/// <summary>
/// 异步的，执行查询文本并将结果并返回动态序列。
/// </summary>
/// <param name="queryCommand">查询命令。</param>
/// <param name="segment">数据分段对象。</param>
/// <param name="parameters">查询参数集合。</param>
/// <param name="cancellationToken">取消操作的通知。</param>
/// <returns>一个动态对象的枚举器。</returns>
public virtual async Task <IEnumerable <dynamic> > ExecuteEnumerableAsync(IQueryCommand queryCommand, IDataSegment segment = null, ParameterCollection parameters = null, CancellationToken cancellationToken = default)
{
Guard.ArgumentNull(queryCommand, nameof(queryCommand));
cancellationToken.ThrowIfCancellationRequested();
var result = new List <dynamic>();
using var reader = (InternalDataReader) await ExecuteReaderAsync(queryCommand, segment, parameters, CommandBehavior.Default, cancellationToken);
var wrapper = Provider.GetService <IRecordWrapper>();
TypeDescriptorUtility.AddDefaultDynamicProvider();
while (await reader.ReadAsync(cancellationToken))
{
var expando = new ExpandoObject();
var dictionary = (IDictionary <string, object>)expando;
for (int i = 0, n = reader.FieldCount; i < n; i++)
{
var name = wrapper.GetFieldName(reader, i);
if (name.Equals("ROW_NUM"))
{
continue;
}
dictionary.Add(wrapper.GetFieldName(reader, i), RecordWrapHelper.GetValue(wrapper, reader, i));
}
result.Add(expando);
}
return(result);
}
/// <summary>
/// 根据自定义的SQL语句查询返回一组动态对象。
/// </summary>
/// <param name="queryCommand">查询命令。</param>
/// <param name="segment">数据分段对象。</param>
/// <param name="parameters">查询参数集合。</param>
/// <returns>一个动态对象的枚举器。</returns>
public virtual IEnumerable <object> ExecuteEnumerable(IQueryCommand queryCommand, IDataSegment segment = null, ParameterCollection parameters = null)
{
Guard.ArgumentNull(queryCommand, "queryCommand");
using (var reader = ExecuteReader(queryCommand, segment, parameters))
{
var wrapper = Provider.GetService <IRecordWrapper>();
#if !N35 && DYNAMIC
TypeDescriptorUtility.AddDefaultDynamicProvider();
while (reader.Read())
{
var expando = new ExpandoObject();
var dictionary = (IDictionary <string, object>)expando;
for (var i = 0; i < reader.FieldCount; i++)
{
dictionary.Add(wrapper.GetFieldName(reader, i), RecordWrapHelper.GetValue(wrapper, reader, i));
}
yield return(expando);
}
#else
var builder = new DataReaderTypeBuilder(reader);
var elementType = builder.CreateType();
while (reader.Read())
{
yield return(elementType.New(reader, wrapper));
}
#endif
}
}
/// <summary>
/// 根据自定义的SQL语句查询返回一组动态对象。
/// </summary>
/// <param name="queryCommand">查询命令。</param>
/// <param name="segment">数据分段对象。</param>
/// <param name="parameters">查询参数集合。</param>
/// <returns>一个动态对象的枚举器。</returns>
public virtual IEnumerable <dynamic> ExecuteEnumerable(IQueryCommand queryCommand, IDataSegment segment = null, ParameterCollection parameters = null)
{
Guard.ArgumentNull(queryCommand, nameof(queryCommand));
using var reader = ExecuteReader(queryCommand, segment, parameters, CommandBehavior.Default);
var wrapper = Provider.GetService <IRecordWrapper>();
TypeDescriptorUtility.AddDefaultDynamicProvider();
while (reader.Read())
{
var expando = new ExpandoObject();
var dictionary = (IDictionary <string, object>)expando;
for (int i = 0, n = reader.FieldCount; i < n; i++)
{
var name = wrapper.GetFieldName(reader, i);
if (name.Equals("ROW_NUM"))
{
continue;
}
dictionary.Add(wrapper.GetFieldName(reader, i), RecordWrapHelper.GetValue(wrapper, reader, i));
}
yield return(expando);
}
}
/// <summary>
/// 异步的，执行查询文本并将结果并返回动态序列。
/// </summary>
/// <param name="queryCommand">查询命令。</param>
/// <param name="segment">数据分段对象。</param>
/// <param name="parameters">查询参数集合。</param>
/// <param name="cancellationToken">取消操作的通知。</param>
/// <returns>一个动态对象的枚举器。</returns>
public virtual async IAsyncEnumerable <dynamic> ExecuteEnumerableAsync(IQueryCommand queryCommand, IDataSegment segment = null, ParameterCollection parameters = null, CancellationToken cancellationToken = default)
{
Guard.ArgumentNull(queryCommand, nameof(queryCommand));
using (var reader = (DbDataReader)(await ExecuteReaderAsync(queryCommand, segment, parameters, cancellationToken)))
{
var wrapper = Provider.GetService <IRecordWrapper>();
TypeDescriptorUtility.AddDefaultDynamicProvider();
while (await reader.ReadAsync(cancellationToken))
{
var expando = new ExpandoObject();
var dictionary = (IDictionary <string, object>)expando;
for (var i = 0; i < reader.FieldCount; i++)
{
var name = wrapper.GetFieldName(reader, i);
if (name.Equals("ROW_NUM"))
{
continue;
}
dictionary.Add(wrapper.GetFieldName(reader, i), RecordWrapHelper.GetValue(wrapper, reader, i));
}
yield return(expando);
}
}
}
private static Type InternalCreateType(IDataReader reader, IEnumerable <Type> implInterfaceTypes)
{
var guid = Guid.NewGuid().ToString("N");
var typeBuilder = new DynamicAssemblyBuilder("_Dynamic_" + guid).DefineType("$<>" + guid);
foreach (var type in implInterfaceTypes)
{
typeBuilder.ImplementInterface(type);
}
var length = reader.FieldCount;
var fields = new DynamicFieldBuilder[length];
for (var i = 0; i < length; i++)
{
var name = GetFieldName(reader.GetName(i));
var type = reader.GetFieldType(i);
var fieldBuilder = typeBuilder.DefineField("<>__" + name, type);
typeBuilder.DefineProperty(name, type).DefineGetSetMethods(fieldBuilder);
fields[i] = fieldBuilder;
}
var constructorBuilder = typeBuilder.DefineConstructor(new[] { typeof(IDataReader), typeof(IRecordWrapper) }, ilCoding: bc =>
bc.Emitter
.For(0, length, (e, i) =>
e.ldarg_0
.ldarg_2
.ldarg_1
.ldc_i4(i)
.callvirt(RecordWrapHelper.GetGetValueMethod(reader.GetFieldType(i)))
.stfld(fields[i].FieldBuilder))
.ret());
constructorBuilder.DefineParameter("reader");
constructorBuilder.DefineParameter("wrapper");
return(typeBuilder.CreateType());
}
