71 lines
2.1 KiB
Python
71 lines
2.1 KiB
Python
#------------------------------------------------------------------------------
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# Copyright 2016, 2017, Oracle and/or its affiliates. All rights reserved.
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#
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# Portions Copyright 2007-2015, Anthony Tuininga. All rights reserved.
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#
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# Portions Copyright 2001-2007, Computronix (Canada) Ltd., Edmonton, Alberta,
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# Canada. All rights reserved.
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#------------------------------------------------------------------------------
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#------------------------------------------------------------------------------
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# ScrollableCursors.py
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# This script demonstrates how to use scrollable cursors. These allow moving
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# forward and backward in the result set but incur additional overhead on the
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# server to retain this information.
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#------------------------------------------------------------------------------
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from __future__ import print_function
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import cx_Oracle
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con = cx_Oracle.connect("cx_Oracle/dev@localhost/orcl")
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# show all of the rows available in the table
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cur = con.cursor()
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cur.execute("select * from TestStrings order by IntCol")
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print("ALL ROWS")
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for row in cur:
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print(row)
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print()
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# create a scrollable cursor
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cur = con.cursor(scrollable = True)
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# set array size smaller than the default (100) to force scrolling by the
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# database; otherwise, scrolling occurs directly within the buffers
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cur.arraysize = 3
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cur.execute("select * from TestStrings order by IntCol")
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# scroll to last row in the result set; the first parameter is not needed and
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# is ignored)
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cur.scroll(mode = "last")
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print("LAST ROW")
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print(cur.fetchone())
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print()
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# scroll to the first row in the result set; the first parameter not needed and
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# is ignored
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cur.scroll(mode = "first")
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print("FIRST ROW")
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print(cur.fetchone())
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print()
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# scroll to an absolute row number
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cur.scroll(5, mode = "absolute")
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print("ROW 5")
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print(cur.fetchone())
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print()
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# scroll forward six rows (the mode parameter defaults to relative)
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cur.scroll(3)
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print("SKIP 3 ROWS")
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print(cur.fetchone())
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print()
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# scroll backward four rows (the mode parameter defaults to relative)
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cur.scroll(-4)
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print("SKIP BACK 4 ROWS")
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print(cur.fetchone())
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print()
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