表是服务，计划，订阅。要求是获取“服务”表中的所有记录，但应基于最多的订阅计数对记录进行排序。我能够根据加入条件获取记录，但是无法获取没有订阅的Service表中的记录。
请注意。每个服务记录都有一个计划。但是可以有没有订阅的服务。
import android.Manifest;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Color;
import android.net.Uri;
import android.os.Bundle;
import android.provider.Settings;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.WindowManager;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.github.rubensousa.bottomsheetbuilder.BottomSheetBuilder;
import com.github.rubensousa.bottomsheetbuilder.BottomSheetMenuDialog;
import com.github.rubensousa.bottomsheetbuilder.adapter.BottomSheetItemClickListener;
import com.google.android.exoplayer2.C;
import com.google.android.exoplayer2.DefaultLoadControl;
import com.google.android.exoplayer2.ExoPlaybackException;
import com.google.android.exoplayer2.ExoPlayer;
import com.google.android.exoplayer2.ExoPlayerFactory;
import com.google.android.exoplayer2.Format;
import com.google.android.exoplayer2.LoadControl;
import com.google.android.exoplayer2.PlaybackParameters;
import com.google.android.exoplayer2.SimpleExoPlayer;
import com.google.android.exoplayer2.Timeline;
import com.google.android.exoplayer2.extractor.DefaultExtractorsFactory;
import com.google.android.exoplayer2.extractor.ExtractorsFactory;
import com.google.android.exoplayer2.source.ExtractorMediaSource;
import com.google.android.exoplayer2.source.MediaSource;
import com.google.android.exoplayer2.source.MergingMediaSource;
import com.google.android.exoplayer2.source.SingleSampleMediaSource;
import com.google.android.exoplayer2.source.TrackGroupArray;
import com.google.android.exoplayer2.trackselection.AdaptiveTrackSelection;
import com.google.android.exoplayer2.trackselection.DefaultTrackSelector;
import com.google.android.exoplayer2.trackselection.TrackSelection;
import com.google.android.exoplayer2.trackselection.TrackSelectionArray;
import com.google.android.exoplayer2.trackselection.TrackSelector;
import com.google.android.exoplayer2.ui.SimpleExoPlayerView;
import com.google.android.exoplayer2.upstream.BandwidthMeter;
import com.google.android.exoplayer2.upstream.DataSource;
import com.google.android.exoplayer2.upstream.DefaultBandwidthMeter;
import com.google.android.exoplayer2.upstream.DefaultDataSourceFactory;
import com.google.android.exoplayer2.util.MimeTypes;
import com.google.android.exoplayer2.util.Util;
import com.nbsp.materialfilepicker.MaterialFilePicker;
import com.nbsp.materialfilepicker.ui.FilePickerActivity;
import java.util.regex.Pattern;
public class SimpleVideoStream extends AppCompatActivity implements ExoPlayer.EventListener {
public static final int PERMISSIONS_REQUEST_CODE = 0;
SimpleExoPlayerView playerView;
SimpleExoPlayer player;
DataSource.Factory dataSourceFactory;
MediaSource videoSource;
BottomSheetMenuDialog menu, subtitle, time;
TextView video_title;
String title, path;
Boolean showTitle = true, showSub = false;
int timeId = 1;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Bundle b = getIntent().getExtras();
title = b.getString("mediaTitle");
path = b.getString("mediaUrl");
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
playerView = (SimpleExoPlayerView) findViewById(R.id.exo_player_view);
video_title = (TextView) findViewById(R.id.video_title);
video_title.setText(title);
if (title.equals("")) {
showTitle = false;
video_title.setVisibility(View.INVISIBLE);
}
// 1. Create a default TrackSelector
BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
TrackSelection.Factory videoTrackSelectionFactory = new AdaptiveTrackSelection.Factory(bandwidthMeter);
TrackSelector trackSelector = new DefaultTrackSelector(videoTrackSelectionFactory);
// 2. Create a default LoadControl
LoadControl loadControl = new DefaultLoadControl();
// 3. Create the player
player = ExoPlayerFactory.newSimpleInstance(this, trackSelector, loadControl);
playerView.setPlayer(player);
playerView.setKeepScreenOn(true);
playerView.setRewindIncrementMs(5 * 1000);
playerView.setFastForwardIncrementMs(5 * 1000);
// Produces DataSource instances through which media data is loaded.
dataSourceFactory = new DefaultDataSourceFactory(this, Util.getUserAgent(this, "ExoPlayer"));
// Produces Extractor instances for parsing the media data.
final ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();
// This is the MediaSource representing the media to be played.
videoSource = new ExtractorMediaSource(Uri.parse(path), dataSourceFactory, extractorsFactory, null, null);
// Prepare the player with the source.
