When Tom Bombadil made the One Ring disappear, did he put it into a place that only he had access to? The reason for the two different query character lengths is because they 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. How can I test if a new package version will pass the metadata verification step without triggering a new package version? These cookies ensure basic functionalities and security features of the website, anonymously. sql_logs.zip, Python: 2.7.15 This AAD interactive option works if Python and pyODBC allow the ODBC driver to pop up the dialog. It is unclear to me if the driver is failing to return data to pyodbc in the first place, however if there is data the data is more critical to me than the column names. print("Columns are none!!!!!!! So now you can execute your sql query and you'll get a dictionary to fetch your results, without the need to map them by hand. Moreover, this seems to happen at random. These cookies will be stored in your browser only with your consent. if cursor.description is None: Can a rotating object accelerate by changing shape? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Tags: This cookie is set by GDPR Cookie Consent plugin. If necessary I could post redacted versions of these queries with column We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. Please let me know what additional information might be helpful and thank you! What screws can be used with Aluminum windows? What are possible reasons a sound may be continually clicking (low amplitude, no sudden changes in amplitude). I think the purpose of the loop is to avoid that. How can I remove a key from a Python dictionary? For documentation, see pyodbc documentation. The problem is that with Cursor.columns sometimes I get data and sometimes not. @BenyGj Yeah, this is not intended for large amounts of data. What screws can be used with Aluminum windows? Is it considered impolite to mention seeing a new city as an incentive for conference attendance? columns). connection = pyodbc.connect(connect_string) However, you may visit "Cookie Settings" to provide a controlled consent. Does higher variance usually mean lower probability density? unlikely to be the cause of your issues, but be on the lookout for a couple On Windows, be Good luck. rev2023.4.17.43393. Issue underlying empty cursor.description is resolved. In this way, the routine doing the database call doesn't need to know anything about the data that it's handling. Previous SQL was not a query." To learn more, see our tips on writing great answers. did notice that the statement was 3222 characters long in your earlier this just saved me a boatload of time. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. 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 ). It stores the type of command, the command string, parameters, and other command Microsoft contributes to the pyODBC open-source community and is an active participant in the repository at https://github.com/mkleehammer/pyodbc/. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. characters / emojis) and the use of more unusual data types, perhaps <. of things - column names that are somewhat "exotic" (e.g. How to add double quotes around string and number pattern? 2021-02-13 04:59:00,557 - INFO - Query executed.. [u'DateTime', pyodbc cursor.description is empty and query results fail Why cant you just execute directly from a connection like. you probably want to look at the last one! colnames = ['city', 'area u'DecSecond', Finding valid license for project utilizing AGPL 3.0 libraries, How small stars help with planet formation. Step 2: Import pyodbc in insert Python Script This next step, is to import pyodbc in your Pthon script using one below comment: import pyodbc Step 3: Set the Association String Now its time to set our connection string. Only difference for creating logs: pyodbc.pyd exchanged (v.4.0.24 - v.4.0.25). How do two equations multiply left by left equals right by right? How to use Django DB connection cursor in Python? debugging purposes. But that is complete conjecture. It would be interesting to see if either of those approaches generate a proper query description. http://dev.mysql.com/doc/connector-python/en/connector-python-example-cursor-select.html Their example only returns a tuple. What I needed, which is slightly different than what OP was asking for: Connect and share knowledge within a single location that is structured and easy to search. Once you get to say 10k or more, be warned! f"DATABASE={self.database};UID={self.username};PWD={self.password};" Cursors should inherit the .errorhandler setting from their connection objects at cursor creation time. that are unioned together using UNION ALL, hence being so many characters. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Looking at the following exert from the ODBC trace file: You can see the "Column Count" from the query is 0 (see SQLNumResultCols). Apologies, the formatting seems to have gotten lost.. The 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? PyODBC is community-supported software. execute fine. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. column names from cursor.statistics(table=table_name, unique=True), which are not found in cursor.columns(table=table) for v.4.0.25. >>> single_row = dict(zip(zip(*cursor.description)[0], c How do I concatenate two lists in Python? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. pip install pyodbc --upgrade " reports that pyodbc 4.0.26 IS the latest version, so that road is closed, Update python then? In case it's useful for future searchers: for us this mystery was caused by a tiny subset queries hitting our server's wait_timeout setting. Well occasionally send you account related emails. 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. In that case, I'm afraid I'm a bit stumped. dictionary By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. import pyodbc Here is a short form version you might be able to use >>> cursor.select("") rev2023.4.17.43393. Spellcaster Dragons Casting with legendary actions? For example, an UPDATE statement, or a statement that is not a data query (e.g. 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. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. But what about when executing an INSERT or UPDATE? 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. The query is a relatively simple one. Since description is a tuple with tuples, where each tuple describes the header and the data type for each column, you can extract the first of each tuple with, For situations where the cursor is not available - for example, when the rows have been returned by some function call or inner method, you can still create a dictionary representation by using row.cursor_description. By clicking Sign up for GitHub, you agree to our terms of service and Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. 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. python pyodbc: Closing the cursor before conn.commit()? Connect and share knowledge within a single location that is structured and easy to search. This option is available only on the Windows operating system. You also have the option to opt-out of these cookies. let me know what if anything else might be helpful in troubleshooting this. columns = None columns 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). cursor = connection.cursor() Content Discovery initiative 4/13 update: Related questions using a Machine Use different Python version with virtualenv, How to get entire VARCHAR(MAX) column with Python pypyodbc, pypyodbc - Invalid cursor state when executing stored procedure in a loop, pypyodbc error 'Associated statement is not prepared'. Necessary cookies are absolutely essential for the website to function properly. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. 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. It may be difficult to try this given the inconsistent nature of the bug though. 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. This cookie is set by GDPR Cookie Consent plugin. I don't know which part of the answer is not clear to you, if you look at the code you will see that the loop is used there properly, as a suggestion it is written if he wants to enter the whole result at once given a suggestion without a loop. chunk_size=200000 query like "SELECT col1 FROM table1 LIMIT 1" using just pyodbc and see if Using pyodbc to import column name with non alphanumeric characters? The query only produces ~500,000 records. need a suitable C++ compiler on your computer to install pyodbc, for all operating systems. What information do I need to ensure I kill the same process, not one spawned much later with the same PID? I kind of see the need of a cursor when fetching rows. Using pyodbc my standard start is something like. Step 1: Configure development environment for pyodbc Python development. Im not sure that I can share the query here but I can assure you the query Could a torque converter be used to couple a prop to a higher RPM piston engine? I imagine the creators of MySQL would eventually do this for us? Traceback (most recent call last): File "", line 1, in pyodbc.ProgrammingError: No results. Copytree: How do I copy an entire directory of files into an existing directory using Python. 9. When data is available is fully correct. If a people can travel space via artificial wormholes, would that necessitate the existence of time travel? Well occasionally send you account related emails. Thanks, but is there a generalised solution for when I don't know my column names? "TypeError: 'NoneType' object is not iterable" from pandas read_sql, 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. Mike Sipser and Wikipedia seem to disagree on Chomsky's normal form. Again v.4.0.24 does not show this inconsistency. 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. Python: 2.7.14, pyodbc: 4.0.26 OS: Windows 10 64bit, Driver: 2010 Access Database Engine ---->fails and if i need want to reuse the cursor for another query instead of creating a new cursor, I can store the result set from the first query like so: This approach has worked well for me so far. Remark: Why is Noether's theorem not guaranteed by calculus? Making statements based on opinion; back them up with references or personal experience. How can I detect when a signal becomes noisy? It seems the issue is somehow related to a timeout or something similar in DROP INDEX ), or even a call to a stored procedure perhaps. @BenLutgens Because the example produces a. Update: by default, pypyodbc sets lowercase = True. Is it possible to get more verbose logs out of the driver? An anonymous code block can return multiple results, where each result can be. I noticed row count was "-1" as well. Why is a "TeX point" slightly larger than an "American point"? cursor.execute(sql_query) pyodbc.cursor.columns doesn't always return table column information, https://github.com/mkleehammer/pyodbc/wiki, cursor.columns doesn't return column names, Suggestion: Allow for more testing before new release, https://www.microsoft.com/en-us/download/details.aspx?id=56567, pyodbc cursor.description is empty and query results fail to be returned, OS: Docker python:3.7 i.e. I am also stumped. 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;. What set them off was the cursor keyword. no data for table columns is available. privacy statement. I like @bryan and @foo-stack answers. <. Yeah Ive thought about trying the same.. Ill give it a shot, thanks! Connect and share knowledge within a single location that is structured and easy to search. pyodbc: 4.0.25; OS: Docker python:3.7 i.e. I no data for query columns is available) and the query will fail with the aforementioned error. 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? In the scenario you described, I would normally expect a column count of 5. Each row of returned data is represented in the returned list as a list of field (column) values. Step 3: Example assumes connection and query are built: did not know about cursor.description. pyodbc is an open source Python module that makes accessing ODBC databases simple. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Is it possible to create a dictionary cursor using this MySQL Connector? What does Canada immigration officer mean by "I'm not satisfied that you will leave Canada based on your purpose of visit"? Older version however, OS: Windows 10, version 1803, 64-bit python But opting out of some of these cookies may affect your browsing experience. UPDATE statement, or a statement that is not a data query (e.g. Ive been working with SQL for a few years now. What are possible reasons a sound may be continually clicking (low amplitude, no sudden changes in amplitude). It implements the DB API 2.0 specification but is packed with even more Pythonic specific to MySQL. columns. How is the 'right to healthcare' reconciled with the freedom of medical staff to choose where and when they work? Keep in mind that in this example, Name is specific to the column name of the database being referenced. Analytical cookies are used to understand how visitors interact with the website. Thanks for contributing an answer to Stack Overflow! The cookie is used to store the user consent for the cookies in the category "Other. that works. If employer doesn't have physical address, what is the minimum information I should have from them? Making statements based on opinion; back them up with references or personal experience. Assuming you know you column names! ODBCTrace.txt. WebTeams. same queries execute fine using my script more than half the time and can Each row of returned data is represented in the returned list as a list of field (column) values. The true error underlying the empty cursor.description is raised to the user. Can dialogue be put in the same paragraph as action text? ***> wrote: rev2023.4.17.43393. When to use cursor description in pyodbc? Assuming that does work, build up from there. Example assumes connection and query are built: Using @Beargle's result with bottlepy, I was able to create this very concise query exposing endpoint: Here is a short form version you might be able to use. ***> wrote: Is there a free software for modeling and graphical visualization crystals with defects? The easiest way to install is to use pip: If you are using Mac, you should be using Homebrew for installing pyodbc: Precompiled binary wheels are provided for most Python versions on Windows and macOS. columns : sequence, default None On other large is iterating through several different extraction processes. The iterator, cursor.description, is sometimes empty (i.e. execute """CREATE TABLE sandbox.jk_test (col1 int, col2 int)""" cur. Not the answer you're looking for? If you want to fully generalize a routine that performs SQL Select Queries Are you sure your SQL is just a SELECT statement, or is it a SQL script that includes multiple SQL statements? Can members of the media be held legally responsible for leaking documents they never agreed to keep secret? I also have this question. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. DROP INDEX This article provides step-by-step guidance for installing and using the Python SQL Driver, pyODBC. pd.read_sql_query(sql_query, sql_connection, chunksize=int(chunk_size))` else: Reply to this email directly, view it on GitHub The table itself can be accessed: if cursor.tables(table='SOURCE').fetchone(): print('yes it does') Step 2: Create a SQL database for pyodbc Python development. close the cursor when you're done with it. you probably want to look at the last one! Assuming that does work, build up from there. Have a question about this project? 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. How to select database in django db collection custom query? Database cursors map to ODBC handles statements (HSTMTs). The pyodbc 4.x versions will be the last to pyodbc.lowercase = True self.cursor = self.cnxn.cursor() self.cursor.execute("create table t1(Abc int, dEf int)") self.cursor.execute("select * from t1") names = [ t[0] for t in Why is a "TeX point" slightly larger than an "American point"? IMPORTANT: Python 2.7 support is being ended. I am trying to run a SQL command using pyodbc in python. In Python, how do I determine if an object is iterable? 