What is difference between ref cursor and cursor?

A cursor is really any SQL statement that runs DML (select, insert, update, delete) on your database. A ref cursor is a pointer to a result set. This is normally used to open a query on the database server, then leave it up to the client to fetch the result it needs.

What are ref CURSORs in Oracle?

A REF CURSOR is a PL/SQL data type whose value is the memory address of a query work area on the database. In essence, a REF CURSOR is a pointer or a handle to a result set on the database. REF CURSOR s are represented through the OracleRefCursor ODP.NET class.

How do I return a cursor in Oracle?

1. You cannot do this using a standalone function, you’ll need to create a table type and a table function.
2. cur is a cursor not a sys_refcursor .
3. @a_horse_with_no_name Oracle version: 12c Standard Edition, 12.1.0.2.0.
4. Possible duplicate of Function return sys_refcursor call from sql with specific columns.

What is the advantage of ref cursor in Oracle?

The advantage that a ref cursor has over a plain cursor is that is can be passed as a variable to a procedure or a function. The ref cursor can be assigned to other ref cursor variables.

Do we need to close ref cursor in Oracle?

Best Answer RefCursor does not need to explicitly closed.

How do I view SQL output?

How do you see the result of DBMS_OUTPUT in SQL Developer? First, go to the View menu and select DBMS Output (shortcut is Alt+V, then D). This will display the DBMS Output panel.

What is difference between cursor and for loop?

Always confusing thing is which one is better; SQL While loop or cursor? 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 will happen if cursor is not closed in Oracle?

When you declare a cursor in a package (that is, not inside a subprogram of the package) and the cursor is opened, it will stay open until you explicitly close it or your session is terminated.

How do you generate file output from SQL?

Getting Started

1. If you want to save the results in a txt file, you can do this in SSMS. Go to Tools>Options:
2. Select the option Result to file:
3. Create a query and execute the query.
4. The result saved are the following:
5. SQLCMD.
6. PowerShell.
7. Import/Export Wizard in SSMS.
8. You will open the SQL Server Import and Export wizard:

How do I declare an output parameter in SQL?

Creating output parameters

1. parameter_name data_type OUTPUT.
2. CREATE PROCEDURE uspFindProductByModel ( @model_year SMALLINT, @product_count INT OUTPUT ) AS BEGIN SELECT product_name, list_price FROM production.products WHERE model_year = @model_year; SELECT @product_count = @@ROWCOUNT; END;
3. @product_count INT OUTPUT.

How do I get SQL query output in a text file?

How do I export SQL output?

Steps to export query results to CSV in SQL Developer

1. Step 1: Run your query. Firstly, you’ll need to run your query in SQL Developer.
2. Step 2: Open the Export Wizard.
3. Step 3: Select the CSV format and the location to export your file.
4. Step 4: Export query results to CSV.

How to use REF CURSOR example?

Given that block of code – you see perhaps the most “salient” difference – no matter how many times you run that block – cursor C will always be select

Another difference is a ref cursor can be returned to a client.

Another difference is a cursor can be global – a ref cursor cannot (you cannot define them OUTSIDE of a procedure/function).

How to call Oracle stored procedure which returns REF CURSOR?

Returning REF CURSORs from PL/SQL : Functions,Procedures and Implicit Statement Results

Complex Recordsets

Dynamic SQL Enhancements in Oracle 11g

Implicit Statement Results in Oracle Database 12c Release 1 (12.1)

How to execute dynamic SQL into cursor in Oracle?

EXECUTE IMMEDIATE Statement. The EXECUTE IMMEDIATE statement is the means by which native dynamic SQL processes most dynamic SQL statements.

OPEN FOR,FETCH,and CLOSE Statements. Use an OPEN FOR statement to associate a cursor variable with the dynamic SQL statement.

Repeated Placeholder Names in Dynamic SQL Statements.

What is the use of cursor in Oracle?

Implicit Cursor. Whenever any DML operations occur in the database,an implicit cursor is created that holds the rows affected,in that particular operation.

Explicit Cursor. Programmers are allowed to create named context area to execute their DML operations to get more control over it.

Cursor Attributes.

FOR Loop Cursor statement.