Develop Reference

Want to create,update and retrieve data from SqLite

For Create table :
private static void createAllTables(SQLiteDatabase database) {
database.execSQL(" CREATE TABLE IF NOT EXISTS " + IN_RIDE_DATA + " (" + USER_ID + " REAL NOT NULL" +"," + TOTAL_DISPLACEMENT_DISTANCE + " REAL NOT NULL" + "" + ");");
}
for Update table, want to save only displacement so i update every time because i want to override the data.
public void insertTotalDisplacement(String userID, Double displacement) {
try {
ContentValues contentValues = new ContentValues();
contentValues.put(NewDatabaseForInRideData.USER_ID, userID); //User phone No used as a USER ID
contentValues.put(NewDatabaseForInRideData.TOTAL_DISPLACEMENT_DISTANCE, displacement);
database.update(NewDatabaseForInRideData.IN_RIDE_DATA,contentValues, NewDatabaseForInRideData.USER_ID+" = "+userID, new String [] {});
} catch (Exception e) {
e.printStackTrace();
}
}
For Retrieving data, I used several ways to do this but data not save in database and not retrieved from database.
public Cursor getTotalDisplacementDistance() {
Cursor cursor=null;
try {
String[] columns = new String[]{NewDatabaseForInRideData.TOTAL_DISPLACEMENT_DISTANCE};
// cursor = database.rawQuery(NewDatabaseForInRideData.IN_RIDE_DATA, columns, null, null, null, null, null);
//choice = String.valueOf(cursor.getDouble(cursor.getColumnIndex(NewDatabaseForInRideData.TOTAL_DISPLACEMENT_DISTANCE)));
Cursor cur=database.rawQuery("SELECT "+NewDatabaseForInRideData.TOTAL_DISPLACEMENT_DISTANCE+" where "+NewDatabaseForInRideData.USER_ID+" = " +1+ " from"+NewDatabaseForInRideData.IN_RIDE_DATA,new String [] {});
//Cursor cur=database.rawQuery("SELECT * from IN_RIDE_DATA",new String [] {});
if (cursor != null) {
cursor.moveToFirst();
}
return cursor;
} catch (Exception e) {
e.printStackTrace();
return cursor;
}
}

The issue is in getTotalDisplacementDistance method, you are using two cursor variables, one has query result and other is null, and you are processing the one with null value.
Update it accordingly,
public Cursor getTotalDisplacementDistance() {
Cursor cursor=null;
try {
cursor = database.rawQuery("SELECT " + NewDatabaseForInRideData.TOTAL_DISPLACEMENT_DISTANCE + " from IN_RIDE_DATA where " + NewDatabaseForInRideData.USER_ID + " = ?", new String[] {"1"});
if (cursor != null) {
cursor.moveToFirst();
}
return cursor;
} catch (Exception e) {
e.printStackTrace();
return cursor;
}
}

You can try this
String selectQuery = "SELECT * FROM " + IN_RIDE_DATA;
SQLiteDatabase db = dbHelper.getWritableDatabase();
db.beginTransaction();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Contact contact = new Contact();
contact.setID(Integer.parseInt(cursor.getString(cursor.getColumnIndex(NewDatabaseForInRideData.USER_ID))));
contact.setName(cursor.getString(cursor.getColumnIndex(NewDatabaseForInRideData.TOTAL_DISPLACEMENT_DISTANCE))));
// Adding data to your list
list.add(contact);
} while (cursor.moveToNext());
db.setTransactionSuccessful();
}
db.endTransaction();
Edit
Use you model class for setting data

