public override bool CanCastTo(SqlType destType)
{
return(destType is StringType || destType is DateType || destType is NullType);
}
public void SimpleGeometryWithNoContext()
{
const string typeString = "GEOMETRY";
Assert.Throws <NotSupportedException>(() => SqlType.Parse(typeString));
}
public StringType(SqlType sqlType, int maxSize)
: base("STRING", sqlType)
{
AssertIsString(sqlType);
MaxSize = maxSize;
}
public override bool IsComparable(SqlType type)
{
return(type is DateType || type is NullType);
}
public BinaryType(SqlType sqlType, int maxSize)
: base("BINARY", sqlType)
{
MaxSize = maxSize;
AssertIsBinary(sqlType);
}
public StringType(SqlType sqlType)
: this(sqlType, -1)
{
}
public override ISqlObject CastTo(ISqlObject value, SqlType destType)
{
return(SqlNull.Value);
}
public BinaryType(SqlType sqlType)
: this(sqlType, -1)
{
}
public override bool IsComparable(SqlType type)
{
// NULL can be compared to any type, since any type is NULLABLE on SQL
return(true);
}
public override bool CanCastTo(SqlType destType)
{
return(true);
}
public static void SerializeTo(BinaryWriter writer, SqlType type)
{
writer.Write((byte)type.TypeCode);
if (type.IsPrimitive)
{
if (type is NumericType)
{
var numericType = (NumericType)type;
writer.Write(numericType.Precision);
writer.Write(numericType.Scale);
}
else if (type is StringType)
{
var stringType = (StringType)type;
writer.Write(stringType.MaxSize);
if (stringType.Locale != null)
{
writer.Write((byte)1);
writer.Write(stringType.Locale.Name);
}
else
{
writer.Write((byte)0);
}
}
else if (type is BinaryType)
{
var binaryType = (BinaryType)type;
writer.Write(binaryType.MaxSize);
}
else if (type is BooleanType ||
type is IntervalType ||
type is DateType ||
type is NullType)
{
// nothing to add to the SQL Type Code
}
else
{
throw new NotSupportedException(String.Format("The data type '{0}' cannot be serialized.", type.GetType().FullName));
}
}
else if (type is UserType)
{
var userType = (UserType)type;
writer.Write((byte)1); // The code of custom type
writer.Write(userType.FullName.FullName);
}
else if (type is QueryType)
{
// nothing to do for the Query Type here
}
else if (type is ArrayType)
{
var arrayType = (ArrayType)type;
writer.Write(arrayType.Length);
}
else
{
throw new NotSupportedException();
}
}
public NumericType(SqlType sqlType, int size)
: this(sqlType, size, 0)
{
}
public NumericType(SqlType sqlType)
: this(sqlType, -1)
{
}
public NumericType(SqlType sqlType, int size, byte scale)
: base("NUMERIC", sqlType)
{
Size = size;
Scale = scale;
}
public override DataType Wider(DataType otherType)
{
SqlType t1SqlType = SqlType;
SqlType t2SqlType = otherType.SqlType;
if (t1SqlType == SqlType.Decimal)
{
return(this);
}
if (t2SqlType == SqlType.Decimal)
{
return(otherType);
}
if (t1SqlType == SqlType.Numeric)
{
return(this);
}
if (t2SqlType == SqlType.Numeric)
{
return(otherType);
}
if (t1SqlType == SqlType.Bit)
{
return(otherType); // It can't be any smaller than a Bit
}
if (t2SqlType == SqlType.Bit)
{
return(this);
}
int t1IntSize = GetIntSize(t1SqlType);
int t2IntSize = GetIntSize(t2SqlType);
if (t1IntSize > 0 && t2IntSize > 0)
{
// Both are int types, use the largest size
return((t1IntSize > t2IntSize) ? this : otherType);
}
int t1FloatSize = GetFloatSize(t1SqlType);
int t2FloatSize = GetFloatSize(t2SqlType);
if (t1FloatSize > 0 && t2FloatSize > 0)
{
// Both are floating types, use the largest size
return((t1FloatSize > t2FloatSize) ? this : otherType);
}
if (t1FloatSize > t2IntSize)
{
return(this);
}
if (t2FloatSize > t1IntSize)
{
return(otherType);
}
if (t1IntSize >= t2FloatSize || t2IntSize >= t1FloatSize)
{
// Must be a long (8 bytes) and a real (4 bytes), widen to a double
return(new NumericType(SqlType.Double, 8, 0));
}
// NOTREACHED - can't get here, the last three if statements cover
// all possibilities.
throw new ApplicationException("Widest type error.");
}
