sql - Using python psychopg2 to get a count on all variables in the database that contain a specific string -


i have list, words = [word1, word2, word3, ...] want use sql return number of times each word appears in column of sql file. can't figure out how pass variable sql query. appreciated! code far looks like:

import psycopg2 sql  word in words     conn = sql.connect(**params)    c = conn.cursor()         #create query , parameters usernames , ids     query = """ select count(column a) file             column similar '% **variable word** %'              limit 1000; """      try:        c.execute(query)     except:        conn.commit()        print("error in query")     result = c.fetchall()

also, count return total number of times word appears or number of lines of column in appears? (will count of in "the team won game" return 1 or two?)

the replaceable parameter flag used psycopg2 "%s", , use plain "%" in query replaceable parameters need double (i.e., "%%"). code should like:

 query = """select count(column_a) file         column_a similar '%%%s%%'         limit 1000;""" try:    c.execute(query, word)

this should return number of lines in word appears, not total number of occurrences of word in lines.

your example has space in column name used; i've substituted underscore, if column name contains space, name should double-quoted in query.


Comments

Post a Comment

Popular posts from this blog

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m
Read more

javascript - Z-index in d3.js -

i have map , when hover effect on region of map below yellow line , circle, last ones disappear. how can solve problem? http://jsfiddle.net/ot21n9qx/ var arc = g.append("path") .style("fill", "none") .style("stroke", "yellow") .style("stroke-width", 2) .attr("d", "m" + pathorigin[0] + "," + pathorigin[1] + " q" + svgpoint[0] + "," + pathorigin[1] + " " + svgpoint[0] + "," + svgpoint[1]); var circlesize = d3.scale.linear() .domain([0, 0.5, 1]) .range([4, 10, 4]); svg not have z order draws objects in order created. need create path , circle after create highlight regions. here forked fiddle: http://jsfiddle.net/o00fzgaf/1/
Read more