Let's execute the following program to update the table and increase salary of each customer by 5000. It returns the number of rows affected by DML statements like INSERT, DELETE, and UPDATE or returned by a SELECT INTO statement.Ĭreate customers table and have records: ID It always returns FALSE for implicit cursors, because the SQL cursor is automatically closed after executing its associated SQL statements. Its return value is TRUE if DML statements like INSERT, DELETE and UPDATE affect no row, or a SELECT INTO statement return no rows. Its return value is TRUE if DML statements like INSERT, DELETE and UPDATE affect at least one row or more rows or a SELECT INTO statement returned one or more rows. The following table soecifies the status of the cursor with each of its attribute. It will return an error if there no data is selected. If you run a SELECT INTO statement in PL/SQL block, the implicit cursor attribute can be used to find out whether any row has been returned by the SELECT statement. Some of them are: %FOUND, %NOTFOUND, %ROWCOUNT and %ISOPEN.įor example: When you execute the SQL statements like INSERT, UPDATE, DELETE then the cursor attributes tell whether any rows are affected and how many have been affected.
Frees any cursor locks on the rows by the cursor. Closing SQL cursor performs three tasks: Releases the result set currently held by the cursor. Database application programming interface. Once the rows are fetched one by one and manipulated as per requirement, the next step is to close the SQL cursor. You can use the following two methods to create a cursor in SQL Server: The T-SQL language, which supports the syntax for using cursors modelled after the Sql-92 cursor syntax. Orcale provides some attributes known as Implicit cursor's attributes to check the status of DML operations. Provide T-SQL statements in scripts, stored procedures, and triggers, to access the data in the resultset. These are created by default to process the statements when DML statements like INSERT, UPDATE, DELETE etc. The implicit cursors are automatically generated by Oracle while an SQL statement is executed, if you don't use an explicit cursor for the statement. A cursor contains information on a select statement and the rows of data accessed by it.Ī cursor is used to referred to a program to fetch and process the rows returned by the SQL statement, one at a time. In PL/SQL, the context area is controlled by Cursor. It contains all information needed for processing the statement. Hold Shift+Option, then click and drag your cursor. Through the medium of this article on Cursor in SQL I will be giving you all the necessary details that you must be needing before you get your feet wet with it. A cursor is a pointer to this context area. PopSQL supports a number of keyboard tricks that gives you multiple cursors Drag for multiple cursors. Cursors in SQL form an integral part of any database which basically helps a user in traversing through the database without much hassle. When an SQL statement is processed, Oracle creates a memory area known as context area.