No such as table: Name kotlin SQLite - sqlite

Question

I have got an error about no such talbe: Account while I am calling data from database.
My database name is "account.db" and table name is "Account". There are two columns, first is "name" and second is "email".
I am writing in kotlin language. Please look at below for my DBHelper and DBManager.
import android.content.Context
import android.database.Cursor
import android.database.sqlite.SQLiteDatabase
import android.database.sqlite.SQLiteOpenHelper
import android.os.Build
import android.widget.Toast
import java.io.FileOutputStream
import java.io.IOException
import java.lang.Exception
import java.util.ArrayList
class DbManager {
var DB_PATH = ""
var DB_NAME = "account.db"
val dbVersion = 1
//CREATE TABLE IF NOT EXISTS MyNotes (ID INTEGER PRIMARY KEY,title TEXT, Description TEXT);"
// val sqlCreateTable = "CREATE TABLE IF NOT EXISTS " + dbTable + " (" + colID + " INTEGER PRIMARY KEY," +
// colTitle + " TEXT, " + colDes + " TEXT);"
var sqlDB: SQLiteDatabase? = null
constructor(context: Context) {
var db = DBHelper(context)
sqlDB = db.writableDatabase
}
inner class DBHelper(context: Context) : SQLiteOpenHelper(context, DB_NAME, null, dbVersion) {
var mDatabase: SQLiteDatabase? = null
var mContext: Context? = null
//Todo: Get All Data users
fun getAllUsers(): List<Account>?{
val temp = ArrayList<Account>()
val db = writableDatabase
var c: Cursor?
try {
c = db.rawQuery("SELECT * FROM Account ", null)
if (c == null) return null
c.moveToFirst()
do {
val account = Account(c.getString(c.getColumnIndex("name")), c.getString(c.getColumnIndex("email")))
temp.add(account)
} while (c.moveToNext())
c.close()
} catch (e: Exception) {
}
db.close()
return temp
}
fun createDataBase() {
//Todo: Create Database
val isDBExist = checkDataBase()
if (isDBExist) { } else {
this.readableDatabase
try {
copyDataBase()
Toast.makeText(this.mContext, "Copy has been finished.", Toast.LENGTH_SHORT).show()
} catch (ex: Exception) {
}
}
}
init {
if (Build.VERSION.SDK_INT > 17) {
DB_PATH = context.applicationInfo.dataDir + "/databases/"
} else {
DB_PATH = "/data/data/" + context.packageName + "/databases/"
}
this.mContext = mContext
}
override fun close() {
if (mDatabase != null)
mDatabase!!.close()
super.close()
}
fun checkDataBase(): Boolean {
//Todo: Check Database
var tempDB: SQLiteDatabase? = null
try {
val path = DB_PATH + DB_NAME
tempDB = SQLiteDatabase.openDatabase(path, null, SQLiteDatabase.OPEN_READONLY)
} catch (ex: Exception) {
}
if (tempDB != null)
tempDB.close()
return if (tempDB != null) true else false
}
fun copyDataBase() {
//Todo:Copy Database
try {
val myInput = mContext!!.assets.open(DB_NAME)
val outputFileName = DB_PATH + DB_NAME
val myOutput = FileOutputStream(outputFileName)
val buffer = ByteArray(1024)
var length: Int
length= myInput.read(buffer)
while (length > 0) {
myOutput.write(buffer, 0, length)
}
myOutput.flush()
myOutput.close()
myInput.close()
} catch (e: IOException) {
e.printStackTrace()
}
}
fun openDataBase() {
//Todo: Open Database
val path = DB_PATH + DB_NAME
mDatabase = SQLiteDatabase.openDatabase(path, null, SQLiteDatabase.OPEN_READWRITE)
}
override fun onCreate(db: SQLiteDatabase) {
createDataBase()
}
override fun onUpgrade(db: SQLiteDatabase, oldVersion: Int, newVersion: Int) {
if(oldVersion>=newVersion){
copyDataBase()
}
}
// companion object {
// var DB_PATH = ""
// var DB_NAME = "account.db"
// }
}
}
Here is my MainActivity.kt
import android.content.Context
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.BaseAdapter
import android.widget.Button
import android.widget.LinearLayout
import android.widget.TextView
import kotlinx.android.synthetic.main.activity_main.*
import kotlinx.android.synthetic.main.row.*
import kotlinx.android.synthetic.main.row.view.*
import java.util.ArrayList
class MainActivity : AppCompatActivity() {
var lstUsers=ArrayList<Account>()
lateinit var dbHelper: DBHelper
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
dbHelper = DBHelper(applicationContext)
dbHelper.createDataBase()
}
fun buGetData(v: View){
//Todo: Load Data from db set to listview
LoadData()
}
fun LoadData(){
val accout = dbHelper.getAllUsers()
//this.listView.removeAllViews()
//List View
for (list in accout!!) {
lstUsers.add(list)
}
var myNotesAdapter= MyAdapter(this, lstUsers)
listView.adapter=myNotesAdapter
}
inner class MyAdapter:BaseAdapter {
var listMyAdapter = ArrayList<Account>()
var context:Context?=null
constructor(context:Context, listMyAdapter:ArrayList<Account>):super(){
this.listMyAdapter=listMyAdapter
this.context=context
}
override fun getView(position: Int, convertView: View?, parent: ViewGroup?): View {
var myView=layoutInflater.inflate(R.layout.row,null)
var myAc=listMyAdapter[position]
myView.txtUser.text = myAc.userName
myView.txtEmail.text = myAc.email
return myView
}
override fun getItem(position: Int): Any {
return listMyAdapter[position]
}
override fun getItemId(position: Int): Long {
return position.toLong()
}
override fun getCount(): Int {
return listMyAdapter.size
}
}
}
The error has shown like the picture below.
Please help me to solve it. Best regards, Sai Tawng Pha

Answer 1

I have solved my problem with update a few line of code. I want to share for other people.
If some one want to read exist Database file from Assests folder with Kotlin. Please have look below.
MainActivity.kt
import android.content.Context
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.widget.Button
import android.widget.LinearLayout
import android.widget.TextView
import kotlinx.android.synthetic.main.activity_main.*
import kotlinx.android.synthetic.main.row.*
import kotlinx.android.synthetic.main.row.view.*
import java.util.ArrayList
class MainActivity : AppCompatActivity() {
var lstUsers=ArrayList<Account>()
var dbHelper: DBHelper? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
dbHelper = DBHelper(this)
dbHelper!!.createDatabase()
}
fun buGetData(v: View){
lstUsers = this.dbHelper!!.getAllUsers() as ArrayList<Account>
this.container.removeAllViews()
//List View
for (account in lstUsers) {
// val inflater = baseContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
// val addView = inflater.inflate(R.layout.row, null)
var addView = layoutInflater.inflate(R.layout.row,null)
addView.txtUser.text = account.userName
addView.txtEmail.text = account.email
//add View
container.addView(addView)
}
}
}
DBHelper.kt
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.os.Build;
import android.util.Log;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
public class DbHelper extends SQLiteOpenHelper {
private static String DB_PATH= "";
private static String DB_NAME= "account.db";
private SQLiteDatabase mDatabase;
private final Context mContext;
public DbHelper(Context context) {
super(context, DB_NAME, null, 11);
this.mContext = context;
if(Build.VERSION.SDK_INT >= 17){
this.DB_PATH = context.getApplicationInfo().dataDir+"/databases/";
Log.e("Path:", DB_PATH);
}else {
this.DB_PATH = "/data/data/"+context.getPackageName()+"/databases/";
Log.e("Path:", DB_PATH);
}
}
#Override
public synchronized void close() {
if(mDatabase != null){
mDatabase.close();
}
super.close();
}
private boolean checkDatabase(){
//Todo: Check Database
SQLiteDatabase tempDB = null;
try {
String path = DB_PATH+DB_NAME;
tempDB = SQLiteDatabase.openDatabase(path, null, SQLiteDatabase.OPEN_READONLY);
}catch (Exception ex){}
if(tempDB!=null){
tempDB.close();
}
return tempDB!=null?true:false;
}
public void copyDatabase(){
//Todo: Copy Database
try {
InputStream myInput = mContext.getAssets().open(DB_NAME);
String outputFileName = DB_PATH+DB_NAME;
OutputStream myOutput = new FileOutputStream(outputFileName);
byte[] buffer = new byte[1024];
int length;
while ((length=myInput.read(buffer))>0){
myOutput.write(buffer,0,length);
}
myOutput.flush();
myOutput.close();
myInput.close();
} catch (IOException e) {
e.printStackTrace();
}
}
public void openDatabase(){
//Todo: Open Database
String path = DB_PATH+DB_NAME;
mDatabase = SQLiteDatabase.openDatabase(path,null, SQLiteDatabase.OPEN_READWRITE);
}
public void createDatabase(){
//Todo: Create Database
boolean isDBExist = checkDatabase();
if (isDBExist){
}else {
this.getReadableDatabase();
try {
copyDatabase();
}catch (Exception e){throw new Error("Copy Database Error");}
}
}
public List<Account>getAllUsers(){
//Todo: Get All Users
List<Account> temp = new ArrayList<Account>();
SQLiteDatabase db = this.getWritableDatabase();
Cursor c;
try {
c = db.rawQuery("SELECT * FROM Account", null);
if (c==null) return null;
c.moveToFirst();
do {
Account account = new Account(c.getString(c.getColumnIndex("name")),(c.getString(c.getColumnIndex("email"))));
temp.add(account);
}while (c.moveToNext());
c.close();
}catch (Exception e){}
db.close();
return temp;
}
#Override
public void onCreate(SQLiteDatabase db) {
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
main_activity.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<Button
android:id="#+id/buGetData"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:text="Get Data" />
<LinearLayout
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/buGetData"
android:layout_centerHorizontal="true"
android:layout_marginTop="-15dp"
android:orientation="vertical"></LinearLayout>
</RelativeLayout>
row.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/txtUserName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="5dp"
android:text="TextView"
android:textSize="18sp" />
<TextView
android:id="#+id/txtEmail"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="5dp"
android:text="TextView" />
</LinearLayout>
Please look the screenshot below.
Note: Please replace your Database file from Assets folder and change the name of your database name and table name from DBHelper.kt at createDataBase Function.
I hope, it will be useful for you.