// Client = a.Client.CloudServer
private Expression VisitNavigation(MemberExpression node, bool visitNavigation)
{
string alias = string.Empty;
Type type = node.Type;
if (node.Acceptable())
{
// 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 kvp in NavMembers)
{
index += 1;
if (index < NavMembers.Count && index > num)
{
alias = _aliases.GetNavigationTableAlias(kvp.Key);
//navKey = kvp.Key;
//if (visitNavigation) AppendNullColumn(kvp.Value.Member, alias, navKey);
continue;
}
//navKey = kvp.Key;
alias = _aliases.GetNavigationTableAlias(kvp.Key);
type = kvp.Value.Type;
}
}
else
{
}
}
else
{
// 例： Client = b
alias = _aliases.GetTableAlias(node);
type = node.Type;
}
if (type.IsGenericType)
{
type = type.GetGenericArguments()[0];
}
this.VisitAllMember(type, alias);
if (visitNavigation)
{
AppendNullColumn(node.Member, alias);
}
return(node);
}
// 添加导航属性关联
protected virtual void AppendNavigation()
{
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.HasManyNavigation)
{
_aliases = new TableAliasCache(_aliases.Declared);
}
//开始产生LEFT JOIN 子句
ISqlBuilder builder = this.JoinFragment;
foreach (var kvp in _navMembers)
{
string key = kvp.Key;
MemberExpression m = kvp.Value;
TypeRuntimeInfo typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(m.Expression.Type);
ForeignKeyAttribute attribute = typeRuntime.GetInvokerAttribute <ForeignKeyAttribute>(m.Member.Name);
string innerKey = string.Empty;
string outerKey = key;
string innerAlias = string.Empty;
if (!m.Expression.Acceptable())
{
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 (_navMembers.ContainsKey(keyLeft))
{
innerKey = keyLeft;
}
innerAlias = _aliases.GetNavigationTableAlias(innerKey);
}
}
string alias1 = !string.IsNullOrEmpty(innerAlias) ? innerAlias : _aliases.GetTableAlias(innerKey);
string alias2 = _aliases.GetNavigationTableAlias(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);
builder.Append(" ON ");
for (int i = 0; i < attribute.InnerKeys.Length; i++)
{
builder.Append(alias1);
builder.Append('.');
builder.AppendMember(attribute.InnerKeys[i]);
builder.Append(" = ");
builder.Append(alias2);
builder.Append('.');
builder.AppendMember(attribute.OuterKeys[i]);
if (i < attribute.InnerKeys.Length - 1)
{
builder.Append(" AND ");
}
}
}
}
// 添加导航属性关联
protected override void AppendNavigation()
{
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 TableAliasCache(_aliases.Declared);
}
//开始产生 USING 子句
ISqlBuilder jf = this.JoinFragment;
int index = -1;
// 未生成USING子句
if (_aliases.Declared <= 1)
{
jf.AppendNewLine();
jf.Append(_keywordName);
}
else
{
jf.Append(',');
jf.AppendNewLine();
}
foreach (var kvp in this.NavMembers)
{
index++;
string key = kvp.Key;
MemberExpression m = kvp.Value;
TypeRuntimeInfo typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(m.Expression.Type);
ForeignKeyAttribute attribute = typeRuntime.GetInvokerAttribute <ForeignKeyAttribute>(m.Member.Name);
string innerKey = string.Empty;
string outerKey = key;
string innerAlias = string.Empty;
if (!m.Expression.Acceptable())
{
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.ContainsKey(keyLeft))
{
innerKey = keyLeft;
}
innerAlias = _aliases.GetNavigationTableAlias(innerKey);
}
}
string alias1 = !string.IsNullOrEmpty(innerAlias) ? innerAlias : _aliases.GetTableAlias(innerKey);
string alias2 = _aliases.GetNavigationTableAlias(outerKey);
// 补充与USING字符串同等间距的空白
if (_aliases.Declared > 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++)
{
_onPhrase.Append(alias1);
_onPhrase.Append('.');
_onPhrase.AppendMember(attribute.InnerKeys[i]);
_onPhrase.Append(" = ");
_onPhrase.Append(alias2);
_onPhrase.Append('.');
_onPhrase.AppendMember(attribute.OuterKeys[i]);
}
if (index < this.NavMembers.Count - 1)
{
jf.Append(',');
jf.AppendNewLine();
}
}
}
// 访问导航属性
protected virtual string VisitNavMember(Expression expression, string memberName = null)
{
// 表达式 => b.Client.Address.AddressName
Expression node = expression;
Stack <KeyValuePair <string, MemberExpression> > stack = null;
string alias = string.Empty;
while (node != null && node.Acceptable())
{
if (node.NodeType != ExpressionType.MemberAccess)
{
break;
}
if (stack == null)
{
stack = new Stack <KeyValuePair <string, MemberExpression> >();
}
MemberExpression memberExpression = node as MemberExpression;
TypeRuntimeInfo typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(memberExpression.Expression.Type);
ForeignKeyAttribute attribute = typeRuntime.GetInvokerAttribute <ForeignKeyAttribute>(memberExpression.Member.Name);
if (attribute == null)
{
break;
}
string key = memberExpression.GetKeyWidthoutAnonymous();
stack.Push(new KeyValuePair <string, MemberExpression>(key, memberExpression));
node = memberExpression.Expression;
if (node.NodeType == ExpressionType.Call)
{
node = (node as MethodCallExpression).Object;
}
}
if (stack != null && stack.Count > 0)
{
while (stack != null && stack.Count > 0)
{
KeyValuePair <string, MemberExpression> kvp = stack.Pop();
string key = kvp.Key;
MemberExpression m = kvp.Value;
Type type = m.Type;
if (type.IsGenericType)
{
type = type.GetGenericArguments()[0];
}
TypeRuntimeInfo typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(type);
// 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.GetNavigationTableAlias(key);
if (!_navMembers.ContainsKey(kvp.Key))
{
_navMembers.Add(kvp);
}
}
// 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)
{
string alias = string.Empty;
Type type = node.Type;
if (node.Acceptable())
{
// 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 kvp in NavMembers)
{
index += 1;
if (index < NavMembers.Count && index > num)
{
alias = _aliases.GetNavigationTableAlias(kvp.Key);
}
else
{
alias = _aliases.GetNavigationTableAlias(kvp.Key);
type = kvp.Value.Type;
}
}
}
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 expr = pickExpression;
if (expr.NodeType == ExpressionType.Lambda)
{
expr = (pickExpression as LambdaExpression).Body;
}
if (expr.NodeType == ExpressionType.New)
{
var newExpression = expr 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);
}
_builder.AppendMember(alias, memberExpression.Member.Name);
this.AddPickColumn(newExpression.Members != null ? newExpression.Members[i].Name : memberExpression.Member.Name);
}
}
else if (expr.NodeType == ExpressionType.MemberInit)
{
var initExpression = expr 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);
}
_builder.AppendMember(alias, memberExpression.Member.Name);
this.AddPickColumn(binding.Member.Name);
}
}
else
{
throw new NotSupportedException(string.Format("Include method not supporte {0}", expr.NodeType));
}
}
if (visitNavigation)
{
AddSplitOnColumn(node.Member, alias);
}
return(node);
}