JDBCTableModelpublic class JDBCTableModel extends AbstractTableModel | an immutable table model built from getting
metadata about a table in a jdbc database |
| Fields Summary |
|---|
| Object[] | contents | | String[] | columnNames | | Class[] | columnClasses |
| Constructors Summary |
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public JDBCTableModel(Connection conn, String tableName)
super();
getTableContents (conn, tableName);
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| Methods Summary |
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| public java.lang.Class | getColumnClass(int col)
return columnClasses [col];
| | public int | getColumnCount()
if (contents.length == 0)
return 0;
else
return contents[0].length;
| | public java.lang.String | getColumnName(int col)
return columnNames [col];
| | public int | getRowCount()
return contents.length;
| | protected void | getTableContents(java.sql.Connection conn, java.lang.String tableName)
// 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) ;
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.TIMESTAMP:
colClassesList.add (java.sql.Date.class); break;
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);
ArrayList rowList = new ArrayList();
while (results.next()) {
ArrayList cellList = new ArrayList();
for (int i = 0; i<columnClasses.length; 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.getDate (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();
| | public java.lang.Object | getValueAt(int row, int column)
return contents [row][column];
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