PApp-SQL/SQL.xs

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

/* import some stuff from DBIXS.h and DBI.xs */
#define DBIXS_VERSION 93
#define DBI_MAGIC '~'

#define DBISTATE_PERLNAME "DBI::_dbistate"
#define DBISTATE_ADDRSV   (perl_get_sv (DBISTATE_PERLNAME, 0x05))
#define DBIS_PUBLISHED_LVALUE (*(INT2PTR(dbistate_t**, &SvIVX(DBISTATE_ADDRSV))))

static SV *sql_varchar, *sql_integer, *sql_double;
static SV *tmp_iv;

struct dbistate_st {
#define DBISTATE_VERSION  94    /* Must change whenever dbistate_t does */
    /* this must be the first member in structure                       */
    void (*check_version) _((const char *name,
                int dbis_cv, int dbis_cs, int need_dbixs_cv,
                int drc_s, int dbc_s, int stc_s, int fdc_s));

    /* version and size are used to check for DBI/DBD version mis-match */
    U16 version;        /* version of this structure                    */
    U16 size;
    U16 xs_version;     /* version of the overall DBIXS / DBD interface */
    U16 spare_pad;
};
typedef struct dbistate_st dbistate_t;

#define DBIcf_ACTIVE      0x000004      /* needs finish/disconnect before clear */

typedef U32 imp_sth;

/* not strictly part of the API... */
static imp_sth *
sth_get_imp (SV *sth)
{
  MAGIC *mg = mg_find (SvRV (sth), PERL_MAGIC_tied);
  sth = mg->mg_obj;
  mg = mg_find (SvRV (sth), DBI_MAGIC);
  return (imp_sth *)SvPVX (mg->mg_obj);
}

#define DBI_STH_ACTIVE(imp) (*(imp) & DBIcf_ACTIVE)

/* end of import section */

#if (PERL_VERSION < 5) || ((PERL_VERSION == 5) && (PERL_SUBVERSION <= 6))
# define get_sv      perl_get_sv
# define call_method perl_call_method
# define call_sv     perl_call_sv
#endif

#if (PERL_VERSION > 5) || ((PERL_VERSION == 5) && (PERL_SUBVERSION >= 6))
# define CAN_UTF8 1
#endif

#define MAX_CACHED_STATEMENT_SIZE 2048

static SV *
sql_upgrade_utf8 (SV *sv)
{
#if CAN_UTF8
  if (SvPOKp (sv))
    sv_utf8_upgrade (sv);
#endif
  return sv;
}

static SV *
mortalcopy_and_maybe_force_utf8(int utf8, SV *sv)
{
  sv = sv_mortalcopy (sv);
#if CAN_UTF8
  if (utf8 && SvPOKp (sv))
    SvUTF8_on (sv);
#endif
  return sv;
}

#define maybe_upgrade_utf8(utf8,sv) ((utf8) ? sql_upgrade_utf8 (sv) : (sv))

#define is_dbh(sv) ((sv) && sv_isobject (sv) && sv_derived_from ((sv), "DBI::db"))

typedef struct mc_node
{
  struct mc_node *next;
  HV *stash;
  U32 gen;

  /* DBH */
  SV *prepare;

  /* STH */
  SV *execute;
  SV *bind_param;
  SV *bind_columns;
  SV *fetchrow_arrayref;
  SV *fetchall_arrayref;
  SV *finish;
} mc_node;

static mc_node *first;

static mc_node *
mc_find (HV *stash)
{
  mc_node *mc;
  U32 gen = PL_sub_generation;

#ifdef HvMROMETA
  gen += HvMROMETA (stash)->cache_gen;
#endif

  for (mc = first; mc; mc = mc->next)
    if (mc->stash == stash && mc->gen == gen)
      return mc;

  if (!mc)
    {
      Newz (0, mc, 1, mc_node);
      mc->stash = stash;

      mc->next = first;
      first = mc;
    }
  else
    {
      mc->execute           =
      mc->bind_param        =
      mc->bind_columns      =
      mc->fetchrow_arrayref =
      mc->fetchall_arrayref =
      mc->finish            = 0;
    }

  mc->gen = gen;

  return mc;
}

static void
mc_cache (mc_node *mc, SV **method, const char *name)
{
  *method = (SV *)gv_fetchmethod_autoload (mc->stash, name, 0);

  if (!method)
    croak ("%s: method not found in stash, please report.", name);
}

#define mc_cache(mc, method) mc_cache ((mc), &((mc)->method), # method)

typedef struct lru_node
{
  struct lru_node *next;
  struct lru_node *prev;

  U32 hash;
  SV *dbh;
  SV *sql;

  SV *sth;
  imp_sth *sth_imp;

  mc_node *mc;
} lru_node;

static lru_node lru_list;
static int lru_size;
static int lru_maxsize;

#define lru_init() lru_list.next = &lru_list; lru_list.prev = &lru_list /* other fields are zero */

/* this is primitive, yet effective */
/* the returned value must never be zero (or bad things will happen) */
static U32
lru_hash (SV *dbh, SV *sql)
{
  STRLEN i, l;
  char *b = SvPV (sql, l);
  U32 hash = 2166136261U;

  hash = (hash ^ (U32)dbh) * 16777619U;
  hash = (hash ^        l) * 16777619U;

