Already on GitHub? We also use third-party cookies that help us analyze and understand how you use this website. connection_hostname almost certainly not a SELECT statement but something else. Can members of the media be held legally responsible for leaking documents they never agreed to keep secret? can one turn left and right at a red light with dual lane turns? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. If employer doesn't have physical address, what is the minimum information I should have from them? 4 How to use Django DB connection cursor in Python? DB: Microsoft SQL Server Standard (64-bit), Version 12.0.6024.0 Why is a "TeX point" slightly larger than an "American point"? print(result) How can I access environment variables in Python? connection = pyodbc.connect(connect_string) If it implements the standard PEP for cursors (, The philosopher who believes in Web Assembly, Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. 214. Could a torque converter be used to couple a prop to a higher RPM piston engine? import pyodbc. If you're OK posting the SQL, please do, otherwise please check it to make sure it is a single SELECT statement (however complex it might be). 90% of the time, the query will execute successfully and a dataframe is returned, then 10% of the time cursor.description is empty. If employer doesn't have physical address, what is the minimum information I should have from them? If you want to fully generalize a routine that performs SQL Select Queries Following workaround is working reliable for both versions v.4.0.24 and v.4.0.25: Edit (2019-01-16): Microsoft contributes to the pyODBC open-source community and is an active participant in the repository at https://github.com/mkleehammer/pyodbc/. 2021-02-13 04:55:27,546 - INFO - Attempting to connect to 192.168.20.117 What are possible reasons a sound may be continually clicking (low amplitude, no sudden changes in amplitude), a result set containing zero or more rows of data, or. By using zip we pick the 1st to n entry and zip them together like a the zipper in you pants. columns = [col_desc[0] for col_desc in cursor.description]. Not the answer you're looking for? Each row of returned data is represented in the returned list as a list of field (column) values. @BenLutgens Because the example produces a. Update: by default, pypyodbc sets lowercase = True. Please note that you'll have to import psycopg2.extras for that to work. What PHILOSOPHERS understand for intelligence? If you are working with postgresql and you are using psycopg2 you could use some goodies from psycopg2 to achieve the same by specifying the cursorfactory being a DictCursor when creating your cursor from the connection, like this: cur = conn.cursor( cursor_factory=psycopg2.extras.DictCursor ). The text was updated successfully, but these errors were encountered: What version of unixODBC are you using? no data for table columns is available. The table itself can be accessed: if cursor.tables(table='SOURCE').fetchone(): print('yes it does') Viewed 3k times. What I needed, which is slightly different than what OP was asking for: I like @bryan and @foo-stack answers. If you are working with postgresql and you are using psycopg2 you could use some goodies from psycopg2 to If your version of the ODBC driver is 1 Web PyOdbc docs # columns in table x for row in cursor.columns(table='x'): print(row.column_name) www.PyOdbc wiki API docs for row in cursor.description: print row[0] BUT' columns = [col_desc[0] for col_desc in cursor.description] TypeError: 'NoneType' object is not iterable import pyodbc import pandas as pd conn = second query that I posted about is technically a few different selects Using pyodbc my standard start is something like. Connect and share knowledge within a single location that is structured and easy to search. These cookies track visitors across websites and collect information to provide customized ads. So the user chooses what suits him in which case. yes it does. contain special To subscribe to this RSS feed, copy and paste this URL into your RSS reader. http://dev.mysql.com/doc/connector-python/en/connector-python-example-cursor-select.html Their example only returns a tuple. Apologies, the formatting seems to have gotten lost.. How to determine chain length on a Brompton? If necessary I could post redacted versions of these queries with column The following are 30 code examples for showing how to use django.db.connection.cursor () . Yes, that's the idea, although you'll probably want to get the number of records and the description from the cursor rather than the rows themselves (which I'm guessing will be rather a lot): Ran using the following code, same error as above. Learn more about Teams But I found this way neat, as its also injection safe. the docs for details. I can only suggest you start These are Openbase is the leading platform for developers to discover and choose open-source. I can confirm that the query being executed is in fact a sql query and as part of my debugging I am printing out the query being passed to pyodbc and can confirm the same query passed compiles successfully when executed manually. no data for query columns is available) and the query will fail with the aforementioned error. The dataframe is returned without column names. