HSQLDB example source code file (ZaurusTableForm.java)
The HSQLDB ZaurusTableForm.java source code/* Copyright (c) 2001-2008, The HSQL Development Group
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the HSQL Development Group nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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package org.hsqldb.util;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Vector;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.Label;
import java.awt.Panel;
import java.awt.ScrollPane;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.TextEvent;
import java.awt.event.TextListener;
/**
* Class declaration
*
*
* @author ulrivo@users
* @version 1.0.0
*/
// an entry panel to input/edit a record of a sql table
// ZaurusTableForm is constructed with a tableName and a connection
public class ZaurusTableForm extends ScrollPane
implements TextListener, ItemListener, ActionListener {
// connection to database - brought via the constructor
Connection cConn;
DatabaseMetaData dbmeta;
// the name of table for the form
String tableName;
// array holding the components (TextField or Choice) in the GUI
ZaurusComponent[] komponente;
// the columns of the table
String[] columns;
// and their types
short[] columnTypes;
// the names of the primary keys of the table
String[] primaryKeys;
// the position of the primary keys in the table i. e. the column index starting from 0
int[] pkColIndex;
// the names of the imported/foreign keys of the table
// first dimension is running through the constraints, second dim through the keys of one constraint
String[][] importedKeys;
// the position of the imported keys in the table i. e. the column index starting from 0
int[][] imColIndex;
// the names of the tables and columns which are the reference for the imported keys
String[] refTables;
String[][] refColumns;
// the position of the reference keys in the reference table i. e. the column index starting from 0
int[][] refColIndex;
// an array holding array of primary keys values matching the search condition
// first dimension through the results, second dimension running through the primary keys
Object[][] resultRowPKs;
// there is an explicit count because a delete may shrink the result rows
int numberOfResult;
// prepared statement to fetch the required rows
PreparedStatement pStmt;
// pointer into the resultRowPKs
int aktRowNr;
public ZaurusTableForm(String name, Connection con) {
super();
tableName = name;
cConn = con;
this.fetchColumns();
this.fetchPrimaryKeys();
// System.out.print("primaryKeys: ");
// for (int i=0; i<primaryKeys.length;i++) {
// System.out.print(primaryKeys[i]+", ");
// } // end of for (int i=0; i<primaryKeys.length;i++)
// System.out.println();
this.fetchImportedKeys();
this.initGUI();
}
// cancel the change/update of a row - show the row again
public void cancelChanges() {
this.showAktRow();
}
// delete current row, answer special action codes, see comment below
public int deleteRow() {
// build the delete string
String deleteString = "DELETE FROM " + tableName
+ this.generatePKWhere();
PreparedStatement ps = null;
// System.out.println("delete string "+deleteString);
try {
// fill the question marks
ps = cConn.prepareStatement(deleteString);
ps.clearParameters();
int i;
for (int j = 0; j < primaryKeys.length; j++) {
ps.setObject(j + 1, resultRowPKs[aktRowNr][j]);
} // end of for (int i=0; i<primaryKeys.length; i++)
ps.executeUpdate();
} catch (SQLException e) {
ZaurusEditor.printStatus("SQL Exception: " + e.getMessage());
return 0;
} finally {
try {
if (ps != null) {
ps.close();
}
} catch (SQLException e) {}
}
