大约有 3,551 项符合查询结果（耗时：0.0177秒） [XML]
Many-to-many relationship with the same model in rails?
...t seen when simply accessing the associations from irb, and looking at the SQL that Rails generates in the log file. You'll find something like the following:
SELECT * FROM "posts"
INNER JOIN "post_connections" ON "posts".id = "post_connections".post_b_id
WHERE ("post_connections".post_a_id = 1 )
...
WCF timeout exception detailed investigation
...ize the objects you are returning. Specifically, if you are using Linq-To-Sql objects that have relationships, there are known serialization problems if you put a back reference on a child object to the parent object and mark that back reference as a DataMember.
You can verify serialization by wri...
How does “cat
I needed to write a script to enter multi-line input to a program ( psql ).
9 Answers
...
Is there a way to comment out markup in an .ASPX page?
...of places, including C#, VB, Javascript, and aspx pages; it also works for SQL in SQL Management Studio.
You can either select the text to be commented out, or you can position your text inside a chunk to be commented out; for example, put your cursor inside the opening tag of a GridView, press Ct...
select count(*) from table of mysql in php
I am able to get both the value and row of the mysql query result.
18 Answers
18
...
String.Join method that ignores empty strings?
...
To do it in .NET 2.0 (no LINQ), e.g. for SQL-Server ReportingServices without having to write a function for it:
VB.NET
Dim a As String = "", b As String = "b", c As String = "", d As String = "d", e As String = ""
Dim lala As String = String.Join(" / ", String.J...
Best practices for in-app database migration for Sqlite
I am using sqlite for my iphone and I anticipate the database schema might change over time. What are the gotchas, naming conventions and things to watch out for to do a successful migration each time?
...
generate days from date range
...portable technique that works with most databases with minor adjustments.
SQL Fiddle example returning 1,000 days
share
|
improve this answer
|
follow
|
...
Why unsigned integer is not available in PostgreSQL?
...s the difference between tinyint, smallint, mediumint, bigint and int in MySQL? ) and realized that PostgreSQL does not support unsigned integer.
...
Select rows which are not present in other table
I've got two postgresql tables:
4 Answers
4
...