public static String FormatCriteria(String fieldName, Object fieldValue,
Operators eO, Type sysType)
{
return FormatCriteria(fieldName, fieldValue, eO, "", sysType, ConnectionLibrary.SQlClient);
}
/// <summary>
/// 根据枚举值返回操作符
/// </summary>
/// <param name="op">枚举值</param>
/// <returns></returns>
public static string GetOperator(Operators op)
{
switch(op)
{
case Operators.gt:
{
return ">";
}
case Operators.lt:
{
return "<";
}
case Operators.eq:
{
return "=";
}
case Operators.le:
{
return "<=";
}
case Operators.ge:
{
return ">=";
}
case Operators.ne:
{
return "!=";
}
default:
{
return "";
}
}
}
public static String FormatCriteria(String fieldName, Object fieldValue, Operators eO, String tableName, Type sysType, ConnectionLibrary eCl)
{
String criteria = String.Empty;
String value;
String strOperator = AryOperator[Convert.ToInt32(eO)];
try
{
if (fieldName.Trim().Length > 0 && fieldValue != null)
{
if (eCl == ConnectionLibrary.SQlClient)
{
if (sysType == typeof(String))
{
value = fieldValue.ToString();
value = value.Replace("'", "''");
criteria = fieldName + strOperator + "'" + value + "'";
}
else if (sysType == typeof(DateTime))
{
value = fieldValue.ToString();
criteria = fieldName + strOperator + "'" + value + "'";
}
else if (sysType == typeof(Int16) || sysType == typeof(Int32)
|| sysType == typeof(Int64) || sysType == typeof(Decimal))
{
value = fieldValue.ToString();
criteria = fieldName + strOperator + value;
}
else if (sysType == typeof(DBNull))
{
value = "Null";
if (eO == Operators.Not)
{
criteria = fieldName + " is not " + value;
}
else
{
criteria = fieldName + " is " + value;
}
}
}
if (tableName.Trim().Length > 0)
{
criteria = tableName + "." + criteria;
}
}
else
{
if (fieldName.Trim().Length > 0)
{
throw new Exception("Field name is blank.");
}
if (fieldValue == null)
{
throw new Exception("Field value is Null.");
}
}
return criteria;
}
catch (Exception ex)
{
throw (ex);
}
}
public static String FormatCriteria(String fieldName, Object fieldValue,
Operators eO, String tablename)
{
return FormatCriteria(fieldName, fieldValue, eO, tablename, fieldValue.GetType(), ConnectionLibrary.SQlClient);
}
// CONSIDER: configure the scanner : local info
internal ExpressionNode Parse()
{
// free all nodes
_expression = null;
StartScan();
int cParens = 0;
OperatorInfo opInfo;
while (_token != Tokens.EOS)
{
loop:
Scan();
switch (_token)
{
case Tokens.EOS:
// End of string: must be operand; force out expression;
// check for bomb; check nothing left on stack.
if (_prevOperand == Empty)
{
if (_topNode == 0)
{
// we have an empty expression
break;
}
// set error missing operator
// read the last operator info
opInfo = _ops[_topOperator - 1];
throw ExprException.MissingOperand(opInfo);
}
// collect all nodes
BuildExpression(Operators.PriLow);
if (_topOperator != 1)
{
throw ExprException.MissingRightParen();
}
break;
case Tokens.Name:
case Tokens.Parent:
case Tokens.Numeric:
case Tokens.Decimal:
case Tokens.Float:
case Tokens.StringConst:
case Tokens.Date:
ExpressionNode?node = null;
string? str;
/* Constants and identifiers: create leaf node */
if (_prevOperand != Empty)
{
// set error missing operator
throw ExprException.MissingOperator(new string(_text, _start, _pos - _start));
}
if (_topOperator > 0)
{
// special check for IN without parentheses
opInfo = _ops[_topOperator - 1];
if (opInfo._type == Nodes.Binop && opInfo._op == Operators.In && _token != Tokens.Parent)
{
throw ExprException.InWithoutParentheses();
}
}
_prevOperand = Scalar;
switch (_token)
{
case Tokens.Parent:
string?relname;
string colname;
// parsing Parent[(relation_name)].column_name)
try
{
// expecting an '(' or '.'
