internal override SqlExpression VisitUnaryOperator(SqlUnary fc)
{
// process the arguments
SqlExpression result = base.VisitUnaryOperator(fc);
if (result is SqlUnary)
{
SqlUnary unary = (SqlUnary)result;
switch (unary.NodeType)
{
case SqlNodeType.ClrLength:
SqlExpression expr = unary.Operand;
result = sql.DATALENGTH(expr);
if (expr.SqlType.IsUnicodeType)
{
result = sql.Divide(result, sql.ValueFromObject(2, expr.SourceExpression));
}
result = sql.ConvertToInt(result);
break;
default:
break;
}
}
return(result);
}
internal SqlExpression TranslateLinkIsNull(SqlUnary expr)
{
System.Diagnostics.Debug.Assert(expr.NodeType == SqlNodeType.IsNull || expr.NodeType == SqlNodeType.IsNotNull);
SqlLink link = expr.Operand as SqlLink;
if (!(link != null && link.Member.IsAssociation && link.Member.Association.IsForeignKey))
{
return(expr);
}
List <SqlExpression> exprs = link.KeyExpressions;
System.Diagnostics.Debug.Assert(exprs.Count > 0);
SqlExpression exp = null;
SqlNodeType combo = (expr.NodeType == SqlNodeType.IsNull) ? SqlNodeType.Or : SqlNodeType.And;
for (int i = 0, n = exprs.Count; i < n; i++)
{
SqlExpression compare = sql.Unary(expr.NodeType, sql.DoNotVisitExpression(exprs[i]), expr.SourceExpression);
if (exp == null)
{
exp = compare;
}
else
{
exp = sql.Binary(combo, exp, compare);
}
}
return(exp);
}
internal override SqlExpression VisitTreat(SqlUnary t)
{
t.Operand = this.VisitExpression(t.Operand);
Type treatType = t.ClrType;
Type originalType = model.GetMetaType(t.Operand.ClrType).InheritanceRoot.Type;
// .NET nullability rules are that typeof(int)==typeof(int?). Let's be consistent with that:
treatType = TypeSystem.GetNonNullableType(treatType);
originalType = TypeSystem.GetNonNullableType(originalType);
if (treatType == originalType)
{
return(t.Operand);
}
else if (treatType.IsAssignableFrom(originalType))
{
t.Operand.SetClrType(treatType);
return(t.Operand);
}
else if (!treatType.IsAssignableFrom(originalType) && !originalType.IsAssignableFrom(treatType))
{
if (!treatType.IsInterface && !originalType.IsInterface) // You can't tell when there's an interface involved.
// We statically know the TREAT will result in NULL.
{
return(sql.TypedLiteralNull(treatType, t.SourceExpression));
}
}
//return base.VisitTreat(t);
return(t);
}
internal override SqlExpression VisitUnaryOperator(SqlUnary uo)
{
base.VisitUnaryOperator(uo);
if (uo.NodeType != SqlNodeType.Convert && uo.Operand != null && uo.Operand.SqlType != null)
{
uo.SetSqlType(this.typeProvider.PredictTypeForUnary(uo.NodeType, uo.Operand.SqlType));
}
return(uo);
}
internal override SqlExpression VisitUnaryOperator(SqlUnary uo)
{
if (uo.NodeType.IsUnaryOperatorExpectingPredicateOperand())
{
uo.Operand = this.VisitPredicate(uo.Operand);
}
else
{
uo.Operand = this.VisitExpression(uo.Operand);
}
return(uo);
}
internal override SqlExpression VisitUnaryOperator(SqlUnary uo)
{
switch (uo.NodeType)
{
case SqlNodeType.Min:
case SqlNodeType.Max:
case SqlNodeType.Avg:
case SqlNodeType.Sum:
case SqlNodeType.Count:
case SqlNodeType.LongCount:
this.hasAggregates = true;
return(uo);
default:
return(base.VisitUnaryOperator(uo));
}
}
internal SqlExpression TranslateLinkIsNull(SqlUnary expr)
{
var sqlLink = expr.Operand as SqlLink;
if (sqlLink == null || !sqlLink.Member.IsAssociation || !sqlLink.Member.Association.IsForeignKey)
{
return(expr);
}
var keyExpressions = sqlLink.KeyExpressions;
SqlExpression sqlExpression = null;
var nodeType = (expr.NodeType == SqlNodeType.IsNull) ? SqlNodeType.Or : SqlNodeType.And;
var i = 0;
for (var count = keyExpressions.Count; i < count; i++)
{
SqlExpression sqlExpression2 = sql.Unary(expr.NodeType, sql.DoNotVisitExpression(keyExpressions[i]), expr.SourceExpression);
sqlExpression = ((sqlExpression != null) ? sql.Binary(nodeType, sqlExpression, sqlExpression2) : sqlExpression2);
}
return(sqlExpression);
}
private SqlExpression ExpandTogether(List <SqlExpression> exprs)
{
switch (exprs[0].NodeType)
{
case SqlNodeType.MethodCall: {
SqlMethodCall[] mcs = new SqlMethodCall[exprs.Count];
for (int i = 0; i < mcs.Length; ++i)
{
mcs[i] = (SqlMethodCall)exprs[i];
}
List <SqlExpression> expandedArgs = new List <SqlExpression>();
for (int i = 0; i < mcs[0].Arguments.Count; ++i)
{
List <SqlExpression> args = new List <SqlExpression>();
for (int j = 0; j < mcs.Length; ++j)
{
args.Add(mcs[j].Arguments[i]);
}
SqlExpression expanded = this.ExpandTogether(args);
expandedArgs.Add(expanded);
}
return(factory.MethodCall(mcs[0].Method, mcs[0].Object, expandedArgs.ToArray(), mcs[0].SourceExpression));
}
case SqlNodeType.ClientCase: {
// Are they all the same?
SqlClientCase[] scs = new SqlClientCase[exprs.Count];
scs[0] = (SqlClientCase)exprs[0];
for (int i = 1; i < scs.Length; ++i)
{
scs[i] = (SqlClientCase)exprs[i];
}
// Expand expressions together.
List <SqlExpression> expressions = new List <SqlExpression>();
for (int i = 0; i < scs.Length; ++i)
{
expressions.Add(scs[i].Expression);
}
SqlExpression expression = this.ExpandTogether(expressions);
// Expand individual expressions together.
List <SqlClientWhen> whens = new List <SqlClientWhen>();
for (int i = 0; i < scs[0].Whens.Count; ++i)
{
List <SqlExpression> scos = new List <SqlExpression>();
for (int j = 0; j < scs.Length; ++j)
{
SqlClientWhen when = scs[j].Whens[i];
scos.Add(when.Value);
}
whens.Add(new SqlClientWhen(scs[0].Whens[i].Match, this.ExpandTogether(scos)));
}
return(new SqlClientCase(scs[0].ClrType, expression, whens, scs[0].SourceExpression));
}
case SqlNodeType.TypeCase: {
// Are they all the same?
SqlTypeCase[] tcs = new SqlTypeCase[exprs.Count];
tcs[0] = (SqlTypeCase)exprs[0];
for (int i = 1; i < tcs.Length; ++i)
{
tcs[i] = (SqlTypeCase)exprs[i];
}
// Expand discriminators together.
List <SqlExpression> discriminators = new List <SqlExpression>();
for (int i = 0; i < tcs.Length; ++i)
{
discriminators.Add(tcs[i].Discriminator);
}
SqlExpression discriminator = this.ExpandTogether(discriminators);
// Write expanded discriminators back in.
for (int i = 0; i < tcs.Length; ++i)
{
tcs[i].Discriminator = discriminators[i];
}
// Expand individual type bindings together.
List <SqlTypeCaseWhen> whens = new List <SqlTypeCaseWhen>();
for (int i = 0; i < tcs[0].Whens.Count; ++i)
{
List <SqlExpression> scos = new List <SqlExpression>();
for (int j = 0; j < tcs.Length; ++j)
{
SqlTypeCaseWhen when = tcs[j].Whens[i];
scos.Add(when.TypeBinding);
}
SqlExpression expanded = this.ExpandTogether(scos);
whens.Add(new SqlTypeCaseWhen(tcs[0].Whens[i].Match, expanded));
}
return(factory.TypeCase(tcs[0].ClrType, tcs[0].RowType, discriminator, whens, tcs[0].SourceExpression));
}
case SqlNodeType.New: {
// first verify all are similar client objects...
SqlNew[] cobs = new SqlNew[exprs.Count];
cobs[0] = (SqlNew)exprs[0];
for (int i = 1, n = exprs.Count; i < n; i++)
{
if (exprs[i] == null || exprs[i].NodeType != SqlNodeType.New)
{
throw Error.UnionIncompatibleConstruction();
}
cobs[i] = (SqlNew)exprs[1];
if (cobs[i].Members.Count != cobs[0].Members.Count)
{
throw Error.UnionDifferentMembers();
}
for (int m = 0, mn = cobs[0].Members.Count; m < mn; m++)
{
if (cobs[i].Members[m].Member != cobs[0].Members[m].Member)
{
throw Error.UnionDifferentMemberOrder();
}
}
}
SqlMemberAssign[] bindings = new SqlMemberAssign[cobs[0].Members.Count];
for (int m = 0, mn = bindings.Length; m < mn; m++)
{
List <SqlExpression> mexprs = new List <SqlExpression>();
for (int i = 0, n = exprs.Count; i < n; i++)
{
mexprs.Add(cobs[i].Members[m].Expression);
}
bindings[m] = new SqlMemberAssign(cobs[0].Members[m].Member, this.ExpandTogether(mexprs));
for (int i = 0, n = exprs.Count; i < n; i++)
{
cobs[i].Members[m].Expression = mexprs[i];
}
}
SqlExpression[] arguments = new SqlExpression[cobs[0].Args.Count];
for (int m = 0, mn = arguments.Length; m < mn; ++m)
{
List <SqlExpression> mexprs = new List <SqlExpression>();
for (int i = 0, n = exprs.Count; i < n; i++)
{
mexprs.Add(cobs[i].Args[m]);
}
arguments[m] = ExpandTogether(mexprs);
}
return(factory.New(cobs[0].MetaType, cobs[0].Constructor, arguments, cobs[0].ArgMembers, bindings, exprs[0].SourceExpression));
}
case SqlNodeType.Link: {
SqlLink[] links = new SqlLink[exprs.Count];
links[0] = (SqlLink)exprs[0];
for (int i = 1, n = exprs.Count; i < n; i++)
{
if (exprs[i] == null || exprs[i].NodeType != SqlNodeType.Link)
{
throw Error.UnionIncompatibleConstruction();
}
links[i] = (SqlLink)exprs[i];
if (links[i].KeyExpressions.Count != links[0].KeyExpressions.Count ||
links[i].Member != links[0].Member ||
(links[i].Expansion != null) != (links[0].Expansion != null))
{
throw Error.UnionIncompatibleConstruction();
}
}
SqlExpression[] kexprs = new SqlExpression[links[0].KeyExpressions.Count];
List <SqlExpression> lexprs = new List <SqlExpression>();
for (int k = 0, nk = links[0].KeyExpressions.Count; k < nk; k++)
{
lexprs.Clear();
for (int i = 0, n = exprs.Count; i < n; i++)
{
lexprs.Add(links[i].KeyExpressions[k]);
}
kexprs[k] = this.ExpandTogether(lexprs);
for (int i = 0, n = exprs.Count; i < n; i++)
{
links[i].KeyExpressions[k] = lexprs[i];
}
}
SqlExpression expansion = null;
if (links[0].Expansion != null)
{
lexprs.Clear();
for (int i = 0, n = exprs.Count; i < n; i++)
{
lexprs.Add(links[i].Expansion);
}
expansion = this.ExpandTogether(lexprs);
for (int i = 0, n = exprs.Count; i < n; i++)
{
links[i].Expansion = lexprs[i];
}
}
return(new SqlLink(links[0].Id, links[0].RowType, links[0].ClrType, links[0].SqlType, links[0].Expression, links[0].Member, kexprs, expansion, links[0].SourceExpression));
}
case SqlNodeType.Value: {
/*
* ExprSet of all literals of the same value reduce to just a single literal.