  /* start hashing at char 8, as this skips the "select " prefix */
  for (i = 7; i < l; i += i >> 2)
    hash = (hash ^  b [i]) * 16777619U;

  return hash;
}

/* fetch and "use" */
static lru_node *
lru_fetch (SV *dbh, SV *sql)
{
  lru_node *n;
  U32 hash;

  dbh = SvRV (dbh);
  hash = lru_hash (dbh, sql);

  n = &lru_list;
  do {
    n = n->next;

    if (!n->hash)
      return 0;
  } while (n->hash != hash
           || DBI_STH_ACTIVE (n->sth_imp)
           || !sv_eq (n->sql, sql)
           || n->dbh != dbh);

  /* found, so return to the start of the list */
  n->prev->next = n->next;
  n->next->prev = n->prev;

  n->next = lru_list.next;
  n->prev = &lru_list;
  lru_list.next->prev = n;
  lru_list.next = n;

  return n;
}

static void
lru_trim (void)
{
  while (lru_size > lru_maxsize)
    {
      /* nuke at the end */
      lru_node *n = lru_list.prev;

      n = lru_list.prev;

      lru_list.prev = n->prev;
      n->prev->next = &lru_list;

      SvREFCNT_dec (n->dbh);
      SvREFCNT_dec (n->sql);
      SvREFCNT_dec (n->sth);
      Safefree (n);
      
      lru_size--;
    }
}

/* store a not-yet existing entry(!) */
static void
lru_store (SV *dbh, SV *sql, SV *sth, mc_node *mc)
{
  lru_node *n;
  U32 hash;

  if (!lru_maxsize)
    return;
  
  dbh = SvRV (dbh);
  hash = lru_hash (dbh, sql);

  lru_size++;
  lru_trim ();

  New (0, n, 1, lru_node);

  n->hash    = hash;
  n->dbh     = dbh; SvREFCNT_inc (dbh); /* note: this is the dbi hash itself, not the reference */
  n->sql     = newSVsv (sql);
  n->sth     = sth; SvREFCNT_inc (sth);
  n->sth_imp = sth_get_imp (sth);
  n->mc      = mc;

  n->next    = lru_list.next;
  n->prev    = &lru_list;
  lru_list.next->prev = n;
  lru_list.next = n;
}

static void
lru_cachesize (int size)
{
  if (size >= 0)
    {
      lru_maxsize = size;
      lru_trim ();
    }
}

static GV *sql_exec;
static GV *DBH;

#define newconstpv(str) newSVpvn ((str), sizeof (str))

MODULE = PApp::SQL              PACKAGE = PApp::SQL

PROTOTYPES: DISABLE

BOOT:
{
   struct dbistate_st *dbis = DBIS_PUBLISHED_LVALUE;

   /* this is actually wrong, we should call the check member, apparently */
   assert (dbis->version == DBISTATE_VERSION);
   assert (dbis->xs_version == DBIXS_VERSION);

   tmp_iv = newSViv (0);

   sql_exec = gv_fetchpv ("PApp::SQL::sql_exec", TRUE, SVt_PV);
   DBH      = gv_fetchpv ("PApp::SQL::DBH"     , TRUE, SVt_PV);

   /* apache might BOOT: twice :( */
   if (lru_size)
     lru_cachesize (0);

   lru_init ();
   lru_cachesize (100);
}

void
boot2 (SV *t_str, SV *t_int, SV *t_dbl)
        CODE:
        sql_varchar = newSVsv (t_str);
        sql_integer = newSVsv (t_int);
        sql_double  = newSVsv (t_dbl);

int
cachesize(size = -1)
        int     size
        CODE:
        RETVAL = lru_maxsize;
        lru_cachesize (size);
        OUTPUT:
        RETVAL

void
sql_exec(...)
        ALIAS:
                sql_uexec     = 1
                sql_fetch     = 2
                sql_ufetch    = 3
                sql_fetchall  = 4
                sql_ufetchall = 5
                sql_exists    = 6
                sql_uexists   = 7
        PPCODE:
{
        if (items == 0)
          croak ("Usage: sql_exec [database-handle,] [bind-var-refs,... ] \"sql-statement\", [arguments, ...]");
        else
          {
            int i;
            int arg = 0;
            int bind_first, bind_last;
            int count;
            lru_node *lru;
            SV *dbh = ST(0);
            SV *sth;
            SV *sql;
            SV *execute;
            mc_node *mc;
            STRLEN dc, dd; /* dummy */
            I32 orig_stack = SP - PL_stack_base;

            /* save our arguments against destruction through function calls */
            SP += items;
            
            /* first check wether we should use an explicit db handle */
            if (!is_dbh (dbh))
              {
                /* the next line doesn't work - check why later maybe */
                /* dbh = get_sv ("DBH", FALSE);
                if (!is_dbh (dbh))
                  {*/
                    dbh = GvSV (DBH);
                    if (!is_dbh (dbh))
                      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)))
              arg++;

            bind_last = arg;

            /* consume the sql-statement itself */
            if (items <= arg)
              croak ("sql_exec: required argument \"sql-statement\" missing");

            if (!SvPOK (ST(arg)))
              croak ("sql_exec: sql-statement must be a string");

            sql = ST(arg); arg++;

            if ((ix & ~1) == 6)
              {
                SV *neu = sv_2mortal (newSVpv ("select count(*) > 0 from ", 0));
                sv_catsv (neu, sql);
                sv_catpv (neu, " limit 1");
                sql = neu;
                ix -= 4; /* sql_fetch */
              }

            /* now prepare all parameters, by unmagicalising them and upgrading them */
            for (i = arg; i < items; ++i)
              {
                SV *sv = ST (i);

