ListSelectionModel - getMinSelectionIndex() renvoie à tort -1

Question

J'ai extrait une table d'une base de données Oracle via un TableModel. Voici le code source:

package database; 

import javax.swing.*; 
import javax.swing.table.*; 
import javax.swing.text.Document; 

import oracle.jdbc.internal.OracleResultSet; 
import oracle.sql.CLOB; 
import oracle.xdb.XMLType; 

import java.sql.*; 
import java.util.*; 

/** 
* an immutable table model built from getting metadata about a table in a jdbc 
* database 
*/ 
public class TestKonfigTableModel extends AbstractTableModel { 
static Object[][] contents; 
String[] columnNames; 
Class[] columnClasses; 

public TestKonfigTableModel(Connection conn, String tableName) throws SQLException { 
    super(); 
    getTableContents(conn, tableName); 

} 

protected void getTableContents(Connection conn, String tableName) throws SQLException { 

    // get metadata: what columns exist and what 
    // types (classes) are they? 
    DatabaseMetaData meta = conn.getMetaData(); 
    System.out.println("got meta = " + meta); 
    ResultSet results = meta.getColumns(null, null, tableName, null); 
    OracleResultSet orset = (OracleResultSet)results; 
    System.out.println("got column results"); 
    ArrayList colNamesList = new ArrayList(); 
    ArrayList colClassesList = new ArrayList(); 

    while (results.next()) { 
     colNamesList.add(results.getString("COLUMN_NAME")); 
     System.out.println("name: " + results.getString("COLUMN_NAME")); 
     int dbType = results.getInt("DATA_TYPE"); 
     switch (dbType) { 
     case Types.INTEGER: 
      colClassesList.add(Integer.class); 
      break; 
     case Types.FLOAT: 
      colClassesList.add(Float.class); 
      break; 
     case Types.DOUBLE: 
     case Types.REAL: 
      colClassesList.add(Double.class); 
      break; 
     case Types.DATE: 
     case Types.TIME: 
     case Types.TIMESTAMP: 
      colClassesList.add(java.sql.Timestamp.class); 
      break; 

     case Types.SQLXML: 
      colClassesList.add(oracle.xdb.XMLType.class); 

     default: 
      colClassesList.add(String.class); 
      break; 
     } 
     ; 
     System.out.println("type: " + results.getInt("DATA_TYPE")); 
    } 

    columnNames = new String[colNamesList.size()]; 
    colNamesList.toArray(columnNames); 
    columnClasses = new Class[colClassesList.size()]; 
    colClassesList.toArray(columnClasses); 

    // get all data from table and put into 
    // contents array 

    Statement statement = conn.createStatement(); 
    results = statement.executeQuery("SELECT * FROM " + tableName + " ORDER BY 1"); 
    ArrayList rowList = new ArrayList(); 
    while (results.next()) { 
     ArrayList cellList = new ArrayList(); 
     for (int i = 0; i < columnClasses.length - 1; i++) { 
      Object cellValue = null; 

      if (columnClasses[i] == String.class) 
       cellValue = results.getString(columnNames[i]); 
      else if (columnClasses[i] == Integer.class) 
       cellValue = new Integer(results.getInt(columnNames[i])); 
      else if (columnClasses[i] == Float.class) 
       cellValue = new Float(results.getInt(columnNames[i])); 
      else if (columnClasses[i] == Double.class) 
       cellValue = new Double(results.getDouble(columnNames[i])); 
      else if (columnClasses[i] == java.sql.Date.class) 
       cellValue = results.getTimestamp(columnNames[i]); 
      else if (columnClasses[i] == oracle.xdb.XMLType.class) { 
       cellValue = results.getSQLXML(columnNames[i]); 
      } else 
       System.out.println("Can't assign " + columnNames[i]); 
      cellList.add(cellValue); 
     } // for 
     Object[] cells = cellList.toArray(); 
     rowList.add(cells); 

    } // while 
     // finally create contents two-dim array 
    contents = new Object[rowList.size()][]; 
    for (int i = 0; i < contents.length; i++) 

     contents[i] = (Object[]) rowList.get(i); 
    System.out.println("Created model with " + contents.length + " rows"); 

    // close stuff 
    results.close(); 
    statement.close(); 

} 

// AbstractTableModel methods 
public int getRowCount() { 
    return contents.length; 
} 

public int getColumnCount() { 
    if (contents.length == 0) 
     return 0; 
    else 
     return contents[0].length; 
} 

public Object getValueAt(int row, int column) { 
    return contents[row][column]; 
} 

