.net barcode reader sdk FETCH direction [ FROM | IN ] cursor in .NET framework

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FETCH direction [ FROM | IN ] cursor
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Direction NEXT PRIOR FIRST LAST ABSOLUTE count RELATIVE count Count ALL FORWARD FORWARD count FORWARD ALL BACKWARD BACKWARD count BACKWARD ALL
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Description Fetch the next record in the result set (the default if no direction is specified) Fetch the previous record in the result set Fetch the first record of the result set Fetch the last record of the result set Fetch the count th record in the result set Fetch the count th record from the current location in the result set Fetch the next count records in the result set Fetch all remaining records in the result set Fetch the next record in the result set (same as NEXT) Fetch the next count records in the result set Fetch all of the remaining records in the result set Fetch the previous record in the result set (same as PRIOR) Fetch the previous count records in the result set Fetch all of the previous records in the result set
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Table 7-1 FETCH Direction Options
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Obviously cursor is the cursor name used in the DECLARE command to open the cursor The direction parameter specifies the direction within the result set to get the next record from Remember, if the cursor was created using the NO SCROLL option, you can only move forward in the result set Table 7-1 shows the various direction values you can use The MOVE command uses the exact same format and parameters as the FETCH command, but only moves the cursor to the new location without displaying any of the result set records To test out the cursor functions, you should insert some records into one of your test tables and play around with the various direction parameters Here are a few examples of using the FETCH and MOVE commands in a result set:
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test=> begin; BEGIN test=> declare all_customers cursor for select "CustomerID",
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test-> "LastName","FirstName" from store"Customer" test-> order by "CustomerID"; DECLARE CURSOR test=> fetch all from all_customers; CustomerID | LastName | FirstName + + BLU001 | Blum | Rich BLU002 | Blum | Barbara WIL001 | Williams | Frank WIL002 | Williams | Melanie WIL003 | Williams | Nick WIS001 | Wisecarver | Emma WIS002 | Wisecarver | Ian WIS003 | Wisecarver | Bryce (8 rows)
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When the DECLARE command is executed, the cursor points to the first record in the result set The FETCH command displays all of the records in the result set, leaving the cursor at the end of the result set If you try to fetch the next record, no error will be produced, but you will not get any records returned:
test=> fetch next from all_customers; CustomerID | LastName | FirstName + + (0 rows)
To retrieve the first record in the result set, you can use the FIRST direction:
test=> fetch first from all_customers; CustomerID | LastName | FirstName + + BLU001 | Blum | Rich (1 row)
Now the cursor points to the first record in the result set When you use another FETCH command, you will retrieve records relative to the first record, where the cursor points to:
test=> fetch 3 from all_customers; CustomerID | LastName | FirstName + + BLU002 | Blum | Barbara WIL001 | Williams | Frank WIL002 | Williams | Melanie (3 rows)
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The three records after the first record are displayed, and the cursor is set to the last record that is displayed So far so good, but look at what happens when you display the previous two records:
test=> fetch backward 2 from all_customers; CustomerID | LastName | FirstName + + WIL001 | Williams | Frank BLU002 | Blum | Barbara (2 rows)
The previous two records were displayed, but in reverse order from how they were in the result set This is an important thing to realize when moving backward in the result set The records are displayed in the order based on the direction the cursor is moving When the cursor is moving backward, the records are displayed in reverse order When the cursor is moving forward, the records are displayed in normal order Another common mistake happens when using the MOVE command The MOVE command moves the cursor to a particular record within the result set without displaying any records Often you will see a beginner try to move the cursor to the first record of the result set, then attempt to use a FETCH command to display the record:
test=> move first in all_customers; MOVE 1 test=> fetch next from all_customers; CustomerID | LastName | FirstName + + BLU002 | Blum | Barbara (1 row) test=>
Notice that the FETCH command retrieved the second record in the result set, not the first Most likely this is not the result that was intended The MOVE FIRST command moves the pointer to the first record in the result set, but the FETCH NEXT command retrieves the next record, which is actually the second record in the result set If you need to retrieve the record that the cursor currently points to, you can use the FETCH 0 command:
test=> move first in all_customers; MOVE 1 test=> fetch 0 from all_customers; CustomerID | LastName | FirstName + + BLU001 | Blum | Rich (1 row) test=>
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