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Why would json_encode return an empty string
...is problem was setting charset=utf8 in my PDO connection.
$dbo = new PDO('mysql:host=localhost;dbname=yourdb;charset=utf8', $username, $password);
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How to stop a program running under Eclipse?
...r. For this you can open up the devices window (in the debug perspective), select the process and then press the stop button on the same window.
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Difference between datetime and timestamp in sqlserver? [duplicate]
..., MSDN points out that rowversion can be cheated to be non-unique by using SELECT INTO - although they point out that this is a bad idea. If you use it properly (i.e. let the database manage the rowversion value) then it will always be unique and monotonically increasing - which can be very handy.
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记一次数据库表自增长（Auto Increment）故障 - 数据库(内核) - 清泛网 - ...
...么我们不妨换个思路，显式设置唯一标识，比如说通过「SELECT MAX … FOR UPDATE」的方式直接查询得到唯一标识符，并在稍后执行的 INSERT 语句中显式设置。
不过这种方法不够透明，需要修改业务代码，更透明的方法是使用触发器...
How to change a nullable column to not nullable in a Rails migration?
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This worked for me. Using MySql locally. When pushed and ran app in Heroku (Postgres) it crapped on column that was not null when I was writing it a null - rightfully so. Only "change_column_null" would work could not use "change_column ... :null =>...
Setting environment variables via launchd.conf no longer works in OS X Yosemite/El Capitan/macOS Sie
... If the computer is restarted and "Reopen windows when logging back in" is selected, the reopened windows may not see the variables (Perhaps they are opened before the agent is run). Also, if you log in via ssh, the variables will not be set (so you'll need to set them in ~/.bash_profile). Finally, ...
MQTT与TCP的区别 - 创客硬件开发 - 清泛IT社区，为创新赋能！
... Maori dictionary)。10. mqtt客户端connect时，可以带有用户名和密码，用于验证客户端。服务端可以根据clientid、IP地址、用户名等进行ACL访问控制。可以通过自定义应用消息实现客户端对服务端的身份验证。11. 有商业和开源的mqtt broke...
Calendar Recurring/Repeating Events - Best Storage Method
... grabbing the events for the day it's at, the query would look like this:
SELECT EV.*
FROM `events` EV
RIGHT JOIN `events_meta` EM1 ON EM1.`event_id` = EV.`id`
RIGHT JOIN `events_meta` EM2 ON EM2.`meta_key` = CONCAT( 'repeat_interval_', EM1.`id` )
WHERE EM1.meta_key = 'repeat_start'
AND (
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Run a string as a command within a Bash script
...rameters so I ended up with something like:
my_exe ()
{
mysql -sN -e "select $1 from heat.stack where heat.stack.name=\"$2\";"
}
This is something I use to monitor openstack heat stack creation. In this case I expect two conditions, an action 'CREATE' and a status 'COMPLETE' on a stack named ...
Android Eclipse - Could not find *.apk
...is might help you out:
Right-click your app project and go to Properties
Select Android from left-hand side list
Uncheck the "Is Library" checkbox
If your app project relies on library projects which are in your workspace, those of course need to have the "Is Library" box checked.
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