Question
https://stackoverflow.com/questions/21313280
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Russianpackage com.example.myfirstapp;
public class DB_Moshtari {
/******************** if debug is set true then it will show all Logcat message ************/
public static final boolean DEBUG = true;
/******************** Logcat TAG ************/
public static final String LOG_TAG = "DBMoshtari";
/******************** Table Fields ************/
public static final String KEY_ID = "_id";
public static final String KEY_Moshtari_NAME = "Moshtari_name";
public static final String KEY_Moshtari_ADDRES = "Moshtari_addres";
public static final String KEY_Moshtari_tel = "Moshtari_tel";
/******************** Database Name ************/
public static final String DATABASE_NAME = "DB_sqllite";
/******************** Database Version (Increase one if want to also upgrade your database) ************/
public static final int DATABASE_VERSION = 1;// started at 1
/** Table names */
public static final String Moshtari_TABLE = "tbl_Moshtari";
/******************** Set all table with comma seperated like Moshtari_TABLE,ABC_TABLE ************/
private static final String[] ALL_TABLES = { Moshtari_TABLE };
/** Create table syntax */
private static final String Moshtari_CREATE = "create table tbl_Moshtari(_id integer primary key autoincrement," +
" Moshtari_name text not null, Moshtari_addres text not null,Moshtari_tel text not null);";
/******************** Used to open database in syncronized way ************/
private static DataBaseHelper DBHelper = null;
protected DB_Moshtari() {
// TODO Auto-generated constructor stub
}
/******************* Initialize database *************/
public static void init(Context context) {
if (DBHelper == null) {
if (DEBUG)
Log.i("DBMoshtari", context.toString());
DBHelper = new DataBaseHelper(context);
}
}
/********************** Main Database creation INNER class ********************/
private static class DataBaseHelper extends SQLiteOpenHelper {
public DataBaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
if (DEBUG)
Log.i(LOG_TAG, "new create");
try {
db.execSQL(Moshtari_CREATE);
} catch (Exception exception) {
if (DEBUG)
Log.i(LOG_TAG, "Exception onCreate() exception");
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
if (DEBUG)
Log.w(LOG_TAG, "Upgrading database from version" + oldVersion
+ "to" + newVersion + "...");
for (String table : ALL_TABLES) {
db.execSQL("DROP TABLE IF EXISTS " + table);
}
onCreate(db);
}
} // Inner class closed
/********************** Open database for insert,update,delete in syncronized manner ********************/
private static synchronized SQLiteDatabase open() throws SQLException {
return DBHelper.getWritableDatabase();
}
/************************ General functions**************************/
/*********************** Escape string for single quotes (Insert,Update)************/
private static String sqlEscapeString(String aString) {
String aReturn = "";
if (null != aString) {
//aReturn = aString.replace("'", "''");
aReturn = DatabaseUtils.sqlEscapeString(aString);
// Remove the enclosing single quotes ...
aReturn = aReturn.substring(1, aReturn.length() - 1);
}
return aReturn;
}
/*********************** UnEscape string for single quotes (show data)************/
private static String sqlUnEscapeString(String aString) {
String aReturn = "";
if (null != aString) {
aReturn = aString.replace("''", "'");
}
return aReturn;
}
/********************************************************************/
/**
* All Operations (Create, Read, Update, Delete)
* @param <MoshtariData>
*/
// Adding new contact
public static void addMoshtariData(Moshtari mData) {
final SQLiteDatabase db = open();
String name = sqlEscapeString(mData.getName());
String addres = sqlEscapeString(mData.getAddress());
String tel = sqlEscapeString(mData.getTel());
ContentValues cVal = new ContentValues();
cVal.put(KEY_Moshtari_NAME, name);
cVal.put(KEY_Moshtari_ADDRES, addres);
cVal.put(KEY_Moshtari_tel, tel );
db.insert(Moshtari_TABLE, null, cVal);
db.close(); // Closing database connection
}
// Getting single contact
public static Moshtari getMoshtariData(int id) {
final SQLiteDatabase db = open();
Cursor cursor = db.query(Moshtari_TABLE, new String[] { KEY_ID,
KEY_Moshtari_NAME, KEY_Moshtari_ADDRES,KEY_Moshtari_tel }, KEY_ID + "=?",
new String[] { String.valueOf(id) }, null, null, null, null);
if (cursor != null)
cursor.moveToFirst();
Moshtari data = new Moshtari(Integer.parseInt(cursor.getString(0)),
cursor.getString(1), cursor.getString(2), cursor.getString(3));
// return contact
return data;
}
