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Ich finde ähnliche Fragen, die alle fehlende Kommas, Whitespaces usw. betreffen. Allerdings finde ich nichts dergleichen in meinem Code, so dass diese Antworten mir hier nicht helfen, es sei denn, ich ' Ich habe etwas in meiner Syntax völlig vermisst.SQLiteException keine solche Spalte user_email
Ich versuche, herauszufinden, warum ich die Störung erhalten
SQLiteException no such column: user_email (code 1):, while compiling:
SELECT user_id FROM user WHERE user_email=?
, wenn ich meinen Register-Button klicken. Hier ist onClick und postDataToSQLite Methoden aus meiner Register Aktivitätsklasse:
/**
* This implemented method is to listen the click on view
*
* @param v
*/
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.appCompatButtonRegister:
postDataToSQLite();
break;
case R.id.appCompatTextViewLoginLink:
finish();
break;
}
}
/**
* This method is to validate the input text fields and post data to SQLite
*/
private void postDataToSQLite() {
if (!inputValidation.isInputEditTextFilled(textInputEditTextName, textInputLayoutName, getString(R.string.error_message_name))) {
return;
}
if (!inputValidation.isInputEditTextFilled(textInputEditTextEmail, textInputLayoutEmail, getString(R.string.error_message_email))) {
return;
}
if (!inputValidation.isInputEditTextEmail(textInputEditTextEmail, textInputLayoutEmail, getString(R.string.error_message_email))) {
return;
}
if (!inputValidation.isInputEditTextFilled(textInputEditTextPassword, textInputLayoutPassword, getString(R.string.error_message_password))) {
return;
}
if (!inputValidation.isInputEditTextMatches(textInputEditTextPassword, textInputEditTextConfirmPassword,
textInputLayoutConfirmPassword, getString(R.string.error_password_match))) {
return;
}
if (!databaseHelper.checkUser(textInputEditTextEmail.getText().toString().trim())) {
user.setName(textInputEditTextName.getText().toString().trim());
user.setEmail(textInputEditTextEmail.getText().toString().trim());
user.setPassword(textInputEditTextPassword.getText().toString().trim());
databaseHelper.addUser(user);
// Snack Bar to show success message that record saved successfully
Snackbar.make(nestedScrollView, getString(R.string.success_message), Snackbar.LENGTH_LONG).show();
emptyInputEditText();
} else {
// Snack Bar to show error message that record already exists
Snackbar.make(nestedScrollView, getString(R.string.error_email_exists), Snackbar.LENGTH_LONG).show();
}
}
Hier ist meine DatabaseHelper Klasse:
package sql;
import android.content.ContentValues;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import java.util.ArrayList;
import java.util.List;
import android.database.Cursor;
import modal.User;
/**
* Created by christopher on 9/21/17.
*/
public class DatabaseHelper extends SQLiteOpenHelper {
//Database Version
private static final int DATABASE_VERSION = 1;
//Database Name
private static final String DATABASE_NAME = "WillowHQ.db";
//User table name
private static final String TABLE_USER = "user";
//User Table Column names
private static final String COLUMN_USER_ID = "user_id";
private static final String COLUMN_USER_NAME = "user_name";
private static final String COLUMN_USER_EMAIL = "user_email";
private static final String COLUMN_USER_PASSWORD = "user_password";
//create table sql query
private String CREATE_USER_TABLE = "CREATE TABLE " + TABLE_USER + "(" + COLUMN_USER_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + COLUMN_USER_NAME + " TEXT, " + COLUMN_USER_EMAIL + " TEXT, " + COLUMN_USER_PASSWORD + " TEXT" + ")";
//drop table sql query
private String DROP_USER_TABLE = "DROP TABLE IF EXISTS " + TABLE_USER;
/**
* Constructor
*
* @param context
*/
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_USER_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
//Drop User Table if exists
db.execSQL(DROP_USER_TABLE);
//create tables again
onCreate(db);
}
/**
* Create user record
*
* @param user
*/
public void addUser(User user) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(COLUMN_USER_NAME, user.getName());
values.put(COLUMN_USER_EMAIL, user.getEmail());
values.put(COLUMN_USER_PASSWORD, user.getPassword());
//Inserting Row
db.insert(TABLE_USER, null, values);
db.close();
}
/**
* Fetch all users and return the list of user records
*
* @return list
*/
public List<User> getAllUser() {
//array of columns to fetch
String[] columns = {
COLUMN_USER_ID,
COLUMN_USER_EMAIL,
COLUMN_USER_NAME,
COLUMN_USER_PASSWORD
};
//sorting orders
String sortOrder =
COLUMN_USER_NAME + " ASC";
List<User> userList = new ArrayList<User>();
SQLiteDatabase db = this.getReadableDatabase();
//query the user table
/**
* Here query function is used to fetch records from user table this function works like we use sql query.
