/*
* 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.SQLiteConstraintException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
/**
* Simple notes database access helper class. Defines the basic CRUD operations
* for the notepad example, and gives the ability to list all notes as well as
* retrieve or modify a specific note.
*
* This has been improved from the first version of this tutorial through the
* addition of better error handling and also using returning a Cursor instead
* of using a collection of inner classes (which is less scalable and not
* recommended).
*/
public class ResearchDbAdapter {
public static final String KEY_ROWID = "_id";
public static final String NAME = "name";
public static final String DESCRIPTION = "description";
public static final String TYPE = "type";
private static final String TAG = "ResearchDbAdapter";
private DatabaseHelper mDbHelper;
private SQLiteDatabase mDb;
/**
* Database creation sql statement
*/
private static final String DATABASE_NAME = "mobileSamplingRs";
private static final String DATABASE_TABLE = "Research";
private static final int DATABASE_VERSION = 2;
private static final String DATABASE_CREATE =
"create table "+DATABASE_TABLE+" ("
+ KEY_ROWID + " INTEGER PRIMARY KEY,"
+ NAME + " TEXT UNIQUE,"
+ DESCRIPTION + " TEXT,"
+ TYPE+ " TEXT"
+ ");";
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 ResearchDbAdapter(Context ctx) {
this.mCtx = ctx;
}
/**
* Open the Research 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 ResearchDbAdapter open() throws SQLException {
mDbHelper = new DatabaseHelper(mCtx);
mDb = mDbHelper.getWritableDatabase();
return this;
}
public void close() {
mDbHelper.close();
}
public void deleteDatabase() {
mDbHelper.close();
mDb.close();
if (mCtx.deleteDatabase(DATABASE_NAME)) {
Log.d(TAG, "deleteDatabase(): database deleted.");
} else {
Log.d(TAG, "deleteDatabase(): database NOT deleted.");
}
}
/**
* Create a new Research using the name and description provided. If the Research is
* successfully created return the new rowId for that Research, otherwise return
* a -1 to indicate failure.
*
* @param name the name of the Research
* @param body the description of the Research
* @return rowId or -1 if failed
*/
public long createResearch(String name, String description) {
ContentValues initialValues = new ContentValues();
initialValues.put(NAME , name);
initialValues.put(DESCRIPTION , description);
long result=0;
try{
result=mDb.insert(DATABASE_TABLE, null, initialValues);
}
catch (SQLiteConstraintException sqle){
result=-1;
}
catch(Exception exception) {
int i=0;
i++;
}
return result;
}
/**
* Delete the Research with the given rowId
*
* @param rowId id of Research to delete
* @return true if deleted, false otherwise
*/
public boolean deleteResearch(long rowId) {
return mDb.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0;
}
/**
* Return a Cursor over the list of all Researches in the database
*
* @return Cursor over all notes
*/
public Cursor fetchAllResearches() {
return mDb.query(DATABASE_TABLE, new String[] {KEY_ROWID, NAME,DESCRIPTION}, null, null, null, null, NAME + " ASC");
}
/**
* Return a Cursor positioned at the Research that matches the given rowId
*
* @param rowId id of Research to retrieve
* @return Cursor positioned to matching Research, if found
* @throws SQLException if Research could not be found/retrieved
*/
public Cursor fetchResearch(long rowId) throws SQLException {
Cursor mCursor =
mDb.query(true, DATABASE_TABLE, new String[] {KEY_ROWID,
NAME,DESCRIPTION}, KEY_ROWID + "=" + rowId, null,
null, null, null, null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
/**
* Return a Cursor positioned at the Research that matches the given rsName
*
* @param rowId id of Research to retrieve
* @return Cursor positioned to matching Research, if found
* @throws SQLException if Research could not be found/retrieved
*/
public Cursor fetchResearchByName(String name) throws SQLException {
Cursor mCursor =
mDb.query(true, DATABASE_TABLE, new String[] {KEY_ROWID,
NAME,DESCRIPTION}, NAME + "='" + name+"'", null,
null, null, null, null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
public Cursor fetchResearchByTh(String thName) throws SQLException {
Cursor mCursor =
mDb.query(true, DATABASE_TABLE, new String[] {KEY_ROWID,
NAME,DESCRIPTION}, DESCRIPTION + "='" + thName+"'", null,
null, null, null, null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
public boolean updateRsTh(long rsId, String thName) {
ContentValues vals = new ContentValues();
vals.put(DESCRIPTION,thName);
return mDb.update(DATABASE_TABLE, vals, KEY_ROWID + "=" + rsId, null) > 0;
}
}