282 lines
12 KiB
C#
282 lines
12 KiB
C#
using System;
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using System.Collections.ObjectModel;
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using System.Data.SQLite;
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using PcgsInvUi.Models;
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namespace PcgsInvUi.Services;
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public class CoinDatabase {
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public SQLiteConnection Connection { get; set; }
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private Boolean IsConnected { get; set; }
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public ObservableCollection<Coin> Collection { get; set; }
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private PcgsClient _pcgsClient;
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public CoinDatabase() {
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// Create a connection to SQLite
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Connection = CreateConnection();
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// Create a client to access the API.
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_pcgsClient = new PcgsClient(
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"eAb8gS0I2XAvT_5gJeiGJaglMia1Tk-oB4kJUK6kuafyrny_S61vIJY-Ikl4nCQM67wrdxzUqLVWTV2kBSxD3d5XNBHxHnYBhcSS6dOPug0hZaF3qAv56df3gYSzOGh9Tif5y0eP3Iw0LrqKDr1Hj-dk6SV6GKog2IIqCPQhhHH8FMTWBTYO-_O8cx7qLdM5GM8KlTsic6g3VRUhM8EA_4OO04dCfmNLGhqINRl3jGZ0Q4ziI8fng2bVWsIyteqiPzUn10rIQ3-OPpqVZG_DxeOmOejj4GzbUNyqUOajy-nr5rYY");
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// Create a base table.
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CreateCollection("CollectionTable");
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Console.WriteLine("Connected to database.");
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Collection = new ObservableCollection<Coin>();
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GetCollection("CollectionTable");
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Console.WriteLine("Got collection.");
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}
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~CoinDatabase() {
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Console.WriteLine("Destructor called, saving collection.");
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// Save collection.
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UpdateCollection("CollectionTable");
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// Close the connection.
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Connection.Close();
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}
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private SQLiteConnection CreateConnection() {
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// Create a connection.
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SQLiteConnection connection =
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new SQLiteConnection("DataSource=C:\\Users\\lvas4\\coin_collection");
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// Open the connection.
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try {
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connection.Open();
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IsConnected = true;
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}
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catch (Exception e) {
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Console.WriteLine(e.Message);
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}
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return connection;
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}
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public void CreateCollection(string collectionName) {
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// Create a table to store the collection.
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if (!IsConnected) {
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// TODO Create a NotConnectedToDatabaseException
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Console.WriteLine("Not connected to database.");
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return;
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}
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// Create a SQL command.
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SQLiteCommand cmd = Connection.CreateCommand();
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cmd.CommandText =
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$"CREATE TABLE IF NOT EXISTS {collectionName} (" +
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"PCGS_NUMBER TEXT," +
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"GRADE TEXT" +
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"NAME TEXT," +
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"YEAR INTEGER," +
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"DENOMINATION TEXT," +
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"MINT_MARK TEXT," +
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"PRICE_GUIDE_VALUE REAL," +
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"COIN_FACTS_LINK TEXT," +
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"MAJOR_VARIETY TEXT," +
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"MINOR_VARIETY TEXT," +
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"DIE_VARIETY TEXT," +
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"SERIES_NAME TEXT," +
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"CATEGORY TEXT," +
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"DESIGNATION TEXT," +
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"CERT_NUM INTEGER," +
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"QUANTITY INTEGER," +
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"NOTES TEXT," +
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"PRIMARY KEY(PCGS_NUMBER, GRADE))";
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// Execute the command.
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cmd.ExecuteNonQuery();
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}
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public void InsertCoin(Coin coin) {
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Console.WriteLine("Inserting coin...");
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// Use our existing connection to insert a coin to the database.
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if (!IsConnected) {
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// TODO Create a NotConnectedToDatabaseException
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Console.WriteLine("Not connected to database.");
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return;
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}
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// Create a SQL command.
