[英]Add row in a JTable with autoincrement of the last row id
我的问题是:我该如何实现“添加行”按钮,以使用最后一行ID的autoincrement ++来创建JTable的新行(从SQLite数据库获取数据)。 id列中的数据已经自动递增了,现在我知道只需要创建一个新行,所有字段都为空(不增加最新行的++)。 拜托,有人可以帮忙吗?
private void cmd_newrowActionPerformed(java.awt.event.ActionEvent evt) {
((DefaultTableModel) PrimaryTable.getModel()).addRow(new Vector());
}
我想要的是:
==================
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,到目前为止,我知道如何在数据库中插入新行,但是我不知道如何更新JXTable。 因此,下面的代码可以正常工作,并且在我重新启动应用程序后会更新新的空白行。 有人可以帮我吗?
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
}
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;
之后,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);
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