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342 lines
12 KiB
C#
342 lines
12 KiB
C#
/******************************************************************************
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// Canary Islands Computer Museum Website
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// ----------------------------------------------------------------------------
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//
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// Filename : Machine.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Contains operations to manage machines.
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//
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// --[ License ] --------------------------------------------------------------
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//
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// ----------------------------------------------------------------------------
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// Copyright © 2003-2018 Natalia Portillo
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*******************************************************************************/
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using System;
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using System.Collections.Generic;
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using System.Data;
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using Cicm.Database.Schemas;
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namespace Cicm.Database
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{
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public partial class Operations
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{
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/// <summary>
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/// Gets all machines
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/// </summary>
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/// <param name="entries">All machines</param>
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/// <returns><c>true</c> if <see cref="entries" /> is correct, <c>false</c> otherwise</returns>
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public bool GetMachines(out List<Machine> entries)
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{
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#if DEBUG
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Console.WriteLine("Getting all machines...");
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#endif
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try
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{
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const string SQL = "SELECT * from machines";
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IDbCommand dbCmd = dbCon.CreateCommand();
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IDbDataAdapter dataAdapter = dbCore.GetNewDataAdapter();
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dbCmd.CommandText = SQL;
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DataSet dataSet = new DataSet();
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dataAdapter.SelectCommand = dbCmd;
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dataAdapter.Fill(dataSet);
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entries = MachinesFromDataTable(dataSet.Tables[0]);
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return true;
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}
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catch(Exception ex)
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{
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Console.WriteLine("Error getting machines.");
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Console.WriteLine(ex);
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entries = null;
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return false;
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}
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}
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/// <summary>
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/// Gets all machines from specified company
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/// </summary>
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/// <param name="entries">All machines</param>
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/// <param name="company">Company id</param>
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/// <returns><c>true</c> if <see cref="entries" /> is correct, <c>false</c> otherwise</returns>
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public bool GetMachines(out List<Machine> entries, int company)
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{
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#if DEBUG
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Console.WriteLine("Getting all machines from company id {0}...", company);
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#endif
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try
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{
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string sql = $"SELECT * from machines WHERE company = '{company}'";
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IDbCommand dbCmd = dbCon.CreateCommand();
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IDbDataAdapter dataAdapter = dbCore.GetNewDataAdapter();
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dbCmd.CommandText = sql;
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DataSet dataSet = new DataSet();
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dataAdapter.SelectCommand = dbCmd;
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dataAdapter.Fill(dataSet);
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entries = MachinesFromDataTable(dataSet.Tables[0]);
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return true;
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}
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catch(Exception ex)
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{
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Console.WriteLine("Error getting machines.");
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Console.WriteLine(ex);
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entries = null;
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return false;
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}
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}
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/// <summary>
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/// Gets the specified number of machines since the specified start
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/// </summary>
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/// <param name="entries">List of machines</param>
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/// <param name="start">Start of query</param>
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/// <param name="count">How many entries to retrieve</param>
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/// <returns><c>true</c> if <see cref="entries" /> is correct, <c>false</c> otherwise</returns>
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public bool GetMachines(out List<Machine> entries, ulong start, ulong count)
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{
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#if DEBUG
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Console.WriteLine("Getting {0} machines from {1}...", count, start);
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#endif
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try
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{
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string sql = $"SELECT * FROM machines LIMIT {start}, {count}";
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IDbCommand dbCmd = dbCon.CreateCommand();
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IDbDataAdapter dataAdapter = dbCore.GetNewDataAdapter();
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dbCmd.CommandText = sql;
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DataSet dataSet = new DataSet();
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dataAdapter.SelectCommand = dbCmd;
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dataAdapter.Fill(dataSet);
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entries = MachinesFromDataTable(dataSet.Tables[0]);
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return true;
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}
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catch(Exception ex)
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{
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Console.WriteLine("Error getting machines.");
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Console.WriteLine(ex);
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entries = null;
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return false;
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}
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}
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/// <summary>
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/// Gets machine by specified id
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/// </summary>
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/// <param name="id">Id</param>
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/// <returns>Machine with specified id, <c>null</c> if not found or error</returns>
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public Machine GetMachine(int id)
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{
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#if DEBUG
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Console.WriteLine("Getting machine with id {0}...", id);
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#endif
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try
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{
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string sql = $"SELECT * from machines WHERE id = '{id}'";
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IDbCommand dbCmd = dbCon.CreateCommand();
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IDbDataAdapter dataAdapter = dbCore.GetNewDataAdapter();
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dbCmd.CommandText = sql;
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DataSet dataSet = new DataSet();
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dataAdapter.SelectCommand = dbCmd;
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dataAdapter.Fill(dataSet);
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List<Machine> entries = MachinesFromDataTable(dataSet.Tables[0]);
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return entries == null || entries.Count == 0 ? null : entries[0];
