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Anonymous users2024-02-05Master the basic syntax, look at the implementation of functional requirements, and take a look at the well-written examples.
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Anonymous users2024-02-04First, the stored procedure runs faster because the SQL statement has been pre-deduced.
Second: Stored procedures can accept parameters, output parameters, return single or multiple result sets, and return values. You can return the error reason to the program.
Third: the stored procedure runs relatively stably and does not have too many errors. As long as it succeeds once, it will run according to this program in the future.
Fourth: Stored procedures run primarily on the server, reducing the strain on the client.
Fifth: Stored procedures can contain program flows, logic, and queries to the database. At the same time, the data logic can be physically encapsulated and hidden.
Sixth: A stored procedure can execute a series of SQL statements in a single stored procedure.
Seventh, stored procedures can reference other stored procedures from their own stored procedures, which can simplify a series of complex statements.
For example, if a table does not allow users to access directly, but requires users to access and modify one or more of the fields, then a stored procedure can be used to allow the user to use the stored procedure.
In addition, if data is returned as input data in the process of executing multiple SQL statements, if the SQL statements are directly executed, a large amount of data will inevitably be returned to the client through the network and computed on the client. If it is encapsulated in a stored procedure, the computation is performed on the server, which not only reduces the pressure on the client, but also reduces network traffic and improves the efficiency of execution.
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Anonymous users2024-02-03SQL calls can be divided into functions and stored procedures.
Personally, functions and stored procedures are similar, at least when referenced. Or simply think of a stored procedure as another function, another optimized function. Its advantage is that after being compiled, the stored procedure will be stored directly in the database, become part of the database, and can be called repeatedly later, running fast and efficient, which cannot be done by functions.
A stored procedure is a set of SQL statements in a large database system that are stored in the database in order to accomplish a specific function, and after the first compilation, they are called again without compiling again, and the user executes it by specifying the name of the stored procedure and giving parameters (if the stored procedure has parameters). A stored procedure is an important object in a database.
Category 1: System stored procedures.
It starts with sp and is used to set up the system. Get information. related management work.
2. Local stored procedures.
A user-created stored procedure is a stored procedure created by a user to complete a specific function, in fact, the stored procedure generally refers to the local stored procedure.
3. Temporary storage procedures.
There are two types of stored procedures:
The first is a local temporary stored procedure, with the hash sign ( ) as the first character of its name, then the stored procedure will become a local temporary stored procedure stored in the tempdb database, and only the user who created it can execute it;
The second is the global temporary stored procedure, which starts with two hash marks ( ), then the stored procedure will become a global temporary stored procedure stored in the tempdb database, once the global temporary stored procedure is created, any user who connects to the server can execute it in the future, and no specific permissions are required.
4. Remote storage procedures.
In SQL Server 2005, remote stored procedures are stored procedures that reside on a remote server, and can usually be executed using distributed queries and execute commands.
5. Extend the stored procedure.
Extended stored procedures are stored procedures that can be written by users in an external programming language, and the name of the extended stored procedure usually starts with XP.
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Anonymous users2024-02-02A system stored procedure is a stored procedure created by SQL Server to easily query information from system tables, or complete management tasks related to updating database tables or other system management tasks. System stored procedures can be executed in any database. System stored procedures are created and stored in the system database master, and their names start with sp or xp.
Some system processes can only be used by system administrators, while others can be used by other users through authorization.
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Anonymous users2024-02-01A stored procedure is simply a collection of SQL statements that are used to implement a certain function. The introduction of the profession can be found in the following link.
Hope it can help you and learn from each other.
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Anonymous users2024-01-31The stored procedure is to write the common or very complex work in advance with SQL statements and store them with a specified name, and such statements are placed in the database, and different SQL statements can also be executed according to the conditions, so when the database is called to provide the same service as the defined stored procedure, you only need to call execute, and the command can be automated. Advantages of Stored Procedures 1Stored procedures are only compiled at the time of creation, and they do not need to be recompiled every time they are executed in the future, while the SQL statements we usually use are compiled every time they are executed, so using stored procedures can improve the speed of database execution.
2.Complex business logic and database operations are often encountered, and SP is used to encapsulate database operations. When performing complex operations on a database, such as update, insert, query, and delete multiple tables, this complex operation can be encapsulated with stored procedures in conjunction with the transaction processing provided by the database.
It can greatly improve the efficiency of database use and reduce the execution time of programs, which is very important in the operation of databases with large data volumes. On the other hand, the separation of SQL statements and program statements can improve the readability of programs. 3.
Stored procedures can be set with parameters, and the same stored procedure can be reused according to the different parameters incoming, so as to effectively improve the optimization rate and readability. 4.High security, you can set the type of stored procedure that only a certain user has the right to use the specified stored procedure:
1) System storage procedure: It starts with sp and is used to set various settings of the system. Get information.
Related management work, such as sp help, is to get information about the specified object. (2) Extended stored procedures start with xp and are used to call the function provided by the operating system, exec masterxp_cmdshell 'ping '(3) User-defined stored procedures, which are the common formats of stored procedures that we refer to Template:
create procedure procedue name [@parameter data type][output][with] as sql statement Explanation: output: indicates that this parameter is passable back with recompile:
Indicates that this stored procedure is recompiled each time it is executed; encryption: The contents of the stored procedure created are encrypted.
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Anonymous users2024-01-30A stored procedure is a set of SQL statements in a large database system that is stored in a database and is permanently valid after a single compilation, and the user executes it by specifying the name of the stored procedure and giving parameters (if the stored procedure has parameters). A stored procedure is an important object in a database.
The essence of a database stored procedure is a set of definitions and SQL that are deployed on the database side. Commonly used or very complex work is written in SQL statements in advance and stored with a specified name, so that when the database is called to provide the same function as the defined stored procedures, the execute command can be automatically completed by calling execute.
Each parameter name should be preceded by an "@" symbol, and the parameters of each stored procedure are only used internally by the program, and the types of parameters can be used by other data types supported by SQL Server except image.
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Anonymous users2024-01-29Stored procedures are stored in a database and are permanently valid after a single compilation, and are invoked by the user to perform the function.
A stored procedure is a set of SQL statements that provide a specific function stored in the database for a large return database system, and it is permanently valid after compilation. The user can execute it by specifying the name of the stored procedure and giving parameters (if the stored procedure has parameters). The deposit-and-answer process is an important object in the database.
Languages such as stored procedures provide the following functions that allow users to design programs that meet the needs of the application: variable description; ANSI (National Organization for Standardization) compliant SQL commands (e.g. SELECT, UPDATE, etc.); General Process Control Commands (if...)else…、while….intrinsic functions.
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