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Does MySQL ignore null values on unique constraints?
...ou can have one UNIQUE empty value by inserting with the value of an empty string.
Warning: Numeric and types other than string may default to 0 or another default value.
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How to dynamically build a JSON object with Python?
...
You build the object before encoding it to a JSON string:
import json
data = {}
data['key'] = 'value'
json_data = json.dumps(data)
JSON is a serialization format, textual data representing a structure. It is not, itself, that structure.
...
Set database timeout in Entity Framework
...ic MyDatabase ()
: base(ContextHelper.CreateConnection("Connection string"), true)
{
((IObjectContextAdapter)this).ObjectContext.CommandTimeout = 180; // seconds
}
}
If you want to define the timeout in the connection string, use the Connection Timeout parameter like in the...
jquery - return value using ajax result on success
... * xResponse method is made to return jQuery ajax response
*
* @param {string} url [your url or file]
* @param {object} your ajax param
* @return {mix} [ajax response]
*/
$.extend({
xResponse: function(url, data) {
// local var
var theResponse = null;
// j...
What exactly is RESTful programming?
...
An architectural style called REST (Representational State Transfer) advocates that web applications should use HTTP as it was originally envisioned. Lookups should use GET requests. PUT, POST, and DELETE requests should be used for mutation, creati...
How do I convert a string to a double in Python?
I would like to know how to convert a string containing digits to a double.
3 Answers
...
Getting a timestamp for today at midnight?
... get today's date without any references to time, and then pass it to the 'string to time' function which converts a date and time to a epoch timestamp. If it doesn't get a time, it assumes the first second of that day.
References:
Date Function: http://php.net/manual/en/function.date.php
String T...
SQLite - How do you join tables from different databases?
...lQuery"></param>
public static DataTable GetDataTableFrom2DBFiles(string attachSQL, string sqlQuery)
{
try
{
string conArtistName = "data source=" + path + ";";
using (SQLiteConnection singleConnectionFor2DBFiles = new SQLiteConnection(conArtistName))
{
...
Assigning variables with dynamic names in Java
...lt;Integer>();
for (int i = 1; i < 4; i++) {
n.add(5);
}
Map<String, Integer> n = new HashMap<String, Integer>();
for (int i = 1; i < 4; i++) {
n.put("n" + i, 5);
}
It is possible to use reflection to dynamically refer to variables that have been declared in the sou...
How to check if function exists in JavaScript?
...luating to true, not necessarily a function (e.g. it could be a boolean, a string, etc). For example see jsfiddle.net/j5KAF/1
– Ohad Schneider
Apr 13 '14 at 7:53
...