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DataAccess.cs
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DataAccess.cs
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using System;
using System.Collections.Generic;
using System.IO;
using Microsoft.Data.Sqlite;
using Windows.Storage;
namespace Pane
{
public static class DataAccess
{
const string DBTEMPLATE = "(\"Key\" INTEGER NOT NULL UNIQUE," +
"\"Name\" TEXT NOT NULL UNIQUE," +
"\"TotalWeight\" REAL," +
"\"FlourWeight\" REAL," +
"\"WaterWeight\" REAL," +
"\"SaltWeight\" REAL," +
"\"OtherDryWeight\" REAL," +
"\"OtherWetWeight\" REAL," +
"\"Ratio\" REAL," +
"\"SaltPercent\" REAL," +
"\"OtherDryPercent\" REAL," +
"\"TotalDryWeight\" REAL," +
"\"TotalWetWeight\" REAL," +
"\"Notes\" TEXT," +
"PRIMARY KEY(\"key\" AUTOINCREMENT));";
public async static void InitializeDatabase()
{
await ApplicationData.Current.LocalFolder.CreateFileAsync("BreadRecipes.db", CreationCollisionOption.OpenIfExists);
string dbpath = Path.Combine(ApplicationData.Current.LocalFolder.Path, "BreadRecipes.db");
using (SqliteConnection db = new SqliteConnection($"Filename={dbpath}"))
{
db.Open();
String tableCommandOne = "CREATE TABLE IF NOT EXISTS \"recipeTable\"" + DBTEMPLATE;
SqliteCommand createTableOne = new SqliteCommand(tableCommandOne, db);
createTableOne.ExecuteReader();
String tableCommandTwo = "CREATE TABLE IF NOT EXISTS \"persistenceTable\"" + DBTEMPLATE;
SqliteCommand createTableTwo = new SqliteCommand(tableCommandTwo, db);
createTableTwo.ExecuteReader();
}
}
public static Loaf GetPreviousState()
{
// Called when loaded after Initializing database to load previous state
// To keep persistence
List<string> lastEntry = GetRecipeListFromDatabase("persistenceTable");
if (lastEntry.Count != 1)
{
//Nothing to load
Loaf newLoaf = new Loaf();
return newLoaf;
}
else
{
Loaf previousLoaf = GetRecipeFromDatabaseByName(lastEntry[0], "persistenceTable");
return previousLoaf;
}
}
public static void SaveCurrentState(Loaf saveLoaf = null)
{
if (saveLoaf != null)
{
// Saves the current state as the only entry in persistenceTable
ClearAllDataFromPersistenceTable();
AddEntryToDatabase(saveLoaf, "persistenceTable");
}
else
{
ClearAllDataFromPersistenceTable();
Loaf currentLoaf = new Loaf();
AddEntryToDatabase(currentLoaf, "persistenceTable");
}
}
public static void DeleteEntryFromDatabaseByName(Loaf currentLoaf, string table)
{
// Deletes the database entry of the selected item in ListView
if (currentLoaf == null || currentLoaf.RecipeName == "")
{
//No loaf to delete display error dialogue
throw new SqliteException("Error", 1);
}
else
{
string dbpath = Path.Combine(ApplicationData.Current.LocalFolder.Path, "BreadRecipes.db");
using (SqliteConnection db = new SqliteConnection($"Filename={dbpath}"))
{
db.Open();
SqliteCommand deleteCommand = new SqliteCommand();
deleteCommand.Connection = db;
// Use parameterized query to prevent SQL injection attacks
deleteCommand.CommandText = "DELETE FROM " + table + " WHERE Name = @Name;";
deleteCommand.Parameters.AddWithValue("@Name", currentLoaf.RecipeName);
deleteCommand.ExecuteReader();
db.Close();
}
}
}
public static void OverwriteData(Loaf currentLoaf, string table)
{
DeleteEntryFromDatabaseByName(currentLoaf, table);
AddEntryToDatabase(currentLoaf, table);
}
public static void AddEntryToDatabase(Loaf currentLoaf, string table)
{
string dbpath = Path.Combine(ApplicationData.Current.LocalFolder.Path, "BreadRecipes.db");
using (SqliteConnection db = new SqliteConnection($"Filename={dbpath}"))
{
db.Open();
// Use parameterized query to prevent SQL injection attacks
SqliteCommand insertCommand = new SqliteCommand();
insertCommand.Connection = db;
insertCommand.CommandText = "INSERT INTO " + table + " VALUES (NULL,@Name,"+
"@TotalWeight, @FlourWeight, @WaterWeight, @SaltWeight, " +
"@OtherDryWeight, @OtherWetWeight, @Ratio, @SaltPercent, " +
"@OtherDryPercent, @TotalDryWeight, @TotalWetWeight, @Notes);";
insertCommand.Parameters.AddWithValue("@Name",currentLoaf.RecipeName);
insertCommand.Parameters.AddWithValue("@TotalWeight", currentLoaf.TotalWeight);
insertCommand.Parameters.AddWithValue("@FlourWeight", currentLoaf.FlourWeight);
insertCommand.Parameters.AddWithValue("@WaterWeight", currentLoaf.WaterWeight);
insertCommand.Parameters.AddWithValue("@SaltWeight", currentLoaf.SaltWeight);
insertCommand.Parameters.AddWithValue("@OtherDryWeight", currentLoaf.OtherDryWeight);
insertCommand.Parameters.AddWithValue("@OtherWetWeight", currentLoaf.OtherWetWeight);
insertCommand.Parameters.AddWithValue("@Ratio", currentLoaf.Ratio);
insertCommand.Parameters.AddWithValue("@SaltPercent", currentLoaf.SaltPercent);
insertCommand.Parameters.AddWithValue("@OtherDryPercent", currentLoaf.OtherDryPercent);
insertCommand.Parameters.AddWithValue("@TotalDryWeight", currentLoaf.TotalDryWeight);
insertCommand.Parameters.AddWithValue("@TotalWetWeight", currentLoaf.TotalWetWeight);
insertCommand.Parameters.AddWithValue("@Notes", currentLoaf.Notes);
try
{
insertCommand.ExecuteReader();
}
//Sqlite ErrorCode 19 - (Name) value is not unique but should be.
