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How do you create a random string that's suitable for a session ID in PostgreSQL?
...---------------------
202ed325-b8b1-477f-8494-02475973a28f
May be worth reading the docs on UUID too
The data type uuid stores Universally Unique Identifiers (UUID) as defined by RFC 4122, ISO/IEC 9834-8:2005, and related standards. (Some systems refer to this data type as a globally unique i...
How to Disable landscape mode in Android?
... type in the landscape softkeyboard on their phones, and many tablet users read in portrait - and you should let them).
If you still need to force portrait for some reason, sensorPortrait may be better than portrait for Android 2.3+; this allows for upside-down portrait, which is quite common in tab...
What is the difference between properties and attributes in HTML?
...roperty is a reflected property for the id attribute: Getting the property reads the attribute value, and setting the property writes the attribute value. id is a pure reflected property, it doesn't modify or limit the value.
The type property is a reflected property for the type attribute: Getting ...
What is the difference between ExecuteScalar, ExecuteReader and ExecuteNonQuery?
...the first row. An example might be SELECT @@IDENTITY AS 'Identity'.
ExecuteReader is used for any result set with multiple rows/columns (e.g., SELECT col1, col2 from sometable).
ExecuteNonQuery is typically used for SQL statements without results (e.g., UPDATE, INSERT, etc.).
...
How to fix java.net.SocketException: Broken pipe?
...aused by:
most usually, writing to a connection when the other end has already closed it;
less usually, the peer closing the connection without reading all the data that is already pending at his end.
So in both cases you have a poorly defined or implemented application protocol.
There is a thi...
How to remove all null elements from a ArrayList or String Array?
...
Try:
tourists.removeAll(Collections.singleton(null));
Read the Java API. The code will throw java.lang.UnsupportedOperationException for immutable lists (such as created with Arrays.asList); see this answer for more details.
...
What is a lambda (function)?
...e way as anonymous delegates, but it can also be broken down and its logic read.
For instance (in C#3):
LinqToSqlContext.Where(
row => row.FieldName > 15 );
LinqToSql can read that function (x > 15) and convert it to the actual SQL to execute using expression trees.
The statement ...
Why should I use Hamcrest-Matcher and assertThat() instead of traditional assertXXX()-Methods
...alue", "anotherValue"));
One can discuss which one of those is easier to read, but once the assert fails, you'll get a good error message from assertThat, but only a very minimal amount of information from assertTrue.
assertThat will tell you what the assertion was and what you got instead. asser...
MySQL vs PostgreSQL for Web Applications [closed]
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A note to future readers: The text below was last edited in August 2008. That's nearly 11 years ago as of this edit. Software can change rapidly from version to version, so before you go choosing a DBMS based on the advice below, do some rese...
What's the difference between the 'ref' and 'out' keywords?
...
The ref modifier means that:
The value is already set and
The method can read and modify it.
The out modifier means that:
The Value isn't set and can't be read by the method until it is set.
The method must set it before returning. ...