Connection

A Connection object represents a connection with a database. A connection session includes the SQL statements that are executed and the results that are returned over that connection. A single application can have one or more connections with a single database, or it can have connections with many different databases. The Connection interface is a factory of Statement, PreparedStatement, and DatabaseMetaData i.e. object of Connection can be used to get the object of Statement and DatabaseMetaData. The Connection interface provide many methods for transaction management like commit(), rollback() etc.

Commonly used methods of Connection interface:

1.   public Statement createStatement(): creates a statement object           that can be used to execute SQL queries.

2.   public Statement createStatement(int resultSetType,int                     resultSetConcurrency): Creates a Statement object that will generate   ResultSet objects with the given type and concurrency.

3.   public void setAutoCommit(boolean status): is used to set the commit  status.By default it is true.

4.   public void commit(): saves the changes made since the previous commit/rollback permanent.

5.   public void rollback(): Drops all changes made since the previous commit/rollback.

6.   public void close(): closes the connection and Releases a JDBC resources immediately.