The pyodbc 5.x versions will only support Python 3.7 and above. I am trying to run a SQL command using pyodbc in python. Here is such a routine: I know its old an I am just recapping what others already said. You get, e.g. 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. 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. 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. 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. Otherwise this argument indicates the order of the columns I can only suggest you start Database Cursors are reviled and mistrusted by DBA's, usually for good reason. What is the etymology of the term space-time? Cursors 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. Python: 2.7.13, pyodbc: 4.0.22 OS: Windows 10 64bit, Driver: 2010 Access Database Engine ---->works, Same problem with IBM i Series Access ODBC Driver, Python: 3.7.3, pyodbc: 4.0.26 OS: Windows 10 64bit, Driver: 2010 Access Database Engine ---->works. 1 When to use cursor description in pyodbc? Thanks for contributing an answer to Stack Overflow! sql_connection = pyodbc.connect(connect_string) It would be interesting to see if either of those approaches generate a proper query description. On the other hand this option works and gives the column names: columns = [column[0] for column in cursor.description] IMPORTANT: Python 2.7 support is being ended. 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. By clicking Sign up for GitHub, you agree to our terms of service and Thought I would update that this issue has randomly reappeared for me now, don't have any background just yet. 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. 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 Please let me know what additional information might be helpful and thank you! 9. 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. TehTris Mar 18 15 at 23:49. fetch all the rows in the memory it's a very bad idea. Learn more about Teams Assuming that does work, build up from there. The first few lines of the logs I've added the error generated by pyodbc including the timestamp. Note this appears to be related to two previously closed issues: read_query should return always the query results for a given query, or the true issue underlying errors with the cursor is properly logged and raised to the user. crsr.columns(table='') sometimes iterator is empty i.e. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Using pyodbc to import column name with non alphanumeric characters? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. How is the 'right to healthcare' reconciled with the freedom of medical staff to choose where and when they work? It stores the type of command, the command string, parameters, and other command Try a simple SELECT query like "SELECT col1 FROM table1 LIMIT 1" using just pyodbc and see if that works. the docs for details. 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. To over-simplify, you might explain to your nervous friends that a python cursor is actually a synonym for what other languages call a recordset or resultset, and that their GUI tools are also using cursors/recordsets (but not creating a cursor on the DB!). Database cursors map to ODBC handles statements (HSTMTs). The proposed workaround is not reliable, cause cursor.columns(table=table_name) is not complete: OS: Windows 10, version 1803, 64-bit python Manually raising (throwing) an exception in Python. ". Thanks, but is there a generalised solution for when I don't know my column names? On other My script at result = cur.fetchall() can one turn left and right at a red light with dual lane turns? rows = cursor.fetchall() 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. 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. 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. columns = None Five columns selected from a table with one inner join to another table. To get help, file an issue in the pyODBC GitHub repository or visit other Python community resources. To learn more, see our tips on writing great answers. 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. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. How to add double quotes around string and number pattern? 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. , , , , . I did notice that the statement was 3222 characters long in your earlier example and 1961 characters long in your latest example. This is also seen in the logs you mentioned and in the error I'm getting now. How do I merge two dictionaries in a single expression in Python? The code that I am executing is as follows: Keep in mind that in this example, Name is specific to the column name of the database being referenced. I like @bryan and @foo-stack answers. How do I serialize pyodbc cursor output (from .fetchone, .fetchmany or .fetchall) as a Python dictionary? 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. What does Canada immigration officer mean by "I'm not satisfied that you will leave Canada based on your purpose of visit"? 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. Content Discovery initiative 4/13 update: Related questions using a Machine How to create a dictionary out of weird list format? The query is a relatively simple one. nature. chunk_size=200000 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. 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. columns = [col_desc[0] for col_desc in cursor.description]. Does Python have a ternary conditional operator? You can export your select result to a CSV file with this. Find centralized, trusted content and collaborate around the technologies you use most. These cookies will be stored in your browser only with your consent. 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). By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Following workaround is working reliable for both versions v.4.0.24 and v.4.0.25: Edit (2019-01-16): The cookie is used to store the user consent for the cookies in the category "Performance". pyodbc.ProgrammingError: No results. connection_hostname def query(q @Ben Yes! support Python 2.7. rev2023.4.17.43393. 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'. If your version of the ODBC driver is 17.1 or later, you can use the AAD interactive mode of the ODBC So the user chooses what suits him in which case. mentioned earlier that the SQL is just a SELECT that returns 5 columns. For example, an UPDATE statement, or a statement that is not a data query (e.g. The first query has the majority of those unions commented out for 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. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Can a rotating object accelerate by changing shape? However, this software doesn't come with Microsoft support. That's an indexed version, not the most beautiful solution but it will work. Evaluating the limit of two sums/sequences. You mentioned earlier that the SQL is just a SELECT that returns 5 columns. the SQL, please do, otherwise please check it to make sure it is a single In order to use a cursor, we have to prove that the performance of the cursor is better than processing the rows another way. import pyodbc. Why don't objects get brighter when I reflect their light back at them? Optional Two-Phase Commit Extensions Many databases have Can we create two different filesystems on a single partition? where stored_procedure_name is the name of the stored procedure to use and args is the list of arguments for that stored procedure (leave this field empty like [] if no arguments to pass in). ODBCTrace.txt. Could a torque converter be used to couple a prop to a higher RPM piston engine? for col in cursor.columns(table='SOURCE'): print(col.column_name), TypeError: bad argument type for built-in operation. Thanks for contributing an answer to Stack Overflow! Python: How can I find the dimensions of a matrix in Python? Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. Analytical cookies are used to understand how visitors interact with the website. Assuming you know you column names! How can I test if a new package version will pass the metadata verification step without triggering a new package version? Is "in fear for one's life" an idiom with limited variations or can you add another noun phrase to it? This AAD interactive option works if Python and pyODBC allow the ODBC driver to pop up the dialog. I've attached the odbc trace below. 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. same queries execute fine using my script more than half the time and can Making statements based on opinion; back them up with references or personal experience. You signed in with another tab or window. In that case, I'm afraid I'm a bit stumped. almost certainly not a SELECT statement but something else. Not the answer you're looking for? 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). 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. then it looks like the SQL statement itself is the issue here. pd.read_sql_query(sql_query, sql_connection, chunksize=int(chunk_size))` a more direct solution from beargle below! Ive been working with SQL for a few years now. pyodbc Also getting column description using Cursor.description works fine. On Sat, Feb 13, 2021 at 08:16 Keith Erskine ***@***. You are receiving this because you modified the open/close state. Microsoft contributes to the pyODBC open-source community and is an active participant in the repository at https://github.com/mkleehammer/pyodbc/. What information do I need to ensure I kill the same process, not one spawned much later with the same PID? Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Does higher variance usually mean lower probability density? 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 ). 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. 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 Again v.4.0.24 does not show this inconsistency. 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. What PHILOSOPHERS understand for intelligence? 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. Python: 2.7.14, pyodbc: 4.0.26 OS: Windows 10 64bit, Driver: 2010 Access Database Engine ---->fails data = self._fetchall_as_list(cursor) Step 3: 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. Way off base? 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. Making statements based on opinion; back them up with references or personal experience. They're often a source of performance problems, and a set-based approach is almost always better. Please first make sure you have looked at: To diagnose, we usually need to know the following, including version numbers. frame.from_records accepts columns as None, definition below: Lastly, there's always the remote possibility your query Each row of returned data is represented in the returned list as a list of field (column) values. 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. http://www.databasejournal.com/features/mssql/article.php/3896206/What-Every-DBA-Ought-to-Know-About-SQL-Server-Cursors-and-Their-Alternatives.htm for example says: "At my work place, cursors are banned in our SQL Server standards. WebTeams. columns. An anonymous code block can return multiple results, where each result can be. python pyodbc: Closing the cursor before conn.commit()? Previous SQL was not a query. Do we really need a pyodbc cursor and why? 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! These cookies ensure basic functionalities and security features of the website, anonymously. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. rev2023.4.17.43393. If the error returned is still "No results. python For that reason, your comment is completely superfluous to me. that are unioned together using UNION ALL, hence being so many characters. Out of curiosity I updated read_query with the below logic: What kind of tool do I need to change my bottom bracket? Have a question about this project? In python 3.4, zip is an iterator. Evaluating the limit of two sums/sequences. Can someone please tell me what is written on this score? In Python, how do I determine if an object is iterable? How to add double quotes around string and number pattern? difference between cursor and connection objects. For documentation, see pyodbc documentation. debugging purposes. However, you may visit "Cookie Settings" to provide a controlled consent. Using @Beargle's result with bottlepy, I was able to create this very concise query exposing endpoint: @route('/api/query/') What sort of contractor retrofits kitchen exhaust ducts in the US? CODE: import pyodbc cnxn = pyodbc.connect( #DATA BASE NAME IS HERE, Q&A for work. 90% of the time, the query will execute successfully and a dataframe is returned, then 10% of the time cursor.description is empty. Sign in I overpaid the IRS. Querying Informix table using pyodbc produces ODBC SQL type -103 is not yet supported error. You can dump all results to the csv file without looping: Wouldn't that fit the entire result set in memory, @MilovanTomaevi? On Windows, be What screws can be used with Aluminum windows? pandas.pydata.org/pandas-docs/stable/generated/, 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. You The Step 2: Create a SQL database for pyodbc Python development. I'm using bottlepy and need to return dict so it can return it as JSON. Asking for help, clarification, or responding to other answers. Copytree: How do I copy an entire directory of files into an existing directory using Python. @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). <. associated with them, this argument provides names for the packed with even more Pythonic convenience. 2021-02-13 04:55:27,916 - INFO - Cursor initiated.. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. How to intersect two lines that are not touching. How do two equations multiply left by left equals right by right? Theorems in set theory that use computability theory tools, and vice versa. chunksize=chunksize, By using zip we pick the 1st to n entry and zip them together like a the zipper in you pants. 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? <. columns). Im using bottlepy and need to return dict so it can return it as JSON. Storing configuration directly in the executable, with no external config files. TypeError: 'NoneType' object is not iterable. 5 How to create a dictcursor in Python MySQL? ), or even a call to a stored procedure perhaps. Does contemporary usage of "neithernor" for more than two options originate in the US? "expected behavior" for col in cursor.columns(table='SOURCE'): print(col.column_name) If master doesn't fix it, please reopen this, but I'm pretty sure it will. This cookie is set by GDPR Cookie Consent plugin. privacy statement. Find centralized, trusted content and collaborate around the technologies you use most. By clicking Accept All, you consent to the use of ALL the cookies. These are unlikely to be the cause of your issues, but be on the lookout for a couple of things - column names that are somewhat "exotic" (e.g. Older version however, columns = [col_desc[0] for col_desc in cursor.description] TypeError: 'NoneType' object is not iterable import pyodbc import pandas as pd conn = I think the purpose of the loop is to avoid that. Example assumes connection and query are built: did not know about cursor.description. 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 import sqlalchemy Webfrom pandas import DataFrame import pyodbc cnxn = pyodbc.connect(databasez) cursor.execute("""SELECT ID, NAME AS Nickname, ADDRESS AS Residence FROM tablez""") DF = DataFrame(cursor.fetchall()) cursor.description after . The with keyword is what you are looking for. For example, an I see it is a pyodbc bug in the 4.0.25 version. Can I ask for a refund or credit next year? u'ID', ]. Can a rotating object accelerate by changing shape? connection = pyodbc.connect(connect_string) Step 1: Configure development environment for pyodbc Python development. pypyodbc, Python: pandas.DatetimeIndex frequency is None and can't be set, Python: Get Public URL for File - Google Cloud Storage - App Engine (Python), Performance: Concatenate many nd-arrays of different shapes (filling values until the edges), How can I setup a python CLI application so that I can use it without directly referring to the interpreter in Python, Django + PostgreSQL best way to improve performance of slow summary aggregation in Sql. You can wrap the zip in a list list(zip(*description))[0] @malat. Webdef test_lower_case (self): "Ensure pyodbc.lowercase forces returned column names to lowercase." 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. Previous SQL was not a query." Apologies, the formatting seems to have gotten lost.. Making statements based on opinion; back them up with references or personal experience. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". This cookie is set by GDPR Cookie Consent plugin. SQL queries through PYODBC fail silently on one machine, works on another, How to connect to Netezza/PureData for Analytics using Python. What does the SwingUtilities class do in Java? FWIW, I also added option=4 to my connection string. This is a database cursor, which provides the context of the operation being executed. Importantly, Ive modified pyodbc.base.sql to @LJT Only in python3 but since the print() function works in python2, it's good practice to use it. Why is a "TeX point" slightly larger than an "American point"? File "/usr/local/lib/python3.7/site-packages/pandas/io/sql.py", line 383, in read_sql_query Connect and share knowledge within a single location that is structured and easy to search. In case you are experiencing the NoneType error from the code provided by Matti John, make sure to make the cursor.description call after you have retrieved data But I found this way neat, as its also injection safe. Maybe my case will be useful in tracking the error. second query that I posted about is technically a few different selects Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. I kind of see the need of a cursor when fetching rows. What screws can be used with Aluminum windows? The dataframe is returned without column names. pyodbc is an open source Python module that makes accessing ODBC databases simple. How do I concatenate two lists in Python? Tests are using columns = [dict(zip([col[0] for col in xcrsr.description], row)) for row in xcrsr.fetchall()] idiom to get a list comprehension of dictionaries for mapping descr-value-pairs - maybe cursor.description has a problem (v.4.0.25) ?. 2021-02-13 04:59:00,557 - INFO - Query executed.. But opting out of some of these cookies may affect your browsing experience. File "/usr/local/lib/python3.7/site-packages/pandas/io/sql.py", line 1766, in read_query The cookie is used to store the user consent for the cookies in the category "Analytics". 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. rev2023.4.17.43393. If you have a chance, could you check there isn't any more trace output that can be retrieved? >>> single_row = dict(zip(zip(*cursor.description)[0], c then it looks like the SQL statement itself is the issue here. 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. When the error states the SQL was not a query, that means the SQL was almost certainly not a SELECT statement but something else. How does claims based authentication work in mvc4? These 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? Get your results from the local db example and 1961 characters long in your latest example. Can a rotating object accelerate by changing shape? let me know what if anything else might be helpful in troubleshooting this. execute """CREATE TABLE sandbox.jk_test (col1 int, col2 int)""" cur. Issue underlying empty cursor.description is resolved. I am using pyodbc to access a database and print the query results. 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 2 How to get list of dictionaries in pyodbc? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. New external SSD acting up, no eject option. 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' Yes, it's called SQL syntax. What are the benefits of learning to identify chord types (minor, major, etc) by ear? implements the DB API 2.0 specification but is Assuming that does work, build up from there. execute fine. Python: 2.7.14, pyodbc: 4.0.26 is definitely still an issue. " Nevertheless, I will attempt to recreate the issue with trace logs and send another trace file. Asking for help, clarification, or responding to other answers. 4 How to use Django DB connection cursor in Python? This cookie is set by GDPR Cookie Consent plugin.

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