大约有 40,000 项符合查询结果（耗时：0.0601秒） [XML]
Objective-C: difference between id and void *
...tructures, this can be a critical difference. Declaring iVars like void *_superPrivateDoNotTouch; will cause premature reaping of objects if _superPrivateDoNotTouch is actually an object. Don't do that.
attempting to invoke a method on a reference of void * type will barf up a compiler warning.
a...
How do I exit a WPF application programmatically?
...is where from one window pop up another window and, in that window's window_closed event I added this code. all the windows disappear, but the program still runs beyond where after the pop up is created.
– diyoda_
Jan 5 '13 at 17:37
...
Rails hidden field undefined method 'merge' error
...
You should do:
<%= f.hidden_field :service, :value => "test" %>
hidden_field expects a hash as a second argument
share
|
improve this answer
...
CSS selector with period in ID
...e it does use dots in its ids. For example: "OpenLayers.Control.Attribution_7". I guess it helps with the internal code where they can have the javascript variable name be the same value as the id itself.
– Hoffmann
Jan 28 '14 at 17:44
...
How can I set the request header for curl?
...;q=0.8,en;q=0.6' \
-e localhost \
-A 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.65 Safari/537.36' \
'http://restapi.some-site.com/getsomething?argument=value&argument2=value'
In this example the referer (-e or --referer in curl) is '...
PostgreSQL: Modify OWNER on all tables simultaneously in PostgreSQL
...'s what I did:
Tables:
for tbl in `psql -qAt -c "select tablename from pg_tables where schemaname = 'public';" YOUR_DB` ; do psql -c "alter table \"$tbl\" owner to NEW_OWNER" YOUR_DB ; done
Sequences:
for tbl in `psql -qAt -c "select sequence_name from information_schema.sequences where sequen...
How to run SQL script in MySQL?
... This is what worked for me...source C:/Users/macombers/Downloads/midcoast_db.sql;
– Zack Macomber
Oct 3 '14 at 15:09
...
Get record counts for all tables in MySQL database
...
SELECT SUM(TABLE_ROWS)
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA = '{your_db}';
Note from the docs though: For InnoDB tables, the row count is only a rough estimate used in SQL optimization. You'll need to use COUNT(*) ...
rails 3 validation on uniqueness on multiple attributes
...
In Rails 2, I would have written:
validates_uniqueness_of :zipcode, :scope => :recorded_at
In Rails 3:
validates :zipcode, :uniqueness => {:scope => :recorded_at}
For multiple attributes:
validates :zipcode, :uniqueness => {:scope => [:recorded_at...
Get TransactionScope to work with async / await
...on.Enabled))
{
// connection
using (var connection = new SqlConnection(_connectionString))
{
// open connection asynchronously
await connection.OpenAsync();
using (var command = connection.CreateCommand())
{
command.CommandText = ...;
// run command asynchronously...