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Why is prepared Statement, Callable Statement used for? What
is the need of Batch updates?
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Answer / chaitanya
The main feature of a PreparedStatement object is that,
unlike a Statement object, it is given an SQL statement
when it is created. The advantage to this is that in most
cases, this SQL statement is sent to the DBMS right away,
where it is compiled. As a result, the PreparedStatement
object contains not just an SQL statement, but an SQL
statement that has been precompiled. This means that when
the PreparedStatement is executed, the DBMS can just run
the PreparedStatement SQL statement without having to
compile it first.
Callable Statement:A CallableStatement object provides a
way to call stored procedures in a standard way for all
DBMSs. A stored procedure is stored in a database; the call
to the stored procedure is what a CallableStatement object
contains. This call is written in an escape syntax that may
take one of two forms: one form with a result parameter,
and the other without one. A result parameter, a kind of
OUT parameter, is the return value for the stored
procedure. Both forms may have a variable number of
parameters used for input (IN parameters), output (OUT
parameters), or both (INOUT parameters). A question mark
serves as a placeholder for a parameter
BatchUpdates:
A batch update is a set of multiple update statements that
is submitted to the database for processing as a batch.
Sending multiple update statements to the database together
as a unit can, in some situations, be much more efficient
than sending each update statement separately. This ability
to send updates as a unit, referred to as the batch update
facility, is one of the features provided with the JDBC 2.0
API.
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