/// <summary>
/// Generates an accessor for a property in the object.
/// </summary>
/// <param name="type">The type of object being read.</param>
/// <param name="mapping">The column mapping.</param>
/// <param name="columnInfo">The column information.</param>
/// <returns>An accessor function or null if there is no mapping.</returns>
private static Func <object, object> GenerateAccessor(Type type, FieldMapping mapping, ColumnInfo columnInfo)
{
if (mapping == null)
{
return(null);
}
ClassPropInfo propInfo = mapping.Member;
// create a new anonymous method that takes an object and returns the value
var dm = new DynamicMethod(string.Format(CultureInfo.InvariantCulture, "GetValue-{0}-{1}", type.FullName, Guid.NewGuid()), typeof(object), new[] { typeof(object) }, true);
var il = dm.GetILGenerator();
// convert the object reference to the desired type
il.Emit(OpCodes.Ldarg_0);
if (type.IsValueType)
{
// access the field/property of a value type
var valueHolder = il.DeclareLocal(type);
il.Emit(OpCodes.Unbox_Any, type);
il.Emit(OpCodes.Stloc, valueHolder);
il.Emit(OpCodes.Ldloca_S, valueHolder);
}
else
{
il.Emit(OpCodes.Isinst, type); // cast object -> type
}
// get the value from the object
var readyToSetLabel = il.DefineLabel();
ClassPropInfo.EmitGetValue(type, mapping.PathToMember, il, readyToSetLabel);
if (mapping.Member.MemberType.IsValueType)
{
il.Emit(OpCodes.Unbox_Any, mapping.Member.MemberType);
}
// if the type is nullable, handle nulls
Type sourceType = propInfo.MemberType;
Type targetType = columnInfo.ColumnType;
Type underlyingType = Nullable.GetUnderlyingType(sourceType);
if (underlyingType != null)
{
// check for not null
Label notNullLabel = il.DefineLabel();
var nullableHolder = il.DeclareLocal(propInfo.MemberType);
il.Emit(OpCodes.Stloc, nullableHolder);
il.Emit(OpCodes.Ldloca_S, nullableHolder);
il.Emit(OpCodes.Call, sourceType.GetProperty("HasValue").GetGetMethod());
il.Emit(OpCodes.Brtrue_S, notNullLabel);
// it's null, just return null
il.Emit(OpCodes.Ldnull);
il.Emit(OpCodes.Ret);
il.MarkLabel(notNullLabel);
// it's not null, so unbox to the underlyingtype
il.Emit(OpCodes.Ldloca, nullableHolder);
il.Emit(OpCodes.Call, sourceType.GetProperty("Value").GetGetMethod());
// at this point we have de-nulled value, so use those converters
sourceType = underlyingType;
}
// if the serializer isn't the default ToStringSerializer, and it can serialize the type properly, then use it
// otherwise we'll use coersion or conversion
var targetDbType = DbParameterGenerator.LookupDbType(targetType);
bool canSerialize = sourceType != typeof(string) &&
mapping.Serializer.GetType() != typeof(ToStringObjectSerializer) &&
mapping.Serializer.CanSerialize(sourceType, targetDbType);
if (sourceType != targetType && canSerialize)
{
if (sourceType.IsValueType)
{
il.Emit(OpCodes.Box, sourceType);
}
il.EmitLoadType(sourceType);
StaticFieldStorage.EmitLoad(il, mapping.Serializer);
il.Emit(OpCodes.Call, typeof(ObjectReader).GetMethod("SerializeObject", BindingFlags.NonPublic | BindingFlags.Static));
}
else
{
// attempt to convert the value
// either way, we are putting it in an object variable, so box it
if (TypeConverterGenerator.EmitConversionOrCoersion(il, sourceType, targetType))
{
il.Emit(OpCodes.Box, targetType);
}
else
{
il.Emit(OpCodes.Box, sourceType);
}
}
il.MarkLabel(readyToSetLabel);
il.Emit(OpCodes.Ret);
return((Func <object, object>)dm.CreateDelegate(typeof(Func <object, object>)));
}
private static void GenerateReturnsStructure(MethodInfo interfaceMethod, ILGenerator mIL)
{
// if we are returning a task, unwrap the task result
var returnType = interfaceMethod.ReturnType;
if (returnType.IsGenericType && returnType.GetGenericTypeDefinition() == typeof(Task <>))
