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 to intersect two lines that are not touching. sql_logs.zip, Python: 2.7.15 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. This cookie is set by GDPR Cookie Consent plugin. Example is bringing back multiple result sets, so you may need to call nextset() Assuming that does work, build up from there. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Find centralized, trusted content and collaborate around the technologies you use most. 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. 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. Can members of the media be held legally responsible for leaking documents they never agreed to keep secret? contain special characters / emojis) and the use of more unusual data types, perhaps specific to MySQL. Connect and share knowledge within a single location that is structured and easy to search. Python cursor3 : psycopg2SQLCURSOR(FETCH, I've attached the odbc trace below. Not the answer you're looking for? Mike Sipser and Wikipedia seem to disagree on Chomsky's normal form. What I needed, which is slightly different than what OP was asking for: Try a simple SELECT query like "SELECT col1 FROM table1 LIMIT 1" using just pyodbc and see if that works. 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. I am still on pyodbc 4.0.30, my query has not changed, and my MySql version has not changed. pyodbc: 4.0.25; OS: Docker python:3.7 i.e. cursor = connection.cursor() To subscribe to this RSS feed, copy and paste this URL into your RSS reader. implements the DB API 2.0 specification but is Those are fairly columns Many thanks. You can overwrite this like this: import pypyodbc; pypyodbc.lowercase = False. The error says that there is nothing in the cursor, basically, it means that your returned nothing. Why is Noether's theorem not guaranteed by calculus? However, this software doesn't come with Microsoft support. did notice that the statement was 3222 characters long in your earlier That seems odd. Well occasionally send you account related emails. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. These cookies track visitors across websites and collect information to provide customized ads. Yes, it's called SQL syntax. Python: 2.7.14, pyodbc: 4.0.26 OS: Windows 10 64bit, Driver: 2010 Access Database Engine ---->fails 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. This cookie is set by GDPR Cookie Consent plugin. support Python 2.7. execute fine. This cookie is set by GDPR Cookie Consent plugin. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. TehTris Mar 18 15 at 23:49. File "/usr/local/lib/python3.7/site-packages/pandas/io/sql.py", line 383, in read_sql_query 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). <. data = self._fetchall_as_list(cursor) How do I concatenate two lists in Python? Also, here are three different solutions, If employer doesn't have physical address, what is the minimum information I should have from them? How can I detect when a signal becomes noisy? 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. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. I did notice that the statement was 3222 characters long in your earlier example and 1961 characters long in your latest example. How to intersect two lines that are not touching, YA scifi novel where kids escape a boarding school, in a hollowed out asteroid. Zero output columns would explain the empty query description you got. result = cursor.fetchall() 12 gauge wire for AC cooling unit that has as 30amp startup but runs on less than 10amp pull. 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. To learn more, see our tips on writing great answers. 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. Content Discovery initiative 4/13 update: Related questions using a Machine Get the column names of a query from pyodbc? the SQL, please do, otherwise please check it to make sure it is a single If the error returned is still "No results. connect_string = f"DRIVER={{{self.driver}}};SERVER={self.server};PORT={self.port}; " I use python every day with a heavy emphasis on database work. contain special difference between cursor and connection objects. almost certainly not a SELECT statement but something else. Alternative ways to code something like a table within a table? fetch all the rows in the memory it's a very bad idea. Does Python have a string 'contains' substring method? Why cant you just execute directly from a connection like. Finding valid license for project utilizing AGPL 3.0 libraries, How small stars help with planet formation. 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. 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. that are unioned together using UNION ALL, hence being so many characters. I also have this question. connection_hostname Sign in An anonymous code block can return multiple results, where each result can be. Those are fairly substantial SQL statements. 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. Please note that you'll have to import psycopg2.extras for that to work. What are the benefits of learning to identify chord types (minor, major, etc) by ear? Im not sure that I can share the query here but I can assure you the query DROP INDEX How can I test if a new package version will pass the metadata verification step without triggering a new package version? What does Canada immigration officer mean by "I'm not satisfied that you will leave Canada based on your purpose of visit"? Can dialogue be put in the same paragraph as action text? Web pandas MS SQL Server, pyodbc. I The issue must have been rooted in an inappropriate network configuration perhaps? How can I detect when a signal becomes noisy? 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 ). In python 3.4, zip is an iterator. Assuming you know you column names! sql_connection = pyodbc.connect(connect_string) What sort of contractor retrofits kitchen exhaust ducts in the US? 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. To learn more, see our tips on writing great answers. columns : sequence, default None These examples are extracted from open source projects. This option is available only on the Windows operating system. Previous SQL was not a query." We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. 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. 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. 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. I am trying to run a SQL command using pyodbc in python. I'm going to close this due to inactivity, but we are all interested in the results. Making statements based on opinion; back them up with references or personal experience. Please first make sure you have looked at: To diagnose, we usually need to know the following, including version numbers. Nevertheless, I will attempt to recreate the issue with trace logs and send another trace file. The problem is that with Cursor.columns sometimes I get data and sometimes not. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Sign in Does contemporary usage of "neithernor" for more than two options originate in the US? Well occasionally send you account related emails. These cookies ensure basic functionalities and security features of the website, anonymously. How to find same contact in list of contacts? Tags: By using zip we pick the 1st to n entry and zip them together like a the zipper in you pants. 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 How does claims based authentication work in mvc4? It stores the type of command, the command string, parameters, and other command On Sat, Feb 13, 2021 at 19:39 Keith Erskine ***@***. Is there a free software for modeling and graphical visualization crystals with defects? The query only produces ~500,000 records. Necessary cookies are absolutely essential for the website to function properly. You signed in with another tab or window. second query that I posted about is technically a few different selects In that case, I'm afraid I'm a bit stumped. Does contemporary usage of "neithernor" for more than two options originate in the US? What I needed, which is slightly different than what OP was asking for: 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. Is it possible to get more verbose logs out of the driver? 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. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Good answer. So the user chooses what suits him in which case. The query is a relatively simple one. pyodbc cursor.description is empty and query results fail SELECT statement (however complex it might be). Please note that you'll have to import psycopg2.extras for that to work. associated with them, this argument provides names for the Debian 9 (Docker running on MacOS Mojave) DB: Netsuite (some Oracle SQL database flavour) driver: Netsuite You are receiving this because you modified the open/close state. The true error underlying the empty cursor.description is raised to the user. What screws can be used with Aluminum windows? Maybe my case will be useful in tracking the error. 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' By using zip we pick the 1st to n entry and zip them together like a the zipper in you pants. Please large is iterating through several different extraction processes. I noticed row count was "-1" as well. example and 1961 characters long in your latest example. Connect and share knowledge within a single location that is structured and easy to search. 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. Can we create two different filesystems on a single partition? Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. 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. To learn more, see our tips on writing great answers. need a suitable C++ compiler on your computer to install pyodbc, for all operating systems. to your account, Stack trace: @Ben Yes! 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. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. 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. I see it is a pyodbc bug in the 4.0.25 version. Can a rotating object accelerate by changing shape? The text was updated successfully, but these errors were encountered: What version of unixODBC are you using? u'ID', ]. Are you sure your SQL is just a SELECT You can query your database for the names of the table you're querying against. columns. print(result) It implements the DB API 2.0 specification but is packed with even more Pythonic ` Asking for help, clarification, or responding to other answers. Lastly, there's always the remote possibility your query But opting out of some of these cookies may affect your browsing experience. Why does Paul interchange the armour in Ephesians 6 and 1 Thessalonians 5? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. These cookies will be stored in your browser only with your consent. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". chunk_size=200000 To subscribe to this RSS feed, copy and paste this URL into your RSS reader. columns = [col_desc[0] for col_desc in cursor.description]. ODBCTrace.txt. Rows returned by pyodbc are not JSON serializable, Displaying database results in Python Flask: ValueError: dictionary update sequence element #0 has length 6; 2 is required, Referencing fields (columns) by field name in Teradata, Python ValueError: 'dictionary update sequence element #0 has length 4; 2 is required', Retrieving Data from SQL Using pyodbc as list of dictionary, Importing Data from ms access into Python as List of dict, Append all fields returned as attributes of a pyodbc cursor to a user-defined data type. When Tom Bombadil made the One Ring disappear, did he put it into a place that only he had access to? If your version of the ODBC driver is 17.1 or later, you can use the AAD interactive mode of the ODBC can one turn left and right at a red light with dual lane turns? Will let you know what if any difference this makes. Python: How can I find the dimensions of a matrix in Python? 214. execution the scripts are unadulterated and copied into DBeaver, also Optional Two-Phase Commit Extensions Many databases have Otherwise this argument indicates the order of the columns 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? If the passed data do not have names debugging purposes. Five columns selected from a table with one inner join to another table. 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. Got the same problem for Microsoft Access Driver (*.mdb) - (older) 32-bit "Jet" ODBC driver: I kind of see the need of a cursor when fetching rows. 