I change these things
For Creating Table
private static void createAllTables(SQLiteDatabase database) {
//database.execSQL(" CREATE TABLE IF NOT EXISTS " + IN_RIDE_DATA + " (" + USER_ID +"," + TOTAL_DISPLACEMENT_DISTANCE + "" + ");");
database.execSQL(" CREATE TABLE IF NOT EXISTS " + IN_RIDE_DATA + " ("
+ TOTAL_DISPLACEMENT_DISTANCE + " TEXT, "
+ USER_ID + " TEXT"+");");
}
For Deleting Table
public void deleteDriverLocData() {
try {
database.delete(NewDatabaseForInRideData.IN_RIDE_DATA, null, null);
} catch (Exception e) {
e.printStackTrace();
}
}
For Inserting
public void insertDisplacement(String id, String displacement) {
try {
deleteDriverLocData();
ContentValues contentValues = new ContentValues();
contentValues.put(NewDatabaseForInRideData.USER_ID, id);
contentValues.put(NewDatabaseForInRideData.TOTAL_DISPLACEMENT_DISTANCE, displacement);
database.insert(NewDatabaseForInRideData.IN_RIDE_DATA, null, contentValues);
} catch (Exception e) {
e.printStackTrace();
}
}
For retrieving the values:
public String getDisplacement() {
try {
String[] columns = new String[]{NewDatabaseForInRideData.TOTAL_DISPLACEMENT_DISTANCE};
Cursor cursor = database.query(NewDatabaseForInRideData.IN_RIDE_DATA, columns, null, null, null, null, null);
cursor.moveToFirst();
String totaldisplacement = cursor.getString(cursor.getColumnIndex(NewDatabaseForInRideData.TOTAL_DISPLACEMENT_DISTANCE));
return totaldisplacement;
} catch (Exception e) {
e.printStackTrace();
return "";
}
}

How to prevent app crashed after delete empty database

i had been trying to prevent accidentally click on delete button when the data base is empty. It will crash after click.
Database handler
public void deleteLastMessage(Class a) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_NAME, KEY_MSG + " = ?",
new String[] { String.valueOf(a.get_message()) });
db.close();
}
public String getLastString() {
String selectQuery = "SELECT * FROM " + TABLE_NAME;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
cursor.moveToLast();
LastString = cursor.getString(0);
cursor.close();
db.close();
return LastString;
}
Activity
public void deleteMessage(View v) {
LastMessage = new SubliminalClass(db.getLastString());
db.deleteLastMessage(LastMessage);
It work fine when there are data to delete, it crashed when there is no data.
My data is a column of string.
Referred to this Application crashes while reading an empty table in android but to no avail.
I have tried this below but still crashed when there is no data.
public boolean checkdb(){
SQLiteDatabase db = this.getReadableDatabase();
Cursor mCursor = db.rawQuery("SELECT * FROM " + TABLE_NAME, null);
Boolean rowExists;
String nullString="";
if (nullString.equals(getLastString())) //todo change this
// DO SOMETHING WITH CURSOR
rowExists = false;
else
{
// I AM EMPTY
rowExists = true;
}
return rowExists;
}
Anyone can help me solve this?

Try this
Check the table row count is greater than zero then do the delete operation.
//Add in your activity
int rowCount = db.getRowCount();
db.close();
if(rowCount>0)
{
db.deleteLastMessage(LastMessage);
}else{
}
//Add in DBhelperClass
public int getRowCount() {
String countQuery = "SELECT * FROM " + TABLE_NAME;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
int cnt = cursor.getCount();
cursor.close();
return cnt;
}
public void deleteLastMessage(Class a) {
try{
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_NAME, KEY_MSG + " = ?",
new String[] { String.valueOf(a.get_message()) });
db.close();
} catch (Exception e){
e.printStackTrace();
}
}

You could add try/catch around your delete code.
Also the checkdb function could be like this
public boolean checkdb(){
SQLiteDatabase db = this.getReadableDatabase();
Log.d(TAG,"Got Readable DB")
Cursor mCursor = db.rawQuery("SELECT * FROM " + TABLE_NAME, null);
Boolean rowExists = false;
String nullString="";
if(mCursor != null){
Log.d(TAG,"Cursor is not null")
try{
rowExists = mCursor.getCount() > 0;
Log.d(TAG,"rowExists is " + rowExists);
mCursor.close();
} catch (Exception e){
e.printStackTrace();
}
}
return rowExists;
}