{
returnType = returnType.GetGenericArguments()[0];
}
// if there are returns attributes specified, then build the structure for the coder
var returnsAttributes = interfaceMethod.GetCustomAttributes(true).OfType <RecordsetAttribute>().ToDictionary(r => r.Index);
if (returnType.IsSubclassOf(typeof(Results)) && !returnType.Name.StartsWith("Results`", StringComparison.OrdinalIgnoreCase))
{
// we have a return that is derived from results
mIL.Emit(OpCodes.Ldsfld, typeof(DerivedResultsReader <>).MakeGenericType(returnType).GetField("Default"));
}
else
{
bool isSingle = !returnType.IsSubclassOf(typeof(Results)) && !IsGenericListType(returnType);
// we are returning results<T...>, or IList<T...>
var returnTypeArgs = isSingle ? new Type[] { returnType } : returnType.GetGenericArguments();
Type currentType = null;
// go through all of the type arguments or recordsets
int returnIndex = 0;
for (int i = 0; i < Math.Max(returnTypeArgs.Length, returnsAttributes.Keys.MaxOrDefault(k => k + 1)); i++)
{
RecordsetAttribute r;
returnsAttributes.TryGetValue(i, out r);
var types = (r != null) ? r.Types : new Type[] { returnTypeArgs[i] };
// grab the records field for the appropriate OneToOne mapping
mIL.Emit(OpCodes.Ldsfld, Query.GetOneToOneType(types).GetField("Records", BindingFlags.Public | BindingFlags.Static));
// keep track of the type that we are returning
if (r == null || !r.IsChild)
{
returnIndex++;
}
if (i == 0)
{
// start the chain of calls
if (isSingle)
{
var recordReader = typeof(IRecordReader <>).MakeGenericType(returnType);
var readerType = typeof(SingleReader <>).MakeGenericType(returnType);
var constructor = readerType.GetConstructor(new Type[] { recordReader });
mIL.Emit(OpCodes.Newobj, constructor);
currentType = readerType;
}
else if (returnType.IsSubclassOf(typeof(Results)))
{
var method = typeof(Query).GetMethod("ReturnsResults", BindingFlags.Public | BindingFlags.Static).MakeGenericMethod(types[0]);
currentType = method.ReturnType;
mIL.Emit(OpCodes.Call, method);
}
else
{
// IList<T> or List<T>, etc...
var oneToOneBaseType = typeof(OneToOne <>).MakeGenericType(types[0]);
currentType = typeof(ListReader <>).MakeGenericType(types[0]);
Type readerType = currentType;
// if we're not returning an IList, then we need to insert the reader adapter class
if (returnType.GetGenericTypeDefinition() != typeof(IList <>))
{
readerType = typeof(ListReaderAdapter <,>).MakeGenericType(returnType, types[0]);
}
mIL.Emit(OpCodes.Newobj, readerType.GetConstructor(new Type[] { oneToOneBaseType }));
}
}
else if (r != null && r.IsChild)
{
// the parent is single and we haven't overridden the id field
var parentType = currentType.GetGenericArguments()[0];
var childType = types[0];
var list = ChildMapperHelper.GetListSetter(parentType, childType, r.Into);
var listMethod = typeof(ClassPropInfo).GetMethod("CreateSetMethod").MakeGenericMethod(parentType, typeof(List <>).MakeGenericType(childType)).Invoke(list, Parameters.EmptyArray);
MethodInfo method;
if (r.Id == null && TypeIsSingleReader(currentType))
{
// previous and recordReader are on the stack, add the id and list method
StaticFieldStorage.EmitLoad(mIL, listMethod, _moduleBuilder);
method = typeof(Query).GetMethods(BindingFlags.Public | BindingFlags.Static)
.Single(
mi => mi.Name == "ThenChildren" &&
mi.GetGenericArguments().Length == 2 &&
currentType.GetGenericTypeDefinition().Name == mi.GetParameters()[0].ParameterType.Name)
.MakeGenericMethod(
new Type[]
{
parentType, // TParent
childType, // TChild
});
}
else
{
var recordReaderType = typeof(RecordReader <>).MakeGenericType(childType);
var parentid = ChildMapperHelper.GetIDAccessor(parentType, r.Id);
var parentIdType = parentid.MemberType;
