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POExtracting values from SQLite database in Python
 

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  1. POExtracting values from SQLite database in Python
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    <p>I was trying to figure out how to work with SQLite database using python, but seem to be stuck. I think I am missing something basic. I was following this tutorial: <a href="http://docs.python.org/library/sqlite3.html" rel="nofollow">http://docs.python.org/library/sqlite3.html</a></p> <p>I set up a database such that it contains the following information:</p> <pre><code>import sqlite3 conn = sqlite3.connect('SQL_test_3') #this creates a seperate file c = conn.cursor() c.execute('''create table stocks (date text, trans text, symbol text, qty real, price real)''') data = [('2006-03-28', 'BUY', 'IBM', 1000, 45.00), ('2006-04-05', 'BUY', 'MSFT', 1000, 72.00), ('2006-04-06', 'SELL', 'IBM', 500, 53.00), ] for t in data: c.execute('insert into stocks values (?,?,?,?,?)', t) conn.commit() c.close() </code></pre> <p>My problems arise when I try to extract the data; the tutorial explains how to extract the data if one of the characteristics are satisfied, for example:</p> <p>(When I open the database in another file)</p> <pre><code>import sqlite3 conn = sqlite3.connect('SQL_test_3') c = conn.cursor() price = 53 t = (price,) c.execute('select * from stocks where price=?', t) print c.fetchall() </code></pre> <p>The above works perfect, but what if I want extract information for all the assets who's price is greater that 50, I can't do it. Doing price > 50 and price>? doesn't work...</p> <p>So my questions are:</p> <p>1) How do I extract information for an asset when the key criteria is fits in a given range, for example price > 50 or 40 &lt; price &lt; 70.</p> <p>2)And what if I wanted to have two criteria, for example information for IBM stocks, and if the stock was traded at, say, price greater than 50.</p> <p>I feel that my questions are very beginner/basic, but I couldn't find the answers to them in the tutorial.</p> <p>Any help is appreciated.</p> <p>Thanks in Advance.</p>
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    1. USAkavall
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    1. COI tried running your code and it works fine for me. Please post the exact code you tried using `>` and the output you got when you ran it.
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      1. USDuncan
    2. COSurely this is an SQL question, not a Python one?
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      1. POExtracting values from SQLite database in Python
      1. USDaniel Roseman
    3. CODuncan, I got that line to work with: price = 50 t = (price,) c.execute('select * from stocks where price>?', t) z4 = c.fetchall() print z4 Thanks
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