Please support Python 2.7. def query(q Reply to this email directly, view it on GitHub Im using bottlepy and need to return dict so it can return it as JSON. Evaluating the limit of two sums/sequences. Have a question about this project? SELECT statement (however complex it might be). 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. 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. Asking for help, clarification, or responding to other answers. Google "Database RBAR" to educate yourself on why avoiding mis-use of cursors is important. This is obviously subjective but I do this using pandas: Thanks. mentioned earlier that the SQL is just a SELECT that returns 5 columns. The How does claims based authentication work in mvc4? How do I use pyodbc to print the whole query result including the columns to a csv file? Can someone please tell me what is written on this score? Python: 2.7.14, pyodbc: 4.0.26 is definitely still an issue. " Does contemporary usage of "neithernor" for more than two options originate in the US? Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. Evaluating the limit of two sums/sequences. 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). The error says that there is nothing in the cursor, basically, it means that your returned nothing. These cookies will be stored in your browser only with your consent. What sort of contractor retrofits kitchen exhaust ducts in the US? Making statements based on opinion; back them up with references or personal experience. debugging purposes. no data for table columns is available. 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. pyodbc: 4.0.25 A field called "Facility Name" for example will appear as "F\x00A\x00C\x00I\x00L\x00I\x00T". 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. Connect and share knowledge within a single location that is structured and easy to search. pyODBC uses the Microsoft ODBC driver for SQL Server. Those are fairly substantial SQL statements. Otherwise this argument indicates the order of the columns You can overwrite this like this: import pypyodbc; pypyodbc.lowercase = False. Try a simple SELECT Im not sure that I can share the query here but I can assure you the query Viewed 3k times. Ive been working with SQL for a few years now. Find centralized, trusted content and collaborate around the technologies you use most. The trace ends just as the SQL query is executed (the SQL that starts with "WITH NewEncounters AS"). Makes sense, that I have to use the csv module. When to use cursor description in pyodbc? An anonymous code block can return multiple results, where each result can be. 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. characters / emojis) and the use of more unusual data types, perhaps Importantly, Ive modified pyodbc.base.sql to When data is available is fully correct. Webdef test_lower_case (self): "Ensure pyodbc.lowercase forces returned column names to lowercase." Content Discovery initiative 4/13 update: Related questions using a Machine How to create a dictionary out of weird list format? Sign in The first few lines of the logs I've added the error generated by pyodbc including the timestamp. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Assuming that does work, build up from there. What are the benefits of learning to identify chord types (minor, major, etc) by ear? OS: Windows 10, version 1803, 64-bit python What does the SwingUtilities class do in Java? But opting out of some of these cookies may affect your browsing experience. 2021-02-13 04:55:27,916 - INFO - Cursor initiated.. How to find same contact in list of contacts? In order to use a cursor, we have to prove that the performance of the cursor is better than processing the rows another way. The cookies is used to store the user consent for the cookies in the category "Necessary". Can we create two different filesystems on a single partition? Asking for help, clarification, or responding to other answers. Making statements based on opinion; back them up with references or personal experience. TypeError: 'NoneType' object is not iterable. then it looks like the SQL statement itself is the issue here. 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 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? The later example tho would be useful when not fetching all data, but one row at a time, for instance: Getting tablenames (i think.. thanks to Foo Stack): The true error underlying the empty cursor.description is raised to the user. I use pypyodbc to read data from an ms sql server. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. What screws can be used with Aluminum windows? I am still on pyodbc 4.0.30, my query has not changed, and my MySql version has not changed. no data for query columns is available) and the query will fail with the aforementioned error. Python: 2.7.14, pyodbc: 4.0.26 OS: Windows 10 64bit, Driver: 2010 Access Database Engine ---->fails How is the 'right to healthcare' reconciled with the freedom of medical staff to choose where and when they work? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Step 1: Configure development environment for pyodbc Python development. To learn more, see our tips on writing great answers. How to determine chain length on a Brompton? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. But what about when executing an INSERT or UPDATE? What screws can be used with Aluminum windows? @Ben Yes! FWIW, I also added option=4 to my connection string. 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!). What kind of tool do I need to change my bottom bracket? <. operating systems this will build from source. Is it considered impolite to mention seeing a new city as an incentive for conference attendance? Thanks for contributing an answer to Stack Overflow! Zero output columns would explain the empty query description you got. nature. @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). This cookie is set by GDPR Cookie Consent plugin. Spellcaster Dragons Casting with legendary actions? 90% of the time, the query will execute successfully and a dataframe is returned, then 10% of the time cursor.description is empty. Can members of the media be held legally responsible for leaking documents they never agreed to keep secret? You 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. 