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Efficient SQL test query or validation query that will work across all (or most) databases
...ir SQL connections for idleness. For example, the JDBC pooling library c3p0 has a property called preferredTestQuery , which gets executed on the connection at configured intervals. Similarly, Apache Commons DBCP has validationQuery .
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Uploading both data and files in one form using Ajax?
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记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...的速度下降了，同时PHP抛出异常：
cursor timed out (timeout: 30000, time left: 0:0, status: 0)
我一时判断不出问题所在，想想先在PHP脚本里加大Timeout的值应付一下：
<?php
MongoCursor::$timeout = -1;
?>
可惜这样并没有解决问题，错误反倒...
How to calculate number of days between two given dates?
If I have two dates (ex. '8/18/2008' and '9/26/2008' ), what is the best way to get the number of days between these two dates?
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Using Enums while parsing JSON with GSON
...m.out.println(element.delimiter);
System.out.println(element.scope.get(0));
}
}
class AttributeScopeDeserializer implements JsonDeserializer<AttributeScope>
{
@Override
public AttributeScope deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
throws...
Jasmine JavaScript Testing - toBe vs toEqual
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504
For primitive types (e.g. numbers, booleans, strings, etc.), there is no difference between toB...
How do I pass multiple parameters into a function in PowerShell?
...ses are entirely unneccessary and will cause a parse error in PowerShell 2.0 (or later) if Set-StrictMode is active. Parenthesised arguments are used in .NET methods only.
function foo($a, $b, $c) {
"a: $a; b: $b; c: $c"
}
ps> foo 1 2 3
a: 1; b: 2; c: 3
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Macro vs Function in C
...ategy for fixing this is to put the statements inside a "do { ... } while (0)" loop.
If you have two structures that happen to contain a field with the same name but different semantics, the same macro might work on both, with strange results:
struct shirt
{
int numButtons;
};
struct webpage...
Add x and y labels to a pandas plot
... that object.
ax = df2.plot(lw=2, colormap='jet', marker='.', markersize=10, title='Video streaming dropout by category')
ax.set_xlabel("x label")
ax.set_ylabel("y label")
Or, more succinctly: ax.set(xlabel="x label", ylabel="y label").
Alternatively, the index x-axis label is automatically se...
Alarm Manager Example
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This is working code. It wakes CPU every 10 minutes until the phone turns off.
Add to Manifest.xml:
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<uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission>
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<receiver android:process=":remote" android:name=".Alarm">&...