internal override SqlExpression VisitUnaryOperator(SqlUnary uo)
{
uo.Operand = VisitExpression(uo.Operand);
if (uo.NodeType == SqlNodeType.Convert)
{
IProviderType sqlType = uo.Operand.SqlType;
IProviderType newSqlType = uo.SqlType;
Type nonNullableType = TypeSystem.GetNonNullableType(uo.Operand.ClrType);
Type clrType = TypeSystem.GetNonNullableType(uo.ClrType);
if (clrType == typeof(char))
{
if (nonNullableType == typeof(bool))
{
throw Error.ConvertToCharFromBoolNotSupported();
}
if (sqlType.IsNumeric)
{
return(sql.FunctionCall(uo.ClrType, "NCHAR", new[] { uo.Operand }, uo.SourceExpression));
}
if (!StringConversionIsSafe(sqlType, newSqlType))
{
throw Error.UnsafeStringConversion(sqlType.ToQueryString(), newSqlType.ToQueryString());
}
if (StringConversionIsNeeded(sqlType, newSqlType))
{
uo.SetSqlType(sql.TypeProvider.From(uo.ClrType, sqlType.HasSizeOrIsLarge ? sqlType.Size : null));
}
return(uo);
}
if (((nonNullableType == typeof(char)) && (sqlType.IsChar || sqlType.IsString)) && newSqlType.IsNumeric)
{
//return sql.FunctionCall(clrType, sql.TypeProvider.From(typeof(int)), "UNICODE", new[] { uo.Operand }, uo.SourceExpression);
return(sql.UNICODE(clrType, uo));
}
if (clrType != typeof(string))
{
return(uo);
}
if (nonNullableType == typeof(double))
{
return(ConvertDoubleToString(uo.Operand, uo.ClrType));
}
if (nonNullableType == typeof(bool))
{
return(ConvertBitToString(uo.Operand, uo.ClrType));
}
if (!StringConversionIsSafe(sqlType, newSqlType))
{
throw Error.UnsafeStringConversion(sqlType.ToQueryString(), newSqlType.ToQueryString());
}
if (StringConversionIsNeeded(sqlType, newSqlType))
{
uo.SetSqlType(sql.TypeProvider.From(uo.ClrType, sqlType.HasSizeOrIsLarge ? sqlType.Size : null));
}
}
return(uo);
}
internal override SqlExpression VisitUnaryOperator(SqlUnary uo)
{
base.VisitUnaryOperator(uo);
if (((uo.NodeType != SqlNodeType.Convert) && (uo.Operand != null)) && (uo.Operand.SqlType != null))
{
uo.SetSqlType(typeProvider.PredictTypeForUnary(uo.NodeType, uo.Operand.SqlType));
}
return(uo);
}