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What is the purpose of the reader monad?
...nstance Functor (Reader env) where
fmap f (Reader g) = Reader $ f . g
Now, to get a monad:
instance Monad (Reader env) where
return x = Reader (\_ -> x)
(Reader f) >>= g = Reader $ \x -> runReader (g (f x)) x
which is not so scary. ask is really simple:
ask = Reader $ \x -...
Linux下部署企业级邮件服务器(postfix + dovecot + extmail) - 开源 & Gith...
...权限
mysql> GRANT all privileges on extmail.* TO extmail@localhost IDENTIFIED BY 'extmail';
Query OK, 0 rows affected (0.00 sec)
mysql> GRANT all privileges on extmail.* TO extmail@127.0.0.1 IDENTIFIED BY 'extmail';
Query OK, 0 rows affected (0.00 sec)
3、安装配置apache
yum install ...
How to select an option from drop down using Selenium WebDriver C#?
...nt, you need to include the Selenium Webdriver Support package which is a different NuGet package than the Selenium WebDriver. Include the namespace OpenQA.Selenium.Support.UI.
– James Lawruk
May 28 '13 at 19:33
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How can I remove all my changes in my SVN working directory?
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if you also want to remove ignored files- svn cleanup . --remove-ignored
– Kip
Feb 22 '19 at 13:39
a...
Extract only right most n letters from a string
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This aproach does not work correctly if the string is not as long as the number of characters required.
– stevehipwell
Nov 12 '09 at 13:59
1
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Tools to generate database tables diagram with Postgresql? [closed]
...dbc3.jar -s public -noads
Sometimes using options -port will not working if your database has diferrent port, so you have to add manual port after host parameter, for example:
java -jar schemaspy-6.0.0-rc2.jar -t pgsql -db database_name -host myhost:myport -u username -p password -o ./schemaspy -...
Entity Framework Refresh context?
...entities in your context is to dispose your context and create a new one.
If you really need to refresh some entity and you are using Code First approach with DbContext class, you can use
public static void ReloadEntity<TEntity>(
this DbContext context,
TEntity entity)
...
PHP - Get bool to echo false when false
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echo $bool_val ? 'true' : 'false';
Or if you only want output when it's false:
echo !$bool_val ? 'false' : '';
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What does Java option -Xmx stand for? [duplicate]
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see here: Java Tool Doc, it says,
-Xmxn
Specify the maximum size, in bytes, of the memory allocation pool. This value must a multiple of 1024 greater than 2MB. Append the letter k or K to indicate kilobytes, or m or M to indicate megabytes. The default value is 64MB. T...
Import CSV to SQLite
...v foo
The first command creates the column names for the table. However, if you want the column names inherited from the csv file, you might just ignore the first line.
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