Question

我正在尝试使用preparedStatement获取表中最后一个插入行的stop_name。我怎样才能得到最后一个插入的？

我感谢任何帮助。

行为表：

CREATE TABLE IF NOT EXISTS behaviour(
    behaviour_id INT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,
    mac VARCHAR(30) NOT NULL,
    stop_name VARCHAR(30) NOT NULL,
    stop_distance INT(11) NOT NULL,
    speed INT(11) NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

Answer 1

您可以尝试此查询：

private void doCrop() {
    final ArrayList<CropOption> cropOptions = new ArrayList<CropOption>();

    Intent intent = new Intent("com.android.camera.action.CROP");
    intent.setType("image/*");

    List<ResolveInfo> list = getPackageManager().queryIntentActivities(intent, 0);

    int size = list.size();

    if (size == 0) {
        Toast.makeText(this, getApplicationContext().getString(R.string.crop_unavailable), Toast.LENGTH_SHORT).show();
        // return
    } else {
        intent.setData(mImageCaptureUri);
        int y = 200;
        if(lastSelect == 1 || lastSelect == 2 || lastSelect == 3 || lastSelect == 4){
            y = (int) (200 * 0.5697329376854599);
        }
        intent.putExtra("outputX", 200);
        intent.putExtra("outputY", y);
        intent.putExtra("aspectX", 1);
        intent.putExtra("aspectY", 0.5697329376854599);
        intent.putExtra("scale", true);
        intent.putExtra("return-data", true);

        if (size == 1) {
            Intent i = new Intent(intent);
            ResolveInfo res = list.get(0);

            i.setComponent(new ComponentName(res.activityInfo.packageName, res.activityInfo.name));

            startActivityForResult(i, CROP_FROM_CAMERA);
        } else {
            for (ResolveInfo res: list) {
                final CropOption co = new CropOption();

                co.title = getPackageManager().getApplicationLabel(res.activityInfo.applicationInfo);
                co.icon = getPackageManager().getApplicationIcon(res.activityInfo.applicationInfo);
                co.appIntent = new Intent(intent);

                co.appIntent.setComponent(new ComponentName(res.activityInfo.packageName, res.activityInfo.name));

                cropOptions.add(co);
            }

            CropOptionAdapter adapter = new CropOptionAdapter(getApplicationContext(), cropOptions);

            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setTitle(getApplicationContext().getString(R.string.select_crop_app));
            builder.setAdapter(adapter, new DialogInterface.OnClickListener() {

                @Override
                public void onClick(DialogInterface dialog, int item) {
                    startActivityForResult(cropOptions.get(item).appIntent, CROP_FROM_CAMERA);
                }
            });

            builder.setOnCancelListener(new DialogInterface.OnCancelListener() {

                @Override
                public void onCancel(DialogInterface dialog) {

                    if (mImageCaptureUri != null) {
                        getContentResolver().delete(mImageCaptureUri, null, null);
                        mImageCaptureUri = null;
                    }
                }
            });

            AlertDialog alert = builder.create();

            alert.show();
        }
    }
}

Answer 2

另一种解决方案：

select stop_name from behaviour order by behaviour_id desc limit 1;

获取最后插入的记录的值

2 个答案: