internal override SqlExpression VisitFunctionCall(SqlFunctionCall fc) {
// process the arguments
SqlExpression result = base.VisitFunctionCall(fc);
if (result is SqlFunctionCall) {
SqlFunctionCall resultFunctionCall = (SqlFunctionCall)result;
if (resultFunctionCall.Name == "LEN") {
SqlExpression expr = resultFunctionCall.Arguments[0];
if (expr.SqlType.IsLargeType && !expr.SqlType.SupportsLength) {
result = sql.DATALENGTH(expr);
if (expr.SqlType.IsUnicodeType) {
result = sql.ConvertToInt(sql.Divide(result, sql.ValueFromObject(2, expr.SourceExpression)));
}
}
}
// If the return type of the sql function is not compatible with
// the expected CLR type of the function, inject a conversion. This
// step must be performed AFTER SqlRetyper has run.
Type clrType = resultFunctionCall.SqlType.GetClosestRuntimeType();
bool skipConversion = SqlMethodTransformer.SkipConversionForDateAdd(resultFunctionCall.Name,
resultFunctionCall.ClrType,
clrType);
if ((resultFunctionCall.ClrType != clrType) && !skipConversion) {
result = sql.ConvertTo(resultFunctionCall.ClrType, resultFunctionCall);
}
}
return result;
}
internal override SqlExpression VisitFunctionCall(SqlFunctionCall fc) {
for (int i = 0, n = fc.Arguments.Count; i < n; i++) {
fc.Arguments[i] = this.FetchExpression(fc.Arguments[i]);
}
return fc;
}
internal override SqlExpression VisitFunctionCall(SqlFunctionCall fc) {
if (fc.Name == "LEN") {
bool changed;
fc.Arguments[0] = ConvertToMax(fc.Arguments[0],out changed);
if (fc.Arguments[0].SqlType.IsLargeType) {
this.annotations.Add(fc, new SqlServerCompatibilityAnnotation(
Strings.LenOfTextOrNTextNotSupported(fc.SourceExpression), SqlProvider.ProviderMode.Sql2000));
}
}
return base.VisitFunctionCall(fc);
}
internal virtual SqlExpression VisitFunctionCall(SqlFunctionCall fc) {
for (int i = 0, n = fc.Arguments.Count; i < n; i++) {
fc.Arguments[i] = this.VisitExpression(fc.Arguments[i]);
}
return fc;
}
internal override SqlExpression DATEPART(string partName, SqlExpression expr)
{
var args = new[] { expr };
var s = expr.SourceExpression;
SqlExpression arg;
IProviderType sqlType = null;
Type clrType = typeof(int);
sqlType = TypeProvider.From(typeof(string));
switch (partName.ToUpper())
{
case "HOUR":
arg = ValueFromObject("HH24", true, s);
break;
case "MINUTE":
arg = ValueFromObject("MI", true, s);
break;
case "SECOND":
arg = ValueFromObject("SS", true, s);
break;
case "DAY":
args = new[] { VariableFromName("DAY FROM", s), expr };
return(new SqlFunctionCall(clrType, sqlType, "EXTRACT", args, s)
{
Comma = false
});
case "MONTH":
args = new[] { VariableFromName("MONTH FROM", s), expr };
return(new SqlFunctionCall(clrType, sqlType, "EXTRACT", args, s)
{
Comma = false
});
case "YEAR":
args = new[] { VariableFromName("YEAR FROM", s), expr };
return(new SqlFunctionCall(clrType, sqlType, "EXTRACT", args, s)
{
Comma = false
});
case "DAYOFWEEK":
clrType = typeof(DayOfWeek);
sqlType = TypeProvider.From(typeof(int));
arg = ValueFromObject("D", true, s);
var func = new SqlFunctionCall(clrType, sqlType, "TO_CHAR", new[] { expr, arg }, s);
return(new SqlBinary(SqlNodeType.Sub, clrType, sqlType, func, ValueFromObject(1, s)));
