Get DataFrame Column Names. Use code from my answer here to build a list of dictionaries for the value of output['SRData'], then JSON encode the output dict as normal. First, establish a connection to the PostgreSQL database server by calling the connect() function of the psycopg module. Also getting column description using Cursor.description works fine. How to merge two dictionaries in a single expression? When data is available is fully correct. Inserting multiple rows into the table. Allows Python code to execute PostgreSQL command in a database session. numRows(numRows が指定されていない場合はcursor.arraysize)で指定された行数のデータをもってくる。 I'm using bottlepy and need to return dict so it can return it as JSON. Help us understand the problem. # tasklist /fi "imagename eq python. The cursor description attribute provides metadata about the columns of the result set returned by the execute method.descriptions is a tuple of column tuples. pythonのsqlite3でそのような動作をさせたくて調べた結果をメモします。 結論からいえばテーブル名を取得できるような仕組みはおそらくなさそうsqlite_masterというテーブルにアクセスすればできそう(ちゃんと調べたらありました。別途記事にし Subscribe. cursor.execute("PRAGMA table_info(tablename)") print cursor.fetchall() And you should get back a printed list of tuples, where each tuple describes a column header. 大量データ取得の場合、python実行端末では、たくさんのメモリを使用します。, 問合せ結果のすべての行を取り出し、それらをタプルのリストとして戻します。 # tasklist /fi "imagename eq python. By following users and tags, you can catch up information on technical fields that you are interested in as a whole, By "stocking" the articles you like, you can search right away. The Database API (in this case the Oracle API) is one example. Check if a given key already exists in a dictionary, Iterating over dictionaries using 'for' loops.    指定された行数のデータをもってくる。, - データ取得方法 その3 The problem is that with Cursor.columns sometimes I get data and sometimes not. Python Update Cursor, Delete Rows Between Values. Python MySQL Select From To select only some of the columns in a table, use the How to Get the Maximum Value of a Column of a MySQL Table Using Python. print(f'{desc[0][0]:<8} {desc[1][0]:<15} {desc[2][0]:>10}') Here we print and format the table column names. This tutorial shows you various ways to query data from PostgreSQL table in Python using psycopg. This has application for a lot of things. value - python pyodbc cursor get column names, # interpreted by python as zip((a,1,2),(b,1,2)), 'DRIVER={SQL Server};SERVER=server;DATABASE=ServiceRequest; UID=SA;PWD=pwd', """SELECT SRNUMBER, FirstName, LastName, ParentNumber FROM MYLA311""", # build list of column names to use as dictionary keys from sql results. Get a clone of this cursor. SELECT column_names FROM table_name ORDER BY column_name DESC statement will be used to sort the result in descending order by a column. Execute the SELECT query using the cursor.execute() method. I would like to know how to get the position of the cursor (blinking line in any text control) to insert there a string. Similar to @James answer, a more pythonic way can be: fields = map (lambda x:x [0], cursor.description) result = [dict (zip (fields,row)) for row in cursor.fetchall ()] You can get a single column with map over the result: extensions = map (lambda x: x ['ext'], result) or filter results: We can then refer to the data by their column names. [key[0] for key in cursor.description] Helps us sort out garbage data that cursor.description can return ( hence the [0] ), and build a list out of the column names. The cursor.columns() call intermittently fails to return the columns in a table. desc = cur.description The description attribute of the cursor returns information about each of the result columns of a query. (4 replies) Hi, Is there a way of retrieving the value of columns in the rows returned by fetchall, by column name instead of index on the row? The cursor.columns() call intermittently fails to return the columns in a table. Call the get_results_from_sfqid() method in the Cursor object to retrieve the results. The clone will be completely unevaluated, even if the current instance has been partially or completely evaluated. We get the column names from the description property of the cursor object. In Python, the cursor has many functions. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. #cur.arraysize 設定 デフォルトは100。サンプルでは1000に設定, #fetchallを使用したプロセスメモリ情報を取得(後述)   Cursor.fetchmany Each tuple in the list contains values as follows: (column_name, type, None, None, None, None, null_ok, column_flags) The following example shows how to interpret description tuples: ・全てのデータをPython実行端末にもってくるので、取得データ分メモリを使用する I’m using bottlepy and need to return dict so it can return it as JSON. また、データがない場合は空のリストが戻されます。, Oracleからデータを読込む単位はcursor.arraysizeで設定した値(データ件数)となります。, クライアントとOracleの間のデータ取得のやり取りが多い場合、データ取得のパフォーマンスに影響を与えるますので、パフォーマンスが遅い場合、cursor.arraysizeを調整します。, 簡単に言うと To exercise the bug, when I create table names with the following lengths (and sometimes other lengths) as … "A.M" wrote: The problem is I don't know how to find out what are the column name and type that comes out of query (each row in cursor). 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