Scan();
if (_token == Tokens.LeftParen)
{
//read the relation name
ScanToken(Tokens.Name);
relname = NameNode.ParseName(_text, _start, _pos);
ScanToken(Tokens.RightParen);
ScanToken(Tokens.Dot);
}
else
{
relname = null;
CheckToken(Tokens.Dot);
}
}
catch (Exception e) when(Common.ADP.IsCatchableExceptionType(e))
{
throw ExprException.LookupArgument();
}
ScanToken(Tokens.Name);
colname = NameNode.ParseName(_text, _start, _pos);
node = new LookupNode(_table, colname, relname);
break;
case Tokens.Name:
/* Qualify name now for nice error checking */
/* Create tree element - */
// CONSIDER: Check for reserved proc names here
node = new NameNode(_table, _text, _start, _pos);
break;
case Tokens.Numeric:
str = new string(_text, _start, _pos - _start);
node = new ConstNode(_table, ValueType.Numeric, str);
break;
case Tokens.Decimal:
str = new string(_text, _start, _pos - _start);
node = new ConstNode(_table, ValueType.Decimal, str);
break;
case Tokens.Float:
str = new string(_text, _start, _pos - _start);
node = new ConstNode(_table, ValueType.Float, str);
break;
case Tokens.StringConst:
Debug.Assert(_text[_start] == '\'' && _text[_pos - 1] == '\'', "The expression contains an invalid string constant");
Debug.Assert(_pos - _start > 1, "The expression contains an invalid string constant");
// Store string without quotes..
str = new string(_text, _start + 1, _pos - _start - 2);
node = new ConstNode(_table, ValueType.Str, str);
break;
case Tokens.Date:
Debug.Assert(_text[_start] == '#' && _text[_pos - 1] == '#', "The expression contains invalid date constant.");
Debug.Assert(_pos - _start > 2, "The expression contains invalid date constant '{0}'.");
// Store date without delimiters(#s)..
str = new string(_text, _start + 1, _pos - _start - 2);
node = new ConstNode(_table, ValueType.Date, str);
break;
default:
Debug.Fail("unhandled token");
break;
}
NodePush(node);
goto loop;
case Tokens.LeftParen:
cParens++;
if (_prevOperand == Empty)
{
// Check for ( following IN/IFF. if not, we have a normal (.
// Peek: take a look at the operators stack
Debug.Assert(_topOperator > 0, "Empty operator stack!!");
opInfo = _ops[_topOperator - 1];
if (opInfo._type == Nodes.Binop && opInfo._op == Operators.In)
{
/* IN - handle as procedure call */
node = new FunctionNode(_table, "In");
NodePush(node);
/* Push operator decriptor */
_ops[_topOperator++] = new OperatorInfo(Nodes.Call, Operators.Noop, Operators.PriParen);
}
else
{ /* Normal ( */
/* Push operator decriptor */
_ops[_topOperator++] = new OperatorInfo(Nodes.Paren, Operators.Noop, Operators.PriParen);
}
}
else
{
// This is a procedure call or () qualification
// Force out any dot qualifiers; check for bomb
BuildExpression(Operators.PriProc);
_prevOperand = Empty;
ExpressionNode?nodebefore = NodePeek();
if (nodebefore == null || nodebefore.GetType() != typeof(NameNode))
{
// this is more like an assert, so we not care about "nice" exception text..
throw ExprException.SyntaxError();
}
/* Get the proc name */
NameNode name = (NameNode)NodePop();
// Make sure that we can bind the name as a Function
// then get the argument count and types, and parse arguments..
node = new FunctionNode(_table, name._name);
// check to see if this is an aggregate function
Aggregate agg = (Aggregate)(int)((FunctionNode)node).Aggregate;
if (agg != Aggregate.None)
{
node = ParseAggregateArgument((FunctionId)(int)agg);
NodePush(node);
_prevOperand = Expr;
goto loop;
}
NodePush(node);
_ops[_topOperator++] = new OperatorInfo(Nodes.Call, Operators.Noop, Operators.PriParen);
}
goto loop;
case Tokens.RightParen:
{
/* Right parentheses: Build expression if we have an operand. */
if (_prevOperand != Empty)
{
BuildExpression(Operators.PriLow);
}
/* We must have Tokens.LeftParen on stack. If no operand, must be procedure call. */
if (_topOperator <= 1)
{
// set error, syntax: too many right parens..