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}
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catch(Exception ex)
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{
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Console.WriteLine("Error getting machine.");
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Console.WriteLine(ex);
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return null;
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}
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}
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/// <summary>
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/// Counts the number of machines in the database
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/// </summary>
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/// <returns>Entries in database</returns>
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public long CountMachines()
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{
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#if DEBUG
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Console.WriteLine("Counting machines...");
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#endif
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IDbCommand dbcmd = dbCon.CreateCommand();
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dbcmd.CommandText = "SELECT COUNT(*) FROM machines";
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object count = dbcmd.ExecuteScalar();
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dbcmd.Dispose();
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try { return Convert.ToInt64(count); }
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catch { return 0; }
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}
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/// <summary>
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/// Adds a new administrator to the database
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/// </summary>
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/// <param name="entry">Entry to add</param>
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/// <param name="id">ID of added entry</param>
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/// <returns><c>true</c> if added correctly, <c>false</c> otherwise</returns>
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public bool AddMachine(Machine entry, out long id)
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{
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#if DEBUG
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Console.Write("Adding machine `{0}`...", entry.Model);
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#endif
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IDbCommand dbcmd = GetCommandMachine(entry);
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IDbTransaction trans = dbCon.BeginTransaction();
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dbcmd.Transaction = trans;
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const string SQL =
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"INSERT INTO machines (company, introduced, model, type) VALUES (@company, @introduced, @model, @type)";
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dbcmd.CommandText = SQL;
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dbcmd.ExecuteNonQuery();
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trans.Commit();
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dbcmd.Dispose();
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id = dbCore.LastInsertRowId;
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#if DEBUG
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Console.WriteLine(" id {0}", id);
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#endif
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return true;
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}
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/// <summary>
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/// Updated a machine in the database
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/// </summary>
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/// <param name="entry">Updated entry</param>
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/// <returns><c>true</c> if updated correctly, <c>false</c> otherwise</returns>
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public bool UpdateMachine(Machine entry)
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{
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#if DEBUG
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Console.WriteLine("Updating machine `{0}`...", entry.Model);
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#endif
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IDbCommand dbcmd = GetCommandMachine(entry);
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IDbTransaction trans = dbCon.BeginTransaction();
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dbcmd.Transaction = trans;
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string sql =
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"UPDATE machines SET company = @company, introduced = @introduced, model = @model, type = @type " +
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$"WHERE id = {entry.Id}";
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dbcmd.CommandText = sql;
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dbcmd.ExecuteNonQuery();
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trans.Commit();
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dbcmd.Dispose();
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return true;
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}
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/// <summary>
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/// Removes a machine from the database
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/// </summary>
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/// <param name="id">ID of entry to remove</param>
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/// <returns><c>true</c> if removed correctly, <c>false</c> otherwise</returns>
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public bool RemoveMachine(long id)
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{
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#if DEBUG
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Console.WriteLine("Removing machine widh id `{0}`...", id);
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#endif
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IDbCommand dbcmd = dbCon.CreateCommand();
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IDbTransaction trans = dbCon.BeginTransaction();
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dbcmd.Transaction = trans;
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string sql = $"DELETE FROM machines WHERE id = '{id}';";
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dbcmd.CommandText = sql;
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dbcmd.ExecuteNonQuery();
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trans.Commit();
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dbcmd.Dispose();
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return true;
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}
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IDbCommand GetCommandMachine(Machine entry)
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{
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IDbCommand dbcmd = dbCon.CreateCommand();
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IDbDataParameter param1 = dbcmd.CreateParameter();
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IDbDataParameter param2 = dbcmd.CreateParameter();
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IDbDataParameter param3 = dbcmd.CreateParameter();
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IDbDataParameter param4 = dbcmd.CreateParameter();
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param1.ParameterName = "@company";
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param2.ParameterName = "@introduced";
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param3.ParameterName = "@model";
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param4.ParameterName = "@type";
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param1.DbType = DbType.Int32;
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param2.DbType = DbType.DateTime;
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param3.DbType = DbType.String;
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param4.DbType = DbType.Int32;
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param1.Value = entry.Company;
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param2.Value = entry.Introduced;
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param3.Value = entry.Model;
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param4.Value = entry.Type;
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dbcmd.Parameters.Add(param1);
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dbcmd.Parameters.Add(param2);
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dbcmd.Parameters.Add(param3);
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dbcmd.Parameters.Add(param4);
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return dbcmd;
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}
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static List<Machine> MachinesFromDataTable(DataTable dataTable)
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{
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List<Machine> entries = new List<Machine>();
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foreach(DataRow dataRow in dataTable.Rows)
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{
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Machine entry = new Machine
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{
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Id = (int)dataRow["id"],
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Company = (int)dataRow["company"],
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Introduced =
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dataRow["introduced"] == DBNull.Value ? DateTime.MinValue : (DateTime)dataRow["introduced"],
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Model = (string)dataRow["model"],
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Type = (MachineType)dataRow["type"]
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};
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entries.Add(entry);
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}
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return entries;
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}
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}
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} |