mobile programing,android studio,java Working with SQLite database you need to implement database access using openHelper, complete the following code:private DatabaseAccess(X}public static DatabaseAccess getinstance(Context context{Il complete missing codepublic void open(XIl complete missing codepublic void close(Xif(this.database == null){this.database.close():}public boolean delete(){/l complete missing code

//CalculatorActivity.java package rajesh.com.mycalculator; import android.content.Intent; import…

Answered: mobile programing,android studio,java

Engineering

Computer Science

mobile programing,android studio,java

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter3: Data Representation

Section: Chapter Questions

Problem 3RP

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help me java web (Can you guide the solution?) 1)file db DbContext public class DBContext { protected Connection connection; public DBContext() { try { String user = "sa"; String pass = "123456789"; String url = "jdbc:sqlserver://MSI:1433;databaseName=MyOrder"; Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver"); connection = DriverManager.getConnection(url, user, pass); } catch (ClassNotFoundException | SQLException ex) { Logger.getLogger(DBContext.class.getName()).log(Level.SEVERE, null, ex); } } } 2)public class DBContext1 { public Connection getConnection()throws Exception { String url = "jdbc:sqlserver://"+serverName+":"+portNumber +";databaseName="+dbName; Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver"); return DriverManager.getConnection(url, userID, password); } private final String serverName =…
import java.sql.*; import java.util.Properties; public class PreparedStatementExample { public static void main(java.lang.String[] args) { // Load the following from a properties object. String DRIVER = "com.ibm.db2.jdbc.app.DB2Driver"; String URL = "jdbc:db2://*local"; // Register the native JDBC driver. If the driver cannot // be registered, the test cannot continue. try { Class.forName(DRIVER); } catch (Exception e) { System.out.println("Driver failed to register."); System.out.println(e.getMessage()); System.exit(1); } Connection c = null; Statement s = null; // This program creates a table that is // used by prepared statements later. try { // Create the connection properties. Properties properties = new Properties (); properties.put ("user", "userid"); properties.put ("password", "password"); // Connect to the local database. c = DriverManager.getConnection(URL, properties); // Create a Statement object. s = c.createStatement(); // Delete the test table if it exists. Note that //…
use c++ language You run an e-comměrce website and want to record the last N order ids in a log. Implement a data structure to accomplish this, with the following API: record(order_id): adds the order_id to the log get_last(i): gets the ith last element from the log. i is guaranteed to be smaller than or equal to N. You should be as efficient with time and space as possible.
Android question: Suppose you have a table named ‘food’ with the following attributes: Id: int (primary key) name: varchar(20) calories: int cost: float Write a piece of code representing a method in a Dao interface that is part of a Room database implementation. If the method is invoked, all food with ‘calories’ of more than 90 and costs less than 270 must be deleted. Note: suggest a name for your method.
1. Develop a data manipulation application with a user-friendly JavaFX GUI for student's database (as shown in the ER diagram below). The user should be able to edit existing data and add new data to the database (obeying referential and entity integrity constraints). Allow the user to edit the database in the following ways: a) Add a new student. b) Edit the existing information for a student. c) Delete an existing student. d) Add a new course registration for a student. Student Registration Course id 1 studentid id name courseid major grade name semester room 2. Upgrade the application in Ql to provide an appropriate JavaFX to allow the user to perfom a query that is defined in a TextArea and the results will be shown in a Tableview. Sample predefined queries are: a) Select all students studying "Software Engineering" major. b) Select students who have excellent grades. c) Select all pass students in ascending order based on their names. d) For all students studying "Computer…
Write a #save instance method to create or update a given post in the DB: class Post def initialize(attributes = {}) @id = attributes[:id] @url = attributes[:url] @votes = attributes[:votes] || 0 @title = attributes[:title] end def save # TODO: write this method using SQLite3::Database instance DB end end
Which example uses the SOLID SRP principle correctly and does not violate it? (A or B) A. public class DatabaseParser { ParseDirectoryMapFile(); // parse directory map fileParsePasswordFile(); // parse user fileParseReviewDataFile(); // parse review data fileParseTeamFile(); // parse team CalculateGrade(); CalulateRelativeGrade(); } B public class DatabaseParser { ParseDirectoryMapFile(); // parse directory map fileParsePasswordFile(); // parse user fileParseReviewDataFile(); // parse review data fileParseTeamFile(); // parse team file} // seperately with the following: public class Calculator{ CalculateGrade(); CalulateRelativeGrade(); }
In java create an application to manage your data base information the database is already created in mysql tables, the tables are fill, So the user can use your database application user friendly Retrieve all data: Given a table name, retrieve all data from the table and present it to the user. Average: Given a table name and a column name, return the average of the column. Here the assumption is that the column type will be numeric (e.g., cost column). Insert: Given a table name, your program should show the column names of that table and ask the users to input new data to the table. In case of errors, your program should directly show the MySQL errors to the users. Assumption 1: Users will enter data according to the database constraints. Assumption 2: Users will input one record at a time. Delete: Given a table name, your program should show the column names of that table and ask the users to input data that they want to delete. Assumption 1: Users will enter data according to the…
{ String str = tf5.getInt("ID"); Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver"); Connection con = DriverManager.getConnection("jdbc:sqlserver://NOMBUSO1806:1433;databaseName= Employee ATM", "NOMBUSO1806", "mysql1234"); // write your database username and password PreparedStatement st = con.prepareStatement("select * from Employees where ID=?"); // Search with ATM ID st.setString(1, str); ResultSet rs = st.executeQuery(); // Excuting Query if (rs.next()) { String s = rs.getString(1); String s1 = rs.getString(2); String s2 = rs.getString(3); // Sets Records in TextFields. tf1.setText(s); tf2.setText(s1); tf3.setText(s2); my getInt() is throwing an error that the method is not found. what should i do?
#Fill in comments to spec. import sqlite3from contextlib import closing from Objects import Player, Lineup conn = None def connect():global connif not conn:DB_FILE = "player_db.sqlite"conn = sqlite3.connect(DB_FILE)conn.row_factory = sqlite3.Row def close():if conn:conn.close() def get_players():return None #remove this line when code is added.# SQL statement to select all 7 fields for all players # Use a with statement to execute the query # Create a lineup object# use a loop to populate the lineup object with player objects# return the lineup object def get_player(playerID):return None #remove this line when code is added.# SQL statement to select all 7 fields for a player # Use a with statement to execute the query & return a player object if the player exists def add_player(player):return None #remove this line when code is added.# SQL statement to insert 6 fields for a player added to the table # Use a with statement to execute the query def delete_player(player):return None…
on 12 When database version in SQLite database is decreased then helper class will call et red O a. onCreate() d out of O b. onDowngrade() g question O c. onUpgrade() O d. onClose()
what is the output? public class testone {public static void main(String[]args) {Database mydata = new Database();mydata.addRecord(8);mydata.addRecord(3);mydata.addRecord(10);System.out.println(mydata);}}class Database{private final Object Record;private Recordpublic Database () {Record = new Record(0);}public void addRecord (int a){Record rec = new Record(rec.getValue() + a);} public String toString(){String rec = null;return ""+rec;}}class Record{private int Value;public Record (int val){Value = val;}public int getValue(){return Value;public String toString(){return "" + Value; }}