Open Multiple Cursors at the Same Time in Oracle

Q

Can Multiple Cursors Being Opened at the Same Time in Oracle?

✍: FYIcenter.com

A

Yes, multiple cursors can be opened at the same time. See the following example:

CREATE OR REPLACE PROCEDURE FYI_CENTER AS
  CURSOR emp_cur IS SELECT * FROM employees;
  emp_rec employees%ROWTYPE;
  CURSOR dpt_cur IS SELECT * FROM departments;
  dpt_rec departments%ROWTYPE;
BEGIN
  OPEN emp_cur;
  OPEN dpt_cur;
  FETCH emp_cur INTO emp_rec;
  FETCH dpt_cur INTO dpt_rec;
  DBMS_OUTPUT.PUT_LINE('Department name = ' || 
    dpt_rec.department_name); 
  DBMS_OUTPUT.PUT_LINE('Employee name = ' || 
    emp_rec.first_name || ' ' || emp_rec.last_name); 
  CLOSE emp_cur;
  CLOSE dpt_cur;
END;
/
Department name = Administration
Employee name = Steven King

⇒ Pass a Parameter to a Cursor in Oracle

⇐ Use an Explicit Cursor without OPEN Statements in Oracle

⇑ Working with Cursors in Oracle PL/SQL

⇑⇑ Oracle Database Tutorials

2018-04-07, 3080🔥, 0💬

Open a Cursor Variable in Oracle
How To Open a Cursor Variable in Oracle? A cursor variable must be opened with a specific query statement before you can fetch data fields from its data rows. To open a cursor variable, you can use the OPEN ... FOR statement as shown in the following tutorial exercise: CREATE OR REPLACE PROCEDURE FY... 2018-07-18, 2478🔥, 0💬

Retrieve Data from a Cursor to a RECORD in Oracle
How To Retrieve Data from a Cursor to a RECORD in Oracle? If you have a cursor opened ready to use, you can also use the FETCH statement to retrieve data from the cursor into a RECORD variable as shown in the tutorial exercise below: CREATE OR REPLACE PROCEDURE FYI_CENTER AS CURSOR t_list IS SELECT ... 2018-07-22, 2360🔥, 0💬

Define a Cursor Variable in Oracle
How To Define a Cursor Variable in Oracle? To define cursor variable, you must decide which REF CURSOR data type to use. There are 3 ways to select a REF CURSOR data type: Define your own specific REF CURSOR types using the TYPE ... RETURN statement. Define your own generic REF CURSOR type using the... 2018-07-18, 2346🔥, 0💬

What Is a Cursor Variable in Oracle
What Is a Cursor Variable in Oracle? A cursor variable is a variable of a specific REF CURSOR data type, which is a pointer to a data structure resource connects to query statement result, similar to the CURSOR data type.. The advantage of using cursor variables is that cursor variables can be used ... 2018-04-07, 2341🔥, 0💬

Use FETCH Statement in a Loop in Oracle
How To Use FETCH Statement in a Loop in Oracle? If you have a cursor opened ready to use, you can also use the FETCH statement in a loop to retrieve data from the cursor more efficiently. But you need to remember to use an EXIT statement break the loop when the cursor pointer reaches the end. The sc... 2018-04-07, 2231🔥, 0💬

Open and Close an Explicit Cursor in Oracle
How To Open and Close an Explicit Cursor in Oracle? An existing cursor can be opened or closed by the OPEN or CLOSE statement as shown in the following sample script: DECLARE CURSOR c_list IS SELECT * FROM countries; CURSOR t_list IS SELECT * FROM employees WHERE employee_id = 100; BEGIN OPEN c_list... 2018-07-22, 2222🔥, 0💬

Loop through a Cursor Variable in Oracle
How To Loop through a Cursor Variable in Oracle? Once a cursor variable is opened with a query statement, it will have the same attributes as a normal cursor and it can be used in the same way a normal cursor too. The following sample script shows you how to loop through a cursor variable: CREATE OR... 2018-07-18, 2210🔥, 0💬

Retrieve Data from an Explicit Cursor in Oracle
How To Retrieve Data from an Explicit Cursor in Oracle? If you have a cursor opened ready to use, you can use the FETCH ... INTO statement to retrieve data from the cursor into variables. FETCH statement will: Retrieve all the fields from the row pointed by the current cursor pointer and assign them... 2018-07-22, 2178🔥, 0💬

Use an Explicit Cursor without OPEN Statements in Oracle
How To Use an Explicit Cursor without OPEN Statements in Oracle? If you want to open a cursor and loop through its data rows in quick way, you can use the FOR ... IN ... LOOP statement in the same way as the implicit cursor. The following tutorial exercise gives you a good example: CREATE OR REPLACE... 2018-04-07, 2149🔥, 0💬

All rights in the contents of this web site are reserved by the individual author. fyicenter.com does not guarantee the truthfulness, accuracy, or reliability of any contents.