// delete the corresponding primary key values from resultRowPKs
numberOfResult--;
for (int i = aktRowNr; i < numberOfResult; i++) {
for (int j = 0; j < primaryKeys.length; j++) {
resultRowPKs[i][j] = resultRowPKs[i + 1][j];
}
}
// there are the following outcomes after deleting aktRowNr:
/*
A B C D E F
no rows left J N N N N N
one row left - J N J N N
deleted row was the last row - J J N N N
deleted row was the pre-last - - - - J N
first D X + D + *
. D X X D D
. D X +
last X
new numberOfResult 0 1 2 1 2 2
old aktRowNr 0 1 2 0 1 0
D - deleted row
X - any one row
+ - one or more rows
* - zero or more rows
*/
// A. return to the search panel and tell 'last row deleted' on the status line
// B. show the previous row and disable previous button
// C. show the previous row as akt row
// D. show akt row and disable next button
// E. show akt row and disable next button
// F. show akt row
// these actions reduce to the following actions for ZaurusEditor:
// 1. show search panel
// 2. disable previous button
// 3. disable next button
// 4. do nothing
// and 1,2,3,4 are the possible return codes
int actionCode;
if (numberOfResult == 0) {
// case A
actionCode = 1;
ZaurusEditor.printStatus("Last row was deleted.");
return actionCode;
} else if (numberOfResult == aktRowNr) {
// B or C
// new aktRow is previous row
aktRowNr--;
if (aktRowNr == 0) {
// B
actionCode = 2;
} else {
// C
actionCode = 4;
} // end of if (aktRowNr == 0)
} else {
// D, E, F
if (numberOfResult >= 2 && aktRowNr < numberOfResult - 1) {
// F
actionCode = 4;
} else {
actionCode = 3;
} // end of else
}
this.showAktRow();
ZaurusEditor.printStatus("Row was deleted.");
return actionCode;
}
// answer a String containing a String list of primary keys i. e. "pk1, pk2, pk3"
public String getPrimaryKeysString() {
String result = "";
for (int i = 0; i < primaryKeys.length; i++) {
if (result != "") {
result += ", ";
}
result += primaryKeys[i];
} // end of for (int i=0; i<primaryKeys.length; i++)
return result;
}
// open the panel to insert a new row into the table
public void insertNewRow() {
// reset all fields
for (int i = 0; i < komponente.length; i++) {
komponente[i].clearContent();
} // end of for (int i=0; i<komponente.length; i++)
// reset the field for the primary keys
for (int i = 0; i < primaryKeys.length; i++) {
komponente[pkColIndex[i]].setEditable(true);
}
ZaurusEditor.printStatus("enter a new row for table " + tableName);
}
// show next row
// answer true, if there is after the next row another row
public boolean nextRow() {
if (aktRowNr + 1 == numberOfResult) {
return false;
}
aktRowNr++;
this.showAktRow();
return (aktRowNr + 1 < numberOfResult);
}
// show prev row
// answer true, if there is previous the previous row another row
public boolean prevRow() {
if (aktRowNr == 0) {
return false;
}
aktRowNr--;
this.showAktRow();
return (aktRowNr > 0);
}
// save all changes which are be made in the textfelder to the database
// answer true, if the update succeeds
public boolean saveChanges() {
// the initial settings of the textfields counts with one
// so a real change by the user needs as many changes as there are columns
// System.out.print("Anderungen in den Feldern: ");
// there are changes to the database
// memorize all columns which have been changed
int[] changedColumns = new int[columns.length];
int countChanged = 0;
// build the update string
String updateString = "";
for (int i = 0; i < columns.length; i++) {
if (komponente[i].hasChanged()) {
if (updateString != "") {
updateString += ", ";
}
updateString += columns[i] + "=?";
changedColumns[countChanged++] = i;
}
} // end of for (int i=0; i<columns.length; i++)
if (countChanged > 0) {
