Question

它不会添加数据，列名工作，我很疲惫我不知道从哪里开始。没有错误消息只是不会这样做，它显示对象而不是字符串也不知道为什么它不会工作，因为model.addRow（）要求一个对象[] []，我相信我提供？

initComponents();
   try {
    PreparedStatement stat = Domein.dConnection().prepareStatement("SELECT domainid , domain FROM nabilpx84_hamchi.dnsp_domains");
        ResultSet resultaat = stat.executeQuery();
        ResultSetMetaData naam = resultaat.getMetaData();

        Object[] kolommen = new Object[2];
        Object[][] data = null ;
        DefaultTableModel model = new DefaultTableModel(null,data);

        // kolom namen          
        for (int i = 1; i <= naam.getColumnCount(); ++i) {
            model.addColumn(naam.getColumnName(i));
        }
        //records

        data = new Object[1][2];

         while(resultaat.next())
        {
            data[0][0] = resultaat.getInt(1);
            data[0][1] = resultaat.getString(2);
            if(resultaat.isFirst())
            {
                model.addRow(data);
            }
        }

        uitvoerTabel.setModel(model);


    } catch (SQLException ex) {
        Logger.getLogger(Domein.class.getName()).log(Level.SEVERE, null, ex);
    }

Answer 1

你有一些看起来很时髦的代码，你似乎在将两次数据添加到你的表模型中。为什么不创建一个DefaultTableModel，其列标题为Vector或String数组，行数为0，然后在while循环中添加Object数组行或Vector行？

此外，您必须为每一行创建一个新的Object数组或Vector。你在while循环中没有这样做。

类似的东西：

ResultSet resultaat = stat.executeQuery(); ResultSetMetaData naam = resultaat.getMetaData(); Vector<String> columnVector = new Vector<String>(); for (int i = 1; i <= naam.getColumnCount(); ++i) { columnVector.addElement(naam.getColumnName(i)); } DefaultTableModel model = new DefaultTableModel(columnVector, 0); while(resultaat.next()) { // you must create a new Object array or Vector for each row Object[] rowData = new Object[2]; rowData[0] = resultaat.getInt(1); rowData[1] = resultaat.getString(2); if(resultaat.isFirst()) { // not sure what this is for model.addRow(rowData); } }

另外，请查看Rob Camick在数据库博客中的表格，您可以在此处找到：Table From Database

Answer 2

你可以尝试这样的事情：

ResultSetMetaData metaData = rs.getMetaData();

// names of columns
Vector<String> columnNames = new Vector<String>();
int columnCount = metaData.getColumnCount();
for (int column = 1; column <= columnCount; column++) {
    columnNames.add(metaData.getColumnName(column));
}

// data of the table
Vector<Vector<Object>> data = new Vector<Vector<Object>>();
while (rs.next()) {
    Vector<Object> vector = new Vector<Object>();
    for (int columnIndex = 1; columnIndex <= columnCount; columnIndex++) {
        vector.add(rs.getObject(columnIndex));
    }
    data.add(vector);
}

DefaultTableModel model = new DefaultTableModel(data, columnNames);

另一方面，服务层可以帮助您在Swing应用程序中解耦或拥有一个或多个存储库的服务外观。

Answer 3

我有自己的班级，我从头痛中幸存下来如果你需要填写任何jtable，试试这个：

SQLGenerat sql  = new SQLGenerat ();
jTable1.setModel(new DefaultTableModel(sql.getRows("SQL code"), sql.getColumns("SQl CODE")));

这是您可以使用它的类

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

/**
 *
 * @author Azad
 */
public class SQLGenerat {
    Connection con;
    Statement  st ;
    ResultSet  rs ;


    public Vector getColumnNames(String sql)
      {
          Vector  columnNames = new Vector();
          /*
           *dont foeget to  wirte your connection 
           *before executing any sql statement
           */
          try{
              st = con.createStatement();
              rs=  st.executeQuery(sql);
              ResultSetMetaData metaData = rs.getMetaData();
              int columns = metaData.getColumnCount();

              while(rs.next())
              {
                  Vector column = new Vector(columns);
                  for(int i = 0 ; i <= columns-1 ; i++){
                      column.addElement(metaData.getColumnName(i));
                  }
                  columnNames.addElement(column);
              }
          }
          catch(SQLException ex)
          {
             System.out.println(ex.getMessage());
          }
          return columnNames;
      }

      public Vector getRowDatas(String sql)
      {
          Vector rowDatas = new Vector ();
           /*
           *dont foeget to  wirte your connection 
           *before executing any sql statement
           */

          try{
              st = con.createStatement();
              rs=st.executeQuery(sql);
              ResultSetMetaData metaData = rs.getMetaData();
              int columns = metaData.getColumnCount();


              while(rs.next())
              {
                  Vector  rows = new Vector(columns);

                  for(int i = 0 ; i <= columns -1 ;i++)
                  {
                      rows.addElement(rs.getObject(i));
                  }
                  rowDatas.addElement(rows);
              }
              rs.close();
              st.close();
          }
          catch(Exception ex)
          {
              System.out.println(ex.getMessage());
          }


          return rowDatas;
      }
}

结果集中的基本编程JTable模型

3 个答案: