kern/src/de/superx/applet/SxJDBCAdapter.java

// Beispielklasse aus dem JavaTutorial (http://java.sun.com/docs/books/tutorial) für SuperX angepasst 
/*
 * @(#)JDBCAdapter.java	1.5 97/12/03
 *
 * Copyright (c) 1997 Sun Microsystems, Inc. All Rights Reserved.
 *
 * This software is the confidential and proprietary information of Sun
 * Microsystems, Inc. ("Confidential Information").  You shall not
 * disclose such Confidential Information and shall use it only in
 * accordance with the terms of the license agreement you entered into
 * with Sun.
 *
 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
 * SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
 * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
 * THIS SOFTWARE OR ITS DERIVATIVES.
 *
 */

/**
 * An adaptor, transforming the JDBC interface to the TableModel interface.
 *
 * @version 1.20 09/25/97
 * @author Philip Milne
 */

package de.superx.applet;
import java.math.BigDecimal;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Timestamp;
import java.sql.Types;
import java.text.NumberFormat;
import java.text.ParseException;
import java.util.Properties;
import java.util.Vector;

import javax.swing.table.AbstractTableModel;

import de.superx.common.SuperX_el;


/**
 * Ein Adapter, der das JDBC-Interface an das TableModel-Interface anpasst.
 * Angepasst für SuperX
 * @autor Philip Milne, erweitert von R. Behr
 * @version 1.2
*/

public class SxJDBCAdapter extends AbstractTableModel implements SxTableModel {
    Connection          connection;
	Properties			db_props = null;
    boolean             isClosed = true;
    boolean             isEditable = false;
    Statement           statement = null;
    ResultSet           resultSet = null;
    String[]            columnNames = {}; 
    Class[]             columnTpyes = {}; 
    Vector				rows = new Vector();
    SxSQLMetaData   metaData;
   NumberFormat 		nf = NumberFormat.getInstance();
    //DecimalFormat df=(DecimalFormat) nf;
		
  /*  public SxJDBCAdapter(String url, String driverName,
                       String user, String passwd) throws Exception {
        try
		{
            Class.forName(driverName);
            System.err.println("Opening db connection");

	    	if (!isClosed)
		    {
				statement.close();
				connection.close ();
				isClosed = true;
		    }

			db_props = new Properties ();
			db_props.put ("user", user);
			db_props.put ("password", passwd);

		    connection = DriverManager.getConnection(url, db_props);
		    statement = connection.createStatement();
		    isClosed = false;
		}
        catch (Exception ex)
		{
	    	isClosed = true;
		    throw new SQLException (ex.toString());
        }    
     }*/

	public SxJDBCAdapter() {}

    public void executeQuery(String query) throws SQLException
	{ 
			resultSet = statement.executeQuery(query);
			// resultSet = statement.getResultSet();
			metaData = new SxSQLMetaData (new SuperX_el());
            //metaData = resultSet.getMetaData();

            int numberOfColumns =  metaData.getColumnCount(); 
            columnNames = new String[numberOfColumns]; 
            // Get the column names and cache them. 
            // Then we can close the connection. 
            for(int column = 0; column < numberOfColumns; column++)
			{
				columnNames[column] = metaData.getColumnLabel(column+1);
				// System.err.println ("Column: " + columnNames[column] + ", max width: " +
				//					metaData.getColumnDisplaySize(column+1));
            }

            // Get all rows.
            rows = new Vector();
            while (resultSet.next())
			{
                Vector newRow = new Vector();
				for (int i = 0; i < getColumnCount(); i++)
				{
					// newRow.addElement(dbRepresentation(i, resultSet.getObject(i + 1)));
		    		newRow.addElement(resultSet.getObject(i + 1));
				}
                rows.addElement(newRow);
            }
		    // close(); // Need to copy the metaData, bug in jdbc:odbc driver.
		    fireTableChanged(null); // Tell the listeners a new table has arrived.
   }

    public void cancel(String url, String user, String passwd) throws Exception
    {
		try
		{
        	System.err.println("Cancel statement");
			statement.cancel();
		}
		catch (Exception e)
		{
        	System.err.println("Error canceling statement: " + e);
		}
    }

    public void close() throws SQLException
    {
		try
		{
        	System.err.println("Closing db connection");
			if (!isClosed)
			{
				if (resultSet != null)
					resultSet.close();
				if (statement != null)
					statement.close();
				connection.close();
			    isClosed = true;
			}
		}
		catch (SQLException e)
		{
        	System.err.println("Error closing db connection: " + e);
		}
    }

    protected void finalize() throws Throwable
	{
		if (!isClosed)
		{
		    close();
		    isClosed = true;
		}
		super.finalize();
    }

    //////////////////////////////////////////////////////////////////////////
    //
    //             Implementation des TableModelInterface
    //
    //////////////////////////////////////////////////////////////////////////

