/// <summary>
/// 添加导航属性关联
/// </summary>
protected override void ResoveNavMember()
{
if (this.NavMembers == null || this.NavMembers.Count == 0)
{
return;
}
// 如果有一对多的导航属性，肯定会产生嵌套查询。那么内层查询别名肯定是t0，所以需要清掉
if (this.HasMany)
{
_aliases = new TableAlias(_aliases.HoldQty);
}
//开始产生 USING 子句
ISqlBuilder jf = this.JoinFragment;
int index = -1;
// 未生成USING子句
if (_aliases.HoldQty <= 1)
{
jf.AppendNewLine();
jf.Append(_keywordName);
}
else
{
jf.Append(',');
jf.AppendNewLine();
}
foreach (var nav in this.NavMembers)
{
index++;
string key = nav.KeyId;
MemberExpression m = nav.Expression;
TypeRuntimeInfo typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(m.Expression.Type);
ForeignKeyAttribute attribute = typeRuntime.GetMemberAttribute <ForeignKeyAttribute>(m.Member.Name);
string innerKey = string.Empty;
string outerKey = key;
string innerAlias = string.Empty;
if (!m.Expression.Visitable())
{
innerKey = m.Expression.NodeType == ExpressionType.Parameter
? (m.Expression as ParameterExpression).Name
: (m.Expression as MemberExpression).Member.Name;
}
else
{
MemberExpression mLeft = null;
if (m.Expression.NodeType == ExpressionType.MemberAccess)
{
mLeft = m.Expression as MemberExpression;
}
else if (m.Expression.NodeType == ExpressionType.Call)
{
mLeft = (m.Expression as MethodCallExpression).Object as MemberExpression;
}
string name = TypeRuntimeInfoCache.GetRuntimeInfo(mLeft.Type).TableName;
innerAlias = _aliases.GetJoinTableAlias(name);
if (string.IsNullOrEmpty(innerAlias))
{
string keyLeft = mLeft.GetKeyWidthoutAnonymous();
if (this.NavMembers.Contains(keyLeft))
{
innerKey = keyLeft;
}
innerAlias = _aliases.GetNavTableAlias(innerKey);
}
}
string alias1 = !string.IsNullOrEmpty(innerAlias) ? innerAlias : _aliases.GetTableAlias(innerKey);
string alias2 = _aliases.GetNavTableAlias(outerKey);
// 补充与USING字符串同等间距的空白
if (_aliases.HoldQty > 1 || index > 0)
{
jf.Append(_pad);
}
Type type = m.Type;
var typeRumtime2 = TypeRuntimeInfoCache.GetRuntimeInfo(type);
if (type.IsGenericType)
{
type = type.GetGenericArguments()[0];
}
jf.AppendMember(typeRumtime2.TableName, typeRumtime2.IsTemporary);
jf.Append(' ');
jf.Append(alias2);
if (_onPhrase.Length > 0)
{
_onPhrase.Append(" AND ");
}
for (int i = 0; i < attribute.InnerKeys.Length; i++)
{
if (attribute.InnerKeys[i].StartsWith(Constant.CONSTANT_FOREIGNKEY, StringComparison.Ordinal))
{
_onPhrase.Append(attribute.InnerKeys[i].Substring(7));
}
else
{
_onPhrase.Append(alias1);
_onPhrase.Append('.');
_onPhrase.AppendMember(attribute.InnerKeys[i]);
}
_onPhrase.Append(" = ");
if (attribute.OuterKeys[i].StartsWith(Constant.CONSTANT_FOREIGNKEY, StringComparison.Ordinal))
{
_onPhrase.Append(attribute.OuterKeys[i].Substring(7));
}
else
{
_onPhrase.Append(alias2);
_onPhrase.Append('.');
_onPhrase.AppendMember(attribute.OuterKeys[i]);
}
}
if (nav.Predicate != null)
{
string alias = _aliases.GetNavTableAlias(nav.KeyId);
var visitor = new NavPredicateExpressionVisitor(_provider, _aliases, nav.Predicate, alias);
visitor.Write(_onPhrase);
}
if (index < this.NavMembers.Count - 1)
{
jf.Append(',');
jf.AppendNewLine();
}
}
}
// 添加导航属性关联
protected override void ResoveNavMember()
{
if (base.NavMembers == null || base.NavMembers.Count == 0)
{
return;
}
// 如果有一对多的导航属性，肯定会产生嵌套查询。那么内层查询别名肯定是t0，所以需要清掉
if (this.HasMany)
{
_aliases = new TableAlias(_aliases.HoldQty);
}
//开始产生LEFT JOIN 子句
ISqlBuilder builder = this.JoinFragment;
foreach (var nav in base.NavMembers)
{
string key = nav.KeyId;
MemberExpression m = nav.Expression;
TypeRuntimeInfo typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(m.Expression.Type);
