What does cursor mean?

What does cursor mean?

: a movable item used to mark a position: such as. a : a transparent slide with a line attached to a slide rule. b : a visual cue (such as a flashing vertical line) on a video display that indicates position (as for data entry)

What does cursor look like?

The text cursor is typically a straight vertical line or I-shaped object that flashes in a line of text. Typically, when you are typing a paper, the cursor will be at the end of the line, because you are adding new text to the uncharted white area of the page.

What is cursor for 1st class?

1) A cursor is the position indicator on a computer display screen where a user can enter text. Typically, the pointing cursor is an arrow and the text entry position cursor is a blinking underscore or vertical bar. Most operating systems allow the user to choose another appearance for the cursor.

What is cursor status?

An application uses the cursor status property to determine how a cancel operation has affected a cursor. CS_CUR_STATUS is a command structure property and cannot be retrieved at the connection or context levels. Cursor properties are useful to gateway applications that send cursor information to clients.

What are the different types of cursor?

PL/SQL – Cursors

  • Implicit Cursors. Implicit cursors are automatically created by Oracle whenever an SQL statement is executed, when there is no explicit cursor for the statement.
  • Explicit Cursors.
  • Declaring the Cursor.
  • Opening the Cursor.
  • Fetching the Cursor.
  • Closing the Cursor.

How do I know if my cursor exists?

“check if cursor already exists” Code Answer

  1. IF CURSOR_STATUS(‘global’,’myCursor’)>=-1.
  2. BEGIN.
  3. DEALLOCATE myCursor.
  4. END.

How do I run a SQL cursor?

To use cursors in SQL procedures, you need to do the following:

  1. Declare a cursor that defines a result set.
  2. Open the cursor to establish the result set.
  3. Fetch the data into local variables as needed from the cursor, one row at a time.
  4. Close the cursor when done.

Which is faster cursor or while loop?

While SQL While loop is quicker than a cursor, reason found that cursor is defined by DECLARE CURSOR. Every emphasis of the loop will be executed inside system memory and consuming required server assets.

What is cursor explain with example?

A cursor is a temporary work area created in the system memory when a SQL statement is executed. A cursor can hold more than one row, but can process only one row at a time. The set of rows the cursor holds is called the active set. There are two types of cursors in PL/SQL : Implicit cursors.

How do I create a cursor?

  1. Declare Cursor: A cursor is declared by defining the SQL statement that returns a result set.
  2. Open: A Cursor is opened and populated by executing the SQL statement defined by the cursor.
  3. Fetch: When the cursor is opened, rows can be fetched from the cursor one by one or in a block to perform data manipulation.

Can we declare a cursor inside begin?

You can declare multiple cursors in the same pl/sql block. There is no need to declare the second cursor after you’ve opened the first cursor! Any time you see a nested cursor loop, you should IMMEDIATELY stop and look to see if you can combine the queries into a single select statement.

What is cursor and its types?

Cursor is a Temporary Memory or Temporary Work Station. It is Allocated by Database Server at the Time of Performing DML operations on Table by User. Cursors are used to store Database Tables. There are 2 types of Cursors: Implicit Cursors, and Explicit Cursors.

What is cursor declaration?

DECLARE CURSOR defines the attributes of a Transact-SQL server cursor, such as its scrolling behavior and the query used to build the result set on which the cursor operates. The OPEN statement populates the result set, and FETCH returns a row from the result set.

Which is the correct cursor declaration?

A cursor body must have a SELECT statement and the same RETURN clause as its corresponding cursor spec. Also, the number, order, and datatypes of select items in the SELECT clause must match the RETURN clause. You must declare a cursor before referencing it in an OPEN , FETCH , or CLOSE statement.

Which type of cursor is automatically declared?

21) Which type of cursor is automatically declared by Oracle every time an SQL statement is executed? Explanation: The implicit cursor are automatically created.

Why is a cursor called a cursor?

Origin of the term Cursor is Latin for ‘runner. ‘ A cursor is the name given to the transparent slide engraved with a hairline that is used for marking a point on a slide rule. The term was then transferred to computers through analogy.

What is difference between pointer and cursor?

The “Pointer” or “Mouse Pointer”: It is the graphical object that moves on screen. The “Cursor”: It is the file or the memory block used to encode and save the animated (ANI) or static (CUR) graphical object.

What is hand cursor called?

The cursor is the small image that you move around on the screen, usually using a mouse or touch pad, when you want to point on something or click on a button or link. It is also called a pointer, but today pointer refer to a specific cursor, the one that looks like a hand with an extended index finger.

What is a cursor on a laptop?

A cursor is a moveable icon (generally moved with the mouse) that shows the user where any input into the computer will be placed or where an action will occur. For example, if the cursor is moved on the screen to a button in a program or application and the mouse left button is clicked, it will action.

Why can’t I see my mouse pointer?

Depending on your keyboard and mouse model, the Windows keys you should hit are varying from one to another. Thus you may try the following combinations to make your disappearing cursor back to visible in Windows 10: Fn + F3/ Fn + F5/ Fn + F9/ Fn + F11. Press Windows + R keys altogether to bring out the Run box.

How do you unlock the cursor on a laptop?

If you want to use the mouse only without using the touchpad, you can turn the touchpad off. To lock the touchpad function, press the Fn + F5 keys. Alternatively, press the Fn Lock key and then F5 key to unlock the touchpad function.

How do I unfreeze my cursor?

Look for a touchpad icon (often F5, F7 or F9) and: Press this key. If this fails:* Press this key in unison with the “Fn” (function) key at the bottom of your laptop (often located between the “Ctrl” and “Alt” keys).

What to do if cursor stops working?

Look for a Touchpad switch on the keyboard The first thing to do is check for any button on your keyboard which has an icon that looks like a touchpad with a line through it. Press it and see if the cursor starts moving again. If not, check your row of function keys at the top of the keyboard.