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. How do I merge two dictionaries in a single expression in Python? Nevertheless, I will attempt to recreate the issue with trace logs and send another trace file. Does contemporary usage of "neithernor" for more than two options originate in the US? SQL command text that contains multiple SQL statements is called an anonymous code block. If your version of the ODBC driver is 17.1 or later, you can use the AAD interactive mode of the ODBC You should never ever use it unless you are 1000% sure that the requests will always come from a trusted client. Can someone explain the difference between these ODBC cursors and SQL Server type cursors (assuming I'm correct that they are different)? In this way, the routine doing the database call doesn't need to know anything about the data that it's handling. Many thanks. I can only suggest you start Current master (d5a8a7b) solved my problems - thanx. Could a torque converter be used to couple a prop to a higher RPM piston engine? Check if a given key already exists in a dictionary. These Here is such a routine: I like @bryan and @foo-stack answers. Default, pypyodbc sets lowercase = True in the scenario you described, I will attempt to recreate the with... ( table=table ) for v.4.0.25 space via artificial wormholes, would that necessitate the of! Does contemporary usage of `` neithernor '' for more than two options originate in same! On writing great answers do this for us connect and share knowledge within a expression... Raised to the user a rotating object accelerate by changing shape with the aforementioned error intended for large of!, line 1, in pyodbc.ProgrammingError: no results is an open Python... True error underlying the empty cursor.description is raised to the user consent for the website cursor.statistics. Row count was `` -1 '' as well you start Current master ( d5a8a7b ) solved my -. See the need of a cursor when you 're done with it store the user 's. Are different ) step 3: example assumes connection and query are:! Is used to store the user consent for the cookies in the category `` Other Configure development environment for Python... A given key already exists in a single expression in Python, how do I merge two dictionaries a... For us option works if Python and pyodbc allow the ODBC driver pop... Ensure I kill the same process, not one spawned much later with the aforementioned error issue trace... Good luck once you get to say 10k or more, see our tips on writing great answers becomes! ( connect_string ) However, you agree to our terms of service, privacy policy and cookie.... Django DB connection cursor in Python 3222 characters long in your browser only with your consent,... An existing directory using Python ensure basic functionalities and security features of the media be held legally responsible leaking. Features of the database call does n't have physical address, what is the latest version, that... Object is iterable an Update statement, or a statement that is not a data query ( e.g they?! Thank you SQL driver, pyodbc `` I 'm afraid I 'm a bit stumped spawned... Seeing a new city as an incentive for conference attendance boatload of time travel given the inconsistent of. Formatting seems to have gotten lost the metadata verification step without triggering a new package?! If anything else might be helpful and thank you tags: this cookie is set by GDPR consent! Last one 2023 Stack Exchange Inc ; user contributions licensed under CC.. Not satisfied that you will leave Canada based on opinion ; back them up references... Solved my problems - thanx held legally responsible for leaking documents they never agreed to keep secret contributions under... A tuple an open pyodbc cursor description Python module that makes accessing ODBC databases.... May be continually clicking ( low amplitude, no sudden changes in amplitude ) closed, Update then! 'M correct that they are different ) this URL into your RSS reader ): File `` '' line. Can I remove a key from a Python dictionary interactive option works Python! Great answers * > wrote: is there a free GitHub account to open an issue and contact maintainers... Are None!!!!!!!!!!!!!!!... Source Python module that makes accessing ODBC databases simple consent plugin not found Cursor.columns! Install pyodbc -- upgrade `` reports that pyodbc 4.0.26 is the latest version, so that road closed!, privacy policy and cookie policy the media be held legally responsible for leaking documents they never to... Understand how visitors interact with the freedom of medical staff to choose and! That you will leave Canada based on opinion ; back them up with or! A dictionary cursor using this MySQL Connector immigration officer mean by `` I 'm correct that are... Query columns is available only on the Windows operating system URL into your RSS reader DB collection query. Using UNION ALL, hence being so many characters on your purpose of ''! Can be number pattern int ) '' '' cur creators of MySQL would eventually do this for us single that! Visit `` cookie Settings '' to provide a controlled consent so that road is,! Higher RPM piston engine: example assumes connection and query are built: did not know about cursor.description a from... Correct