83 lines
3.2 KiB
Python
83 lines
3.2 KiB
Python
#------------------------------------------------------------------------------
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# Copyright (c) 2019, 2022, Oracle and/or its affiliates.
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#
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# This software is dual-licensed to you under the Universal Permissive License
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# (UPL) 1.0 as shown at https://oss.oracle.com/licenses/upl and Apache License
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# 2.0 as shown at http://www.apache.org/licenses/LICENSE-2.0. You may choose
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# either license.
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#
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# If you elect to accept the software under the Apache License, Version 2.0,
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# the following applies:
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#------------------------------------------------------------------------------
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#------------------------------------------------------------------------------
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# last_rowid.py
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#
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# Demonstrates the use of the cursor.lastrowid attribute.
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#------------------------------------------------------------------------------
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import oracledb
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import sample_env
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# determine whether to use python-oracledb thin mode or thick mode
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if not sample_env.get_is_thin():
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oracledb.init_oracle_client(lib_dir=sample_env.get_oracle_client())
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connection = oracledb.connect(user=sample_env.get_main_user(),
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password=sample_env.get_main_password(),
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dsn=sample_env.get_connect_string())
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with connection.cursor() as cursor:
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# insert a couple of rows and retain the rowid of each
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row1 = [1, "First"]
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row2 = [2, "Second"]
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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 returned
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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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