private void MemberAccessResolve(Expression exp)
{
if (exp == null || !(exp is MemberExpression memberExp))
{
return;
}
if (memberExp.Expression != null)
{
if (memberExp.Expression.NodeType == ExpressionType.Parameter)
{
_sqlBuilder.Append(_queryBody.GetColumnName(memberExp, _fullExpression));
return;
}
if (memberExp.Expression.NodeType == ExpressionType.Constant)
{
DynamicInvokeResolve(exp);
return;
}
if (memberExp.Expression.NodeType == ExpressionType.MemberAccess)
{
if (memberExp.Expression is MemberExpression subMemberExp && subMemberExp.Expression.NodeType == ExpressionType.Constant)
{
DynamicInvokeResolve(exp);
return;
}
//分组查询
if (_queryBody.IsGroupBy)
{
var descriptor = _queryBody.GroupByPropertyList.FirstOrDefault(m => m.Alias == memberExp.Member.Name);
if (descriptor != null)
{
var colName = _queryBody.GetColumnName(descriptor.Name, descriptor.JoinDescriptor);
_sqlBuilder.AppendFormat("{0}", colName);
return;
}
}
else if (memberExp.Expression.Type.IsString())
{
switch (memberExp.Member.Name)
{
case "Length":
//解析Length函数
var funcName = _sqlAdapter.FuncLength;
var colName = _queryBody.GetColumnName(memberExp.Expression as MemberExpression, _fullExpression);
_sqlBuilder.AppendFormat("{0}({1})", funcName, colName);
return;
}
}
}
}
//对于非实体属性的成员，如外部变量等
DynamicInvokeResolve(exp);
}