What is ref cursor example?
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.
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 .
What is the 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 the use of Sys_refcursor 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.
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.
What is ref cursor in PostgreSQL?
Declaring cursors PostgreSQL provides you with a special type called REFCURSOR to declare a cursor variable. Then, you put the CURSOR keyword followed by a list of comma-separated arguments ( name datatype ) that defines parameters for the query. These arguments will be substituted by values when the cursor is opened.
What is cursor variable?
A cursor variable is a cursor that contains a pointer to a query result set. A cursor variable, unlike a static cursor, is not associated with a particular query. The same cursor variable can be opened a number of times with separate OPEN FOR statements containing different queries.
Can we write cursor inside begin?
In general, yes you can, you just nest another execution block inside your current one…
How do I create a ref cursor in PostgreSQL?
One way to create a cursor variable is just to declare it as a variable of type refcursor. Another way is to use the cursor declaration syntax, which in general is: name [ [ NO ] SCROLL ] CURSOR [ ( arguments ) ] FOR query; (FOR can be replaced by IS for Oracle compatibility.)