// Getting All Contacts
public static List<Moshtari> getAllMoshtariData() {
List<Moshtari> contactList = new ArrayList<Moshtari>();
// Select All Query
String selectQuery = "SELECT * FROM " + Moshtari_TABLE;
final SQLiteDatabase db = open();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Moshtari data = new Moshtari();
data.setId(Integer.parseInt(cursor.getString(0)));
data.setName(cursor.getString(1));
data.setAddress(cursor.getString(2));
data.setTel(cursor.getString(3));
// Adding contact to list
contactList.add(data);
} while (cursor.moveToNext());
}
// return contact list
return contactList;
}
// Updating single contact
public static int updateMoshtariData(Moshtari data) {
final SQLiteDatabase db = open();
ContentValues values = new ContentValues();
values.put(KEY_Moshtari_NAME, data.getName());
values.put(KEY_Moshtari_ADDRES, data.getAddress());
values.put(KEY_Moshtari_tel, data.getTel());
// updating row
return db.update(Moshtari_TABLE, values, KEY_ID + " = ?",
new String[] { String.valueOf(data.getId()) });
}
// Deleting single contact
public static void deleteMoshtariData(Moshtari data) {
final SQLiteDatabase db = open();
db.delete(Moshtari_TABLE, KEY_ID + " = ?",
new String[] { String.valueOf(data.getId()) });
db.close();
}
// Getting contacts Count
public static int getMoshtariDataCount() {
String countQuery = "SELECT * FROM " + Moshtari_TABLE;
final SQLiteDatabase db = open();
Cursor cursor = db.rawQuery(countQuery, null);
cursor.close();
// return count
return cursor.getCount();
}
}
package com.example.myfirstapp;
public class DB_Taminkonande {
/******************** if debug is set true then it will show all Logcat message ************/
public static final boolean DEBUG = true;
/******************** Logcat TAG ************/
public static final String LOG_TAG = "DBTaminkonande";
/******************** Table Fields ************/
public static final String KEY_ID = "_id";
public static final String KEY_Taminkonande_NAME = "Taminkonande_name";
public static final String KEY_Taminkonande_ADDRES = "Taminkonande_addres";
public static final String KEY_Taminkonande_tel = "Taminkonande_tel";
/******************** Database Name ************/
public static final String DATABASE_NAME = "DB_sqllite";
/******************** Database Version (Increase one if want to also upgrade your database) ************/
public static final int DATABASE_VERSION = 1;// started at 1
/** Table names */
public static final String Taminkonande_TABLE = "tbl_Taminkonande";
/******************** Set all table with comma seperated like Taminkonande_TABLE,ABC_TABLE ************/
private static final String[] ALL_TABLES = { Taminkonande_TABLE };
/** Create table syntax */
private static final String Taminkonande_CREATE = "create table tbl_Taminkonande(_id integer primary key autoincrement," +
" Taminkonande_name text not null, Taminkonande_addres text not null,Taminkonande_tel text not null);";
/******************** Used to open database in syncronized way ************/
private static DataBaseHelper DBHelper = null;
protected DB_Taminkonande() {
// TODO Auto-generated constructor stub
}
/******************* Initialize database *************/
public static void init(Context context) {
if (DBHelper == null) {
if (DEBUG)
Log.i("DBTaminkonande", context.toString());
DBHelper = new DataBaseHelper(context);
}
}
/********************** Main Database creation INNER class ********************/
private static class DataBaseHelper extends SQLiteOpenHelper {
public DataBaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
if (DEBUG)
Log.i(LOG_TAG, "new create");
try {
db.execSQL(Taminkonande_CREATE);
} catch (Exception exception) {
if (DEBUG)
Log.i(LOG_TAG, "Exception onCreate() exception");
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
if (DEBUG)
Log.w(LOG_TAG, "Upgrading database from version" + oldVersion
+ "to" + newVersion + "...");
for (String table : ALL_TABLES) {
db.execSQL("DROP TABLE IF EXISTS " + table);
}
onCreate(db);
}
} // Inner class closed
/********************** Open database for insert,update,delete in syncronized manner ********************/
private static synchronized SQLiteDatabase open() throws SQLException {
return DBHelper.getWritableDatabase();
}
/************************ General functions**************************/
/*********************** Escape string for single quotes (Insert,Update)************/
private static String sqlEscapeString(String aString) {
String aReturn = "";
if (null != aString) {
//aReturn = aString.replace("'", "''");
aReturn = DatabaseUtils.sqlEscapeString(aString);
// Remove the enclosing single quotes ...