throw ExprException.TooManyRightParentheses();
}
Debug.Assert(_topOperator > 1, "melformed operator stack.");
_topOperator--;
opInfo = _ops[_topOperator];
if (_prevOperand == Empty && opInfo._type != Nodes.Call)
{
// set error, syntax: missing operand.
throw ExprException.MissingOperand(opInfo);
}
Debug.Assert(opInfo._priority == Operators.PriParen, "melformed operator stack.");
if (opInfo._type == Nodes.Call)
{
/* add argument to the function call. */
if (_prevOperand != Empty)
{
// read last function argument
ExpressionNode argument = NodePop();
/* Get the procedure name and append argument */
Debug.Assert(_topNode > 0 && NodePeek() !.GetType() == typeof(FunctionNode), "The function node should be created on '('");
FunctionNode func = (FunctionNode)NodePop();
func.AddArgument(argument);
func.Check();
NodePush(func);
}
}
else
{
/* Normal parentheses: create tree node */
// Construct & Put the Nodes.Paren node on node stack
node = NodePop();
node = new UnaryNode(_table, Operators.Noop, node);
NodePush(node);
}
_prevOperand = Expr;
cParens--;
goto loop;
}
case Tokens.ListSeparator:
{
/* Comma encountered: Must be operand; force out subexpression */
if (_prevOperand == Empty)
{
throw ExprException.MissingOperandBefore(",");
}
/* We are be in a procedure call */
/* build next argument */
BuildExpression(Operators.PriLow);
opInfo = _ops[_topOperator - 1];
if (opInfo._type != Nodes.Call)
{
throw ExprException.SyntaxError();
}
ExpressionNode argument2 = NodePop();
/* Get the procedure name */
FunctionNode func = (FunctionNode)NodePop();
func.AddArgument(argument2);
NodePush(func);
_prevOperand = Empty;
goto loop;
}
case Tokens.BinaryOp:
if (_prevOperand == Empty)
{
/* Check for unary plus/minus */
if (_op == Operators.Plus)
{
_op = Operators.UnaryPlus;
// fall through to UnaryOperator;
}
else if (_op == Operators.Minus)
{
/* Unary minus */
_op = Operators.Negative;
// fall through to UnaryOperator;
}
else
{
// Error missing operand:
throw ExprException.MissingOperandBefore(Operators.ToString(_op));
}
}
else
{
_prevOperand = Empty;
/* CNSIDER: If we are going to support BETWEEN Translate AND to special BetweenAnd if it is. */
/* Force out to appropriate precedence; push operator. */
BuildExpression(Operators.Priority(_op));
// PushOperator descriptor
_ops[_topOperator++] = new OperatorInfo(Nodes.Binop, _op, Operators.Priority(_op));
goto loop;
}
goto
case Tokens.UnaryOp; // fall through to UnaryOperator;
case Tokens.UnaryOp:
/* Must be no operand. Push it. */
_ops[_topOperator++] = new OperatorInfo(Nodes.Unop, _op, Operators.Priority(_op));
goto loop;
case Tokens.ZeroOp:
// check the we have operator on the stack
if (_prevOperand != Empty)
{
// set error missing operator
throw ExprException.MissingOperator(new string(_text, _start, _pos - _start));
}
// PushOperator descriptor
_ops[_topOperator++] = new OperatorInfo(Nodes.Zop, _op, Operators.PriMax);
_prevOperand = Expr;
goto loop;
case Tokens.Dot:
//if there is a name on the stack append it.
