コード例 #1
0
 protected InFragment TryMergeTwoBinaryFragments(BinaryFragment left, BinaryFragment right)
 {
     if ((left.IsNegated == right.IsNegated) && (!left.IsNegated) &&
         (left.Operator == "=") && (right.Operator == "="))
     {
         ColumnFragment  cf;
         LiteralFragment lf;
         GetBinaryFragmentPartsForIn(left, out lf, out cf);
         if ((lf != null) && (cf != null))
         {
             ColumnFragment  cf2;
             LiteralFragment lf2;
             GetBinaryFragmentPartsForIn(right, out lf2, out cf2);
             if ((lf2 != null) && (cf2 != null) && cf.Equals(cf2))
             {
                 InFragment inf = new InFragment();
                 inf.Argument = cf;
                 inf.InList.Add(lf);
                 inf.InList.Add(lf2);
                 return(inf);
             }
         }
     }
     return(null);
 }
コード例 #2
0
 protected InFragment TryMergeTwoInFragments(InFragment infLeft, InFragment infRight)
 {
     if (infLeft.Argument.Equals(infRight.Argument) &&
         (infLeft.IsNegated == infRight.IsNegated) && (!infLeft.IsNegated))
     {
         infLeft.InList.AddRange(infRight.InList);
         return(infLeft);
     }
     return(null);
 }
コード例 #3
0
        public override SqlFragment Visit(DbInExpression expression)
        {
            SqlFragment sf  = expression.Item.Accept(this);
            InFragment  inf = new InFragment();

            inf.Argument = sf;
            for (int i = 0; i < expression.List.Count; i++)
            {
                LiteralFragment lf = Visit(expression.List[i] as DbConstantExpression) as LiteralFragment;
                inf.InList.Add(lf);
            }
            return(inf);
        }
コード例 #4
0
 protected InFragment TryMergeBinaryFragmentAndInFragment(BinaryFragment bf, InFragment inf)
 {
     if (!bf.IsNegated && (bf.Operator == "="))
     {
         ColumnFragment  cf;
         LiteralFragment lf;
         GetBinaryFragmentPartsForIn(bf, out lf, out cf);
         if ((lf != null) && (cf != null))
         {
             if (inf.Argument.Equals(cf))
             {
                 if (!inf.InList.Contains(lf))
                 {
                     inf.InList.Add(lf);
                 }
                 return(inf);
             }
         }
     }
     return(null);
 }
コード例 #5
0
 protected virtual SqlFragment TryToPromoteToIn(BinaryFragment bf)
 {
     // TODO: Remember Morgan's theorem
     // Only try to merge if they are OR'ed.
     if ((bf.Operator == "OR"))
     {
         InFragment inf  = bf.Left as InFragment;
         InFragment inf2 = bf.Right as InFragment;
         if (inf == null)
         {
             BinaryFragment bfLeft = bf.Left as BinaryFragment;
             if (bfLeft == null)
             {
                 return(bf);
             }
             if (inf2 == null)
             {
                 // try to create a new infragment
                 BinaryFragment bfRight = bf.Right as BinaryFragment;
                 if (bfRight == null)
                 {
                     return(bf);
                 }
                 InFragment inff = TryMergeTwoBinaryFragments(bfLeft, bfRight);
                 if (inff != null)
                 {
                     return(inff);
                 }
             }
             else
             {
                 // try to merge an existing infragment & a binaryfragment.
                 SqlFragment sf = TryMergeBinaryFragmentAndInFragment(bfLeft, inf2);
                 if (sf != null)
                 {
                     return(sf);
                 }
             }
         }
         else if (inf2 == null)
         {
             BinaryFragment bfRight = bf.Right as BinaryFragment;
             if (bfRight == null)
             {
                 return(bf);
             }
             else
             {
                 // try to merge an existing infragment & a binaryfragment.
                 SqlFragment sf = TryMergeBinaryFragmentAndInFragment(bfRight, inf);
                 if (sf != null)
                 {
                     return(sf);
                 }
             }
         }
         else
         {
             // try to merge both InFragments
             SqlFragment sf = TryMergeTwoInFragments(inf, inf2);
             if (sf != null)
             {
                 return(sf);
             }
         }
     }
     return(bf);
 }
コード例 #6
0
 public void Visit(InFragment f)
 {
 }