大约有 41,000 项符合查询结果（耗时：0.0346秒） [XML]
How do I get the size of a java.sql.ResultSet?
...
Do a SELECT COUNT(*) FROM ... query instead.
OR
int size =0;
if (rs != null)
{
rs.last(); // moves cursor to the last row
size = rs.getRow(); // get row id
}
In either of the case, you won't have to loop over the enti...
Query to list number of records in each table in a database
...
If you're using SQL Server 2005 and up, you can also use this:
SELECT
t.NAME AS TableName,
i.name as indexName,
p.[Rows],
sum(a.total_pages) as TotalPages,
sum(a.used_pages) as UsedPages,
sum(a.data_pages) as DataPages,
(sum(a.total_pages) * 8) / 1024 as To...
LINQ Aggregate algorithm explained
...ggregate help readability? In general I love LINQ because I think .Where, .Select, .OrderBy and so on greatly helps readability (if you avoid inlined hierarhical .Selects). Aggregate has to be in Linq for completeness reasons but personally I am not so convinced that .Aggregate adds readability comp...
【精心整理】【实用】visual C++中最常用的类与API函数 - C/C++ - 清泛网 -...
...装了字体选择对话框
CGdiObject类：GDI绘图工具的基类
CIPAddressCtrl类：提供了IP地址控件的功能
CImageList类：管理大小相同的图标或位图集
CMenu类：封装应用程序菜单栏和弹出式菜单
CPen类：封装了Windows图形设备接口(GDI)中的...
How do I copy a folder from remote to local using scp? [closed]
...ound: the -C flag adds compression and the -c flag lets you pass in other cipher types for better performance, like scp -c blowfish a@b:something . as seen in dimuthu's answer
– Automatico
Jun 26 '14 at 20:48
...
How do I simulate a low bandwidth, high latency environment?
... instructions, you're enabling a firewall. For just simulating a different IP connection, you could (for example) do the following:
Create a file /etc/rc.firewall.56k which contains the following:
ipfw add pipe 1 ip from any to any out
ipfw add pipe 2 ip from any to any in
ipfw pipe 1 config b...
SELECT DISTINCT on one column
...ou're on SQL Server 2005 or greater, you can use a CTE with ROW_NUMBER():
SELECT *
FROM (SELECT ID, SKU, Product,
ROW_NUMBER() OVER (PARTITION BY PRODUCT ORDER BY ID) AS RowNumber
FROM MyTable
WHERE SKU LIKE 'FOO%') AS a
WHERE a.RowNumber = 1
...
Removing “NUL” characters
...id work was closely related:
Open your file in Notepad++
Type Control-A (select all)
Type Control-H (replace)
In 'Find What' type \x00
In 'Replace With' leave BLANK
In 'Search Mode' Selected 'Extended'
Then Click on 'Replace All'
...
Get hostname of current request in node.js Express
... be no way to detect the actual host without a request, you could have multiple hosts configured, but this is what I was looking for!
– Jesse
Sep 22 '11 at 0:38
2
...
Are HTTPS headers encrypted?
...ers.
That's why SSL on vhosts doesn't work too well - you need a dedicated IP address because the Host header is encrypted.
†The Server Name Identification (SNI) standard means that the hostname may not be encrypted if you're using TLS. Also, whether you're using SNI or not, the TCP and IP header...