updateString = "UPDATE " + tableName + " SET " + updateString
+ this.generatePKWhere();
PreparedStatement ps = null;
// System.out.println("update "+updateString);
try {
// fill the question marks
ps = cConn.prepareStatement(updateString);
ps.clearParameters();
int i;
for (i = 0; i < countChanged; i++) {
ps.setObject(i + 1,
komponente[changedColumns[i]].getContent());
// System.out.print(" changed feld "+komponente[changedColumns[i]].getContent());
} // end of for (int i=0; i<countChanged; i++)
// System.out.println();
for (int j = 0; j < primaryKeys.length; j++) {
ps.setObject(i + j + 1, resultRowPKs[aktRowNr][j]);
} // end of for (int i=0; i<primaryKeys.length; i++)
ps.executeUpdate();
ZaurusEditor.printStatus("changed row was saved to table "
+ tableName);
return true;
} catch (SQLException e) {
ZaurusEditor.printStatus("SQL Exception: " + e.getMessage());
return false;
} finally {
try {
if (ps != null) {
ps.close();
}
} catch (SQLException e) {}
}
} else {
// System.out.println("no changes");
return true;
} // end of if (changed)
}
// save a new row
// answer true, if saving succeeds
public boolean saveNewRow() {
// check the fields of the primary keys whether one is empty
boolean onePKempty = false;
int tmp;
PreparedStatement ps = null;
for (tmp = 0; tmp < primaryKeys.length; tmp++) {
if (komponente[pkColIndex[tmp]].getContent().equals("")) {
onePKempty = true;
break;
}
}
if (onePKempty) {
komponente[pkColIndex[tmp]].requestFocus();
ZaurusEditor.printStatus("no value for primary key "
+ primaryKeys[tmp]);
return false;
} // end of if (onePKempty)
// build the insert string
String insertString = "INSERT INTO " + tableName + " VALUES(";
for (int j = 0; j < columns.length; j++) {
if (j > 0) {
insertString += ", ";
}
insertString += "?";
} // end of for (int i=0; i<columns.length; i++)
insertString += ")";
// System.out.println("insert string "+insertString);
try {
// fill the question marks
ps = cConn.prepareStatement(insertString);
ps.clearParameters();
int i;
for (i = 0; i < columns.length; i++) {
ps.setObject(i + 1, komponente[i].getContent());
}
ps.executeUpdate();
ZaurusEditor.printStatus("new row was saved to table "
+ tableName);
return true;
} catch (SQLException e) {
ZaurusEditor.printStatus("SQL Exception: " + e.getMessage());
return false;
} finally {
try {
if (ps != null) {
ps.close();
}
} catch (SQLException e) {}
}
}
// read all primary key values into resultRowPKs for the rows which meet the search condition i. e.
// which contains the search words
// answer the number of found rows, -1 if there is an SQL exception
public int searchRows(String[] words, boolean allWords,
boolean ignoreCase, boolean noMatchWhole) {
// System.out.print("search in " + tableName + " for: ");
// for (int i=0; i < words.length; i++) {
// System.out.print(words[i]+", ");
// }
// System.out.println("allWords = "+allWords+", ignoreCase = "+ignoreCase+", noMatchWhole= "+noMatchWhole);
String where = this.generateWhere(words, allWords, ignoreCase,
noMatchWhole);
Vector temp = new Vector(20);
Statement stmt = null;
try {
stmt = cConn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT "
+ this.getPrimaryKeysString()
+ " FROM " + tableName + where);
while (rs.next()) {
Object[] pkValues = new Object[primaryKeys.length];
for (int i = 0; i < primaryKeys.length; i++) {
pkValues[i] = rs.getObject(pkColIndex[i] + 1);
} // end of for (int i=0; i<primaryKeys.length; i++)
temp.addElement(pkValues);
}
rs.close();
} catch (SQLException e) {
ZaurusEditor.printStatus("SQL Exception: " + e.getMessage());
return -1;
} finally {
try {
if (stmt != null) {
stmt.close();
}
} catch (SQLException e) {}
}
