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How to check that a string being entered isn't a unique string. Java (SQLite database)

Hi I am new to android development and I am attempting to make an app which stores appointments. My fragments and activities are all fine however I am trying to work out how to check my sqlite database that the string I am trying to enter isn't already stored as a unique string already, any help is much appreciated.
Here is my code for the database so far.
public class MyDataBase extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 4;
private static final String DATABASE_NAME = "appointments.db";
public static final String TABLE_APPOINTMENTS = "appointments";
public static final String COLUMN_DAY = "day";
public static final String COLUMN_MONTH = "month";
public static final String COLUMN_YEAR = "year";
public static final String COLUMN_TITLE = "title";
public static final String COLUMN_TIME = "time";
public static final String COLUMN_DESCRIPTION = "details";
public MyDataBase(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
#Override
public void onCreate(SQLiteDatabase db) {
String query = "CREATE TABLE " + TABLE_APPOINTMENTS
+ "(" + COLUMN_DAY + " INTEGER, " + COLUMN_MONTH + " INTEGER, " + COLUMN_YEAR + " INTEGER, "
+ COLUMN_TITLE + " TEXT NOT NULL UNIQUE, " + COLUMN_TIME + " TEXT, " + COLUMN_DESCRIPTION + " TEXT" + ")";
db.execSQL(query);
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_APPOINTMENTS);
onCreate(db);
}
public void addAppointment(Appointment app){
SQLiteDatabase db = getWritableDatabase();
ContentValues values = new ContentValues();
values.put(COLUMN_DAY, app.get_day());
values.put(COLUMN_MONTH, app.get_month());
values.put(COLUMN_YEAR, app.get_year());
values.put(COLUMN_TITLE, app.get_title()); // need to check that string being entered isn't already a unique entry
values.put(COLUMN_TIME, app.get_time());
values.put(COLUMN_DESCRIPTION, app.get_details());
db.insert(TABLE_APPOINTMENTS, null, values);
db.close();
}
}

Call this method and check return true mean its exist otherwise not.
public boolean checkAppointmentExist(String name){
booolean isExist = false;
String selection = COLUMN_TITLE + " = ? ";
String[] selectionArgs = new String[]{name};
Cursor cursor = database.query(TABLE_APPOINTMENTS, null, selection, selectionArgs, null, null, null);
if (cursor != null) {
if (cursor.getCount() > 0) {
isExist = true;
}
}
return isExist;
}
public void addAppointment(Appointment app){
if(!checkAppointmentExist(app.get_title())){
SQLiteDatabase db = getWritableDatabase();
ContentValues values = new ContentValues();
values.put(COLUMN_DAY, app.get_day());
values.put(COLUMN_MONTH, app.get_month());
values.put(COLUMN_YEAR, app.get_year());
values.put(COLUMN_TITLE, app.get_title()); // need to check that string being entered isn't already a unique entry
values.put(COLUMN_TIME, app.get_time());
values.put(COLUMN_DESCRIPTION, app.get_details());
db.insert(TABLE_APPOINTMENTS, null, values);
db.close();
}
}

can not Creating tables in sqlite database on android

I can not create a table. It shows that the database is created and I can also insert a row, but the table is not created.
public class DatabaseOperations extends SQLiteOpenHelper {
public static final int Database_version = 2;
public static final String Tag = DatabaseOperations.class.getSimpleName();
private static final String SQL_CREATE_ENTRIES =
"CREATE TABLE " + TableData.TableInfo.TABLE_NAME + " (" +
TableData.TableInfo.USER_ID + " INTEGER PRIMARY KEY," +
TableData.TableInfo.USER_PASS +" TEXT "+ "," +
TableData.TableInfo.USER_EMAIL +" TEXT "+ ");";
public DatabaseOperations(Context context) {
super(context, TableData.TableInfo.DATABASE_NAME, null,Database_version);
Log.d("Tag", "Database created");
}
#Override
public void onCreate(SQLiteDatabase sdb) {
sdb.execSQL(SQL_CREATE_ENTRIES);
Log.d("Tag", "Table created");
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
public void putInformation(DatabaseOperations drop, String name, String pass, String email) {
SQLiteDatabase SQ = drop.getWritableDatabase();
ContentValues cv = new ContentValues();
cv.put(TableData.TableInfo.USER_ID, name);
cv.put(TableData.TableInfo.USER_PASS, pass);
cv.put(TableData.TableInfo.USER_EMAIL, email);
long k = SQ.insert(TableData.TableInfo.TABLE_NAME, null, cv);
Log.d("Tag", "inert a row");
}
public Cursor getInformation(DatabaseOperations dop) {
SQLiteDatabase SQ = dop.getReadableDatabase();
String[] coloumns = {TableData.TableInfo.USER_ID, TableData.TableInfo.USER_PASS, TableData.TableInfo.USER_EMAIL};
Cursor CR = SQ.query(TableData.TableInfo.TABLE_NAME, coloumns, null, null, null, null, null);
return CR;
}
}

