In this example, a PreparedStatement object is obtained from a connection, and a ResultSet object is obtained from the PreparedStatement. The next method on the ResultSet returns true each time a subsequent row can be obtained. Values for the columns in the current row can then be obtained from the ResultSet object.
package ianywhere.ultralitej.demo;
import ianywhere.ultralitej.*;
/**
* ReadSeq -- sample program to demonstrate reading a Database table
* sequentially.
*/
public class ReadSeq
{
/**
* mainline for program.
*
* @param args command-line arguments
*
*/
public static void main
( String[] args )
{
try {
Configuration config = DatabaseManager.createConfigurationFile( "Demo1.ulj" );
Connection conn = DatabaseManager.connect( config );
PreparedStatement stmt = conn.prepareStatement( "SELECT * FROM Employee ORDER BY number" );
ResultSet cursor = stmt.executeQuery();
for( ; cursor.next(); ) {
/* Can't access columns by name because no meta data */
int emp_no = cursor.getInt( 1 /* "number" */ );
String last_name = cursor.getString( 2 /* "last_name" */ );
String first_name = cursor.getString( 3 /* "first_name" */ );
int age = cursor.getInt( 4 /* "age" */ );
Demo.display( first_name + ' ' + last_name );
Demo.display( " empl. no = "
, Integer.toString( emp_no )
, " age = "
, Integer.toString( age ) );
}
cursor.close();
stmt.close();
conn.release();
} catch( ULjException exc ) {
Demo.displayException( exc );
}
}
}
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