// 构造由一对多关系产生的嵌套查询
static DbQueryableInfo_Select <TElement> TryBuilOuter <TElement>(DbQueryableInfo_Select <TElement> sQuery)
{
if (sQuery == null || sQuery.Select == null)
{
return(sQuery);
}
Expression select = sQuery.Select.Expressions[0];
List <DbExpression> include = sQuery.Include;
Type type = sQuery.FromType;
// 解析导航属性 如果有 一对多 的导航属性，那么查询的结果集的主记录将会有重复记录，这时就需要使用嵌套语义，先查主记录，再关联导航记录
bool checkListNavgation = false;
Expression expression = select;
LambdaExpression lambdaExpression = expression as LambdaExpression;
if (lambdaExpression != null)
{
expression = lambdaExpression.Body;
}
MemberInitExpression initExpression = expression as MemberInitExpression;
NewExpression newExpression = expression as NewExpression;
foreach (DbExpression d in include)
{
Expression exp = d.Expressions[0];
if (exp.NodeType == ExpressionType.Lambda)
{
exp = (exp as LambdaExpression).Body;
}
else if (exp.NodeType == ExpressionType.Call)
{
exp = (exp as MethodCallExpression).Object;
}
// Include 如果包含List<>泛型导航，则可以判定整个查询包含一对多的导航
//if (exp.Type.IsGenericType && exp.Type.GetGenericTypeDefinition() == typeof(List<>)) checkListNavgation = true;
if (TypeUtils.IsCollectionType(exp.Type))
{
checkListNavgation = true;
}
if (checkListNavgation)
{
break;
}
}
if (!checkListNavgation)
{
checkListNavgation = initExpression != null && CheckListNavigation <TElement>(initExpression);
}
if (checkListNavgation)
{
newExpression = initExpression != null ? initExpression.NewExpression : newExpression;
List <MemberBinding> bindings = new List <MemberBinding>();
if (initExpression != null)
{
bindings = initExpression.Bindings.ToList(x => x, x => TypeUtils.IsPrimitiveType((x.Member as System.Reflection.PropertyInfo).PropertyType));
}
if (newExpression != null || bindings.Count() > 0)
{
// 简化内层选择器，只选择最小字段，不选择导航字段，导航字段在外层加进去
initExpression = Expression.MemberInit(newExpression, bindings);
lambdaExpression = Expression.Lambda(initExpression, lambdaExpression.Parameters);
sQuery.Select = new DbExpression(DbExpressionType.Select, lambdaExpression);
}
sQuery.GenByListNavigation = true;
sQuery.Include = new List <DbExpression>();
var outQuery = new DbQueryableInfo_Select <TElement>();
outQuery.FromType = type;
outQuery.SubQueryInfo = sQuery;
outQuery.Join = new List <DbExpression>();
outQuery.OrderBy = new List <DbExpression>();
outQuery.Include = include;
outQuery.HaveListNavigation = true;
outQuery.Select = new DbExpression(DbExpressionType.Select, select);
if (sQuery.GroupBy != null)
{
// 查看外层是否需要重新构造选择器。如果有分组并且有聚合函数，则需要重新构造选择器。否则外层解析不了聚合函数
// demo=> line 640
bool newSelector = bindings.Any(x => ((MemberAssignment)x).Expression.NodeType == ExpressionType.Call) ||
newExpression.Arguments.Any(x => x.NodeType == ExpressionType.Call);
if (newSelector)
{
// 1对多导航嵌套查询外层的的第一个表别名固定t0，参数名可随意
ParameterExpression p = Expression.Parameter(newExpression.Type, "__g");
bindings = bindings.ToList(x => (MemberBinding)Expression.Bind(x.Member, Expression.MakeMemberAccess(p, x.Member)));
List <Expression> arguments = null;
if (newExpression.Members != null)
{
arguments = new List <Expression>(newExpression.Arguments.Count);
for (int i = 0; i < newExpression.Arguments.Count; i++)
{
var member = newExpression.Members[i];
var arg = Expression.MakeMemberAccess(p, member);
arguments.Add(arg);
}
}
newExpression = Expression.New(newExpression.Constructor, arguments, newExpression.Members);
initExpression = Expression.MemberInit(newExpression, bindings);
lambdaExpression = Expression.Lambda(initExpression, lambdaExpression.Parameters);
