform user-specified tasks, and triggers are usually used for audit work.

These are the details of what is the difference between stored procedures and triggers in the database, and do you have anything to gain after reading it? If you want to know more, welcome to the industry information!

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