*/
SqlValue val0 = (SqlValue)exprs[0];
for (int i = 1; i < exprs.Count; ++i)
{
SqlValue val = (SqlValue)exprs[i];
if (!object.Equals(val.Value, val0.Value))
{
return(this.ExpandIntoExprSet(exprs));
}
}
return(val0);
}
case SqlNodeType.OptionalValue: {
if (exprs[0].SqlType.CanBeColumn)
{
goto default;
}
List <SqlExpression> hvals = new List <SqlExpression>(exprs.Count);
List <SqlExpression> vals = new List <SqlExpression>(exprs.Count);
for (int i = 0, n = exprs.Count; i < n; i++)
{
if (exprs[i] == null || exprs[i].NodeType != SqlNodeType.OptionalValue)
{
throw Error.UnionIncompatibleConstruction();
}
SqlOptionalValue sov = (SqlOptionalValue)exprs[i];
hvals.Add(sov.HasValue);
vals.Add(sov.Value);
}
return(new SqlOptionalValue(this.ExpandTogether(hvals), this.ExpandTogether(vals)));
}
case SqlNodeType.OuterJoinedValue: {
if (exprs[0].SqlType.CanBeColumn)
{
goto default;
}
List <SqlExpression> values = new List <SqlExpression>(exprs.Count);
for (int i = 0, n = exprs.Count; i < n; i++)
{
if (exprs[i] == null || exprs[i].NodeType != SqlNodeType.OuterJoinedValue)
{
throw Error.UnionIncompatibleConstruction();
}
SqlUnary su = (SqlUnary)exprs[i];
values.Add(su.Operand);
}
return(factory.Unary(SqlNodeType.OuterJoinedValue, this.ExpandTogether(values)));
}
case SqlNodeType.DiscriminatedType: {
SqlDiscriminatedType sdt0 = (SqlDiscriminatedType)exprs[0];
List <SqlExpression> foos = new List <SqlExpression>(exprs.Count);
foos.Add(sdt0.Discriminator);
for (int i = 1, n = exprs.Count; i < n; i++)
{
SqlDiscriminatedType sdtN = (SqlDiscriminatedType)exprs[i];
if (sdtN.TargetType != sdt0.TargetType)
{
throw Error.UnionIncompatibleConstruction();
}
foos.Add(sdtN.Discriminator);
}
return(factory.DiscriminatedType(this.ExpandTogether(foos), ((SqlDiscriminatedType)exprs[0]).TargetType));
}
case SqlNodeType.ClientQuery:
case SqlNodeType.Multiset:
case SqlNodeType.Element:
case SqlNodeType.Grouping:
throw Error.UnionWithHierarchy();
default:
return(this.ExpandIntoExprSet(exprs));
}
}
internal static bool?CanBeNull(SqlExpression expr)
{
switch (expr.NodeType)
{
case SqlNodeType.ExprSet:
SqlExprSet exprSet = (SqlExprSet)expr;
return(CanBeNull(exprSet.Expressions));
case SqlNodeType.SimpleCase:
SqlSimpleCase sc = (SqlSimpleCase)expr;
return(CanBeNull(sc.Whens.Select(w => w.Value)));
case SqlNodeType.Column:
SqlColumn col = (SqlColumn)expr;
if (col.MetaMember != null)
{
return(col.MetaMember.CanBeNull);
}
else if (col.Expression != null)
{
return(CanBeNull(col.Expression));
}
return(null); // Don't know.
case SqlNodeType.ColumnRef:
SqlColumnRef cref = (SqlColumnRef)expr;
return(CanBeNull(cref.Column));
case SqlNodeType.Value:
return(((SqlValue)expr).Value == null);
case SqlNodeType.New:
case SqlNodeType.Multiset:
case SqlNodeType.Grouping:
case SqlNodeType.DiscriminatedType:
case SqlNodeType.IsNotNull: // IsNull\IsNotNull always return true or false and can never return NULL.