outQuery.Select = new DbExpression(DbExpressionType.Select, lambdaExpression);
}
}
sQuery = outQuery;
}
else if (sQuery.Union.Count > 0 && (sQuery.Take > 0 || sQuery.Skip > 0))
{
var outQuery = new DbQueryableInfo_Select <TElement>();
outQuery.FromType = type;
outQuery.Select = new DbExpression(DbExpressionType.Select, select);
outQuery.SubQueryInfo = sQuery;
outQuery.Skip = sQuery.Skip;
outQuery.Take = sQuery.Take;
outQuery.Join = new List <DbExpression>();
outQuery.OrderBy = new List <DbExpression>();
outQuery.OrderBy.AddRange(sQuery.OrderBy);
sQuery.OrderBy = new List <DbExpression>();
sQuery.Skip = 0;
sQuery.Take = 0;
sQuery = outQuery;
}
return(sQuery);
}
/// <summary>
/// 获取当前类型的所有成员
/// </summary>
protected virtual IEnumerable <MemberInfo> GetTypeMembers(Type type, bool @private)
{
return(TypeUtils.GetMembers(type, @private));
}
/// <summary>
/// 访问字段或者属性表达式
/// </summary>
/// <param name="node">字段或者成员表达式</param>
/// <returns></returns>
protected override Expression VisitMember(MemberExpression node)
{
// 1.<>h__TransparentIdentifier3.b.Client.ClientName
// 2.<>h__TransparentIdentifier3.b.Client.ClientName.Length
// 3.<>h__TransparentIdentifier3.b.Client.Address.AddressName
// 4.<>h__TransparentIdentifier3.b.ClientName
// <>h__TransparentIdentifier2.<>h__TransparentIdentifier3.b.ClientName
// <>h__TransparentIdentifier2.<>h__TransparentIdentifier3.b.Client.ClientName
// <>h__TransparentIdentifier2.<>h__TransparentIdentifier3.b.Client.Address.AddressName
// 5.b.ClientName
if (node == null)
{
return(node);
}
// => a.ActiveDate == DateTime.Now => a.State == (byte)state
if (node.CanEvaluate())
{
return(this.VisitConstant(node.Evaluate()));
}
// => DateTime.Now
if (node.Type == typeof(DateTime) && node.Expression == null)
{
return(_methodVisitor.Visit(node, MethodCall.MemberMember));
}
// => a.Nullable.Value
bool isNullable = node.Expression.Type.IsGenericType && node.Member.Name == "Value" && node.Expression.Type.GetGenericTypeDefinition() == typeof(Nullable <>);
if (isNullable)
{
this.Visit(node.Expression);
return(node);
}
// 记录访问成员栈
_visitedStack.Add(node);
// => a.Name.Length
if (TypeUtils.IsPrimitiveType(node.Expression.Type))
{
return(_methodVisitor.Visit(node, MethodCall.MemberMember));
}
// => <>h__3.b.ClientName
if (!node.Expression.Visitable())
{
return(_builder.AppendMember(node, _aliases));
}
// => a.Accounts[0].Markets[0].MarketId
// => b.Client.Address.AddressName
Expression objExpression = node.Expression;
bool isMethodCall = objExpression != null && objExpression.NodeType == ExpressionType.Call;
if (isMethodCall)
{
MethodCallExpression methodExpression = objExpression as MethodCallExpression;
bool isIndex = methodExpression.IsCollectionIndex();
if (isIndex)
{
objExpression = methodExpression.Object;
}
}
// => b.Client.Address.AddressName
this.VisitNavMember(objExpression, node.Member.Name);
return(node);
}
// => new App() {Id = p.Id}}
protected override Expression VisitMemberInit(MemberInitExpression node)
{
// 如果有一对多的导航属性会产生嵌套的SQL，这时需要强制主表选择的列里面必须包含导航外键
// TODO #对 Bindings 进行排序，保证导航属性的赋值一定要最后面#
// 未实现，在书写表达式时人工保证 ##
if (node.NewExpression != null)
{
this.VisitNewImpl(node.NewExpression);
}
if (_navChainHopper.Count == 0)
{
_navChainHopper.Add(node.Type.Name);
}
for (int i = 0; i < node.Bindings.Count; i++)
{
MemberAssignment binding = node.Bindings[i] as MemberAssignment;
if (binding == null)
{
throw new XFrameworkException("Only 'MemberAssignment' binding supported.");
}
Type propertyType = (node.Bindings[i].Member as System.Reflection.PropertyInfo).PropertyType;
