Servlet context | Servlet config |
It is an Object to be shared by all servlets and JSPs. | this object is associated to specific servlet |
unlimited store of data as per as server capability | limited support for data handling |
can be used to collaboration between multiple servlet. | It is for single servlet |
Data stored here can be access from any servlet and JSP | Data stored here can be access from the servlet for which this object is associated |
It is created using getServletContext() method of Servlet class | Created using getServletConfig() method |
Only Single instance available within web application | Multiple instances for each servlet. |
contains global properties like classpath, context path etc | Only contains property related to specific servlet. |
HSQLDB is a portable RDBMS implemented in pure java. It can be embedded with your application as well as can be used separately. It is very a small database that supports almost all features of the standard database system. It comes with small jar file that can be found in lib folder. The HSQLDB jar package is located in the /lib directory of the ZIP package and contains several components and programs. Core components of jar file are : HyperSQL RDBMS Engine (HSQLDB), HyperSQL JDBC Driver, Database Manager, and Sql Tool. Installing and Using Download: download latest release of HyperSQL database from http://hsqldb.org website and extract it. You will see following contents. Here "bin" directory contains some batch files those can be used to run a swing based GUI tool. You can use runManagerSwing.bat to connect to database, but database must be on before running it. Directory lib contains File hsqldb.jar . It is the database to be used by you. Running database First ...
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