ExpressionNode?before = NodePeek();
if (before != null && before.GetType() == typeof(NameNode))
{
Scan();
if (_token == Tokens.Name)
{
NameNode nameBefore = (NameNode)NodePop();
string newName = nameBefore._name + "." + NameNode.ParseName(_text, _start, _pos);
NodePush(new NameNode(_table, newName));
goto loop;
}
}
// fall through to default
goto default;
default:
throw ExprException.UnknownToken(new string(_text, _start, _pos - _start), _start + 1);
}
}
goto end_loop;
end_loop:
Debug.Assert(_topNode == 1 || _topNode == 0, "Invalid Node Stack");
_expression = _nodeStack[0];
return(_expression);
}
public static String FormatCriteria(String fieldName, Object fieldValue,
Operators eO, ConnectionLibrary eCl)
{
return FormatCriteria(fieldName, fieldValue, eO, "", fieldValue.GetType(), eCl);
}
/// <summary>
/// ����ȽϿؼ�
/// </summary>
/// <param name="dc"></param>
/// <param name="notNull"></param>
/// <param name="op"></param>
protected void AddDataControl(IDataControl dc, bool notNull, Operators op)
{
//m_dataControlGroup.Add(dc);
m_ht.Add(dc, op);
dc.NotNull = notNull;
}
private object EvalBinaryOp(int op, ExpressionNode left, ExpressionNode right, DataRow row, DataRowVersion version, int[] recordNos)
{
object vLeft;
object vRight;
bool isLConst, isRConst;
Type result;
/*
* special case for OR and AND operators: we don't want to evaluate
* both right and left operands, because we can shortcut :
* for OR operator If one of the operands is true the result is true
* for AND operator If one of rhe operands is flase the result is false
* CONSIDER : in the shortcut case do we want to type-check the other operand?
*/
if (op != Operators.Or && op != Operators.And && op != Operators.In && op != Operators.Is && op != Operators.IsNot)
{
vLeft = BinaryNode.Eval(left, row, version, recordNos);
vRight = BinaryNode.Eval(right, row, version, recordNos);
isLConst = (left is ConstNode);
isRConst = (right is ConstNode);
// special case of handling NULLS, currently only OR operator can work with NULLS
if ((vLeft == DBNull.Value) || (vRight == DBNull.Value))
{
return(DBNull.Value);
}
result = ResultType(vLeft.GetType(), vRight.GetType(), isLConst, isRConst, op);
if (result == null)
{
SetTypeMismatchError(op, vLeft.GetType(), vRight.GetType());
}
#if DEBUG
if (CompModSwitches.BinaryNode.TraceVerbose)
{
Debug.WriteLine("Result of the operator: " + result.Name);
}
#endif
}
else
{
vLeft = vRight = DBNull.Value;
result = null;
}
object value = DBNull.Value;
bool typeMismatch = false;
try {
switch (op)
{
case Operators.Plus:
if (result == typeof(Byte))
{
value = Convert.ToByte(Convert.ToByte(vLeft) + Convert.ToByte(vRight));
}
else if (result == typeof(SByte))
{
value = Convert.ToSByte(Convert.ToSByte(vLeft) + Convert.ToSByte(vRight));
}
else if (result == typeof(Int16))
{
value = Convert.ToInt16(Convert.ToInt16(vLeft) + Convert.ToInt16(vRight));
}
else if (result == typeof(UInt16))
{
value = Convert.ToUInt16(Convert.ToUInt16(vLeft) + Convert.ToUInt16(vRight));
}
else if (result == typeof(Int32))
{
Int32 a = Convert.ToInt32(vLeft);
Int32 b = Convert.ToInt32(vRight);
checked { value = a + b; }
}
else if (result == typeof(UInt32))
{
UInt32 a = Convert.ToUInt32(vLeft);
UInt32 b = Convert.ToUInt32(vRight);
checked { value = a + b; }
}
else if (result == typeof(UInt64))
{
UInt64 a = Convert.ToUInt64(vLeft);
UInt64 b = Convert.ToUInt64(vRight);
checked { value = a + b; }
}
else if (result == typeof(Int64))
{
Int64 a = Convert.ToInt64(vLeft);
Int64 b = Convert.ToInt64(vRight);
checked { value = a + b; }
}
else if (result == typeof(Decimal))
{
