protected Table()
{
var link = GetType().GetCustomAttribute <TableLink>(false);
if (link != null)
{
Identifier = link.TableName;
if (link.DatabaseType != null && SqlManager.TrySearchDatabase(link.DatabaseType, out Database db))
{
Database = db;
}
if (Database == null)
{
throw new ArgumentNullException($"The database isn't registered for table '{ link.TableName }'");
}
}
}
/// <summary>
/// Selects the first element from the specified <see cref="Table"/> with the specified parameters and returns an instance of the <typeparamref name="T"/>.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="columnsToSelect"></param>
/// <param name="condition"></param>
/// <param name="distinct"></param>
/// <returns></returns>
public T Select <T>(SqlCondition condition, bool distinct, params string[] columnsToSelect) where T : Table
{
T table = null;
ExecuteCommand((cmd) => {
if (SqlManager.CreateTableInstance(out table))
{
if (condition == null)
{
condition = new SqlCondition();
}
condition.Limit(1);
var fields = Table.GetFields <T>();
cmd.SetQuery(QueryBuilder.GetSelectQuery(table, condition, columnsToSelect, distinct), condition);
cmd.OnReader((reader) => {
for (var i = 0; i < reader.FieldCount; i++)
{
var field = fields.FirstOrDefault((f) => f.Name == reader.GetName(i));
if (field != null)
{
object value = null;
if (field.FieldType == typeof(bool))
{
value = reader.GetBoolean(i);
}
else if (!reader.IsDBNull(i))
{
value = reader.GetValue(i);
}
field.SetValue(table, value);
}
}
});
}
});
return(table);
}
public T Min <T>(string columnName, SqlCondition condition) where T : Table
{
T table = null;
ExecuteCommand((cmd) => {
if (SqlManager.CreateTableInstance(out table))
{
cmd.SetQuery(QueryBuilder.GetMinQuery(table, columnName, condition), condition);
cmd.OnReader((reader) => {
var field = Table.GetFields <T>().FirstOrDefault((f) => f.Name == columnName);
if (field != null)
{
field.SetValue(table, reader.GetValue(0));
}
});
}
});
return(table);
}
/// <summary>
/// Insert the current instance values in <see cref="Database"/>
/// </summary>
/// <returns></returns>
public void InsertAsync(BasicAction <long> onResult)
{
SqlManager.PoolAsyncOperation(() => {
onResult(Insert());
});
}
/// <summary>
/// Update all elements in the <see cref="Database"/> with current instance's values using the specified <see cref="SqlCondition"/>
/// </summary>
/// <param name="condition"></param>
/// <param name="onUpdated"></param>
/// <param name="columnsToUpdate"></param>
public void UpdateAsync(SqlCondition condition, BasicAction <bool> onUpdated, params string[] columnsToUpdate)
{
SqlManager.PoolAsyncOperation(() => {
onUpdated(Update(condition, columnsToUpdate));
});
}
