/// <summary>
/// Delete the object from the database.
/// </summary>
/// <param name="settings">The settings to the access database.</param>
/// <param name="type">The type to be deleted.</param>
/// <param name="id">The item id to delete.</param>
internal static void Delete(AccessSettings settings, Type type, int id)
{
AccessTableAttribute attr = type.GetCustomAttribute <AccessTableAttribute>();
if (attr != null)
{
AccessWrapper.ExecuteDatabase(settings, $"DELETE FROM [{attr.Table}] WHERE [{attr.Key}] = @id", new Dictionary <string, object>()
{
{ "@id", id }
});
}
}
/// <summary>
/// Add a value to the db.
/// </summary>
/// <param name="settings">The access settings.</param>
/// <param name="type">The type to add.</param>
/// <param name="item">The item to add.</param>
/// <returns>Returns the item id to add, or null if it wasn't.</returns>
internal static int?Add(AccessSettings settings, Type type, object item)
{
AccessTableAttribute typeAttr = type.GetCustomAttribute <AccessTableAttribute>();
int?id = null;
if (typeAttr != null)
{
string columns = string.Empty;
string values = string.Empty;
Dictionary <string, object> data = new Dictionary <string, object>();
foreach (PropertyInfo prop in type.GetProperties())
{
AccessColumnAttribute dataAttr = prop.GetCustomAttribute <AccessColumnAttribute>();
if (dataAttr != null)
{
if (!dataAttr.IsReadonly)
{
string cleanName = prop.Name;
Object value = prop.GetValue(item);
if (value != null)
{
columns += (string.IsNullOrWhiteSpace(columns) ? "" : ",") + $"[{dataAttr.Name}]";
values += (string.IsNullOrWhiteSpace(values)? "" : ",") + $"@{prop.Name}";
data.Add(prop.Name, value);
}
}
}
}
AccessWrapper.ExecuteDatabase(settings, $"INSERT INTO [{typeAttr.Table}] ({columns}) VALUES ({values})", data, (command) =>
{
command.ExecuteNonQuery();
id = AccessWrapper.QueryDatabase <int?>(settings, $"SELECT TOP 1 * FROM [{typeAttr.Table}] ORDER BY [{typeAttr.Key}] DESC", (ids) =>
{
ids.Read();
return(ids.GetInt32(0));
});
});
}
return(id);
}
/// <summary>
/// Modify a value.
/// </summary>
/// <param name="settings">The settings to the access database.</param>
/// <param name="type">The values type.</param>
/// <param name="id">The item id to modify.</param>
/// <param name="item">This values to modify</param>
internal static void Modify(AccessSettings settings, Type type, int id, object item)
{
AccessTableAttribute typeAttr = type.GetCustomAttribute <AccessTableAttribute>();
if (typeAttr != null)
{
string setValues = string.Empty;
Dictionary <string, object> data = new Dictionary <string, object>();
if (item != null)
{
foreach (PropertyInfo prop in type.GetProperties())
{
AccessColumnAttribute dataAttr = prop.GetCustomAttribute <AccessColumnAttribute>();
if (dataAttr != null)
{
if (!dataAttr.IsReadonly)
{
string cleanName = prop.Name;
Object value = prop.GetValue(item);
if (value != null)
{
setValues += (string.IsNullOrWhiteSpace(setValues) ? "" : ",") + $"[{dataAttr.Name}] = @{prop.Name}";
data.Add(prop.Name, value);
}
}
}
}
}
if (!string.IsNullOrWhiteSpace(setValues))
{
AccessWrapper.ExecuteDatabase(settings, $"UPDATE [{typeAttr.Table}] SET {setValues} WHERE [{typeAttr.Key}] = @1", data);
}
else
{
throw new ArgumentException("No arguments.");
}
}
}
/// <summary>
/// Get a specific object type.
/// </summary>
/// <param name="settings">The settings to the access database.</param>
/// <param name="type">The resulting object type.</param>
/// <param name="id">The item id to return, if this has no value return the entire collection.</param>
/// <returns>The collection of object.</returns>
internal static List <object> Get(AccessSettings settings, Type type, int?id)
{
AccessTableAttribute attr = type.GetCustomAttribute <AccessTableAttribute>();
List <object> result = null;
if (attr != null)
{
string sql = $"SELECT * FROM [{attr.Table}]";
Dictionary <string, object> data = null;
if (id.HasValue)
{
sql += $" WHERE {attr.Key} = @1";
data = new Dictionary <string, object>()
{
{ "@1", id }
};
}
result = AccessWrapper.QueryDatabase(
settings,
sql,
data,
(reader) =>
{
List <object> output = new List <object>();
while (reader.Read())
{
object t = AccessWrapper.Deserialize(type, reader);
output.Add(t);
}
return(output);
});
}
return(result);
}
