JDBC(Java Database Connectivity)

The JDBC library includes APIs for performing following tasks commonly associated with database usage:

•     Making a connection to a database
•     Creating SQL or MySQL statements
•     Executing that SQL or MySQL queries in the database
•     Viewing & Modifying the resulting records

The JDBC API provides the following interfaces and classes:

• DriverManager: This class manages a list of database drivers. Matches connection requests from the java application with the proper database driver using communication subprotocol. The first driver that recognizes a certain subprotocol under JDBC will be used to establish a database Connection.
• Driver: This interface handles the communications with the database server. You will interact directly with Driver objects very rarely. Instead, you use DriverManager objects, which manages objects of this type. It also abstracts the details associated with working with Driver objects
• Connection : This interface with all methods for contacting a database. The connection object represents communication context, i.e., all communication with database is through connection object only.
• Statement : You use objects created from this interface to submit the SQL statements to the database. Some derived interfaces accept parameters in addition to executing stored procedures.
• ResultSet: These objects hold data retrieved from a database after you execute an SQL query using Statement objects. It acts as an iterator to allow you to move through its data.
• SQLException: This class handles any errors that occur in a database application.

JDBC connections support creating and executing statements. These may be update statements such as SQL's CREATE, INSERT, UPDATE and DELETE, or they may be query statements such as SELECT. Additionally, stored procedures may be invoked through a JDBC connection. JDBC represents statements using one of the following classes:

• Statement – the statement is sent to the database server each and every time.
• PreparedStatement – the statement is cached and then the execution path is pre-determined on the database server allowing it to be executed multiple times in an efficient manner.
• CallableStatement – used for executing stored procedures on the database.

5 Steps to connect to the database in java |DriverManager class | Connection interface | Statement interface |

ResultSet interface | Connectivity with Oracle using JDBC|Connectivity with MySQL using JDBC |

Connectivity with Access without DSN



Visit My Blog: http://vinay-kumar-saini.blogspot.in/