You're missing a , between USER_EMAIL and USER_PASS columns in the CREATE TABLE.
After adding it you can uninstall your app to recreate the database. When is SQLiteOpenHelper onCreate() / onUpgrade() run?

You miss comma in USER PASS type.Uninstall the application and install it again each time you add something new to sqlite database because the table structure has been changed.So you need to reinstall the new application .
The code should be like this
private static final String SQL_CREATE_ENTRIES =
"CREATE TABLE " + TableData.TableInfo.TABLE_NAME + " (" +
TableData.TableInfo.USER_ID + " INTEGER PRIMARY KEY," +
TableData.TableInfo.USER_PASS +" TEXT ,"+ "," +
TableData.TableInfo.USER_EMAIL +" TEXT "+ ")";

android.database.sqlite.SQLiteException near ")"

Can anyone see what is wrong with this code please, this is the error given:
Caused by: android.database.sqlite.SQLiteException: near ")": syntax error (code 1): , while compiling: CREATE TABLE scores(_id INTEGER PRIMARY KEY AUTOINCREMENT , scoreName TEXT , );
public class MyDBHandler extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "scores.db";
public static final String TABLE_SCORES = "scores";
public static final String COLUMN_ID = "_id";
public static final String COLUMN_SCORENAME = "scoreName";
public MyDBHandler(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
super(context, DATABASE_NAME, factory, DATABASE_VERSION);
}
#Override
public void onCreate(SQLiteDatabase db) {
String query = "CREATE TABLE " + TABLE_SCORES + "(" +
COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT " +
COLUMN_SCORENAME + " TEXT " +
");";
db.execSQL(query);
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS" + TABLE_SCORES);
onCreate(db);
}
public void addScore(Scores score) {
ContentValues values = new ContentValues();
values.put(COLUMN_SCORENAME, score.get_scoreName());
SQLiteDatabase db = getWritableDatabase();
db.insert(TABLE_SCORES, null, values);
db.close();
}
public void deleteScore(String scoreName) {
SQLiteDatabase db = getWritableDatabase();
db.execSQL("DELETE FROM " + TABLE_SCORES + "WHERE " + COLUMN_SCORENAME + "=\"" + scoreName + "\";");
}
public String databaseToString() {
String dbString = "";
SQLiteDatabase db = getWritableDatabase();
String query = "SELECT * FROM " + TABLE_SCORES + "WHERE 1";
//Cursor point to a location in your results
Cursor c = db.rawQuery(query, null);
//move to first row in your results
c.moveToFirst();
while (!c.isAfterLast()) {
if (c.getString(c.getColumnIndex("scoreName")) != null) {
dbString += c.getString(c.getColumnIndex("scoreName"));
dbString += "\n";
}
}
db.close();
return dbString;
}
}

Seems problem in Query for creating table (comma is missing after AUTOINCREMENT). Try this
db.execSQL("CREATE TABLE " + TABLE_SCORES + " ("
+ COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
+ COLUMN_SCORENAME + " TEXT" + ");");

Select query where day of week?

