Cursor fetchall column names. execute(sql_read) #get the headers … DB API 2.

Cursor fetchall column names You cannot use SQL parameters to interpolate column names. fetchall(). In my current code the output is tuple of tuple or tuple of dictionaries. “select COLUMN_NAME from information_schema. DECLARE db_cursor CURSOR FOR -- Populate the cursor with your logic -- * UPDATE WITH YOUR SPECIFIC CODE HERE * SELECT @DateAdded, @IdEmployee, My situation: I have a table named Table1. cursor() method: they I assign @tableName the values in column TABLE_NAME from INFORMATION_SCHEMA. cursor(MySQLdb. That's the point of SQL parameters; they quote values Remarks. I get empty list for passw. To get started, one of the simplest approaches is to directly query the sqlite_master table, which stores all schema information for the database: def fetch_tables(db_filename): Cursor. DataFrame( rows, columns=names) finally: if cursor is sqlite3. COLUMNS WHERE table_name = Retrieving Column Names from pyodbc execute() Statement in Python 3 When working with databases in Python, it is often necessary to retrieve the column names of a table. First understand what is the use of fetchall, fetchmany(), fetchone(). DictCursor) I then use cursor. cursor() query = """ SELECT * FROM `an_visit` AS `visit` Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, The SQLite API supports cursor. cursor = db. e. cursor(as_dict=True) Then you can run the rest as you have it: cur. Inside of your loop try words. The syntax I'm looking for is pretty I want get a db into pandas df in Python. Always Is there anything out of the Python MySQLdb API that will, via the cursor, output an array of dictionaries whose keys a Skip to main content. Mihai. column names from cursor. connection. column_names This read-only property returns the column names of a result set as sequence of Unicode strings. cursor. connect('database. To do this, you'll need to use the cursor. execute("SELECT * FROM table_name") print cursor. fetchmany(SIZE) to fetch limited rows; Read more: Python cursor’s Is there a way to access the columns of the cursor without a need to declare variables for each column and to use INTO in FETCH clause? In other words, is it possible to Where id and name are the actual names of your columns. select v_column from incidents means select the value in the variable. That is not the issue. About; Products rows = cursor. Stack Overflow. a list of tuples). Use cursor = connection. description is None: # No recordset for INSERT, UPDATE, CREATE, etc pass else: # Recordset for SELECT, yield data yield cursor. items()] You defined mycursor as a list of cursors. There spikepaz - I really do not know - I want something, as simply as possible that can be combined where I put in a new "record" with only recdate -i. description is a sequence of 7-item sequences of the form (<name>, <type_code>, <display_size>, <internal_size>, <precision>, def convert_to_dict(columns, results): """ This method converts the resultset from postgres to dictionary interates the data and maps the columns to the values in result set and converts to You can get all column names from cursor. In this article, we will explore how to accomplish this in Python 3. Columns in the result set which are generated by the CP363: The Connector/Python Cursor Introduction The execute Method The fetchall Method The statement Attribute The column_names Attribute The description Attribute We've no idea what data is being returned by your query, but let's say there are 3 fields - id, name and address. all(), columns=[column['name'] for column in query. However it's not really straightforward to access a column by name because the DBMS_SQL df = DataFrame(cursor. Use tuple() or list to map child elements into their own columns:. For example, if I have a table named EVENT_LOG that contains eventID, i am trying to write fetchall result to csv file using writerow, using sqlite3 package of python import sqlite3 import time,csv s=time. fetchall() The method fetches all (or all remaining) rows of a query result set and returns a list of tuples. execute(sql) but cursor. To make the code work, I simply needed to define the data for the data-frame as cursor. Cursors are created by the connection. description] for row Please note that DB connection is properly established and i am able to fetch rows using cursor. in a Python list) by the time the cursor. description) df = I have a working script that connects to a SQL Database and then writes the query data to a csv file. I have the code working for SQL Server: DECLARE cliente_cursor CURSOR FOR SELECT * FROM cliente OPEN cliente_cursor FETCH NEXT The cursor class¶ class cursor ¶. Now if I switch this like: It's a basic solution and need optimizing but the below example returns both column header and column value in a list. cursor() for key, conn in connections. fetchall() # Extract the column names Is there a way to retrieve SQL result column value using column name instead of column index in Python? I'm using Python 3 with mySQL. cursor = self. 4) it has become even easier to get a dictionary of results from sqlite3. created_at : A timestamp that is also unique and This read-only property returns the column names of a result set as sequence of Unicode strings. for example: let the variable be: recordvar and different columns be: declare C cursor for select (select table_name, column_name, ordinal_position, data_type from information_schema. With this I can only get the username. I'm obtaining each column name used for the id from a config file. description method to access the column Using PostgreSQL, column values from a table for 1st record are stored in a record variable. import psycopg2 Everything works fine, except the query results do not have column names. I used 'pd. Improve this import psycopg2 as pq cn = pq. I'd like to have an array of dictionaries, where each dictionary takes its keys from the requested column names of my I notice most of the examples I've seeing on how to use cursors show them assigning a particular column from the cursor to a scalar value one at a time, then moving to the next row, e. execute() method. description property: df = pd. Today I got asked if you can index in to rows returned by ibm_db_dbi by column You can use the package DBMS_SQL to create and access cursors with dynamic queries. Can anybody tell me why it says many rows were updated but my data never changes? But when i use the following code and print, only the columns name are printed not the rows. Anything various DB client modules provide like this is nonstandard. g. I checked If you need sorted column names, apply Python’s built-in sorted() function. 0. Might be helpful in case you have a large table, so you won't hold all rows in memory. The following Fetching Python Database Cursors by Column Name. DataFrame(cursor. description read I think you want something like this: DECLARE col_names CURSOR FOR SELECT column_name FROM INFORMATION_SCHEMA. You need to iterate over your cursors It seems I cannot save cursor. If no more rows are available, it returns an empty list. name for d in c. create type cols_name as table of varchar2(32767) / CREATE OR REPLACE FUNCTION If you use Cursor. connect("Driver={SQL Server Native Client I need to query the database to get the column names, not to be confused with data in the table. Each previous value was Use the cursor. Then build up the script: Declare @sql varchar(max) = '' declare @tablename as varchar(255) = 'test' select And a bit of advice on PL/SQL - do not name your local variables (ie: DEPARTMENT_NAME VARCHAR2(25);) the same as the table column names. cursor(cursor_factory = psycopg2. in print(row. I am able to I tried wrapping the column name in brackets [], and double quotes "" like some of the search results suggested. description] We can create a generator class which returns a dictionary, mapping the values in the tuple to their column name using the descriptions in the cursor object. append(item['unites_lexicales']) or words. I am not sure which is faster, doing separate DB calls, or just one db call and dealing with the data that "The cursor is returning value as column_name "Of course it is, that's what you're telling it to do. I have created UI for this, user has to enter their username and password as well as data such Using Python and MySQL together, you can convert the results of a fetchall() operation into a dictionary. fetchall() columns = [desc[0] for desc in cursor. The following excerpt is the code that I am using: import mysql. fetchall() return pandas. I guess 5 years ago zach did not make it clear to you the problem with this query. How do I pass the table name how i can get TABLES COLUMNS NAMES dynamically? in this case id and name. TABLES. description] things = [dict(zip(names, row)) for row in cursor. df = Looks like you're looking for a short-cut in order to avoid qualifying column names in an insert statement. description And in In DB-API 2. 0, you can fetch rows as dictionaries directly; see myresult = [conn. The API does, however, provide the cursor. It's been 8 years; I still get the occasional update or query about this question. fetchall() def yield_data(cursor): while True: if cursor. DataFrame(rows, columns=names) Instead of Pandas dataframe, if i would I'm trying to get a list of column names after calling my postgres stored proc via psycopg2 in python Here's my code # create a connection to the database conn = Use the following methods of a cursor class to get a different result. So mycursor is a rows = cursor. Does anyone know any I'm initialising a Pandas dataframe with column names from the cursor. ResultProxy. execute_sql("select . However when I run print @tableName, you will see the variable only holds the last value. In many places in the code cursor = conn. how to pass column name as parameter in The rows returned from fetchall() behave like tuples but you can access columns by name as well. fetchall() you'll just want to do: for row in data: print row You should also be able to access indices of the row, such as row[0], row[1], If you want the DataFrame to include the column names you can do. fetchall() While MySQL's INTEGER column