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.
How do you see the output of a ref cursor?
Using the classic SQL*PLUS PRINT command to view the refcursor output will work in SQL Developer just like it would work in your command line tools. You execute your program, you create a local variable or 3 to ‘catch’ said output, and then you PRINT it.
Can ref cursor can be used with procedure out parameter?
The Oracle Database adapter provides support for strongly-typed and weakly-typed (SYS_REFCURSOR) REF CURSORs that can be passed to PL/SQL procedures and functions as IN, OUT, or IN OUT parameters.
How do you declare a ref cursor?
With a cursor variable, you simply pass the reference to that cursor. 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 . The following shows an example of a strong REF CURSOR .
What is 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.
Can we pass cursor as parameter?
No, you can’t pass a static cursor as a parameter.
What is ref cursor?
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.
What is the difference between ref cursor and Sys_refcursor?
There is no difference between using a type declared as REF CURSOR and using SYS_REFCURSOR , because SYS_REFCURSOR is defined in the STANDARD package as a REF CURSOR in the same way that we declared the type ref_cursor . type sys_refcursor is ref cursor; SYS_REFCURSOR was introduced in Oracle 9i.
What is ref cursor type of ref cursor and diff b W?
The ref cursor can be anything. 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.
What is strong ref cursor in Oracle?
A ref cursor which has fixed return type is called a Strong Ref Cursor in Oracle Database. Because of fixed return type, strong ref cursors can only be used selectively. For instance with those SELECT statements that return the result whose datatype matches with the one that you have fixed during cursor’s declaration.
What is SYS ref cursor?
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 strong ref cursor?
Which is the best definition of a REF CURSOR?
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.
What is the REF CURSOR variable in SQL?
The REF CURSOR variable is not a cursor, but a variable that points to a cursor. Before assigning a cursor variable, a cursor type must be defined. type author_cursor is ref cursor; This REF CURSORis a weak typed cursor variable because it does not define the datatype the cursor will return.
Are there any examples that contain only one cursor?
The example contains only ONE cursor. When c2 is assign the value of c1, both variables point to the same cursor. Remember that c1 and c2 are variables that point to or reference the actual cursor. The same basic example is shown below except, the output is generated by a local procedure.
What happens if cursor returns something other than its return type?
If a strongly typed cursor returns something other that its return type, a ROWTYPE_MISMATCH exception is raised. A strongly typed cursor type is less flexible but less prone to programming errors. The PL/SQL compiler will verify that the FETCH clause has the correct variable/record for the cursor return type at compile time.