                /* we sv_mortalcopy magical values since DBI seems to have a memory
                 * leak when magical values are passed into execute().
                 */
                if (SvMAGICAL (sv))
                  ST (i) = sv = sv_mortalcopy (sv);

                if ((ix & 1) && SvPOKp (sv) && !SvUTF8 (sv))
                  {
                    ST (i) = sv = sv_mortalcopy (sv);
                    sv_utf8_upgrade (sv);
                  }
              }

            /* check cache for existing statement handle */
            lru = SvCUR (sql) <= MAX_CACHED_STATEMENT_SIZE
                  ? lru_fetch (dbh, sql)
                  : 0;
            if (!lru)
              {
                mc = mc_find (SvSTASH (SvRV (dbh)));

                if (!mc->prepare)
                  mc_cache (mc, prepare);

                PUSHMARK (SP);
                EXTEND (SP, 2);
                PUSHs (dbh);
                PUSHs (sql);
                PUTBACK;
                count = call_sv (mc->prepare, G_SCALAR);
                SPAGAIN;

                if (count != 1)
                  croak ("sql_exec: unable to prepare() statement '%s': %s",
                         SvPV (sql, dc),
                         SvPV (get_sv ("DBI::errstr", TRUE), dd));

                sth = POPs;

                if (!SvROK (sth))
                  croak ("sql_exec: buggy DBD driver, prepare returned non-reference for '%s': %s",
                         SvPV (sql, dc),
                         SvPV (get_sv ("DBI::errstr", TRUE), dd));

                mc = mc_find (SvSTASH (SvRV (sth)));

                if (!mc->bind_param)
                  {
                    mc_cache (mc, bind_param);
                    mc_cache (mc, execute);
                    mc_cache (mc, finish);
                  }

                if (SvCUR (sql) <= MAX_CACHED_STATEMENT_SIZE)
                  lru_store (dbh, sql, sth, mc);

                /* on first execution we unfortunately need to use bind_param
                 * to mark any numeric parameters as such.
                 */
                SvIV_set (tmp_iv, 0);

                while (items > 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().
                     */

                    PUSHMARK (SP);
                    EXTEND (SP, 4);
                    PUSHs (sth);
                    SvIVX (tmp_iv)++;
                    SvIOK_only (tmp_iv);
                    PUSHs (tmp_iv);
                    PUSHs (sv);

                    PUSHs (
                       SvPOKp (sv) ? sql_varchar
                     : SvNOKp (sv) ? sql_double
                     : SvIOKp (sv) ? sql_integer
                     :               sql_varchar
                    );

                    PUTBACK;
                    call_sv (mc->bind_param, G_VOID);
                    SPAGAIN;

                    arg++;
                  }

                /* now use execute without any arguments */
                PUSHMARK (SP);
                EXTEND (SP, 1);
                PUSHs (sth);
              }
            else
              {
                sth = sv_2mortal (SvREFCNT_inc (lru->sth));
                mc  = lru->mc;

                /* we have previously executed this statement, so we
                 * use the cached types and use execute with arguments.
                 */

                PUSHMARK (SP);
                EXTEND (SP, items - arg + 1);
                PUSHs (sth);
                while (items > arg)
                  {
                    SV *sv = ST (arg);
                    PUSHs (sv);
                    arg++;
                  }
              }

            PUTBACK;
            /* { static GV *execute;
              if (!execute) execute = gv_fetchmethod_autoload(SvSTASH(SvRV(sth)), "execute", 0);
              count = call_sv(GvCV(execute), G_SCALAR);
             }*/
            count = call_sv (mc->execute, G_SCALAR);
            SPAGAIN;

            if (count != 1)
              croak ("sql_exec: execute() didn't return any value ('%s'): %s",
                     SvPV (sql, dc),
                     SvPV (get_sv ("DBI::errstr", TRUE), dd));

            execute = POPs;

            if (!SvTRUE (execute))
              croak ("sql_exec: unable to execute statement '%s' (%s)",
                     SvPV (sql, dc),
                     SvPV (get_sv ("DBI::errstr", TRUE), dd));

            sv_setsv (GvSV (sql_exec), execute);

            if (bind_first != bind_last)
              {
                PUSHMARK (SP);
                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);

                PUTBACK;

                if (!mc->bind_columns)
                  mc_cache (mc, bind_columns);

                count = call_sv (mc->bind_columns, G_SCALAR);

                SPAGAIN;

                if (count != 1)
                  croak ("sql_exec: bind_columns() didn't return any value ('%s'): %s",
                         SvPV (sql, dc),
                         SvPV (get_sv ("DBI::errstr", TRUE), dd));

                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;
              }

            if ((ix & ~1) == 2)
              { /* sql_fetch */
                SV *row;

                PUSHMARK (SP);
                XPUSHs (sth);
                PUTBACK;

                if (!mc->fetchrow_arrayref)
                  mc_cache (mc, fetchrow_arrayref);

                count = call_sv (mc->fetchrow_arrayref, G_SCALAR);
                SPAGAIN;

                if (count != 1)
                  abort ();

                row = POPs;

                SP = PL_stack_base + orig_stack;

                if (SvROK (row))
                  {
                    AV *av;

                    switch (GIMME_V)
                      {
                        case G_VOID:
                          /* no thing */
                          break;
                        case G_SCALAR:
                          /* the first element */
                          XPUSHs (mortalcopy_and_maybe_force_utf8 (ix & 1, AvARRAY ((AV *)SvRV (row))[0]));
                          count = 1;
                          break;
                        case G_ARRAY:
                          av = (AV *)SvRV (row);
                          count = AvFILL (av) + 1;
                          EXTEND (SP, count);
                          for (arg = 0; arg < count; arg++)
                            PUSHs (mortalcopy_and_maybe_force_utf8 (ix & 1, AvARRAY (av)[arg]));

