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How to get UTF-8 working in Java webapps?
...ding=true&characterEncoding=UTF-8"
/>
MySQL database and tables
The used database must use UTF-8 encoding. This is achieved by creating the database with the following:
CREATE DATABASE `ID_development`
/*!40100 DEFAULT CHARACTER SET utf8 COLLATE utf8_swedish_ci */;
Then,...
Why does calling a method in my derived class call the base class method?
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You can imagine, that a class, when instantiated, is nothing more than a table of pointers, pointing to the actual implementation of its methods. The following image should visualize this pretty well:
Now there are different ways, a method can be defined. Each behaves different when it is used ...
Which annotation should I use: @IdClass or @EmbeddedId
...ingle property, and it permits the reuse of the @Embeddable class in other tables.
The next most natural approach is the use of the @EmbeddedId tag. Here, the primary key class cannot be used in other tables since it is not an @Embeddable entity, but it does allow us to treat the key as a
single a...
Python subprocess.Popen “OSError: [Errno 12] Cannot allocate memory”
...as originally asked here but the bounty time expired even though an acceptable answer was not actually found. I am re-asking this question including all details provided in the original question.
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How to write a simple database engine [closed]
...f it). I know most of the basic data structures taught in CS (trees, hash tables, lists, etc.) as well as a pretty good understanding of compiler theory (and have implemented a very simple interpreter) but I don't understand how to go about writing a database engine. I have searched for tutorials ...
The Role Manager feature has not been enabled
...thod will run just fine (if you haven't messed elsewhere) and create a few tables in your Database;
Press Ctrl+W+L to open the Server Explorer and you should be able to check in Data Connections > DefaultConnection > Tables the Roles and UsersInRoles tables among the newly created tables!
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DynamoDB vs MongoDB NoSQL [closed]
...can have multiple secondary global indexes. I'm doing queries on a single table with 4 possible filter parameters and sorting the results, this is supported (barely) through the use of the global secondary indexes with filter expressions. The problem comes in when you try to get the total results ...
Default implementation for Object.GetHashCode()
...d it is common to also provide ==/!=operators, and often to implement IEquatable<T> too.
For generating the hash code, it is common to use a factored sum, as this avoids collisions on paired values - for example, for a basic 2 field hash:
unchecked // disable overflow, for the unlikely possi...
Use variable with TOP in select statement in SQL Server without making it dynamic [duplicate]
...'s possible to use a variable in the top clause.
select top (@top) * from tablename
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On duplicate key ignore? [duplicate]
...).
Instead, since in your example tag is the unique key, use:
INSERT INTO table_tags (tag) VALUES ('tag_a'),('tab_b'),('tag_c') ON DUPLICATE KEY UPDATE tag=tag;
on duplicate key produces:
Query OK, 0 rows affected (0.07 sec)
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