Here is a extension code for writing PostScript tokens as output. You might find this useful if you want to do graphics with the SQL data, possibly.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "sqlite3ext.h"

static const sqlite3_api_routines*sqlite3_api;

static void fn_pstoken(sqlite3_context*cxt,int argc,sqlite3_value**argv) {
  sqlite3_str*str=sqlite3_str_new(sqlite3_context_db_handle(cxt));
  const unsigned char*c;
  int i,j,n;
  sqlite3_str_appendchar(str,1,'{');
  for(i=0;i<argc;i++) switch(sqlite3_value_type(argv[i])) {
    case SQLITE_NULL:
      sqlite3_str_append(str," //null",7);
      break;
    case SQLITE_FLOAT:
      sqlite3_str_appendf(str," %!f",sqlite3_value_double(argv[i]));
      break;
    case SQLITE_INTEGER:
      sqlite3_str_appendf(str," %lld",sqlite3_value_int64(argv[i]));
      break;
    case SQLITE_TEXT:
      c=sqlite3_value_text(argv[i]);
      n=sqlite3_value_bytes(argv[i]);
      sqlite3_str_append(str," (",2);
      for(j=0;j<n;j++) {
        if(c[j]=='(' || c[j]==')' || c[j]=='\\') sqlite3_str_appendchar(str,1,'\\');
        if(c[j]>=32 && c[j]<127) sqlite3_str_appendchar(str,1,c[j]); else sqlite3_str_appendf(str,"\\%03o",c[j]);
      }
      sqlite3_str_appendchar(str,1,')');
      break;
    case SQLITE_BLOB:
      c=sqlite3_value_blob(argv[i]);
      n=sqlite3_value_bytes(argv[i]);
      sqlite3_str_append(str," <",2);
      for(j=0;j<n;j++) sqlite3_str_appendf(str,"%02X",c[j]);
      sqlite3_str_appendchar(str,1,'>');
      break;
  }
  sqlite3_str_append(str," }",2);
  if(i=sqlite3_str_errcode(str)) {
    sqlite3_free(sqlite3_str_finish(str));
    if(i==SQLITE_TOOBIG) sqlite3_result_error_toobig(cxt);
    if(i==SQLITE_NOMEM) sqlite3_result_error_nomem(cxt);
  } else {
    sqlite3_result_text(cxt,sqlite3_str_finish(str),-1,sqlite3_free);
  }
}

int sqlite3_extension_init(sqlite3*db,const char**err,const struct sqlite3_api_routines*api) {
  sqlite3_api=api;
  sqlite3_create_function(db,"PSTOKEN",-1,SQLITE_UTF8|SQLITE_DETERMINISTIC,0,fn_pstoken,0,0);
  return SQLITE_OK;
}