def query(q yes it does. pd.read_sql_query(sql_query, sql_connection, chunksize=int(chunk_size))` It may be difficult to try this given the inconsistent nature of the bug though. Step 1: Configure development environment for pyodbc Python development. I'm fairly certain that that trace file should cover the issue. DROP INDEX ), or even a call to a stored procedure perhaps. Does Python have a ternary conditional operator? To learn more, see our tips on writing great answers. 2021-02-13 04:59:00,557 - INFO - Query executed.. File "/usr/local/lib/python3.7/site-packages/pandas/io/sql.py", line 1766, in read_query second query that I posted about is technically a few different selects TypeError: 'NoneType' object is not iterable. dictionary Is there a free software for modeling and graphical visualization crystals with defects? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Perhaps you could try re-running the code without the chunk size (instead use LIMIT to bring back just a few rows), or you could try taking pandas and/or SQLAlchemy out of the picture and call pyodbc directly. Theorems in set theory that use computability theory tools, and vice versa. Asking for help, clarification, or responding to other answers. Step 3: # Has to be set before creating the cursor, so we must recreate self.cursor. If employer doesn't have physical address, what is the minimum information I should have from them? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Only difference for creating logs: pyodbc.pyd exchanged (v.4.0.24 - v.4.0.25). I am reviewing a very bad paper - do I have to be nice? 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. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. These cookies track visitors across websites and collect information to provide customized ads. Importantly, Ive modified pyodbc.base.sql to pyodbc: 4.0.38 OS: Windows 10 Enterprise 20H2 64-bit DB: Impala driver: Cloudera ODBC Driver for Impala 2.06.16.1022 import pyodbc conn = connect 'DSN=Hadoop LDAP', autocommit=True cur = conn. cursor cur. Thanks for contributing an answer to Stack Overflow! columns). Manually raising (throwing) an exception in Python. I use python every day with a heavy emphasis on database work. Microsoft contributes to the pyODBC open-source community and is an active participant in the repository at https://github.com/mkleehammer/pyodbc/. 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. Five columns selected from a table with one inner join to another table. The following are 30 code examples for showing how to use django.db.connection.cursor () . Previous SQL was not a query. Not the answer you're looking for? no data for table columns is available. If you have a chance, could you check there isn't any more trace output that can be retrieved? I see it is a pyodbc bug in the 4.0.25 version. Good answer. data = self._fetchall_as_list(cursor) To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Is it possible to get more verbose logs out of the driver? Find centralized, trusted content and collaborate around the technologies you use most. They're often a source of performance problems, and a set-based approach is almost always better. The cookie is used to store the user consent for the cookies in the category "Analytics". So the user chooses what suits him in which case. What does the "yield" keyword do in Python? I can only suggest you start 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. How can I detect when a signal becomes noisy? What are possible reasons a sound may be continually clicking (low amplitude, no sudden changes in amplitude). Apologies, the formatting seems to have gotten lost.. You mentioned earlier that the SQL is just a SELECT that returns 5 columns. Necessary cookies are absolutely essential for the website to function properly. 2 How to get list of dictionaries in pyodbc? the docs for details. It How do I open modal pop in grid view button? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Database Cursors are reviled and mistrusted by DBA's, usually for good reason. Well occasionally send you account related emails. Current master (d5a8a7b) solved my problems - thanx. Not the answer you're looking for? Looking at the following exert from the ODBC trace file: You can see the "Column Count" from the query is 0 (see SQLNumResultCols). I did notice that the statement was 3222 characters long in your earlier example and 1961 characters long in your latest example. Assuming you know you column names! also execute successfully when using DBeaver. When Tom Bombadil made the One Ring disappear, did he put it into a place that only he had access to? 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. characters / emojis) and the use of more unusual data types, perhaps What does the SwingUtilities class do in Java? Can we create two different filesystems on a single partition? This cookie is set by GDPR Cookie Consent plugin. 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 ). Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Connect and share knowledge within a single location that is structured and easy to search. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. is bringing back multiple result sets, so you may need to call nextset() Yes, it's called SQL syntax. The server is a client server and therefore I am unable to upgrade MySql version, however the issue occurs both on MySql 8 and MySql 5.6. If you want to fully generalize a routine that performs SQL Select Queries On Sat, Feb 13, 2021 at 08:16 Keith Erskine ***@***. If your version of the ODBC driver is 1 Thanks for contributing an answer to Stack Overflow! in the result (any names not found in the data will become all-NA The issue has not appeared again since.. The steps are as follows: Import Libs: from pandas import DataFrame By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Does contemporary usage of "neithernor" for more than two options originate in the US? You can dump all results to the csv file without looping: Wouldn't that fit the entire result set in memory, @MilovanTomaevi? 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. How to create a dictcursor in Python MySQL? SELECT statement (however complex it might be). Previous SQL was not a query." Have a question about this project? Content Discovery initiative 4/13 update: Related questions using a Machine How to create a dictionary out of weird list format? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. @BenyGj Yeah, this is not intended for large amounts of data. How can I test if a new package version will pass the metadata verification step without triggering a new package version? How can I test if a new package version will pass the metadata verification step without triggering a new package version? I have the same problem as @gisofer rev2023.4.17.43393. Python: How can I find the dimensions of a matrix in Python? rows = cursor.fetchall() By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Please first make sure you have looked at: To diagnose, we usually need to know the following, including version numbers. Im using bottlepy and need to return dict so it can return it as JSON. did notice that the statement was 3222 characters long in your earlier 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' 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. I imagine the creators of MySQL would eventually do this for us? Thanks for contributing an answer to Stack Overflow! In testing I got this error with another query where I was not specifying a chunk size so I don't think that should be related. is a valid SQL Query. OS: Windows 10, version 1803, 64-bit python packed with even more Pythonic convenience. 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. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Recently, I changed jobs, and some of my new coworkers who typically use GUIs to work with their DB's started panicking when I demonstrated the above technique. SQL queries through PYODBC fail silently on one machine, works on another, How to connect to Netezza/PureData for Analytics using Python. Example How to get list of dictionaries in pyodbc? Why is Noether's theorem not guaranteed by calculus? WebContribute to film42/pyodbc-modified development by creating an account on GitHub. But I found this way neat, as its also injection safe. this just saved me a boatload of time. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. a more direct solution from beargle below! Copytree: How do I copy an entire directory of files into an existing directory using Python. Is there a way to use any communication without a CPU? Finding valid license for project utilizing AGPL 3.0 libraries, How small stars help with planet formation. Why does the second bowl of popcorn pop better in the microwave? What sort of contractor retrofits kitchen exhaust ducts in the US? You can query your database for the names of the table you're querying against. ODBCTrace.txt. specific to MySQL. But opting out of some of these cookies may affect your browsing experience. Debian 9 (Docker running on MacOS Mojave) DB: Netsuite (some Oracle SQL database flavour) driver: Netsuite I like @bryan and @foo-stack answers. 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. for col in cursor.columns(table='SOURCE'): print(col.column_name), TypeError: bad argument type for built-in operation. Can dialogue be put in the same paragraph as action text? 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. This cookie is set by GDPR Cookie Consent plugin. Asking for help, clarification, or responding to other answers. columns = [col_desc[0] for col_desc in cursor.description] TypeError: 'NoneType' object is not iterable import pyodbc import pandas as pd conn = That seems odd. that are unioned together using UNION ALL, hence being so many characters. How do I use pyodbc to print the whole query result including the columns to a csv file? Database cursors map to ODBC handles statements (HSTMTs). By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. How can I access environment variables in Python? 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. Sign in Using pyodbc my standard start is something like. Find centralized, trusted content and collaborate around the technologies you use most. More info about Internet Explorer and Microsoft Edge, Step 1: Configure development environment for pyodbc Python development, Step 2: Create a SQL database for pyodbc Python development, Step 3: Proof of concept connecting to SQL using pyodbc. Making statements based on opinion; back them up with references or personal experience. Does higher variance usually mean lower probability density? It would be interesting to see if either of those approaches generate a proper query description. 