resultRowPKs = new Object[temp.size()][primaryKeys.length];
numberOfResult = temp.size();
for (int i = 0; i < primaryKeys.length; i++) {
for (int j = 0; j < temp.size(); j++) {
resultRowPKs[j][i] = ((Object[]) temp.elementAt(j))[i];
} // end of for (int j=0; j<temp.size(); j++)
} // end of for (int i=0; i<primaryKeys.length; i++)
// prepare statement for fetching the result rows for later use
String stmtString = "SELECT * FROM " + tableName;
try {
pStmt = cConn.prepareStatement(stmtString
+ this.generatePKWhere());
} catch (SQLException e) {
System.out.println("SQL Exception: " + e.getMessage());
} // end of try-catch
// System.out.println("prepared statement: "+stmtString);
if (numberOfResult > 0) {
this.disablePKFields();
aktRowNr = 0;
this.showAktRow();
} // end of if (numberOfResult > 0)
// System.out.println("number of rows: "+numberOfResult);
return numberOfResult;
}
public void actionPerformed(ActionEvent e) {}
public void textValueChanged(TextEvent e) {
for (int i = 0; i < columns.length; i++) {
if (komponente[i] == e.getSource()) {
komponente[i].setChanged();
break;
}
}
}
public void itemStateChanged(ItemEvent e) {
for (int i = 0; i < columns.length; i++) {
if (komponente[i] == e.getSource()) {
komponente[i].setChanged();
break;
}
}
}
// ******************************************************
// private methods
// ******************************************************
// set all fields for primary keys to not editable
private void disablePKFields() {
for (int i = 0; i < primaryKeys.length; i++) {
komponente[pkColIndex[i]].setEditable(false);
} // end of for (int i=0; i<columns.length; i++)
}
// fetch all values from a table and a column
// fill the ZaurusChoice zc with the row values for the Choice
// and the column values as values
private void fillZChoice(ZaurusChoice zc, String tab, String col) {
Statement stmt = null;
try {
if (cConn == null) {
return;
}
stmt = cConn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM " + tab
+ " ORDER BY " + col);
ResultSetMetaData rsmd = rs.getMetaData();
int numberOfColumns = rsmd.getColumnCount();
int colIndex = rs.findColumn(col);
while (rs.next()) {
String tmp = "";
for (int i = 1; i <= numberOfColumns; i++) {
if (i > 1) {
tmp += "; ";
}
tmp += rs.getString(i);
} // end of for (int i=1; i<=numberOfColumns; i++)
zc.add(tmp, rs.getString(colIndex));
}
rs.close();
} catch (SQLException e) {
System.out.println("SQL Exception: " + e.getMessage());
} finally {
try {
if (stmt != null) {
stmt.close();
}
} catch (SQLException e) {}
}
}
// fetch all column names
private void fetchColumns() {
Vector temp = new Vector(20);
Vector tempType = new Vector(20);
try {
if (cConn == null) {
return;
}
if (dbmeta == null) {
dbmeta = cConn.getMetaData();
}
ResultSet colList = dbmeta.getColumns(null, null, tableName, "%");
while (colList.next()) {
temp.addElement(colList.getString("COLUMN_NAME"));
tempType.addElement(new Short(colList.getShort("DATA_TYPE")));
}
colList.close();
} catch (SQLException e) {
ZaurusEditor.printStatus("SQL Exception: " + e.getMessage());
}
columns = new String[temp.size()];
temp.copyInto(columns);
columnTypes = new short[temp.size()];
for (int i = 0; i < columnTypes.length; i++) {
columnTypes[i] = ((Short) tempType.elementAt(i)).shortValue();
}
}
// fetch the imported keys i.e. columns which reference to foreign keys in other tables
private void fetchImportedKeys() {
Vector imKeys = new Vector(20);
Vector imKeyNames = null;
Vector refTabs = new Vector(20);
Vector refCols = new Vector(20);
Vector refColNames = null;
try {
if (cConn == null) {
return;
}
if (dbmeta == null) {
dbmeta = cConn.getMetaData();
}
