Вот пример, который выполняет и то, что вы просите, основываясь на вашей схеме, т.е.
- . Он добавляет ряд упражнений к тренировке через таблицу сопоставления (TRAININGEXERCISE) из ArrayList (ArrayList как таковой).использует идентификаторы).
- Он производит вывод, аналогичный тому, что вы хотите (для журнала), например, примеры журналов
: -
2019-05-13 13:13:46.736 D/MYDATA: Workout: Chest
EXERCISES: Bench press,Incline bench press,Flies
2019-05-13 13:13:46.736 D/MYDATA: Workout: Abdomen
EXERCISES: hump,lug,roll
2019-05-13 13:13:46.736 D/MYDATA: Workout: Everything
EXERCISES: hump,lug,roll,kneel,Bench press,Incline bench press,Flies,Flip
Помощник базы данных, DBHelper.java было использовано: -
public class DBHelper extends SQLiteOpenHelper {
public static final String DBNAME = "workout";
public static final int DBVERSION = 1;
public static final String TABLE_TRAININGEXERCISE = "training_excercise"; //<<<<<<<< OOOPS spelling :)
public static final String TABLE_WORKOUT = "workout";
public static final String TABLE_EXERCISE = "exersise"; //<<<<<<< OOOPS spelling :)
public static final String TWORKOUT_ID = "WorkoutID";
public static final String TWORKOUT_NAME = "workour_name";
public static final String TEXERCISE_ID = "ExerciseID";
public static final String TEXERCISE_NAME = "exercise_name";
public static final String TTEEXERCISELINK = "TExerciseID"; //<<<<<<<<<< ADDED
public static final String TTEWORKOUTLINK = "TWorkoutID"; //<<<<<<<<<< ADDED
// Note as entities are always derived from constants above the spelling mistakes are irrelvant
// (need a better smellchecker :) )
//<<<<<<<<<< ENOUGH TO DEMONSTRATE >>>>>>>>>>
private static final String CREATE_TABLE_WORKOUT =
"CREATE TABLE " + TABLE_WORKOUT + "(" +
TWORKOUT_ID + " INTEGER PRIMARY KEY," +
TWORKOUT_NAME + " TEXT" +
")";
//<<<<<<<<<< ENOUGH TO DEMONSTRATE >>>>>>>>>>
private static final String CREATE_TABLE_EXERCISE =
"CREATE TABLE " + TABLE_EXERCISE + "(" +
TEXERCISE_ID + " INTEGER PRIMARY KEY," +
TEXERCISE_NAME + " TEXT " +
")";
//<<<<<<<<<<NOTE Uses constants for all entity names >>>>>>>>>> (see new ones above)
private static final String CREATE_TABLE_TRAININGEXERCISE =
"CREATE TABLE " + TABLE_TRAININGEXERCISE + "(" +
TTEEXERCISELINK + " INTEGER," +
TTEWORKOUTLINK + " INTEGER," +
"FOREIGN KEY (" + TTEEXERCISELINK + ") " +
"REFERENCES " + TABLE_EXERCISE + " (" + TEXERCISE_ID + ")," +
" FOREIGN KEY (" + TTEWORKOUTLINK + ") " +
"REFERENCES " + TABLE_WORKOUT + " (" + TWORKOUT_ID + "))";
public DBHelper(Context context) {
super(context, DBNAME, null, DBVERSION);
}
@Override
public void onConfigure(SQLiteDatabase db) {
super.onConfigure(db);
db.setForeignKeyConstraintsEnabled(true); //<<<<<<<<<< MUST HAVE FOR FOREIGN KEYS
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_TABLE_EXERCISE);
db.execSQL(CREATE_TABLE_WORKOUT);
db.execSQL(CREATE_TABLE_TRAININGEXERCISE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
public long addWorkout(String name) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues cv = new ContentValues();
cv.put(TWORKOUT_NAME,name);
return db.insert(TABLE_WORKOUT,null,cv);
}
public long addExecise(String name) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues cv = new ContentValues();
cv.put(TEXERCISE_NAME,name);
return db.insert(TABLE_EXERCISE,null,cv);
}
public long addExcerciseToWorkout(long workoutid, long exerciseid) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues cv = new ContentValues();
cv.put(TTEWORKOUTLINK,workoutid);
cv.put(TTEEXERCISELINK,exerciseid);
return db.insert(TABLE_TRAININGEXERCISE,null,cv);
}
//<<<<<<<<<< ADD MANY EXERCISES to a WORKOUT via an ArrayList
