Error when querying a created dbView (not table)!

For context see post

Following the awsome sugestion provided by yock, I changed my database design to use foreign keys. You can check the overall database design in this post.

So I have 2 tables.

              TABLE(1)                         TABLE (2)
+--------------------------------------+     +-----------+
|            SURVEYS TABLE             |     |   ICONS   |
+----+------+-------------+------------+     +----+------+
| ID | name | description |   iconID   |     | ID | ICON |
+----+------+-------------+------------+     +----+------+
|    |      |             | FOREIGN KEY|     
+--------------------------------------+     

I constructed a VIEW using the two tables.

public static final String VIEW_SURVEYS = "surveysview";

      public static final String VIEW_SURVEYS_CREATE =
       "CREATE VIEW " + VIEW_SURVEYS +
       " AS SELECT " + TABLE_SURVEYS + "." + KEY_ROWID + " AS _id, " + 
       TABLE_SURVEYS + "." + KEY_NAME + ", " +
       TABLE_SURVEYS + "." + KEY_DESCRIPTION + ", " +
       TABLE_ICONS + "." + KEY_ICON + " " +
       "FROM " + TABLE_SURVEYS + " JOIN " + TABLE_ICONS +
       " ON " + TABLE_SURVEYS + "." + KEY_ICONID + " = " +
                TABLE_ICONS + "." + KEY_ROWID;

The tables and views are called in my Adapter constructor.

private static class DatabaseHelper extends SQLiteOpenHelper 
{
    DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {

    // TABLES
    db.execSQL(TABLE_ICONS_CREATE);
    db.execSQL(TABLE_SURVEYS_CREATE);

    // VIEWS
    db.execSQL(VIEW_SURVEYS_CREATE);
    }

And this is the method used to query the view.

    public Cursor getSurveys() {
return db.query(VIEW_SURVEYS, new String[] {
        KEY_ROWID, KEY_NAME, KEY_DESCRIPTION, KEY_ICON},
        null, null, null, null, null);
}

Which is called in my activity through a cursor

    DBAdapter db = new DBAdapter(this);
    db.open(); // Opens db session 
    Cursor survey_cursor = db.getSurveys();
    startManagingCursor(survey_cursor);

The problem is when I try run the above code, my program crashes. The line at it crashes is Cursor survey_cursor = db.getSurveys();

And Catlog show

11-25 16:19:42.324: ERROR/AndroidRuntime(6146): Caused by: android.database.sqlite.SQLiteException: no such table: surveysview: , while compiling: SELECT _id, name, description, icon FROM surveysview

I reread the code countless times and can't find anything开发者_Python百科 wrong. What am I missing?

Here's the output for SELECT * FROM sqlite_master

table|android_metadata|android_metadata|3|CREATE TABLE android_metadata (locale TEXT)

table|fieldtype|fieldtype|4|CREATE TABLE fieldtype (_id integer primary key autoincrement, type text not null)

table|sqlite_sequence|sqlite_sequence|5|CREATE TABLE sqlite_sequence(name,seq)

table|editicons|editicons|6|CREATE TABLE editicons (_id integer primary key autoincrement, icon text not null)

table|surveys|surveys|7|CREATE TABLE surveys (_id integer primary key autoincrement, name text not null, description text, editableid integer not null, FOREIGN KEY(editableid) REFERENCES editicons(_id))

table|questions|questions|8|CREATE TABLE questions (_id integer primary key autoincrement, field text not null, typeid text not null, survey_id integer not null, FOREIGN KEY(typeid) REFERENCES fieldtype(_id)FOREIGN KEY(survey_id) REFERENCES surveys(_id))

table|choices|choices|9|CREATE TABLE choices (choice text, question_id integer not null, FOREIGN KEY(question_id) REFERENCES questions(_id))

table|answers|answers|10|CREATE TABLE answers (choice_id integer not null, FOREIGN KEY(choice_id) REFERENCES choices(_id))

view|surveysview|surveysview|0|CREATE VIEW surveysview AS SELECT surveys._id AS _id, surveys.name AS name, surveys.description AS description, editicons.icon AS icon FROM surveys JOIN editicons ON surveys.editableid = editicons._id

(this output reflects some changes I made to the code since I added " AS " after each column)

---

Perhaps android.database.sqlite.SQLiteDatabase doesn't support views in calls to query; try using rawQuery such as:

return db.rawQuery("select * from " + VIEW_SURVEYS);

If this works, replace * with your column names.

Here's what I get in the sqlite3 shell using your schema:

e$ sqlite3
SQLite version 3.7.3
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite> CREATE TABLE editicons (_id integer primary key autoincrement, icon text not null);
sqlite> CREATE TABLE surveys (_id integer primary key autoincrement, name text not null, description text, editableid integer not null, FOREIGN KEY(editableid) REFERENCES editicons(_id));
sqlite> CREATE VIEW surveysview AS SELECT surveys._id AS _id, surveys.name AS name, surveys.description AS description, editicons.icon AS icon FROM surveys JOIN editicons ON surveys.editableid = editicons._id;
sqlite> select * from surveysview;
sqlite> insert into editicons values (null,"icon1");
sqlite> select * from editicons;
1|icon1
sqlite> insert into surveys values (NULL, 'survey1', 'survey1 desc', 1);
sqlite> select * from surveysview;
1|survey1|survey1 desc|icon1
sqlite> 

So, if something is amis it must be in the Android implementation.

---

AH Finally found it!

It was an error in the method that populated ICONS table. Strangely, no error was thrown. So, when the View accessed that table, the error propagated.

I actually found the bug through the adb console, when reading contents of the ICONS table.

Corrected that, now works like a charm.