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On the other hand, the JDBC-ODBC bridge offers several significant advantages Because JSP pages aren t operating in the applet environment, they have none of these limitations ODBC is widely supported, so using the bridge makes possible accessing a wide variety of existing systems for which data sources are already configured Likewise, ODBC-enabled database products, such as Microsoft Access and FoxBase, are widely available These features make the JDBC-ODBC bridge a good choice for low-volume Web applications and a useful tool for learning JDBC To use the JDBC-ODBC bridge in a Java application, a suitable ODBC data source must be configured On Windows systems, this is done through the Control Panel ODBC Data Sources application The data source should be configured as a System DSN, not a User DSN, because the JSP engine is typically running under a system user profile The driver class name is sunjdbcodbcJdbcOdbcDriver if the Sun JVM is being used or commsjdbcodbcJdbcOdbcDriver for the Microsoft virtual machine The database URL used in the getConnection() statement is jdbc:odbc:dsn, where dsn is the data source name Microsoft supplies ODBC drivers for its Access database product, as well as dBase, Excel, FoxPro, and a number of others, including a text driver that can use ordinary text files (txt and csv) as a simple database system

For a JDBC driver to be used, it must first be registered with the driver manager You can accomplish this in several ways, but each involves calling DriverManagerregisterDriver() The most common approach is simply to load the driver class:

try { ClassforName("MyJdbcDriver"); } catch (ClassNotFoundException e) { // Report the exception }

A driver class loaded in this fashion should create an instance of itself and register it with the driver manager, using logic similar to the following:

static { PrintStream log = DriverManagergetLogStream(); if (log != null) logprintln("MyJdbcDriver class loaded"); MyJdbcDriver driver = new MyJdbcDriver(); try { DriverManagerregisterDriver(driver); }

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two streams meeting and forming a river The short-term buy signal con rmed the intermediate-term trend shift, and the market accelerated higher before being stopped by the force of the resistance powered by the long-term, or primary, trend When we view our charts, we always want the proper amount of time visible to use in making our decisions The preferred amount of time is as follows: Monthly chart Weekly chart Daily chart 240-minute chart 60-minute chart 15-minute chart 5-minute chart 7 years 25 years 8 months 15 months 10 days 28 hours 8 hours

catch (SQLException e) { if (log != null) logprintln("Unable to register driver"); } }

Some older drivers have been known to omit this step, doing the registration in their constructor instead In that case, creating an instance of the driver is necessary, using the following method5:

try { ClassforName("MyJdbcDriver"); } catch (ClassNotFoundException e) { // Report the exception } catch (InstantiationException e) { // Report the exception } catch (IllegalAccessException e) { // Report the exception }

Another approach to driver registration is to put the driver name in the jdbcdrivers system property This is a colon-delimited list of driver class names, which DriverManager loads during its initialization For example, a standalone Java application that uses this approach might be invoked as follows:

Some JDBC driver vendors, notably Oracle, recommend explicitly creating an instance of the driver and registering it with the driver manager:

DriverManagerregisterDriver( new oraclejdbcdriverOracleDriver());

JDBC 20 allows connections to be made through a DataSource object that is registered with a JNDI service provider JRun 30, for example, provides a means for defining JDBC data sources at the Web server level, as well as a quick online test

5 A tedious workaround, isn t it You could simply catch Exception itself, but that always leaves you open to applying the wrong logic to exceptions you didn t anticipate

13:

for connectivity The advantage of this approach is driver class names and database URL s are stored in the naming service, rather than being hard coded in application programs Only the data source name is required The sample JSP page associated with Figure 13-3 earlier in this chapter could have its connection logic replaced with the following:

InitialContext ctx = new InitialContext(); DataSource ds = (DataSource) ctxlookup ("java:comp/env/jdbc/lyricnote_internal"); Connection con = null; try { con = dsgetConnection(); } finally { if (con != null) conclose(); }

JSP pages using a DataSource for JDBC connections must import javaxsql* and javaxnaming* or else fully qualify the references to InitialContext and DataSource Another advantage of using a DataSource is other advanced database features like connection pooling and distributed transactions can be implemented entirely with changes to bindings in the naming service No changes to the JSP source code are required

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