How to iterate and retrieve over all data stored in sqlite database

I am having problem while retrieving data from sqlite database what I need is to retrieve all data on console. But I am getting only one rows data on console
Here is the code to insert and retrieve data from Sqlite. Please specify what I am missing or doing wrong. Thanks for any help.
public long InsertContacts(Contacts contacts) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(KEY_IMAGE, DbUtility.getBytes(contacts.getBmp()));
contentValues.put(KEY_BABY_NAME, contacts.getBaby_name());
contentValues.put(KEY_GENDER, contacts.getBaby_gender());
contentValues.put(KEY_SET_DATE, contacts.getDate());
contentValues.put(KEY_SET_TIME, contacts.getTime());
return db.insert(TABLE_NAME, null, contentValues);
}
public Contacts retriveContactsDetails() {
SQLiteDatabase db = this.getReadableDatabase();
String[] columns = new String[]{KEY_IMAGE, KEY_BABY_NAME, KEY_GENDER, KEY_SET_DATE, KEY_SET_TIME};
Cursor cursor = db.query(TABLE_NAME, columns, null, null, null, null, null);
cursor.moveToFirst();
while (cursor.isAfterLast() == false) {
byte[] blob = cursor.getBlob(cursor.getColumnIndex(KEY_IMAGE));
String name = cursor.getString(cursor.getColumnIndex(KEY_BABY_NAME));
String gender = cursor.getString(cursor.getColumnIndex(KEY_GENDER));
String date = cursor.getString(cursor.getColumnIndex(KEY_SET_DATE));
String time = cursor.getString(cursor.getColumnIndex(KEY_SET_TIME));
Log.d(TAG, DbUtility.getImage(blob) + name + "-" + gender + "-" + date + "- " + time); // I need to get all date here that have been inserted but i am getting only first rows data every time i insert.
cursor.moveToNext();
return new Contacts(DbUtility.getImage(blob), name, gender, date, time);
}
cursor.close();
return null;
}
}
Contacts.java
public class Contacts {
private Bitmap bmp;
private String baby_name;
private String baby_gender;
private String date;
private String time;
public Contacts(Bitmap b, String n, String g, String d, String t) {
bmp = b;
baby_name = n;
baby_gender = g;
date = d;
time = t;
}
public Bitmap getBmp() {
return bmp;
}
public String getBaby_name() {
return baby_name;
}
public String getBaby_gender() {
return baby_gender;
}
public String getDate() {
return date;
}
public String getTime() {
return time;
}
}

You should change your retriveContactsDetails() to this:
public List<Contacts> retriveContactsDetails() {
SQLiteDatabase db = this.getReadableDatabase();
String[] columns = new String[]{KEY_IMAGE, KEY_BABY_NAME, KEY_GENDER, KEY_SET_DATE, KEY_SET_TIME};
List<Contacts> contactsList = new ArrayList<>();
Cursor cursor;
try {
cursor = db.query(TABLE_NAME, columns, null, null, null, null, null);
while(cursor.moveToNext()) {
byte[] blob = cursor.getBlob(cursor.getColumnIndex(KEY_IMAGE));
String name = cursor.getString(cursor.getColumnIndex(KEY_BABY_NAME));
String gender = cursor.getString(cursor.getColumnIndex(KEY_GENDER));
String date = cursor.getString(cursor.getColumnIndex(KEY_SET_DATE));
String time = cursor.getString(cursor.getColumnIndex(KEY_SET_TIME));
contactsList.add(new Contacts(DbUtility.getImage(blob), name, gender, date, time));
Log.d(TAG, DbUtility.getImage(blob) + name + "-" + gender + "-" + date + "- " + time);
}
} catch (Exception ex) {
// Handle exception
} finally {
if(cursor != null) cursor.close();
}
return contactsList;
}
Also, your Contacts class should be named Contact as it contains only a single instance of your object.

public Contacts retriveContactsDetails() {
...
while (cursor.isAfterLast() == false) {
...
cursor.moveToNext();
return new Contacts(...);
}
Your Contacts class is named wrong because it contains only a single contact. It should be named Contact.
The return statement does what it says, it returns from the function. So the loop body cannot be executed more than once.
What you actually want to do is to construct a list of contacts, add one contact object to the list in each loop iteration, and return that list at the end.

