1 |
#include "EXTERN.h" |
2 |
#include "perl.h" |
3 |
#include "XSUB.h" |
4 |
|
5 |
#define is_dbh(sv) ((sv) && sv_isobject (sv) && sv_derived_from ((sv), "DBI::db")) |
6 |
|
7 |
typedef struct lru_node { |
8 |
struct lru_node *next; |
9 |
struct lru_node *prev; |
10 |
U32 hash; |
11 |
SV *dbh; |
12 |
SV *sql; |
13 |
|
14 |
SV *sth; |
15 |
#if 0 /* method cache */ |
16 |
GV *execute; |
17 |
GV *bind_columns; |
18 |
GV *fetch; |
19 |
#endif |
20 |
} lru_node; |
21 |
|
22 |
static lru_node lru_list; |
23 |
static int lru_size; |
24 |
static int lru_maxsize; |
25 |
|
26 |
#define lru_init lru_list.next = &lru_list; lru_list.prev = &lru_list /* other fields are zero */ |
27 |
|
28 |
/* this is primitive, yet effective */ |
29 |
/* the returned value must never be zero (or bad things will happen) */ |
30 |
#define lru_hash do { \ |
31 |
hash = (((U32)dbh)>>2); \ |
32 |
hash += *statement;\ |
33 |
hash += len; \ |
34 |
} while (0) |
35 |
|
36 |
/* fetch and "use" */ |
37 |
/* could be done using a single call (we could call prepare!) */ |
38 |
static SV *lru_fetch(SV *dbh, SV *sql) |
39 |
{ |
40 |
lru_node *n; |
41 |
|
42 |
U32 hash; |
43 |
STRLEN len; |
44 |
char *statement = SvPV (sql, len); |
45 |
|
46 |
dbh = SvRV (dbh); |
47 |
|
48 |
lru_hash; |
49 |
|
50 |
/*fprintf (stderr, "F: %08lx %s\n", hash, SvPV_nolen (sql));/*D*/ |
51 |
|
52 |
n = &lru_list; |
53 |
do { |
54 |
n = n->next; |
55 |
if (!n->hash) |
56 |
return 0; |
57 |
} while (n->hash != hash |
58 |
|| !sv_eq (n->sql, sql) |
59 |
|| n->dbh != dbh); |
60 |
|
61 |
/* found, so return to the start of the list */ |
62 |
n->prev->next = n->next; |
63 |
n->next->prev = n->prev; |
64 |
|
65 |
n->next = lru_list.next; |
66 |
n->prev = &lru_list; |
67 |
lru_list.next->prev = n; |
68 |
lru_list.next = n; |
69 |
|
70 |
return n->sth; |
71 |
} |
72 |
|
73 |
static void lru_nukeone(void) |
74 |
{ |
75 |
lru_node *n; |
76 |
/* nuke at the end */ |
77 |
|
78 |
n = lru_list.prev; |
79 |
|
80 |
lru_list.prev = n->prev; |
81 |
n->prev->next = &lru_list; |
82 |
|
83 |
/*fprintf (stderr, "N: %s\n", SvPV_nolen (n->sql));/*D*/ |
84 |
|
85 |
SvREFCNT_dec (n->dbh); |
86 |
SvREFCNT_dec (n->sql); |
87 |
SvREFCNT_dec (n->sth); |
88 |
Safefree (n); |
89 |
|
90 |
lru_size--; |
91 |
} |
92 |
|
93 |
/* store a not-yet existing entry(!) */ |
94 |
static void lru_store(SV *dbh, SV *sql, SV *sth) |
95 |
{ |
96 |
lru_node *n; |
97 |
|
98 |
U32 hash; |
99 |
STRLEN len; |
100 |
char *statement = SvPV (sql, len); |
101 |
|
102 |
dbh = SvRV (dbh); |
103 |
|
104 |
lru_hash; |
105 |
|
106 |
/*fprintf (stderr, "S: %08lx %s\n", hash, SvPV_nolen (sql));/*D*/ |
107 |
|
108 |
lru_size++; |
109 |
if (lru_size > lru_maxsize) |
110 |
lru_nukeone (); |
111 |
|
112 |
New (0, n, 1, lru_node); |
113 |
|
114 |
n->hash = hash; |
115 |
n->dbh = dbh; SvREFCNT_inc (dbh); /* note: this is the dbi hash itself, not the reference */ |
116 |
n->sql = newSVsv (sql); |
117 |
n->sth = sth; SvREFCNT_inc (sth); |
118 |
|
119 |
n->next = lru_list.next; |
120 |
n->prev = &lru_list; |
121 |
lru_list.next->prev = n; |
122 |
lru_list.next = n; |
123 |
} |
124 |
|
125 |
static void lru_cachesize (int size) |
126 |
{ |
127 |
if (size >= 0) |
128 |
{ |
129 |
lru_maxsize = size; |
130 |
while (lru_size > lru_maxsize) |
131 |
lru_nukeone (); |
132 |
} |