case "DAYOFYEAR":
arg = ValueFromObject("DDD", true, s);
break;
case "TIMEOFDAY":
arg = ValueFromObject("DDD", true, s);
break;
default:
throw SqlClient.Error.MethodHasNoSupportConversionToSql(partName);
}
return(new SqlFunctionCall(clrType, sqlType, "TO_CHAR", new[] { expr, arg }, s));
}
internal abstract ProviderType ReturnTypeOfFunction(SqlFunctionCall functionCall);
/// <inheritdoc/>
public override void Visit(SqlFunctionCall node)
{
switch (node.FunctionType)
{
case SqlFunctionType.Truncate:
var argument = node.Arguments[0];
SqlDml.FunctionCall("TRUNCATE", argument, SqlDml.Literal(0)).AcceptVisitor(this);
return;
case SqlFunctionType.Concat:
var exprs = new SqlExpression[node.Arguments.Count];
node.Arguments.CopyTo(exprs, 0);
Visit(SqlDml.Concat(exprs));
return;
case SqlFunctionType.CharLength:
SqlDml.FunctionCall(translator.Translate(SqlFunctionType.CharLength), node.Arguments[0]).AcceptVisitor(this);
// SqlDml.CharLength(node.Arguments[0]).AcceptVisitor(this);
return;
case SqlFunctionType.PadLeft:
case SqlFunctionType.PadRight:
SqlHelper.GenericPad(node).AcceptVisitor(this);
return;
case SqlFunctionType.Rand:
SqlDml.FunctionCall(translator.Translate(SqlFunctionType.Rand)).AcceptVisitor(this);
return;
case SqlFunctionType.Square:
SqlDml.Power(node.Arguments[0], 2).AcceptVisitor(this);
return;
case SqlFunctionType.IntervalToMilliseconds:
Visit(CastToLong(node.Arguments[0]) / NanosecondsPerMillisecond);
return;
case SqlFunctionType.IntervalConstruct:
case SqlFunctionType.IntervalToNanoseconds:
Visit(CastToLong(node.Arguments[0]));
return;
case SqlFunctionType.DateTimeAddMonths:
Visit(DateAddMonth(node.Arguments[0], node.Arguments[1]));
return;
case SqlFunctionType.DateTimeAddYears:
Visit(DateAddYear(node.Arguments[0], node.Arguments[1]));
return;
case SqlFunctionType.DateTimeConstruct:
Visit(DateAddDay(DateAddMonth(DateAddYear(SqlDml.Literal(new DateTime(2001, 1, 1)),
node.Arguments[0] - 2001),
node.Arguments[1] - 1),
node.Arguments[2] - 1));
return;
case SqlFunctionType.DateTimeToStringIso:
Visit(DateTimeToStringIso(node.Arguments[0]));
return;
}
base.Visit(node);
}
internal override SqlExpression VisitFunctionCall(SqlFunctionCall fc) {
if (fc.Name.Contains(".")) {
// Assume UDF -- bracket the name.
this.WriteName(fc.Name);
} else {
// No ".", so we assume it's a system function name and leave it alone.
sb.Append(fc.Name);
}
sb.Append("(");
for (int i = 0, n = fc.Arguments.Count; i < n; i++) {
if (i > 0)
sb.Append(", ");
this.Visit(fc.Arguments[i]);
}
sb.Append(")");
return fc;
}
internal static bool AreEqual(SqlNode node1, SqlNode node2)
{
if (node1 == node2)
{
return(true);
}
if ((node1 != null) && (node2 != null))
{
if (node1.NodeType == SqlNodeType.SimpleCase)
{
node1 = UnwrapTrivialCaseExpression((SqlSimpleCase)node1);
}
if (node2.NodeType == SqlNodeType.SimpleCase)
{
node2 = UnwrapTrivialCaseExpression((SqlSimpleCase)node2);
}
if (node1.NodeType != node2.NodeType)
{
if (node1.NodeType == SqlNodeType.ExprSet)
{
SqlExprSet set = (SqlExprSet)node1;
int num = 0;
int count = set.Expressions.Count;
