Using Advanced SQL in Visual Studio .NET

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Using Advanced SQL
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test=> rollback to first_point; ROLLBACK test=> commit; COMMIT test=> select * from store"Order" where "OrderID" = 'ORD004'; CustomerID | ProductID | Quantity | TotalCost | OrderID + + + + BLU001 | LAP001 | 2 | $1,00000 | ORD004 (1 row) test=>
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In this example, a savepoint named first_point was declared after the INSERT command When the UPDATE command failed, the ROLLBACK command was entered, using the specific savepoint name The transaction was rolled back to that point, and the COMMIT command was entered The transaction was processed just as if the command after the SAVEPOINT was never entered
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Earlier, the Revisiting the SELECT Command section of this chapter showed how to use the LIMIT and OFFSET parameters to walk your way through large result sets However, even these features can get cumbersome when working with large result sets Fortunately for us, there is an easier solution available SQL cursors are used as pointers within a result set returned from a SELECT command The cursor points to a specific row of data within the result set There is a subset of SQL commands available that allows you to work with the cursor, return data from a result set based on where the cursor is located, and move the cursor around within the result set A cursor is a temporary object and, by default, only exists within a transaction, although you can specify that the cursor stay active within an entire session When the transaction is terminated (either from a rollback or a commit) or the user terminates the session, PostgreSQL automatically deletes the cursor object You can also manually close a cursor object within a transaction if you need to The following sections show how to create and use a cursor in your transactions
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The DECLARE SQL command is used to create a new cursor The format of the DECLARE command in PostgreSQL is
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DECLARE cursorname [BINARY] [ [NO] SCROLL] CURSOR [ (WITH | WITHOUT) HOLD ] FOR query
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As you can tell from the command format, there are a few options available when you create the cursor: BINARY Allows you to use the result set as binary data instead of the default text data SCROLL Allows you to move backward within the result set (specifying NO SCROLL may increase performance if you do not need this feature) WITH HOLD Allows the cursor to stay active for the entire session (the default is WITHOUT HOLD, which deletes the cursor at the end of the transaction) The query parameter defines the SELECT command used to produce the result set Any valid SELECT command (including sub-selects) can be used to produce the result set for the cursor If you create a cursor without the hold property (which is the default), you must start a transaction using the BEGIN command before you can create the cursor:
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test=> begin; BEGIN test=> declare all_customers cursor for select * from store"Customer"; DECLARE CURSOR test=>
Notice that the result set for the SELECT command is not displayed automatically The cursor all_customers contains the data from the result set The next step is to use the cursor to view the data
Using a Cursor
When the cursor is created, it points to the first record in the result set You can now display records from the result set based on the location of the cursor As records are displayed, the cursor moves on to the next record There are a few commands that can be used for handling active cursors: FETCH Retrieves (displays) records from the result set and sets the cursor to the next record in the result set MOVE CLOSE Moves the cursor to another record without displaying records Removes the cursor before the end of the transaction
The FETCH command is the workhorse for cursors This is the command you use to maneuver around the result set and view the data The basic format for the FETCH command is
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