--- PApp-SQL/SQL.xs	2001/12/31 03:07:57	1.10
+++ PApp-SQL/SQL.xs	2009/06/21 00:28:18	1.21
@@ -8,10 +8,12 @@
 # define call_sv     perl_call_sv
 #endif
 
-#if (PERL_VERSION < 5) || ((PERL_VERSION == 5) && (PERL_SUBVERSION <= 5))
+#if (PERL_VERSION > 5) || ((PERL_VERSION == 5) && (PERL_SUBVERSION >= 6))
 # define CAN_UTF8 1
 #endif
 
+#define MAX_CACHED_STATEMENT_SIZE 8192
+
 static SV *
 sql_upgrade_utf8 (SV *sv)
 {
@@ -23,17 +25,17 @@
 }
 
 static SV *
-sql_force_utf8 (SV *sv)
+mortalcopy_and_maybe_force_utf8(int utf8, SV *sv)
 {
+  sv = sv_mortalcopy (sv);
 #if CAN_UTF8
-  if (SvPOK (sv))
+  if (utf8 && SvPOK (sv))
     SvUTF8_on (sv);
 #endif
   return sv;
 }
 
 #define maybe_upgrade_utf8(utf8,sv) ((utf8) ? sql_upgrade_utf8 (sv) : (sv))
-#define maybe_force_utf8(utf8,sv)   ((utf8) ? sql_force_utf8   (sv) : (sv))
 
 #define is_dbh(sv) ((sv) && sv_isobject (sv) && sv_derived_from ((sv), "DBI::db"))
 
@@ -62,7 +64,7 @@
 /* this is primitive, yet effective */
 /* the returned value must never be zero (or bad things will happen) */
 #define lru_hash do {	\
-	hash = (((U32)dbh)>>2);	\
+	hash = (((U32)(long)dbh)>>2);	\
         hash += *statement;\
         hash += len;		\
 } while (0)
@@ -235,17 +237,23 @@
             /* first check wether we should use an explicit db handle */
             if (!is_dbh (dbh))
               {
-                dbh = get_sv ("DBH", FALSE);
+                /* the next line doesn't work - check why later maybe */
+                /* dbh = get_sv ("DBH", FALSE);
                 if (!is_dbh (dbh))
-                  {
-                    dbh = GvSV(DBH);
+                  {*/
+                    dbh = GvSV (DBH);
                     if (!is_dbh (dbh))
-                      croak ("sql_exec: no $DBH found in current package or in PApp::SQL::");
-                  }
+                      croak ("sql_exec: no $DBH argument and no fallback in $PApp::SQL::DBH");
+                      /*croak ("sql_exec: no $DBH found in current package or in PApp::SQL::");
+                  }*/
               }
             else
               arg++; /* we consumed one argument */
 
+            /* be more Coro-friendly by keeping a copy, so different threads */
+            /* can replace their global handles */
+            dbh = sv_2mortal (newSVsv (dbh));
+
             /* count the remaining references (for bind_columns) */
             bind_first = arg;
             while (items > arg && SvROK (ST(arg)))
@@ -290,7 +298,8 @@
 
                 sth = POPs;
 
-                lru_store (dbh, sql, sth);
+                if (SvLEN (sql) < MAX_CACHED_STATEMENT_SIZE)
+                  lru_store (dbh, sql, sth);
               }
 
             PUSHMARK (SP);
@@ -298,7 +307,11 @@
             PUSHs (sth);
             while (items > arg)
               {
-                PUSHs (maybe_upgrade_utf8 (ix & 1, ST(arg)));
+                SV *sv = ST(arg);
+                /* we sv_mortalcopy magical values since DBI seems to have a memory
+                 * leak when magical values are passed into execute().
+                 */
+                PUSHs (maybe_upgrade_utf8 (ix & 1, SvMAGICAL(sv) ? sv_mortalcopy(sv) : sv));
                 arg++;
               }
 
@@ -330,6 +343,10 @@
                 EXTEND (SP, bind_last - bind_first + 2);
                 PUSHs (sth);
                 do {
+#if CAN_UTF8
+                  if (ix & 1)
+                     SvUTF8_on (SvRV(ST(bind_first)));
+#endif
                   PUSHs (ST(bind_first));
                   bind_first++;
                 } while (bind_first != bind_last);
@@ -343,13 +360,15 @@
                          SvPV (sql, dc),
                          SvPV (get_sv ("DBI::errstr", TRUE), dd));
 
-                if (!SvOK (POPs))
+                if (!SvOK (TOPs))
                   croak ("sql_exec: bind_columns() didn't return a true ('%s'): %s",
                          SvPV (sql, dc),
                          SvPV (get_sv ("DBI::errstr", TRUE), dd));
+
+                POPs;
               }
 
-            /* free our arguments from the stack */
+            /* restore our arguments again */
             SP -= items;
 
             if ((ix & ~1) == 2)
@@ -378,14 +397,14 @@
                           break;
                         case G_SCALAR:
                           /* the first element */
-                          XPUSHs (maybe_force_utf8 (ix & 1, *av_fetch ((AV *)SvRV (row), 0, 1)));
+                          XPUSHs (mortalcopy_and_maybe_force_utf8 (ix & 1, *av_fetch ((AV *)SvRV (row), 0, 1)));
                           break;
                         case G_ARRAY:
                           av = (AV *)SvRV (row);
                           count = AvFILL (av) + 1;
                           EXTEND (SP, count);
                           for (arg = 0; arg < count; arg++)
-                            PUSHs (maybe_force_utf8 (ix & 1, AvARRAY (av)[arg]));
+                            PUSHs (mortalcopy_and_maybe_force_utf8 (ix & 1, AvARRAY (av)[arg]));
 
                           break;
                         default:
@@ -420,10 +439,10 @@
                         EXTEND (SP, count);
                         if (columns == 1)
                           for (arg = 0; arg < count; arg++)
-                            PUSHs (maybe_force_utf8 (ix & 1, AvARRAY ((AV *)SvRV (AvARRAY (av)[arg]))[0]));
+                            PUSHs (mortalcopy_and_maybe_force_utf8 (ix & 1, AvARRAY ((AV *)SvRV (AvARRAY (av)[arg]))[0]));
                         else
                           for (arg = 0; arg < count; arg++)
-                            PUSHs (maybe_force_utf8 (ix & 1, AvARRAY (av)[arg]));
+                            PUSHs (mortalcopy_and_maybe_force_utf8 (ix & 1, AvARRAY (av)[arg]));
                       }
                  }
               }