大约有 34,900 项符合查询结果（耗时：0.0570秒） [XML]
Postgres unique constraint vs index
...------
con_id | integer |
ind_id | integer |
Indexes:
"master_con_id_key" UNIQUE CONSTRAINT, btree (con_id)
"master_unique_idx" UNIQUE, btree (ind_id)
In table description (\d in psql) you can tell unique constraint from unique index.
Uniqueness
Let's check uniqueness, just in case.
t...
Storing C++ template function definitions in a .CPP file
...ld prefer to have stored in a CPP file instead of inline in the header. I know this can be done as long as you know which template types will be used. For example:
...
Best way to work with transactions in MS SQL Server Management Studio
...example,
Begin Transaction
-Do some T-SQL queries here.
Rollback transaction -- OR commit transaction
If you want to incorporate error handling you can do so by using a TRY...CATCH BLOCK. Should an error occur you can then rollback the tranasction within the catch block.
For example:
...
How to place two divs next to each other?
...
Floating one div:
#wrapper {
width: 500px;
border: 1px solid black;
overflow: hidden; /* will contain if #first is longer than #second */
}
#first {
width: 300px;
float:left; /* add this */
border: 1px solid red;
}
#second {
border: 1px solid green;
overflow: hidden...
A Better Django Admin ManyToMany Field Widget
...
BlairBlair
12.8k77 gold badges4242 silver badges5454 bronze badges
...
Why does the order of the loops affect performance when iterating over a 2D array?
...he computer is inherently 1-dimensional. So while you imagine your array like this:
0,0 | 0,1 | 0,2 | 0,3
----+-----+-----+----
1,0 | 1,1 | 1,2 | 1,3
----+-----+-----+----
2,0 | 2,1 | 2,2 | 2,3
Your computer stores it in memory as a single line:
0,0 | 0,1 | 0,2 | 0,3 | 1,0 | 1,1 | 1,2 | 1,3 | 2,...
Method can be made static, but should it?
Resharper likes to point out multiple functions per asp.net page that could be made static. Does it help me if I do make them static? Should I make them static and move them to a utility class?
...
How do I select an element in jQuery by using a variable for the ID?
...answered Apr 13 '09 at 14:16
Rick HochstetlerRick Hochstetler
2,80322 gold badges1717 silver badges1616 bronze badges
...
Placing border inside of div and not on its edge
I have a <div> element and I want to put a border on it. I know I can write style="border: 1px solid black" , but this adds 2px to either side of the div, which is not what I want.
...
AngularJS: how to implement a simple file upload with multipart form?
...
A real working solution with no other dependencies than angularjs (tested with v.1.0.6)
html
<input type="file" name="file" onchange="angular.element(this).scope().uploadFile(this.files)"/>
Angularjs (1.0.6) not support ng-mo...