What are the different types of cursor in SQL Server?

What are the different types of cursor in SQL Server?

SQL Server supports three cursor implementations.

• Transact-SQL cursors. Transact-SQL cursors are based on the DECLARE CURSOR syntax and used mainly in Transact-SQL scripts, stored procedures, and triggers.
• Application programming interface (API) server cursors.
• Client cursors.
• Forward-only.
• Static.
• Keyset.
• Dynamic.

What are cursors give different types of cursors?

There are 2 types of Cursors: Implicit Cursors, and Explicit Cursors….How to create Explicit Cursor:

• Declare Cursor Object.
• Open Cursor Connection.
• Fetch Data from cursor.
• Close cursor connection.
• Deallocate cursor memory.

What are the differences between procedures and cursors in SQL?

A function or procedure is a set of instructions to perform some task. A cursor is an array that can stores the result set of a query. Stored procedures are pre-compiled objects and executes as bulk of statements, whereas cursors are used to execute row by row.

How do cursors work 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.

Can we use cursor in procedure?

To use cursors in SQL procedures, you need to do the following: Declare a cursor that defines a result set. Open the cursor to establish the result set. Fetch the data into local variables as needed from the cursor, one row at a time.

How are the cursors implemented in SQL Server?

Client cursors. Client cursors are implemented internally by the SQL Server Native Client ODBC driver and by the DLL that implements the ADO API. Client cursors are implemented by caching all the result set rows on the client.

What’s the difference between Transact-SQL and API cursors?

Transact-SQL cursors and API cursors have different syntax, but the following general process is used with all SQL Server cursors: Associate a cursor with the result set of a Transact-SQL statement, and define characteristics of the cursor, such as whether the rows in the cursor can be updated.

Is there a forward only cursor in SQL Server?

Although the database API cursor models consider a forward-only cursor to be a distinct type of cursor, SQL Server does not. SQL Server considers both forward-only and scroll as options that can be applied to static, keyset-driven, and dynamic cursors.

How are the CURSOR types set in ODBC?

The ODBC cursor types are forward-only, static, keyset-driven, mixed, and dynamic. Setting the cursor type was the original method of specifying cursors in ODBC. Cursor behavior is set using the SQL_ATTR_CURSOR_SCROLLABLE and SQL_ATTR_CURSOR_SENSITIVITY attributes of SQLSetStmtAttr.