    // MetaData

    public String getColumnName(int column) {
        if (columnNames[column] != null) { 
            return columnNames[column]; 
        } else { 
            return ""; 
        }
    }

    public int getColumnSize(int column)
	{
		if (metaData == null)
			return -1;

		return metaData.getColumnDisplaySize(column+1);
    }

    public Class getColumnClass(int column)
	{
        int type;

		if (metaData == null)
			return Object.class;

		type = metaData.getColumnType(column+1);

        switch(type)
		{
	        case Types.CHAR:
	        case Types.VARCHAR:
	        case Types.LONGVARCHAR:
	            return String.class;

	        case Types.BIT:
	            return Boolean.class;

			case Types.TINYINT:
			case Types.SMALLINT:
				return Short.class;

			case Types.INTEGER:
				return Integer.class;

			case Types.BIGINT:
				return Long.class;

			case Types.FLOAT:
			case Types.DOUBLE:
				return Double.class;

			case Types.DATE:
				return java.sql.Date.class;

			case Types.DECIMAL:
			case Types.NUMERIC:
				return java.math.BigDecimal.class;

			case Types.TIMESTAMP:
				return java.sql.Timestamp.class;

			default:
				return Object.class;
		}
	}

    public void setEditable(boolean editable)
	{ 
		isEditable = editable;
    }

	public boolean isCellEditable(int row, int column)
	{ 
		if (isEditable)
			return metaData.isWritable(column);
		else
			return false;
    }

    public int getColumnCount() {
        return columnNames.length; 
    }

    // Data methods

    public int getRowCount() {
        return rows.size();
    }

    public Object getValueAt(int aRow, int aColumn)
	{
        Vector row = (Vector)rows.elementAt(aRow);
    	Object value = row.elementAt(aColumn);
		return dbRepresentation(aColumn, value, true);
    }

    public Object getObjectAt(int aRow, int aColumn)
	{
        Vector row = (Vector)rows.elementAt(aRow);
    	return row.elementAt(aColumn);
    }

    private String dbRepresentation(int column, Object value, boolean isDecimalParsingWanted)
	{
        int type; 
		int scale;
		double db;
		String str;

		if (metaData == null)
			return value.toString();

		if (value == null||value.equals(""))
            return " "; 

		type = metaData.getColumnType(column+1);
		scale = metaData.getScale(column+1);

        switch(type)
		{
			case Types.SMALLINT:
				int	int_value = Short.MIN_VALUE;
				if (value instanceof Short)
					int_value = ((Short) value).shortValue();
				else
					if (value instanceof Integer)
						int_value = ((Integer) value).intValue();
				if (int_value == Short.MIN_VALUE)
					return (" ");
				return value.toString();
			case Types.INTEGER:
				if (!(value instanceof Integer))
					return value.toString();
				if (((Integer) value).intValue() == Integer.MIN_VALUE)
					return (" ");
				return value.toString();
			case Types.DOUBLE:
				if (isDecimalParsingWanted)
				{
				if (((Double) value).isNaN())
					return " ";
				nf.setMinimumFractionDigits(scale);	// r.b. Nachkommastellen setzen
				nf.setGroupingUsed(true);
				//df.setDecimalSeparatorAlwaysShown(true);
				//df.applyLocalizedPattern("#.#00,0#");
				if (scale > 3)
					nf.setMaximumFractionDigits(3);	// r.b. Nachkommastellen setzen
				return nf.format((Double) value);
				}
				else
				    return value.toString();
			case Types.DECIMAL:
			case Types.NUMERIC:
			    if (isDecimalParsingWanted)
                {
				db = ((BigDecimal) value).doubleValue();
				nf.setGroupingUsed(true);
				if (db == Double.NaN)
					return " ";
				//MB bigdecimal kann immer >65000 Nachkommastellen haben, wird immer auf 5 gesetzt
				//bei Studiabfragen nach Abschlüssen, ist wahrscheinlich ganz gut, dass ,00 verschwindet (wenngleich gewichtete Fälle)
				//bei Cob abfragen wäre schön
				//if (scale > 5)					nf.setMaximumFractionDigits(5);	// r.b. Nachkommastellen setzen
				//else					nf.setMinimumFractionDigits(scale);	// r.b. Nachkommastellen setzen
				//, einfach mal fest von 2 ausgehen
				nf.setMaximumFractionDigits(2);
				nf.setMinimumFractionDigits(2);
				//df.setDecimalSeparatorAlwaysShown(true);
				//df.applyLocalizedPattern("#.#00,0#");
				return nf.format(db);
                }
			    else
			        return value.toString();
			case Types.BIT:
				return ((Boolean)value).booleanValue() ? "1" : "0";
			case Types.DATE:
				str = SxDate.toString((java.sql.Date) value);
				if (str.length() == 0)
					return (" ");
				return str;
			case Types.TIMESTAMP:
				str = ((Timestamp) value).toString();
				if (str.length() == 0)
					return (" ");
				return str;
			default:
				if (value.toString().length() == 0)
					return (" ");
				return value.toString();
		}
    }