aReturn = aReturn.substring(1, aReturn.length() - 1);
}
return aReturn;
}
/*********************** UnEscape string for single quotes (show data)************/
private static String sqlUnEscapeString(String aString) {
String aReturn = "";
if (null != aString) {
aReturn = aString.replace("''", "'");
}
return aReturn;
}
/********************************************************************/
/**
* All Operations (Create, Read, Update, Delete)
* @param <TaminkonandeData>
*/
// Adding new contact
public static void addTaminkonandeData(Taminkonande mData) {
final SQLiteDatabase db = open();
String name = sqlEscapeString(mData.getName());
String addres = sqlEscapeString(mData.getAddress());
String tel = sqlEscapeString(mData.getTel());
ContentValues cVal = new ContentValues();
cVal.put(KEY_Taminkonande_NAME, name);
cVal.put(KEY_Taminkonande_ADDRES, addres);
cVal.put(KEY_Taminkonande_tel, tel );
db.insert(Taminkonande_TABLE, null, cVal);
db.close(); // Closing database connection
}
// Getting single contact
public static Taminkonande getTaminkonandeData(int id) {
final SQLiteDatabase db = open();
Cursor cursor = db.query(Taminkonande_TABLE, new String[] { KEY_ID,
KEY_Taminkonande_NAME, KEY_Taminkonande_ADDRES,KEY_Taminkonande_tel }, KEY_ID + "=?",
new String[] { String.valueOf(id) }, null, null, null, null);
if (cursor != null)
cursor.moveToFirst();
Taminkonande data = new Taminkonande(Integer.parseInt(cursor.getString(0)),
cursor.getString(1), cursor.getString(2), cursor.getString(3));
// return contact
return data;
}
// Getting All Contacts
public static List<Taminkonande> getAllTaminkonandeData() {
List<Taminkonande> contactList = new ArrayList<Taminkonande>();
// Select All Query
String selectQuery = "SELECT * FROM " + Taminkonande_TABLE;
final SQLiteDatabase db = open();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Taminkonande data = new Taminkonande();
data.setId(Integer.parseInt(cursor.getString(0)));
data.setName(cursor.getString(1));
data.setAddress(cursor.getString(2));
data.setTel(cursor.getString(3));
// Adding contact to list
contactList.add(data);
} while (cursor.moveToNext());
}
// return contact list
return contactList;
}
// Updating single contact
public static int updateTaminkonandeData(Taminkonande data) {
final SQLiteDatabase db = open();
ContentValues values = new ContentValues();
values.put(KEY_Taminkonande_NAME, data.getName());
values.put(KEY_Taminkonande_ADDRES, data.getAddress());
values.put(KEY_Taminkonande_tel, data.getTel());
// updating row
return db.update(Taminkonande_TABLE, values, KEY_ID + " = ?",
new String[] { String.valueOf(data.getId()) });
}
// Deleting single contact
public static void deleteTaminkonandeData(Taminkonande data) {
final SQLiteDatabase db = open();
db.delete(Taminkonande_TABLE, KEY_ID + " = ?",
new String[] { String.valueOf(data.getId()) });
db.close();
}
// Getting contacts Count
public static int getTaminkonandeDataCount() {
String countQuery = "SELECT * FROM " + Taminkonande_TABLE;
final SQLiteDatabase db = open();
Cursor cursor = db.rawQuery(countQuery, null);
cursor.close();
// return count
return cursor.getCount();
}
}
i have this two classes , when i install my app and use one of this classes , the other class will not work, for example i add Moshtari in my DB_Moshtari , then go for another means DB_Taminkonande to add a row in it , it says "no such tbl_Taminkonande"
Solution
For the first time when you install app and use DB_Moshtari, Android OS creates database and creates table Moshtari_CREATE only. Next time, when you try to run DB_Taminkonande created (same database name is specified) onCreate() method is not called. Hence, table no such tbl_Taminkonande exception.
The approach is not good, please change the approach.