Get all values from a Column in SQLite and return as a list

I am trying to populate a RecyclerView with the data in each column.
I want to retrieve all of the values under a column and return it as a List dynamically.
What is the best way to go about this?
Attached is a sample image of the data:
There is a list of tables I am showing in the app, then the user should be able to click on a table name and see a RecyclerView of all of the values under each column with swipeable tabs.
For the image above, the user should see a recyclerview of CreateDate, then swipe over and see a recyclerview of CreatedByTablet, etc.
The problem I am encountering is how to return all of the values in a column, dynamically. I am not that familiar with SQL so how would I go about accomplishing this? And how would the method know to return a List<String> or a List<Integer>?
Here is some code I wrote to attempt this:
// Get all table names
public List<String> getAllTableNames() {
List<String> tableNames = new ArrayList<>();
try {
String query = "SELECT name FROM sqlite_master WHERE type='table'";
SQLiteDatabase db = SQLiteDatabase.openDatabase(DB_PATH + DB_NAME, null, SQLiteDatabase.OPEN_READWRITE);
Cursor cursor = db.rawQuery(query, null);
// Iterate
if (cursor.moveToFirst()) {
while (!cursor.isAfterLast()) {
tableNames.add(cursor.getString(cursor.getColumnIndex("name")));
cursor.moveToNext();
}
}
} catch (Exception e) {
e.printStackTrace();
}
return tableNames;
}
// Get all names of columns inside a table
public List<String> getAllColumnNames(String tableName) {
List<String> names = new ArrayList<>();
try {
String query = "SELECT * FROM " + tableName;
SQLiteDatabase db = SQLiteDatabase.openDatabase(DB_PATH + DB_NAME, null, SQLiteDatabase.OPEN_READWRITE);
Cursor cursor = db.rawQuery(query, null, null);
String[] columnNames = cursor.getColumnNames();
names = Arrays.asList(columnNames);
} catch (Exception e) {
e.printStackTrace();
}
return names;
}
public int getColumnType(String tableName, String columnName) {
String[] args = { columnName };
try {
int type;
String query = "SELECT * FROM " + tableName;
SQLiteDatabase db = SQLiteDatabase.openDatabase(DB_PATH + DB_NAME, null, SQLiteDatabase.OPEN_READWRITE);
Cursor cursor = db.rawQuery(query, args);
Log.d(TAG, "Column Index: " + String.valueOf(cursor.getColumnIndex(columnName)));
type = cursor.getType(cursor.getColumnIndex(columnName));
return type;
} catch (Exception e) {
e.printStackTrace();
}
return 0;
}
public List getAllRows(String tableName, String columnName, int type) {
Log.d(TAG, "Getting all rows");
switch (type) {
case 1:
List<Integer> integerList = createIntegerList(tableName, columnName);
return integerList;
case 3:
List<String> stringList = createStringList(tableName, columnName);
return stringList;
}
return null;
}
private List<Integer> createIntegerList(String tableName, String columnName) {
List<Integer> integerList = new ArrayList<>();
try {
String query = "SELECT * FROM " + tableName;
SQLiteDatabase db = SQLiteDatabase.openDatabase(DB_PATH + DB_NAME, null, SQLiteDatabase.OPEN_READWRITE);
Cursor cursor = db.rawQuery(query, null);
if (cursor.moveToFirst()) {
while (!cursor.isAfterLast()) {
int number = cursor.getInt(cursor.getColumnIndex(columnName));
integerList.add(number);
cursor.moveToNext();
}
}
} catch (Exception e) {
e.printStackTrace();
}
return integerList;
}
private List<String> createStringList(String tableName, String columnName) {
List<String> integerList = new ArrayList<>();
try {
String query = "SELECT * FROM " + tableName;
SQLiteDatabase db = SQLiteDatabase.openDatabase(DB_PATH + DB_NAME, null, SQLiteDatabase.OPEN_READWRITE);
Cursor cursor = db.rawQuery(query, null);
if (cursor.moveToFirst()) {
while (!cursor.isAfterLast()) {
String name = cursor.getString(cursor.getColumnIndex(columnName));
integerList.add(name);
cursor.moveToNext();
}
}
} catch (Exception e) {
e.printStackTrace();
}
return integerList;
}
How can I return a list of integer or string (depending of column data type) of all the values in a column inside a table in Sqlite android?

