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 are the typeS of cursor?
There are 2 types of Cursors: Implicit Cursors, and Explicit Cursors. These are explained as following below. Implicit Cursors: Implicit Cursors are also known as Default Cursors of SQL SERVER.
What is Oracle Pragma?
The PRAGMA keyword is used to signify that the remainder of the PL/SQL statement is a pragma, or directive, to the compiler. Tells the PL/SQL runtime engine to commit or roll back any changes made to the database inside the current block without affecting the main or outer transaction. …
What is cursor explain cursor type?
A cursor is a temporary work area created in the system memory when a SQL statement is executed. A cursor contains information on a select statement and the rows of data accessed by it. There are two types of cursors in PL/SQL : Implicit cursors.
How are ref cursors used in Oracle 9i?
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. Related articles.
What are the types of REF CURSOR in PL / SQL?
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. DECLARE TYPE customer_t IS REF CURSOR RETURN customers%ROWTYPE; c_customer customer_t;
How to use Ref cursors to return records?
Using Ref Cursors. The example below uses a ref cursor to return a subset of the records in the EMP table. The following procedure opens a query using a SYS_REFCURSOR output parameter. Notice the cursor is not closed in the procedure. It is up to the calling code to manage the cursor once it has been opened.
Is the ref variable a cursor or a variable?
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. This REF CURSORis a weak typed cursor variable because it does not define the datatype the cursor will return. Below is the same cursor that is strongly typed.
How do I run a ref cursor in Oracle?
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 a cursor Plsql?
A cursor contains information on a select statement and the rows of data accessed by it. A cursor is used to referred to a program to fetch and process the rows returned by the SQL statement, one at a time. There are two types of cursors: Implicit Cursors.
What is cursor and ref cursor in Oracle?
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 ref cursor be used with procedure out parameter yes or no?
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 I view stored procedure results in SQL Developer?
Below the sproc i have pasted the PL/SQL block of code that is saved when you right click and “Run” the sproc. When you click ok after you modify the PL/SQL block window with the code below you click “OK” and it will display the records.
What does a REF CURSOR do in Oracle?
Using REF CURSORs is one of the most powerful, flexible, and scalable ways to return query results from an Oracle Database to a client application. 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.
Can a REF CURSOR be used to return a recordet?
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 kind of cursor variable does PL / SQL use?
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. This form of cursor variable called strong typed REF CURSOR because the cursor variable is always associated with a specific record structure, or type.