                          break;
                        default:
                          abort ();
                      }
                 }
              }
            else if ((ix & ~1) == 4)
              { /* sql_fetchall */
                SV *rows;

                PUSHMARK (SP);
                XPUSHs (sth);
                PUTBACK;

                if (!mc->fetchall_arrayref)
                  mc_cache (mc, fetchall_arrayref);

                count = call_sv (mc->fetchall_arrayref, G_SCALAR);
                SPAGAIN;

                if (count != 1)
                  abort ();

                rows = POPs;

                SP = PL_stack_base + orig_stack;

                if (SvROK (rows))
                  {
                    AV *av = (AV *)SvRV (rows);
                    count = AvFILL (av) + 1;

                    if (count)
                      {
                        int columns = AvFILL ((AV *) SvRV (AvARRAY (av)[0])) + 1; /* columns? */

                        EXTEND (SP, count);
                        if (columns == 1)
                          for (arg = 0; arg < count; arg++)
                            PUSHs (mortalcopy_and_maybe_force_utf8 (ix & 1, AvARRAY ((AV *)SvRV (AvARRAY (av)[arg]))[0]));
                        else
                          for (arg = 0; arg < count; arg++)
                            PUSHs (mortalcopy_and_maybe_force_utf8 (ix & 1, AvARRAY (av)[arg]));
                      }
                 }
              }
            else
              {
                SP = PL_stack_base + orig_stack;
                XPUSHs (sth);
              }

            if (ix > 1 || GIMME_V == G_VOID)
              {
                orig_stack = SP - PL_stack_base;

                PUSHMARK (SP);
                XPUSHs (sth);
                PUTBACK;

                if (!mc->finish)
                  mc_cache (mc, finish);

                call_sv (mc->finish, G_DISCARD);
                SPAGAIN;