catch(SqliteException ex) when (ex.SqliteErrorCode == 19)
{
// Alert overwrite is done in view controller.
// So go ahead and overwrite
OverwriteData(currentLoaf, table);
}
db.Close();
}
}
private static void ClearAllDataFromPersistenceTable()
{
// Deletes all databaseNames from a specified table in the database
// BE CAREFUL! .
string dbpath = Path.Combine(ApplicationData.Current.LocalFolder.Path, "BreadRecipes.db");
using (SqliteConnection db = new SqliteConnection($"Filename={dbpath}"))
{
db.Open();
SqliteCommand deleteCommand = new SqliteCommand();
deleteCommand.Connection = db;
// Use parameterized query to prevent SQL injection attacks
deleteCommand.CommandText = "DELETE FROM persistenceTable;";
deleteCommand.ExecuteReader();
db.Close();
}
}
public static List<string> GetRecipeListFromDatabase(string table = "recipeTable")
{
List<String> databaseNames = new List<string>();
string dbpath = Path.Combine(ApplicationData.Current.LocalFolder.Path, "BreadRecipes.db");
using (SqliteConnection db =
new SqliteConnection($"Filename={dbpath}"))
{
db.Open();
SqliteCommand selectCommand = new SqliteCommand();
selectCommand.Connection = db;
// SQL command get the Name value of all databaseNames in the database
selectCommand.CommandText = "SELECT Name from " + table +" ;";
SqliteDataReader query = selectCommand.ExecuteReader();
while (query.Read())
{
//Add each Name to the databaseNames list
databaseNames.Add(query.GetString(0));
}
db.Close();
}
return databaseNames;
}
public static Loaf GetRecipeFromDatabaseByName(string recipeName, string table = "recipeTable")
{
Loaf currentLoaf = new Loaf();
string dbpath = Path.Combine(ApplicationData.Current.LocalFolder.Path, "BreadRecipes.db");
using (SqliteConnection db =
new SqliteConnection($"Filename={dbpath}"))
{
db.Open();
SqliteCommand selectCommand = new SqliteCommand();
selectCommand.Connection = db;
// Use parameterized query to prevent SQL injection attacks
selectCommand.CommandText = "SELECT * from " + table + " WHERE name = @Name;";
selectCommand.Parameters.AddWithValue("@Name", recipeName);
SqliteDataReader query = selectCommand.ExecuteReader();
if (query != null)
{
while (query.Read())
{
currentLoaf.Key = query.GetInt32(0);
currentLoaf.RecipeName = query.GetString(1);
currentLoaf.TotalWeight = query.GetFloat(2);
currentLoaf.FlourWeight = query.GetFloat(3);
currentLoaf.WaterWeight = query.GetFloat(4);
currentLoaf.SaltWeight = query.GetFloat(5);
currentLoaf.OtherDryWeight = query.GetFloat(6);
currentLoaf.OtherWetWeight = query.GetFloat(7);
currentLoaf.Ratio = query.GetFloat(8);
currentLoaf.SaltPercent = query.GetFloat(9);
currentLoaf.OtherDryPercent = query.GetFloat(10);
currentLoaf.TotalDryWeight = query.GetFloat(11);
currentLoaf.TotalWetWeight = query.GetFloat(12);
currentLoaf.Notes = query.GetString(13);
}
}
else throw new SqliteException("query = NULL! Could not populate currentLoaf", 1);
db.Close();
}
return currentLoaf;
}
}
}