var parentIdMethod = parentid.GetType().GetMethod("CreateGetMethod").MakeGenericMethod(parentType, parentIdType).Invoke(parentid, Parameters.EmptyArray);
// if groupby is specified, then convert the RecordReader to an IChildRecordReader by groupby
if (r.GroupBy != null)
{
var childid = ChildMapperHelper.FindParentIDAccessor(childType, r.GroupBy, parentType);
if (childid == null)
{
throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture, "Cannot find GroupBy {0} on {1}", r.GroupBy, childType.FullName));
}
var getMethod = childid.GetType().GetMethod("CreateGetMethod").MakeGenericMethod(childType, parentIdType).Invoke(childid, Parameters.EmptyArray);
StaticFieldStorage.EmitLoad(mIL, getMethod, _moduleBuilder);
var groupByMethod = recordReaderType.GetMethod("GroupBy").MakeGenericMethod(parentIdType);
mIL.Emit(OpCodes.Call, groupByMethod);
recordReaderType = groupByMethod.ReturnType;
}
// previous and recordReader are on the stack, add the id and list methods
StaticFieldStorage.EmitLoad(mIL, parentIdMethod, _moduleBuilder);
StaticFieldStorage.EmitLoad(mIL, listMethod, _moduleBuilder);
method = typeof(Query).GetMethods(BindingFlags.Public | BindingFlags.Static)
.Single(
mi => mi.Name == "ThenChildren" &&
mi.GetGenericArguments().Length == 3 &&
currentType.GetGenericTypeDefinition().Name == mi.GetParameters()[0].ParameterType.Name &&
mi.GetParameters()[1].ParameterType.Name == recordReaderType.Name &&
mi.GetParameters().Any(p => String.Compare(p.Name, "id", StringComparison.OrdinalIgnoreCase) == 0))
.MakeGenericMethod(
new Type[]
{
parentType, // TParent
childType, // TChild
parentIdType // TId
});
}
mIL.Emit(OpCodes.Call, method);
currentType = method.ReturnType;
}
else
{
var method = typeof(Query).GetMethods(BindingFlags.Public | BindingFlags.Static)
.Single(mi => mi.Name == "Then" && mi.GetGenericArguments().Length == returnIndex && mi.GetParameters()[0].ParameterType.Name.StartsWith("IQueryReader", StringComparison.OrdinalIgnoreCase))
.MakeGenericMethod(returnTypeArgs.Take(returnIndex).ToArray());
mIL.Emit(OpCodes.Call, method);
currentType = method.ReturnType;
}
}
}
}
/// <summary>
/// Emits the IL to convert a value to a target type.
/// </summary>
/// <param name="il">The IL generator to output to.</param>
/// <param name="memberName">The name of the member being converted.</param>
/// <param name="sourceType">The source type.</param>
/// <param name="targetType">The target type.</param>
/// <param name="serializer">The serializer to use to deserialize the value.</param>
public static void EmitConvertValue(ILGenerator il, string memberName, Type sourceType, Type targetType, IDbObjectSerializer serializer)
{
// targetType - the target type we need to convert to
// underlyingTargetType - if the target type is nullable, we need to look at the underlying target type
// rawTargetType - if the underlying target type is enum, we need to look at the underlying target type for that
// sourceType - this is the type of the data in the data set
Type underlyingTargetType = Nullable.GetUnderlyingType(targetType) ?? targetType;
// some labels that we need
var finishLabel = il.DefineLabel();
Label isDbNullLabel = il.DefineLabel();
// if the value is DbNull, then we continue to the next item
il.Emit(OpCodes.Dup); // dup value, stack => [target][value][value]
il.Emit(OpCodes.Isinst, typeof(DBNull)); // isinst DBNull:value, stack => [target][value-as-object][DBNull or null]
il.Emit(OpCodes.Brtrue_S, isDbNullLabel); // br.true isDBNull, stack => [target][value-as-object]
// handle the special target types first
if (targetType == typeof(char))
{
// char
il.EmitCall(OpCodes.Call, _readChar, null);
}
else if (targetType == typeof(char?))