                SP = PL_stack_base + orig_stack;
              }
          }
}


Revision:	1.30
Committed:	Mon Jun 24 19:24:01 2019 UTC (5 years, 1 month ago) by root
Branch:	MAIN
Changes since 1.29:	+1 -0 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#include "EXTERN.h"
2			#include "perl.h"
3			#include "XSUB.h"
4
5	root	1.22	/* import some stuff from DBIXS.h and DBI.xs */
6			#define DBIXS_VERSION 93
7			#define DBI_MAGIC '~'
8
9			#define DBISTATE_PERLNAME "DBI::_dbistate"
10	root	1.24	#define DBISTATE_ADDRSV (perl_get_sv (DBISTATE_PERLNAME, 0x05))
11	root	1.22	#define DBIS_PUBLISHED_LVALUE ((INT2PTR(dbistate_t*, &SvIVX(DBISTATE_ADDRSV))))
12
13	root	1.24	static SV sql_varchar, sql_integer, *sql_double;
14			static SV *tmp_iv;
15
16	root	1.22	struct dbistate_st {
17			#define DBISTATE_VERSION 94 /* Must change whenever dbistate_t does */
18			/* this must be the first member in structure */
19			void (check_version) _((const char name,
20			int dbis_cv, int dbis_cs, int need_dbixs_cv,
21			int drc_s, int dbc_s, int stc_s, int fdc_s));
22
23			/* version and size are used to check for DBI/DBD version mis-match */
24			U16 version; /* version of this structure */
25			U16 size;
26			U16 xs_version; /* version of the overall DBIXS / DBD interface */
27			U16 spare_pad;
28			};
29			typedef struct dbistate_st dbistate_t;
30
31			#define DBIcf_ACTIVE 0x000004 /* needs finish/disconnect before clear */
32
33			typedef U32 imp_sth;
34
35			/* not strictly part of the API... */
36			static imp_sth *
37			sth_get_imp (SV *sth)
38			{
39			MAGIC *mg = mg_find (SvRV (sth), PERL_MAGIC_tied);
40			sth = mg->mg_obj;
41			mg = mg_find (SvRV (sth), DBI_MAGIC);
42			return (imp_sth *)SvPVX (mg->mg_obj);
43			}
44
45			#define DBI_STH_ACTIVE(imp) (*(imp) & DBIcf_ACTIVE)
46
47			/* end of import section */
48
49	root	1.3	#if (PERL_VERSION < 5) \|\| ((PERL_VERSION == 5) && (PERL_SUBVERSION <= 6))
50	root	1.5	# define get_sv perl_get_sv
51	root	1.3	# define call_method perl_call_method
52	root	1.5	# define call_sv perl_call_sv
53	root	1.3	#endif
54
55	root	1.11	#if (PERL_VERSION > 5) \|\| ((PERL_VERSION == 5) && (PERL_SUBVERSION >= 6))
56	root	1.5	# define CAN_UTF8 1
57			#endif
58
59	root	1.22	#define MAX_CACHED_STATEMENT_SIZE 2048
60	root	1.14
61	root	1.5	static SV *
62			sql_upgrade_utf8 (SV *sv)
63			{
64			#if CAN_UTF8
65	root	1.24	if (SvPOKp (sv))
66	root	1.5	sv_utf8_upgrade (sv);
67			#endif
68			return sv;
69			}
70
71			static SV *
72	root	1.13	mortalcopy_and_maybe_force_utf8(int utf8, SV *sv)
73	root	1.5	{
74	root	1.13	sv = sv_mortalcopy (sv);
75	root	1.5	#if CAN_UTF8
76	root	1.24	if (utf8 && SvPOKp (sv))
77	root	1.5	SvUTF8_on (sv);
78			#endif
79			return sv;
80			}
81
82			#define maybe_upgrade_utf8(utf8,sv) ((utf8) ? sql_upgrade_utf8 (sv) : (sv))
83
84	root	1.2	#define is_dbh(sv) ((sv) && sv_isobject (sv) && sv_derived_from ((sv), "DBI::db"))
85	root	1.1
86	root	1.24	typedef struct mc_node
87			{
88			struct mc_node *next;
89			HV *stash;
90			U32 gen;
91
92			/* DBH */
93			SV *prepare;
94
95			/* STH */
96			SV *execute;
97			SV *bind_param;
98			SV *bind_columns;
99			SV *fetchrow_arrayref;
100			SV *fetchall_arrayref;
101			SV *finish;
102			} mc_node;
103
104			static mc_node *first;
105
106			static mc_node *
107			mc_find (HV *stash)
108			{
109			mc_node *mc;
110			U32 gen = PL_sub_generation;
111
112			#ifdef HvMROMETA
113			gen += HvMROMETA (stash)->cache_gen;
114			#endif
115
116			for (mc = first; mc; mc = mc->next)
117			if (mc->stash == stash && mc->gen == gen)
118			return mc;
119
120			if (!mc)
121			{
122			Newz (0, mc, 1, mc_node);
123			mc->stash = stash;
124
125			mc->next = first;
126			first = mc;
127			}
128			else
129			{
130			mc->execute =
131			mc->bind_param =
132			mc->bind_columns =
133			mc->fetchrow_arrayref =
134			mc->fetchall_arrayref =
135			mc->finish = 0;
136			}
137
138			mc->gen = gen;
139
140			return mc;
141			}
142
143			static void
144			mc_cache (mc_node mc, SV method, const char name)
145			{
146			method = (SV )gv_fetchmethod_autoload (mc->stash, name, 0);
147
148			if (!method)
149	root	1.28	croak ("%s: method not found in stash, please report.", name);
150	root	1.24	}
151
152			#define mc_cache(mc, method) mc_cache ((mc), &((mc)->method), # method)
153
154			typedef struct lru_node
155			{
156	root	1.1	struct lru_node *next;
157			struct lru_node *prev;
158	root	1.24
159			U32 hash;
160	root	1.1	SV *dbh;
161			SV *sql;
162
163			SV *sth;
164	root	1.22	imp_sth *sth_imp;
165	root	1.24
166			mc_node *mc;
167	root	1.1	} lru_node;
168
169			static lru_node lru_list;
170			static int lru_size;