133 |
} |
134 |
|
135 |
static GV *sql_exec; |
136 |
static GV *DBH; |
137 |
|
138 |
MODULE = PApp::SQL PACKAGE = PApp::SQL |
139 |
|
140 |
PROTOTYPES: DISABLE |
141 |
|
142 |
BOOT: |
143 |
{ |
144 |
sql_exec = gv_fetchpv ("PApp::SQL::sql_exec", TRUE, SVt_PV); |
145 |
DBH = gv_fetchpv ("PApp::SQL::DBH" , TRUE, SVt_PV); |
146 |
|
147 |
/* apache might BOOT: twice :( */ |
148 |
if (lru_size) |
149 |
lru_cachesize (0); |
150 |
|
151 |
lru_init; |
152 |
lru_cachesize (50); |
153 |
} |
154 |
|
155 |
int |
156 |
cachesize(size = -1) |
157 |
int size |
158 |
CODE: |
159 |
RETVAL = lru_maxsize; |
160 |
lru_cachesize (size); |
161 |
OUTPUT: |
162 |
RETVAL |
163 |
|
164 |
void |
165 |
sql_exec(...) |
166 |
ALIAS: |
167 |
sql_fetch = 1 |
168 |
sql_fetchall = 2 |
169 |
sql_exists = 4 |
170 |
PPCODE: |
171 |
{ |
172 |
if (items == 0) |
173 |
croak ("Usage: sql_exec [database-handle,] [bind-var-refs,... ] \"sql-statement\", [arguments, ...]"); |
174 |
else |
175 |
{ |
176 |
int arg = 0; |
177 |
int bind_first, bind_last; |
178 |
int count; |
179 |
SV *dbh = ST(0); |
180 |
SV *sth; |
181 |
SV *sql; |
182 |
SV *execute; |
183 |
|
184 |
/* save our arguments against destruction through function calls */ |
185 |
SP += items; |
186 |
|
187 |
/* first check wether we should use an explicit db handle */ |
188 |
if (!is_dbh (dbh)) |
189 |
{ |
190 |
dbh = get_sv ("DBH", FALSE); |
191 |
if (!is_dbh (dbh)) |
192 |
{ |
193 |
dbh = GvSV(DBH); |
194 |
if (!is_dbh (dbh)) |
195 |
croak ("sql_exec: no $DBH found in current package or in PApp::SQL::"); |
196 |
} |
197 |
} |
198 |
else |
199 |
arg++; /* we consumed one argument */ |
200 |
|
201 |
/* count the remaining references (for bind_columns) */ |
202 |
bind_first = arg; |
203 |
while (items > arg && SvROK (ST(arg))) |
204 |
arg++; |
205 |
|
206 |
bind_last = arg; |
207 |
|
208 |
/* consume the sql-statement itself */ |
209 |
if (items <= arg) |
210 |
croak ("sql_exec: required argument \"sql-statement\" missing"); |
211 |
|
212 |
if (!SvPOK (ST(arg))) |
213 |
croak ("sql_exec: sql-statement must be a string"); |
214 |
|
215 |
sql = ST(arg); arg++; |
216 |
|
217 |
if (ix == 4) |
218 |
{ |
219 |
SV *neu = sv_2mortal (newSVpv ("select count(*) > 0 from ", 0)); |
220 |
sv_catsv (neu, sql); |
221 |
sv_catpv (neu, " limit 1"); |
222 |
sql = neu; |
223 |
ix = 1; /* sql_fetch */ |
224 |
} |
225 |
|
226 |
/* check cache for existing statement handle (NYI) */ |
227 |
sth = lru_fetch (dbh, sql); |
228 |
if (!sth) |
229 |
{ |
230 |
PUSHMARK (SP); |
231 |
EXTEND (SP, 2); |
232 |
PUSHs (dbh); |
233 |
PUSHs (sql); |
234 |
PUTBACK; |
235 |
count = call_method ("prepare", G_SCALAR); |
236 |
SPAGAIN; |
237 |
|
238 |
if (count != 1) |
239 |
croak ("sql_exec: unable to prepare() statement '%s': %s", |
240 |
SvPV_nolen (sql), |
241 |
SvPV_nolen (get_sv ("DBI::errstr", TRUE))); |
242 |
|
243 |
sth = POPs; |
244 |
|
245 |
lru_store (dbh, sql, sth); |
246 |
} |
247 |
|
248 |
PUSHMARK (SP); |
249 |
EXTEND (SP, items - arg + 1); |
250 |
PUSHs (sth); |
251 |
while (items > arg) |
252 |
{ |
253 |
PUSHs (ST(arg)); |
254 |
arg++; |
255 |
} |
256 |
|
257 |
PUTBACK; |
258 |
/* { static GV *execute; |
259 |
if (!execute) execute = gv_fetchmethod_autoload(SvSTASH(SvRV(sth)), "execute", 0); |
260 |
count = call_sv(GvCV(execute), G_SCALAR); |