I have events table contains start time, end time,dayOfWeek ,location etc. I want to retrieve records based on dayOfweek. I am saving dayOfWeek as string.("Mon","Tue",etc..).
How can I retrieve record for each day?
This is my EventTableHelper.
public class EventTableHelper extends SQLiteOpenHelper {
private static final String TABLE = "event";
private static final String KEY_ID = "id";
private static final String KEY_TITLE = "title";
private static final String KEY_FROM_DATE = "datefrom";
private static final String KEY_TO_DATE = "dateto";
private static final String KEY_DAY_OF_WEEK = "dayofweek";
private static final String KEY_LOCATION = "location";
private static final String KEY_NOTIFICATION_TIME = "notification";
public EventTableHelper(Context context) {
super(context, Constants.DATABASE_NAME, null, Constants.DATABASE_VERSION);
}
#Override
public void onCreate(SQLiteDatabase db) {
}
public void createTable(SQLiteDatabase db){
String CREATE_EVENTS_TABLE = "CREATE TABLE " + TABLE+ "("
+ KEY_ID + " INTEGER PRIMARY KEY,"
+ KEY_TITLE + " TEXT,"
+ KEY_FROM_DATE + " DATE,"
+ KEY_TO_DATE + " DATE,"
+ KEY_DAY_OF_WEEK + " TEXT,"
+ KEY_LOCATION + " TEXT,"
+ KEY_NOTIFICATION_TIME + "TEXT" + ")";
db.execSQL(CREATE_EVENTS_TABLE);
}
// Upgrading database
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE);
// createTable(db);
// onCreate(db);
}
public void addEvent(EventData event) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_TITLE,event.getTitle());
values.put(KEY_FROM_DATE, event.getFromDate());
values.put(KEY_TO_DATE,event.getToDate());
values.put(KEY_DAY_OF_WEEK,event.getDayOfWeek());
values.put(KEY_LOCATION,event.getLocation());
values.put(KEY_NOTIFICATION_TIME,event.getNotificationTime());
db.insert(TABLE, null, values);
db.close();
}
EventData getEvent(int id) {
SQLiteDatabase db = this.getReadableDatabase();
EventData eventData = new EventData();
Cursor cursor = db.query(TABLE, new String[]{KEY_ID,
KEY_TITLE, KEY_FROM_DATE, KEY_TO_DATE, KEY_DAY_OF_WEEK, KEY_LOCATION}, KEY_ID + "=?",
new String[]{String.valueOf(id)}, null, null, null, null);
if( cursor != null && cursor.moveToFirst() ) {
eventData = new EventData(Integer.parseInt(cursor.getString(0)), cursor.getString(1), cursor.getString(2),
cursor.getString(3), cursor.getString(4), cursor.getString(5),cursor.getString(6));
}
return eventData;
}
public List<EventData> getAllEvents() {
List<EventData> conList = new ArrayList<EventData>();
String selectQuery = "SELECT * FROM " + TABLE ;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
if (cursor.moveToFirst()) {
do {
EventData event = new EventData();
event.setId(Integer.parseInt(cursor.getString(0)));
event.setTitle(cursor.getString(1));
event.setFromDate(cursor.getString(2));
event.setToDate(cursor.getString(3));
event.setDayOfWeek(cursor.getString(4));
event.setLocation(cursor.getString(5));
event.setNotificationTime(cursor.getString(6));
conList.add(event);
} while (cursor.moveToNext());
}
return conList;
}
public int updateEvent(EventData event) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_TITLE,event.getTitle());
values.put(KEY_FROM_DATE,event.getFromDate());
values.put(KEY_TO_DATE,event.getToDate());
values.put(KEY_DAY_OF_WEEK,event.getDayOfWeek());
values.put(KEY_LOCATION,event.getLocation());
values.put(KEY_NOTIFICATION_TIME,event.getNotificationTime());
// updating row
return db.update(TABLE, values, KEY_ID + " = ?",
new String[] { String.valueOf(event.getId()) });
}
public void deleteEvent(EventData eventData) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE, KEY_ID + " = ?",
new String[]{String.valueOf(eventData.getId())});
db.close();
}
}
I tried to retrieve like this:
public List<EventData> getAllEvents(String day) {
List<EventData> conList = new ArrayList<EventData>();
String selectQuery = "SELECT * FROM " + TABLE + " WHERE (" + KEY_DAY_OF_WEEK + " = " + day;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
if (cursor.moveToFirst()) {
do {
EventData event = new EventData();
event.setId(Integer.parseInt(cursor.getString(0)));
event.setTitle(cursor.getString(1));
event.setFromDate(cursor.getString(2));
event.setToDate(cursor.getString(3));
event.setDayOfWeek(cursor.getString(4));
event.setLocation(cursor.getString(5));
event.setNotificationTime(cursor.getString(6));
conList.add(event);
} while (cursor.moveToNext());
}
return conList;
}
But it's giving Syntax error :
android.database.sqlite.SQLiteException: near "Mon": syntax error (code 1): , while compiling: SELECT * FROM event WHERE (dayofweek = Mon)
I am retrieving events like this:
String day = "Mon"
mDb = new EventTableHelper(getActivity());
events = mDb.getAllEvents(day);
I am saving dayOfWeek in another activity. I want to retrieve records in fragment. I don't have idea how to pass day parameter in function.

