What is the difference between explicit cursor and cursor FOR loop?
What is the difference between explicit cursor and cursor FOR loop?
Unlike an implicit cursor, you can reference an explicit cursor or cursor variable by its name. Therefore, an explicit cursor or cursor variable is called a named cursor. The cursor FOR LOOP statement lets you run a SELECT statement and then immediately loop through the rows of the result set.
What is ref cursor in PL SQL examples?
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.
What is cursor types of cursor and diff b W cursors?
Difference between Implicit and Explicit Cursors :
| Implicit Cursors | Explicit Cursors |
|---|---|
| Implicit cursors are automatically created when select statements are executed. | Explicit cursors needs to be defined explicitly by the user by providing a name. |
| Closes automatically after execution. | Need to close after execution. |
What is a ref cursor in Oracle examples?
What is Pragma Autonomous_transaction in Oracle with example?
The AUTONOMOUS_TRANSACTION pragma changes the way a subprogram works within a transaction. A subprogram marked with this pragma can do SQL operations and commit or roll back those operations, without committing or rolling back the data in the main transaction.
What is the difference between cursor and loop?
Cursors in sql server allow you to fetch a set of data, loop through each record, and modify the values as necessary; then, you can easily assign these values to variables and perform processing on these values. While loop also same as cursor to fetch set of data and process each row in sql server.
Is reference cursor static in nature?
The Ref-Cursors does not pass the entire result set in a huge sack, rather it just hands over the reference of that cursor to the calling program, thus making it more performance friendly. These can also be dynamic, meaning that they can process dynamic SQL statements, whilst the explicit cursors are static in nature.
What are 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.
Can we write commit in trigger?
You can’t commit inside a trigger anyway. Show activity on this post. Trigger should not commit and cannot commit. Committing in a trigger usually raises an exception unless it happens into autonomous transaction.
How to use record to loop a REF CURSOR?
Returning REF CURSORs from PL/SQL : Functions,Procedures and Implicit Statement Results
What is REF CURSOR in Oracle?
– First, declare an updatable cursor that updates credits of the customers whose credits are greater than zero. – Next, loop over the rows in the cursors. – Then, get the number of orders for each customer. – After that, assign the credit increment based on the order count. – Finally, update the credit of the customer.
What is the difference between REF CURSOR?
An application: The application processes the results record by record.
What is REF CURSOR in PL/SQL?
A REF CURSOR refers to a memory address on the database.