Driver is an interface defined in java.sql package. Implementation will be provided by the respective vendors of the database.
Implementation of Driver will include how to communicate/connect with the database, how to pass data to and from database to java program and vise-versa etc.,
If you are using DriverManager to manage your connection objects, you need to load the Driver in to the memory. That�s why you execute the statement Class.forName(�Driver Name�);When you load any driver, it will register itself with the DriverManager.
DriverManager is a class in which getConnection is a static method which helps to achieve connectivity with corresponding database mentioned within it.
Connection , an interface in java.sql, provides methods for 3 type of SQL queries - 1. creatStatement - for simple query- return type is Statement interface 2.prepareStatement -for prepared query - retrun type is PreparedStatement Interface 3. prepareCall - for stored procedure and function - return type is CallableStatement
Statement , an Interface in java.sql , provides 3 types of methods again -1. executeQuery - return type ResultSet - for database query (select statements) 2. executeUpdate - return type int(no. of rows updated) - for insert ,update , delete operation of databese 3. execute - return type is boolean - true if ResultSet is returned and false if no. of Updated rows is returned - used for all type of database operation .
ResultSet ,an Interface in java.sql. , provides few methods like getMetaData() .
Please let me know whether your doubts are clear or not .
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