/// <summary>
/// Execute a query asynchronously using .NET 4.5 Task.
/// </summary>
public static Task <IEnumerable <object> > QueryAsync(this IDbConnection cnn, Type type, CommandDefinition command)
{
return(QueryAsync <object>(cnn, type, command));
}
private static async Task <IEnumerable <T> > QueryAsync <T>(this IDbConnection cnn, Type effectiveType, CommandDefinition command)
{
object param = command.Parameters;
var identity = new Identity(command.CommandText, command.CommandType, cnn, effectiveType, param == null ? null : param.GetType(), null);
var info = GetCacheInfo(identity, param, command.AddToCache);
bool wasClosed = cnn.State == ConnectionState.Closed;
var cancel = command.CancellationToken;
using (var cmd = (DbCommand)command.SetupCommand(cnn, info.ParamReader))
{
DbDataReader reader = null;
try
{
if (wasClosed)
{
await((DbConnection)cnn).OpenAsync(cancel).ConfigureAwait(false);
}
reader = await cmd.ExecuteReaderAsync(wasClosed?CommandBehavior.CloseConnection | CommandBehavior.SequentialAccess : CommandBehavior.SequentialAccess, cancel).ConfigureAwait(false);
var tuple = info.Deserializer;
int hash = GetColumnHash(reader);
if (tuple.Func == null || tuple.Hash != hash)
{
tuple = info.Deserializer = new DeserializerState(hash, GetDeserializer(effectiveType, reader, 0, -1, false));
if (command.AddToCache)
{
SetQueryCache(identity, info);
}
}
var func = tuple.Func;
if (command.Buffered)
{
List <T> buffer = new List <T>();
while (await reader.ReadAsync(cancel).ConfigureAwait(false))
{
buffer.Add((T)func(reader));
}
while (await reader.NextResultAsync().ConfigureAwait(false))
{
}
command.OnCompleted();
return(buffer);
}
else
{
// can't use ReadAsync / cancellation; but this will have to do
wasClosed = false; // don't close if handing back an open reader; rely on the command-behavior
var deferred = ExecuteReaderSync <T>(reader, func, command.Parameters);
reader = null; // to prevent it being disposed before the caller gets to see it
return(deferred);
}
}
finally
{
using (reader) { } // dispose if non-null
if (wasClosed)
{
cnn.Close();
}
}
}
}
private static async Task <IEnumerable <TReturn> > MultiMapAsync <TReturn>(this IDbConnection cnn, CommandDefinition command, Type[] types, Func <object[], TReturn> map, string splitOn)
{
if (types.Length < 1)
{
throw new ArgumentException("you must provide at least one type to deserialize");
}
object param = command.Parameters;
var identity = new Identity(command.CommandText, command.CommandType, cnn, types[0], param == null ? null : param.GetType(), types);
var info = GetCacheInfo(identity, param, command.AddToCache);
bool wasClosed = cnn.State == ConnectionState.Closed;
try {
if (wasClosed)
{
await((DbConnection)cnn).OpenAsync().ConfigureAwait(false);
}
using (var cmd = (DbCommand)command.SetupCommand(cnn, info.ParamReader))
using (var reader = await cmd.ExecuteReaderAsync(command.CancellationToken).ConfigureAwait(false)) {
var results = MultiMapImpl <TReturn>(null, default(CommandDefinition), types, map, splitOn, reader, identity, true);
return(command.Buffered ? results.ToList() : results);
}
}
finally {
if (wasClosed)
{
cnn.Close();
}
}
}
/// <summary>
/// Execute a query asynchronously using .NET 4.5 Task.
/// </summary>
public static Task <IEnumerable <T> > QueryAsync <T>(this IDbConnection cnn, CommandDefinition command)
{
return(QueryAsync <T>(cnn, typeof(T), command));
}
/// <summary>
/// Perform a multi mapping query with arbitrary input parameters
/// </summary>
/// <typeparam name="TReturn">The return type</typeparam>
/// <param name="cnn"></param>
/// <param name="sql"></param>
/// <param name="types">array of types in the recordset</param>
/// <param name="map"></param>
/// <param name="param"></param>
/// <param name="transaction"></param>
/// <param name="buffered"></param>
/// <param name="splitOn">The Field we should split and read the second object from (default: id)</param>
/// <param name="commandTimeout">Number of seconds before command execution timeout</param>
/// <param name="commandType">Is it a stored proc or a batch?</param>
/// <returns></returns>
public static Task <IEnumerable <TReturn> > QueryAsync <TReturn>(this IDbConnection cnn, string sql, Type[] types, Func <object[], TReturn> map, dynamic param = null, IDbTransaction transaction = null, bool buffered = true, string splitOn = "Id", int?commandTimeout = null, CommandType?commandType = null)
{
var command = new CommandDefinition(sql, (object)param, transaction, commandTimeout, commandType, buffered ? CommandFlags.Buffered : CommandFlags.None, default(CancellationToken));
return(MultiMapAsync <TReturn>(cnn, command, types, map, splitOn));
}