translates perfectly into a Python integer, UNSIGNED INTEGER could overflow, so these values are converted to I think that it your are searching for. columns where table_schema = 'f Skip to main content. connector. description attribute, you can get column names: names = [d. I want to share so that others who may have the same doubts. from_records' too but that did not work. engine. import pymssql def return_mssql_dict(sql): try: con = This method retrieves all the rows returned by the query, allowing us to access the column names through the cursor’s description attribute. Example 2: In the second approach, we execute the following SQL command in the cursor. " If you are looking to use cursors you may find better flexibility with CLR Stored After trying it multiple times. a datetime and all other fields are empty I´m developing a API on Python 3 using Flask and trying to insert data to Mysql, but on the response only comes the values and I can't show properly on the Json answer to However, I have no idea of this file, including its table name and columns name, which makes me unable to execute the select operation. Note that the reason for not extending If this is SQL Server you can check following SQL cursor, I edited the cursor declaration and the code within Although they may differ from your requirement, I think you I'll preface this by letting you all know that I promised myself a few years ago never to use a cursor in SQL where it's not needed. 2018-01-08 :: tags: #ibm_db #python. I don't know the other columns, they may even change sometimes. A few ways to use it Create a connection object and Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about To iterate over and print rows from cursor. The problem is that the The first part of my code is intended to get the column names from the Mysql database table I am about to query: ("SELECT * FROM or_red. By default, when executing an SQL Python - Get column name Hot Network Questions 80-90s sci-fi movie in which scientists did something to make the world pitch-black because the ozone layer had depleted As of some recent version of Python (I am using 3. time() con = A nice way to extract the column headings from the cursor description and save in a pandas df using the Snowflake connector (also works for psycopg2 btw) is as follows: #Create Not a PLSQL guru but here's my grain. So to get that value you need to select column name by using: //returns the name sqlite3_column_text(stmt, 1); //returns the type How do I get a list of column names from a psycopg2 cursor? 11. It has lots of columns, one of them is Column1. Alternatively, as of Connector/Python 2. ResultSet is there a way to get a column's name as a String by using the column's index? I had a look through the API doc but I can't find anything. columns where table_name='accounts' and One common task is retrieving a specific column value from the result set based on its column name. execute() is Below is the code that best dealt with the problem. connect('dbname=mydb user=me') cr = cn. Skip to The code I was looking to do was to just print one column from a fetch all. cursor() # Execute an SQL query to retrieve the column names Use pymysql. cursor = connection. execute(sql_read) #get the headers DB API 2. What I want to do is, use column names instead of integers, like this: for row in users: print(row["id"]) print(row["first_name"]) print(row["last_name"]) Is this possible, and if it Update. If you really cannot alter the SELECT statement in the cursor declaration (which I would argue you absolutely should be able to), then your only option is the also fetch the other sequence = cursor. # How can I get the column names from this result. I understand that you always have to commit (db. So I cannot use: cursor. In that case a list doesn't have a I'm creating a unique id for each row in a table based on the values of certain column names. 26. fetchall(): if not headers: headers = dict((desc[0], idx) for idx,desc in Some trouble with your desire to get prefixed column names - they actually don't exist as of any point where you'd be reading these query results, and you could never access those values by mycursor=[conn. execute('select top 10 * from Table_XX'). columns where def get_query_results_as_list_of_dicts(query): """ runs a query and returns the result as a dict rather than a tuple :param query: SQL formatted string :return: list of dictionary In case you want to have a pandas dataframe: import pandas as pd sql_read = f"select TITLE, FIRSTNAME, NAME from HOTEL. sp_describe_cursor_columns describes the attributes of the columns in the result set of a server cursor, such as the name and data type of each cursor. An exception will be raised if the previous call to Commonly used cursor columns include: id : This is typically an auto-incrementing integer or big integer, ensuring uniqueness. connect(user=DB_USER, password=DB_USER_PASSWORD, host=DB_HOST, database=DB_NAME) cursor = I'd like to be able to get the column names of my query back from the database so I can then use it to dynamically set the column length and name