    private Object tableRepresentation(int column, Object value)
    {
        int type; 

		if (value == null)
		{
            return ""; 
        }

		if (metaData == null)
			return value;

		type = metaData.getColumnType(column+1);

		switch(type)
		{
			case Types.SMALLINT:
			{
				try
				{
					return new Short (value.toString());
				}
				catch (NumberFormatException e)
				{
					System.err.println ("tableRepresentation: ERROR: " + value.toString());
					return "";
				}
			}
			case Types.INTEGER:
			{
				try
				{
					return new Integer (value.toString());
				}
				catch (NumberFormatException e)
				{
					System.err.println ("tableRepresentation: ERROR: " + value.toString());
					return "";
				}
			}
			case Types.DOUBLE:
			case Types.FLOAT:
			{
				try
				{
					Number	new_number = nf.parse(value.toString());
					Double	new_double = new Double(new_number.doubleValue());
					return new_double;
				}
				catch (ParseException e)
				{
					System.err.println ("tableRepresentation: ERROR parse: Double=" + value.toString());
					return "";
				}
			}
			case Types.DECIMAL:
			{
				try
				{
					Number	new_number = nf.parse(value.toString());
					BigDecimal	new_dec = new BigDecimal(new_number.doubleValue());
					return new_dec;
				}
				catch (ParseException e)
				{
					System.err.println ("tableRepresentation: ERROR parse: BigDecimal=" + value.toString());
					return "";
				}
			}
			case Types.BIT:
				return new Boolean (value.toString());
			case Types.DATE:
				return SxDate.getDate(value.toString());
			case Types.TIMESTAMP:
				return Timestamp.valueOf(value.toString());
			default:
				return value;
        }

    }

    public void setValueAt(Object value, int row, int column)
	{
        try
		{
			String tableName = "info_usr"; // r.b. metaData.getTableName(column+1);
			// Some of the drivers seem buggy, tableName should not be null.
			if (tableName == null)
			{ 
				System.err.println("Table name returned null."); 
            }
			String colName = getColumnName(column);

			Object new_value = tableRepresentation(column, value);
			if (new_value == null)
				throw new SQLException ("conversion error");

			System.err.println ("column: " + colName + ", value: " + new_value);
			String query = 
                "update "+tableName+
				" set "+colName+" = " + "'" + dbRepresentation(column, new_value, true) + "'" +
				" where ";
			// We don't have a model of the schema so we don't know the 
			// primary keys or which columns to lock on. To demonstrate 
			// that editing is possible, we'll just lock on everything.  
			for(int col = 0; col<getColumnCount(); col++)
			{
                String columnName = getColumnName(col);
                if (columnName.equals(""))
                    continue; 
                if (col != 0)
                    query = query + " and "; 
				query = query + columnName + " = " + "'" + getValueAt(row, col) + "'";
            }

            System.err.println(query); 
            System.err.println("Sending update to database"); 
		    int rc = 1; // statement.executeUpdate(query);
		    if (rc == 1)
		    {
				System.err.println("Update succeeded");
		    }
		    else
				throw new SQLException ("Update failed: " + rc);

		    Vector dataRow = (Vector)rows.elementAt(row);
		    dataRow.setElementAt(new_value, column);

		}
		catch (SQLException e)
		{
	    	System.err.println("ERROR: " + e);
		}

    }

    public void setDataVector(Vector Rows, Vector Header, Object Meta)
	{
		int numberOfColumns = Header.size();
		columnNames = new String[numberOfColumns]; 
		rows = Rows;
		if (Meta instanceof SxSQLMetaData)
		{
			metaData = (SxSQLMetaData) Meta;
            // Get the column names and cache them. 
            for(int column = 0; column < numberOfColumns; column++)
				columnNames[column] = (String) Header.elementAt (column);
		}
		else
			metaData = null;
	    fireTableChanged(null); 
	}

    public void setDataVector(Vector Rows)
	{
		rows = Rows;

	    fireTableDataChanged();
	}
    /**
     * MB 04/2010 hinzugefügt, weil felderinfo decimal nicht funktioniert,
     * aufruf von TSxDlgManager für col1 darf bei dbrepresenation kein , sondern . enthalten
     * 
     */
    public Object getValueAt2(int aRow, int aColumn)
    {
        Vector row = (Vector)rows.elementAt(aRow);
        Object value = row.elementAt(aColumn);
        return dbRepresentation(aColumn, value, false);
    }
}