Application stops working on mobile device but runs on emmulator

i have developed an app for 'bank simulation' which uses sqlite to create databases...
when i run the app on my mobile it stops unexpectedly....do i need to install any server to run sqlite based apps on mobile?
Thanks in advance!
DbHelper.java
private static final String DATABASE_NAME = "saket.db";
private static final int DATABASE_VERSION = 1;
public static final String SUBH_TABLE_NAME = "login";
public static final String SUBH_TABLE_DATA = "TBL_Transaction";
public static final String KEY_ROWID = "_id";
private static final String SUBH_TABLE_CREATE =
"CREATE TABLE " + SUBH_TABLE_NAME + "(" +
"_id INTEGER PRIMARY KEY AUTOINCREMENT,"+
"username TEXT NOT NULL, password TEXT NOT NULL, email TEXT NOT NULL, balance INTEGER);";
private static final String SUBH_TABLE_DATA_CREATE =
"CREATE TABLE " + SUBH_TABLE_DATA + "(" +
"trans_id INTEGER PRIMARY KEY AUTOINCREMENT, "+
"user_id INTEGER, " +
"trans TEXT NOT NULL);";
private static final String SAKET_DB_ADMIN = "INSERT INTO "+ SUBH_TABLE_NAME +" values(1, admin, password, admin#gmail.com);";
//private static final String SAKET_DB_ADMIN_Trans = "INSERT INTO "+ SUBH_TABLE_DATA +" values(1, asdf);";
public DbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
System.out.println("In constructor");
}
/* (non-Javadoc)
* #see android.database.sqlite.SQLiteOpenHelper#onCreate(android.database.sqlite.SQLiteDatabase)
*/
#Override
public void onCreate(SQLiteDatabase db) {
try{
//Create Database
db.execSQL(SUBH_TABLE_CREATE);
//create transaction account
db.execSQL(SUBH_TABLE_DATA_CREATE);
//create admin account
db.execSQL(SAKET_DB_ADMIN);
//db.execSQL(SAKET_DB_ADMIN_Trans);
System.out.println("In onCreate");
}catch(Exception e){
e.printStackTrace();
}
}
DatabaseActivity.java
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mNewUser = (Button) findViewById(R.id.buttonNewUser);
mNewUser.setOnClickListener(this);
mLogin = (Button) findViewById(R.id.buttonLogin);
mLogin.setOnClickListener(this);
mShowAll = (Button) findViewById(R.id.buttonShowAll);
mShowAll.setOnClickListener(this);
}
public void onClick(View v) {
switch (v.getId()) {
case R.id.buttonLogin:
mUsername = (EditText) findViewById(R.id.editUsername);
mPassword = (EditText) findViewById(R.id.editPassword);
String uname = mUsername.getText().toString();
String pass = mPassword.getText().toString();
if (uname.equals("") || uname == null) {
Toast.makeText(getApplicationContext(), "Username Empty",
Toast.LENGTH_SHORT).show();
} else if (pass.equals("") || pass == null) {
Toast.makeText(getApplicationContext(), "Password Empty",
Toast.LENGTH_SHORT).show();
} else {
boolean validLogin = false;
try {
validLogin = validateLogin(uname, pass,
DatabaseActivity.this);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (validLogin) {
System.out.println("In Valid");
Intent i_login = new Intent(DatabaseActivity.this,
UserLoggedInPage.class);
try {
id = getID(uname, pass, DatabaseActivity.this);
Ubal = getBAL(uname, pass, DatabaseActivity.this);
} catch (NumberFormatException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.d(TAG, "putting the extra " + id);