171			static int lru_maxsize;
172
173	root	1.22	#define lru_init() lru_list.next = &lru_list; lru_list.prev = &lru_list /* other fields are zero */
174	root	1.1
175			/* this is primitive, yet effective */
176			/* the returned value must never be zero (or bad things will happen) */
177	root	1.24	static U32
178			lru_hash (SV dbh, SV sql)
179			{
180			STRLEN i, l;
181			char *b = SvPV (sql, l);
182	root	1.26	U32 hash = 2166136261U;
183	root	1.24
184			hash = (hash ^ (U32)dbh) * 16777619U;
185			hash = (hash ^ l) * 16777619U;
186
187	root	1.30	/* start hashing at char 8, as this skips the "select " prefix */
188	root	1.24	for (i = 7; i < l; i += i >> 2)
189			hash = (hash ^ b [i]) * 16777619U;
190
191			return hash;
192			}
193	root	1.1
194			/* fetch and "use" */
195	root	1.24	static lru_node *
196	root	1.22	lru_fetch (SV dbh, SV sql)
197	root	1.1	{
198			lru_node *n;
199			U32 hash;
200
201			dbh = SvRV (dbh);
202	root	1.24	hash = lru_hash (dbh, sql);
203	root	1.1
204			n = &lru_list;
205			do {
206			n = n->next;
207	root	1.22
208	root	1.1	if (!n->hash)
209			return 0;
210			} while (n->hash != hash
211	root	1.22	\|\| DBI_STH_ACTIVE (n->sth_imp)
212	root	1.1	\|\| !sv_eq (n->sql, sql)
213			\|\| n->dbh != dbh);
214
215			/* found, so return to the start of the list */
216			n->prev->next = n->next;
217			n->next->prev = n->prev;
218
219			n->next = lru_list.next;
220			n->prev = &lru_list;
221			lru_list.next->prev = n;
222			lru_list.next = n;
223
224	root	1.24	return n;
225	root	1.1	}
226
227	root	1.22	static void
228			lru_trim (void)
229	root	1.1	{
230	root	1.22	while (lru_size > lru_maxsize)
231			{
232			/* nuke at the end */
233			lru_node *n = lru_list.prev;
234	root	1.1
235	root	1.22	n = lru_list.prev;
236	root	1.1
237	root	1.22	lru_list.prev = n->prev;
238			n->prev->next = &lru_list;
239	root	1.1
240	root	1.22	SvREFCNT_dec (n->dbh);
241			SvREFCNT_dec (n->sql);
242			SvREFCNT_dec (n->sth);
243			Safefree (n);
244
245			lru_size--;
246			}
247	root	1.1	}
248
249			/* store a not-yet existing entry(!) */
250	root	1.22	static void
251	root	1.24	lru_store (SV dbh, SV sql, SV sth, mc_node mc)
252	root	1.1	{
253			lru_node *n;
254			U32 hash;
255
256	root	1.22	if (!lru_maxsize)
257			return;
258
259	root	1.1	dbh = SvRV (dbh);
260	root	1.24	hash = lru_hash (dbh, sql);
261	root	1.1
262			lru_size++;
263	root	1.22	lru_trim ();
264	root	1.1
265			New (0, n, 1, lru_node);
266
267	root	1.22	n->hash = hash;
268			n->dbh = dbh; SvREFCNT_inc (dbh); /* note: this is the dbi hash itself, not the reference */
269			n->sql = newSVsv (sql);
270			n->sth = sth; SvREFCNT_inc (sth);
271			n->sth_imp = sth_get_imp (sth);
272	root	1.24	n->mc = mc;
273	root	1.1
274	root	1.22	n->next = lru_list.next;
275			n->prev = &lru_list;
276	root	1.1	lru_list.next->prev = n;
277			lru_list.next = n;
278			}
279
280	root	1.22	static void
281			lru_cachesize (int size)
282	root	1.1	{
283			if (size >= 0)
284			{
285			lru_maxsize = size;
286	root	1.22	lru_trim ();
287	root	1.1	}
288			}
289
290			static GV *sql_exec;
291			static GV *DBH;
292	root	1.5
293			#define newconstpv(str) newSVpvn ((str), sizeof (str))
294	root	1.1
295			MODULE = PApp::SQL PACKAGE = PApp::SQL
296
297			PROTOTYPES: DISABLE
298
299			BOOT:
300			{
301	root	1.22	struct dbistate_st *dbis = DBIS_PUBLISHED_LVALUE;
302
303	root	1.23	/* this is actually wrong, we should call the check member, apparently */
304	root	1.22	assert (dbis->version == DBISTATE_VERSION);
305			assert (dbis->xs_version == DBIXS_VERSION);
306
307	root	1.24	tmp_iv = newSViv (0);
308
309	root	1.1	sql_exec = gv_fetchpv ("PApp::SQL::sql_exec", TRUE, SVt_PV);
310			DBH = gv_fetchpv ("PApp::SQL::DBH" , TRUE, SVt_PV);
311
312			/* apache might BOOT: twice :( */
313			if (lru_size)
314			lru_cachesize (0);
315
316	root	1.22	lru_init ();
317	root	1.24	lru_cachesize (100);
318	root	1.1	}
319
320	root	1.24	void
321			boot2 (SV t_str, SV t_int, SV *t_dbl)
322			CODE:
323			sql_varchar = newSVsv (t_str);
324			sql_integer = newSVsv (t_int);
325			sql_double = newSVsv (t_dbl);
326
327	root	1.1	int
328			cachesize(size = -1)
329			int size
330			CODE:
331			RETVAL = lru_maxsize;
332			lru_cachesize (size);
333			OUTPUT:
334			RETVAL
335
336			void
337			sql_exec(...)
338			ALIAS:
339	root	1.5	sql_uexec = 1
340	root	1.27	sql_fetch = 2
341	root	1.5	sql_ufetch = 3
342			sql_fetchall = 4
343			sql_ufetchall = 5
344			sql_exists = 6
345			sql_uexists = 7
346	root	1.1	PPCODE:
347			{
348			if (items == 0)
349			croak ("Usage: sql_exec [database-handle,] [bind-var-refs,... ] \"sql-statement\", [arguments, ...]");
350			else
351			{
352	root	1.24	int i;
353	root	1.1	int arg = 0;
354			int bind_first, bind_last;
355			int count;
356	root	1.24	lru_node *lru;
357	root	1.1	SV *dbh = ST(0);
358			SV *sth;
359			SV *sql;
360			SV *execute;
361	root	1.24	mc_node *mc;
362	root	1.9	STRLEN dc, dd; /* dummy */
363	root	1.24	I32 orig_stack = SP - PL_stack_base;
364	root	1.1
365			/* save our arguments against destruction through function calls */
366			SP += items;
367
368			/* first check wether we should use an explicit db handle */
369			if (!is_dbh (dbh))
370			{
371	root	1.12	/* the next line doesn't work - check why later maybe */
372			/* dbh = get_sv ("DBH", FALSE);
373	root	1.1	if (!is_dbh (dbh))
374	root	1.12	{*/
375	root	1.20	dbh = GvSV (DBH);
376	root	1.1	if (!is_dbh (dbh))
377	root	1.12	croak ("sql_exec: no $DBH argument and no fallback in $PApp::SQL::DBH");
378			/*croak ("sql_exec: no $DBH found in current package or in PApp::SQL::");
379			}*/
380	root	1.1	}
381			else
382			arg++; /* we consumed one argument */
383
384	root	1.20	/* be more Coro-friendly by keeping a copy, so different threads */
385	root	1.21	/* can replace their global handles */
386	root	1.20	dbh = sv_2mortal (newSVsv (dbh));
387
388	root	1.1	/* count the remaining references (for bind_columns) */
389			bind_first = arg;
390			while (items > arg && SvROK (ST(arg)))
391			arg++;
392
393			bind_last = arg;
394
395			/* consume the sql-statement itself */
396			if (items <= arg)
397			croak ("sql_exec: required argument \"sql-statement\" missing");
398
399			if (!SvPOK (ST(arg)))
400			croak ("sql_exec: sql-statement must be a string");
401
402			sql = ST(arg); arg++;
403
404	root	1.5	if ((ix & ~1) == 6)
405	root	1.1	{
406			SV neu = sv_2mortal (newSVpv ("select count() > 0 from ", 0));
407			sv_catsv (neu, sql);
408			sv_catpv (neu, " limit 1");
409			sql = neu;
410	root	1.7	ix -= 4; /* sql_fetch */
411	root	1.1	}
412
413	root	1.24	/* now prepare all parameters, by unmagicalising them and upgrading them */
414			for (i = arg; i < items; ++i)
415			{
416			SV *sv = ST (i);
417
418			/* we sv_mortalcopy magical values since DBI seems to have a memory
419			* leak when magical values are passed into execute().
420			*/
421			if (SvMAGICAL (sv))
422			ST (i) = sv = sv_mortalcopy (sv);
423
424			if ((ix & 1) && SvPOKp (sv) && !SvUTF8 (sv))
425			{
426			ST (i) = sv = sv_mortalcopy (sv);
427			sv_utf8_upgrade (sv);
428			}
429			}
430
431	root	1.4	/* check cache for existing statement handle */
432	root	1.24	lru = SvCUR (sql) <= MAX_CACHED_STATEMENT_SIZE
433			? lru_fetch (dbh, sql)
434			: 0;
435			if (!lru)
436	root	1.1	{
437	root	1.24	mc = mc_find (SvSTASH (SvRV (dbh)));
438
439			if (!mc->prepare)
440			mc_cache (mc, prepare);
441
442	root	1.1	PUSHMARK (SP);
443			EXTEND (SP, 2);
444			PUSHs (dbh);
445			PUSHs (sql);
446			PUTBACK;
447	root	1.24	count = call_sv (mc->prepare, G_SCALAR);
448	root	1.1	SPAGAIN;
449
450			if (count != 1)
451			croak ("sql_exec: unable to prepare() statement '%s': %s",
452	root	1.3	SvPV (sql, dc),
453	root	1.9	SvPV (get_sv ("DBI::errstr", TRUE), dd));
454	root	1.1
455			sth = POPs;
456
457	root	1.25	if (!SvROK (sth))
458			croak ("sql_exec: buggy DBD driver, prepare returned non-reference for '%s': %s",
459			SvPV (sql, dc),
460			SvPV (get_sv ("DBI::errstr", TRUE), dd));
461
462	root	1.24	mc = mc_find (SvSTASH (SvRV (sth)));
463
464			if (!mc->bind_param)
465			{
466			mc_cache (mc, bind_param);
467			mc_cache (mc, execute);
468			mc_cache (mc, finish);
469			}
470
471			if (SvCUR (sql) <= MAX_CACHED_STATEMENT_SIZE)
472			lru_store (dbh, sql, sth, mc);
473
474			/* on first execution we unfortunately need to use bind_param
475			* to mark any numeric parameters as such.
476			*/
477			SvIV_set (tmp_iv, 0);
478
479			while (items > arg)
480			{
481			SV *sv = ST (arg);
482			/* we sv_mortalcopy magical values since DBI seems to have a memory
483			* leak when magical values are passed into execute().
484			*/
485
486			PUSHMARK (SP);
487			EXTEND (SP, 4);
488			PUSHs (sth);
489			SvIVX (tmp_iv)++;
490	root	1.29	SvIOK_only (tmp_iv);
491	root	1.24	PUSHs (tmp_iv);
492			PUSHs (sv);
493
494			PUSHs (
495			SvPOKp (sv) ? sql_varchar
496			: SvNOKp (sv) ? sql_double
497			: SvIOKp (sv) ? sql_integer
498			: sql_varchar
499			);
500
501			PUTBACK;
502			call_sv (mc->bind_param, G_VOID);
503			SPAGAIN;
504
505			arg++;
506			}
507
508			/* now use execute without any arguments */
509			PUSHMARK (SP);
510			EXTEND (SP, 1);
511			PUSHs (sth);
512	root	1.1	}
513	root	1.24	else
514			{
515			sth = sv_2mortal (SvREFCNT_inc (lru->sth));
516			mc = lru->mc;
517	root	1.1
518	root	1.24	/* we have previously executed this statement, so we
