向一个DefaultTableModel插入一行数据为何失败？？？

Question

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Answer 1

是你的rowdata 元素个数和列的个数不匹配吧？能否把model代码贴出来一块儿看看

Answer 2

import java.sql.*;
import javax.swing.table.*;
import java.util.*;class ResultsModel extends DefaultTableModel
{
public void setStatement(Statement statement)
{
this.stmt = statement;
}

public void setResultSet(ResultSet results)
{
if(results == null)
{
columnNames = new String[0];
dataRows.clear();
fireTableChanged(null);
return;
}
try
{
metadata = results.getMetaData();

int columns = metadata.getColumnCount();
columnNames = new String[columns];

for(int i = 0 ;i < columns;i++)
columnNames[i] = metadata.getColumnLabel(i+1);

dataRows = new Vector();
String[] rowData;
while(results.next())
{
rowData = new String[columns];
for(int i = 0;i < columns;i++)
rowData[i] = results.getString(i+1);

dataRows.addElement(rowData);
}

fireTableChanged(null);
}
catch(SQLException sqle)
{
System.err.println(sqle);
}
}

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

public int getRowCount()
{
if(dataRows == null)
return 0;
else
return dataRows.size();

}

public Class getColumnClass(int c) 
{
     return getValueAt(0, c).getClass();
    }

public Object getValueAt(int row,int column)
{
return ((String[])(dataRows.elementAt(row)))[column];
}

public String getColumnName(int column)
{
return columnNames[column] == null ? "No Name" : columnNames[column];
}

public void setValueAt(Object value,int row,int col)
{
((String[])(dataRows.elementAt(row)))[col] = (String)value;
}

//使jtable中的内容可编辑
    public boolean isCellEditable(int row, int column)
    {
         return column != 0;
    }
    
    
String[] columnNames = new String[0];
Vector dataRows = new Vector();
Statement stmt;
ResultSetMetaData metadata;
String table = null;
String table_pk = null;
}这个问题我已经用另外一种方法自己解决了，修改这个ResultModel的dataRows，直接在里面增加一元素
但很上知道tableModel.addRow(rowdata);的用法，各样是这样用的吗？
以上的错误是不是因为行数和列数都由dataRows决定了，不能用addRow吗？
我自己解决的方法就是在dataRows中加入一元素就搞定了