/
SongDbAdapter.java
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/
SongDbAdapter.java
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package com.songbook;
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;
import android.util.Log;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class SongDbAdapter extends SQLiteOpenHelper{
/* For Log.d messages */
private static final String TAG = "SongBook";
//The Android's default system path of your application database.
private static String DB_PATH = "/data/data/com.songbook/databases/";
private static String DB_NAME = "db";
private static String DB_TABLE = "songs";
public static final String KEY_ROWID = "_id";
public static final String KEY_TYPE = "type";
public static final String KEY_NUMBER = "number";
public static final String KEY_LYRICS = "lyrics";
public static final String KEY_INFO = "info";
public static final String TYPE_SIIONIN_LAULU = "SiioninLaulu";
public static final String TYPE_VIRSI = "Virsi";
public static final String TYPE_SHZ = "SHZ";
private SQLiteDatabase mDb;
private final Context mContext;
/**
* Constructor - takes the context to allow the database to be
* opened/created
*
* @param ctx the Context within which to work
*/
public SongDbAdapter(Context ctx) {
super(ctx, DB_NAME, null, 1);
this.mContext = ctx;
}
public void open(){
try {
createDatabase();
} catch (IOException ioe) {
throw new Error("Unable to create database");
}
try {
openDatabase();
}catch(SQLException sqle){
throw sqle;
}
}
/**
* Creates an empty database on the system and rewrites it with your own database.
* */
public void createDatabase() throws IOException{
//boolean dbExist = checkDatabase();
// Set this to false to regenerate db from split files
boolean dbExist = false;
if(dbExist){
//do nothing - database already exist
}else{
//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");
}
}
}
/**
* 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.OPEN_READONLY);
}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
/** File cannot be stored as a single database file because
* it exceeds the file size limit of 1048576 bytes.
*
* To get this to work use 'split db -b 1048576 split_db_' to split
* the database into 1048576 byte chunks named split_db_aa, split_db_ab, etc.
* Then the first time the program launches these chunks will be merged into
* a single database file in the system folder.
* */
InputStream dbFile1 = mContext.getAssets().open("split_db_aa");
InputStream dbFile2 = mContext.getAssets().open("split_db_ab");
// 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 = dbFile1.read(buffer))>0){
myOutput.write(buffer, 0, length);
}
while ((length = dbFile2.read(buffer))>0){
myOutput.write(buffer, 0, length);
}
//Close the streams
myOutput.flush();
myOutput.close();
dbFile1.close();
dbFile2.close();
}
public void openDatabase() throws SQLException{
//Open the database
String myPath = DB_PATH + DB_NAME;
mDb = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}
@Override
public synchronized void close() {
if(mDb != null) mDb.close();
super.close();
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
/**
* Return a Cursor over the list of all songs in the database
*
* @return Cursor over all songs
*/
public Cursor fetchAllSongs(boolean siioninLaulu, boolean virsi, boolean shz) {
return mDb.query(DB_TABLE,
new String[] {KEY_ROWID, KEY_NUMBER, KEY_LYRICS},
getTypeWhereClause(siioninLaulu, virsi, shz),
null, null, null, null);
}
public Cursor fetchSongsByNumber(int songNum,
boolean siioninLaulu, boolean virsi, boolean shz){
Cursor result;
try{
Log.d(TAG, "db query with songNum = " + songNum);
String queryStr = KEY_NUMBER + "=" + songNum + " AND ("
+ getTypeWhereClause(siioninLaulu, virsi, shz)
+ ")";
result = mDb.query(DB_TABLE,
new String[] {KEY_ROWID, KEY_TYPE, KEY_NUMBER, KEY_LYRICS, KEY_INFO},
queryStr,
null, null, null, null);
} catch (SQLiteException e){
Log.d(TAG, e.toString());
result = null;
}
return result;
}
public Cursor fetchSongsByString(String str, boolean siioninLaulu, boolean virsi, boolean shz){
Cursor result;
try{
String queryStr = "(" + KEY_LYRICS + " LIKE '%" + str + "%'" +
"OR " + KEY_INFO + " LIKE '%" + str + "%'" +
") AND (" + getTypeWhereClause(siioninLaulu, virsi, shz) + ")";
result = mDb.query(DB_TABLE,
new String[] {KEY_ROWID, KEY_TYPE, KEY_NUMBER, KEY_LYRICS, KEY_INFO},
queryStr,
null, null, null, null);
} catch (SQLiteException e){
Log.d(TAG, e.toString());
result = null;
}
return result;
}
private String getTypeWhereClause(boolean siioninLaulu, boolean virsi, boolean shz)
{
StringBuilder aTypeWhereBuilder = new StringBuilder();
boolean appendOr = false;
if (siioninLaulu)
{
aTypeWhereBuilder.append(KEY_TYPE).append("='").append(TYPE_SIIONIN_LAULU).append("'");
appendOr = true;
}
if (virsi)
{
if (appendOr)
{
aTypeWhereBuilder.append(" OR ");
}
aTypeWhereBuilder.append(KEY_TYPE).append("='").append(TYPE_VIRSI).append("'");
appendOr = true;
}
if (shz)
{
if (appendOr)
{
aTypeWhereBuilder.append(" OR ");
}
aTypeWhereBuilder.append(KEY_TYPE).append("='").append(TYPE_SHZ).append("'");
}
return aTypeWhereBuilder.toString();
}
}