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Getting “Lock wait timeout exceeded; try restarting transaction” even though I'm not using a transac
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You are using a transaction; autocommit does not disable transactions, it just makes them automatically commit at the end of the statement.
What is happening is, some other thread is holding a record lock on some record (you're updating every record in the tabl...
Reading a huge .csv file
I'm currently trying to read data from .csv files in Python 2.7 with up to 1 million rows, and 200 columns (files range from 100mb to 1.6gb). I can do this (very slowly) for the files with under 300,000 rows, but once I go above that I get memory errors. My code looks like this:
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Insert into a MySQL table or update if exists
I want to add a row to a database table, but if a row exists with the same unique key I want to update the row.
11 Answers
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Print multiple arguments in Python
... your current code using %-formatting, you need to pass in a tuple:
Pass it as a tuple:
print("Total score for %s is %s" % (name, score))
A tuple with a single element looks like ('this',).
Here are some other common ways of doing it:
Pass it as a dictionary:
print("Total score for %(n)s i...
Android encryption / decryption using AES [closed]
...here a good example of how to encrypt and decrypt image and other files with AES on Android?
11 Answers
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Programmatically Request Access to Contacts
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As per this documentation on apple's site (scroll down to Privacy in the middle of the page), access to the address book must be granted before it can be access programmatically. Here is what I ended up doing.
#import <AddressBookUI/AddressBookUI.h>
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How to write character & in android strings.xml
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Encode it:
&amp;
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T-SQL stored procedure that accepts multiple Id values
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Erland Sommarskog has maintained the authoritative answer to this question for the last 16 years: Arrays and Lists in SQL Server.
There are at least a dozen ways to pass an array or list to a query; each has their own unique pros and cons.
Table-Valued Parameters....
What size should apple-touch-icon.png be for iPad and iPhone?
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One icon for iOS 180x180 px and one for android 192x192 px (declared in site.webmanifest).
<link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png">
<link rel="manifest" href="/site.webmanifest">
#### site.webmanifest
{
"name": "",
"short_name": "",
"ico...
iphone - how can i get the height and width of uiimage
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edited Jul 18 '16 at 14:33
Ryan Brodie
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