Posted on 2008-06-04 16:04
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官方：
eg：xquery使用
import org.basex.core.Commands;
import org.basex.core.proc.Proc;
import org.basex.data.Result;
import org.basex.io.ConsoleOutput;
import org.basex.query.QueryException;
import org.basex.query.QueryProcessor;
import org.basex.query.xquery.XQueryProcessor;
/**
* This class serves an example for executing XQuery requests.
*/
public final class XQueryExample {
/** Sample query. */
private static final String XMLFILE = XPathExample.class.getClassLoader().getSystemResource(
"xx.xml"
).getPath();
private static final String QUERY = " for $x in doc('"+XMLFILE+"')//property " +
" return <child>{data($x/@name)}</child>";
/** Private constructor. */
private XQueryExample() { }
/**
* Main method of the example class.
* @param args (ignored) command-line arguments
* @throws Exception exception
*/
public static void main(final String[] args) throws Exception {
// FIRST EXAMPLE:
System.out.println("First example:");
// create standard output stream
final ConsoleOutput out = new ConsoleOutput(System.out);
// Create a BaseX process
final Proc proc = Proc.get(Commands.XQUERY, QUERY);
// launch process
if(proc.execute()) {
// successful execution: print result
proc.output(out);
} else {
// execution failed: print result
proc.info(out);
}
out.flush();
System.out.println();
// SECOND EXAMPLE (ALTERNATIVE):
System.out.println("Second example:");
// Execute XQuery request
try {
// create query instance
final QueryProcessor xquery = new XQueryProcessor(QUERY);
// execute query; no initial context set is specified (null)
final Result result = xquery.query(null);
// print output
result.serialize(out, false);
out.println();
} catch(final QueryException e) {
// dump stack trace
e.printStackTrace();
}
// close output stream
out.close();
}
}
结果：
First example:
<child>connection.datasource</child>
<child>dialect</child>
<child>show_sql</child>
<child>hibernate.cache.provider_class</child>
<child>cache.use_query_cache</child>
Second example:
<child>connection.datasource</child>
<child>dialect</child>
<child>show_sql</child>
<child>hibernate.cache.provider_class</child>
<child>cache.use_query_cache</child>
数据来源：xx.xml
<?xml version='1.0' encoding='utf-8'?>
<hibernate-configuration>
<session-factory>
<property name="connection.datasource">java:comp/env/jdbc/USERPORTAL1</property>
<property name="dialect">org.hibernate.dialect.MySQLInnoDBDialect</property>
<property name="show_sql">true</property>
<property name="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</property>
<property name="cache.use_query_cache">true</property>
<!-- JDBC connection pool (use the built-in) -->
</session-factory>
</hibernate-configuration>