while (num < count)
{
if (AreEqual(set.Expressions[num], node2))
{
return(true);
}
num++;
}
}
else if (node2.NodeType == SqlNodeType.ExprSet)
{
SqlExprSet set2 = (SqlExprSet)node2;
int num3 = 0;
int num4 = set2.Expressions.Count;
while (num3 < num4)
{
if (AreEqual(node1, set2.Expressions[num3]))
{
return(true);
}
num3++;
}
}
return(false);
}
if (node1.Equals(node2))
{
return(true);
}
switch (node1.NodeType)
{
case SqlNodeType.Add:
case SqlNodeType.And:
case SqlNodeType.BitAnd:
case SqlNodeType.BitOr:
case SqlNodeType.BitXor:
case SqlNodeType.Concat:
case SqlNodeType.Div:
case SqlNodeType.EQ:
case SqlNodeType.EQ2V:
case SqlNodeType.LE:
case SqlNodeType.LT:
case SqlNodeType.GE:
case SqlNodeType.GT:
case SqlNodeType.Mod:
case SqlNodeType.Mul:
case SqlNodeType.NE:
case SqlNodeType.NE2V:
case SqlNodeType.Or:
case SqlNodeType.Sub:
{
SqlBinary binary = (SqlBinary)node1;
SqlBinary binary2 = (SqlBinary)node2;
if (!AreEqual(binary.Left, binary2.Left))
{
return(false);
}
return(AreEqual(binary.Right, binary2.Right));
}
case SqlNodeType.Alias:
return(AreEqual(((SqlAlias)node1).Node, ((SqlAlias)node2).Node));
case SqlNodeType.AliasRef:
return(AreEqual(((SqlAliasRef)node1).Alias, ((SqlAliasRef)node2).Alias));
case SqlNodeType.Avg:
case SqlNodeType.BitNot:
case SqlNodeType.ClrLength:
case SqlNodeType.Count:
case SqlNodeType.Covar:
case SqlNodeType.IsNotNull:
case SqlNodeType.IsNull:
case SqlNodeType.Max:
case SqlNodeType.Min:
case SqlNodeType.Negate:
case SqlNodeType.Not:
case SqlNodeType.Not2V:
case SqlNodeType.OuterJoinedValue:
case SqlNodeType.Stddev:
case SqlNodeType.Sum:
case SqlNodeType.ValueOf:
return(AreEqual(((SqlUnary)node1).Operand, ((SqlUnary)node2).Operand));
case SqlNodeType.Between:
{
SqlBetween between = (SqlBetween)node1;
SqlBetween between2 = (SqlBetween)node1;
if (!AreEqual(between.Expression, between2.Expression) ||
!AreEqual(between.Start, between2.Start))
{
return(false);
}
return(AreEqual(between.End, between2.End));
}
case SqlNodeType.Cast:
case SqlNodeType.Convert:
case SqlNodeType.Treat:
{
SqlUnary unary = (SqlUnary)node1;
SqlUnary unary2 = (SqlUnary)node2;
if ((unary.ClrType != unary2.ClrType) || !(unary.SqlType == unary2.SqlType))
{
return(false);
}
return(AreEqual(unary.Operand, unary2.Operand));
}
case SqlNodeType.ClientCase:
{
SqlClientCase case5 = (SqlClientCase)node1;
SqlClientCase case6 = (SqlClientCase)node2;
if (case5.Whens.Count == case6.Whens.Count)
{
int num9 = 0;
int num10 = case5.Whens.Count;
while (num9 < num10)
{
if (!AreEqual(case5.Whens[num9].Match, case6.Whens[num9].Match) ||
!AreEqual(case5.Whens[num9].Value, case6.Whens[num9].Value))
{
return(false);
}
num9++;
}
return(true);
}
return(false);
}
case SqlNodeType.Column:
{
SqlColumn column = (SqlColumn)node1;
SqlColumn column2 = (SqlColumn)node2;
return((column == column2) ||
(((column.Expression != null) && (column2.Expression != null)) &&
AreEqual(column.Expression, column2.Expression)));
}
case SqlNodeType.ColumnRef:
{
SqlColumnRef cref = (SqlColumnRef)node1;
SqlColumnRef ref3 = (SqlColumnRef)node2;
return(GetBaseColumn(cref) == GetBaseColumn(ref3));
}
case SqlNodeType.DiscriminatedType:
{
SqlDiscriminatedType type = (SqlDiscriminatedType)node1;
SqlDiscriminatedType type2 = (SqlDiscriminatedType)node2;
return(AreEqual(type.Discriminator, type2.Discriminator));
}
case SqlNodeType.ExprSet:
{
SqlExprSet set3 = (SqlExprSet)node1;
SqlExprSet set4 = (SqlExprSet)node2;
if (set3.Expressions.Count == set4.Expressions.Count)
{
int num17 = 0;
int num18 = set3.Expressions.Count;
while (num17 < num18)
{
if (!AreEqual(set3.Expressions[num17], set4.Expressions[num17]))
{
return(false);
}
num17++;
}
return(true);
}
return(false);
}
case SqlNodeType.FunctionCall:
{
SqlFunctionCall call = (SqlFunctionCall)node1;
SqlFunctionCall call2 = (SqlFunctionCall)node2;
if (!(call.Name != call2.Name))
{
if (call.Arguments.Count != call2.Arguments.Count)
{
return(false);
}
int num13 = 0;
int num14 = call.Arguments.Count;
while (num13 < num14)
{
if (!AreEqual(call.Arguments[num13], call2.Arguments[num13]))
{
return(false);
}
num13++;
}
return(true);
}
return(false);
}
case SqlNodeType.Link:
{
SqlLink link = (SqlLink)node1;
SqlLink link2 = (SqlLink)node2;
if (MetaPosition.AreSameMember(link.Member.Member, link2.Member.Member))
{
if (!AreEqual(link.Expansion, link2.Expansion))
{
return(false);
}
if (link.KeyExpressions.Count != link2.KeyExpressions.Count)
{
return(false);
}
int num15 = 0;
int num16 = link.KeyExpressions.Count;
while (num15 < num16)
{
if (!AreEqual(link.KeyExpressions[num15], link2.KeyExpressions[num15]))
{
return(false);
}
num15++;
}
return(true);
}
return(false);
}
case SqlNodeType.Like:
{
SqlLike like = (SqlLike)node1;
SqlLike like2 = (SqlLike)node2;
if (!AreEqual(like.Expression, like2.Expression) || !AreEqual(like.Pattern, like2.Pattern))
{
return(false);
}
return(AreEqual(like.Escape, like2.Escape));
}
case SqlNodeType.Member:
if (((SqlMember)node1).Member != ((SqlMember)node2).Member)
{
return(false);
}
return(AreEqual(((SqlMember)node1).Expression, ((SqlMember)node2).Expression));
case SqlNodeType.OptionalValue:
{
SqlOptionalValue value2 = (SqlOptionalValue)node1;
SqlOptionalValue value3 = (SqlOptionalValue)node2;
return(AreEqual(value2.Value, value3.Value));
}
case SqlNodeType.Parameter:
return(node1 == node2);
case SqlNodeType.SearchedCase:
{
SqlSearchedCase case3 = (SqlSearchedCase)node1;
SqlSearchedCase case4 = (SqlSearchedCase)node2;
if (case3.Whens.Count == case4.Whens.Count)
{
int num7 = 0;
int num8 = case3.Whens.Count;
while (num7 < num8)
{
if (!AreEqual(case3.Whens[num7].Match, case4.Whens[num7].Match) ||
!AreEqual(case3.Whens[num7].Value, case4.Whens[num7].Value))
{
return(false);
}
num7++;
}
return(AreEqual(case3.Else, case4.Else));
}
return(false);
}
case SqlNodeType.SimpleCase:
{
SqlSimpleCase case7 = (SqlSimpleCase)node1;
SqlSimpleCase case8 = (SqlSimpleCase)node2;
if (case7.Whens.Count == case8.Whens.Count)
{
int num11 = 0;
int num12 = case7.Whens.Count;
while (num11 < num12)
{
if (!AreEqual(case7.Whens[num11].Match, case8.Whens[num11].Match) ||
!AreEqual(case7.Whens[num11].Value, case8.Whens[num11].Value))
{
return(false);
}
num11++;
}
return(true);
}
return(false);
}
case SqlNodeType.Table:
return(((SqlTable)node1).MetaTable == ((SqlTable)node2).MetaTable);
case SqlNodeType.TypeCase:
{
SqlTypeCase @case = (SqlTypeCase)node1;
SqlTypeCase case2 = (SqlTypeCase)node2;
if (AreEqual(@case.Discriminator, case2.Discriminator))
{
if (@case.Whens.Count != case2.Whens.Count)
{
return(false);
}
int num5 = 0;
int num6 = @case.Whens.Count;
while (num5 < num6)
{
if (!AreEqual(@case.Whens[num5].Match, case2.Whens[num5].Match))
{
return(false);
}
if (!AreEqual(@case.Whens[num5].TypeBinding, case2.Whens[num5].TypeBinding))
{
return(false);
}
num5++;
}
return(true);
}
return(false);
}
case SqlNodeType.Variable:
{
SqlVariable variable = (SqlVariable)node1;
SqlVariable variable2 = (SqlVariable)node2;
return(variable.Name == variable2.Name);
}
case SqlNodeType.Value:
return(object.Equals(((SqlValue)node1).Value, ((SqlValue)node2).Value));
}
}
return(false);
}
//取消函数括号，即Limit(int,int) -> Limit int, int
internal override SqlExpression VisitFunctionCall(SqlFunctionCall fc)
{
switch (fc.Name)
{
case "Limit":
{
Debug.Assert(fc.Arguments.Count == 2);
bool limited = false;
if (!(fc.Arguments[0] is SqlValue) || (int)((SqlValue)fc.Arguments[0]).Value > 0)
{
sb.Append("LIMIT ");
this.Visit(fc.Arguments[0]);
sb.Append(" ");
limited = true;
}
if (!(fc.Arguments[1] is SqlValue) || (int)((SqlValue)fc.Arguments[1]).Value > 0)
{
if (!limited)
{
sb.Append("LIMIT 18446744073709551615 ");
}
sb.Append("OFFSET ");
this.Visit(fc.Arguments[1]);
}
return(fc);
}
//case "DATE_FORMAT":
// sb.Append("CAST(");
// var result = base.VisitFunctionCall(fc);
// sb.Append(" AS SIGNED)");
// return result;
//case "Date":
// sb.Append("Date(");
// Visit(fc.Arguments[0]);
// sb.Append(")");
// return fc;
case "AddDays":
case "AddHours":
case "AddMinutes":
case "AddMonths":
case "AddSeconds":
case "AddYears":
sb.Append("DATE_ADD(");
Visit(fc.Arguments[0]);
sb.Append(", INTERVAL ");
Visit(fc.Arguments[1]);
sb.Append(" ");
sb.Append(((SqlValue)fc.Arguments[2]).Value);
sb.Append(")");
return(fc);
//case "AddHours":
// sb.Append("DATE_ADD(");
// Visit(fc.Arguments[0]);
// sb.Append(", INTERVAL ");
// Visit(fc.Arguments[1]);
// sb.Append(" DAY)");
// return fc;
}
return(base.VisitFunctionCall(fc));
}
protected virtual SqlExpression VisitFunction(SqlFunctionCall expr)
{
return expr;
}
public override void Visit(SqlFunctionCall node)
{
switch (node.FunctionType)
{
case SqlFunctionType.PadLeft:
case SqlFunctionType.PadRight:
SqlHelper.GenericPad(node).AcceptVisitor(this);
return;
case SqlFunctionType.DateTimeOffsetAddYears:
case SqlFunctionType.DateTimeAddYears:
DateTimeAddComponent(node.Arguments[0], node.Arguments[1], true).AcceptVisitor(this);
return;
case SqlFunctionType.DateTimeOffsetAddMonths:
case SqlFunctionType.DateTimeAddMonths:
DateTimeAddComponent(node.Arguments[0], node.Arguments[1], false).AcceptVisitor(this);
return;
case SqlFunctionType.IntervalConstruct:
IntervalConstruct(node.Arguments[0]).AcceptVisitor(this);
return;
case SqlFunctionType.DateTimeConstruct:
DateTimeConstruct(node.Arguments[0], node.Arguments[1], node.Arguments[2]).AcceptVisitor(this);
return;
case SqlFunctionType.IntervalAbs:
SqlHelper.IntervalAbs(node.Arguments[0]).AcceptVisitor(this);
return;
case SqlFunctionType.IntervalToMilliseconds:
SqlHelper.IntervalToMilliseconds(node.Arguments[0]).AcceptVisitor(this);
return;
case SqlFunctionType.IntervalToNanoseconds:
SqlHelper.IntervalToNanoseconds(node.Arguments[0]).AcceptVisitor(this);
return;
case SqlFunctionType.Position:
Position(node.Arguments[0], node.Arguments[1]).AcceptVisitor(this);
return;
case SqlFunctionType.CharLength:
SqlDml.Coalesce(SqlDml.FunctionCall("LENGTH", node.Arguments[0]), 0).AcceptVisitor(this);
return;
case SqlFunctionType.DateTimeToStringIso:
DateTimeToStringIso(node.Arguments[0]).AcceptVisitor(this);
return;
case SqlFunctionType.DateTimeOffsetConstruct:
DateTimeOffsetConstruct(node.Arguments[0], node.Arguments[1]).AcceptVisitor(this);
return;
case SqlFunctionType.DateTimeOffsetTimeOfDay:
DateTimeOffsetTimeOfDay(node.Arguments[0]).AcceptVisitor(this);
return;
case SqlFunctionType.DateTimeOffsetToLocalTime:
DateTimeOffsetToLocalTime(node.Arguments[0]).AcceptVisitor(this);
return;
case SqlFunctionType.DateTimeToDateTimeOffset:
DateTimeToDateTimeOffset(node.Arguments[0]).AcceptVisitor(this);
return;
case SqlFunctionType.DateTimeOffsetToUtcTime:
DateTimeOffsetToUtcTime(node.Arguments[0]).AcceptVisitor(this);
return;
default:
base.Visit(node);
return;
}
}
internal override SqlExpression VisitFunctionCall(SqlFunctionCall fc)
{
switch (fc.Name)
{
case "SkipTake":
{
Debug.Assert(fc.Arguments.Count == 2);
var skip = (int)((SqlValue)fc.Arguments[0]).Value;
var take = (int)((SqlValue)fc.Arguments[1]).Value;
var str = string.Empty;
if (take >= 0)
{
sb.Append("FIRST ");
sb.Append(take);
str = " ";
}
if (skip >= 0)
{
sb.Append(str);
sb.Append("SKIP ");
sb.Append(skip);
}
return(fc);
}
case "LEN":
case "DATALENGTH":
sb.Append("OCTET_LENGTH( ");
Visit(fc.Arguments[0]);
sb.Append(" ) ");
return(fc);
case "TrimEnd":
sb.Append("TRIM( TRAILING From ");
Visit(fc.Arguments[0]);
sb.Append(" )");
return(fc);
case "TrimStart":
sb.Append("TRIM( LEADING From ");
Visit(fc.Arguments[0]);
sb.Append(" )");
return(fc);
case "SUBSTRING":
sb.Append("SUBSTRING( ");
Visit(fc.Arguments[0]);
sb.Append(" FROM ");
Visit(fc.Arguments[1]);
if (fc.Arguments.Count > 2)
{
sb.Append(" FOR ");
Visit(fc.Arguments[2]);
}
sb.Append(")");
return(fc);
case "Date":
sb.Append("CAST (");
Visit(fc.Arguments[0]);
sb.Append(" AS DATE)");
return(fc);
}
//if (fc.Name.StartsWith("GEN_ID"))
//{
// sb.Append(fc.Name);
// sb.Append(" FROM RDB$DATABASE");
// return fc;
//}
return(base.VisitFunctionCall(fc));
}
protected override SqlExpression VisitFunction(SqlFunctionCall expr)
{
if (expr.Name.Contains("."))
WriteName(expr.Name);
else
_builder.Append(expr.Name);
_builder.Append("(");
for (int i = 0; i < expr.Arguments.Expressions.Count; ++i)
{
if (i > 0)
_builder.Append(", ");
Visit(expr.Arguments.Expressions[i]);
}
_builder.Append(")");
return expr;
}
internal override ProviderType ReturnTypeOfFunction(SqlFunctionCall functionCall)
{
var argumentTypes = this.GetArgumentTypes(functionCall);
SqlType arg0 = (SqlType)argumentTypes[0];
SqlType arg1 = argumentTypes.Length > 1 ? (SqlType)argumentTypes[1] : (SqlType)null;
