What are stored procedures and the advantages of using stored procedures

Stored procedures make it easier to manage databases, display information about databases and their users. Stored procedures are precompiled collections of SQL statements and optional control flow statements, stored as a name and processed as a unit. Stored procedures are stored in the database and can be executed through calls from the application, and allow user-declared variables, conditional execution, and other powerful programming capabilities.

Stored procedures can contain program flow, logical relationships, and queries against the database. They can accept parameters, output parameters, return single or multiple result sets, and return values.

L can use stored procedures for any purpose that uses SQL statements, and it has the following advantages:

L can execute a series of SQL statements in a single stored procedure.

L can refer to other stored procedures from within your stored procedure, which simplifies a series of complex statements.

The stored procedure is compiled on the server at creation time, so it executes faster than a single SQL statement.

A stored procedure is an executable object that is stored in a database. Calling a stored procedure is similar to invoking an SQL command. Using stored procedures on the data source (rather than executing or preparing statements in a client application) can provide several advantages, including higher performance, lower network overhead, and improved consistency and accuracy.

Stored procedures can have any number of input or output parameters (including 0), and can pass a return value. You can hard-code the value of a parameter to a specific data value, or you can use a parameter marker (a question mark "?"). ）。

The OLE DB provider (SQLOLEDB) for SQL Server supports the following mechanisms used by stored procedures to return data:

Each SELECT statement in the L process produces a result set.

The L process can return data through an output parameter.

The L procedure can have an integer return code.