ResultSet colList = dbmeta.getImportedKeys(null, null, tableName);
String pkTable, pkColumn, fkColumn;
int keySeq;
while (colList.next()) {
pkTable = colList.getString("PKTABLE_NAME");
pkColumn = colList.getString("PKCOLUMN_NAME");
fkColumn = colList.getString("FKCOLUMN_NAME");
keySeq = colList.getInt("KEY_SEQ");
if (keySeq == 1) {
if (imKeyNames != null) {
imKeys.addElement(imKeyNames);
refCols.addElement(refColNames);
} // end of if (exKeyNames != null)
imKeyNames = new Vector(20);
refColNames = new Vector(20);
refTabs.addElement(pkTable);
} // end of if (keySeq == 1)
imKeyNames.addElement(fkColumn);
refColNames.addElement(pkColumn);
}
if (imKeyNames != null) {
imKeys.addElement(imKeyNames);
refCols.addElement(refColNames);
} // end of if (exKeyNames != null)
colList.close();
} catch (SQLException e) {
ZaurusEditor.printStatus("SQL Exception: " + e.getMessage());
}
// System.out.println("Imported Keys of "+tableName);
int numberOfConstraints = imKeys.size();
importedKeys = new String[numberOfConstraints][];
imColIndex = new int[numberOfConstraints][];
refTables = new String[numberOfConstraints];
refColumns = new String[numberOfConstraints][];
refColIndex = new int[numberOfConstraints][];
for (int i = 0; i < numberOfConstraints; i++) {
Vector keys = (Vector) imKeys.elementAt(i);
Vector cols = (Vector) refCols.elementAt(i);
int numberOfKeys = keys.size();
importedKeys[i] = new String[numberOfKeys];
imColIndex[i] = new int[numberOfKeys];
refColumns[i] = new String[numberOfKeys];
refColIndex[i] = new int[numberOfKeys];
refTables[i] = (String) refTabs.elementAt(i);
// System.out.println("reference table "+refTables[i]);
for (int j = 0; j < numberOfKeys; j++) {
importedKeys[i][j] = (String) keys.elementAt(j);
imColIndex[i][j] = this.getColIndex(importedKeys[i][j]);
refColumns[i][j] = (String) cols.elementAt(j);
refColIndex[i][j] = this.getColIndex(refColumns[i][j],
refTables[i]);
// System.out.println(" importedKeys "+importedKeys[i][j]+"(Index: "+imColIndex[i][j]+") refColumns "+refColumns[i][j]+"(Index: "+refColIndex[i][j]+")");
} // end of for (int j=0; j<numberOfKeys; j++)
}
}
private void fetchPrimaryKeys() {
Vector temp = new Vector(20);
try {
if (cConn == null) {
return;
}
if (dbmeta == null) {
dbmeta = cConn.getMetaData();
}
ResultSet colList = dbmeta.getPrimaryKeys(null, null, tableName);
while (colList.next()) {
temp.addElement(colList.getString("COLUMN_NAME"));
}
colList.close();
} catch (SQLException e) {
ZaurusEditor.printStatus("SQL Exception: " + e.getMessage());
}
primaryKeys = new String[temp.size()];
temp.copyInto(primaryKeys);
pkColIndex = new int[primaryKeys.length];
for (int i = 0; i < primaryKeys.length; i++) {
pkColIndex[i] = this.getColIndex(primaryKeys[i]);
} // end of for (int i=0; i<primaryKeys.length; i++)
}
private String generatePKWhere() {
String stmtString = " WHERE ";
for (int i = 0; i < primaryKeys.length; i++) {
if (i > 0) {
stmtString += " AND ";
}
stmtString += primaryKeys[i] + "=?";
} // end of for (int i=0; i<primaryKeys.length; i++)
return stmtString;
}
// generate the Where-condition for the words
private String generateWhere(String[] words, boolean allWords,
boolean ignoreCase, boolean noMatchWhole) {
String result = "";
// if all words must match use AND between the different conditions
String join;
if (allWords) {
join = " AND ";
} else {
join = " OR ";
} // end of else
for (int wordInd = 0; wordInd < words.length; wordInd++) {
String oneCondition = "";
for (int col = 0; col < columns.length; col++) {
if (oneCondition != "") {
oneCondition += " OR ";
}
if (ignoreCase) {
if (noMatchWhole) {
oneCondition += "LOWER(" + columns[col] + ") LIKE '%"