bool isNavigation = !TypeUtils.IsPrimitiveType(propertyType);
#region 一般属性
// 非导航属性
if (!isNavigation)
{
if (binding.Expression.CanEvaluate())
{
_builder.Append(binding.Expression.Evaluate().Value, binding.Member, node.Type);
}
else
{
this.VisitWithoutRemark(x => this.VisitMemberBinding(binding));
}
// 选择字段
this.AddPickColumn(binding.Member.Name);
}
#endregion 一般属性
#region 导航属性
else
{
// 非显式指定的导航属性需要有 ForeignKeyAttribute
if (binding.Expression.NodeType == ExpressionType.MemberAccess && binding.Expression.Acceptable())
{
var typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(binding.Member.DeclaringType);
var attribute = typeRuntime.GetInvokerAttribute <ForeignKeyAttribute>(binding.Member.Name);
if (attribute == null)
{
throw new XFrameworkException("Complex property {{{0}}} must mark 'ForeignKeyAttribute' ", binding.Member.Name);
}
}
// 生成导航属性描述集合，以类名.属性名做为键值
int n = _navChainHopper.Count;
string keyName = _navChainHopper.Count > 0 ? _navChainHopper[_navChainHopper.Count - 1] : string.Empty;
keyName = !string.IsNullOrEmpty(keyName) ? keyName + "." + binding.Member.Name : binding.Member.Name;
var nav = new Navigation(keyName, binding.Member);
if (!_navigations.Contains(keyName))
{
// fix issue# spliton 列占一个位
nav.StartIndex = _pickColumns.Count;
nav.FieldCount = GetFieldCount(binding.Expression) + (binding.Expression.NodeType == ExpressionType.MemberAccess && binding.Expression.Acceptable() ? 1 : 0);
_navigations.Add(keyName, nav);
_navChainHopper.Add(keyName);
}
// 1.不显式指定导航属性，例：a.Client.ClientList
// 2.表达式里显式指定导航属性，例：b
if (binding.Expression.NodeType == ExpressionType.MemberAccess)
{
this.VisitNavigation(binding.Expression as MemberExpression, binding.Expression.Acceptable());
}
else if (binding.Expression.NodeType == ExpressionType.New)
{
this.VisitNewImpl(binding.Expression as NewExpression);
}
else if (binding.Expression.NodeType == ExpressionType.MemberInit)
{
this.VisitMemberInit(binding.Expression as MemberInitExpression);
}
// 恢复访问链
// 在访问导航属性时可能是 Client.CloudServer，这时要恢复为 Client，以保证能访问 Client 的下一个导航属性
if (_navChainHopper.Count != n)
{
_navChainHopper.RemoveAt(_navChainHopper.Count - 1);
}
}
#endregion 导航属性
}
return(node);
}
/// <summary>
/// 初始化 <see cref="TypeRuntimeInfo"/> 类的新实例
/// </summary>
/// <param name="type">类型声明</param>
/// <param name="includePrivates">包含私有成员</param>
internal TypeRuntimeInfo(Type type, bool includePrivates)
{
_type = type;
_isAnonymousType = TypeUtils.IsAnonymousType(_type);
_includePrivates = includePrivates;
}
/// <summary>
/// 生成 value 对应的 SQL 片断
/// </summary>
/// <param name="value">SQL值</param>
/// <param name="token">解析上下文</param>
/// <param name="m">value 对应的成员</param>
/// <returns></returns>
public string GetSqlValue(object value, ResolveToken token, MemberVisitedStack.VisitedMember m)
{
ColumnAttribute column = m != null?TypeUtils.GetColumnAttribute(m.Member, m.ReflectedType) : null;
return(this.GetSqlValue(value, token, column));
}
/// <summary>
/// 生成 value 对应的 SQL 片断
/// </summary>
/// <param name="value">SQL值</param>
/// <param name="token">解析SQL命令时的参数上下文</param>
/// <param name="dbType">数据类型</param>
/// <param name="size">长度</param>
/// <param name="precision">精度</param>
/// <param name="scale">小数位</param>
/// <param name="direction">查询参数类型</param>
/// <returns></returns>
public string GetSqlValue(object value, ResolveToken token,
object dbType, int?size = null, int?precision = null, int?scale = null, ParameterDirection?direction = null)
{