ForeignKeyAttribute attribute = typeRuntime.GetMemberAttribute <ForeignKeyAttribute>(m.Member.Name);
string innerKey = string.Empty;
string outerKey = key;
string innerAlias = string.Empty;
if (!m.Expression.Visitable())
{
innerKey = m.Expression.NodeType == ExpressionType.Parameter
? (m.Expression as ParameterExpression).Name
: (m.Expression as MemberExpression).Member.Name;
}
else
{
MemberExpression mLeft = null;
if (m.Expression.NodeType == ExpressionType.MemberAccess)
{
mLeft = m.Expression as MemberExpression;
}
else if (m.Expression.NodeType == ExpressionType.Call)
{
mLeft = (m.Expression as MethodCallExpression).Object as MemberExpression;
}
string name = TypeRuntimeInfoCache.GetRuntimeInfo(mLeft.Type).TableName;
innerAlias = _aliases.GetJoinTableAlias(name);
if (string.IsNullOrEmpty(innerAlias))
{
string keyLeft = mLeft.GetKeyWidthoutAnonymous();
if (base.NavMembers.Contains(keyLeft))
{
innerKey = keyLeft;
}
innerAlias = _aliases.GetNavTableAlias(innerKey);
}
}
string alias1 = !string.IsNullOrEmpty(innerAlias) ? innerAlias : _aliases.GetTableAlias(innerKey);
string alias2 = _aliases.GetNavTableAlias(outerKey);
builder.AppendNewLine();
builder.Append("LEFT JOIN ");
Type type = m.Type;
if (type.IsGenericType)
{
type = type.GetGenericArguments()[0];
}
var typeRuntime2 = TypeRuntimeInfoCache.GetRuntimeInfo(type);
builder.AppendMember(typeRuntime2.TableName, !typeRuntime2.IsTemporary);
builder.Append(" ");
builder.Append(alias2);
bool withNoLock = !typeRuntime2.IsTemporary && _context.NoLock && !string.IsNullOrEmpty(_provider.WidthNoLock);
if (withNoLock)
{
builder.Append(' ');
builder.Append(_provider.WidthNoLock);
}
builder.Append(" ON ");
for (int i = 0; i < attribute.InnerKeys.Length; i++)
{
if (attribute.InnerKeys[i].StartsWith(Constant.CONSTANT_FOREIGNKEY, StringComparison.Ordinal))
{
builder.Append(attribute.InnerKeys[i].Substring(7));
}
else
{
builder.Append(alias1);
builder.Append('.');
builder.AppendMember(attribute.InnerKeys[i]);
}
builder.Append(" = ");
if (attribute.OuterKeys[i].StartsWith(Constant.CONSTANT_FOREIGNKEY, StringComparison.Ordinal))
{
builder.Append(attribute.OuterKeys[i].Substring(7));
}
else
{
builder.Append(alias2);
builder.Append('.');
builder.AppendMember(attribute.OuterKeys[i]);
}
if (i < attribute.InnerKeys.Length - 1)
{
builder.Append(" AND ");
}
}
if (nav.Predicate != null)
{
string alias = _aliases.GetNavTableAlias(nav.KeyId);
var visitor = new NavPredicateExpressionVisitor(_provider, _aliases, nav.Predicate, alias);
visitor.Write(builder);
}
}
}
/// <summary>
/// 访问导航属性
/// </summary>
/// <param name="expression">导航属性表达式</param>
/// <param name="memberName">成员名称</param>
/// <returns></returns>
protected virtual string VisitNavMember(Expression expression, string memberName = null)
{
// 表达式 => b.Client.Address.AddressName
Expression node = expression;
Stack <NavMember> stack = null;
string alias = string.Empty;
while (node != null && node.Visitable())
{
if (node.NodeType != ExpressionType.MemberAccess)
{
break;
}
if (stack == null)
{
stack = new Stack <NavMember>();
}
var member = node as MemberExpression;
var typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(member.Expression.Type);
ForeignKeyAttribute attribute = typeRuntime.GetMemberAttribute <ForeignKeyAttribute>(member.Member.Name);
if (attribute == null)
{
break;
}
string key = member.GetKeyWidthoutAnonymous();
stack.Push(new NavMember(key, member));
node = member.Expression;
if (node.NodeType == ExpressionType.Call)
{
node = (node as MethodCallExpression).Object;
}
}
if (stack != null && stack.Count > 0)
{
while (stack != null && stack.Count > 0)
{
NavMember nav = stack.Pop();
