The document discusses three types of SQL exceptions in Java: SQLException, SQLWarning, and DataTruncation. SQLException is thrown for SQL errors and connectivity issues. SQLWarning provides information on database access warnings. DataTruncation is thrown or reported when a data value is unexpectedly truncated for reasons other than exceeding the maximum field size.

1. Exceptions
java.sql.SQLException

2. • public class SQLException extends Exception
implements Iterable<Throwable>
• {
• }

3. Exceptions that are thrown by JDBC
• 1. SQL Exception
• 2. SQLWarning
• 3. DataTruncation

4. SQLException
• The SQL syntax error that are found in the user given query are reflected
by the SQLException.
• This exception is thrown by many of the java.sql package methods.
• The connectivity issues with the database and the coding errors such has
trying to access a closed object give rise to such exceptions.
• The details of SQL error or a null are returned by using the
getNetException() method of the SQLException object and the vendorspecific error codes are retrieved by using the getErrorCode() method of
the SQLException object.

5. SQLWarning
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Import java.sql.SQLWarning;
public class SQLWarning extends SQLException
{
}
An exception that provides information on database access warnings.
Warnings are silently chained to the object whose method caused it to be
reported.
• Warnings may be retrieved from Connection, Statement,
and ResultSet objects. Trying to retrieve a warning on a connection after it
has been closed will cause an exception to be thrown. Similarly, trying to
retrieve a warning on a statement after it has been closed or on a result
set after it has been closed will cause an exception to be thrown. Note
that closing a statement also closes a result set that it might have
produced.

6. DataTruncation
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java.sql.DataTruncation
public class DataTruncationextends SQLWarning
{
}
An exception thrown as a DataTruncation exception (on writes) or
reported as a DataTruncation warning (on reads) when a data values is
unexpectedly truncated for reasons other than its having
execeeded MaxFieldSize.
• The SQLstate for a DataTruncation during read is 01004.
• The SQLstate for a DataTruncation during write is 22001.