private static List <T> SelectInternal <T>(string connectstring, string query, SqlParameter[] parameters = null, bool isStoredProdedure = false)
{
if (string.IsNullOrEmpty(query))
{
throw new ArgumentNullException("query", "query cannot be null or empty.");
}
if (log.IsDebugEnabled)
{
log.DebugFormat("Query Begin:{0}", query);
}
SqlConnection connection = new SqlConnection(connectstring);
SqlCommand cmd = new SqlCommand(query, connection);
cmd.CommandTimeout = commandTimeout;
cmd.CommandType = isStoredProdedure ? CommandType.StoredProcedure : CommandType.Text;
if (parameters != null && parameters.Length > 0)
{
cmd.Parameters.AddRange(parameters);
LogSqlParameters(parameters);
}
List <T> list = new List <T>();
DynamicBuilder <T> _builder = null;
connection.Open();
using (SqlDataReader sqlDataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection))
{
Type t = typeof(T);
while (sqlDataReader.Read())
{
if (t.IsValueType || t == typeof(string) || t == typeof(byte[]))
{
list.Add((T)Convert.ChangeType(sqlDataReader[0], typeof(T)));
}
else
{
if (_builder == null)
{
_builder = DynamicBuilderCache.ResolveDynamicBuilder <T>(sqlDataReader);
}
T entity = _builder.BuildEntity(sqlDataReader);
if (entity != null)
{
list.Add(entity);
}
}
}
cmd.Cancel();
}
if (log.IsDebugEnabled)
{
log.DebugFormat("Query End:{0}", query);
}
return(list);
}
public static DynamicBuilder <T> ResolveDynamicBuilder <T>(SqlDataReader sqlDataReader)
{
string cacheKey = string.Empty;
cacheKey = ResolveDynamicBuilderCacheKeyInternal(sqlDataReader, typeof(T));
DynamicBuilder <T> builder = null;
if (dynamicBuilderCache.ContainsKey(cacheKey))
{
builder = dynamicBuilderCache[cacheKey] as DynamicBuilder <T>;
}
if (builder == null)
{
builder = DynamicBuilder <T> .CreateEntityBuilder(sqlDataReader);
dynamicBuilderCache[cacheKey] = builder;
}
return(builder);
}
public static DynamicBuilder <T> CreateEntityBuilder(IDataRecord dataRecord)
{
Type t = typeof(T);
DynamicBuilder <T> dynamicBuilder = new DynamicBuilder <T>();
try
{
DynamicMethod method = new DynamicMethod("DynamicModelCreate", typeof(T), new Type[] { typeof(IDataRecord) }, typeof(T), true);
ILGenerator generator = method.GetILGenerator();
LocalBuilder result = generator.DeclareLocal(typeof(T));
generator.Emit(OpCodes.Newobj, t.GetConstructor(Type.EmptyTypes));
generator.Emit(OpCodes.Stloc, result);
var properties = t.GetProperties();
for (int i = 0; i < dataRecord.FieldCount; i++)
{
var temp = properties.Where(n => n.Name.ToLower() == dataRecord.GetName(i).ToLower()).ToList();
PropertyInfo propertyInfo = null;
if (temp.Count() >= 1)
{
propertyInfo = temp[0];
}
LocalBuilder il_P = generator.DeclareLocal(typeof(PropertyInfo));
Label endIfLabel = generator.DefineLabel();
if (propertyInfo != null && propertyInfo.GetSetMethod() != null)
{
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldc_I4, i);
generator.Emit(OpCodes.Callvirt, isDBNullMethod);
generator.Emit(OpCodes.Brtrue, endIfLabel);
generator.Emit(OpCodes.Ldloc, result);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldc_I4, i);
generator.Emit(OpCodes.Callvirt, getValueMethod);
switch (propertyInfo.PropertyType.Name)
{
case "Int16":
generator.Emit(OpCodes.Call, typeof(Convert).GetMethod("ToInt16", new Type[] { typeof(object) }));
break;
case "Int32":
generator.Emit(OpCodes.Call, typeof(Convert).GetMethod("ToInt32", new Type[] { typeof(object) }));
break;
case "Int64":
generator.Emit(OpCodes.Call, typeof(Convert).GetMethod("ToInt64", new Type[] { typeof(object) }));
break;
case "Boolean":
generator.Emit(OpCodes.Call, typeof(Convert).GetMethod("ToBoolean", new Type[] { typeof(object) }));
break;
case "String":
generator.Emit(OpCodes.Call, typeof(Convert).GetMethod("ToString", new Type[] { typeof(object) }));
break;
case "DateTime":
generator.Emit(OpCodes.Call, typeof(Convert).GetMethod("ToDateTime", new Type[] { typeof(object) }));
break;
case "Decimal":
generator.Emit(OpCodes.Call, typeof(Convert).GetMethod("ToDecimal", new Type[] { typeof(object) }));
break;
case "Byte":
generator.Emit(OpCodes.Call, typeof(Convert).GetMethod("ToByte", new Type[] { typeof(object) }));
break;
case "Nullable`1":
{
if (propertyInfo.PropertyType == typeof(DateTime?))
{
generator.Emit(OpCodes.Call, CreateConverterMethodInfo("ToDateTimeNull"));
}
else if (propertyInfo.PropertyType == typeof(Int32?))
{
generator.Emit(OpCodes.Call, CreateConverterMethodInfo("ToInt32Null"));
}
else if (propertyInfo.PropertyType == typeof(Boolean?))
{
generator.Emit(OpCodes.Call, CreateConverterMethodInfo("ToBooleanNull"));
}
break;
}
default:
generator.Emit(OpCodes.Unbox_Any, dataRecord.GetFieldType(i));
break;
}
generator.Emit(OpCodes.Callvirt, propertyInfo.GetSetMethod());
generator.MarkLabel(endIfLabel);
}
}
generator.Emit(OpCodes.Ldloc, result);
generator.Emit(OpCodes.Ret);
dynamicBuilder.handler = (Load)method.CreateDelegate(typeof(Load));
}
catch (Exception ex)
{
throw ex;
}
return(dynamicBuilder);
}
