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Cursors enable the processing of rows in the given result set in the following ways:/* Create two variables that would store the values returned by the fetch statement */DECLARE @Department Name char(25)DECLARE @Department Head char(25)/* Define the cursor that can be used to access the records of the table,row by row */DECLARE cur Department cursor for SELECT v Department Name,v Department Head from Department-- Open the cursor OPEN cur Department-- Fetch the rows into variables FETCH cur Department into @Department Name,@Department Head--Start a loop to display all the rows of the cursor WHILE(@@fetch_status=0)BEGINPrint 'Department Name =' @Department Name Print 'Department Head =' @Department Head--Fetch the next row from the cursor FETCH cur Department into @Department Name,@Department Head END-- Close the cursor CLOSE cur Department-- Deallocate the cursor DEALLOCATE cur Department The following are various types of cursors available in SQL Server 2005: Base table: Base table cursors are the lowest level of cursor available.Base table cursors can scroll forward or backward with minimal cost, and can be updated Static: Cursors can move to any record but the changes on the data can't be seen. Cursors can move anywhere and all the changes on the data can be viewed.I hope that this has provided enough of a practical idea about Array List.Next we will discuss the Bit Array in the same collection class.Constraints can be specified when the table is created (inside the CREATE TABLE statement) or after the table is created (inside the ALTER TABLE statement).
String Builder and String class String A string is a sequential collection of Unicode characters that represent text. Concat method concatenates one or more instances of a String. Write Line (string1); string string2 = "Hi " "This is Jitendra ";string2 = "Sampathi Rao."; Console. Every time you use one of the methods in the System. String Builder class can be used when you want to modify a string without creating a new object. While coding, we look for classes that can reduce manual operation.
String is a class that belongs to the namespace System. String concatenation can be done using the ' ' opearator or the String. Sample code string string1 = "Today is " Date Time. Write Line(string2); String Builder String Builder is a class that belongs to the namespace System. String class, you create a new string object in memory, that requires a new allocation of space for that new object. For example, using the String Builder class can boost performance when concatenating many strings together in a loop. What is the difference between array and array list? For instance if you want to sort the values in an array then you need to do the manual operations.
In situations where you need to perform repeated modifications to a string, the overhead associated with creating a new String object can be costly. Here obviously we look for the classes that can automate the sorting by just calling a method. Collections namespace has many classes for the individual purpose.
Forward-only: The cursor moves forward but can't move backward.
Keyset-driven: Only updated data can be viewed, deleted and inserted data cannot be viewed.