Decimal a = Convert.ToDecimal(vLeft);
Decimal b = Convert.ToDecimal(vRight);
checked { value = a + b; }
}
else if (result == typeof(Single))
{
Single a = Convert.ToSingle(vLeft);
Single b = Convert.ToSingle(vRight);
checked { value = a + b; }
}
else if (result == typeof(double))
{
Double a = Convert.ToDouble(vLeft);
Double b = Convert.ToDouble(vRight);
checked { value = a + b; }
}
else if (result == typeof(string) || result == typeof(char))
{
value = Convert.ToString(vLeft) + Convert.ToString(vRight);
}
else if (result == typeof(DateTime))
{
// one of the operands should be a DateTime, and an other a TimeSpan
if (vLeft is TimeSpan && vRight is DateTime)
{
value = (DateTime)vRight + (TimeSpan)vLeft;
}
else if (vLeft is DateTime && vRight is TimeSpan)
{
value = (DateTime)vLeft + (TimeSpan)vRight;
}
else
{
typeMismatch = true;
}
}
else if (result == typeof(TimeSpan))
{
value = (TimeSpan)vLeft + (TimeSpan)vRight;
}
else
{
typeMismatch = true;
}
break;
case Operators.Minus:
if (result == typeof(Byte))
{
value = Convert.ToByte(Convert.ToByte(vLeft) - Convert.ToByte(vRight));
}
else if (result == typeof(SByte))
{
value = Convert.ToSByte(Convert.ToSByte(vLeft) - Convert.ToSByte(vRight));
}
else if (result == typeof(Int16))
{
value = Convert.ToInt16(Convert.ToInt16(vLeft) - Convert.ToInt16(vRight));
}
else if (result == typeof(UInt16))
{
value = Convert.ToUInt16(Convert.ToUInt16(vLeft) - Convert.ToUInt16(vRight));
}
else if (result == typeof(Int32))
{
Int32 a = Convert.ToInt32(vLeft);
Int32 b = Convert.ToInt32(vRight);
checked { value = a - b; }
}
else if (result == typeof(UInt32))
{
UInt32 a = Convert.ToUInt32(vLeft);
UInt32 b = Convert.ToUInt32(vRight);
checked { value = a - b; }
}
else if (result == typeof(Int64))
{
Int64 a = Convert.ToInt64(vLeft);
Int64 b = Convert.ToInt64(vRight);
checked { value = a - b; }
}
else if (result == typeof(UInt64))
{
UInt64 a = Convert.ToUInt64(vLeft);
UInt64 b = Convert.ToUInt64(vRight);
checked { value = a - b; }
}
else if (result == typeof(Decimal))
{
Decimal a = Convert.ToDecimal(vLeft);
Decimal b = Convert.ToDecimal(vRight);
checked { value = a - b; }
}
else if (result == typeof(Single))
{
Single a = Convert.ToSingle(vLeft);
Single b = Convert.ToSingle(vRight);
checked { value = a - b; }
}
else if (result == typeof(double))
{
Double a = Convert.ToDouble(vLeft);
Double b = Convert.ToDouble(vRight);
checked { value = a - b; }
}
else if (result == typeof(DateTime))
{
value = (DateTime)vLeft - (TimeSpan)vRight;
}
else if (result == typeof(TimeSpan))
{
if (vLeft is DateTime)
{
value = (DateTime)vLeft - (DateTime)vRight;
}
else
{
value = (TimeSpan)vLeft - (TimeSpan)vRight;
}
}
else
{
typeMismatch = true;
}
break;
case Operators.Multiply:
if (result == typeof(Byte))
{
value = Convert.ToByte(Convert.ToByte(vLeft) * Convert.ToByte(vRight));
}
else if (result == typeof(SByte))
{
value = Convert.ToSByte(Convert.ToSByte(vLeft) * Convert.ToSByte(vRight));
}
else if (result == typeof(Int16))
{
value = Convert.ToInt16(Convert.ToInt16(vLeft) * Convert.ToInt16(vRight));
}
else if (result == typeof(UInt16))
{
value = Convert.ToUInt16(Convert.ToUInt16(vLeft) * Convert.ToUInt16(vRight));
}
else if (result == typeof(Int32))
{
Int32 a = Convert.ToInt32(vLeft);
Int32 b = Convert.ToInt32(vRight);
checked { value = a * b; }
}
else if (result == typeof(UInt32))
{
UInt32 a = Convert.ToUInt32(vLeft);
UInt32 b = Convert.ToUInt32(vRight);
checked { value = a * b; }
}
else if (result == typeof(Int64))
{
Int64 a = Convert.ToInt64(vLeft);
Int64 b = Convert.ToInt64(vRight);
checked { value = a * b; }
}
else if (result == typeof(UInt64))
