57 lines
2.0 KiB
Python
57 lines
2.0 KiB
Python
#------------------------------------------------------------------------------
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# Copyright (c) 2019, 2021, Oracle and/or its affiliates. All rights reserved.
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#------------------------------------------------------------------------------
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#------------------------------------------------------------------------------
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# last_rowid.py
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# Demonstrates the use of the cursor.lastrowid attribute.
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#
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# This script requires cx_Oracle 7.3 and higher.
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#------------------------------------------------------------------------------
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import cx_Oracle as oracledb
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import sample_env
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connection = oracledb.connect(sample_env.get_main_connect_string())
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row1 = [1, "First"]
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row2 = [2, "Second"]
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# insert a couple of rows and retain the rowid of each
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cursor = connection.cursor()
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cursor.execute("insert into mytab (id, data) values (:1, :2)", row1)
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rowid1 = cursor.lastrowid
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print("Row 1:", row1)
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print("Rowid 1:", rowid1)
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print()
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cursor.execute("insert into mytab (id, data) values (:1, :2)", row2)
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rowid2 = cursor.lastrowid
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print("Row 2:", row2)
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print("Rowid 2:", rowid2)
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print()
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# the row can be fetched with the rowid that was retained
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cursor.execute("select id, data from mytab where rowid = :1", [rowid1])
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print("Row 1:", cursor.fetchone())
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cursor.execute("select id, data from mytab where rowid = :1", [rowid2])
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print("Row 2:", cursor.fetchone())
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print()
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# updating multiple rows only returns the rowid of the last updated row
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cursor.execute("update mytab set data = data || ' (Modified)'")
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cursor.execute("select id, data from mytab where rowid = :1",
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[cursor.lastrowid])
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print("Last updated row:", cursor.fetchone())
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# deleting multiple rows only returns the rowid of the last deleted row
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cursor.execute("delete from mytab")
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print("Rowid of last deleted row:", cursor.lastrowid)
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# deleting no rows results in a value of None
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cursor.execute("delete from mytab")
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print("Rowid when no rows are deleted:", cursor.lastrowid)
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# Don't commit - this lets us run the demo multiple times
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#connection.commit()
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