It’s common to handle structured text files in Java programming. But since Java lacks corresponding class library, code produced through hardcoding is complicated and difficult to maintain.
For example, sales.txt is a tab-separated structured text file that needs sorting by SellerId. Here’s the code:
2016-04-18 443 0
Programmers can handle structured data using SQL statements when the data is stored in a single database. But they can’t use SQL statements directly when the data is held in a non-database such as the file, the NoSQL database, or the Json data stream, or when multiple databases are involved. As an alternative, programm...
2016-04-06 633 0
SQL is a sophisticated and all-around database programming language, making most instances of structured-data computing a painless experience. Yet there are still some instances that are difficult to handle in SQL in computer programming.
Here’s an example. duty is a MySQL table of shift schedule, in which an employee ...
2016-03-16 386 0
There are many different types of report data sources, including relational databases, NoSQL databases, local files, HDFS files and JSON data stream. It’s easy to build a report with a single data source, but it’s difficult to build one that needs data from more than one type of data source, i.e. heterogeneous data sou...
2016-03-15 276 0
A reporting architecture consists of three layers from bottom to top – storage layer, computing layer and displaying layer. The storage layer contains raw data, which may be stored in a relational database (RDB), a NoSQL database, and a local or HDFS file, or may just be a JSON stream. The computing layer can access th...
2016-03-07 298 0