Do like Pass value in single quote
String selectQuery = "SELECT * FROM " + TABLE + " WHERE " + KEY_DAY_OF_WEEK +" = '"+day+ "'";

Replace this
String selectQuery = "SELECT * FROM " + TABLE + " WHERE (" + KEY_DAY_OF_WEEK + " = " + day;
To
String selectQuery = "SELECT * FROM " + TABLE + " WHERE " + KEY_DAY_OF_WEEK + " = '" + day + "'";

SQL database Columns error, or does not exist?

I am working on my sqldatabase, but i cannot move on because my program is giving me an error that there is no such column, even though the column is clearly defined at the top of my code under "KEY_NAME" If anybody can help me or needs me to post anymore code please tell me Thanks!
I've only posted my database.
******* recent logcat information
03-14 01:24:54.285: E/Database(26073): android.database.sqlite.SQLiteException: table PeopleTable has no column named persons_name: , while compiling: INSERT INTO PeopleTable(persons_hotness, persons_name) VALUES(?, ?);
public class HotOrNot {
public static final String KEY_ROWID = "_id";
public static final String KEY_NAME = "persons_name";
public static final String KEY_HOTNESS = "persons_hotness";
private static final String DATABASE_NAME = "HotOrNotDB";
private static final String DATABASE_TABLE = "PeopleTable";
private static final int DATABASE_VERSION = 1;
private DbHelper ourHelper;
private final Context ourContext;
private SQLiteDatabase ourDatabase;
private static class DbHelper extends SQLiteOpenHelper {
public DbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
#Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" + KEY_ROWID
+ " INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_NAME
+ " TEXT NOT NULL, " + KEY_HOTNESS + " TEXT NOT NULL);");
// String sql = String.format("create table %s "
// + "(%s int primary key, %s int, %s text, %s text)",
// DATABASE_TABLE, KEY_ROWID, KEY_NAME, KEY_HOTNESS);
// db.execSQL(sql);
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);
onCreate(db);
}
}
public HotOrNot(Context c) {
ourContext = c;
}
public HotOrNot open() throws SQLException {
ourHelper = new DbHelper(ourContext);
ourDatabase = ourHelper.getWritableDatabase();
return this;
}
public void close() {
ourHelper.close();
}
public long createEntry(String name, String hotness) {
// TODO Auto-generated method stub
ContentValues cv = new ContentValues();
cv.put(KEY_NAME, name);
cv.put(KEY_HOTNESS, hotness);
return ourDatabase.insert(DATABASE_TABLE, null, cv);
}
public String getData() {
// TODO Auto-generated method stub
String[] columns = new String[] { KEY_ROWID, KEY_NAME, KEY_HOTNESS };
Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null,
null, null);
String result = "";
int iRow = c.getColumnIndex(KEY_ROWID);
int iName = c.getColumnIndex(KEY_NAME);
int iHotness = c.getColumnIndex(KEY_HOTNESS);
for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) {
result = result + c.getString(iRow) + " " + c.getString(iName)
+ " " + c.getString(iHotness) + "\n";
}
return result;
}
}

db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" + KEY_ROWID
+ " INTEGER PRIMARY KEY AUTOINCREMENT,KEY_NAME TEXT NOT NULL, " + KEY_HOTNESS + " TEXT NOT NULL);");
Try the above changes..I think the problem might be due to space added before KEY_NAME. Hope this helps u..

try replacing + "KEY_NAME" + with + KEY_NAME + (without double quotes). This line is inside public void onCreate(SQLiteDatabase db)

replace your db.execSQL query by this
db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" + KEY_ROWID
+ " INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_NAME
+ " TEXT NOT NULL, " + KEY_HOTNESS + " TEXT NOT NULL);");