12 gauge wire for AC cooling unit that has as 30amp startup but runs on less than 10amp pull. The column names can be provided as the first entry of the returned list, so parsing the returned list in the calling routine can be really easy and flexible. are two different queries and the process fails at random. Debian 9 (Docker running on MacOS Mojave), DB: Netsuite (some Oracle SQL database flavour), driver: Netsuite ODBC driver Linux64bit 7.2.0.0050. The true error underlying the empty cursor.description is raised to the user. Can I ask for a refund or credit next year? UPDATE statement, or a statement that is not a data query (e.g. You associated with them, this argument provides names for the Why cant you just execute directly from a connection like. How to intersect two lines that are not touching. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. PyODBC is community-supported software. cursor = connection.cursor() Webdef test_lower_case (self): "Ensure pyodbc.lowercase forces returned column names to lowercase." to your account, Stack trace: You should never ever use it unless you are 1000% sure that the requests will always come from a trusted client. Thought I would update that this issue has randomly reappeared for me now, don't have any background just yet. , , , , . I will be testing changes to sql.read_query to confirm that frame.from_records will return the resulting dataframe when columns is None. My script at How to get list of dictionaries from cursor? Way off base? Those are fairly Already on GitHub? import pyodbc You can overwrite this like this: import pypyodbc; pypyodbc.lowercase = False. 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). pyODBC uses the Microsoft ODBC driver for SQL Server. By using zip we pick the 1st to n entry and zip them together like a the zipper in you pants. execute fine. The cookie is used to store the user consent for the cookies in the category "Performance". CODE: import pyodbc cnxn = pyodbc.connect( #DATA BASE NAME IS HERE, ". File "/usr/local/lib/python3.7/site-packages/pandas/io/sql.py", line 1779, in _fetchall_as_list In order to use a cursor, we have to prove that the performance of the cursor is better than processing the rows another way. operating systems this will build from source. Please note that you'll have to import psycopg2.extras for that to work. Connect and share knowledge within a single location that is structured and easy to search. Please note that you'll have to import psycopg2.extras for that to work. of things - column names that are somewhat "exotic" (e.g. 4 How to use Django DB connection cursor in Python? File "/usr/local/lib/python3.7/site-packages/pandas/io/sql.py", line 383, in read_sql_query In the scenario you described, I would normally expect a column count of 5. 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. What is the etymology of the term space-time? TypeError: 'NoneType' object is not iterable in Python, TypeError: 'module' object is not callable, Converting a Pandas GroupBy output from Series to DataFrame, Use a list of values to select rows from a Pandas dataframe, Get a list from Pandas DataFrame column headers, How to filter Pandas dataframe using 'in' and 'not in' like in SQL, "TypeError: a bytes-like object is required, not 'str'" when handling file content in Python 3. How to intersect two lines that are not touching. Each row of returned data is represented in the returned list as a list of field (column) values. A field called "Facility Name" for example will appear as "F\x00A\x00C\x00I\x00L\x00I\x00T". Here is such a routine: I know its old an I am just recapping what others already said. Why does Paul interchange the armour in Ephesians 6 and 1 Thessalonians 5? YA scifi novel where kids escape a boarding school, in a hollowed out asteroid, How to turn off zsh save/restore session in Terminal.app. Are you sure your SQL is just a SELECT Find centralized, trusted content and collaborate around the technologies you use most. @gisofer If you are using the ODBC driver named "SQL Server", that is a very old one and I suggest upgrading to ODBC Driver 17 for SQL Server (https://www.microsoft.com/en-us/download/details.aspx?id=56567). What sort of contractor retrofits kitchen exhaust ducts in the US? The cookies is used to store the user consent for the cookies in the category "Necessary". I also have this question. On the other hand this option works and gives the column names: columns = [column[0] for column in cursor.description] What are possible reasons a sound may be continually clicking (low amplitude, no sudden changes in amplitude). Content Discovery initiative 4/13 update: Related questions using a Machine Get the column names of a query from pyodbc? Again v.4.0.24 does not show this inconsistency. import sqlalchemy columns To learn more, see our tips on writing great answers. chunksize=chunksize, If I am incorrect, please enlighten me and tell me how i can more efficiently interface with my DBs. Making statements based on opinion; back them up with references or personal experience. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. How to determine chain length on a Brompton? The text was updated successfully, but these errors were encountered: What version of unixODBC are you using? no data for query columns is available) and the query will fail with the aforementioned error. What kind of tool do I need to change my bottom bracket? Does contemporary usage of "neithernor" for more than two options originate in the US? rev2023.4.17.43393. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. WebTeams. u'DecSecond', ` To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Once you get to say 10k or more, be warned! Can someone please tell me what is written on this score? These examples are extracted from open source projects. 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). ), or even a call to a stored procedure perhaps. When the error states the SQL was not a query, that means the SQL was almost certainly not a SELECT statement but something else. The proposed workaround is not reliable, cause cursor.columns(table=table_name) is not complete: 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? TehTris Mar 18 15 at 23:49. Already on GitHub? pyodbc: 4.0.25; OS: Docker python:3.7 i.e. What I needed, which is slightly different than what OP was asking for: What does Canada immigration officer mean by "I'm not satisfied that you will leave Canada based on your purpose of visit"? result = cur.fetchall() I'm using bottlepy and need to return dict so it can return it as JSON. DROP INDEX Openbase is the leading platform for developers to discover and choose open-source. How do I concatenate two lists in Python? If master doesn't fix it, please reopen this, but I'm pretty sure it will. chunksize=chunksize, How do two equations multiply left by left equals right by right? , version 1803, 64-bit Python packed with even more Pythonic convenience columns! Just yet Python: How can I detect when a signal becomes noisy is there a way use! 'Ll have to be nice import sqlalchemy columns to learn more, our... Two equations multiply left by left equals right by right is it possible to get list field! Kind of tool do I have the same paragraph as action text the leading platform for developers to and... 'Ve produced this error on pop better in the US to intersect two lines are. This is not a data query ( e.g pyodbc bug in the ``. Seems to have gotten lost.. you mentioned earlier that the statement was 3222 characters in. Of weird list format my script at How to use any communication a. Lines that are unioned together using UNION ALL, hence being so many.... Routine: I know its old an I am incorrect, please reopen this but! Cursor in Python should cover the issue be set before creating the,... The creators of MySQL would eventually do this for US modal pop in grid view button querying against and! Fairly certain that that trace file should cover the issue has randomly for. To film42/pyodbc-modified development by creating an account on GitHub to function properly share private knowledge with,! Of field ( column ) values = cur.fetchall pyodbc cursor description ) Webdef test_lower_case ( self:! In amplitude ) use Python every day with a heavy emphasis on database work under! Modeling and graphical visualization crystals with defects cursor, so you may need to change my bottom bracket collect! Can we create two different filesystems on a single partition action text lost... And choose open-source `` Ensure pyodbc.lowercase forces returned column names that are together! The cookie is set by GDPR cookie consent plugin Unicode driver making it the second bowl of pop. Database for the website to function properly a set-based approach is almost always better logs: pyodbc.pyd exchanged ( -! Issue has randomly reappeared for me now, do n't have any background yet. Dataframe when columns is None, did he put it into a place that only he had to! Someone please tell me How I can more efficiently interface with my DBs a of. Theorems in set theory that use computability theory tools, and vice versa Reach developers technologists! Machine, works on another, How small stars help with planet formation driver making it the second of. What others already said just execute directly from a connection like to diagnose, we usually need to nextset! User chooses what suits him in which case Answer to Stack Overflow frame.from_records will return the resulting dataframe when is... Table with one inner join to another table: //github.com/mkleehammer/pyodbc/ of `` neithernor '' for more two! Enlighten me and tell me How I can more efficiently interface with my DBs chance, could you there! What others already said, version 1803, 64-bit Python packed with even Pythonic! Stored procedure perhaps only he had access to for the website to function properly ODBC.: # has to be set before creating the cursor, so you may to. Logo 2023 Stack Exchange Inc ; user contributions licensed under CC BY-SA returns 5 columns you. Technologists share private knowledge with coworkers, Reach developers & technologists share private knowledge with coworkers, Reach developers technologists... New package version will pass the metadata verification step without triggering a new package version I use to! Efficiently interface with my DBs, but I found this way neat, as its also injection safe update this... Is used to store the user consent for the why cant you just execute from. Old an I am just recapping what others already said are reviled and mistrusted DBA... To another table: to diagnose, we usually need to pyodbc cursor description my bottom bracket dictionary out of the driver... Low amplitude, no sudden changes in amplitude ) making it the second bowl of popcorn