261 |
}*/ |
262 |
count = call_method ("execute", G_SCALAR); |
263 |
SPAGAIN; |
264 |
|
265 |
if (count != 1) |
266 |
croak ("sql_exec: execute() didn't return any value ('%s'): %s", |
267 |
SvPV_nolen (sql), |
268 |
SvPV_nolen (get_sv ("DBI::errstr", TRUE))); |
269 |
|
270 |
execute = POPs; |
271 |
|
272 |
if (!SvTRUE (execute)) |
273 |
croak ("sql_exec: unable to execute statement '%s' (%s)", |
274 |
SvPV_nolen (sql), |
275 |
SvPV_nolen (get_sv ("DBI::errstr", TRUE))); |
276 |
|
277 |
sv_setsv (GvSV(sql_exec), execute); |
278 |
|
279 |
if (bind_first != bind_last) |
280 |
{ |
281 |
PUSHMARK (SP); |
282 |
EXTEND (SP, bind_last - bind_first + 2); |
283 |
PUSHs (sth); |
284 |
do { |
285 |
PUSHs (ST(bind_first)); |
286 |
bind_first++; |
287 |
} while (bind_first != bind_last); |
288 |
|
289 |
PUTBACK; |
290 |
count = call_method ("bind_columns", G_SCALAR); |
291 |
SPAGAIN; |
292 |
|
293 |
if (count != 1) |
294 |
croak ("sql_exec: bind_columns() didn't return any value ('%s'): %s", |
295 |
SvPV_nolen (sql), |
296 |
SvPV_nolen (get_sv ("DBI::errstr", TRUE))); |
297 |
|
298 |
if (!SvOK (POPs)) |
299 |
croak ("sql_exec: bind_columns() didn't return a true ('%s'): %s", |
300 |
SvPV_nolen (sql), |
301 |
SvPV_nolen (get_sv ("DBI::errstr", TRUE))); |
302 |
} |
303 |
|
304 |
/* free our arguments from the stack */ |
305 |
SP -= items; |
306 |
|
307 |
if (ix == 1) |
308 |
{ /* sql_fetch */ |
309 |
SV *row; |
310 |
|
311 |
PUSHMARK (SP); |
312 |
XPUSHs (sth); |
313 |
PUTBACK; |
314 |
count = call_method ("fetchrow_arrayref", G_SCALAR); |
315 |
SPAGAIN; |
316 |
|
317 |
if (count != 1) |
318 |
abort (); |
319 |
|
320 |
row = POPs; |
321 |
|
322 |
if (SvROK (row)) |
323 |
{ |
324 |
AV *av; |
325 |
|
326 |
switch (GIMME_V) |
327 |
{ |
328 |
case G_VOID: |
329 |
/* no thing */ |
330 |
break; |
331 |
case G_SCALAR: |
332 |
/* the first element */ |
333 |
XPUSHs (*av_fetch ((AV *)SvRV (row), 0, 1)); |
334 |
break; |
335 |
case G_ARRAY: |
336 |
av = (AV *)SvRV (row); |
337 |
count = AvFILL (av) + 1; |
338 |
EXTEND (SP, count); |
339 |
for (arg = 0; arg < count; arg++) |
340 |
PUSHs (AvARRAY (av)[arg]); |
341 |
|
342 |
break; |
343 |
default: |
344 |
abort (); |
345 |
} |
346 |
} |
347 |
} |
348 |
else if (ix == 2) |
349 |
{ /* sql_fetchall */ |
350 |
SV *rows; |
351 |
|
352 |
PUSHMARK (SP); |
353 |
XPUSHs (sth); |
354 |
PUTBACK; |
355 |
count = call_method ("fetchall_arrayref", G_SCALAR); |
356 |
SPAGAIN; |
357 |
|
358 |
if (count != 1) |
359 |
abort (); |
360 |
|
361 |
rows = POPs; |
362 |
|
363 |
if (SvROK (rows)) |
364 |
{ |
365 |
AV *av = (AV *)SvRV (rows); |
366 |
count = AvFILL (av) + 1; |
367 |
|
368 |
if (count) |
369 |
{ |
370 |
int columns = AvFILL ((AV *)SvRV (AvARRAY(av)[0])) + 1; /* columns? */ |
371 |
|
372 |
EXTEND (SP, count); |
373 |
if (columns == 1) |
374 |
for (arg = 0; arg < count; arg++) |
375 |
PUSHs (AvARRAY ((AV *)SvRV (AvARRAY (av)[arg]))[0]); |
376 |
else |
377 |
for (arg = 0; arg < count; arg++) |
378 |
PUSHs (AvARRAY (av)[arg]); |
379 |
} |
380 |
} |
381 |
} |
382 |
else |
383 |
XPUSHs (sth); |
384 |
|
385 |
if (ix || GIMME_V == G_VOID) |
386 |
{ |
387 |
PUSHMARK (SP); |
388 |
XPUSHs (sth); |
389 |
PUTBACK; |
390 |
(void) call_method ("finish", G_DISCARD); |
391 |
SPAGAIN; |
392 |
} |
393 |
} |
394 |
} |
395 |
|
396 |
|
397 |
|