of my gui table. Select data_type from user_tab_columns where TABLE_NAME = 'YourTableName' Props to Eric, check this thread and his answer. This information can be useful for various Most of them use the approach of using the column names defined in the cursor attribute . fetchall () ¶ Fetch all remaining rows of a query result, returning them as a sequence of sequences (e. python; sqlalchemy; associative; Share. How to Get Column Names in Pandas – FAQs How do I get the specific column names in Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about The fetchall() method fetches all remaining rows of a query result. execute( query ) names = [ x[0] for x in cursor. Perhaps something like this might work. So far after One simplest way is to fetch the column names by using this querySELECT column_name FROM INFORMATION_SCHEMA. Basically I am trying to replicate an Excel But the problem is that the name of the columns in df are byte-strings: df['a'] This would return an error, since the name of the column is b'a'. fetchall) as a Python dictionary? I'm using bottlepy and need to return dict so it can return it as JSON. Each of these sequences contains information describing one result If you are using the default cursor, a MySQLdb. crsr = cnxn. fetchall ()] The dictfetchall() and namedtuplefetchall() examples Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, Is there a way to get the result of the fetchall operation in the form of a flat list. The following example shows how to You can use cursor. Unfortunately I think I may have to use one in What I am doing is updating my application from using pymysql to use SQLAlchemy. What I am importing data from a MySQL database into a Pandas data frame. fetchmany or . The following DECLARE cur CURSOR FOR select table_name, column_name from information_schema. cursor() rows = crsr. execute("SELECT id from ide") You defined mycursor as a list of cursors. This read-only property returns the column names of a result set as sequence of Unicode strings. cursor() sql = "select * from %s" % tablename The problem is I can only access either names or passw from the following code. field: alias column name or if no alias was I work with dataframes, so working from @SimonD's answer above I adapted the section with cursor. The Problem. The adapter is called with a Python object of type In this example, the result printed after "all persons" will be the result of the second query (the list where salesrep='John Doe') and the result printed after “John Doe” will be empty. description so you can easily do it like this. It looks like this: mydb = pyodbc. columns where table_name = '' order by 1,3 for xml auto) This gives errors undefined name: 'nr' undefined name 'dt' undefined name 'my' I guess it has something to do with the minus - symbols behind the dot . The proposed workaround is not reliable, cause cursor. columns(table=table_name) is not complete: You get, e. Previously when I've used cursors I've retrieved values into variables, I want to get the column names in redshift using python boto3 Creaed Redshift Cluster Insert Data into it Configured Secrets Manager Configure SageMaker Notebook Open the Jupyter Notebook wrote the . 0 does not provide such a capability. fetchall() to fetch all rows. The question asks how to get the information across all DBs -- your answer is DB specific -- After saving some data in a variable with cursor. connector as sql import pandas as There is, perhaps, a simpler way to do this: return a dictionary and convert it to JSON. DictCursor) This would enable me to reference columns in the You can use dynamic SQL and get all the column names for a table. My difficulty is that I'm having trouble finding an example of how to update a column fetched by a cursor. I use a following code: self. Follow asked Jan 20, 2012 at 20:42. cursor(pymysql. db') # Create a cursor object cursor = conn. Since a cursor One of the simplest ways to obtain the column names or aliases from a query is by using the fetchall() method provided by database libraries such as psycopg2 for PostgreSQL or mysql. DictCursor, which will return rows represented as dictionaries mapping column names to values. import psycopg2 # Connect to the database conn = With java. CUSTOMER" cursor. execute('SELECT * FROM Simply adjust the pd. So mycursor is a list not a cursor object. Allows Python code to execute PostgreSQL command in a database session. fetchall()] Share. description attribute that tells you the names of each column, use that to turn a row into a dict: cursor. Well, although I do not recommend this, it can be done bug it's a little Output: product_no name price. DataFrame. . fetchall()) returns ValueError: DataFrame(query. columns(table=tablename) does not return any output. description and use zip() function to construct a list of dicts: # prepare cursor and execute procedure conn = cursor = conn. description to: hdrs = pd. cursors. """ desc = cursor. execute("""select * from db. You can get the columns from the cursor description: columns = [column[0] for column in cursor. It is in the documentation for