/*
* /// <summary>
* /// Returns a reader for the specified amount of rows for the specified entity type.
* /// </summary>
* /// <typeparam name="T">The type of entity to be queried.</typeparam>
* /// <param name="condition">An optional condition to allow querying for specific rows. Leave at null to query all rows.</param>
* /// <param name="amountOfRows">The amount of rows to be returned (maximum). Leave at -1 to query all rows.</param>
* /// <returns>A DbDataReader that has tried to query rows for entities of type T.</returns>
* internal DbDataReader GetReader<T>(BuiltSqlCondition condition = null, int amountOfRows = -1)
* {
* return GetReader(typeof(T), condition, amountOfRows);
* }
*
* /// <summary>
* /// Returns a reader for the specified amount of rows for the specified entity type.
* /// </summary>
* /// <param name="entityType">The type of entity to be queried.</param>
* /// <param name="condition">An optional condition to allow querying for specific rows. Leave at null to query all rows.</param>
* /// <param name="amountOfRows">The amount of rows to be returned (maximum). Leave at -1 to query all rows.</param>
* /// <returns>A DbDataReader that has tried to query rows for entities of type T.</returns>
* internal DbDataReader GetReader(Type entityType, BuiltSqlCondition condition = null, int amountOfRows = -1)
* {
* var select = SqlBuild.Select(entityType);
*
* if (condition != null)
* select.Condition = condition;
*
* if (amountOfRows > 0)
* select.Limit(amountOfRows);
*
* return select.GenerateCommand(_connection).ExecuteReader();
* }
*
* /// <summary>
* /// Returns a reader for the specified amount of rows for the specified entity type.
* /// </summary>
* /// <param name="entityType">The type of entity to be queried.</param>
* /// <param name="commandString">The command to execute to create the reader.</param>
* /// <returns>A DbDataReader that has tried to query rows for entities of type entityType.</returns>
* internal DbDataReader GetReader(Type entityType, string commandString)
* {
* using (var command = _connection.CreateCommand())
* {
* command.CommandText = commandString;
* return command.ExecuteReader();
* }
* }
*/
/// <summary>
/// Fetches and initializes all available rows for entities of type T.
/// </summary>
/// <typeparam name="T">The type of entity to be queried.</typeparam>
/// <param name="condition">An optional condition to allow querying for specific rows. Leave at null to query all rows.</param>
/// <returns>An enumerable of constructed entities of type T.</returns>
public IEnumerable <T> All <T>(BuiltSqlCondition condition = null) where T : new()
{
var command = _connection.CreateCommand();
command.CommandText = SqlBuild.Select <T>().GenerateStatement();
condition?.GenerateCommand(command);
var reader = command.ExecuteReader();
List <T> resultSet = new List <T>();
while (reader.Read())
{
resultSet.Add(BuildSingle <T>(reader));
}
command.Dispose();
return(resultSet);
}
/// <summary>
/// Fetches and initializes the specified number of rows for entities of type T.
/// </summary>
/// <typeparam name="T">The type of entity to be queried.</typeparam>
/// <param name="condition">An optional condition to allow querying for specific rows. Leave at null to query all rows.</param>
/// <param name="amountOfRows">The amount of rows to be queried (maximum).</param>
/// <returns>An enumerable of constructed entities of type T.</returns>
public IEnumerable <T> Fetch <T>(BuiltSqlCondition condition, int amountOfRows = -1) where T : new()
{
var select = SqlBuild.Select <T>();
select.Condition = condition;
if (amountOfRows != -1)
{
if (ProviderSpecific.SupportsLimit)
{
select.Limit(amountOfRows);
}
}
var command = select.GenerateCommand(_connection);
var reader = command.ExecuteReader();
List <T> resultSet = new List <T>();
if (!ProviderSpecific.SupportsLimit && amountOfRows != -1)
{
int rows = 0;
while (reader.Read() && rows < amountOfRows)
{
resultSet.Add(BuildSingle <T>(reader));
rows++;
}
}
else
{
while (reader.Read())
{
resultSet.Add(BuildSingle <T>(reader));
}
}
command.Dispose();
return(resultSet);
//var reader = GetReader<T>(condition, amountOfRows);
//List<T> resultSet = new List<T>();
while (reader.Read())
{
resultSet.Add(BuildSingle <T>(reader));
}
return(resultSet);
}
/// <summary>
/// Adds a condition to apply to this DELETE command.
/// </summary>
public BuiltDeleteCommand Where(BuiltSqlCondition condition)
{
_condition = condition;
return(this);
}
/// <summary>
/// Creates a WHERE clause for this BuiltSqlCommand.
/// Calling this twice on a BuiltSelectCommand will overwrite the first call.
/// </summary>
public BuiltSelectCommand Where(BuiltSqlCondition condition)
{
Condition = condition;
return(this);
}
/// <summary>
/// Fetches and initializes a single row for entities of type T.
/// </summary>
/// <typeparam name="T">The type of entity to be queried.</typeparam>
/// <param name="condition">An optional condition to allow querying for specific rows. Leave at null to query all rows.</param>
/// <returns>The constructed entity of type T.</returns>
public T Single <T>(BuiltSqlCondition condition = null) where T : new()
{
return(Fetch <T>(condition, 1).FirstOrDefault());
}
/// <summary>
/// Sets a condition to limit which datasets are updated.
/// </summary>
/// <param name="condition">The condition to be used.</param>
public BuiltUpdateCommand <T> Where(BuiltSqlCondition condition)
{
_condition = condition;
return(this);
}