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Transaction isolation levels relation with locks on table
...B just executes a SELECT statement to read data. C reads and updates data. All these process work on the same table T.
READ UNCOMMITTED - no lock on the table. You can read data in the table while writing on it. This means A writes data (uncommitted) and B can read this uncommitted data and use it...
Draw a perfect circle from user's touch
...;
g.drawOval(cX, cY, cD, cD);
}else{
g.drawString("Uknown",30,50);
}
}
private Type getType(int dx, int dy) {
Type result = Type.UNDEFINED;
if (dx > 0 && dy < 0) {
result = Type.RIGHT_DOWN;
} else if...
Wait until file is unlocked in .NET
...;
/// <param name="fullPath"></param>
bool WaitForFile(string fullPath)
{
int numTries = 0;
while (true)
{
++numTries;
try
{
// Attempt to open the file exclusively.
using (FileStream ...
再说WCF Data Contract KnownTypeAttribute - 更多技术 - 清泛网移动版 - 专注C/C++及内核技术
... {
......
}
[DataMember]
public string AddressCategory { get; set; }
[DataMember]
public string AddressTitle { get; set; }
[DataMember]
public string AddressDetail { get; set; }
}
[DataContract]
pu...
MySQL combine two columns into one column
... The SQL standard provides the CONCAT() function to concatenate two strings into a single string. SQLite, however, does not support the CONCAT() function. Instead, it uses the concatenate operator (||) to join two strings into one.
– PaulH
Oct 28 '19 at ...
C# switch on type [duplicate]
...something along these lines could help
// nasty..
switch(MyObj.GetType.ToString()){
case "Type1": etc
}
// clumsy...
if myObj is Type1 then
if myObj is Type2 then
etc.
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How to determine whether a Pandas Column contains a particular value
...e found.count() will contains number of matches
And if it is 0 then means string was not found in the Column.
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How to create a temporary directory/folder in Java?
...tion
{
final File temp;
temp = File.createTempFile("temp", Long.toString(System.nanoTime()));
if(!(temp.delete()))
{
throw new IOException("Could not delete temp file: " + temp.getAbsolutePath());
}
if(!(temp.mkdir()))
{
throw new IOException("Could not...
jQuery access input hidden value
...@Html.HiddenFor(m => m.SomeBoolean).)
Then the following will return a string 'False', not a JS boolean!
var notABool = $('#SomeBoolean').val();
If you want to use the boolean for some logic, use the following instead:
var aBool = $('#SomeBoolean').val() === 'True';
if (aBool) { /* ...*/ }
...
Further understanding setRetainInstance(true)
...tribute with a unique ID.
Supply the android:tag attribute with a unique string.
If you provide neither of the previous two, the system uses the ID of the container view.
This strongly implies that if you do setContentView(R.layout.whatever) in Activity.onCreated() and that layout contains ...