{
UInt64 a = Convert.ToUInt64(vLeft);
UInt64 b = Convert.ToUInt64(vRight);
checked { value = a * b; }
}
else if (result == typeof(Decimal))
{
Decimal a = Convert.ToDecimal(vLeft);
Decimal b = Convert.ToDecimal(vRight);
checked { value = a * b; }
}
else if (result == typeof(Single))
{
Single a = Convert.ToSingle(vLeft);
Single b = Convert.ToSingle(vRight);
checked { value = a * b; }
}
else if (result == typeof(double))
{
Double a = Convert.ToDouble(vLeft);
Double b = Convert.ToDouble(vRight);
checked { value = a * b; }
}
else
{
typeMismatch = true;
}
break;
case Operators.Divide:
if (result == typeof(Byte))
{
value = Convert.ToByte(Convert.ToByte(vLeft) / Convert.ToByte(vRight));
}
else if (result == typeof(SByte))
{
value = Convert.ToSByte(Convert.ToSByte(vLeft) / Convert.ToSByte(vRight));
}
else if (result == typeof(Int16))
{
value = Convert.ToInt16(Convert.ToInt16(vLeft) / Convert.ToInt16(vRight));
}
else if (result == typeof(UInt16))
{
value = Convert.ToUInt16(Convert.ToUInt16(vLeft) / Convert.ToUInt16(vRight));
}
else if (result == typeof(Int32))
{
Int32 a = Convert.ToInt32(vLeft);
Int32 b = Convert.ToInt32(vRight);
checked { value = a / b; }
}
else if (result == typeof(UInt32))
{
UInt32 a = Convert.ToUInt32(vLeft);
UInt32 b = Convert.ToUInt32(vRight);
checked { value = a / b; }
}
else if (result == typeof(UInt64))
{
UInt64 a = Convert.ToUInt64(vLeft);
UInt64 b = Convert.ToUInt64(vRight);
checked { value = a / b; }
}
else if (result == typeof(Int64))
{
Int64 a = Convert.ToInt64(vLeft);
Int64 b = Convert.ToInt64(vRight);
checked { value = a / b; }
}
else if (result == typeof(Decimal))
{
Decimal a = Convert.ToDecimal(vLeft);
Decimal b = Convert.ToDecimal(vRight);
checked { value = a / b; }
}
else if (result == typeof(Single))
{
Single a = Convert.ToSingle(vLeft);
Single b = Convert.ToSingle(vRight);
checked { value = a / b; }
}
else if (result == typeof(double))
{
Double a = Convert.ToDouble(vLeft);
Double b = Convert.ToDouble(vRight);
checked { value = a / b; }
}
else
{
typeMismatch = true;
}
break;
case Operators.EqualTo:
if ((vLeft == DBNull.Value) || (vRight == DBNull.Value))
{
return(DBNull.Value);
}
return(0 == Compare(vLeft, vRight, result, Operators.EqualTo));
case Operators.GreaterThen:
if ((vLeft == DBNull.Value) || (vRight == DBNull.Value))
{
return(DBNull.Value);
}
return(0 < Compare(vLeft, vRight, result, op));
case Operators.LessThen:
if ((vLeft == DBNull.Value) || (vRight == DBNull.Value))
{
return(DBNull.Value);
}
return(0 > Compare(vLeft, vRight, result, op));
case Operators.GreaterOrEqual:
if ((vLeft == DBNull.Value) || (vRight == DBNull.Value))
{
return(DBNull.Value);
}
return(0 <= Compare(vLeft, vRight, result, op));
case Operators.LessOrEqual:
if ((vLeft == DBNull.Value) || (vRight == DBNull.Value))
{
return(DBNull.Value);
}
return(0 >= Compare(vLeft, vRight, result, op));
case Operators.NotEqual:
if ((vLeft == DBNull.Value) || (vRight == DBNull.Value))
{
return(DBNull.Value);
}
return(0 != Compare(vLeft, vRight, result, op));
case Operators.Is:
vLeft = BinaryNode.Eval(left, row, version, recordNos);
if (vLeft == DBNull.Value)
{
return(true);
}
return(false);
case Operators.IsNot:
vLeft = BinaryNode.Eval(left, row, version, recordNos);
if (vLeft == DBNull.Value)
{
return(false);
}
return(true);
case Operators.And:
/*
* special case evaluating of the AND operator: we don't want to evaluate
* both right and left operands, because we can shortcut :
* If one of the operands is flase the result is false
* CONSIDER : in the shortcut case do we want to type-check the other operand?
