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DatabaseQuery.cs
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DatabaseQuery.cs
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using System;
using System.Collections.Generic;
using System.Text;
using MySql.Data.MySqlClient;
namespace Sycorax {
/// <summary>
/// Query the database
/// </summary>
public class DatabaseQuery : IDisposable {
#region Constructor, Dispose(), properties
/// <summary>
/// Initializes a new instance of the <see cref="DatabaseQuery"/> class.
/// </summary>
/// <param name="connectionString">The connection string.</param>
public DatabaseQuery (string connectionString) {
conn = new MySqlConnection(connectionString);
conn.Open();
}
/// <summary>
/// MySQL connection
/// </summary>
private MySqlConnection conn;
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
public void Dispose () {
conn.Close();
conn.Dispose();
}
#endregion
#region Logging
/// <summary>
/// Logs a message
/// </summary>
/// <param name="message">message to log</param>
public void Log (string message) {
if (LogEntry != null) {
LogEntry(this, new TimestampMessageEventArgs(DateTime.Now, message));
}
}
public void SqlLog (string query) {
if (SqlQuery != null) {
SqlQuery(this, new TimestampMessageEventArgs(DateTime.Now, query));
}
}
public event EventHandler<TimestampMessageEventArgs> LogEntry;
public event EventHandler<TimestampMessageEventArgs> SqlQuery;
#endregion
#region Public methods
/// <summary>
/// Gets the tune info.
/// </summary>
/// <param name="path">The path to the tune.</param>
/// <returns>Tune info</returns>
/// <exception cref="System.Exception">throw if path is not found in database</exception>
public TuneToIndex GetTuneInfo (string path) {
bool notFoundException = true;
string sql = String.Format(
"SELECT t.tune_by, t.tune_title, t.tune_comment FROM tunes t, files f WHERE t.tune_id = f.file_id AND f.file_path '{0}'",
Utilities.SqlEscape(path)
);
TuneToIndex tune = new TuneToIndex();
tune.Path = path;
MySqlCommand cmd = new MySqlCommand(sql, conn);
MySqlDataReader reader = cmd.ExecuteReader();
if (reader.Read()) {
notFoundException = false;
tune.By = reader.GetString(0);
tune.Title = reader.GetString(1);
tune.Comment = reader.GetString(2);
}
reader.Close();
cmd.Dispose();
if (notFoundException) throw new Exception("Not found in database");
return tune;
}
#endregion
}
}

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