// overrides methods for which AbstractTableModel 
// has trivial implementations 

public Class getColumnClass(int col) { 
    return columnClasses[col]; 
} 

public String getColumnName(int col) { 
    return columnNames[col]; 
} 
} 

Tout a bien fonctionné, ma table est montrée exactement comme je le voulais. Maintenant, cependant, je veux ajouter un écouteur d'action aux lignes de la table, de sorte que sur un double-clic, le numéro de la ligne est retourné. Cela retourne maintenant toujours -1. Selon la description de l'API, cela signifie qu'aucune ligne n'est sélectionnée. Mais je n'ai pas sélectionné et double-cliquez sur certaines lignes et il continue de revenir -1. Pour tester des raisons que j'ai écrit tout cela dans une méthode principale, donc excuser le mauvais style:

package database; 

import javax.swing.*; 
import javax.swing.table.*; 

import oracle.jdbc.pool.OracleDataSource; 

import java.sql.*; 
import java.util.*; 
import java.awt.event.MouseAdapter; 
import java.awt.event.MouseEvent; 
import java.io.*; 

public class GUIAutoTest { 
public static void main(String[] args) { 
    try { 

     /* 
     * driver, url, user, and pass can be passed in as system properties 
     * "jdbctable.driver", "jdbctable.url", "jdbctable.user", and 
     * "jdbctable.pass", or specified in a file called 
     * "jdbctable.properties" in current directory 
     */ 
     Properties testProps = new Properties(); 
     String ddriver = System.getProperty("jdbctable.driver"); 
     String durl = System.getProperty("jdbctable.url"); 
     String duser = System.getProperty("jdbctable.user"); 
     String dpass = System.getProperty("jdbctable.pass"); 
     ListSelectionModel testSelectionModel; 

     if (ddriver != null) 
      testProps.setProperty("jdbctable.driver", ddriver); 
     if (durl != null) 
      testProps.setProperty("jdbctable.url", durl); 
     if (duser != null) 
      testProps.setProperty("jdbctable.user", duser); 
     if (dpass != null) 
      testProps.setProperty("jdbctable.pass", dpass); 
     try { 
      testProps.load(new FileInputStream(new File("jdbctable.properties"))); 
     } catch (Exception e) { 
     } // ignore FNF, etc. 

     System.out.println("Test Properties:"); 
     testProps.list(System.out); 
     // now get a connection 
     // note care to replace nulls with empty strings 
     OracleDataSource ods = new OracleDataSource(); 
     ods.setDriverType("thin"); 
     ods.setNetworkProtocol("tcp"); 
     ods.setDatabaseName("***"); 
     ods.setServerName("***"); 
     ods.setPortNumber(1521); 
     ods.setUser("***"); 
     ods.setPassword("***"); 
     Connection conn = ods.getConnection(); 
     // create db table to use 
     String tableName = createSampleTable(conn); 

     // get a model for this db table and add to a JTable 
     TableModel mod = new TestKonfigTableModel(conn, tableName); 
     JTable jtable = new JTable(mod); 

     testSelectionModel = jtable.getSelectionModel(); 
     testSelectionModel.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); 
     int testKonfig = testSelectionModel.getMinSelectionIndex(); 

     jtable.addMouseListener(new MouseAdapter() { 
      public void mousePressed(MouseEvent event) { 
       if (event.getClickCount() == 2) { 
        System.out.println(testKonfig); 
       } 
      } 
     }); 


     JScrollPane scroller = new JScrollPane(jtable, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, 
       ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED); 
     JFrame frame = new JFrame("JDBCTableModel demo"); 
     frame.getContentPane().add(scroller); 
     frame.pack(); 
     frame.setVisible(true); 

     conn.close(); 

    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
} 

public static String createSampleTable(Connection conn) throws SQLException { 
    return "TEST_KONFIG"; 
} 

}

Où est mon erreur?

Answer 1

int testKonfig = testSelectionModel.getMinSelectionIndex(); 

    jtable.addMouseListener(new MouseAdapter() { 
     public void mousePressed(MouseEvent event) { 
      if (event.getClickCount() == 2) { 
       System.out.println(testKonfig); 
      } 
     } 
    }); 

Vous définissez la valeur de "testDonfig" avant que l'utilisateur n'ait à cliquer sur une ligne.

le code doit être:

//int testKonfig = testSelectionModel.getMinSelectionIndex(); 

    jtable.addMouseListener(new MouseAdapter() { 
     public void mousePressed(MouseEvent event) { 
      if (event.getClickCount() == 2) { 
       int testKonfig = testSelectionModel.getMinSelectionIndex(); 
       System.out.println(testKonfig); 
      } 
     } 
    });