Mega Code Archive
Extends SQLiteOpenHelper
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//package nicolasb1.additifs;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
public class DataBaseHelper extends SQLiteOpenHelper {
//The Android's default system path of your application database.
private static String DB_PATH = "/data/data/nicolasb1.additifs/databases/";
private static String DB_NAME = "additifs.db";
public static final String KEY_ID = "_id";
public static final String KEY_EID = "eid";
public static final String KEY_COLOR = "color";
public static final String KEY_NAME = "name";
public static final String KEY_TYPE = "type";
public static final String KEY_NAME2 = "name2";
public static final String KEY_TYPE2 = "type2";
private static final int DATABASE_VERSION = 10;
private SQLiteDatabase myDataBase;
private final Context myContext;
/**
* Constructor
* Takes and keeps a reference of the passed context in order to access to the application assets and resources.
* @param context
*/
public DataBaseHelper(Context context) {
super(context, DB_NAME, null, DATABASE_VERSION);
this.myContext = context;
}
public SQLiteDatabase getdatabase(){
return this.myDataBase;
}
/**
* Creates a empty database on the system and rewrites it with your own database.
* */
public void createDataBase() throws IOException{
boolean dbExist = checkDataBase();
if(dbExist){
//Do nothing
this.getWritableDatabase();
}
dbExist = checkDataBase();
if(!dbExist){
//By calling this method and empty database will be created into the default system path
//of your application so we are gonna be able to overwrite that database with our database.
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
this.close();
}
/**
* Check if the database already exist to avoid re-copying the file each time you open the application.
* @return true if it exists, false if it doesn't
*/
private boolean checkDataBase(){
SQLiteDatabase checkDB = null;
try{
String myPath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.NO_LOCALIZED_COLLATORS);
int i = checkDB.getVersion();
int a = i;
}catch(SQLiteException e){
//database does't exist yet.
}
if(checkDB != null){
checkDB.close();
}
return checkDB != null ? true : false;
}
/**
* Copies your database from your local assets-folder to the just created empty database in the
* system folder, from where it can be accessed and handled.
* This is done by transfering bytestream.
* */
private void copyDataBase() throws IOException{
//Open your local db as the input stream
InputStream myInput = myContext.getAssets().open(DB_NAME);
// Path to the just created empty db
String outFileName = DB_PATH + DB_NAME;
//Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
//transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer))>0){
myOutput.write(buffer, 0, length);
}
//Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
}
public void openDataBase() throws SQLException{
//Open the database
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.NO_LOCALIZED_COLLATORS);
}
@Override
public synchronized void close() {
if(myDataBase != null)
myDataBase.close();
super.close();
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
myContext.deleteDatabase(DB_NAME);
}
public Cursor fetchByEID() {
// TODO Auto-generated method stub
return myDataBase.query("additifs", new String[] {KEY_ID, KEY_EID, KEY_COLOR, KEY_NAME, KEY_TYPE, KEY_NAME2, KEY_TYPE2}, null, null, null, null, "_id");
}
public Cursor fetchByName() {
// TODO Auto-generated method stub
return myDataBase.query("additifs", new String[] {KEY_ID, KEY_EID, KEY_COLOR, KEY_NAME, KEY_TYPE, KEY_NAME2, KEY_TYPE2}, null, null, null, null, "name");
}
public Cursor fetchByEID2() {
// TODO Auto-generated method stub
return myDataBase.query("additifs", new String[] {KEY_ID, KEY_EID, KEY_COLOR, KEY_NAME, KEY_TYPE, KEY_NAME2, KEY_TYPE2}, null, null, null, null, "_id");
}
public Cursor fetchByName2() {
// TODO Auto-generated method stub
return myDataBase.query("additifs", new String[] {KEY_ID, KEY_EID, KEY_COLOR, KEY_NAME, KEY_TYPE, KEY_NAME2, KEY_TYPE2}, null, null, null, null, "name2");
}
public Cursor fetchORANGE() {
// TODO Auto-generated method stub
return myDataBase.query("additifs", new String[] {KEY_ID, KEY_EID, KEY_COLOR, KEY_NAME, KEY_TYPE}, "color = 'ORANGE'", null, null, null, "_id");
}
public Cursor fetchRED() {
// TODO Auto-generated method stub
return myDataBase.query("additifs", new String[] {KEY_ID, KEY_EID, KEY_COLOR, KEY_NAME, KEY_TYPE}, "color = 'RED'", null, null, null, "_id");
}
// Add your public helper methods to access and get content from the database.
// You could return cursors by doing "return myDataBase.query(....)" so it'd be easy
// to you to create adapters for your views.
}
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