// https://docs.microsoft.com/zh-cn/sql/t-sql/data-types/datetime2-transact-sql?view=sql-server-2017
// 1.Date 3个字节,DateTime 8个字节 DateTime2 <=4 6个字节 其它8个字节，外加1个字节存储精度
// 2.如果转换时没有指定数据类型的长度，则SQServer自动提供长度为30
// 3.隐式转换优先级 https://docs.microsoft.com/zh-cn/sql/t-sql/data-types/data-type-precedence-transact-sql?view=sql-server-2017
// 4.参数化查询只需要重写 CreateParameter
if (value == null)
{
return("NULL");
}
else if (token != null && token.Parameters != null)
{
// 参数化 ##########
if (!(value is string) && !(value is byte[]) && (value is IEnumerable))
{
return(this.GetSqlValue(value as IEnumerable, token, dbType, size, precision, scale));
}
else
{
return(this.AddParameter(value, token, dbType, size, precision, scale, direction).ParameterName);
}
}
else
{
// 非参数化 ##########
Type type = value.GetType();
// 枚举类型
if (type.IsEnum)
{
return(this.GetSqlValueByEnum(value));
}
// Guid 类型
else if (value is Guid)
{
return(this.GetSqlValueByGuid(value));
}
// 数据类型
else if (TypeUtils.IsNumberType(type))
{
return(this.GetSqlValueByNumber(value));
}
// byte[] 类型
else if (value is byte[])
{
return(this.GetSqlValueByBytes(value));
}
// 布尔类型
else if (value is bool)
{
return(this.GetSqlValueByBoolean(value, dbType));
}
// 字符类型
else if (value is char || value is string)
{
return(this.GetSqlValueByString(value, dbType, size));
}
// 时间类型
else if (value is TimeSpan)
{
return(this.GetSqlValueByTime(value, dbType, scale));
}
// 日期类型
else if (value is DateTime)
{
return(this.GetSqlValueByDateTime(value, dbType, scale));
}
// 日期类型（带时区）
else if (value is DateTimeOffset)
{
return(this.GetSqlValueByDateTimeOffset(value, dbType, scale));
}
// 集合类型
else if (value is IEnumerable)
{
return(this.GetSqlValue(value as IEnumerable, token, dbType, size, precision, scale));
}
else
{
throw new NotSupportedException(string.Format("type {0} not supported serialize to string", type.FullName));
}
}
}
// 构造由一对多关系产生的嵌套查询
static DbQueryableInfo_Select <TElement> ParseOutQuery <TElement>(DbQueryableInfo_Select <TElement> dbQuery)
{
// @havePaging 是否有分页信息
if (dbQuery == null || dbQuery.Select == null)
{
return(dbQuery);
}
Expression select = dbQuery.Select.Expressions[0];
List <DbExpression> includes = dbQuery.Includes;
Type type = dbQuery.FromEntityType;
// 解析导航属性 如果有 1:n 的导航属性，那么查询的结果集的主记录将会有重复记录
// 这时就需要使用嵌套语义，先查主记录，再关联导航记录
Expression myExpression = select;
var lambdaExpression = myExpression as LambdaExpression;
if (lambdaExpression != null)
{
myExpression = lambdaExpression.Body;
}
var initExpression = myExpression as MemberInitExpression;
var newExpression = myExpression as NewExpression;
bool hasMany = DbQueryParser.IsHasMany(includes);
if (!hasMany)
{
hasMany = initExpression != null && IsHasMany <TElement>(initExpression);
}
#region 嵌套语义
if (hasMany)
{
newExpression = initExpression != null ? initExpression.NewExpression : newExpression;
List <MemberBinding> bindings = new List <MemberBinding>();
if (initExpression != null)
{
bindings = initExpression.Bindings.ToList(x => x, x => TypeUtils.IsPrimitiveType((x.Member as System.Reflection.PropertyInfo).PropertyType));
}
if (newExpression != null || bindings.Count() > 0)
{
// 简化内层选择器，只选择最小字段，不选择导航字段，导航字段在外层加进去
initExpression = Expression.MemberInit(newExpression, bindings);
lambdaExpression = Expression.Lambda(initExpression, lambdaExpression.Parameters);
dbQuery.Select = new DbExpression(DbExpressionType.Select, lambdaExpression);
}
dbQuery.SubQueryOfMany = true;
dbQuery.Includes = new List <DbExpression>(0);
var result_Query = new DbQueryableInfo_Select <TElement>();
result_Query.FromEntityType = type;
