What is SYS ref cursor in PL SQL?

SYS_REFCURSOR is a predefined weak ref cursor which means we do not have to define it into our code like we did with the explicit weak ref cursor in the previous tutorial. … First you have to create the “weak ref cursor type” and then you have to create “a cursor variable” using that ref cursor.

What is SYS ref cursor in Oracle?

SYS_REFCURSOR is a REF CURSOR type that allows any result set to be associated with it. This is known as a weakly-typed REF CURSOR. Only the declaration of SYS_REFCURSOR and user-defined REF CURSOR variables are different.

What is ref cursor in PL SQL?

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 ref cursor and its typeS?

A cursor variable is a variable that references to a cursor. Different from implicit and explicit cursors, a cursor variable is not tied to any specific query. … To declare a cursor variable, you use the REF CURSOR is the data type. PL/SQL has two forms of REF CURSOR typeS: strong typed and weak typed REF CURSOR .

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What is the difference between cursor and ref 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 is strong and weak ref cursor?

A strongly typed ref cursor always returns a known type, usually from a declared TYPE object. … A weakly typed ref cursor has a return type that is dependant on the SQL statement it executes, i.e. only once the cursor is opened is the type known (at runtime).

Can we commit inside a trigger?

Any change that a trigger does is committed with the transaction that fired the trigger. So yes, the change done inside the trigger will be committed “automatically”. You can’t commit inside a trigger anyway.

Is ref cursor return?

Since Oracle 7.3 the REF CURSOR type has been available to allow recordsets to be returned from stored procedures and functions. Oracle 9i introduced the predefined SYS_REFCURSOR type, meaning we no longer have to define our own REF CURSOR types.

What are the different types of cursor?

Types of cursors

  • STATIC CURSOR. A static cursor populates the result set during cursor creation and the query result is cached for the lifetime of the cursor. …
  • FAST_FORWARD. This is the default type of cursor. …
  • DYNAMIC. …
  • KEYSET.

How do I create a cursor?

You must declare a cursor before referencing it in an OPEN , FETCH , or CLOSE statement. You must declare a variable before referencing it in a cursor declaration. The word SQL is reserved by PL/SQL as the default name for implicit cursors, and cannot be used in a cursor declaration.

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What is the advantage of ref cursor in Oracle?

A ref cursor is a variable, defined as a cursor type, which will point to, or reference a cursor result. 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.

How do I make a cursor in SQL?

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.

What is the difference between a PL SQL cursor and PL SQL ref cursor?

Another difference is a ref cursor can be returned to a client. a plsql “cursor cursor” cannot be returned to a client. Another difference is a ref cursor can be passed from subroutine to subroutine — a cursor cannot be.

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