Can we write cursor inside procedure?

Can we write cursor inside procedure?

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

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

How do you declare a cursor?

There are four steps in using an Explicit Cursor.

  1. DECLARE the cursor in the Declaration section.
  2. OPEN the cursor in the Execution Section.
  3. FETCH the data from the cursor into PL/SQL variables or records in the Execution Section.
  4. CLOSE the cursor in the Execution Section before you end the PL/SQL Block.

Can we declare cursor in package specification?

The specification (spec for short) is the interface to the package. It declares the types, variables, constants, exceptions, cursors, and subprograms that can be referenced from outside the package.

What is the difference between procedure and cursor?

A function or procedure is a set of instructions to perform some task. A cursor is an array that can stores the result set of a query. Stored procedures are pre-compiled objects and executes as bulk of statements, whereas cursors are used to execute row by row.

How do you write a procedure in PL SQL?

Creating a Procedure

  1. procedure-name specifies the name of the procedure.
  2. [OR REPLACE] option allows the modification of an existing procedure.
  3. The optional parameter list contains name, mode and types of the parameters.
  4. procedure-body contains the executable part.

What is declare cursor?

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.

When cursor is used in SQL?

In SQL server, a cursor is used when you need Instead of the T-SQL commands that operate on all the rows in the result set one at a time, we use a cursor when we need to update records in a database table in a singleton fashion, in other words row by fetch one row at a time or row by row.

How define cursor in package?

Benefits of Cursor Declaration in Packages It is like global variable which you can use it in every program units in your database. DECLARE emp_rec emp%ROWTYPE; BEGIN OPEN pack_name. c1; LOOP FETCH pack_name. c1 INTO emp_rec; EXIT WHEN pack_name.

What is a package cursor?

In a package cursor, the SQL statement for the cursor is attached dynamically at runtime from calling procedures. Also read.

Where is the cursor defined in PL / SQL?

An explicit cursor should be defined in the declaration section of the PL/SQL Block. It is created on a SELECT Statement which returns more than one row. Declaring the cursor defines the cursor with a name and the associated SELECT statement. For example −

How to declare a cursor without any parameters in PLSQL?

Declaring a cursor without any parameters is the simplest cursor. Let’s take a closer look. Syntax. The syntax for a cursor without parameters in Oracle/PLSQL is: CURSOR cursor_name IS SELECT_statement; Example. For example, you could define a cursor called c1 as below. CURSOR c1 IS SELECT course_number FROM courses_tbl WHERE course_name = name_in;

Where do you create an explicit cursor in SQL?

Explicit Cursors. Explicit cursors are programmer-defined cursors for gaining more control over the context area. An explicit cursor should be defined in the declaration section of the PL/SQL Block. It is created on a SELECT Statement which returns more than one row.

What happens when you open a cursor in Oracle?

When you open a cursor, Oracle parses the query, binds variables, and executes the associated SQL statement. Oracle also determines an execution plan, associates host variables and cursor parameters with the placeholders in the SQL statement, determines the result set, and sets the cursor to the first row in…

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