result_Query.SubQueryInfo = dbQuery;
result_Query.Joins = new List <DbExpression>(0);
result_Query.OrderBys = new List <DbExpression>(0);
result_Query.Includes = includes;
result_Query.HasMany = true;
result_Query.Select = new DbExpression(DbExpressionType.Select, select);
#region 排序
if (dbQuery.OrderBys.Count > 0)
{
// 是否有分页
bool havePaging = (dbQuery.Take > 0 || dbQuery.Skip > 0);
if (!havePaging)
{
// 如果没有分页，则OrderBy需要放在外层
result_Query.OrderBys = dbQuery.OrderBys;
dbQuery.OrderBys = new List <DbExpression>(0);
}
else
{
// 如果有分页，只有主表/用到的1:1从表放在内层，其它放在外层
List <DbExpression> innerOrderBy = null;
foreach (var dbExpression in dbQuery.OrderBys)
{
hasMany = IsHasMany(dbExpression.Expressions[0] as LambdaExpression);
if (!hasMany)
{
if (innerOrderBy == null)
{
innerOrderBy = new List <DbExpression>();
}
innerOrderBy.Add(dbExpression);
}
}
if (innerOrderBy != null && innerOrderBy.Count > 0)
{
result_Query.OrderBys = dbQuery.OrderBys;
dbQuery.OrderBys = innerOrderBy;
}
}
}
#endregion
#region 分组
if (dbQuery.GroupBy != null)
{
// 查看外层是否需要重新构造选择器。如果有分组并且有聚合函数，则需要重新构造选择器。否则外层解析不了聚合函数
// demo => line 1280
bool newSelector = bindings.Any(x => ((MemberAssignment)x).Expression.NodeType == ExpressionType.Call) || newExpression.Arguments.Any(x => x.NodeType == ExpressionType.Call);
if (newSelector)
{
ParameterExpression newParameter = null;
List <DbExpression> dbExpressions = null;
if (result_Query.Includes != null && result_Query.Includes.Count > 0)
{
dbExpressions = result_Query.Includes;
}
else if (result_Query.OrderBys != null && result_Query.OrderBys.Count > 0)
{
dbExpressions = result_Query.OrderBys;
}
if (dbExpressions != null && dbExpressions.Count > 0)
{
newParameter = (dbExpressions[0].Expressions[0] as LambdaExpression).Parameters[0];
}
// 1对多导航嵌套查询外层的的第一个表别名固定t0，参数名可随意
var parameterExpression = newParameter != null ? newParameter : Expression.Parameter(newExpression.Type, "__g");
bindings = bindings.ToList(x => (MemberBinding)Expression.Bind(x.Member, Expression.MakeMemberAccess(parameterExpression, x.Member)));
List <Expression> arguments = null;
if (newExpression.Members != null)
{
arguments = new List <Expression>(newExpression.Arguments.Count);
for (int i = 0; i < newExpression.Arguments.Count; i++)
{
var member = newExpression.Members[i];
var arg = Expression.MakeMemberAccess(parameterExpression, member);
arguments.Add(arg);
}
}
newExpression = Expression.New(newExpression.Constructor, arguments, newExpression.Members);
initExpression = Expression.MemberInit(newExpression, bindings);
lambdaExpression = Expression.Lambda(initExpression, parameterExpression);
result_Query.Select = new DbExpression(DbExpressionType.Select, lambdaExpression);
}
}
#endregion
dbQuery = result_Query;
}
#endregion
return(dbQuery);
}
/// <summary>
/// 将 <see cref="IDataRecord"/> 上的当前行反序列化为实体
/// </summary>
/// <param name="prevModel">前一行数据</param>
/// <param name="isThisLine">是否同一行数据</param>
internal T Deserialize(object prevModel, out bool isThisLine)
{
isThisLine = false;
#region 基元类型
if (_isPrimitive == null)
{
_isPrimitive = TypeUtils.IsPrimitiveType(typeof(T)) || _reader.GetName(0) == Constant.AUTOINCREMENTNAME;
}
if (_isPrimitive.Value)
{
if (_reader.IsDBNull(0))
{
return(default(T));
}
var obj = _reader.GetValue(0);
if (obj.GetType() != typeof(T))
{
// fix#Nullable<T> issue
if (!typeof(T).IsGenericType)
{
obj = Convert.ChangeType(obj, typeof(T));
}
else
{
Type g = typeof(T).GetGenericTypeDefinition();
if (g != typeof(Nullable <>))
{
