52 lines
1.8 KiB
Python
52 lines
1.8 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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#------------------------------------------------------------------------------
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# ArrayDMLRowCounts.py
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#
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# Demonstrate the use of the 12.1 feature that allows cursor.executemany()
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# to return the number of rows affected by each individual execution as a list.
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# The parameter "arraydmlrowcounts" must be set to True in the call to
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# cursor.executemany() after which cursor.getarraydmlrowcounts() can be called.
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#
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# This script requires cx_Oracle 5.2 and higher.
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#------------------------------------------------------------------------------
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from __future__ import print_function
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import cx_Oracle
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import SampleEnv
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connection = cx_Oracle.Connection(SampleEnv.MAIN_CONNECT_STRING)
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cursor = connection.cursor()
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# show the number of rows for each parent ID as a means of verifying the
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# output from the delete statement
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for parentId, count in cursor.execute("""
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select ParentId, count(*)
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from ChildTable
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group by ParentId
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order by ParentId"""):
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print("Parent ID:", parentId, "has", int(count), "rows.")
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print()
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# delete the following parent IDs only
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parentIdsToDelete = [2, 3, 5]
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print("Deleting Parent IDs:", parentIdsToDelete)
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print()
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# enable array DML row counts for each iteration executed in executemany()
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cursor.executemany("""
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delete from ChildTable
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where ParentId = :1""",
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[(i,) for i in parentIdsToDelete],
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arraydmlrowcounts = True)
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# display the number of rows deleted for each parent ID
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rowCounts = cursor.getarraydmlrowcounts()
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for parentId, count in zip(parentIdsToDelete, rowCounts):
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print("Parent ID:", parentId, "deleted", count, "rows.")
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