Java 如何显示条目是否在数据库中？

我目前正在制作一个程序，可以删除数据库中的某些条目。我可以这样做，但我想添加一个JOptionPane屏幕，以便在它可以或无法找到它时显示它（因此，当找不到名称时，不应该找到它，并显示一条消息说找不到它）。我尝试使用结果语句，但似乎不起作用。如果有人知道怎么做，请评论怎么做

private void btnDeleteActionPerformed(java.awt.event.ActionEvent evt) {                                          
    ArrayList<Cookbook  > recipes = new ArrayList();
    String name = txtName.getText();
    try {
        String url = "jdbc:derby://localhost:1527/Cookbook";
        Connection conn = DriverManager.getConnection(url);
        String query = "DELETE from RECIPES WHERE NAME = ?";
        PreparedStatement pst = conn.prepareStatement(query);
        pst.setString(1, name);
        pst.executeUpdate();




        JOptionPane.showMessageDialog(null, name + " was sucessfully deleted");
    } catch (Exception e) {
        JOptionPane.showMessageDialog(null, "was not found or could not be deleted");
    }

private void btnDeleteActionPerformed（java.awt.event.ActionEvent evt）{
ArrayList recipes=新的ArrayList（）；
String name=txtName.getText（）；
试一试{
String url=“jdbc:derby://localhost:1527/Cookbook";
连接conn=DriverManager.getConnection（url）；
String query=“从配方中删除，其中名称=？”；
PreparedStatement pst=conn.prepareStatement（查询）；
pst.setString（1，名称）；
pst.executeUpdate（）；
showMessageDialog（null，名称+“已成功删除”）；
}捕获（例外e）{
showMessageDialog（null，“未找到或无法删除”）；
}

引用javadoc：

返回：

对于SQL数据操作语言（DML）语句，（1）行计数，或者（2）对于不返回任何内容的SQL语句，行计数为0

因此：

String url = "jdbc:derby://localhost:1527/Cookbook";
try (Connection conn = DriverManager.getConnection(url)) {
    String query = "DELETE from RECIPES WHERE NAME = ?";
    try (PreparedStatement pst = conn.prepareStatement(query)) {
        pst.setString(1, name);
        int rowCount = pst.executeUpdate();
        if (rowCount == 0) {
            JOptionPane.showMessageDialog(null, "'" + name + "' was not found");
        } else if (rowCount == 1) {
            JOptionPane.showMessageDialog(null, "'" + name + "' was successfully deleted");
        } else { // cannot happen if `NAME` has unique index in the database
            JOptionPane.showMessageDialog(null, rowCount + " recipes named '" + name + "' were deleted");
        }
    }
} catch (Exception e) {
    JOptionPane.showMessageDialog(null, "something went wrong: " + e);
}