mirror of
https://github.com/claunia/marechai.git
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281 lines
9.0 KiB
C#
281 lines
9.0 KiB
C#
/******************************************************************************
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// Canary Islands Computer Museum Website
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// ----------------------------------------------------------------------------
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//
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// Filename : Dsp.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 DSPs.
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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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using Console = System.Console;
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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 DSPs
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/// </summary>
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/// <param name="entries">All DSPs</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 GetDsps(out List<Dsp> entries)
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{
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#if DEBUG
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Console.WriteLine("Getting all DSPs...");
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#endif
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try
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{
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const string SQL = "SELECT * from DSPs";
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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 = DspsFromDataTable(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 DSPs.");
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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 DSPs since the specified start
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/// </summary>
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/// <param name="entries">List of DSPs</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 GetDsps(out List<Dsp> entries, ulong start, ulong count)
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{
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#if DEBUG
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Console.WriteLine("Getting {0} DSPs 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 DSPs 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 = DspsFromDataTable(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 DSPs.");
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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 DSP by specified id
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/// </summary>
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/// <param name="id">Id</param>
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/// <returns>DSP with specified id, <c>null</c> if not found or error</returns>
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public Dsp GetDsp(int id)
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{
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#if DEBUG
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Console.WriteLine("Getting DSP 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 DSPs 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<Dsp> entries = DspsFromDataTable(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 DSP.");
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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 DSPs in the database
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/// </summary>
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/// <returns>Entries in database</returns>
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public long CountDsps()
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{
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#if DEBUG
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Console.WriteLine("Counting DSPs...");
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#endif
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IDbCommand dbcmd = dbCon.CreateCommand();
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dbcmd.CommandText = "SELECT COUNT(*) FROM DSPs";
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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 DSP 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 AddDsp(Dsp entry, out long id)
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{
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#if DEBUG
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Console.Write("Adding DSP `{0}`...", entry.Name);
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#endif
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IDbCommand dbcmd = GetCommandDsp(entry);
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IDbTransaction trans = dbCon.BeginTransaction();
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dbcmd.Transaction = trans;
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const string SQL = "INSERT INTO DSPs (DSP)" + " VALUES (@DSP)";
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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 DSP 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 UpdateDsp(Dsp entry)
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{
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#if DEBUG
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Console.WriteLine("Updating DSP `{0}`...", entry.Name);
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#endif
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IDbCommand dbcmd = GetCommandDsp(entry);
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IDbTransaction trans = dbCon.BeginTransaction();
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dbcmd.Transaction = trans;
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string sql = "UPDATE DSPs SET DSP = @DSP " + $"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 DSP 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 RemoveDsp(long id)
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{
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#if DEBUG
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Console.WriteLine("Removing DSP 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 DSPs 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 GetCommandDsp(Dsp 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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param1.ParameterName = "@DSP";
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param1.DbType = DbType.String;
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param1.Value = entry.Name;
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dbcmd.Parameters.Add(param1);
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return dbcmd;
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}
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static List<Dsp> DspsFromDataTable(DataTable dataTable)
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{
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List<Dsp> entries = new List<Dsp>();
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foreach(DataRow dataRow in dataTable.Rows)
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{
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Dsp entry = new Dsp {Id = int.Parse(dataRow["id"].ToString()), Name = dataRow["DSP"].ToString()};
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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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} |