Interface connection
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The Connection interface represents a session with a specific database. It allows SQL statements to be executed and results returned within the context of the connection. A Connection object can provide metadata about the database tables, SQL grammar, stored procedures, and capabilities. It has a createStatement() method that returns a Statement object used to send and execute queries in the backend database. Statement objects are typically used for executing SQL statements without parameters.
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Interface connection
- 2. public interface Connectionextends Wrapper { }
- 3. • A connection (session) with a specific database. SQL statements are executed and results are returned within the context of a connection. • A Connection object's database is able to provide information describing its tables, its supported SQL grammar, its stored procedures, the capabilities of this connection, and so on. This information is obtained with the getMetaData method.
- 4. createStatement() Statement createStatement() throws SQLException { } • This is used to create a Sql object. An sql object is used to send and execute the query in backend database. • Creates a Statement object for sending SQL statements to the database. SQL statements without parameters are normally executed using Statement objects. • If the same SQL statement is executed many times, it may be more efficient to use a PreparedStatement object. • Result sets created using the returned Statement object will by default be type TYPE_FORWARD_ONLY and have a concurrency level of CONCUR_READ_ONLY. The holdability of the created result sets can be determined by calling getHoldability(). • Returns:a new default Statement object