大约有 44,000 项符合查询结果（耗时：0.0486秒） [XML]
Ruby on Rails generates model field:type - what are the options for field:type?
I'm trying to generate a new model and forget the syntax for referencing another model's ID. I'd look it up myself, but I haven't figured out, among all my Ruby on Rails documentation links, how to find the definitive source.
...
In MySQL queries, why use join instead of where?
...
Any query involving more than one table requires some form of association to link the results from table "A" to table "B". The traditional (ANSI-89) means of doing this is to:
List the tables involved in a comma separated list in the FROM clause
Write the association betwee...
Android: install .apk programmatically [duplicate]
...Activity(intent);
That is correct now, my auto-update is working. Thanks for help. =)
Edit 20.7.2016:
After a long time, I had to use this way of updating again in another project. I encountered a number of problems with old solution. A lot of things have changed in that time, so I had to do th...
Hide options in a select list using jQuery
...
For what it's worth, the second form (with the @) doesn't exist in jQuery 1.3. The first isn't working because you're apparently expecting variable interpolation. Try this:
$("#edit-field-service-sub-cat-value option[value...
How can I get column names from a table in Oracle?
...ase to get the column names , not to be confused with data in the table. For example, if I have a table named EVENT_LOG that contains eventID , eventType , eventDesc , and eventTime , then I would want to retrieve those field names from the query and nothing else.
...
Oracle Differences between NVL and Coalesce
... of ANSI-92 standard.
NVL is Oracle specific, it was introduced in 80's before there were any standards.
In case of two values, they are synonyms.
However, they are implemented differently.
NVL always evaluates both arguments, while COALESCE usually stops evaluation whenever it finds the first n...
Why do some websites add “Slugs” to the end of URLs? [closed]
...
Xian, I've heard that argument before, but I don't think it stands up to scrutiny. Apart from geeks, hardly anyone really types URLs directly. Readability is definitely important, and I think a growing number of users see the URLs, but when it comes to "gues...
Sass .scss: Nesting and multiple classes?
I'm using Sass (.scss) for my current project.
3 Answers
3
...
How to parse a JSON string into JsonNode in Jackson?
It should be so simple, but I just cannot find it after being trying for an hour #embarrasing.
6 Answers
...
How does database indexing work? [closed]
...re structured in much the same way as linked lists; both contain a section for data, a pointer to the location of the next node (or block), and both need not be stored contiguously.
Due to the fact that a number of records can only be sorted on one field, we can state that searching on a field that...