Stored procedures by thanveer danish melayi
May 25, 2015
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Stored Procedures
Muhammed Thanveer [email protected]
Muhammed Thanveer Danish MelayiMuhammed Thanveer M
typing speed:25
what is stored procedureA stored procedure is a group of sql statements that has been created and stored in the database.
Stored procedure will accept input parameters so that a single procedure can be used over the network by several clients using different input data. Stored procedure will reduce network traffic and increase the performance
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Advantages of using stored procedures a) Stored procedure allows modular programming. You can create the procedure once, store it in the database, and call it any number of times in your program.
b) Stored Procedure allows faster execution. if the operation requires a large amount of SQL code is performed repetitively, stored procedures can be faster. c) Stored Procedure can reduce network traffic. An operation requiring hundreds of lines of Transact-SQL code can be performed through a single statement that executes the code in a procedure, rather than by sending hundreds of lines of code over the network.
d) Stored procedures provide better security to your dataUsers can be granted permission to execute a stored procedure even if they do not have permission to execute the procedure's statements directly.
Syntax of stored procedure
CREATE PROCEDURE <procedure name>
<Param> <datatype> as
Begin <Body of procedure>
End //call <procedure name>(param
value);
example for spCreate table tbl_login( Vchr_name varchar(50), V chr_userid varchar(50) ); Create table tbl_user( Vchr_user_name varchar(50), Vchr_password varchar(50) ); Create procedure insert_value ( @name varchar(50), @userid varchar(50), @username varchar(50), @password varchar(50) ) As Begin Insert into tbl_login,tbl_user(vchr_name,vchr_user_id,vchr_username,vchr_password) values(@name,@userid,@username,@password) end exec insert_ value ‘ram’,’102’,’akhil’,’12345’;
cursors Cursor is a variable in SQL Server Database which is used
for row-by row operations. The cursor is so named because it indicates the current position in the resultset.
Use of cursor We use cursor when we need to update records in a
database table in singleton fashion means row by row.
example for cursorDeclare Cursor SQL Comand is used to define the cursor with many options that impact the scalablity and loading behaviour of the cursor. The basic syntax is given below1. DECLARE cursor_name CURSOR2. [LOCAL | GLOBAL] --define cursor scope3. [FORWARD_ONLY | SCROLL] --define cursor movements (forward/backward)4. [STATIC | KEYSET | DYNAMIC | FAST_FORWARD] --basic type of cursor5. [READ_ONLY | SCROLL_LOCKS | OPTIMISTIC] --define locks6. FOR select_statement --define SQL Select statement7. FOR UPDATE [col1,col2,...coln] --define columns that need to be updated
exampleCREATE PROCEDURE Usp_cursor_test
AS BEGIN
–Declaring the variables needed for cursor to store data
DECLARE @Name VARCHAR(50) DECLARE @EmptypeID INT
–Declaring the Cursor cur_print For name and Emptypeid in the Employeedetails table
DECLARE cur_print CURSOR FOR SELECT name,
emptypeid FROM employee.employeedetails
–After declaring we have to open the cursor OPEN cur_print
–retreives the First row from cursor and storing it into the variables.
FETCH NEXT FROM cur_print INTO @Name, @EmptypeID – @@FETCH_STATUS returns the status of the last
cursor FETCH statement issued against – any cursor currently opened by the
connection. – @@FETCH_STATUS = 0 means The FETCH statement
was successful. – @FETCH_STATUS = -1 The FETCH statement failed
or the row was beyond the result set. – @@FETCH_STATUS = -2 The row fetched is
missing. WHILE @@FETCH_STATUS = 0
BEGIN
Operations need to be done,Here just printing the variables
PRINT @Name PRINT @EmptypeID
–retreives the NExt row from cursor and storing it into the variables.
FETCH NEXT FROM cur_print INTO @Name, @EmptypeID END
–Closing the cursor CLOSE cur_print
– removes the cursor reference and relase cursor from memory
– very Important DEALLOCATE cur_print
END
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