switch (functionCall.Name)
{
case "LEN":
case "DATALENGTH":
switch (arg0.SqlDbType)
{
case SqlDbType.NVarChar:
case SqlDbType.VarChar:
case SqlDbType.VarBinary:
if (arg0.IsLargeType)
{
return(SqlTypeSystem.Create(SqlDbType.BigInt));
}
else
{
return(SqlTypeSystem.Create(SqlDbType.Int));
}
default:
return(SqlTypeSystem.Create(SqlDbType.Int));
}
case "ABS":
case "SIGN":
case "ROUND":
case "CEILING":
case "FLOOR":
case "POWER":
switch (arg0.SqlDbType)
{
case SqlDbType.TinyInt:
case SqlDbType.Int:
case SqlDbType.SmallInt:
return(SqlTypeSystem.Create(SqlDbType.Int));
case SqlDbType.Float:
case SqlDbType.Real:
return(SqlTypeSystem.Create(SqlDbType.Float));
default:
return(arg0);
}
case "PATINDEX":
case "CHARINDEX":
if (arg1.IsLargeType)
{
return(SqlTypeSystem.Create(SqlDbType.BigInt));
}
return(SqlTypeSystem.Create(SqlDbType.Int));
case "SUBSTRING":
if (functionCall.Arguments[2].NodeType == SqlNodeType.Value)
{
SqlValue val = (SqlValue)functionCall.Arguments[2];
if (val.Value is int)
{
switch (arg0.SqlDbType)
{
case SqlDbType.NVarChar:
case SqlDbType.NChar:
case SqlDbType.VarChar:
case SqlDbType.Char:
return(SqlTypeSystem.Create(arg0.SqlDbType, (int)val.Value));
default:
return(null);
}
}
}
switch (arg0.SqlDbType)
{
case SqlDbType.NVarChar:
case SqlDbType.NChar:
return(SqlTypeSystem.Create(SqlDbType.NVarChar));
case SqlDbType.VarChar:
case SqlDbType.Char:
return(SqlTypeSystem.Create(SqlDbType.VarChar));
default:
return(null);
}
case "STUFF":
// if the stuff call is an insertion and is strictly additive
// (no deletion of characters) the return type is the same as
// a concatenation
if (functionCall.Arguments.Count == 4)
{
SqlValue delLength = functionCall.Arguments[2] as SqlValue;
if (delLength != null && (int)delLength.Value == 0)
{
return(PredictTypeForBinary(SqlNodeType.Concat,
functionCall.Arguments[0].SqlType, functionCall.Arguments[3].SqlType));
}
}
return(null);
case "LOWER":
case "UPPER":
case "RTRIM":
case "LTRIM":
case "INSERT":
case "REPLACE":
case "LEFT":
case "RIGHT":
case "REVERSE":
return(arg0);
default:
return(null);
}
}
internal override SqlExpression VisitFunctionCall(SqlFunctionCall fc) {
SqlExpression[] args = new SqlExpression[fc.Arguments.Count];
for (int i = 0, n = fc.Arguments.Count; i < n; i++) {
args[i] = this.VisitExpression(fc.Arguments[i]);
}
return new SqlFunctionCall(fc.ClrType, fc.SqlType, fc.Name, args, fc.SourceExpression);
}
/// <inheritdoc/>
public override void Visit(SqlFunctionCall node)
{
switch (node.FunctionType)
{
case SqlFunctionType.CharLength:
(SqlDml.FunctionCall("DATALENGTH", node.Arguments) / 2).AcceptVisitor(this);
return;
case SqlFunctionType.PadLeft:
case SqlFunctionType.PadRight:
GenericPad(node).AcceptVisitor(this);
return;
case SqlFunctionType.Round:
// Round should always be called with 2 arguments
if (node.Arguments.Count == 1)
{
Visit(SqlDml.FunctionCall(
translator.Translate(SqlFunctionType.Round),
node.Arguments[0],
SqlDml.Literal(0)));
return;
}
break;
case SqlFunctionType.Truncate:
// Truncate is implemented as round(arg, 0, 1) call in MSSQL.
// It's stupid, isn't it?