{
// char?
il.EmitCall(OpCodes.Call, _readNullableChar, null);
}
else if (targetType == TypeHelper.LinqBinaryType)
{
// unbox sql byte arrays to Linq.Binary
// before: stack => [target][object-value]
// after: stack => [target][byte-array-value]
il.Emit(OpCodes.Unbox_Any, typeof(byte[])); // stack is now [target][byte-array]
// before: stack => [target][byte-array-value]
// after: stack => [target][Linq.Binary-value]
il.Emit(OpCodes.Newobj, TypeHelper.LinqBinaryCtor);
}
else if (targetType == typeof(XmlDocument))
{
// special handler for XmlDocuments
// before: stack => [target][object-value]
il.Emit(OpCodes.Call, _readXmlDocument);
// after: stack => [target][xmlDocument]
}
else if (targetType == typeof(XDocument))
{
// special handler for XDocuments
// before: stack => [target][object-value]
il.Emit(OpCodes.Call, _readXDocument);
// after: stack => [target][xDocument]
}
else if (serializer != null && serializer.CanDeserialize(sourceType, targetType))
{
// we are getting a string from the database, but the target is not a string, and it's a reference type
// assume the column is a serialized data type and that we want to deserialize it
il.EmitLoadType(targetType);
StaticFieldStorage.EmitLoad(il, serializer);
il.Emit(OpCodes.Call, typeof(TypeConverterGenerator).GetMethod("DeserializeObject", BindingFlags.NonPublic | BindingFlags.Static));
il.Emit(OpCodes.Unbox_Any, targetType);
}
else if (underlyingTargetType.IsEnum && sourceType == typeof(string))
{
var localString = il.DeclareLocal(typeof(string));
// if we are converting a string to an enum, then parse it.
// see if the value from the database is a string. if so, we need to parse it. If not, we will just try to unbox it.
il.Emit(OpCodes.Isinst, typeof(string)); // is string, stack => [target][string]
il.Emit(OpCodes.Stloc, localString); // pop loc.2 (enum), stack => [target]
// call enum.parse (type, value, true)
il.EmitLoadType(underlyingTargetType);
il.Emit(OpCodes.Ldloc, localString); // push enum, stack => [target][enum-type][string]
il.Emit(OpCodes.Ldc_I4_1); // push true, stack => [target][enum-type][string][true]
il.EmitCall(OpCodes.Call, _enumParse, null); // call Enum.Parse, stack => [target][enum-as-object]
// Enum.Parse returns an object, which we need to unbox to the enum value
il.Emit(OpCodes.Unbox_Any, underlyingTargetType);
}
else if (EmitConstructorConversion(il, sourceType, targetType))
{
// target type can be constructed from source type
}
else
{
// this isn't a system value type, so unbox to the type the reader is giving us (this is a system type, hopefully)
// now we have an unboxed sourceType
il.Emit(OpCodes.Unbox_Any, sourceType);
if (sourceType != targetType)
{
// attempt to convert the value to the target type
if (!EmitConversionOrCoersion(il, sourceType, targetType))
{
if (sourceType != targetType)
{
throw new InvalidOperationException(String.Format(
CultureInfo.InvariantCulture,
"Field {0} cannot be converted from {1} to {2}. Create a conversion constructor or conversion operator.",
memberName,
sourceType.AssemblyQualifiedName,
targetType.AssemblyQualifiedName));
}
}
// if the target is nullable, then construct the nullable from the data
if (Nullable.GetUnderlyingType(targetType) != null)
{
il.Emit(OpCodes.Newobj, targetType.GetConstructor(new[] { underlyingTargetType }));
}
}
}
/////////////////////////////////////////////////////////////////////
// convert DBNull to default of the given type
il.Emit(OpCodes.Br_S, finishLabel);
il.MarkLabel(isDbNullLabel);
il.Emit(OpCodes.Pop);
TypeHelper.EmitDefaultValue(il, targetType);
il.MarkLabel(finishLabel);
}
private static Action <IDbCommand, object> CreateClassInputParameterGenerator(IDbCommand command, Type type)
{
var provider = InsightDbProvider.For(command);
var parameters = provider.DeriveParameters(command);
// special case if the parameters object is an IEnumerable or Array
// look for the parameter that is a Structured object and pass the array to the TVP
// note that string supports ienumerable, so exclude atomic types
var enumerable = type.GetInterfaces().FirstOrDefault(i => i.GetTypeInfo().IsGenericType&& i.GetGenericTypeDefinition() == typeof(IEnumerable <>));
if (enumerable != null && type != typeof(string) && parameters.OfType <IDataParameter>().Where(p => p.Direction.HasFlag(ParameterDirection.Input)).Count() == 1)
{
return((IDbCommand cmd, object o) =>
{
// don't use the provider above. The command may be unwrapped by the time we get back here
var tableParameter = InsightDbProvider.For(cmd).CloneParameter(cmd, parameters.OfType <IDataParameter>().Single(p => p.Direction.HasFlag(ParameterDirection.Input)));
cmd.Parameters.Add(tableParameter);
ListParameterHelper.ConvertListParameter(tableParameter, o, cmd);
});
}
// get the mapping of the properties for the type
var mappings = ColumnMapping.MapParameters(type, command, parameters);
// start creating a dynamic method
Type typeOwner = type.HasElementType ? type.GetElementType() : type;
var dm = new DynamicMethod(String.Format(CultureInfo.InvariantCulture, "CreateInputParameters-{0}", Guid.NewGuid()), null, new[] { typeof(IDbCommand), typeof(object) }, typeOwner, true);
var il = dm.GetILGenerator();
// copy the parameters into the command object
var parametersLocal = il.DeclareLocal(typeof(IDataParameter[]));
StaticFieldStorage.EmitLoad(il, provider);
il.Emit(OpCodes.Ldarg_0);
StaticFieldStorage.EmitLoad(il, parameters);
il.Emit(OpCodes.Call, typeof(InsightDbProvider).GetMethod("CopyParameters", BindingFlags.NonPublic | BindingFlags.Instance));
il.Emit(OpCodes.Stloc, parametersLocal);
// go through all of the mappings
for (int i = 0; i < mappings.Count; i++)
{
var mapping = mappings[i];
var dbParameter = parameters[i];
// if there is no mapping for the parameter
if (mapping == null)
{
// sql will silently eat table parameters that are not specified, and that can be difficult to debug
if (provider.IsTableValuedParameter(command, dbParameter))
{
throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture, "Table parameter {0} must be specified", dbParameter.ParameterName));
}
// unspecified input parameters get skipped
if (dbParameter.Direction == ParameterDirection.Input)
{
parameters[i] = null;
}
continue;
}
var memberType = mapping.Member.MemberType;
var serializer = mapping.Serializer;
// get the parameter
il.Emit(OpCodes.Ldloc, parametersLocal);
il.Emit(OpCodes.Ldc_I4, i);
il.Emit(OpCodes.Ldelem, typeof(IDataParameter));
// look up the best type to use for the parameter
DbType sqlType = LookupDbType(memberType, serializer, dbParameter.DbType);
// give the provider an opportunity to fix up the template parameter (e.g. set UDT type names)
provider.FixupParameter(command, dbParameter, sqlType, memberType, mapping.Member.SerializationMode);
// give a chance to override the best guess parameter
DbType overriddenSqlType = sqlType;
if (sqlType != DbTypeEnumerable)
{
overriddenSqlType = ColumnMapping.MapParameterDataType(memberType, command, dbParameter, sqlType);
}
///////////////////////////////////////////////////////////////
// We have a parameter, start handling all of the other types
///////////////////////////////////////////////////////////////
if (overriddenSqlType != sqlType)
{
sqlType = overriddenSqlType;
dbParameter.DbType = sqlType;
}
///////////////////////////////////////////////////////////////
// Get the value from the object onto the stack
///////////////////////////////////////////////////////////////
il.Emit(OpCodes.Ldarg_1);
if (type.GetTypeInfo().IsValueType)
{
il.Emit(OpCodes.Unbox_Any, type);
}
///////////////////////////////////////////////////////////////
// Special case support for enumerables. If the type is -1 (our workaround, then call the list parameter method)
///////////////////////////////////////////////////////////////
if (sqlType == DbTypeEnumerable)
{
// we have the parameter and the value as object, add the command
ClassPropInfo.EmitGetValue(type, mapping.PathToMember, il);
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Call, typeof(ListParameterHelper).GetMethod("ConvertListParameter", BindingFlags.Static | BindingFlags.NonPublic));
continue;
}
Label readyToSetLabel = il.DefineLabel();
ClassPropInfo.EmitGetValue(type, mapping.PathToMember, il, readyToSetLabel);
// special conversions for timespan to datetime
if ((sqlType == DbType.Time && dbParameter.DbType != DbType.Time) ||
(dbParameter.DbType == DbType.DateTime || dbParameter.DbType == DbType.DateTime2 || dbParameter.DbType == DbType.DateTimeOffset))
{
IlHelper.EmitLdInt32(il, (int)dbParameter.DbType);
il.Emit(OpCodes.Call, typeof(TypeConverterGenerator).GetMethod("ObjectToSqlDateTime"));
}
// if it's class type, boxed value type (in an object), or nullable, then we have to check for null
var nullableUnderlyingType = Nullable.GetUnderlyingType(memberType);
if (!memberType.GetTypeInfo().IsValueType || nullableUnderlyingType != null)
{
Label notNull = il.DefineLabel();
// check to see if it's not null
il.Emit(OpCodes.Dup);
il.Emit(OpCodes.Brtrue, notNull);
// it's null. replace the value with DbNull
il.Emit(OpCodes.Pop);
il.Emit(OpCodes.Ldsfld, _dbNullValue);
// value is set to null. ready to set the property.
