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JDBC drivers created by DBMS manufacturers have to: Open a connection between the DBMS and the J2ME application Translate low-level equivalents of SQL statements sent by the J2ME application into messages that can be processed by the DBMS Return data that conforms to the JDBC specification to the JDBC driver Return information, such as error messages, that conforms to the JDBC specification to the JDBC driver Provide transaction management routines that conform to the JDBC specification Close the connection between the DBMS and the J2ME application The JDBC driver makes J2ME applications database independent, which complements Java s philosophy of platform independence Today, JDBC drivers for nearly every commercial DBMS are available from the Sun web site (wwwsuncom) or the DBMS manufacturers web sites Java code independence is also extended to implementation of SQL queries SQL queries are passed from the JDBC API through the JDBC driver to the DBMS without validation This means it is the responsibility of the DBMS to implement SQL statements contained in the query
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The JDBC driver specification classifies JDBC drivers into four groups Each group is referred to as a JDBC driver type and addresses a specific need for communicating with various DBMSs The JDBC driver types are described in the following sections
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Microsoft was the first company to devise a way to create DBMS-independent database programs when they created Open Database Connectivity (ODBC) ODBC is the basis from which Sun created JDBC Both ODBC and JDBC have similar driver specifications and an API The JDBC to ODBC driver, also called the JDBC/ODBC Bridge, is used to translate DBMS calls between the JDBC specification and the ODBC specification The JDBC to ODBC driver receives messages from a J2ME application that conforms to the JDBC specification, as discussed previously in this chapter Those messages are translated by the JDBC to ODBC driver into the ODBC message format, which is then translated into the message format understood by the DBMS However, avoid using the JDBC/ODBC Bridge in a mission-critical application because the extra translation might negatively impact performance
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The Java/Native Code driver uses Java classes to generate platform-specific code that is, code only understood by a specific DBMS The manufacturer of the DBMS provides both the Java/Native Code driver and API classes so the J2ME application can generate the platform-specific code The obvious disadvantage of using a Java/ Native Code driver is the loss of some portability of code The API classes for the Java/Native Code driver probably won t work with another manufacturer s DBMS
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Type 3 JDBC Driver
The Type 3 JDBC driver, also referred to as the Java Protocol, is the most commonly used JDBC driver The Type 3 JDBC driver converts SQL queries into JDBC-formatted statements The JDBC-formatted statements are translated into the format required by the DBMS
Type 4 JDBC Driver
The Type 4 JDBC driver is also known as the Type 4 Database Protocol This driver is similar to the Type 3 JDBC driver, except SQL queries are translated into the format required by the DBMS SQL queries do not need to be converted to JDBC-formatted systems This is the fastest way to communicate SQL queries to the DBMS
JDBC Packages
The JDBC API is contained in two packages The first package is called javasql and contains core JDBC interfaces of the JDBC API These include the JDBC interfaces that provide the basics for connecting to the DBMS and interacting with data stored in the DBMS javasql is part of the J2SE The other package that contains the JDBC API is javaxsql, which extends javasql and is in the J2ME Included in the javaxsql package is the JDBC interface that interacts with Java Naming and Directory Interface (JNDI) and the JDBC interface that manages connection pooling, among other advanced JDBC features
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