Type type = nav.Expression.Type;
if (type.IsGenericType)
{
type = type.GetGenericArguments()[0];
}
var typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(type);
// 检查表达式是否由 GetTable<,>(path) 显式指定过别名
alias = _aliases.GetGetTableAlias(nav.KeyId);
if (string.IsNullOrEmpty(alias))
{
// 如果没有，检查查询表达式是否显示指定该表关联
alias = _aliases.GetJoinTableAlias(typeRuntime.TableName);
}
if (string.IsNullOrEmpty(alias))
{
// 如果没有，则使用导航属性别名
alias = _aliases.GetNavTableAlias(nav.KeyId);
if (!_navMembers.Contains(nav.KeyId))
{
_navMembers.Add(nav);
}
}
// 例： a.Client.ClientId
if (stack.Count == 0 && !string.IsNullOrEmpty(memberName))
{
_builder.AppendMember(alias, memberName);
}
}
}
else
{
// => SelectMany 也会产生类似 'b.Client.Address.AddressName' 这样的表达式
alias = _aliases.GetTableAlias(expression);
_builder.AppendMember(alias, memberName);
}
// Fix issue# Join 表达式显式指定导航属性时时，alias 为空
return(alias);
}
// => Client = a.Client.CloudServer
private Expression VisitNavigation(MemberExpression node, bool visitNavigation, Expression pickExpression = null, Expression predicate = null)
{
string alias = string.Empty;
Type type = node.Type;
if (node.Visitable())
{
// 例： Client = a.Client.CloudServer
// Fix issue# Join 表达式显式指定导航属性时时，alias 为空
// Fix issue# 多个导航属性时 AppendNullColumn 只解析当前表达式的
int index = 0;
int num = this.NavMembers != null ? this.NavMembers.Count : 0;
alias = this.VisitNavMember(node);
if (num != this.NavMembers.Count)
{
foreach (var nav in this.NavMembers)
{
index += 1;
if (index < this.NavMembers.Count && index > num)
{
alias = _aliases.GetNavTableAlias(nav.KeyId);
}
else
{
alias = _aliases.GetNavTableAlias(nav.KeyId);
type = nav.Expression.Type;
if (index == this.NavMembers.Count)
{
nav.Predicate = predicate;
}
}
}
}
else
{
}
}
else
{
// 例： Client = b
alias = _aliases.GetTableAlias(node);
type = node.Type;
}
if (type.IsGenericType)
{
type = type.GetGenericArguments()[0];
}
if (pickExpression == null)
{
this.VisitAllMember(type, alias);
}
else
{
// Include 中选中的字段
Expression expression = pickExpression;
if (expression.NodeType == ExpressionType.Lambda)
{
expression = (pickExpression as LambdaExpression).Body;
}
if (expression.NodeType == ExpressionType.New)
{
var newExpression = expression as NewExpression;
for (int i = 0; i < newExpression.Arguments.Count; i++)
{
var memberExpression = newExpression.Arguments[i] as MemberExpression;
if (memberExpression == null)
{
throw new XFrameworkException("MemberExpression required at the {0} arguments.", i);
}
if (memberExpression.CanEvaluate())
{
base.Visit(memberExpression);
}
else
{
_builder.AppendMember(alias, memberExpression.Member.Name);
}
this.AddPickColumn(newExpression.Members != null ? newExpression.Members[i].Name : memberExpression.Member.Name);
}
}
else if (expression.NodeType == ExpressionType.MemberInit)
{
var initExpression = expression as MemberInitExpression;
for (int i = 0; i < initExpression.Bindings.Count; i++)
{
var binding = initExpression.Bindings[i] as MemberAssignment;
if (binding == null)
{
throw new XFrameworkException("Only 'MemberAssignment' binding supported.");
}
var memberExpression = binding.Expression as MemberExpression;
if (memberExpression == null)
{
throw new XFrameworkException("MemberExpression required at the {0} arguments.", i);
}
if (memberExpression.CanEvaluate())
{
base.Visit(memberExpression);
}
else
{
_builder.AppendMember(alias, memberExpression.Member.Name);
}
this.AddPickColumn(binding.Member.Name);
}
}
else
{
throw new NotSupportedException(string.Format("Include method not support {0}", expression.NodeType));
}
}
if (visitNavigation)
{
AddSplitOnColumn(node.Member, alias);
}
return(node);
}