使用连接 SQL 在 JTable 中删除？

Question

我想删除在 Id 列中按下时选择的整行数据，因此我尝试使用此代码，但出现此错误：“java.sql.SQLException: Conversion failed when convert the nvarchar value 'T123' to数据类型 int. " 'T123' 是 Id 的数据

 if (e.getSource() == delete) //button delete {
        int ret = JOptionPane.showConfirmDialog(this, "Do you want to delete?", "Confirm", JOptionPane.YES_NO_OPTION);
        if (ret != JOptionPane.YES_OPTION) {
            return;
        }
        Connection c = null;
        PreparedStatement ps = null;
        String url = "net.sourceforge.jtds.jdbc.Driver";
        int id = tb.getSelectedRow();
        try {
            Class.forName(url);
            String db = "jdbc:jtds:sqlserver://DUCTHANG:1433/student";
            c = DriverManager.getConnection(db, "username", "password");
            ps = c.prepareStatement("Delete From info where ID = ?");
            ps.setInt(1, id); //first column's value was choose in table
            ret = ps.executeUpdate();
            if (ret != -1) {
                JOptionPane.showMessageDialog(this, "This Student has been deleted");
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        } finally {
            try {
                if (c != null) {
                    c.close();
                }
                if (ps != null) {
                    ps.close();
                }
            } catch (Exception ex2) {
                ex2.printStackTrace();
            }
        }
    }

Answer 1

根据您的描述，您的数据库表的 ID 列是 NVCHAR 类型，但您将其设置为 int。这里要注意的另一点是，您需要根据所选行 ID 获取 ROW ID，然后在您的 ps 语句中使用 setString。

int id = tb.getSelectedRow();
// Now, get respective DB Row ID into String idString and then use the following
// statement in place of ps.setInt(1, id);
ps.setString(1, idString);