Now, you should know how to use a PL/SQL cursor with parameters to fetch data from the database tables. When we opened the cursor, we did not pass any arguments therefore, the cursor used the default values, 2017 for inyear and 1 for incustomerid. Note that a local temp table is unusable if you are using dynamic sql. In this example, we declared a parameterized cursor with default values. Set = + + sp_executesql in a global temp table #base_target with data from the unpivot. tgtįrom STG_CustomSource.INFORMATION_SCHEMA.COLUMNSĪnd COLUMN_NAME NOT IN (‘Practice’, ‘BudgetVersion’,’dimDateKey’,’LoadCycleKey’,’LoadCreatedTS’,’LoadModifiedTS’) The unpivot command has an IN clause that won’t accept a nested subselect so we had to use a cursor to build up the SQL Select dynamically.
CostCenter, MonthYear, GrossRevenueAmount, NetRevenueAmount, ProfitAmount where the list of Amounts is changing on a yearly basis. For example we have a source for our budgets where the budget categories get updated every year and the data comes to the warehouse from an excel spreadsheet in a form that has to be unpivoted. Db2 chooses a table space to use for the temporary result table.
Database cursor free#
PRINT as VARCHAR (50)) + ' ' + NEXT FROM INTO 7: Close the cursor.ĬLOSE 8: Deallocate the cursor to free up any memory or open result sets.Īgree with an earlier observation that typically you want to avoid cursors in favor of anything that is set based for performance reasons. To use a static scrollable cursor, you must first create a work file database and at least one table space with a 32KB page size in this database because a static scrollable cursor requires a temporary table for its result table while the cursor is open. In the loop print out the ID and the name from the result set and fetch the net row. The 'firstname' and 'lastname' columns from the database cursor will appear in the matching columns in the data grid.
Step 1: Declare variables to hold the output from the cursor.įETCH NEXT FROM INTO 6: Loop until there are no more results. You can create Cursor object using the cursor () method of the Connection. Using the methods of it you can execute SQL statements, fetch data from the result sets, call procedures. Now to convert it to a cursor, instead of just a select statement. The MySQLCursor of mysql-connector-python (and similar libraries) is used to execute statements to communicate with the MySQL database. Note: If you are new to SQL Server and come from an Oracle background, you should know that cursors on SQL Server are different from those on Oracle.īefore creating the cursor, we will just start with a simple query that will end up being used in the cursor. It may not be the best way to work with a set of data, but if you need to loop row by agonizing row (RBAR) in a T-SQL script then a cursor is one way of doing it. Overview Guides Reference Samples Design & Quality. Cursors are created by the connection.cursor() method: they are bound to the.
Database cursor code#
In SQL Server the cursor is a tool that is used to iterate over a result set, or to loop through each row of a result set one row at a time. Language English Bahasa Indonesia Espaol Amrica Latina Portugus Brasil. Allows Python code to execute PostgreSQL command in a database session. For more information on cursors, also take a look at the free SQL query training provided by Steve Stedman.