i_login.putExtra("key", id);
i_login.putExtra("bkey", Ubal);
startActivity(i_login);
finish();
}
}
break;
case R.id.buttonNewUser:
Intent i = new Intent(DatabaseActivity.this, NewUserActivity.class);
startActivity(i);
finish();
break;
case R.id.buttonShowAll:
Intent i_admin = new Intent(DatabaseActivity.this, AdminPage.class);
startActivity(i_admin);
finish();
break;
}
}
public boolean validateLogin(String uname, String pass, Context context)
throws Exception {
myDb = new DbHelper(context);
SQLiteDatabase db = myDb.getReadableDatabase();
// SELECT
String[] columns = { "_id" };
// WHERE clause
String selection = "username=? AND password=?";
// WHERE clause arguments
String[] selectionArgs = { uname, pass };
Cursor cursor = null;
try {
// SELECT _id FROM login WHERE username = uname AND password=pass
cursor = db.query(DbHelper.SUBH_TABLE_NAME, columns, selection,
selectionArgs, null, null, null);
startManagingCursor(cursor);
} catch (Exception e) {
e.printStackTrace();
}
int numberOfRows = cursor.getCount();
if (numberOfRows <= 0) {
Toast.makeText(getApplicationContext(),
"Login Failed..\nTry Again", Toast.LENGTH_SHORT).show();
return false;
}
return true;
}
// get rowid
// public int getID(String uname, String pass, Context context)
// throws Exception {
//
// myDb = new DbHelper(context);
// SQLiteDatabase db = myDb.getReadableDatabase();
// cursor = db.rawQuery("select * from " + DbHelper.SUBH_TABLE_NAME +
// " where username = " + uname + "&" + "password = " + pass + ";)", null);
// if (cursor != null) {
// if(cursor.moveToFirst()){
// int id = cursor.getInt(cursor.getColumnIndex(DbHelper.KEY_ROWID));
// }
//
// }
//
// return id;
//
// }
public String getID(String uname, String pass, Context context) {
try {
String idddd = null;
SQLiteDatabase db = myDb.getReadableDatabase();
String[] columns = { "_id" };
// WHERE clause
String selection = "username=? AND password=?";
// WHERE clause arguments
String[] selectionArgs = { uname, pass };
Cursor cursor = db.query(DbHelper.SUBH_TABLE_NAME, columns,
selection, selectionArgs, null, null, null);
if (cursor != null) {
startManagingCursor(cursor);
while (cursor.moveToNext()) {
idddd = cursor.getString(0);
}
return idddd;
}
System.out.println("Cursor NuLL");
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
private String getBAL(String uname, String pass,
DatabaseActivity databaseActivity) {
try {
String ballll = null;
SQLiteDatabase db = myDb.getReadableDatabase();
String[] columns = { "balance" };
// WHERE clause
String selection = "username=? AND password=?";
// WHERE clause arguments
String[] selectionArgs = { uname, pass };
Cursor cursor = db.query(DbHelper.SUBH_TABLE_NAME, columns,
selection, selectionArgs, null, null, null);
if (cursor != null) {
startManagingCursor(cursor);
while (cursor.moveToNext()) {
ballll = cursor.getString(0);
}
return ballll;
}
System.out.println("Cursor NuLL");
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
protected void onDestroy() {
super.onDestroy();
if (myDb != null && cursor != null ) {
cursor.close();
myDb.close();
}
}
}