* SQL query equivalent to this query function is
* SELECT user_id,user_name,user_email,user_password FROM user ORDER BY user_name;
*/
Cursor cursor = db.query(TABLE_USER, columns, null, null, null, null, sortOrder);
//Traversing through all rows and adding to the list
if(cursor.moveToFirst()) {
do {
User user = new User();
user.setId(Integer.parseInt(cursor.getString(cursor.getColumnIndex(COLUMN_USER_ID))));
user.setName(cursor.getString(cursor.getColumnIndex(COLUMN_USER_NAME)));
user.setEmail(cursor.getString(cursor.getColumnIndex(COLUMN_USER_EMAIL)));
user.setPassword(cursor.getString(cursor.getColumnIndex(COLUMN_USER_PASSWORD)));
// Adding user record to list
userList.add(user);
} while (cursor.moveToNext());
}
cursor.close();
db.close();
// return user list
return userList;
}
/**
* This method to update user record
*
* @param user
*/
public void updateUser(User user) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(COLUMN_USER_NAME, user.getName());
values.put(COLUMN_USER_EMAIL, user.getEmail());
values.put(COLUMN_USER_PASSWORD, user.getPassword());
// updating row
db.update(TABLE_USER, values, COLUMN_USER_ID + " = ?",
new String[]{String.valueOf(user.getId())});
db.close();
}
/**
* This method is to delete user record
*
* @param user
*/
public void deleteUser(User user) {
SQLiteDatabase db = this.getWritableDatabase();
// delete user record by id
db.delete(TABLE_USER, COLUMN_USER_ID + " = ?",
new String[]{String.valueOf(user.getId())});
db.close();
}
/**
* This method to check user exist or not
*
* @param email
* @return true/false
*/
public boolean checkUser(String email) {
// array of columns to fetch
String[] columns = {
COLUMN_USER_ID
};
SQLiteDatabase db = this.getReadableDatabase();
// selection criteria
String selection = COLUMN_USER_EMAIL + " = ?";
// selection argument
String[] selectionArgs = {email};
// query user table with condition
/**
* function is used to fetch records from user table
* SQL query equivalent to this query function is
* SELECT user_id FROM user WHERE user_email = '[email protected]';
*/
Cursor cursor = db.query(TABLE_USER, //Table to query
columns, //columns to return
selection, //columns for the WHERE clause
selectionArgs, //The values for the WHERE clause
null, //group the rows
null, //filter by row groups
null); //The sort order
int cursorCount = cursor.getCount();
cursor.close();
db.close();
if (cursorCount > 0) {
return true;
}
return false;
}
/**
* This method to check user exist or not
*
* @param email
* @param password
* @return true/false
*/
public boolean checkUser(String email, String password) {
// array of columns to fetch
String[] columns = {
COLUMN_USER_ID
};
SQLiteDatabase db = this.getReadableDatabase();
// selection criteria
String selection = COLUMN_USER_EMAIL + " = ?" + " AND " + COLUMN_USER_PASSWORD + " = ?";
// selection arguments
String[] selectionArgs = {email, password};
// query user table with conditions
/**
* Here query function is used to fetch records from user table this function works like we use sql query.
* SQL query equivalent to this query function is
* SELECT user_id FROM user WHERE user_email = '[email protected]' AND user_password = 'whatever';
*/
Cursor cursor = db.query(TABLE_USER, columns, selection, selectionArgs, null, null, null);
int cursorCount = cursor.getCount();
cursor.close();
db.close();
if (cursorCount > 0) {
return true;
}
return false;
}
}
Ist es möglich, dass diese Tabelle erstellt wurde, bevor die Spalte user_email an die Abfrage create table angefügt wurde? –