Databases
StackOverflow2013
Postsdbo
POAutomatically Load SQL table by reading data from text file
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POAutomatically Load SQL table by reading data from text file
    primarykey
    data
    text
    <p>I am trying to write a python script that is going to load the tables that I created in pyhton using SQL and populate them with data automatically that is coming from a text file. I am stuck on basic coding. I do have a general idea but I am getting errors when I try to run this approach. I have created 2 tables. I have read the file. the file is a comma seperated text file with no headers. </p> <p>first 3 lines of the file looks like this. </p> <pre><code>+ ---- + ----- + -------------------- + -------- + - + --- + ----- + | John | Smith | 111 N. Wabash Avenue | plumber | 5 | 1.0 | 200 | | John | Smith | 111 N. Wabash Avenue | bouncer | 5 | 1.0 | 200 | | Jane | Doe | 243 S. Wabash Avenue | waitress | 1 | 5.0 | 10000 | + ---- + ----- + -------------------- + -------- + - + --- + ----- + import sqlite3 conn= sqlite3.connect('csc455.db') c = conn.cursor() #Reading the data file fd = open ('C:/Users/nasia/Documents/data_hw2.txt','r') data = fd.readlines() #Creating Tables &gt;&gt;&gt; L = """create table L ... (first text, last text, address text, job text, LNum integer, ... constraint L_pk ... primary key(first, last, address, job), ... constraint L_fk ... foreign key (LNum) references LN(LNum) ... );""" &gt;&gt;&gt; c.execute(L) LN = """create table LN ... ( ... LNum integer, Interest float, Amount, Integer, ... constraint LN_pk ... primary key (LNum) ... );""" c.execute(LN) #Inserting into database for elt in data: ... currentRow = elt.split(", ")[:-1] ... insert = """(insert into LN values (%s, %s, %s);, %(currentRow[4], currentRow[5], currentRow[6]))""" ... c.execute(insert) </code></pre> <p>There is some syntax error here. The code stops working. I cannot figure out what I am doing wrong. The error is Traceback (most recent call last): File "", line 4, in OperationalError: near "(": syntax error</p> <p>I can not figure out what am I doing wrong</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USnasia jaffri
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POAutomatically Load SQL table by reading data from text file
      1. This table or related slice is empty.
      1. VTDownMod
    2. VO
      singulars
      1. POAutomatically Load SQL table by reading data from text file
      1. USnasia jaffri
      1. VTFavorite
    3. VO
      singulars
      1. POAutomatically Load SQL table by reading data from text file
      1. This table or related slice is empty.
      1. VTUpMod
    1. COWhat does `data_hw2.txt` look like? What's your database schema? How do you want to map from one to the other?
      singulars
      1. POAutomatically Load SQL table by reading data from text file
      1. USabarnert
    2. COIn the future, it really helps to know which statement raised the error instead of making us guess!
      singulars
      1. POAutomatically Load SQL table by reading data from text file
      1. USabarnert
    3. COAs a side note, you don't have to put `;` on individual SQL statements passed to `execute`; that's only required when you're using the command-line tool, or executing a SQL script.
      singulars
      1. POAutomatically Load SQL table by reading data from text file
      1. USabarnert
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload