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CHAPTER 5 JDBC 4.0
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error code, accessible from the getErrorCode() method. These methods are still there and can be used; but in addition to these methods, there are now subclasses specific to common SQL states. There are also two new categories for SQL exceptions: transient and nontransient. These are represented by the new SQLTransientException and SQLNonTransientException classes. Transient exceptions are those that when retried could succeed without changing anything. These exceptions include the following subclasses: SQLTimeoutException: Expired statement timeout SQLTransactionRollbackException: Database rolled back statement automatically, possibly due to deadlock (SQLState 40) SQLTransientConnectionException: Communication layer problem (SQLState 08) Nontransient exceptions are those that will fail again on retry until the underlying cause of the problem is corrected. There are six subclasses of SQLNonTransientException: SQLDataException: Data error, such as an invalid argument (SQLState 22) SQLFeatureNotSupportedException: JDBC driver doesn t support feature (SQLState 0A) SQLIntegrityConstraintViolationException: Constraint on a key was violated (SQLState 23) SQLInvalidAuthorizationSpecException: Invalid authorization credentials presented during connection (SQLState 28) SQLNonTransientConnectionException: Communication layer problem that cannot be corrected (SQLState 08) SQLSyntaxErrorException: Query violated SQL syntax (SQLState 42) In some cases, such as SQLFeatureNotSupportedException, the fix for the problem is to get a new database driver, not to necessarily change anything in code. The connection exception can be transient or nontransient, depending upon what the problem is hence the shared SQLState value of 08.
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BLOBs and CLOBs can be fun. They represent binary and character large objects stored in the database system. Prior to JDBC 4.0, there were some areas of the API that could lead to some ambiguity. Changes in Mustang fix these. For instance, instead of having to call setCharacterStream(int parameterIndex, Reader reader, int length) on a PreparedStatement and letting the system possibly incorrectly determine whether the
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CHAPTER 5 JDBC 4.0
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column was a LONGVARCHAR or a CLOB, you can now explicitly call setClob(int parameterIndex, Reader reader, long length). Other changes include the following methods for creating empty objects in the Connection interface: createBlob(), createClob(), and createNClob(). In addition, methods were added to the Blob/Clob interfaces for freeing the object and fetching pieces of it. Lastly, we can t forget the new NClob interface. This works like the Blob and Clob interfaces when working with result sets, callable statements, and prepared statements.
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Connection and Statement Interface Enhancements
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The Connection and Statement interfaces are important in the world of JDBC. For Connection, an instance of the interface still describes a database session. Statement is still a SQL statement to get a ResultSet. You can now do just a little bit more with both. The Connection interface has two significant changes, covered by five methods. The first change has to do with checking whether a connection hasn t been closed and is still valid. You can now do that with the new isValid() method.
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public boolean isValid(int timeout)
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The timeout here represents the number of seconds to wait for a reply. If no reply is acquired during this time, false is returned and the caller is unblocked. A timeout value of 0 means it will wait forever. The other new feature of Connection is the ability to query for and set the connection s client info properties. This is a Properties object and works much the same as the System class does with system properties. The getter methods return all the properties, or that for one particular name. public Properties getClientInfo() public String getClientInfo(String name) The setter methods go in the opposite direction. The first version allows you to set multiple name/value pairs simultaneously. public void setClientInfo(Properties props) public void setClientInfo(String name, String value) That isn t quite it yet for client info properties. You can actually ask the
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DatabaseMetaData for the set of properties supported, via its getClientInfoProperties()
method. This method returns a sorted ResultSet by name, not just a list of names. For each property, you can get its name, maximum length, default value, and a description of the property.
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