大约有 6,100 项符合查询结果（耗时：0.0268秒） [XML]
What is the default height of UITableViewCell?
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tableView.rowHeight
– Hunter
Sep 21 '11 at 3:14
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Best way to test SQL queries [closed]
...endently tested to find errors, and the tests are simple.
Here's the base table in the example:
create table month_value(
eid int not null, month int, year int, value int );
This table is flawed, because it uses two columns, month and year, to represent one datum, an absolute month. Here's...
Django dump data for a single model?
...Django dumpdata management command allows you to dump data from individual tables:
./manage.py dumpdata myapp1 myapp2.my_model
You can also separate multiple apps and models on the command line. Here's the canonical definition:
django-admin dumpdata [app_label[.ModelName] [app_label[.ModelName] ...
Why do people hate SQL cursors so much? [closed]
...I. Cursors are how parts of the RDBMS work under the hood. Often CREATE TABLE and INSERT have SELECT statements, and the implementation is the obvious internal cursor implementation.
Using higher-level "set-based operators" bundles the cursor results into a single result set, meaning less API b...
Differences between MySQL and SQL Server [closed]
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I can't believe that no one mentioned that MySQL doesn't support Common Table Expressions (CTE) / "with" statements. It's a pretty annoying difference.
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Why can't C# interfaces contain fields?
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The virtual keyword is implemented in .NET with methods and a so-called v-table, an array of method pointers. The override keyword fills the v-table slot with a different method pointer, overwriting the one produced by the base class. Properties, events and indexers are implemented as methods und...
Datatable vs Dataset
I currently use a DataTable to get results from a database which I can use in my code.
7 Answers
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Query to list all stored procedures
...m my understanding the "preferred" method is to use the information_schema tables:
select *
from information_schema.routines
where routine_type = 'PROCEDURE'
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Accessing an SQLite Database in Swift
...en it is no longer required.
Use sqlite3_exec to perform SQL (e.g. create table).
if sqlite3_exec(db, "create table if not exists test (id integer primary key autoincrement, name text)", nil, nil, nil) != SQLITE_OK {
let errmsg = String(cString: sqlite3_errmsg(db)!)
print("error creating t...
how to show alternate image if source image is not found? (onerror working in IE but not in mozilla)
I need to show an alternate image in cell of table if source image is not found.
Currently below code is used to do so.
3 A...