case SqlNodeType.IsNull:
case SqlNodeType.Exists:
return(false);
case SqlNodeType.Add:
case SqlNodeType.Sub:
case SqlNodeType.Mul:
case SqlNodeType.Div:
case SqlNodeType.Mod:
case SqlNodeType.BitAnd:
case SqlNodeType.BitOr:
case SqlNodeType.BitXor:
case SqlNodeType.Concat: {
SqlBinary bop = (SqlBinary)expr;
bool? left = CanBeNull(bop.Left);
bool? right = CanBeNull(bop.Right);
return((left != false) || (right != false));
}
case SqlNodeType.Negate:
case SqlNodeType.BitNot: {
SqlUnary uop = (SqlUnary)expr;
return(CanBeNull(uop.Operand));
}
case SqlNodeType.Lift: {
SqlLift lift = (SqlLift)expr;
return(CanBeNull(lift.Expression));
}
case SqlNodeType.OuterJoinedValue:
return(true);
default:
return(null); // Don't know.
}
}
internal virtual SqlExpression VisitTreat(SqlUnary t)
{
t.Operand = this.VisitExpression(t.Operand);
return(t);
}
internal virtual SqlExpression VisitCast(SqlUnary c)
{
c.Operand = this.VisitExpression(c.Operand);
return(c);
}
internal virtual SqlExpression VisitUnaryOperator(SqlUnary uo)
{
uo.Operand = this.VisitExpression(uo.Operand);
return(uo);
}
internal override SqlExpression VisitTreat(SqlUnary t) => new SqlUnary(SqlNodeType.Treat, t.ClrType, t.SqlType, (SqlExpression)Visit(t.Operand), t.SourceExpression);
internal static bool AreEqual(SqlNode node1, SqlNode node2)
{
if (node1 == node2)
{
return(true);
}
if (node1 == null || node2 == null)
{
return(false);
}
if (node1.NodeType == SqlNodeType.SimpleCase)
{
node1 = UnwrapTrivialCaseExpression((SqlSimpleCase)node1);
}
if (node2.NodeType == SqlNodeType.SimpleCase)
{
node2 = UnwrapTrivialCaseExpression((SqlSimpleCase)node2);
}
if (node1.NodeType != node2.NodeType)
{
// allow expression sets to compare against single expressions
if (node1.NodeType == SqlNodeType.ExprSet)
{
SqlExprSet eset = (SqlExprSet)node1;
for (int i = 0, n = eset.Expressions.Count; i < n; i++)
{
if (AreEqual(eset.Expressions[i], node2))
{
return(true);
}
}
}
else if (node2.NodeType == SqlNodeType.ExprSet)
{
SqlExprSet eset = (SqlExprSet)node2;
for (int i = 0, n = eset.Expressions.Count; i < n; i++)
{
if (AreEqual(node1, eset.Expressions[i]))
{
return(true);
}
}
}
return(false);
}
if (node1.Equals(node2))
{
return(true);
}
switch (node1.NodeType)
{
case SqlNodeType.Not:
case SqlNodeType.Not2V:
case SqlNodeType.Negate:
case SqlNodeType.BitNot:
case SqlNodeType.IsNull:
case SqlNodeType.IsNotNull:
case SqlNodeType.Count:
case SqlNodeType.Max:
case SqlNodeType.Min:
case SqlNodeType.Sum:
case SqlNodeType.Avg:
case SqlNodeType.Stddev:
case SqlNodeType.ValueOf:
case SqlNodeType.OuterJoinedValue:
case SqlNodeType.ClrLength:
return(AreEqual(((SqlUnary)node1).Operand, ((SqlUnary)node2).Operand));
case SqlNodeType.Add:
case SqlNodeType.Sub:
case SqlNodeType.Mul:
case SqlNodeType.Div:
case SqlNodeType.Mod:
case SqlNodeType.BitAnd:
case SqlNodeType.BitOr:
case SqlNodeType.BitXor:
case SqlNodeType.And:
case SqlNodeType.Or:
case SqlNodeType.GE:
case SqlNodeType.GT:
case SqlNodeType.LE:
case SqlNodeType.LT:
case SqlNodeType.EQ:
case SqlNodeType.NE:
case SqlNodeType.EQ2V:
case SqlNodeType.NE2V:
case SqlNodeType.Concat:
SqlBinary firstNode = (SqlBinary)node1;
SqlBinary secondNode = (SqlBinary)node2;
return(AreEqual(firstNode.Left, secondNode.Left) &&
AreEqual(firstNode.Right, secondNode.Right));
case SqlNodeType.Convert:
case SqlNodeType.Treat: {
SqlUnary sun1 = (SqlUnary)node1;
SqlUnary sun2 = (SqlUnary)node2;
return(sun1.ClrType == sun2.ClrType && sun1.SqlType == sun2.SqlType && AreEqual(sun1.Operand, sun2.Operand));
}
case SqlNodeType.Between: {
SqlBetween b1 = (SqlBetween)node1;
SqlBetween b2 = (SqlBetween)node1;
return(AreEqual(b1.Expression, b2.Expression) &&
AreEqual(b1.Start, b2.Start) &&
AreEqual(b1.End, b2.End));
}
case SqlNodeType.Parameter:
return(node1 == node2);
case SqlNodeType.Alias:
return(AreEqual(((SqlAlias)node1).Node, ((SqlAlias)node2).Node));
case SqlNodeType.AliasRef:
return(AreEqual(((SqlAliasRef)node1).Alias, ((SqlAliasRef)node2).Alias));
case SqlNodeType.Column:
SqlColumn col1 = (SqlColumn)node1;
SqlColumn col2 = (SqlColumn)node2;
return(col1 == col2 || (col1.Expression != null && col2.Expression != null && AreEqual(col1.Expression, col2.Expression)));
case SqlNodeType.Table:
return(((SqlTable)node1).MetaTable == ((SqlTable)node2).MetaTable);
case SqlNodeType.Member:
return((((SqlMember)node1).Member == ((SqlMember)node2).Member) &&
AreEqual(((SqlMember)node1).Expression, ((SqlMember)node2).Expression));
case SqlNodeType.ColumnRef:
SqlColumnRef cref1 = (SqlColumnRef)node1;
SqlColumnRef cref2 = (SqlColumnRef)node2;
return(GetBaseColumn(cref1) == GetBaseColumn(cref2));
case SqlNodeType.Value:
return(Object.Equals(((SqlValue)node1).Value, ((SqlValue)node2).Value));
case SqlNodeType.TypeCase: {
SqlTypeCase c1 = (SqlTypeCase)node1;
SqlTypeCase c2 = (SqlTypeCase)node2;
if (!AreEqual(c1.Discriminator, c2.Discriminator))
{
return(false);
}
if (c1.Whens.Count != c2.Whens.Count)
{
return(false);
}
for (int i = 0, c = c1.Whens.Count; i < c; ++i)
{
if (!AreEqual(c1.Whens[i].Match, c2.Whens[i].Match))
{
return(false);
}
if (!AreEqual(c1.Whens[i].TypeBinding, c2.Whens[i].TypeBinding))
{
return(false);
}
}
return(true);
}
case SqlNodeType.SearchedCase: {
SqlSearchedCase c1 = (SqlSearchedCase)node1;
SqlSearchedCase c2 = (SqlSearchedCase)node2;
if (c1.Whens.Count != c2.Whens.Count)
{
return(false);
}
for (int i = 0, n = c1.Whens.Count; i < n; i++)
{
if (!AreEqual(c1.Whens[i].Match, c2.Whens[i].Match) ||
!AreEqual(c1.Whens[i].Value, c2.Whens[i].Value))
{
return(false);
}
}
return(AreEqual(c1.Else, c2.Else));
}
case SqlNodeType.ClientCase: {
SqlClientCase c1 = (SqlClientCase)node1;
SqlClientCase c2 = (SqlClientCase)node2;
if (c1.Whens.Count != c2.Whens.Count)
{
return(false);
}