public void addManyExcercisesToWorkout(long workoutid,ArrayList<Long> exerciseids) {
ArrayList<Long> rv = new ArrayList<>();
SQLiteDatabase db = this.getWritableDatabase();
db.beginTransaction();
for (Long l: exerciseids) {
long thisid = addExcerciseToWorkout(workoutid,l);
}
db.setTransactionSuccessful();
db.endTransaction();
}
//<<<<<<<<<< Get all the exercises per workout via the group_concat function >>>>>>>>>>
public void logAllWorkoutsWithExcercises() {
SQLiteDatabase db = this.getWritableDatabase();
//<<<<<<<<<< column name aliases (not required but desireable as they can be quite cumbersome) >>>>>>>>>>
String workoutname_column_alias = "thisworkoutname";
String concantenated_exercises_alias = "all_exercises";
String tables = TABLE_WORKOUT +
" JOIN " + TABLE_TRAININGEXERCISE + " ON " + TABLE_WORKOUT + "." + TWORKOUT_ID + "=" + TTEWORKOUTLINK +
" JOIN " + TABLE_EXERCISE + " ON " + TTEEXERCISELINK + "=" + TABLE_EXERCISE + "." + TEXERCISE_ID;
String[] columns = new String[]{
TABLE_WORKOUT + "." + TWORKOUT_NAME + " AS " + workoutname_column_alias,
"'\n\tEXERCISES: '||group_concat(" +
TABLE_EXERCISE + "." + TEXERCISE_NAME +
") AS " + concantenated_exercises_alias
};
String groupby = TABLE_WORKOUT + "." + TWORKOUT_ID;
// Query resolves to :-
/*
SELECT
workout.workour_name AS thisworkoutname,
'EXERCISES: '||group_concat(exersise.exercise_name) AS all_exercises
FROM workout
JOIN training_excercise ON workout.WorkoutID=TWorkoutID
JOIN exersise ON TExerciseID=exersise.ExerciseID
GROUP BY workout.WorkoutID
*/
Cursor csr = db.query(tables,columns,null,null,groupby,null,null);
while (csr.moveToNext()) {
Log.d(
"MYDATA",
"Workout: " +
csr.getString(csr.getColumnIndex(workoutname_column_alias)) +
csr.getString(csr.getColumnIndex(concantenated_exercises_alias))
);
}
csr.close();
}
}
Тестирование было выполнено с помощью действия согласно: -
public class MainActivity extends AppCompatActivity {
String[] allexcercises = new String[]{"hump", "lug", "roll", "kneel", "Bench press", "Incline bench press", "Flies","Flip"};
// Note assume that hump is id 1, lug id 2 etc
String[] allworkouts = new String[]{"Chest","Abdomen","Everything"};
ArrayList<Long> chest_excercises = new ArrayList<>();
ArrayList<Long> abdomen_excercises = new ArrayList<>();
ArrayList<Long> everything_excercises = new ArrayList<>();
DBHelper mDBHlpr;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mDBHlpr = new DBHelper(this);
addSomeData(); //<<<<<<<<<< Adds the testing data (only designed to run once)
mDBHlpr.logAllWorkoutsWithExcercises(); //<<<<<<<<<< Output workouts with excercises
}
private void addSomeData() {
// Excercises
mDBHlpr.getWritableDatabase().beginTransaction();
for (String excercise: allexcercises) {
mDBHlpr.addExecise(excercise);
}
for (String workout: allworkouts) {
mDBHlpr.addWorkout(workout);
}
mDBHlpr.getWritableDatabase().setTransactionSuccessful();
mDBHlpr.getWritableDatabase().endTransaction();
// Build ArrayLists as if from multiple spinner selections
chest_excercises.add(new Long(5));
chest_excercises.add(new Long(6));
chest_excercises.add(new Long(7));
abdomen_excercises.add(new Long(1));
abdomen_excercises.add(new Long(2));
abdomen_excercises.add(new Long(3));
// Add all excercises to the everything workout ArrayList
for(int l=1; l <= allexcercises.length; l++) {
everything_excercises.add(new Long((long) l));
}
// Add multiple exercises per workout
mDBHlpr.addManyExcercisesToWorkout(1,chest_excercises);
mDBHlpr.addManyExcercisesToWorkout(2,abdomen_excercises);
mDBHlpr.addManyExcercisesToWorkout(3,everything_excercises);
}
}