519			* use the cached types and use execute with arguments.
520	root	1.15	*/
521	root	1.24
522			PUSHMARK (SP);
523			EXTEND (SP, items - arg + 1);
524			PUSHs (sth);
525			while (items > arg)
526			{
527			SV *sv = ST (arg);
528	root	1.27	PUSHs (sv);
529	root	1.24	arg++;
530			}
531	root	1.1	}
532
533			PUTBACK;
534			/* { static GV *execute;
535			if (!execute) execute = gv_fetchmethod_autoload(SvSTASH(SvRV(sth)), "execute", 0);
536			count = call_sv(GvCV(execute), G_SCALAR);
537			}*/
538	root	1.24	count = call_sv (mc->execute, G_SCALAR);
539	root	1.1	SPAGAIN;
540
541			if (count != 1)
542			croak ("sql_exec: execute() didn't return any value ('%s'): %s",
543	root	1.3	SvPV (sql, dc),
544	root	1.10	SvPV (get_sv ("DBI::errstr", TRUE), dd));
545	root	1.1
546			execute = POPs;
547
548			if (!SvTRUE (execute))
549			croak ("sql_exec: unable to execute statement '%s' (%s)",
550	root	1.3	SvPV (sql, dc),
551	root	1.10	SvPV (get_sv ("DBI::errstr", TRUE), dd));
552	root	1.1
553	root	1.24	sv_setsv (GvSV (sql_exec), execute);
554	root	1.1
555			if (bind_first != bind_last)
556			{
557			PUSHMARK (SP);
558			EXTEND (SP, bind_last - bind_first + 2);
559			PUSHs (sth);
560			do {
561	stefan	1.16	#if CAN_UTF8
562	root	1.17	if (ix & 1)
563			SvUTF8_on (SvRV(ST(bind_first)));
564	stefan	1.16	#endif
565	root	1.1	PUSHs (ST(bind_first));
566			bind_first++;
567			} while (bind_first != bind_last);
568
569			PUTBACK;
570	root	1.24
571			if (!mc->bind_columns)
572			mc_cache (mc, bind_columns);
573
574			count = call_sv (mc->bind_columns, G_SCALAR);
575
576	root	1.1	SPAGAIN;
577
578			if (count != 1)
579			croak ("sql_exec: bind_columns() didn't return any value ('%s'): %s",
580	root	1.3	SvPV (sql, dc),
581	root	1.10	SvPV (get_sv ("DBI::errstr", TRUE), dd));
582	root	1.1
583	root	1.19	if (!SvOK (TOPs))
584	root	1.1	croak ("sql_exec: bind_columns() didn't return a true ('%s'): %s",
585	root	1.3	SvPV (sql, dc),
586	root	1.10	SvPV (get_sv ("DBI::errstr", TRUE), dd));
587	root	1.19
588			POPs;
589	root	1.1	}
590
591	root	1.5	if ((ix & ~1) == 2)
592	root	1.1	{ /* sql_fetch */
593			SV *row;
594
595			PUSHMARK (SP);
596			XPUSHs (sth);
597			PUTBACK;
598	root	1.24
599			if (!mc->fetchrow_arrayref)
600			mc_cache (mc, fetchrow_arrayref);
601
602			count = call_sv (mc->fetchrow_arrayref, G_SCALAR);
603	root	1.1	SPAGAIN;
604
605			if (count != 1)
606			abort ();
607
608			row = POPs;
609
610	root	1.24	SP = PL_stack_base + orig_stack;
611
612	root	1.1	if (SvROK (row))
613			{
614			AV *av;
615
616			switch (GIMME_V)
617			{
618			case G_VOID:
619			/* no thing */
620			break;
621			case G_SCALAR:
622			/* the first element */
623	root	1.29	XPUSHs (mortalcopy_and_maybe_force_utf8 (ix & 1, AvARRAY ((AV *)SvRV (row))[0]));
624	root	1.24	count = 1;
625	root	1.1	break;
626			case G_ARRAY:
627			av = (AV *)SvRV (row);
628			count = AvFILL (av) + 1;
629			EXTEND (SP, count);
630			for (arg = 0; arg < count; arg++)
631	root	1.13	PUSHs (mortalcopy_and_maybe_force_utf8 (ix & 1, AvARRAY (av)[arg]));
632	root	1.1
633			break;
634			default:
635			abort ();
636			}
637			}
638			}
639	root	1.5	else if ((ix & ~1) == 4)
640	root	1.1	{ /* sql_fetchall */
641			SV *rows;
642
643			PUSHMARK (SP);
644			XPUSHs (sth);
645			PUTBACK;
646	root	1.24
647			if (!mc->fetchall_arrayref)
648			mc_cache (mc, fetchall_arrayref);
649
650			count = call_sv (mc->fetchall_arrayref, G_SCALAR);
651	root	1.1	SPAGAIN;
652
653			if (count != 1)
654			abort ();
655
656			rows = POPs;
657
658	root	1.24	SP = PL_stack_base + orig_stack;
659
660	root	1.1	if (SvROK (rows))
661			{
662			AV av = (AV )SvRV (rows);
663			count = AvFILL (av) + 1;
664
665			if (count)
666			{
667	root	1.6	int columns = AvFILL ((AV ) SvRV (AvARRAY (av)[0])) + 1; / columns? */
668	root	1.1
669			EXTEND (SP, count);
670			if (columns == 1)
671			for (arg = 0; arg < count; arg++)
672	root	1.13	PUSHs (mortalcopy_and_maybe_force_utf8 (ix & 1, AvARRAY ((AV *)SvRV (AvARRAY (av)[arg]))[0]));
673	root	1.1	else
674			for (arg = 0; arg < count; arg++)
675	root	1.13	PUSHs (mortalcopy_and_maybe_force_utf8 (ix & 1, AvARRAY (av)[arg]));
676	root	1.1	}
677			}
678			}
679			else
680	root	1.24	{
681			SP = PL_stack_base + orig_stack;
682			XPUSHs (sth);
683			}
684	root	1.1
685	root	1.5	if (ix > 1 \|\| GIMME_V == G_VOID)
686	root	1.1	{
687	root	1.24	orig_stack = SP - PL_stack_base;
688
689	root	1.1	PUSHMARK (SP);
690			XPUSHs (sth);
691			PUTBACK;
692	root	1.24
693			if (!mc->finish)
694			mc_cache (mc, finish);
695
696			call_sv (mc->finish, G_DISCARD);
697	root	1.1	SPAGAIN;
698	root	1.24
699			SP = PL_stack_base + orig_stack;
700	root	1.1	}
701			}
702			}
703
704
705