for (int i = 0, n = c1.Whens.Count; i < n; i++)
{
if (!AreEqual(c1.Whens[i].Match, c2.Whens[i].Match) ||
!AreEqual(c1.Whens[i].Value, c2.Whens[i].Value))
{
return(false);
}
}
return(true);
}
case SqlNodeType.DiscriminatedType: {
SqlDiscriminatedType dt1 = (SqlDiscriminatedType)node1;
SqlDiscriminatedType dt2 = (SqlDiscriminatedType)node2;
return(AreEqual(dt1.Discriminator, dt2.Discriminator));
}
case SqlNodeType.SimpleCase: {
SqlSimpleCase c1 = (SqlSimpleCase)node1;
SqlSimpleCase c2 = (SqlSimpleCase)node2;
if (c1.Whens.Count != c2.Whens.Count)
{
return(false);
}
for (int i = 0, n = c1.Whens.Count; i < n; i++)
{
if (!AreEqual(c1.Whens[i].Match, c2.Whens[i].Match) ||
!AreEqual(c1.Whens[i].Value, c2.Whens[i].Value))
{
return(false);
}
}
return(true);
}
case SqlNodeType.Like: {
SqlLike like1 = (SqlLike)node1;
SqlLike like2 = (SqlLike)node2;
return(AreEqual(like1.Expression, like2.Expression) &&
AreEqual(like1.Pattern, like2.Pattern) &&
AreEqual(like1.Escape, like2.Escape));
}
case SqlNodeType.Variable: {
SqlVariable v1 = (SqlVariable)node1;
SqlVariable v2 = (SqlVariable)node2;
return(v1.Name == v2.Name);
}
case SqlNodeType.FunctionCall: {
SqlFunctionCall f1 = (SqlFunctionCall)node1;
SqlFunctionCall f2 = (SqlFunctionCall)node2;
if (f1.Name != f2.Name)
{
return(false);
}
if (f1.Arguments.Count != f2.Arguments.Count)
{
return(false);
}
for (int i = 0, n = f1.Arguments.Count; i < n; i++)
{
if (!AreEqual(f1.Arguments[i], f2.Arguments[i]))
{
return(false);
}
}
return(true);
}
case SqlNodeType.Link: {
SqlLink l1 = (SqlLink)node1;
SqlLink l2 = (SqlLink)node2;
if (!MetaPosition.AreSameMember(l1.Member.Member, l2.Member.Member))
{
return(false);
}
if (!AreEqual(l1.Expansion, l2.Expansion))
{
return(false);
}
if (l1.KeyExpressions.Count != l2.KeyExpressions.Count)
{
return(false);
}
for (int i = 0, c = l1.KeyExpressions.Count; i < c; ++i)
{
if (!AreEqual(l1.KeyExpressions[i], l2.KeyExpressions[i]))
{
return(false);
}
}
return(true);
}
case SqlNodeType.ExprSet:
SqlExprSet es1 = (SqlExprSet)node1;
SqlExprSet es2 = (SqlExprSet)node2;
if (es1.Expressions.Count != es2.Expressions.Count)
{
return(false);
}
for (int i = 0, n = es1.Expressions.Count; i < n; i++)
{
if (!AreEqual(es1.Expressions[i], es2.Expressions[i]))
{
return(false);
}
}
return(true);
case SqlNodeType.OptionalValue:
SqlOptionalValue ov1 = (SqlOptionalValue)node1;
SqlOptionalValue ov2 = (SqlOptionalValue)node2;
return(AreEqual(ov1.Value, ov2.Value));
case SqlNodeType.Row:
case SqlNodeType.UserQuery:
case SqlNodeType.StoredProcedureCall:
case SqlNodeType.UserRow:
case SqlNodeType.UserColumn:
case SqlNodeType.Multiset:
case SqlNodeType.ScalarSubSelect:
case SqlNodeType.Element:
case SqlNodeType.Exists:
case SqlNodeType.Join:
case SqlNodeType.Select:
case SqlNodeType.New:
case SqlNodeType.ClientQuery:
case SqlNodeType.ClientArray:
case SqlNodeType.Insert:
case SqlNodeType.Update:
case SqlNodeType.Delete:
case SqlNodeType.MemberAssign:
case SqlNodeType.Assign:
case SqlNodeType.Block:
case SqlNodeType.Union:
case SqlNodeType.DoNotVisit:
case SqlNodeType.MethodCall:
case SqlNodeType.Nop:
default:
return(false);
}
}
internal override SqlExpression VisitUnaryOperator(SqlUnary uo)
{
uo.Operand = this.VisitExpression(uo.Operand);
if (uo.NodeType != SqlNodeType.Convert)
{
return(uo);
}
ProviderType oldSqlType = uo.Operand.SqlType;
ProviderType newSqlType = uo.SqlType;
Type oldClrType = TypeSystem.GetNonNullableType(uo.Operand.ClrType);
Type newClrType = TypeSystem.GetNonNullableType(uo.ClrType);
if (newClrType == typeof(char))
{
if (oldClrType == typeof(bool))
{
throw Error.ConvertToCharFromBoolNotSupported();
}
if (oldSqlType.IsNumeric)
{
// numeric --> char
return(sql.FunctionCall(uo.ClrType, "NCHAR", new SqlExpression[] { uo.Operand }, uo.SourceExpression));
}
if (StringConversionIsSafe(oldSqlType, newSqlType))
{
if (StringConversionIsNeeded(oldSqlType, newSqlType))
{
// set the new size to the (potentially smaller) oldSqlType.Size
uo.SetSqlType(sql.TypeProvider.From(uo.ClrType, oldSqlType.HasSizeOrIsLarge ? oldSqlType.Size : (int?)null));
}
}
else
{
throw Error.UnsafeStringConversion(oldSqlType.ToQueryString(), newSqlType.ToQueryString());
}
}
else if (oldClrType == typeof(char) && (oldSqlType.IsChar || oldSqlType.IsString) && newSqlType.IsNumeric)
{
// char --> int
return(sql.FunctionCall(newClrType, sql.TypeProvider.From(typeof(int)), "UNICODE", new SqlExpression[] { uo.Operand }, uo.SourceExpression));
}
else if (newClrType == typeof(string))
{
if (oldClrType == typeof(double))
{
// use longer format if it was a double in the CLR expression
return(ConvertDoubleToString(uo.Operand, uo.ClrType));
}
else if (oldClrType == typeof(bool))
{
// use 'true' or 'false' if it was a bool in the CLR expression
return(ConvertBitToString(uo.Operand, uo.ClrType));
}
else if (StringConversionIsSafe(oldSqlType, newSqlType))
{
if (StringConversionIsNeeded(oldSqlType, newSqlType))
{
// set the new size to the (potentially smaller) oldSqlType.Size
uo.SetSqlType(sql.TypeProvider.From(uo.ClrType, oldSqlType.HasSizeOrIsLarge ? oldSqlType.Size : (int?)null));
}
}
else
{
throw Error.UnsafeStringConversion(oldSqlType.ToQueryString(), newSqlType.ToQueryString());
}
}
return(uo);
}
internal override SqlExpression VisitUnaryOperator(SqlUnary uo)
{
return(new SqlUnary(uo.NodeType, uo.ClrType, uo.SqlType, (SqlExpression)this.Visit(uo.Operand), uo.Method, uo.SourceExpression));
}
internal override SqlExpression VisitTreat(SqlUnary t)
{
return(new SqlUnary(SqlNodeType.Treat, t.ClrType, t.SqlType, (SqlExpression)this.Visit(t.Operand), t.SourceExpression));
}
internal override SqlExpression VisitUnaryOperator(SqlUnary uo) => new SqlUnary(uo.NodeType, uo.ClrType, uo.SqlType, (SqlExpression)Visit(uo.Operand), uo.Method, uo.SourceExpression);