Visit(SqlDml.FunctionCall(
translator.Translate(SqlFunctionType.Round),
node.Arguments[0],
SqlDml.Literal(0),
SqlDml.Literal(1)));
return;
case SqlFunctionType.Substring:
if (node.Arguments.Count == 2)
{
node = SqlDml.Substring(node.Arguments[0], node.Arguments[1]);
SqlExpression len = SqlDml.CharLength(node.Arguments[0]);
node.Arguments.Add(len);
Visit(node);
return;
}
break;
case SqlFunctionType.IntervalToMilliseconds:
Visit(CastToLong(node.Arguments[0]) / NanosecondsPerMillisecond);
return;
case SqlFunctionType.IntervalConstruct:
case SqlFunctionType.IntervalToNanoseconds:
Visit(CastToLong(node.Arguments[0]));
return;
case SqlFunctionType.DateTimeAddMonths:
Visit(DateAddMonth(node.Arguments[0], node.Arguments[1]));
return;
case SqlFunctionType.DateTimeAddYears:
Visit(DateAddYear(node.Arguments[0], node.Arguments[1]));
return;
case SqlFunctionType.DateTimeTruncate:
DateTimeTruncate(node.Arguments[0]).AcceptVisitor(this);
return;
case SqlFunctionType.DateTimeConstruct:
Visit(DateAddDay(DateAddMonth(DateAddYear(SqlDml.Literal(new DateTime(2001, 1, 1)),
node.Arguments[0] - 2001),
node.Arguments[1] - 1),
node.Arguments[2] - 1));
return;
case SqlFunctionType.DateTimeToStringIso:
Visit(DateTimeToStringIso(node.Arguments[0]));
return;
}
base.Visit(node);
}
internal override SqlExpression VisitFunctionCall(SqlFunctionCall fc) {
for (int i = 0, n = fc.Arguments.Count; i < n; i++) {
fc.Arguments[i] = this.VisitExpression(fc.Arguments[i]);
}
if (fc.Arguments.Count > 0) {
ProviderType oldType = fc.Arguments[0].SqlType;
// if this has a real argument (not e.g. the symbol "DAY" in DATEDIFF(DAY,...))
if (oldType != null) {
ProviderType newType = this.typeProvider.ReturnTypeOfFunction(fc);
if (newType != null) {
fc.SetSqlType(newType);
}
}
}
return fc;
}
protected override SqlNode VisitMethodCall(MethodCallExpression mc)
{
//´¦Àí×Ö·û´®º¯Êý¡£
if (mc.Object != null && mc.Object.Type == typeof(string))
{
switch (mc.Method.Name)
{
case "Trim":
{
var clrType = mc.Method.ReturnType;
var expressions = new[] { VisitExpression(mc.Object) };
var node = new SqlFunctionCall(clrType, typeProvider.From(clrType), "Trim", expressions,
dominatingExpression);
return(node);
}
case "TrimStart":
{
var clrType = mc.Method.ReturnType;
var expressions = new[] { VisitExpression(mc.Object) };
var node = new SqlFunctionCall(clrType, typeProvider.From(clrType), "LTrim", expressions,
dominatingExpression);
return(node);
}
case "TrimEnd":
{
var clrType = mc.Method.ReturnType;
var expressions = new[] { VisitExpression(mc.Object) };
var node = new SqlFunctionCall(clrType, typeProvider.From(clrType), "RTrim", expressions,
dominatingExpression);
return(node);
}
case "Remove":
{
var clrType = mc.Method.ReturnType;
Debug.Assert(clrType == typeof(string));
var startIndex = (int)((ConstantExpression)mc.Arguments[0]).Value;
var arg1 = VisitExpression(mc.Object);
var arg2 = VisitExpression(Expression.Constant(1));
var arg3 = VisitExpression(Expression.Constant(startIndex));
var left = new SqlFunctionCall(typeof(string), typeProvider.From(typeof(string)), "SUBSTR",
new[] { arg1, arg2, arg3 }, dominatingExpression);
if (mc.Arguments.Count == 2)
{
var count = (int)((ConstantExpression)mc.Arguments[1]).Value;
arg2 = VisitExpression(Expression.Constant(startIndex + count));
SqlExpression right = new SqlFunctionCall(typeof(string), typeProvider.From(typeof(string)),
"SUBSTR", new[] { arg1, arg2 }, dominatingExpression);
var result = new SqlBinary(SqlNodeType.Add, clrType, typeProvider.From(clrType), left, right);
return(result);
}
Debug.Assert(mc.Arguments.Count == 1);
return(left);
}
case "Replace":
{
var clrType = mc.Method.ReturnType;
var sqlType = typeProvider.From(clrType);
Debug.Assert(clrType == typeof(string));
Debug.Assert(mc.Arguments.Count == 2);
var sourceObject = VisitExpression(mc.Object);
var oldValue = VisitExpression(mc.Arguments[0]);
var newValue = VisitExpression(mc.Arguments[1]);
var result = new SqlFunctionCall(clrType, sqlType, "Replace",
new[] { sourceObject, oldValue, newValue }, dominatingExpression);
return(result);
}
default:
return(base.VisitMethodCall(mc));
}
}
return(base.VisitMethodCall(mc));
}