*/
vLeft = BinaryNode.Eval(left, row, version, recordNos);
if (vLeft == DBNull.Value)
{
return(DBNull.Value);
}
if (!(vLeft is bool))
{
vRight = BinaryNode.Eval(right, row, version, recordNos);
typeMismatch = true;
break;
}
if ((bool)vLeft == false)
{
value = false;
break;
}
vRight = BinaryNode.Eval(right, row, version, recordNos);
if (vRight == DBNull.Value)
{
return(DBNull.Value);
}
if (!(vRight is bool))
{
typeMismatch = true;
break;
}
value = (bool)vRight;
break;
case Operators.Or:
/*
* special case evaluating the OR operator: we don't want to evaluate
* both right and left operands, because we can shortcut :
* If one of the operands is true the result is true
* CONSIDER : in the shortcut case do we want to type-check the other operand?
*/
vLeft = BinaryNode.Eval(left, row, version, recordNos);
if (vLeft != DBNull.Value)
{
if (!(vLeft is bool))
{
vRight = BinaryNode.Eval(right, row, version, recordNos);
typeMismatch = true;
break;
}
if ((bool)vLeft == true)
{
value = true;
break;
}
}
vRight = BinaryNode.Eval(right, row, version, recordNos);
if (vRight == DBNull.Value)
{
return(vLeft);
}
if (vLeft == DBNull.Value)
{
return(vRight);
}
if (!(vRight is bool))
{
typeMismatch = true;
break;
}
value = (bool)vRight;
break;
case Operators.Modulo:
if (ExpressionNode.IsInteger(result))
{
if (result == typeof(UInt64))
{
value = Convert.ToUInt64(vLeft) % Convert.ToUInt64(vRight);
}
else
{
value = Convert.ToInt64(vLeft) % Convert.ToInt64(vRight);
value = Convert.ChangeType(value, result);
}
}
else
{
typeMismatch = true;
}
break;
case Operators.In:
/*
* special case evaluating of the IN operator: the right have to be IN function node
*/
#if DEBUG
if (CompModSwitches.BinaryNode.TraceVerbose)
{
Debug.WriteLine("Evaluating IN operator..");
}
#endif
if (!(right is FunctionNode))
{
// this is more like an Assert: should never happens, so we do not care about "nice" Exseptions
throw ExprException.InWithoutParentheses();
}
vLeft = BinaryNode.Eval(left, row, version, recordNos);
if (vLeft == DBNull.Value)
{
return(DBNull.Value);
}
/* validate IN parameters : must all be constant expressions */
value = false;
FunctionNode into = (FunctionNode)right;
for (int i = 0; i < into.argumentCount; i++)
{
vRight = into.arguments[i].Eval();
#if DEBUG
if (CompModSwitches.BinaryNode.TraceVerbose)
{
Debug.WriteLine("Evaluate IN parameter " + into.arguments[i].ToString() + " = " + vRight.ToString());
}
#endif
if (vRight == DBNull.Value)
{
continue;
}
Debug.Assert((vLeft != DBNull.Value) && (vRight != DBNull.Value), "Imposible..");
result = vLeft.GetType();
if (0 == Compare(vLeft, vRight, result, Operators.EqualTo))
{
value = true;
break;
}
}
break;
default:
#if DEBUG
if (CompModSwitches.BinaryNode.TraceVerbose)
{
Debug.WriteLine("NYI : " + Operators.ToString(op));
}
#endif
throw ExprException.UnsupportedOperator(op);
}
}
catch (OverflowException) {
throw ExprException.Overflow(result);
}
if (typeMismatch)
{
SetTypeMismatchError(op, vLeft.GetType(), vRight.GetType());
}
return(value);