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. query like "SELECT col1 FROM table1 LIMIT 1" using just pyodbc and see if This website uses cookies to improve your experience while you navigate through the website. then it looks like the SQL statement itself is the issue here. The iterator, cursor.description, is sometimes empty (i.e. Attachment: Zip of ODBC Trace files (SUCCESS log (v.4.0.24) and FAIL log (v.4.0.25). rev2023.4.17.43393. You can vote up the ones you like or vote down the ones you dont like, and go to the original project or source file by following the links above each example. Why is a "TeX point" slightly larger than an "American point"? These cookies will be stored in your browser only with your consent. Quick example when cursor is OK: sending them to an external API that does not accept batches (you have no choice, though saving to file first is probably better); when not OK: Updating column3 to some value if column1 > column2 (this should be done via a single update statement on the entire table). In this way, the routine doing the database call doesn't need to know anything about the data that it's handling. Querying Informix table using pyodbc produces ODBC SQL type -103 is not yet supported error. for col in cursor.columns(table='SOURCE'): print(col.column_name) How can I detect when a signal becomes noisy? Using pyodbc to import column name with non alphanumeric characters? line 132, in query_sql Analytical cookies are used to understand how visitors interact with the website. Lastly, there's always the remote possibility your query Again v.4.0.24 does not show this inconsistency. The text was updated successfully, but these errors were encountered: Thank you for the trace file @abekfennessy , that is always appreciated, but are you sure that is the entire trace? Alternative ways to code something like a table within a table? support Python 2.7. Are you sure your SQL is just a SELECT If you don't know columns ahead of time, use Cursor.description to build a list of column names and zip with each row to produce a list of dictionaries. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. to your account. print("Columns are none!!!!!!! Sci-fi episode where children were actually adults, Review invitation of an article that overly cites me and the journal. f"DATABASE={self.database};UID={self.username};PWD={self.password};" This cookie is set by GDPR Cookie Consent plugin. sql_logs.zip, Python: 2.7.15 # Has to be set before creating the cursor, so we must recreate self.cursor. Example <. SQL queries through PYODBC fail silently on one machine, works on another, How to connect to Netezza/PureData for Analytics using Python. This cookie is set by GDPR Cookie Consent plugin. close the cursor when you're done with it. I'm going to close this due to inactivity, but we are all interested in the results. implements the DB API 2.0 specification but is How can I detect when a signal becomes noisy? It implements the DB API 2.0 specification but is packed with even more Pythonic That's an indexed version, not the most beautiful solution but it will work. If the error returned is still "No results. Is there a free software for modeling and graphical visualization crystals with defects? Mike Sipser and Wikipedia seem to disagree on Chomsky's normal form. pyodbc: 4.0.25 I like @bryan and @foo-stack answers. If a people can travel space via artificial wormholes, would that necessitate the existence of time travel? It seems the issue is somehow related to a timeout or something similar in Lastly, there's always the remote possibility your query is bringing back multiple result sets, so you may need to call nextset() to get the result set (and description) you're looking for. [u'DateTime', It does not store any personal data. Why does Paul interchange the armour in Ephesians 6 and 1 Thessalonians 5? The code that I am executing is as follows: Q&A for work. Using @Beargle's result with bottlepy, I was able to create this very concise query exposing endpoint: @route('/api/query/') I'll give both these a shot, thank you. I have the same problem as @gisofer Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. <. Also getting column description using Cursor.description works fine. I see it is a pyodbc bug in the 4.0.25 version. large is iterating through several different extraction processes. I use python every day with a heavy emphasis on database work. New external SSD acting up, no eject option. Nevertheless, I will attempt to recreate the issue with trace logs and send another trace file. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". Not the answer you're looking for? ), or even a call to a stored procedure perhaps. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. pyODBC uses the Microsoft ODBC driver for SQL Server. Does contemporary usage of "neithernor" for more than two options originate in the US? I am still on pyodbc 4.0.30, my query has not changed, and my MySql version has not changed. How to select database in django db collection custom query? contain special characters / emojis) and the use of more unusual data types, perhaps specific to MySQL. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Assuming you know you column names! Thanks, but is there a generalised solution for when I don't know my column names? Why is Noether's theorem not guaranteed by calculus? The fix is to start the anonymous code block with SET NOCOUNT ON; which suppresses the row count and only returns the result set: For anyone else who is still getting this error, I have found that for some statements (A window function that aggregated null values) I also need to include SET ANSI_WARNINGS OFF;. Previous SQL was not a query. Each row of returned data is represented in the returned list as a list of field (column) values. is bringing back multiple result sets, so you may need to call nextset() Please note that you'll have to import psycopg2.extras for that to work. You can dump all results to the csv file without looping: Wouldn't that fit the entire result set in memory, @MilovanTomaevi? On Sat, Feb 13, 2021 at 19:39 Keith Erskine ***@***. I feel like having ODBC cursor structures as they are has something to do with allowing multiple cursors through the same connection to reduce connection cost and such. WebContribute to film42/pyodbc-modified development by creating an account on GitHub. associated with them, this argument provides names for the Asking for help, clarification, or responding to other answers. are two different queries and the process fails at random. WebAlmost totally same usage as pyodbc (can be seen as a re-implementation of pyodbc in pure Python via ctypes) Simple - the whole module is implemented in a single python The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. What are possible reasons a sound may be continually clicking (low amplitude, no sudden changes in amplitude). Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. As you might be aware when you add * to a list you basically strips away the list, leaving the individual list entries as parameters to the function you are calling. Here is such a routine: I like @bryan and @foo-stack answers. Optional Two-Phase Commit Extensions Many databases have Theorems in set theory that use computability theory tools, and vice versa. Making statements based on opinion; back them up with references or personal experience. Evaluating the limit of two sums/sequences. crsr.columns(table='') should return always the column description for the given table, "observed behavior". If you don't know columns ahead of time, use Cursor.description to build a list of column names and zip with each row to produce a list of dictionaries. You can overwrite this like this: import pypyodbc; pypyodbc.lowercase = False. File "/usr/local/lib/python3.7/site-packages/pandas/io/sql.py", line 1766, in read_query 5 How to create a dictcursor in Python MySQL? ***> wrote: Asking for help, clarification, or responding to other answers. can one turn left and right at a red light with dual lane turns? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, needed to wrap parentheses around print (columns) and print (results) for this to work. Connect and share knowledge within a single location that is structured and easy to search. Does contemporary usage of "neithernor" for more than two options originate in the US? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. If you dont know columns ahead of time, use Cursor.description to build a list of column names and zip with each row to produce a list of dictionaries. Making statements based on opinion; back them up with references or personal experience. Do we really need a pyodbc cursor and why? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Keep in mind that in this example, Name is specific to the column name of the database being referenced. pyodbc.ProgrammingError: No results. Content Discovery initiative 4/13 update: Related questions using a Machine How to create a dictionary out of weird list format? The proposed workaround is not reliable, cause cursor.columns(table=table_name) is not complete: By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Making statements based on opinion; back them up with references or personal experience. You get, e.g. That seems odd. Thanks for contributing an answer to Stack Overflow! We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. On Windows, be FWIW, I also added option=4 to my connection string. What sort of contractor retrofits kitchen exhaust ducts in the US? Specfically.. Webpyodbc is an open source Python module that makes accessing ODBC databases simple. If you don't know columns ahead of time, use Cursor.description to build a list of column names and zip with each row to produce a list of dictionaries. pyODBC uses the Microsoft ODBC driver for SQL Server. Manually raising (throwing) an exception in Python. rev2023.4.17.43393. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. If the error returned is still "No results. These examples are extracted from open source projects. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. pd.read_sql_query(sql_query, sql_connection, chunksize=int(chunk_size))` I imagine the creators of MySQL would eventually do this for us? Therefore, I would think the below outcomes are acceptable, in order of preference. nature. Asking for help, clarification, or responding to other answers. Asking for help, clarification, or responding to other answers. ` Why cant you just execute directly from a connection like. else: statement, or is it a SQL script that includes multiple SQL statements? Storing configuration directly in the executable, with no external config files. But opting out of some of these cookies may affect your browsing experience. Python: 2.7.14, pyodbc: 4.0.26 is definitely still an issue. " Note: This error was produced using MySQL ODBC 8.0.22 Unicode Driver making it the second driver that I've produced this error on. Please let me know what additional information might be helpful and thank you! What sort of contractor retrofits kitchen exhaust ducts in the US? It Column names to use. If I had put that together I would have closed #506 as a duplicate, but since I posted to patch against it I will close this as a duplicate. @BenyGj Yeah, this is not intended for large amounts of data. Find centralized, trusted content and collaborate around the technologies you use most. crsr.columns(table='') sometimes iterator is empty i.e. And how to capitalize on that? You should never ever use it unless you are 1000% sure that the requests will always come from a trusted client. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. In the scenario you described, I would normally expect a column count of 5. SQL command text that contains multiple SQL statements is called an anonymous code block. PyODBC is community-supported software. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Find centralized, trusted content and collaborate around the technologies you use most. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Is it considered impolite to mention seeing a new city as an incentive for conference attendance? I understand cursors are a big no-no with DBs because they indicate logic not founded in set theory, tend to push the host into low/zero levels of parallelization, and RBAR type operations, but I don't believe the ODBC cursor I'm declaring above is the same as a cursor we think of when we have our SQL Server engineering and administration hats on. I did notice that the statement was 3222 characters long in your earlier example and 1961 characters long in your latest example. I have written a nice little generalised schema gatherer: @FooStack Column names are already returned in, Output pyodbc cursor results as python dictionary, The philosopher who believes in Web Assembly, Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. columns : sequence, default None If dealing with small enough tables, you will not see a difference. rows = cursor.fetchall() Try a simple SELECT query like "SELECT col1 FROM table1 LIMIT 1" using just pyodbc and see if that works. The Two faces sharing same four vertices issues. Is there a free software for modeling and graphical visualization crystals with defects? Five columns selected from a table with one inner join to another table. connect_string = f"DRIVER={{{self.driver}}};SERVER={self.server};PORT={self.port}; " How do two equations multiply left by left equals right by right? By using zip we pick the 1st to n entry and zip them together like a the zipper in you pants. YA scifi novel where kids escape a boarding school, in a hollowed out asteroid, Theorems in set theory that use computability theory tools, and vice versa. result = cursor.fetchall() If your version of the ODBC driver is 17.1 or later, you can use the AAD interactive mode of the ODBC driver through pyODBC. Mainly going off @Torxed response, I created a full generalised set of functions to find the schema and data into a dictionary: Feel free to go all code-golf on this to reduce the lines; but in the meantime, it works! By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. http://www.databasejournal.com/features/mssql/article.php/3896206/What-Every-DBA-Ought-to-Know-About-SQL-Server-Cursors-and-Their-Alternatives.htm, The philosopher who believes in Web Assembly, Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. This is also seen in the logs you mentioned and in the error I'm getting now. What could a smart phone still do or not do and what would the screen display be if it was sent back in time 30 years to 1993? Connect and share knowledge within a single location that is structured and easy to search. I will be testing changes to sql.read_query to confirm that frame.from_records will return the resulting dataframe when columns is None. The query is a relatively simple one. WebSo if you were to make the comparison, the 'cursor' is like a ADODB.Command object. rev2023.4.17.43393. Tags: How can I remove a key from a Python dictionary? Another would be to index the column name as dictionary key with a list within each key containing the data in order of row number. Why don't objects get brighter when I reflect their light back at them? Web pandas MS SQL Server, pyodbc. Thank you @mkleehammer. To learn more, see our tips on writing great answers. database-cursor If you want to fully generalize a routine that performs SQL Select Queries, but you need to reference the results by an index number, not a name, you can do this, with a list of lists instead of a dictionary. Note, pyodbc contains C++ extensions so you will If you don't know columns ahead of time, use Cursor.description to build a list of column names and zip with each row to produce a list of dict How to intersect two lines that are not touching. Step 2: Create a SQL database for pyodbc Python development. When data is available is fully correct. This AAD interactive option works if Python and pyODBC allow the ODBC driver to pop up the dialog. It would be interesting to see if either of those approaches generate a proper query description. sql.read_query calls frame.from_records to convert the returned data into a dataframe. You don't use pyodbc to "print" anything, but you can use the csv module to dump the results of a pyodbc query to CSV. def query(q What could a smart phone still do or not do and what would the screen display be if it was sent back in time 30 years to 1993? SELECT statement (however complex it might be). and table names replaced. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. pyodbc: 4.0.25; OS: Docker python:3.7 i.e. If the passed data do not have names When connecting to other sources, the cursor.description var from pyodbc normally has the field names, but when I connect to snowflake the names are coming back in what looks like utf-16 that's been truncated. sure to specify 32-bit Python or 64-bit: I can execute queries against database and get data very reliably. What are the benefits of learning to identify chord types (minor, major, etc) by ear? pyodbc.ProgrammingError: No results. pyodbc cursor.description is empty and query results fail to be returned, cursor.columns doesn't return column names, pyodbc.cursor.columns doesn't always return table column information, https://github.com/notifications/unsubscribe-auth/ARZK6KXQ7PC344TBLSGDTF3S62JUFANCNFSM4XGZ4ZLA, https://github.com/mkleehammer/pyodbc/wiki/Cursor#nextset, https://github.com/notifications/unsubscribe-auth/ARZK6KV4XYO75D24FNHMIJTS64ZXHANCNFSM4XGZ4ZLA. Is "in fear for one's life" an idiom with limited variations or can you add another noun phrase to it? ODBCTrace.txt. Logs: You can query your database for the names of the table you're querying against. I have been trying to understand why I was getting an error when trying to read column names from a SQL table using the cursor.columns() command. How do I open modal pop in grid view button? Mainly going off @Torxed response, I created a full generalised set of functions to find the schema and data into a dictionary: def schema_dict(cur difference between cursor and connection objects. Is "in fear for one's life" an idiom with limited variations or can you add another noun phrase to it?
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