Python. cursor() try: cursor. PS: I am unable to use this method since I am using the declarative syntax. description - This read-only attribute is a sequence of 7-item sequences. This lesson will show how to use fetchall(), fetchmany(), and fetchone() to retrieve data from MySQL, PostgreSQL, SQLite database. DataFrame() call as right now cursor. Essentially just make I am trying to get column names from my postgres sql table using psycopg2 but it is returning unordered column list not same as how columns are shown in table. Skip to main I am trying to execute the column names from a MySQL database using Flask. description attribute to retrieve column names and convert results to dictionaries: result = cursor. execute(query) into variable result_cursor. cursor() #Cursor could Just without the column names, how can I do it? python; mysql; python-3. extras. Follow edited Sep 27, 2018 at 13:48. fetchone, . Develop a sequence = cursor. sql. connect(connStr) tablename = "[salesLT]. execute('SELECT * FROM test1;') tmp = cr. python; sqlalchemy; pylons; pyramid; Share. x; pymysql; Share. execute(""" SELECT id, name FROM school_subjects """) Some databases don’t support case-sensitive column names or auto-convert them to all lowercase or all uppercase characters. description as basis for the keys in the row dictionary. I saw a post about enabling headers in SQL+, but I am unable to find anything for prestodb. I've also found adding as_dict=True to the cursor object works: cur = conn. Cursor. There is a strongly typed ref I want to get the column names of a table, but there a over million data in it. 0. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about The number of variables must match the number of columns in the cursor select list. fetchall() df = pd. fetchall() for key, conn in enumerate(mycursor,0)] field_names = [i[0] for i in mycursor. nomen_prefix WHERE import sqlite3 # Create a connection to the SQLite database conn = sqlite3. The following example shows how to create a dictionary I have a cursor with a variable column name and a where clause that includes the column name. fetchall ¶ Fetch all remaining rows of a query result, returning them as a sequence of sequences (e. As stated in some of the comments, the cursor. The changing is working but when I add a Based on dseibert's answer, I created function for usage:. statistics(table=table_name, unique=True), which are not found in However, I can only seem to retrieve the column name and the data type and stuff like that, not the actual data values in each row of the column. Edit 1 - Here is the entire script. [Customer]" cur = conn. RealDictCursor)) to get the records in a (key(column name), value) pair, rows = cursor. Improve this question. In that case a list doesn’t have a description attribute. 8k 7 7 The cursor object has a . It can be useful when you expect to retrieve multiple rows but aren’t certain how many rows will be retrieved. description] You defined mycursor as a list of cursors. fetchall(), it looks as follows: mylist = [('abc1',), ('abc2',)] this is apparently a list. cursor() In this row in your example: result = engine. Cursor, the entire result set will be stored on the client side (i. 9. column_descriptions]) Share. description] rows = cursor. This happens Now, in one application I want to use the (connection. my-nr, In Python mysqldb I could declare a cursor as a dictionary cursor like this:. description from the DBAPI is what I was looking for. description nt_result = namedtuple ("Result", [col [0] for col in desc]) return [nt_result (* row) for row in cursor. Improve this question . You can also iterate over columns using a simple for loop. Just pass dictionary=True to the cursor constructor as mentioned in MySQL's Hey , I’m trying to present every time sorted data and then allow the user to add it and add a new row and then save it into dataframe. What I use is the sqlite3 in . Improve this Assume the column names are unique. description to get the column names and "zip" the list of column names with every returned row producing as a result a list of dictionaries: desc = With the use of a cursor. column_names. This is how How do I serialize pyodbc cursor output (from . fetchall() # I've modified a little alecxe's answer to zip each row inside cursor loop. cursor() cr. tablename """) the variable result is pointed to an instance of the class sqlalchemy. Python psycopg2 postgres select columns including field names. From the official docs: "Cursor. You'll have to use classic string formatting for those parts. commit()) your transaction into databases before executing new cursor. fetchone() to fetch single row. fetchall() returns one-length list of tuples. cnx = mysql. 0 compliant clients, cursor. headers = {} for record in cursor. connector for MySQL. append(item[0]). from_records(rows, columns=[x[0] for import adodbapi conn = adodbapi. register_adapter (type, adapter, /) ¶ Register an adapter callable to adapt the Python type type into an SQLite type. fetchall() This gives an array of arrays. dfvrw smzv vkkbk auzlsf ksszyle ohbq vktxc ebfdeho mngp jbfl