如何从一个文本域获取值到另一个文本域

时间:2013-01-13 14:31:39

标签: java sql

我想从DATAENTRY类的文本字段中获取值到我当前的类SoilTable中,以使表格正常工作

private void btgetinvActionPerformed(java.awt.event.ActionEvent evt) {                                         



    try {                                 //my class DATAENTRY from which i have to fetch the value of textfield tf_rm_id
        DBUtil util = new DBUtil();
        Connection con = util.getConnection();
        PreparedStatement stmt = con.prepareStatement("select COUNT(box_no)as total from mut_det WHERE rm_id = ?");
        ResultSet rs;
        String rm = tf_rm_id.getText().trim();
        stmt.setInt(1, Integer.parseInt(rm));
        rs = stmt.executeQuery();
        while (rs.next()) {
            tf_boxno.setText(rs.getString("total"));
        }

这是我的班级,我想替换textfield tf_rm_id的值为?参数

      try {                                               // My current class SoilTable
        DBUtil util = new DBUtil(); 
        Connection con = util.getConnection(); 
        Statement stmt = con.createStatement();
        ResultSet rs = stmt.executeQuery("select * from soil_det where rm_id=?");
        String rmn = (tf_rm_id.getText() == null || tf_rm_id.getText().equals("")) ? "0" : tf_rm_id.getText();
        stmt.setLong(1, Long.parseLong(rmn));

1 个答案:

答案 0 :(得分:1)

如果我理解得很好(你的代码不是很清楚),我会创建一个方法并返回该值。

在你的另一个类中,我会创建该类的一个对象并调用该方法,然后根据需要将其分配给另一个值,如:

// DATAENTRY class

  public String getVal()
  {
      return tf_rm_id;
   }

// SoilTable

 DATAENTRY textFieldVal = new DATAENTRY();

 String strTextFieldVal = textFieldVal.getVal();
 //assigned a new value
 strTextFieldVal = " field value manipulated";

//or display it directly:

 System.out.println("Value recieved: "+textFieldVal.getVal());