Type 1 driver


JDBC-ODBC bridge

The Java Software bridge provides JDBC access via ODBC drivers. Note that you need to load ODBC binary code onto each client machine that uses this driver. As a result, the ODBC driver is most appropriate on a corporate network where client installations are not a major problem, or for application server code written in Java in a three-tier architecture.

This combination provides JDBC access via ODBC drivers. ODBC binary code--and in many cases, database client code--must be loaded on each client machine that uses a JDBC-ODBC Bridge. A product called SequeLink from Data Direct Technologies provides a driver that supports some ODBC drivers.

● Pros: A good approach for learning JDBC. May be useful for companies that already have ODBC drivers installed on each client machine-typically the case for Windows-based machines running productivity applications. May be the only way to gain access to some low-end desktop databases.

● Cons: Not for large-scale applications. Performance suffers because there's some overhead associated with the translation work to go from JDBC to ODBC. Doesn't support all the features of Java. User is limited by the functionality of the underlying ODBC driver.



JDBC/ODBC bridge

A JDBC/ODBC bridge provides JDBC API access through one or more ODBC drivers. Some ODBC native code and in many cases native database client code must be loaded on each client machine that uses this type of driver.

Drivers are uniquely different in what they do and the type of functions they support. The JDBC/ODBC Adapter allows you to pick and choose which driver is best suited for your application environment. There can be significant differences and limitations between drivers. The performance and functionality of the JDBC/ODBC Adapter depends on the selected driver.

The JDBC type 1 driver, also known as the JDBC-ODBC bridge, is a database driver implementation that employs the ODBC driver to connect to the database. The driver converts JDBC method calls into ODBC function calls.

The driver is platform-dependent as it makes use of ODBC which in turn depends on native libraries of the underlying operating system the JVM is running upon. Also, use of this driver leads to other installation dependencies; for example, ODBC must be installed on the computer having the driver and the database must support an ODBC driver.

The use of this driver is discouraged if the alternative of a pure-Java driver is available.

This technology isn't suitable for a high-transaction environment. Type 1 drivers also don't support the complete Java command set and are limited by the functionality of the ODBC driver.

Sun (now Oracle) provided a JDBC-ODBC Bridge driver

sun.jdbc.odbc.JdbcOdbcDriver.

This driver is native code and not Java, and is closed source. Sun's/Oracle's JDBC-ODBC Bridge was removed in Java 8

If a driver has been written so that loading it causes an instance to be created and also calls


DriverManager.registerDriver

with that instance as the parameter (as it should do), then it is in the DriverManager's list of drivers and available for creating a connection.


It may sometimes be the case that more than one JDBC driver is capable of connecting to a given URL. For example, when connecting to a given remote database, it might be possible to use a JDBC-ODBC bridge driver, a JDBC-to-generic-network-protocol driver, or a driver supplied by the database vendor. In such cases, the order in which the drivers are tested is significant because the DriverManager will use the first driver it finds that can successfully connect to the given URL.

First the DriverManager tries to use each driver in the order it was registered. (The drivers listed in jdbc.drivers are always registered first.) It will skip any drivers that are untrusted code unless they have been loaded from the same source as the code that is trying to open the connection.
It tests the drivers by calling the method Driver.connect on each one in turn, passing them the URL that the user originally passed to the method DriverManager.getConnection. The first driver that recognizes the URL makes the connection.

Advantages

Almost any database for which an ODBC driver is installed can be accessed, and data can be retrieved.


Disadvantages

● Performance overhead since the calls have to go through the JDBC bridge to the ODBC driver, then to the native database connectivity interface (thus may be slower than other types of drivers).
● The ODBC driver needs to be installed on the client machine.
● Not suitable for applets, because the ODBC driver needs to be installed on the client.
● Specific ODBC drivers are not always available on all platforms; hence, portability of this driver is limited.
● No support from JDK 1.8 (Java 8).

References : wikipedia oracle « Privious Post » « Next Post » share on :        :  

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