我的问题是:我如何实现一个“添加行”按钮,该按钮创建一个新的JTable行(从SQLite数据库中获取数据),其中包含最后一行id的自动增量++。 id列已经自动增加了数据,现在我知道创建一个所有字段为空的新行(没有最新行的增量++)。 请有人帮忙吗?
private void cmd_newrowActionPerformed(java.awt.event.ActionEvent evt) {
((DefaultTableModel) PrimaryTable.getModel()).addRow(new Vector());
}
我想要的是什么:
==================
id | data |
==================
1 | some_data |
2 | some_data |
3 | some_data |
==================
After I press addRow button:
==================
id | data |
==================
1 | some_data |
2 | some_data |
3 | some_data |
4 | blank | /// blank row data with an autoincrement of the row id
==================
更新
好的,现在我知道如何在数据库中插入新行,但我不知道如何更新JXTable。因此,它运行的波纹管代码,以及重新启动应用程序后更新的新空白行。有人可以帮帮我吗?
private void cmd_newrowActionPerformed(java.awt.event.ActionEvent evt) {
try {
String sql = "Insert into RDSSPrimaryTable (sample_no,mineral_name,chemical_formula,main_peaks,other_peaks,reference,link,comments,spectrum) values (?,?,?,?,?,?,?,?,?)";
pst = conn.prepareStatement(sql);
// no pst.setString for id - it takes automatically
pst.setString(1, txt_sample_pt.getText());
pst.setString(2, txt_mineral_pt.getText());
pst.setString(3, txt_chemical_pt.getText());
pst.setString(4, txt_main_pt.getText());
pst.setString(5, txt_other_pt.getText());
pst.setString(6, txt_reference_pt.getText());
pst.setString(7, txt_link_pt.getText());
pst.setString(8, txt_comments_pt.getText());
pst.setBytes(9, person_image);
JOptionPane.showMessageDialog(null, "Inserted");
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
((DefaultTableModel) PrimaryTable.getModel()).fireTableDataChanged(); // I tried this method even if the DefaultTableModel fire table automatically.
PrimaryTable.repaint(); //tried also repaint, revalidate - nothing happens
}
答案 0 :(得分:0)
使用以下代码在数据库中创建序列
CREATE SEQUENCE sample_number
START WITH 1
INCREMENT BY 1;
然后在您的代码中进行以下更改:
String sql = "Insert into RDSSPrimaryTable (sample_no,mineral_name,chemical_formula,main_peaks,other_peaks,reference,link,comments,spectrum) values (sample_number.nextval(),?,?,?,?,?,?,?,?)";
pst = conn.prepareStatement(sql);
pst.setString(1, txt_mineral_pt.getText());
pst.setString(2, txt_chemical_pt.getText());
pst.setString(3, txt_main_pt.getText());
pst.setString(4, txt_other_pt.getText());
pst.setString(5, txt_reference_pt.getText());
pst.setString(6, txt_link_pt.getText());
pst.setString(7, txt_comments_pt.getText());
pst.setBytes(8, person_image);