throw new NotSupportedException(string.Format("type {0} not suppored.", g.FullName));
}
obj = Convert.ChangeType(obj, Nullable.GetUnderlyingType(typeof(T)));
}
}
return((T)obj);
}
#endregion
#region 动态类型
if (_isDynamic)
{
ExpandoObject obj = new ExpandoObject();
var result = ((IDictionary <string, object>)obj);
for (int i = 0; i < _reader.FieldCount; i++)
{
var value = _reader.GetValue(i);
if (value == DBNull.Value)
{
value = null;
}
result.Add(_reader.GetName(i), value);
}
return((dynamic)obj);
}
#endregion
#region 实体类型
T model = default(T);
if (_map == null || _map.Navigations == null || _map.Navigations.Count == 0)
{
// 没有字段映射说明或者没有导航属性
if (_modelDeserializer == null)
{
_modelDeserializer = _deserializerImpl.GetTypeDeserializer(typeof(T), _reader, _map != null ? _map.PickColumns : null, 0);
}
model = (T)_modelDeserializer(_reader);
}
else
{
// 第一层
if (_modelDeserializer == null)
{
_modelDeserializer = _deserializerImpl.GetTypeDeserializer(typeof(T), _reader, _map.PickColumns, 0, _map.Navigations.MinIndex);
}
model = (T)_modelDeserializer(_reader);
// 若有 1:n 的导航属性，判断当前行数据与上一行数据是否相同
if (prevModel != null && _map.HasMany)
{
isThisLine = true;
foreach (var invoker in _typeRuntime.KeyInvokers)
{
var value1 = invoker.Invoke(prevModel);
var value2 = invoker.Invoke(model);
isThisLine = isThisLine && value1.Equals(value2);
if (!isThisLine)
{
// fix issue#换行时清空上一行的导航键缓存
_manyNavigationKeys.Clear();
break;
}
}
}
// 递归导航属性
this.Deserialize_Navigation(isThisLine ? prevModel : null, model, string.Empty, isThisLine);
}
return(model);
#endregion
}
// 反序列化导航属性
// @prevLine 前一行数据
// @isLine 是否同一行数据<同一父级>
void Deserialize_Navigation(object prevModel, object model, string typeName, bool isThisLine)
{
// CRM_SaleOrder.Client
// CRM_SaleOrder.Client.AccountList
Type type = model.GetType();
TypeRuntimeInfo typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(type);
if (string.IsNullOrEmpty(typeName))
{
typeName = type.Name;
}
//foreach (var kvp in _map.Navigations)
foreach (var navigation in _map.Navigations)
{
int start = -1;
int end = -1;
if (navigation.FieldCount > 0)
{
start = navigation.StartIndex;
end = navigation.StartIndex + navigation.FieldCount;
}
string keyName = typeName + "." + navigation.Name;
if (keyName != navigation.KeyName)
{
continue;
}
var navInvoker = typeRuntime.GetInvoker(navigation.Name);
if (navInvoker == null)
{
continue;
}
Type navType = navInvoker.DataType;
Func <IDataRecord, object> deserializer = null;
TypeRuntimeInfo navTypeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(navType);
object navCollection = null;
//if (navType.IsGenericType && navTypeRuntime.GenericTypeDefinition == typeof(List<>))
if (TypeUtils.IsCollectionType(navType))
{
// 1：n关系，导航属性为 List<T>
navCollection = navInvoker.Invoke(model);
if (navCollection == null)
{
// new 一个列表类型，如果导航属性定义为接口，则默认使用List<T>来实例化
TypeRuntimeInfo navTypeRuntime2 = navType.IsInterface
? TypeRuntimeInfoCache.GetRuntimeInfo(typeof(List <>).MakeGenericType(navTypeRuntime.GenericArguments[0]))
: navTypeRuntime;
navCollection = navTypeRuntime2.ConstructInvoker.Invoke();
navInvoker.Invoke(model, navCollection);
}
}
if (!_deserializers.TryGetValue(keyName, out deserializer))
{
deserializer = _deserializerImpl.GetTypeDeserializer(navType.IsGenericType ? navTypeRuntime.GenericArguments[0] : navType, _reader, _map.PickColumns, start, end);
_deserializers[keyName] = deserializer;
}
// 如果整个导航链中某一个导航属性为空，则跳出递归
object navModel = deserializer(_reader);
if (navModel != null)
{
if (navCollection == null)
{
// 非集合型导航属性
navInvoker.Invoke(model, navModel);