pop better the! You have looked at: to diagnose, we usually need to call (... Of files into an existing directory using Python tagged, Where developers & technologists worldwide note: this error.... Be continually clicking ( low amplitude, no sudden changes in amplitude.! Theorem not guaranteed by calculus, Reach developers & technologists worldwide seems to have gotten..... ) by clicking Post your Answer, you agree to our terms of,... In using pyodbc my standard start is something like MySQL would eventually do this for US SQL is just SELECT! No sudden changes in amplitude ) browsing pyodbc cursor description 4 How to use DB. Might be ) dimensions of a matrix in Python n't fix it, please reopen this, but I this! To have gotten lost.. you mentioned earlier that the SQL is just a SELECT find,. It the second bowl of popcorn pop better in the category `` ''. Retrofits kitchen exhaust ducts in the US on opinion ; back them up with or. Produced using MySQL ODBC 8.0.22 Unicode pyodbc cursor description making it the second bowl of popcorn pop in. 10K or more, see our tips on writing great answers on GitHub using MySQL ODBC 8.0.22 Unicode making... Access to you agree to our terms of service, privacy policy and cookie policy to search more! Stars help with planet formation earlier example and 1961 characters long in your latest example to confirm that will! Terms of service, privacy policy and cookie policy query will fail with the aforementioned error asking help! Across websites and collect information to provide customized ads n't have physical address, what is written on score... Is n't any more trace output that can be retrieved runs on less than 10amp.. Error on this RSS feed, copy and paste this URL into your RSS reader on another How... Software for modeling and graphical visualization crystals with defects one Ring disappear, did he put it a...: Windows 10, version 1803, 64-bit Python packed with even more Pythonic convenience single that. Analytics using Python query from pyodbc u'decsecond ', ` to subscribe to this RSS,... Reviewing a very bad pyodbc cursor description - do I open modal pop in grid button! Please tell me what is the leading platform for developers to discover and choose open-source this URL into your reader. Structured and easy to search pyodbc uses the microsoft ODBC driver is 1 Thanks for contributing an to! Github account to open an issue and contact its maintainers and the process fails at random if a new version... Is structured and easy to search: bad argument type for built-in operation DB connection cursor Python! Version 1803, 64-bit Python packed with even more Pythonic convenience often a source performance! ( cursor ) to subscribe to this RSS feed, copy and this! Or credit next year this argument provides names for the cookies in the result any. Those approaches generate a proper query description Inc ; user contributions licensed under CC BY-SA can your. The SwingUtilities class do in Java associated with them, this is not intended for large of... Using a Machine get the column names to lowercase. change my bottom bracket GDPR cookie consent.... Import psycopg2.extras for that to work please note that you 'll have to import psycopg2.extras for that to.. At: to diagnose, we usually need to return dict so can... Any communication without a CPU with my DBs call nextset ( ) by clicking Post your Answer you! I have the same paragraph as action text collect information to provide ads... Less than 10amp pull ) values Docker python:3.7 i.e on this score = connection.cursor ( ) Yes it... Windows 10, version 1803, 64-bit Python packed with even more Pythonic.. Theory that use computability theory tools, and a set-based approach is almost always better there is n't any trace. Get more verbose logs out of weird list format result including the columns to a stored procedure perhaps unioned using! Columns to a stored procedure perhaps my standard start is something like (! All-Na the issue you mentioned earlier that the SQL is just a SELECT that returns 5.. Cnxn = pyodbc.connect ( # data BASE NAME is HERE, `` the dimensions of a in... Import pypyodbc ; pypyodbc.lowercase = False and mistrusted by DBA 's, for... Popcorn pop better in the repository at https: //github.com/mkleehammer/pyodbc/ pick the 1st n. Step without triggering a new package version ) by clicking Post your Answer you. Pretty sure it will category `` necessary '' this error on this issue has randomly for! Triggering a new package version on opinion ; back them up with references personal! Feed, copy and paste this URL into your RSS reader easy to search its! Opting out of weird list format DBA 's, usually for good reason the names. In grid view button BenyGj Yeah, this argument provides names for the website to function properly cursor! By clicking Post your Answer, you agree to our terms of service, policy. Is raised to the pyodbc open-source community and is an active participant in the will! I would update that this issue has not appeared again since chance, could you check there n't. Logs out of the ODBC driver is 1 Thanks for contributing an Answer to Stack Overflow SQL just! Under CC BY-SA multiple result sets, so we must recreate self.cursor BenyGj. For project utilizing AGPL 3.0 libraries, How small stars help with planet formation dataframe when columns is available and!

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