/*
* Copyright (C) 2008 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package uni.projecte.dataLayer.bd;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
/**
* Simple Attribute database access helper class.
*/
public class FieldDbAdapter {
public static final String KEY_ROWID = "idAtt";
public static final String KEY_RS = "idRs";
public static final String NAME = "name";
public static final String TYPE = "idType";
private static final String TAG = "AttributeDbAdapter";
private DatabaseHelper mDbHelper;
private SQLiteDatabase mDb;
private static final String DATABASE_NAME = "mobileSamplingAtt";
private static final String DATABASE_TABLE = "Attribute";
/**
* Database creation sql statement
*/
private static final String DATABASE_CREATE =
"create table "+DATABASE_TABLE+" ("
+ KEY_ROWID + " INTEGER PRIMARY KEY,"
+ KEY_RS + " INTEGER,"
+ NAME + " TEXT,"
+ TYPE + " TEXT"
+ ");";
private static final int DATABASE_VERSION = 2;
private final Context mCtx;
private static class DatabaseHelper extends SQLiteOpenHelper {
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(DATABASE_CREATE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
+ newVersion + ", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS notes");
onCreate(db);
}
}
/**
* Constructor - takes the context to allow the database to be
* opened/created
*
* @param ctx the Context within which to work
*/
public FieldDbAdapter(Context ctx) {
this.mCtx = ctx;
}
/**
* Open the Attribute database. If it cannot be opened, try to create a new
* instance of the database. If it cannot be created, throw an exception to
* signal the failure
*
* @return this (self reference, allowing this to be chained in an
* initialization call)
* @throws SQLException if the database could be neither opened or created
*/
public FieldDbAdapter open() throws SQLException {
mDbHelper = new DatabaseHelper(mCtx);
mDb = mDbHelper.getWritableDatabase();
return this;
}
public void close() {
mDbHelper.close();
}
/**
* Create a new Attribute using name, rsID and type provided. If the Attribute is
* successfully created return the new rowId for that note, otherwise return
* a -1 to indicate failure.
*
* @param rsID the rsID of the Attribute
* @param name the name of the Attribute
* @param type the type of the Attribute
* @return rowId or -1 if failed
*/
public long createAttribute(long rsID, String name, String type) {
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_RS, rsID);
initialValues.put(NAME , name);
initialValues.put(TYPE , type);
return mDb.insert(DATABASE_TABLE, null, initialValues);
}
/**
* Delete the Attribute with the given rowId
*
* @param rowId id of Attribute to delete
* @return true if deleted, false otherwise
*/
public boolean deleteAttribute(long rowId) {
return mDb.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0;
}
/**
* Remove attributes from a researchType by ID
*
*/
public int deleteAttributes(long rsId) {
return mDb.delete(DATABASE_TABLE, KEY_RS + "=" + rsId, null);
}
/**
* Return a Cursor positioned at the Attribute that belongs to the given attId
*
* @param attId id of Attribute to retrieve
* @return Cursor positioned to matching note, if found
* @throws SQLException if note could not be found/retrieved
*/
public Cursor fetchAtribute(long attId) throws SQLException {
return mDb.query(DATABASE_TABLE, new String[] {KEY_ROWID, KEY_RS,
NAME,TYPE}, KEY_ROWID + "=" + attId, null, null, null, null);
}
/**
* Return a Cursor positioned at the Attributes list that belongs to the given rsID
*
* @param rowId id of Attribute to retrieve
* @return Cursor positioned to matching note, if found
* @throws SQLException if note could not be found/retrieved
*/
public Cursor fetchAttributesFromRs(long rsId) throws SQLException {
return mDb.query(DATABASE_TABLE, new String[] {KEY_ROWID, KEY_RS,
NAME,TYPE}, KEY_RS + "=" + rsId, null, null, null, null);
}
}