//
//
//
}
else
{
// 集合型导航属性
if (prevModel != null && isThisLine)
{
#region 合并列表
// 判断如果属于同一个主表，则合并到上一行的当前明细列表
// 例：CRM_SaleOrder.Client.AccountList
string[] keys = keyName.Split('.');
TypeRuntimeInfo curTypeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo <T>();
Type curType = curTypeRuntime.Type;
MemberInvokerBase curInvoker = null;
object curModel = prevModel;
for (int i = 1; i < keys.Length; i++)
{
curInvoker = curTypeRuntime.GetInvoker(keys[i]);
curModel = curInvoker.Invoke(curModel);
if (curModel == null)
{
continue;
}
curType = curModel.GetType();
curTypeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(curType);
// <<<<<<<<<<< 一对多对多关系 >>>>>>>>>>
if (curType.IsGenericType && i != keys.Length - 1)
{
curTypeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(curType);
//if (curTypeRuntime.GenericTypeDefinition == typeof(List<>))
if (TypeUtils.IsCollectionType(curType))
{
var invoker = curTypeRuntime.GetInvoker("get_Count");
int count = Convert.ToInt32(invoker.Invoke(curModel)); // List.Count
if (count > 0)
{
var invoker2 = curTypeRuntime.GetInvoker("get_Item");
curModel = invoker2.Invoke(curModel, count - 1); // List[List.Count-1]
curTypeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(curModel.GetType());
}
else
{
// user.Roles.RoleFuncs=>Roles 列表有可能为空
curModel = null;
break;
}
}
}
}
if (curModel != null)
{
// 如果有两个以上的一对多关系的导航属性，那么在加入列表之前就需要剔除重复的实体
bool isAny = false;
if (_map.Navigations.Count > 1)
{
if (_manyNavigationNumber == null)
{
_manyNavigationNumber = _map.Navigations.Count(x => IsHasMany(x.Member));
}
if (_manyNavigationNumber != null && _manyNavigationNumber.Value > 1)
{
if (!_manyNavigationKeys.ContainsKey(keyName))
{
_manyNavigationKeys[keyName] = new HashSet <string>();
}
curTypeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(navModel.GetType());
StringBuilder keyBuilder = new StringBuilder(64);
foreach (var invoker in curTypeRuntime.KeyInvokers)
{
var value = invoker.Invoke(navModel);
keyBuilder.AppendFormat("{0}={1};", invoker.Name, (value ?? string.Empty).ToString());
}
string hash = keyBuilder.ToString();
if (_manyNavigationKeys[keyName].Contains(hash))
{
isAny = true;
}
else
{
_manyNavigationKeys[keyName].Add(hash);
}
}
}
if (!isAny)
{
// 如果列表中不存在，则添加到上一行的相同导航列表中去
var myAddMethod = navTypeRuntime.GetInvoker("Add");
myAddMethod.Invoke(curModel, navModel);
}
}
#endregion
}
else
{
// 此时的 navTypeRuntime 是 List<> 类型的运行时
// 先添加 List 列表
var myAddMethod = navTypeRuntime.GetInvoker("Add");
myAddMethod.Invoke(navCollection, navModel);
var curTypeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(navModel.GetType());
StringBuilder keyBuilder = new StringBuilder(64);
foreach (var invoker in curTypeRuntime.KeyInvokers)
{
var value = invoker.Invoke(navModel);
keyBuilder.AppendFormat("{0}={1};", invoker.Name, (value ?? string.Empty).ToString());
}
string hash = keyBuilder.ToString();
if (!_manyNavigationKeys.ContainsKey(keyName))
{
_manyNavigationKeys[keyName] = new HashSet <string>();
}
if (!_manyNavigationKeys[keyName].Contains(hash))
{
_manyNavigationKeys[keyName].Add(hash);
}
}
}
//if (navTypeRuntime.GenericTypeDefinition == typeof(List<>)) navTypeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(navTypeRuntime.GenericArguments[0]);
if (TypeUtils.IsCollectionType(navTypeRuntime.Type))
{
navTypeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(navTypeRuntime.GenericArguments[0]);
}
if (navTypeRuntime.NavInvokers.Count > 0)
{
Deserialize_Navigation(prevModel, navModel, keyName, isThisLine);
}
}
}
}