il.Emit(OpCodes.Br, readyToSetLabel);
// we know the value is not null
il.MarkLabel(notNull);
}
// some providers (notably npgsql > 4.0) don't convert enums to ints, so we do it for them
if ((memberType != null && memberType.GetTypeInfo() != null && memberType.GetTypeInfo().IsEnum) ||
(nullableUnderlyingType != null && nullableUnderlyingType.GetTypeInfo() != null && nullableUnderlyingType.GetTypeInfo().IsEnum))
{
var enumType = nullableUnderlyingType ?? memberType;
// ClassPropInfo.EmitGetValue has the enum boxed, so unbox, cast, and re-box
switch (dbParameter.DbType)
{
case DbType.Int16:
il.Emit(OpCodes.Unbox_Any, enumType);
il.Emit(OpCodes.Conv_I2);
il.Emit(OpCodes.Box, typeof(Int16));
break;
case DbType.Int32:
il.Emit(OpCodes.Unbox_Any, enumType);
il.Emit(OpCodes.Conv_I4);
il.Emit(OpCodes.Box, typeof(Int32));
break;
case DbType.Int64:
il.Emit(OpCodes.Unbox_Any, enumType);
il.Emit(OpCodes.Conv_I8);
il.Emit(OpCodes.Box, typeof(Int64));
break;
}
}
///////////////////////////////////////////////////////////////
// if this is a linq binary, convert it to a byte array
///////////////////////////////////////////////////////////////
if (memberType == TypeHelper.LinqBinaryType)
{
il.Emit(OpCodes.Callvirt, TypeHelper.LinqBinaryToArray);
}
else if (memberType == typeof(XmlDocument))
{
// we are sending up an XmlDocument. ToString just returns the classname, so use the outerxml.
il.Emit(OpCodes.Callvirt, memberType.GetProperty("OuterXml").GetGetMethod());
}
else if (memberType == typeof(XDocument))
{
// we are sending up an XDocument. Use ToString.
il.Emit(OpCodes.Callvirt, memberType.GetMethod("ToString", new Type[] { }));
}
else if (serializer != null && serializer.CanSerialize(memberType, sqlType))
{
il.EmitLoadType(memberType);
StaticFieldStorage.EmitLoad(il, serializer);
il.Emit(OpCodes.Call, typeof(DbParameterGenerator).GetMethod("SerializeParameterValue", BindingFlags.NonPublic | BindingFlags.Static));
}
///////////////////////////////////////////////////////////////
// p.Value = value
///////////////////////////////////////////////////////////////
// push parameter is at top of method
// value is above
il.MarkLabel(readyToSetLabel);
if (memberType == typeof(string))
{
il.Emit(OpCodes.Call, typeof(DbParameterGenerator).GetMethod("SetParameterStringValue", BindingFlags.NonPublic | BindingFlags.Static));
}
else if ((memberType == typeof(Guid?) || (memberType == typeof(Guid))) && dbParameter.DbType != DbType.Guid && command.CommandType == CommandType.StoredProcedure)
{
il.Emit(OpCodes.Call, typeof(DbParameterGenerator).GetMethod("SetParameterGuidValue", BindingFlags.NonPublic | BindingFlags.Static));
}
else
{
il.Emit(OpCodes.Callvirt, _iDataParameterSetValue);
}
}
il.Emit(OpCodes.Ret);
return((Action <IDbCommand, object>)dm.CreateDelegate(typeof(Action <IDbCommand, object>)));
}
private ObjectReader(IDbCommand command, Type type, IDataReader reader)
{
var provider = InsightDbProvider.For(command);
// create a mapping, and only keep mappings that match our modified schema
var mappings = ColumnMapping.MapColumns(type, reader).ToList();
// copy the schema and fix it
SchemaTable = reader.GetSchemaTable().Copy();
FixupSchemaNumericScale();
FixupSchemaRemoveReadOnlyColumns(mappings);
IsAtomicType = TypeHelper.IsAtomicType(type);
if (!IsAtomicType)
{
int columnCount = SchemaTable.Rows.Count;
_accessors = new Func <object, object> [columnCount];
_memberTypes = new Type[columnCount];
for (int i = 0; i < columnCount; i++)
{
var mapping = mappings[i];
if (mapping == null)
{
continue;
}
ClassPropInfo propInfo = mapping.Member;
// create a new anonymous method that takes an object and returns the value
var dm = new DynamicMethod(string.Format(CultureInfo.InvariantCulture, "GetValue-{0}-{1}", type.FullName, Guid.NewGuid()), typeof(object), new[] { typeof(object) }, true);
var il = dm.GetILGenerator();
// convert the object reference to the desired type
il.Emit(OpCodes.Ldarg_0);
if (type.IsValueType)
{
// access the field/property of a value type
var valueHolder = il.DeclareLocal(type);
il.Emit(OpCodes.Unbox_Any, type);
il.Emit(OpCodes.Stloc, valueHolder);
il.Emit(OpCodes.Ldloca_S, valueHolder);
}
else
{
il.Emit(OpCodes.Isinst, type); // cast object -> type
}
// get the value from the object
var readyToSetLabel = il.DefineLabel();
ClassPropInfo.EmitGetValue(type, mapping.PathToMember, il, readyToSetLabel);
if (mapping.Member.MemberType.IsValueType)
{
il.Emit(OpCodes.Unbox_Any, mapping.Member.MemberType);
}
// if the type is nullable, handle nulls
Type sourceType = propInfo.MemberType;
Type targetType = (Type)SchemaTable.Rows[i]["DataType"];
Type underlyingType = Nullable.GetUnderlyingType(sourceType);
if (underlyingType != null)
{
// check for not null
Label notNullLabel = il.DefineLabel();
var nullableHolder = il.DeclareLocal(propInfo.MemberType);
il.Emit(OpCodes.Stloc, nullableHolder);
il.Emit(OpCodes.Ldloca_S, nullableHolder);
il.Emit(OpCodes.Call, sourceType.GetProperty("HasValue").GetGetMethod());
il.Emit(OpCodes.Brtrue_S, notNullLabel);
// it's null, just return null
il.Emit(OpCodes.Ldnull);
il.Emit(OpCodes.Ret);
il.MarkLabel(notNullLabel);
// it's not null, so unbox to the underlyingtype
il.Emit(OpCodes.Ldloca, nullableHolder);
il.Emit(OpCodes.Call, sourceType.GetProperty("Value").GetGetMethod());
// at this point we have de-nulled value, so use those converters
sourceType = underlyingType;
}
if (sourceType != targetType && !sourceType.IsValueType && sourceType != typeof(string))
{
il.EmitLoadType(sourceType);
StaticFieldStorage.EmitLoad(il, mapping.Serializer);
il.Emit(OpCodes.Call, typeof(ObjectReader).GetMethod("SerializeObject", BindingFlags.NonPublic | BindingFlags.Static));
}
else
{
// attempt to convert the value
// either way, we are putting it in an object variable, so box it
if (TypeConverterGenerator.EmitConversionOrCoersion(il, sourceType, targetType))
{
il.Emit(OpCodes.Box, targetType);
}
else
{
il.Emit(OpCodes.Box, sourceType);
}
}
il.MarkLabel(readyToSetLabel);
il.Emit(OpCodes.Ret);
_memberTypes[i] = propInfo.MemberType;
_accessors[i] = (Func <object, object>)dm.CreateDelegate(typeof(Func <object, object>));
}
}
else
{
// we are working off a single-column atomic type
_memberTypes = new Type[1] {
type
};
_accessors = new Func <object, object>[] { o => o };
}
}