private static async Task <IEnumerable <TReturn> > MultiMapAsync <TFirst, TSecond, TThird, TFourth, TFifth, TSixth, TSeventh, TReturn>(this IDbConnection cnn, CommandDefinition command, Delegate map, string splitOn)
{
object param = command.Parameters;
var identity = new Identity(command.CommandText, command.CommandType, cnn, typeof(TFirst), param == null ? null : param.GetType(), new[] { typeof(TFirst), typeof(TSecond), typeof(TThird), typeof(TFourth), typeof(TFifth), typeof(TSixth), typeof(TSeventh) });
var info = GetCacheInfo(identity, param, command.AddToCache);
bool wasClosed = cnn.State == ConnectionState.Closed;
try
{
if (wasClosed)
{
await((DbConnection)cnn).OpenAsync(command.CancellationToken).ConfigureAwait(false);
}
using (var cmd = (DbCommand)command.SetupCommand(cnn, info.ParamReader))
using (var reader = await cmd.ExecuteReaderAsync(wasClosed ? CommandBehavior.CloseConnection | CommandBehavior.SequentialAccess : CommandBehavior.SequentialAccess, command.CancellationToken).ConfigureAwait(false))
{
if (!command.Buffered)
{
wasClosed = false; // handing back open reader; rely on command-behavior
}
var results = MultiMapImpl <TFirst, TSecond, TThird, TFourth, TFifth, TSixth, TSeventh, TReturn>(null, CommandDefinition.ForCallback(command.Parameters), map, splitOn, reader, identity, true);
return(command.Buffered ? results.ToList() : results);
}
} finally
{
if (wasClosed)
{
cnn.Close();
}
}
}
/// <summary>
/// Perform a multi mapping query with 7 input parameters
/// </summary>
public static Task <IEnumerable <TReturn> > QueryAsync <TFirst, TSecond, TThird, TFourth, TFifth, TSixth, TSeventh, TReturn>(this IDbConnection cnn, CommandDefinition command, Func <TFirst, TSecond, TThird, TFourth, TFifth, TSixth, TSeventh, TReturn> map, string splitOn = "Id")
{
return(MultiMapAsync <TFirst, TSecond, TThird, TFourth, TFifth, TSixth, TSeventh, TReturn>(cnn, command, map, splitOn));
}
/// <summary>
/// Execute a query asynchronously using .NET 4.5 Task.
/// </summary>
/// <remarks>Note: each row can be accessed via "dynamic", or by casting to an IDictionary<string,object></remarks>
public static async Task <IEnumerable <dynamic> > QueryAsync(this IDbConnection cnn, CommandDefinition command)
{
return(await QueryAsync <DapperRow>(cnn, typeof(DapperRow), command).ConfigureAwait(false));
}
private static async Task <int> ExecuteMultiImplAsync(IDbConnection cnn, CommandDefinition command, IEnumerable multiExec)
{
bool isFirst = true;
int total = 0;
bool wasClosed = cnn.State == ConnectionState.Closed;
try
{
if (wasClosed)
{
await((DbConnection)cnn).OpenAsync(command.CancellationToken).ConfigureAwait(false);
}
CacheInfo info = null;
string masterSql = null;
if ((command.Flags & CommandFlags.Pipelined) != 0)
{
const int MAX_PENDING = 100;
var pending = new Queue <AsyncExecState>(MAX_PENDING);
DbCommand cmd = null;
try
{
foreach (var obj in multiExec)
{
if (isFirst)
{
isFirst = false;
cmd = (DbCommand)command.SetupCommand(cnn, null);
masterSql = cmd.CommandText;
var identity = new Identity(command.CommandText, cmd.CommandType, cnn, null, obj.GetType(), null);
info = GetCacheInfo(identity, obj, command.AddToCache);
}
else if (pending.Count >= MAX_PENDING)
{
var recycled = pending.Dequeue();
total += await recycled.Task.ConfigureAwait(false);
cmd = recycled.Command;
cmd.CommandText = masterSql; // because we do magic replaces on "in" etc
cmd.Parameters.Clear(); // current code is Add-tastic
}
else
{
cmd = (DbCommand)command.SetupCommand(cnn, null);
}
info.ParamReader(cmd, obj);
var task = cmd.ExecuteNonQueryAsync(command.CancellationToken);
pending.Enqueue(new AsyncExecState(cmd, task));
cmd = null; // note the using in the finally: this avoids a double-dispose
}
while (pending.Count != 0)
{
var pair = pending.Dequeue();
using (pair.Command) { } // dispose commands
total += await pair.Task.ConfigureAwait(false);
}
} finally
{
// this only has interesting work to do if there are failures
using (cmd) { } // dispose commands
while (pending.Count != 0)
{ // dispose tasks even in failure
using (pending.Dequeue().Command) { } // dispose commands
}
}
}
else
{
using (var cmd = (DbCommand)command.SetupCommand(cnn, null))
{
foreach (var obj in multiExec)
{
if (isFirst)
{
masterSql = cmd.CommandText;
isFirst = false;
var identity = new Identity(command.CommandText, cmd.CommandType, cnn, null, obj.GetType(), null);
info = GetCacheInfo(identity, obj, command.AddToCache);
}
else
{
cmd.CommandText = masterSql; // because we do magic replaces on "in" etc
cmd.Parameters.Clear(); // current code is Add-tastic
}
info.ParamReader(cmd, obj);
total += await cmd.ExecuteNonQueryAsync(command.CancellationToken).ConfigureAwait(false);
}
}
}
command.OnCompleted();
}
finally
{
if (wasClosed)
{
cnn.Close();
}
}
return(total);
}