player.addListener(this);
player.prepare(videoSource);
playerView.requestFocus();
player.setPlayWhenReady(true);// to play video when ready. Use false to pause a video
final ImageView option = (ImageView) findViewById(R.id.exo_option);
option.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Menu();
}
});
}
@Override
protected void onPause() {
super.onPause();
if (player != null) {
player.setPlayWhenReady(false); //to pause a video because now our video player is not in focus
}
}
@Override
public void onTracksChanged(TrackGroupArray trackGroups, TrackSelectionArray trackSelections) {
}
@Override
public void onLoadingChanged(boolean isLoading) {
}
@Override
public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
switch (playbackState) {
case ExoPlayer.STATE_BUFFERING:
//You can use progress dialog to show user that video is preparing or buffering so please wait
break;
case ExoPlayer.STATE_IDLE:
//idle state
break;
case ExoPlayer.STATE_READY:
// dismiss your dialog here because our video is ready to play now
break;
case ExoPlayer.STATE_ENDED:
// do your processing after ending of video
break;
}
}
@Override
public void onPlayerError(ExoPlaybackException error) {
// show user that something went wrong. I am showing dialog but you can use your way
AlertDialog.Builder adb = new AlertDialog.Builder(this);
adb.setTitle("Could not able to stream video");
adb.setMessage("It seems that something is going wrong.\nPlease try again.");
adb.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
finish(); // take out user from this activity. you can skip this
}
});
AlertDialog ad = adb.create();
ad.show();
}
@Override
public void onTimelineChanged(Timeline timeline, Object manifest, int reason) {
}
@Override
public void onRepeatModeChanged(int repeatMode) {
}
@Override
public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) {
}
@Override
public void onPositionDiscontinuity(int reason) {
}
@Override
public void onPlaybackParametersChanged(PlaybackParameters playbackParameters) {
}
@Override
public void onSeekProcessed() {
}
@Override
public void onWindowFocusChanged(boolean hasFocus) {
super.onWindowFocusChanged(hasFocus);
if (hasFocus) {
getWindow().getDecorView().setSystemUiVisibility(
View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_FULLSCREEN
| View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
}
}
public void Menu() {
String sub = showSub ? "Show" : "Hide";
String time = String.valueOf(timeId * 5);
String titleCheck = showTitle ? "Show" : "Hide";
menu = new BottomSheetBuilder(this)
.setMode(BottomSheetBuilder.MODE_LIST)
.setItemTextColor(Color.parseColor("#000000"))
.setBackgroundColor(Color.parseColor("#ffffff"))
.addItem(0, "Network flow", R.drawable.ic_info_outline_black_24dp)
.addItem(1, "Subtitle • " + sub, R.drawable.ic_subtitles_black_24dp)
.addItem(2, "Change time • " + time, R.drawable.ic_timelapse_black_24dp)
.addItem(3, "Title • " + titleCheck, R.drawable.ic_title_black_24dp)
.expandOnStart(true)
.setItemClickListener(new BottomSheetItemClickListener() {
@Override
public void onBottomSheetItemClick(MenuItem item) {
if (item.getItemId() == 0) {
NetworkFlow();
} else if (item.getItemId() == 1) {
Subtitle();
} else if (item.getItemId() == 2) {
Time();
} else if (item.getItemId() == 3) {
if (!title.equals("")) {
showTitle = !showTitle;
video_title.setVisibility((video_title.getVisibility() == View.VISIBLE) ? View.INVISIBLE : View.VISIBLE);
}
}
}
}).createDialog();
menu.show();
}
public void Subtitle() {
subtitle = new BottomSheetBuilder(this)
.setMode(BottomSheetBuilder.MODE_LIST)
.setItemTextColor(Color.parseColor("#000000"))
.setBackgroundColor(Color.parseColor("#ffffff"))
.addItem(0, "Add Url", null)
.addItem(1, "Add file", null)
.addItem(2, "Subtitle Size, Font and Color", null)
.addItem(3, "Remove subtitle", null)
.expandOnStart(true)
.setItemClickListener(new BottomSheetItemClickListener() {
@Override
public void onBottomSheetItemClick(MenuItem item) {
if (item.getItemId() == 0) DialogSubtitle();
if (item.getItemId() == 1) {
checkPermissionsAndOpenFilePicker();
}
if (item.getItemId() == 2) {
Intent intent = new Intent(Settings.ACTION_CAPTIONING_SETTINGS);
startActivity(intent);
}
if (item.getItemId() == 3) {
showSub = false;
final ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();
videoSource = new ExtractorMediaSource(Uri.parse(path), dataSourceFactory, extractorsFactory, null, null);
player.prepare(videoSource, false, false);
}
}
}).createDialog();
subtitle.show();
}
public void DialogSubtitle() {
LayoutInflater inflater = getLayoutInflater();
final View layout = inflater.inflate(R.layout.custom_alertdialog, null);