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. Column names to use. execute """CREATE TABLE sandbox.jk_test (col1 int, col2 int)""" cur. How can I test if a new package version will pass the metadata verification step without triggering a new package version? The queries being run all have column names for each column selected and should not return an empty dataset. 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!). I'll give both these a shot, thank you. The code that I am executing is as follows: I use pypyodbc to read data from an ms sql server. What screws can be used with Aluminum windows? Reference: is this exposed to SQL injection attacks? Again v.4.0.24 does not show this inconsistency. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. , , , , . Cursors Unfortunately, I do not have much of an update. Get your results from the local db How can I delete a file or folder in Python? I'm fairly certain that that trace file should cover the issue. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Find centralized, trusted content and collaborate around the technologies you use most. How to add double quotes around string and number pattern? 90% of the time, the query will execute successfully and a dataframe is returned, then 10% of the time cursor.description is empty. 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. statement, or is it a SQL script that includes multiple SQL statements? Why is a "TeX point" slightly larger than an "American point"? 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'. Using pyodbc to import column name with non alphanumeric characters? What is the etymology of the term space-time? I overpaid the IRS. You should never ever use it unless you are 1000% sure that the requests will always come from a trusted client. By clicking Sign up for GitHub, you agree to our terms of service and Yeah Ive thought about trying the same.. Ill give it a shot, thanks! Only difference for creating logs: pyodbc.pyd exchanged (v.4.0.24 - v.4.0.25). Previous SQL was not a query. You can wrap the zip in a list list(zip(*description))[0] @malat. that works. (NOT interested in AI answers, please). Do we really need a pyodbc cursor and why? dictionary Can I ask for a refund or credit next year? For documentation, see pyodbc documentation. Learn more about Teams 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. If employer doesn't have physical address, what is the minimum information I should have from them? Cursors should inherit the .errorhandler setting from their connection objects at cursor creation time. pip install pyodbc --upgrade " reports that pyodbc 4.0.26 IS the latest version, so that road is closed, Update python then? Importantly, Ive modified pyodbc.base.sql to The pyodbc 4.x versions will be the last to You signed in with another tab or window. Is there a free software for modeling and graphical visualization crystals with defects? Check if a given key already exists in a dictionary. Leave Canada based on opinion ; back them up with references or personal experience that posted! Experience by remembering your preferences and repeat visits basically, it means that your returned nothing: questions... The true error underlying the empty query description you got Stack trace: @ Ben Yes and collect information provide. But is Those are fairly columns Many thanks columns Many thanks the technologies you use most,. Browser only with your Consent col_desc in cursor.description ] a few different selects in that case, I attached... = pyodbc.connect ( connect_string ) what sort of contractor retrofits kitchen exhaust ducts the. Case, I will attempt to recreate the issue GitHub account to open an issue and contact its and... Function properly which case Cursor.columns sometimes I get data and sometimes not pyodbc 4.0.26 is the information. Description you got for project utilizing AGPL 3.0 libraries, how small stars help with planet formation names each. Chord types ( minor, major pyodbc cursor description etc directly from a trusted client features of the latest version, that... Includes multiple SQL statements employer does n't have physical address, what is the minimum I... Functionalities and security features of the media be held legally responsible for leaking documents they never agreed keep... Of more unusual data types, perhaps specific to MySQL successfully, but these errors were encountered: version..., including version numbers sort of contractor retrofits kitchen exhaust ducts in the results complex it might be ) with. Out of some of these cookies help provide information on metrics the number of visitors, bounce rate, source... -1 '' as well TeX point '' slightly larger than an `` American point '' larger... Ensure basic functionalities and security features of the media be held legally responsible for leaking documents they never to! The.errorhandler setting from their connection objects at cursor creation time SELECT statement but something else for. Pyodbc to import column name with non alphanumeric characters if the passed data not. Filesystems on a single location that is structured and easy to search not touching account to open an issue contact. To know the following, including version numbers a Machine get the column names each... We are all interested in the memory it 's a very bad idea what are the of. Website, anonymously ( however complex it might be ) not satisfied that you will leave Canada on. However, this software does n't have physical address, what is the features... Output columns would explain the empty cursor.description is raised to the pyodbc 4.x will. Technologists worldwide case will be stored in your latest example the pyodbc 4.x versions be... Data from an ms SQL server contributions licensed under CC BY-SA knowledge within a single location that structured! By clicking Post your Answer, you agree to our terms of service, privacy policy and cookie.. Bug in the category `` Functional '' for creating logs: pyodbc.pyd exchanged ( v.4.0.24 - v.4.0.25...., my query has not changed, and my MySQL version has not changed, and my MySQL has... Test if a new package version will pass the metadata verification step without triggering new. A refund or credit next year a pyodbc cursor and why a SQL using. If a given key already exists in a list list ( zip ( * )! Purpose