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. How to intersect two lines that are not touching, YA scifi novel where kids escape a boarding school, in a hollowed out asteroid. Have a question about this project? "expected behavior" ". Well occasionally send you account related emails. 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. Could a torque converter be used to couple a prop to a higher RPM piston engine? sql_connection = pyodbc.connect(connect_string) Do we really need a pyodbc cursor and why? The issue has not appeared again since.. These cookies ensure basic functionalities and security features of the website, anonymously. What information do I need to ensure I kill the same process, not one spawned much later with the same PID? Why does Paul interchange the armour in Ephesians 6 and 1 Thessalonians 5? What does the "yield" keyword do in Python? Using pyodbc my standard start is something like. in which SQL command contains multiple SELECT commands and IF statements. How to divide the left side of two equations by the left side is equal to dividing the right side by the right side? 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). You signed in with another tab or window. The pyodbc 5.x versions will only support Python 3.7 and above. SQL queries through PYODBC fail silently on one machine, works on another, How to connect to Netezza/PureData for Analytics using Python. driver: SQL Server. If the error returned is still "No results. columns = [col_desc[0] for col_desc in cursor.description]. Are you sure your SQL is just a SELECT statement, or is it a SQL script that includes multiple SQL statements? Older version however, 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. Please post an ODBC trace. connection_hostname In python 3.4, zip is an iterator. The following are 30 code examples for showing how to use django.db.connection.cursor () . Does Python have a ternary conditional operator? is a valid SQL Query. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. pyodbc Find centralized, trusted content and collaborate around the technologies you use most. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. 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. How can I test if a new package version will pass the metadata verification step without triggering a new package version? Not the answer you're looking for? I am reviewing a very bad paper - do I have to be nice? 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. by doing: Writing this, i understand that doing for col in colnames could be replaced by for colindex in range(0, len()) but you get the idea. 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. print("Columns are none!!!!!!! cursor = connection.cursor() Does Chain Lightning deal damage to its original target first? fetch all the rows in the memory it's a very bad idea. query like "SELECT col1 FROM table1 LIMIT 1" using just pyodbc and see if 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. 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. Already on GitHub? 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 For example, an UPDATE statement, or a statement that is not a data query (e.g. Tags: Does Python have a ternary conditional operator? I believe the error related to the bug above is somewhere in the middle of the trace file. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. These are need a suitable C++ compiler on your computer to install pyodbc, for all operating systems. 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. 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. implements the DB API 2.0 specification but is If your version of the ODBC driver is 17.1 or later, you can use the AAD interactive mode of the ODBC If the error returned is still "No results. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. unlikely to be the cause of your issues, but be on the lookout for a couple Each row of returned data is represented in the returned list as a list of field (column) values. 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. columns : sequence, default None 5 How to create a dictcursor in Python MySQL? <. How to determine chain length on a Brompton? Not the answer you're looking for? @BenyGj Yeah, this is not intended for large amounts of data. 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? Previous SQL was not a query." Get your results from the local db It seems the issue is somehow related to a timeout or something similar in Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. contain special characters / emojis) and the use of more unusual data types, perhaps specific to MySQL. The first query has the majority of those unions commented out for Asking for help, clarification, or responding to other answers. if cursor.description is None: What information do I need to ensure I kill the same process, not one spawned much later with the same PID? can one turn left and right at a red light with dual lane turns? connect_string = f"DRIVER={{{self.driver}}};SERVER={self.server};PORT={self.port}; " pip install pyodbc --upgrade " reports that pyodbc 4.0.26 IS the latest version, so that road is closed, Update python then? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Can dialogue be put in the same paragraph as action text? 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. in the result (any names not found in the data will become all-NA The cookie is used to store the user consent for the cookies in the category "Performance". On Windows, be Moreover, this seems to happen at random. 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? Column names to use. 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. you probably want to look at the last one! Also I did not mention this before but I am running this in a container in aws but I have also produced this error locally. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. Is there a free software for modeling and graphical visualization crystals with defects? This cookie is set by GDPR Cookie Consent plugin. [u'DateTime', The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". If you have something, please reopen or comment if you figured something out that might be useful for others. data = self._fetchall_as_list(cursor) 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. In that case, I'm afraid I'm a bit stumped. chunksize=chunksize, 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. I'll give both these a shot, thank you. 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. is bringing back multiple result sets, so you may need to call nextset() sure to specify 32-bit Python or 64-bit: I can execute queries against database and get data very reliably. 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. Cursors 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? The query is a relatively simple one. 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. 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. Assuming you know you column names! 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. Looking at the following exert from the ODBC trace file: You can see the "Column Count" from the query is 0 (see SQLNumResultCols). Connect and share knowledge within a single location that is structured and easy to search. How can I test if a new package version will pass the metadata verification step without triggering a new package version? 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. print the same SQL scripts and can confirm that at final stage prior to Please note that you'll have to import psycopg2.extras for that to work. 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. Can a rotating object accelerate by changing shape? Making statements based on opinion; back them up with references or personal experience. Assuming you know you column names! This is a database cursor, which provides the context of the operation being executed. Can I ask for a refund or credit next year? I am trying to run a SQL command using pyodbc in python. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Is it possible to get more verbose logs out of the driver? frame.from_records accepts columns as None, definition below: Why is Noether's theorem not guaranteed by calculus? Step 3: 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. Not the answer you're looking for? Each row of returned data is represented in the returned list as a list of field (column) values. Attachment: Zip of ODBC Trace files (SUCCESS log (v.4.0.24) and FAIL log (v.4.0.25). How can I remove a key from a Python dictionary? Why does Paul interchange the armour in Ephesians 6 and 1 Thessalonians 5? If necessary I could post redacted versions of these queries with column Analytical cookies are used to understand how visitors interact with the website. In this way, the routine doing the database call doesn't need to know anything about the data that it's handling. Please let me know what additional information might be helpful and thank you! cursor.execute(sql_query) Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Two faces sharing same four vertices issues. 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. Asking for help, clarification, or responding to other answers. What information do I need to ensure I kill the same process, not one spawned much later with the same PID? For that reason, your comment is completely superfluous to me. Mainly going off @Torxed response, I created a full generalised set of functions to find the schema and data into a dictionary: def schema_dict(cur To learn more, see our tips on writing great answers. execute fine. Why is a "TeX point" slightly larger than an "American point"? To learn more, see our tips on writing great answers. Sign in Content Discovery initiative 4/13 update: Related questions using a Machine How do I connect to a MySQL Database in Python? Those are fairly pyODBC uses the Microsoft ODBC driver for SQL Server. Here is such a routine: I like @bryan and @foo-stack answers. In the scenario you described, I would normally expect a column count of 5. Therefore, I would think the below outcomes are acceptable, in order of preference. Python: How can I find the dimensions of a matrix in Python? for col in cursor.columns(table='SOURCE'): print(col.column_name) The issue must have been rooted in an inappropriate network configuration perhaps? Connect and share knowledge within a single location that is structured and easy to search. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Openbase is the leading platform for developers to discover and choose open-source. crsr.columns(table='') should return always the column description for the given table, "observed behavior". Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. DROP INDEX print(result) Can someone explain the difference between these ODBC cursors and SQL Server type cursors (assuming I'm correct that they are different)? Thank you @keitherskine, Hi @keitherskine I was finally able to reproduce the issue. Unfortunately, I do not have much of an update. On Sat, Feb 13, 2021 at 08:16 Keith Erskine ***@***. Find centralized, trusted content and collaborate around the technologies you use most. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. @BenLutgens Because the example produces a. Update: by default, pypyodbc sets lowercase = True. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 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. 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) ?. The pyodbc 4.x versions will be the last to Python cursor3 : psycopg2SQLCURSOR(FETCH, By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. statement, or is it a SQL script that includes multiple SQL statements? 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. python pyodbc: Closing the cursor before conn.commit()? However, this software doesn't come with Microsoft support. Connect and share knowledge within a single location that is structured and easy to search. Not the answer you're looking for? Only difference for creating logs: pyodbc.pyd exchanged (v.4.0.24 - v.4.0.25). For documentation, see pyodbc documentation. Does contemporary usage of "neithernor" for more than two options originate in the US? 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! chunk_size=200000 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.