}
public override string ToString()
{
string str = left.ToString() + " " + Operators.ToString(op) + " " + right.ToString();
return(str);
}
internal Type ResultType(Type left, Type right, bool lc, bool rc, int op)
{
if ((left == typeof(System.Guid)) && (right == typeof(System.Guid)) && Operators.IsRelational(op))
{
return(left);
}
if ((left == typeof(System.String)) && (right == typeof(System.Guid)) && Operators.IsRelational(op))
{
return(left);
}
if ((left == typeof(System.Guid)) && (right == typeof(System.String)) && Operators.IsRelational(op))
{
return(right);
}
int leftPrecedence = (int)GetPrecedence(left);
if (leftPrecedence == (int)DataTypePrecedence.Error)
{
return(null);
}
int rightPrecedence = (int)GetPrecedence(right);
if (rightPrecedence == (int)DataTypePrecedence.Error)
{
return(null);
}
if (Operators.IsLogical(op))
{
if (left == typeof(Boolean) && right == typeof(Boolean))
{
return(typeof(Boolean));
}
else
{
return(null);
}
}
if ((op == Operators.Plus) && ((left == typeof(String)) || (right == typeof(String))))
{
return(typeof(string));
}
DataTypePrecedence higherPrec = (DataTypePrecedence)Math.Max(leftPrecedence, rightPrecedence);
Type result = GetType(higherPrec);
if (Operators.IsArithmetical(op))
{
if (result != typeof(string) && result != typeof(char))
{
if (!IsNumeric(left))
{
return(null);
}
if (!IsNumeric(right))
{
return(null);
}
}
}
// if the operation is a division the result should be at least a double
if ((op == Operators.Divide) && IsInteger(result))
{
return(typeof(double));
}
if (IsMixed(left, right))
{
// we are dealing with one signed and one unsigned type so
// try to see if one of them is a ConstNode
if (lc && (!rc))
{
return(right);
}
else if ((!lc) && rc)
{
return(left);
}
if (IsUnsigned(result))
{
if (higherPrec < DataTypePrecedence.UInt64)
{
// left and right are mixed integers but with the same length
// so promote to the next signed type
result = GetType(higherPrec + 1);
}
else
{
throw ExprException.AmbiguousBinop(op, left, right);
}
}
}
return(result);
}
/// <summary>
/// Построить выражение
/// </summary>
/// <param name="op">Оператор</param>
/// <param name="fieldRef">Поле</param>
/// <param name="o">Значение</param>
/// <returns></returns>
protected CriteriaOperator BuildQueryExpression(Operators op, OperandProperty fieldRef, DateTime o)
{
if (op == Operators.NotEqual)
{
return new BinaryOperator(new FunctionOperator(FunctionOperatorType.GetDate, fieldRef), new OperandValue(o), BinaryOperatorType.NotEqual);
}
else if (op.Binary)
{
return new GroupOperator(op.Or ? GroupOperatorType.Or : GroupOperatorType.And,
new BinaryOperator(new FunctionOperator(FunctionOperatorType.GetDate, fieldRef), new OperandValue(o), op.GetOperators()[0]),
new BinaryOperator(new FunctionOperator(FunctionOperatorType.GetDate, fieldRef), new OperandValue(o), op.GetOperators()[1])
);
}
else
{
return new BinaryOperator(new FunctionOperator(FunctionOperatorType.GetDate, fieldRef), new OperandValue(o), op.GetOperators()[0]);
}
}