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SQLiteCommand cmd = Connection.CreateCommand();
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cmd.CommandText =
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"INSERT INTO CollectionTable (PCGS_NUMBER, GRADE, YEAR," +
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"DENOMINATION, MINT_MARK, PRICE_GUIDE_VALUE, COIN_FACTS_LINK," +
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"MAJOR_VARIETY, MINOR_VARIETY, DIE_VARIETY, SERIES_NAME, CATEGORY, DESIGNATION," +
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"CERT_NUM, QUANTITY, NOTES) " +
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$"VALUES ('{coin.PCGSNo}', '{coin.Grade}', {coin.Year}, '{coin.Denomination}', '{coin.MintMark}', {coin.PriceGuideValue}," +
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$"'{coin.CoinFactsLink}', '{coin.MajorVariety}', '{coin.MinorVariety}', '{coin.DieVariety}', '{coin.SeriesName}', " +
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$"'{coin.Category}', '{coin.Designation}', {coin.CertificateNumber}, {coin.Quantity}, @Notes)";
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cmd.Parameters.AddWithValue("@Notes", coin.Notes);
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// Execute the command.
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cmd.ExecuteNonQuery();
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}
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public async void CreateCoin(int pcgsNumber, string grade, int quantity) {
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Console.WriteLine("Creating coin...");
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// Create a coin by calling the API, then insert it into the database.
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// First, check if the coin already exists - if it does, just update the quantity by adding the amount entered.
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var coin = GetCoin(pcgsNumber, grade);
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if (coin is not null) {
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coin.Quantity += quantity;
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SaveCoin("CollectionTable", coin);
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}
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else {
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// Build a new coin with the API and insert it.
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var newCoin = await _pcgsClient.GetCoinFactsByGrade(pcgsNumber, grade);
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newCoin.Quantity = quantity;
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InsertCoin(newCoin);
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}
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}
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public Coin? GetCoin(int pcgsNumber, string grade) {
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Console.WriteLine($"Getting coin {pcgsNumber}, {grade}...");
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int gradeInt = GetGradeFromString(grade);
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// Check the collection to see if the coin exists.
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// We can't make a more efficient algorithm since there's not really an ordering to the collection.
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foreach (var coin in Collection) {
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if (coin.PCGSNo == pcgsNumber.ToString() && coin.Grade.Contains(gradeInt.ToString())) { // This has the possibility of a false positive for single digit grades.
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if (gradeInt < 10)
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if (char.IsDigit(coin.Grade[3])) continue; // TODO For right now, we're going to assume that the first 2 characters are ciruclation strings, and the next 2 are grade numbers.
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Console.WriteLine("Found coin.");
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return coin;
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}
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}
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Console.WriteLine("Couldn't find coin.");
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return null;
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}
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public void GetCollection(string collectionName) {
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Console.WriteLine("Getting collection...");
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SQLiteCommand cmd = Connection.CreateCommand();
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cmd.CommandText = $"SELECT * FROM {collectionName}";
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using (var reader = cmd.ExecuteReader()) {
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while (reader.Read()) {
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// Create coin from reader then add to list.
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Collection.Add(CoinFromReader(reader));
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}
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}
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}
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public String CollectionToCSV(string collectionName) {
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var cmd = Connection.CreateCommand();
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cmd.CommandText = $"SELECT * FROM {collectionName}";
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var headersCommand = Connection.CreateCommand();
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headersCommand.CommandText = $"PRAGMA table_info({collectionName})";
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var resultString = "";
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var numHeaders = 0;
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// Get the headers.
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using (var reader = headersCommand.ExecuteReader()) {
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while (reader.Read()) {
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resultString += reader.GetString(1) + ",";
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numHeaders++;
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}
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}
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resultString += "\n";
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// Is there a more efficient way of doing this? This is running at O(n^2) time.
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using (var reader = cmd.ExecuteReader()) {
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while (reader.Read()) {
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// Read information from the reader, then add to CSV string.
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for (int i = 0; i < numHeaders; i++) {
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// Get the type of each column.
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var type = reader.GetFieldType(i);
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Console.WriteLine("Type: " + type);
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if (type == typeof(Int64)) {
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resultString += reader.GetInt32(i) + ",";
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}
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else if (type == typeof(Double)) {
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resultString += reader.GetDouble(i) + ",";
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}
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else if (type == typeof(String)) {
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resultString += reader.GetString(i) + ",";
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}
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else {
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resultString += "NULL" + ",";
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}
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}
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resultString += "\n";
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}
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}
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return resultString;
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}
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public void SaveCoin(string collectionName, Coin coin) {
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// Get and replace the coin from the database.
