大约有 1,900 项符合查询结果（耗时：0.0178秒） [XML]
LEFT OUTER JOIN in LINQ
... in categories
join p in products on c.Category equals p.Category into ps
from p in ps.DefaultIfEmpty()
select new { Category = c, ProductName = p == null ? "(No products)" : p.ProductName };
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Using “like” wildcard in prepared statement
..., "!%")
.replace("_", "!_")
.replace("[", "![");
PreparedStatement pstmt = con.prepareStatement(
"SELECT * FROM analysis WHERE notes LIKE ? ESCAPE '!'");
pstmt.setString(1, notes + "%");
or a suffix-match:
pstmt.setString(1, "%" + notes);
or a global match:
pstmt.setString(1, "...
What does inverse_of do? What SQL does it generate?
...gnment against non existing or invalid entries with validates_presence of :user_id, :role_id, it is useful. You can still generate a User @user with his association @user.role(params[:role_id]) so that saving the user would not result in a failing validation of the Assignment model.
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How to make PowerShell tab completion work like Bash
...
New versions of PowerShell include PSReadline, which can be used to do this:
Set-PSReadlineKeyHandler -Key Tab -Function Complete
To make it permanent, put this command into C:\Users\[User]\Documents\WindowsPowerShell\profile.ps1.
...
How to run an EXE file in PowerShell with parameters with spaces and quotes
...es the string, that is, it typically echos it to the screen, for example:
PS> "Hello World"
Hello World
If you want PowerShell to interpret the string as a command name then use the call operator (&) like so:
PS> & 'C:\Program Files\IIS\Microsoft Web Deploy\msdeploy.exe'
After th...
How to find out which processes are using swap space in Linux?
... When using the ? key you can see the actual program name and version, procps-ng being the latest version. This is a fork by Debian, Fedora and openSUSE: gitorious.org/procps . If you would still like to do a sort on the SWAP column: Use the 'f' key to see the fields, use the arrow keys to go t...
Find what filetype is loaded in vim
...cpp'
setlocal noexpandtab
endif
& syntax works for all options: https://vi.stackexchange.com/questions/2569/how-do-i-check-the-value-of-a-vim-option-in-vimscript
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How to convert TimeStamp to Date in Java?
...y to pass those integers to our SQL code defined above.
PreparedStatement ps = con.prepareStatement( sql );
ps.setObject( 1 , start ) ;
ps.setObject( 2 , stop ) ;
ResultSet rs = ps.executeQuery();
When you retrieve your integer values from the ResultSet, you can transform into Instant objects (al...
converting CSV/XLS to JSON? [closed]
...
This worked perfectly for me and does NOT require a file upload:
https://github.com/cparker15/csv-to-json?files=1
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How to show particular image as thumbnail while implementing share on Facebook?
... type of page
The URL
The websites name
A description of the page
Facebook user_id's of administrators of the page ( on facebook )
Here is an example ( taken from the facebook documentation ) of some og:tags
<meta property="og:title" content="The Rock"/>
<meta property="og:type" content=...