Query SQLite database for a GUID in the form X'3D98F71F3CD9415BA978C010b1CEF941 - ios

Question

I have an iOS project and data is written into an SQLite Database. For example, 'OBJECTROWID' in a table LDOCLINK stores info about a linked document.
OBJECTROWID starts of as a string with the format <3d98f71f 3cd9415b a978c010 b1cef941> but is cast to (NSData *) before being input into the database. The actual handling of the database insertion was written by a much more experienced programmer than myself. Anyway, as the image below shows, the database displays the OBJECTROWID column in the form X'3D98F71F3CD9415BA978C010b1CEF941'. I am a complete beginner with SQLite queries and cannot seem to return the correct row by using the WHERE clause with OBJECTROWID = or OBJECTROWID like.
SELECT * FROM LDOCLINK WHERE OBJECTROWID like '%';
gives all the rows (obviously) but I want the row where OBJECTROWID equals <3d98f71f 3cd9415b a978c010 b1cef941>. I have tried the following and none of them work:
SELECT * FROM LDOCLINK WHERE OBJECTROWID = 'X''3d98f71f3cd9415ba978c010b1cef941' no error - I thought that I was escaping the single quote that appears after the X but this didn't work
SELECT * FROM LDOCLINK WHERE OBJECTROWID like '%<3d98f71f 3cd9415b a978c010 b1cef941>%'
I cannot even get a match for two adjacent characters such as the initial 3D:
SELECT * FROM LDOCLINK WHERE OBJECTROWID like '%3d%' no error reported but it doesn't return anything.
SELECT * FROM LDOCLINK WHERE OBJECTROWID like '%d%' This is the strangest result as it returns ONLY the two rows that DON'T include my <3d98f71f 3cd9415b a978c010 b1cef941>, seemingly arbitrarily.
SELECT * FROM LDOCLINK WHERE OBJECTTYPE = '0' returns these same rows, just to illustrate that the interface works (SQLite Manager).
I also checked out this question and this one but I still could not get the correct query.
Please help me to return the correct row (actually two rows in this case - the first and third).
EDIT:
The code to write to database involves many classes. The method shown below is I think the main part of serialisation (case 8).
-(void)serializeValue:(NSObject*)value ToBuffer:(NSMutableData*)buffer
{
switch (self.propertyTypeID) {
case 0:
{
SInt32 length = 0;
if ( (NSString*)value )
{
/*
NSData* data = [((NSString*)value) dataUsingEncoding:NSUnicodeStringEncoding];
// first 2 bytes are unicode prefix
length = data.length - 2;
[buffer appendBytes:&length length:sizeof(SInt32)];
if ( length > 0 )
[buffer appendBytes:([data bytes]+2) length:length];
*/
NSData* data = [((NSString*)value) dataUsingEncoding:NSUTF8StringEncoding];
length = data.length;
[buffer appendBytes:&length length:sizeof(SInt32)];
if ( length > 0 )
[buffer appendBytes:([data bytes]) length:length];
}
else
[buffer appendBytes:&length length:sizeof(SInt32)];
}
break;
//depends on the realisation of DB serialisation
case 1:
{
Byte b = 0;
if ( (NSNumber*)value )
b = [(NSNumber*)value boolValue] ? 1 : 0;
[buffer appendBytes:&b length:1];
}
break;
//........
case 8:
{
int length = 16;
[buffer appendBytes:[(NSData*)value bytes] length:length];
}
break;
default:
break;
}
}

Answer 1

So, as pointed out by Tom Kerr, this post answered my question. Almost. The syntax wasn't exactly right. The form: SELECT * FROM LDOCLINK WHERE OBJECTROWID.Id = X'a8828ddfef224d36935a1c66ae86ebb3'; was suggested but I actually had to drop the .Id part.
Making:
SELECT * FROM LDOCLINK WHERE OBJECTROWID = X'3d98f71f3cd9415ba978c010b1cef941';