I want to interact with my Sqlite Database for my Android project. I put this database in my assets and at the beginning the database is copied in my application folder : "/data/data/com.company.sqlitetutorial/databases/" here all is working fine, but when I want to do some interaction with it like inserting a new line or getting any information from it, I already have an SQLiteLog: (1) no such table :"anytable" error. I tried to change the version of the database, nothing new happen, I tried to create my database and interact with it directly it works perfectly, so I didn't understand why when I use a preconfig database it doesn't work, can you help me please ?
here is the code for my Main activity :
package com.company.sqlitetutorial;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/** Called when the activity is first created. */
LivresBDD livreBdd = new LivresBDD(this);
Livre livre = new Livre("123456789", "number 1");
Livre livre2 = new Livre("123456733", "number 2");
Livre livre3 = new Livre("123456229", "number 3");
livreBdd.open();
livreBdd.insertLivre(livre);
livreBdd.insertLivre(livre2);
livreBdd.insertLivre(livre3);
Livre livreFromBdd = livreBdd.getLivreWithTitre(livre.getTitre());
if(livreFromBdd != null){
Toast.makeText(this, livreFromBdd.toString(), Toast.LENGTH_LONG).show();
livreFromBdd.setTitre("book modified");
livreBdd.updateLivre(livreFromBdd.getId(), livreFromBdd);
}
livreFromBdd = livreBdd.getLivreWithTitre("book modified");
if(livreFromBdd != null){
Toast.makeText(this, livreFromBdd.toString(), Toast.LENGTH_LONG).show();
}
livreFromBdd = livreBdd.getLivreWithTitre("book modified");
if(livreFromBdd == null){
}
else{
Toast.makeText(this, "book modified is here", Toast.LENGTH_LONG).show();
}
livreBdd.getAllBooks();
livreBdd.close();
}
}
LivresBDD for managed the database
package com.company.sqlitetutorial;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import java.io.IOException;
import java.util.ArrayList;
public class LivresBDD {
private static final int VERSION_BDD = 2;
private static final String NOM_BDD = "eleves.db";
private static final String TABLE_LIVRES = "table_livres";
private static final String COL_ID = "ID";
private static final int NUM_COL_ID = 0;
private static final String COL_ISBN = "ISBN";
private static final int NUM_COL_ISBN = 1;
private static final String COL_TITRE = "Titre";
private static final int NUM_COL_TITRE = 2;
private SQLiteDatabase bdd;
private MaBaseSQLite maBaseSQLite;
public LivresBDD(Context context){
maBaseSQLite = new MaBaseSQLite(context, NOM_BDD, null, VERSION_BDD);
try {
maBaseSQLite.createDataBase(context);
} catch (IOException mE) {
mE.printStackTrace();
}
}
public void open(){
bdd = maBaseSQLite.getWritableDatabase();
}
public void close(){
bdd.close();
}
public SQLiteDatabase getBDD(){
return bdd;
}
public long insertLivre(Livre livre){
ContentValues values = new ContentValues();
values.put(COL_ISBN, livre.getIsbn());
values.put(COL_TITRE, livre.getTitre());
return bdd.insert(TABLE_LIVRES, null, values);
}
public int updateLivre(int id, Livre livre){
ContentValues values = new ContentValues();
values.put(COL_ISBN, livre.getIsbn());
values.put(COL_TITRE, livre.getTitre());
return bdd.update(TABLE_LIVRES, values, COL_ID + " = " +id, null);
}
public int removeLivreWithID(int id){
return bdd.delete(TABLE_LIVRES, COL_ID + " = " +id, null);
}
public Livre getLivreWithTitre(String titre){
Cursor c = bdd.query(TABLE_LIVRES, new String[] {COL_ID, COL_ISBN, COL_TITRE}, COL_TITRE + " LIKE \"" + titre +"\"", null, null, null, null);
return cursorToLivre(c);
}
public ArrayList<String> getAllBooks(){
Cursor mCursor = bdd.rawQuery("SELECT * FROM "+TABLE_LIVRES,null);
ArrayList<String> list = new ArrayList<>();
if (mCursor.moveToFirst()) {
while (mCursor.isAfterLast() == false) {
String name = mCursor.getString(2);
list.add(name);
mCursor.moveToNext();
}
}
if(list != null){
for (int i = 0; i < list.size(); i++) {
System.out.println("list.get(i) = " + list.get(i));
}
}
return list;
}
private Livre cursorToLivre(Cursor c){
if (c.getCount() == 0)
return null;
c.moveToFirst();
Livre livre = new Livre();
livre.setId(c.getInt(NUM_COL_ID));
livre.setIsbn(c.getString(NUM_COL_ISBN));
livre.setTitre(c.getString(NUM_COL_TITRE));
c.close();
return livre;
}
}
This is the class to copy, open the database :
package com.company.sqlitetutorial;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import android.widget.Toast;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class MaBaseSQLite extends SQLiteOpenHelper {
private static final String TABLE_LIVRES = "table_livres";
private static final String COL_ID = "ID";
private static final String COL_ISBN = "ISBN";
private static final String COL_TITRE = "Titre";
private static String DB_PATH = "/data/data/com.company.sqlitetutorial/databases/";
private static String DB_NAME = "";
private static final String CREATE_BDD = "CREATE TABLE " + TABLE_LIVRES + " ("
+ COL_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + COL_ISBN + " TEXT NOT NULL, "
+ COL_TITRE + " TEXT NOT NULL);";
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 MaBaseSQLite(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
super(context,name, factory, version);
this.myContext = context;
DB_NAME = name;
}
/**
* Creates a empty database on the system and rewrites it with your own database.
* */
public void createDataBase(Context context) throws IOException {
boolean dbExist = checkDataBase();
if(dbExist){
//do nothing - database already exist
Toast.makeText(context, "La BDD existe", Toast.LENGTH_LONG).show();
}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 {
Toast.makeText(context, "Copy database", Toast.LENGTH_LONG).show();
copyDataBase();
} catch (IOException e) {
e.printStackTrace();
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);
System.out.println("check database");
}catch(SQLiteException e){
//database does't exist yet.
e.printStackTrace();
}
if(checkDB != null){
checkDB.close();
}
System.out.println("checkDB "+checkDB);
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{
System.out.println("begin COPY");
Log.i("Database",
"New database is being copied to device!");
byte[] buffer = new byte[1024];
OutputStream myOutput;
int length;
// Open your local db as the input stream
InputStream myInput;
try
{
myInput =myContext.getAssets().open(DB_NAME);
// transfer bytes from the inputfile to the
// outputfile
myOutput =new FileOutputStream(DB_PATH+ DB_NAME);
while((length = myInput.read(buffer)) > 0)
{
myOutput.write(buffer, 0, length);
}
myOutput.close();
myOutput.flush();
myInput.close();
Log.i("Database",
"New database has been copied to device!");
System.out.println("close COPY");
}
catch(IOException e)
{
e.printStackTrace();
}
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
The last class :
package com.company.sqlitetutorial;
public class Livre {
private int id;
private String isbn;
private String titre;
public Livre(){}
public Livre(String isbn, String titre){
this.isbn = isbn;
this.titre = titre;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getIsbn() {
return isbn;
}
public void setIsbn(String isbn) {
this.isbn = isbn;
}
public String getTitre() {
return titre;
}
public void setTitre(String titre) {
this.titre = titre;
}
public String toString(){
return "ID : "+id+"\nISBN : "+isbn+"\nTitre : "+titre;
}
}
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