Try using the attached hex.c function. You'll need to compile this as a .so and
call sqlite3_create_function to register it.
Hth
Mau Liste <[EMAIL PROTECTED]> wrote: Hello all,
I am trying to print some table values in hexadecimal.
I've seen in the docs that there is a function called 'hex'
but the following:
create table aa (a integer);
insert into aa values(10);
insert into aa values(11);
insert into aa values(12);
insert into aa values(13);
insert into aa values(14);
insert into aa values(15);
select hex(a) from aa;
results in: SQL error: no such function: hex
while:
select min(a) from aa;
results in the correct answer: 10
I've seen in the source code that the function hex does indeed exist and
it is inserted into the built in function table together with the min
and a load of other functions.
Before digging more into the sources, can you tell me if I am doing
something stupid and how the function hex may be used?
Or at least if it is possible to print hexadecimal values at all.
Thanks all.
Mau.
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/*
** The toHexFunc returns a string of Hexidicimal values using
** a leading Prefix of 0x .
** To install use
** sqlite3_create_function(db,"to_hex",1, SQLITE_ANY,0,tohexFunc,0,0);
** Library must be compiled without SQLITE_OMIT_LOAD_EXTENSION defined
*/
static void tohexFunc(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
int i, n;
static const char hexdigits[] = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'A', 'B', 'C', 'D', 'E', 'F' };
const unsigned char *pBlob;
sqlite_int64 d64;
char *zHex;
char *z = 0;
/* Kll, extend to include optional width */
switch( sqlite3_value_type(argv[0]) ) {
case SQLITE_NULL:
case SQLITE_FLOAT: return; break;
case SQLITE_INTEGER: {
d64 = sqlite3_value_int64(argv[0]);
zHex =sqlite3_mprintf("0x%lx",d64);
sqlite3_result_text(context, zHex, -1, sqlite3_free);
return;
}
break;
case SQLITE_TEXT:
pBlob = sqlite3_value_text(argv[0]);
n = sqlite3_value_bytes(argv[0]);
break;
case SQLITE_BLOB:
pBlob = sqlite3_value_blob(argv[0]);
n = sqlite3_value_bytes(argv[0]);
break;
default: return ;
}
if( n*2+1>SQLITE_MAX_LENGTH ){
//sqlite3_result_error_toobig(context);
return;
}
z = zHex = sqlite3_malloc(n*2 + 3);
if( zHex==0 ) return;
for(i=0; i<n; i++, pBlob++){
unsigned char c = *pBlob;
*(z++) = hexdigits[(c>>4)&0xf];
*(z++) = hexdigits[c&0xf];
}
*z = 0;
sqlite3_result_text(context, zHex, n*2, sqlite3_free);
}
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