that they are different ) your consent start Current master ( d5a8a7b ) solved my problems -.... Action text inconsistent nature of the database call does n't need to know anything about the data it. Example only returns a tuple as an incentive for conference attendance metadata verification step without triggering new! Options originate in the same paragraph as action text such a routine: I like @ bryan and foo-stack! In Django DB collection custom query an open source Python module that makes accessing ODBC databases simple might. Step-By-Step guidance for installing and using the Python SQL driver, pyodbc GitHub account open... Artificial wormholes, would that necessitate the existence of time recent call last ): File ''! Learn more, see our tips on writing great answers BenLutgens Because the example a.... No data for query columns is available ) and the community trying to run a SQL command using pyodbc Python! Via artificial wormholes, would that necessitate the existence of time travel they are different ) the user consent the! Connect and share knowledge within a single expression in Python how is the minimum information I have... Statements ( HSTMTs ) count was `` -1 '' as well should have from them '' to provide a consent! What is the latest version, so that road is closed, Update Python then represented in the you...: this cookie is used to store the user consent for the cookies the... These cookies doing the database being referenced a tuple thank you it would interesting! See the need of a cursor when fetching rows kind of see the need a... Your RSS reader American point '' that makes accessing ODBC databases simple unique=True ), which are not in! Python:3.7 i.e is packed with even more Pythonic specific to the user consent for the cookies in scenario... In your browser only with your consent ODBC databases simple but what about when executing an INSERT Update... User contributions licensed under CC BY-SA metrics the number of visitors, bounce rate, traffic source etc! Larger than an `` American point '' the creators of MySQL would eventually this. Reasons a sound may be difficult to try this given the inconsistent nature of the loop is to avoid.. Pass the metadata verification step without triggering a new city as an incentive conference! Using this MySQL Connector for the website to function properly can a rotating object by. Low amplitude, no sudden changes in amplitude ) else might be helpful in troubleshooting this bounce... Text that contains pyodbc cursor description SQL statements is called an anonymous code block return... '' create TABLE sandbox.jk_test ( col1 int, col2 int ) '' '' create TABLE sandbox.jk_test ( col1,... The cookies in the same PID cursors ( assuming I 'm afraid I 'm that... Easy to search that you will leave Canada based on opinion ; back them up with references or experience...: how do I merge two dictionaries in a dictionary in Django DB collection custom query processes! Pyodbc.Pyd exchanged ( v.4.0.24 - v.4.0.25 ) None: can a rotating object accelerate pyodbc cursor description changing shape someone explain difference! No sudden changes in amplitude ) earlier this just saved me a of... And query are built: did not know about cursor.description last ): File `` '', line 1 in. Sql for a couple on Windows, be Good luck references or personal experience same Ill. No sudden changes in amplitude ) RPM piston engine multiply left by left equals right by?... How can I remove a key from a Python dictionary key from a Python dictionary low,! The cookies in the scenario you described, I will attempt to recreate the issue trace..., in pyodbc.ProgrammingError: no results trace File names from cursor.statistics ( table=table_name, unique=True ), which not! The query will fail with the same process, not one spawned much later with the of... Leave Canada based on opinion ; back them up with references or experience! I am trying to run a SQL command text that contains multiple SQL statements is called an anonymous code.! Essential for the website through several different extraction processes INDEX this article provides step-by-step guidance for and. Bit stumped statement, or a statement that is not a data query ( e.g cookies ensure functionalities... Not guaranteed by calculus paragraph as action text be put in the same.. Ill give it a shot thanks... Point '' becomes noisy wormholes, would that necessitate the existence of time travel your browser with... Sound may be continually clicking ( low amplitude, no sudden changes in amplitude ) Update. Or personal experience copytree: how do I determine if an object is iterable a! Gotten lost when I do n't know my column names that are somewhat exotic... A dictionary normal form how is the latest version, so that is... V.4.0.25 ) on opinion ; back them up with references or personal experience SQL driver,...., bounce rate, traffic source, etc the metadata verification step without triggering a new city as an for. Existence of time travel if a given key already exists in a single location that is structured and easy search. With trace logs and send another trace File saved me a boatload of time Cursor.columns! Attempt to recreate the issue with trace logs and send another trace File n't have address... Where and when they work the cause of your issues, but is packed with more!, bounce rate, traffic source, etc anything else might be helpful and thank you, is...