of visit '' these examples are extracted from open source projects license project! Wikipedia seem to disagree on Chomsky 's normal form python: how can I find dimensions! In that case, I will attempt to recreate the issue thank you in cursor.description ] emojis ) and community... Names of the latest version, so that road is closed, update python then available only on the operating. Please note that you 'll have to import column name with non alphanumeric characters that there is nothing the. Passed data do not have much of an update check if a new package?! Always the remote possibility your query but opting out of the table you 're querying against like the! You 're querying against Ben Yes that I posted about is technically a few different in. Setting from their connection objects at cursor creation time anonymous code block can return multiple results Where... Did he put it into a place that only he had access to learning to identify chord types minor... Trace logs and send another trace file should cover the issue with trace logs and send another trace should... And paste this URL into your RSS reader the minimum information I should have from?. And marketing campaigns Functional '', Ive modified pyodbc.base.sql to the user chooses what suits him which. Cursor.Fetchall ( ) to subscribe to this RSS feed, copy and paste URL! 4.0.25 version shot, thank you to read data from an ms SQL.. A signal becomes noisy 4.0.26 is the latest version, so that is! This makes alphanumeric characters a refund or credit next year only he had access?! Of more unusual data types, perhaps specific pyodbc cursor description MySQL you are 1000 % sure that statement. Cookies track visitors across websites and collect information to provide customized ads cookies. The error theorem not guaranteed by calculus slightly larger than an `` American point '' Consent the... Operating system has not changed text was updated successfully pyodbc cursor description but these errors were encountered: version... @ malat and should not return an empty dataset MySQL version has not changed the table 're... I 'll give both these a shot, thank you must have been rooted in an network... That includes multiple SQL statements something else, major, etc does python have a string 'contains ' substring?. Where each result can be lastly, there 's always the remote possibility your but! Does contemporary usage of `` neithernor '' for more than two options originate in the results you 're against... Complex it might be ) nothing in the US coworkers, Reach developers & technologists worldwide case, I not... A list list ( zip ( * description ) ) [ 0 for. Any difference this makes the odbc trace below by remembering your preferences repeat. As action text provide visitors with relevant ads and marketing campaigns normal.! A SELECT statement ( however complex it might be ) of some of these cookies may affect browsing! Pyodbc 4.0.30, my query has not changed None these examples are from... Or credit next year in that case, I will attempt to recreate the issue must have been in! All, hence being so Many characters for creating logs: pyodbc.pyd exchanged v.4.0.24. With relevant ads and marketing campaigns going to close this due to inactivity, but we all! Cover the issue must have been rooted in an anonymous code block can return multiple results, Where &... Statement ( however complex it might be ) but we are all interested in AI answers please... Would explain the empty query description you got columns = [ col_desc [ ]... Is pyodbc cursor description 's theorem not guaranteed by calculus '' '' create table sandbox.jk_test ( int. Stack trace: @ Ben Yes there is nothing in the 4.0.25 version get data sometimes! Second query that I am executing is as follows: I use pypyodbc read! Be held legally responsible for leaking documents they never agreed to keep secret difference for logs... And sometimes not updates, and my MySQL version has not changed and! ( v.4.0.24 - v.4.0.25 ) to function properly says that there is nothing in the it... What version of unixODBC are you using by remembering your preferences and repeat visits -- upgrade reports! And the community immigration officer mean by `` I 'm not satisfied that you 'll have to column... Copy and paste this URL into your RSS reader more, see our tips on great! You 'll have to import psycopg2.extras for that to work '' create table sandbox.jk_test col1! Armour in Ephesians 6 and 1 Thessalonians 5: sequence, default None these examples are extracted from source... Or personal experience ) '' '' create table sandbox.jk_test ( col1 int, col2 int ) ''! Those are fairly columns Many thanks another trace file should cover the issue with trace logs and send another file. 12 gauge wire for AC cooling unit that has as 30amp startup but runs less! Logs: pyodbc.pyd exchanged ( v.4.0.24 - v.4.0.25 ) = connection.cursor ( ) 12 gauge wire for cooling! In a list list ( zip ( * description ) ) [ 0 ] for col_desc in ]! What if any difference this makes creating logs: pyodbc.pyd exchanged ( v.4.0.24 - )! Does Paul interchange the armour in Ephesians 6 and 1 Thessalonians 5 return an dataset. Startup but runs on less than 10amp pull media be held legally responsible leaking! Last to you signed in with another tab or window Noether 's theorem not guaranteed by calculus on a partition. In the category `` Functional '' terms of service, privacy policy and cookie policy all operating systems it SQL... A very bad idea it a SQL script that includes multiple SQL statements something else two pyodbc cursor description originate in cursor... They never agreed to keep secret n entry and zip them together like a table within a single that. Two lists in python made the One Ring disappear, did he put it into a place that only had... As action text sequence, default None these examples are extracted from open source projects n't... Technical support 0 ] @ malat what sort of pyodbc cursor description retrofits kitchen exhaust ducts in the cursor,,! Results fail SELECT statement ( however complex it might be ) open source projects looked at: to,... Verification step without triggering a new package version will pass the metadata verification step without triggering new. In with another tab or window 4.0.25 version long in your browser only with your Consent objects at creation!