final EditText url_ele = (EditText) layout.findViewById(R.id.url);
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Add Subtitle");
builder.setCancelable(true);
builder.setPositiveButton(
"Ok",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
String sub = url_ele.getText().toString();
if (!sub.equals("")) {
addSub(sub);
}
dialog.cancel();
}
});
builder.setNegativeButton(
"Close",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.setView(layout);
alert.show();
}
public void Time() {
Integer[] array = new Integer[13];
for (int i = 0; i < 13; i++)
array[i] = timeId == i ? R.drawable.ic_check_black_24dp : R.drawable.ic_more_vert_white_24dp;
time = new BottomSheetBuilder(this)
.setMode(BottomSheetBuilder.MODE_LIST)
.setItemTextColor(Color.parseColor("#000000"))
.setBackgroundColor(Color.parseColor("#ffffff"))
.addItem(0, "0", array[0])
.addItem(1, "5", array[1])
.addItem(2, "10", array[2])
.addItem(3, "15", array[3])
.addItem(4, "20", array[4])
.addItem(5, "25", array[5])
.addItem(6, "30", array[6])
.addItem(7, "35", array[7])
.addItem(8, "40", array[8])
.addItem(9, "45", array[9])
.addItem(10, "50", array[10])
.addItem(11, "55", array[11])
.addItem(12, "60", array[12])
.expandOnStart(true)
.setItemClickListener(new BottomSheetItemClickListener() {
@Override
public void onBottomSheetItemClick(MenuItem item) {
Log.v("ok", " click3-" + item.getTitle());
timeId = item.getItemId();
int t = Integer.parseInt(String.valueOf(item.getTitle()));
playerView.setRewindIncrementMs(t * 1000);
playerView.setFastForwardIncrementMs(t * 1000);
}
}).createDialog();
time.show();
}
public void NetworkFlow() {
LayoutInflater inflater = getLayoutInflater();
final View layout = inflater.inflate(R.layout.custom_alertdialog, null);
final EditText url_ele = (EditText) layout.findViewById(R.id.url);
url_ele.setText(path);
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Network flow");
builder.setCancelable(true);
builder.setPositiveButton(
"Ok",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
String sub = url_ele.getText().toString();
if (!sub.equals("")) {
}
dialog.cancel();
}
});
builder.setNegativeButton(
"Close",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.setView(layout);
alert.show();
}
private void checkPermissionsAndOpenFilePicker() {
String permission = Manifest.permission.READ_EXTERNAL_STORAGE;
if (ContextCompat.checkSelfPermission(this, permission) != PackageManager.PERMISSION_GRANTED) {
/*if (ActivityCompat.shouldShowRequestPermissionRationale(this, permission)) {
showError();
} else {*/
ActivityCompat.requestPermissions(this, new String[]{permission}, PERMISSIONS_REQUEST_CODE);
//}
} else {
openFilePicker();
}
}
private void showError() {
Toast.makeText(this, "Allow external storage reading", Toast.LENGTH_SHORT).show();
}
private void openFilePicker() {
new MaterialFilePicker()
.withActivity(this)
.withRequestCode(PERMISSIONS_REQUEST_CODE)
.withFilter(Pattern.compile(".*\\.srt$"))
.withHiddenFiles(true)
.start();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == PERMISSIONS_REQUEST_CODE && resultCode == RESULT_OK) {
String sub = data.getStringExtra(FilePickerActivity.RESULT_FILE_PATH);
addSub(sub);
}
}
private void addSub(String sub) {
showSub = true;
Format textFormat = Format.createTextSampleFormat(null, MimeTypes.APPLICATION_SUBRIP, null, Format.NO_VALUE, Format.NO_VALUE, "en", null, Format.OFFSET_SAMPLE_RELATIVE);
MediaSource textMediaSource = new SingleSampleMediaSource.Factory(dataSourceFactory).createMediaSource(Uri.parse(sub), textFormat, C.TIME_UNSET);
videoSource = new MergingMediaSource(videoSource, textMediaSource);
player.prepare(videoSource, false, false);
}
}
有人可以调查这个问题并寻求帮助。
答案 0 :(得分：1)
这可能是表之间的三种方式的联接，按订阅而不是按计划进行汇总。像这样：
SELECT s.*
FROM service s
LEFT JOIN plan p
ON s.service_id = p.service_id
LEFT JOIN subscribe su
ON p.plan_id = su.plan_id
GROUP BY
s.service_id
ORDER BY
COUNT(su.subscribe_id) DESC;
如果您还想选择订阅计数，则可以将COUNT(su.subscribe_id)项添加到select子句中。请注意，在从service_id表中选择所有列的同时，仅通过service进行聚合，在此假设service_id是该表中的主键是有效的。
答案 1 :(得分：0)
最简单的答案是，您需要左连接，以便可以获取服务中的所有记录+订阅中匹配的任何记录。
SELECT DISTINCT s.service_id
FROM service s
JOIN plan p on s.service_id=p.service_id
left join subscribe su on p.plan_id=su.plan_id
WHERE
(s.status='Published' AND s.is_active=1)
GROUP BY su.plan_id
ORDER BY COUNT(isnull(su.subscribe_id,0)) DESC
此外，您可能希望将计数移到选择部分。像这样：
select * from
SELECT s.service_id, COUNT(isnull(su.subscribe_id,0)) as [cnt]
FROM service s
JOIN plan p on s.service_id=p.service_id
left join subscribe su on p.plan_id=su.plan_id
WHERE
(s.status='Published' AND s.is_active=1)
GROUP BY su.plan_id ) A
ORDER BY [cnt] DESC
我对列别名使用了SQL Server约定。如果您使用的是其他DBMS，请相应地进行更改。如果您遇到服务没有计划的情况，也应该将其更改为左联接。