viewquerybean.java

一个applet servlet之间通过序列化对象通讯的例子

package espc;

import java.io.PrintStream;
import java.sql.*;

// Referenced classes of package gzcims.netsell:
//            DbConnection

public class ViewQueryBean
{

    DbConnection dc;
    ResultSet rset;

    public ViewQueryBean()
    {
        dc = null;
        rset = null;
        dc = new DbConnection();
    }

    public boolean openConnection()
    {
        System.out.println("OPEN CONNECTION!!!");
        return dc.openConnection();
    }

    public void executeQuery(String query)
        throws SQLException
    {
        rset = dc.executeQuery(query);
        System.out.println("Execute Query!!!");
    }

    public void executeUpdate(String query)
        throws SQLException
    {
        dc.executeUpdate(query);
    }

    public int getColumnCount(int index)
        throws SQLException
    {
        ResultSetMetaData rsmd = rset.getMetaData();
        return rsmd.getColumnCount();
    }

    public String getColumnName(int index)
        throws SQLException
    {
        ResultSetMetaData rsmd = rset.getMetaData();
        return rsmd.getColumnName(index);
    }

    public String getData(int index)
        throws SQLException
    {
        String returnValue = rset.getString(index);
        if(rset.wasNull())
            return "Null";
        else
            return rset.getString(index).trim();
    }

    public String getData(String columnName)
        throws SQLException
    {
        String returnValue = rset.getString(columnName);
        if(rset.wasNull())
            return "Null";
        else
            return rset.getString(columnName).trim();
    }

    public String getString(int index)
        throws SQLException
    {
        String returnValue = rset.getString(index);
        if(rset.wasNull())
            return "Null";
        else
            return rset.getString(index).trim();
    }

    public int getInt(int index)
        throws SQLException
    {
        String returnValue = rset.getString(index);
        if(rset.wasNull())
            return 0;
        else
            return rset.getInt(index);
    }

    public String getString(String columnName)
        throws SQLException
    {
        String returnValue = rset.getString(columnName);
        if(rset.wasNull())
            return "Null";
        else
            return rset.getString(columnName).trim();
    }

    public float getFloat(String columnName)
        throws SQLException
    {
        float returnValue = rset.getFloat(columnName);
        if(rset.wasNull())
            return 0.0F;
        else
            return rset.getFloat(columnName);
    }

    public int getInt(String columnName)
        throws SQLException
    {
        float returnValue = rset.getFloat(columnName);
        if(rset.wasNull())
            return 0;
        else
            return rset.getInt(columnName);
    }

    public boolean next()
        throws SQLException
    {
        return rset.next();
    }

    public boolean first()
        throws SQLException
    {
        return rset.first();
    }

    public boolean last()
        throws SQLException
    {
        return rset.last();
    }

    public boolean absolute(int intRow)
        throws SQLException
    {
        return rset.absolute(intRow);
    }

    public int getNumber()
        throws SQLException
    {
        rset.last();
        int returnNumber = -rset.getRow();
        return returnNumber;
    }

    public void close()
        throws SQLException
    {
        System.out.println("CLOSE CONNECTION!!!");
        if(rset != null)
            rset.close();
        if(dc != null)
            dc.close();
    }

    protected void finalize()
        throws Throwable
    {
        close();
    }
}