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Console.WriteLine("Saving coin...");
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SQLiteCommand cmd = Connection.CreateCommand();
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cmd.CommandText = $"UPDATE {collectionName} " +
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$"SET YEAR = {coin.Year}, " +
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$"DENOMINATION = \'{coin.Denomination}\', " +
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$"MINT_MARK = \'{coin.MintMark}\', " +
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$"PRICE_GUIDE_VALUE = \'{coin.PriceGuideValue}\', " +
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$"COIN_FACTS_LINK = \'{coin.CoinFactsLink}\', " +
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$"MAJOR_VARIETY = \'{coin.MajorVariety}\', " +
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$"MINOR_VARIETY = \'{coin.MinorVariety}\', " +
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$"DIE_VARIETY = \'{coin.DieVariety}\', " +
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$"SERIES_NAME = \'{coin.SeriesName}\', " +
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$"CATEGORY = \'{coin.Category}\', " +
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$"DESIGNATION = \'{coin.Designation}\', " +
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$"CERT_NUM = \'{coin.CertificateNumber}\', " +
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$"QUANTITY = {coin.Quantity}, " +
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$"NOTES = @Notes " +
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$"WHERE PCGS_NUMBER = {coin.PCGSNo} AND GRADE = \'{coin.Grade}\'";
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cmd.Parameters.AddWithValue("@Notes", coin.Notes);
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Console.WriteLine(cmd.CommandText);
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// Execute the command.
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cmd.ExecuteNonQuery();
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}
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public void UpdateCollection(string collectionName) {
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// Update the database with the contents of the collection.
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// TODO This is a very inefficient way of doing this. I should be able to do this in one command.
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foreach (var coin in Collection) {
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SaveCoin(collectionName, coin); // CAREFUL! This will not create a coin if it doesn't currently exist.
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}
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}
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private Coin CoinFromReader(SQLiteDataReader reader) {
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// Create a coin while filtering out any possible null values - they throw exceptions.
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Coin coin = new Coin();
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if (!reader.IsDBNull(0)) coin.PCGSNo = reader.GetString(0);
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if (!reader.IsDBNull(1)) coin.Grade = reader.GetString(1);
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if (!reader.IsDBNull(2)) coin.Year = reader.GetInt32(2);
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if (!reader.IsDBNull(3)) coin.Denomination = reader.GetString(3);
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if (!reader.IsDBNull(4)) coin.MintMark = reader.GetString(4);
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if (!reader.IsDBNull(5)) coin.PriceGuideValue = reader.GetDouble(5);
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if (!reader.IsDBNull(6)) coin.CoinFactsLink = reader.GetString(6);
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if (!reader.IsDBNull(7)) coin.MajorVariety = reader.GetString(7);
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if (!reader.IsDBNull(8)) coin.MinorVariety = reader.GetString(8);
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if (!reader.IsDBNull(9)) coin.DieVariety = reader.GetString(9);
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if (!reader.IsDBNull(10)) coin.SeriesName = reader.GetString(10);
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if (!reader.IsDBNull(11)) coin.Category = reader.GetString(11);
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if (!reader.IsDBNull(12)) coin.Designation = reader.GetString(12);
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if (!reader.IsDBNull(13)) coin.CertificateNumber = reader.GetInt32(13);
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if (!reader.IsDBNull(14)) coin.Quantity = reader.GetInt32(14);
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if (!reader.IsDBNull(15)) coin.Notes = reader.GetString(15);
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coin.TotalPrice = coin.Quantity * coin.PriceGuideValue;
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return coin;
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}
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public void DeleteCoin(Coin delCoin) {
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SQLiteCommand cmd = Connection.CreateCommand();
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cmd.CommandText = "DELETE FROM CollectionTable WHERE PCGS_NUMBER = @PcgsNumber AND GRADE = @Grade";
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cmd.Parameters.AddWithValue("@PcgsNumber", delCoin.PCGSNo);
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cmd.Parameters.AddWithValue("@Grade", delCoin.Grade);
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cmd.ExecuteNonQuery();
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}
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private int GetGradeFromString(string grade) {
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var actualGrade = int.Parse(grade.Substring(grade.Length - 2));
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Console.WriteLine($"Grade is {actualGrade}");
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return actualGrade;
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}
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} |