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sqlalchemy: how to join several tables by one query?
...atever):
class User(Base):
__tablename__ = 'users'
email = Column(String, primary_key=True)
name = Column(String)
class Document(Base):
__tablename__ = "documents"
name = Column(String, primary_key=True)
author_email = Column(String, ForeignKey("users.email"))
author = ...
Save Javascript objects in sessionStorage
...orage allows to save key/value pairs in a web browser. The value must be a string, and save js objects is not trivial.
9 An...
Automatically update version number
...build number.
There are 2 Gotchas:
Each of the 4 numbers in the Version string is limited to 65535. This is a Windows Limitation and unlikely to get fixed.
Why are build numbers limited to 65535?
Using with with Subversion requires a small change:
Using MSBuild to generate assembly version i...
How can I filter lines on load in Pandas read_csv function?
...das as pd
from time import time # not needed just for timing
try:
from StringIO import StringIO
except ImportError:
from io import StringIO
def zgrep_data(f, string):
'''grep multiple items f is filepath, string is what you are filtering for'''
grep = 'grep' # change to zgrep for ...
What are the uses of “using” in C#?
...
Things like this:
using (var conn = new SqlConnection("connection string"))
{
conn.Open();
// Execute SQL statement here on the connection you created
}
This SqlConnection will be closed without needing to explicitly call the .Close() function, and this will happen even if an exce...
Accessing members of items in a JSONArray with Java
...ust getting started with using json with java. I'm not sure how to access string values within a JSONArray. For instance, my json looks like this:
...
Python equivalent for PHP's implode?
...
Use the strings join-method.
print ' '.join(['word1', 'word2', 'word3'])
You can join any iterable (not only the list used here) and of course you can use any string (not only ' ') as the delimiter.
If you want a random order lik...
Cross-thread operation not valid: Control accessed from a thread other than the thread it was create
...olution you want then should look like:
UserContrl1_LOadDataMethod()
{
string name = "";
if(textbox1.InvokeRequired)
{
textbox1.Invoke(new MethodInvoker(delegate { name = textbox1.text; }));
}
if(name == "MyName")
{
// do whatever
}
}
Do your serious proc...
How to convert JSON to CSV format and store in a variable
...ap(function(row){
return fields.map(function(fieldName){
return JSON.stringify(row[fieldName], replacer)
}).join(',')
})
csv.unshift(fields.join(',')) // add header column
csv = csv.join('\r\n');
console.log(csv)
Output:
title,description,link,timestamp,image,embed,language,user,user_ima...
Map vs Object in JavaScript
...n be bypassed using map = Object.create(null). The
keys of an Object are Strings, where they can be any value for a Map.
You can get the size of a Map easily while you have to manually keep
track of size for an Object.
Use maps over objects when keys are unknown until run time, and when
...