+ words[wordInd].toLowerCase() + "%'";
} else {
oneCondition += "LOWER(" + columns[col] + ") LIKE '"
+ words[wordInd].toLowerCase() + "'";
}
} else {
if (noMatchWhole) {
oneCondition += columns[col] + " LIKE '%"
+ words[wordInd] + "%'";
} else {
oneCondition += columns[col] + " LIKE '"
+ words[wordInd] + "'";
}
}
}
if (result != "") {
result += join;
}
result += "(" + oneCondition + ")";
}
if (result != "") {
result = " WHERE " + result;
} // end of if (result != "")
// System.out.println("result: "+result);
return result;
}
// answer the index of the column named name in the actual table
private int getColIndex(String name) {
for (int i = 0; i < columns.length; i++) {
if (name.equals(columns[i])) {
return i;
} // end of if (name.equals(columns[i]))
} // end of for (int i=0; i<columns.length; i++)
return -1;
}
// answer the index of the column named colName in the table tabName
private int getColIndex(String colName, String tabName) {
int ordPos = 0;
try {
if (cConn == null) {
return -1;
}
if (dbmeta == null) {
dbmeta = cConn.getMetaData();
}
ResultSet colList = dbmeta.getColumns(null, null, tabName,
colName);
colList.next();
ordPos = colList.getInt("ORDINAL_POSITION");
colList.close();
} catch (SQLException e) {
System.out.println("SQL Exception: " + e.getMessage());
}
return ordPos - 1;
}
// answer the index of the constraint for the column index
// answer -1, if the column is not part of any constraint
private int getConstraintIndex(int colIndex) {
for (int i = 0; i < imColIndex.length; i++) {
for (int j = 0; j < imColIndex[i].length; j++) {
if (colIndex == imColIndex[i][j]) {
return i;
} // end of if (col == imColIndex[i][j])
} // end of for (int j=0; j<imColIndex[i].length; j++)
} // end of for (int i=0; i<imColIndex.length; i++)
return -1;
}
private void initGUI() {
Panel pEntry = new Panel();
pEntry.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.insets = new Insets(3, 3, 3, 3);
c.gridwidth = 1;
c.gridheight = 1;
c.weightx = c.weighty = 1;
c.anchor = GridBagConstraints.WEST;
komponente = new ZaurusComponent[columns.length];
for (int i = 0; i < columns.length; i++) {
c.gridy = i;
c.gridx = 0;
pEntry.add(new Label((String) columns[i]), c);
c.gridx = 1;
int constraint = this.getConstraintIndex(i);
if (constraint >= 0 && imColIndex[constraint].length == 1) {
// we use ony foreign keys with one index
ZaurusChoice tmp = new ZaurusChoice();
this.fillZChoice(tmp, refTables[constraint],
refColumns[constraint][0]);
tmp.addItemListener(this);
komponente[i] = tmp;
pEntry.add(tmp, c);
} else if (columnTypes[i] == java.sql.Types.DATE) {
// System.out.println("hier gibt es eine Date-Spalte namens "+columns[i]);
ZaurusTextField tmp = new ZaurusTextField(8);
tmp.addTextListener(this);
pEntry.add(tmp, c);
komponente[i] = tmp;
} else {
ZaurusTextField tmp = new ZaurusTextField(5);
tmp.addTextListener(this);
pEntry.add(tmp, c);
komponente[i] = tmp;
}
komponente[i].setEditable(true);
}
this.add(pEntry);
}
// get and show the values of the actual row in the GUI
private void showAktRow() {
try {
pStmt.clearParameters();
for (int i = 0; i < primaryKeys.length; i++) {
pStmt.setObject(i + 1, resultRowPKs[aktRowNr][i]);
} // end of for (int i=0; i<primaryKeys.length; i++)
ResultSet rs = pStmt.executeQuery();
rs.next();
for (int i = 0; i < columns.length; i++) {
komponente[i].setContent(rs.getString(i + 1));
} // end of for (int i=0; i<primaryKeys.length; i++)
rs.close();
} catch (SQLException e) {
ZaurusEditor.printStatus("SQL Exception: " + e.getMessage());
} // end of try-catch
for (int i = 0; i < columns.length; i++) {
komponente[i].clearChanges();
}
}
}
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