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1.1 parser 1: /** @file
2: Parser PgSQL driver.
3:
1.12 paf 4: Copyright(c) 2001, 2003 ArtLebedev Group (http://www.artlebedev.com)
1.1 parser 5:
1.6 paf 6: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.1 parser 7:
8: 2001.07.30 using PgSQL 7.1.2
9: */
1.12.6.2! paf 10: static const char *RCSId="$Id: parser3pgsql.C,v 1.12.6.1 2003/03/26 14:09:06 paf Exp $";
1.1 parser 11:
12: #include "config_includes.h"
13:
14: #include "pa_sql_driver.h"
15:
16: #include <libpq-fe.h>
17: #include <libpq/libpq-fs.h>
18:
19: // OIDOID from catalog/pg_type.h
20: #define OIDOID 26
21: // LO_BUFSIZE from interfaces\libpq\fe-lobj.c = 8192 (0x2000)
22: // actually writing chunks of that size failed, reduced it twice
23: #define LO_BUFSIZE 0x1000
24: // from postgres_ext.h
25: #define InvalidOid ((Oid) 0)
26:
27:
28: #include "ltdl.h"
29:
30: #define MAX_STRING 0x400
31: #define MAX_NUMBER 20
32:
33: #if _MSC_VER
34: # define snprintf _snprintf
35: # define strcasecmp _stricmp
36: #endif
37:
38: #ifndef max
39: inline int max(int a,int b) { return a>b?a:b; }
40: inline int min(int a,int b){ return a<b?a:b; }
41: #endif
42:
43: static char *lsplit(char *string, char delim) {
44: if(string) {
45: char *v=strchr(string, delim);
46: if(v) {
47: *v=0;
48: return v+1;
49: }
50: }
51: return 0;
52: }
53:
1.8 paf 54: static char *lsplit(char **string_ref, char delim) {
55: char *result=*string_ref;
56: char *next=lsplit(*string_ref, delim);
57: *string_ref=next;
58: return result;
59: }
60:
1.1 parser 61: /**
62: PgSQL server driver
63: */
64: class PgSQL_Driver : public SQL_Driver {
65: public:
66:
67: PgSQL_Driver() : SQL_Driver() {
68: }
69:
70: /// get api version
71: int api_version() { return SQL_DRIVER_API_VERSION; }
72: /// initialize driver by loading sql dynamic link library
1.3 paf 73: const char *initialize(char *dlopen_file_spec) {
1.1 parser 74: return dlopen_file_spec?
75: dlink(dlopen_file_spec):"client library column is empty";
76: }
77:
78: #define throwPQerror services._throw(PQerrorMessage(conn))
1.8 paf 79: #define PQclear_throw(msg) { \
80: PQclear(res); \
81: services._throw(msg); \
82: }
83: #define PQclear_throwPQerror PQclear_throw(PQerrorMessage(conn))
1.1 parser 84:
85: /** connect
86: @param used_only_in_connect_url
87: format: @b user:pass@host[:port]|[local]/database
88: */
89: void connect(
90: char *used_only_in_connect_url,
91: SQL_Driver_services& services,
92: void **connection ///< output: PGconn *
93: ) {
94: char *user=used_only_in_connect_url;
95: char *host=lsplit(user, '@');
96: char *db=lsplit(host, '/');
97: char *pwd=lsplit(user, ':');
98: char *port=lsplit(host, ':');
99:
1.8 paf 100: char *options=lsplit(db, '?');
101:
1.1 parser 102: PGconn *conn=PQsetdbLogin(
1.7 paf 103: (host&&strcasecmp(host, "local")==0)?NULL/* local Unix domain socket */:host, port,
1.1 parser 104: NULL, NULL, db, user, pwd);
105: if(!conn)
106: services._throw("PQsetdbLogin failed");
107: if(PQstatus(conn)!=CONNECTION_OK)
108: throwPQerror;
109:
1.8 paf 110: char *charset=0;
111: char *datestyle=0;
112:
113: while(options) {
114: if(char *key=lsplit(&options, '&')) {
115: if(*key) {
116: if(char *value=lsplit(key, '=')) {
117: if(strcasecmp(key, "charset")==0) {
118: charset=value;
119: } else if(strcasecmp(key, "datestyle")==0) {
120: datestyle=value;
121: } else
122: services._throw("unknown connect option" /*key*/);
123: } else
124: services._throw("connect option without =value" /*key*/);
125: }
126: }
127: }
128:
129: if(charset) {
130: // set CLIENT_ENCODING
131: char statement[MAX_STRING]="set CLIENT_ENCODING="; // win
132: strncat(statement, charset, MAX_STRING);
133:
134: PGresult *res=PQexec(conn, statement);
135: if(!res)
136: throwPQerror;
137: PQclear(res); // throw out the result [don't need but must call]
138: }
139:
140: if(datestyle) {
141: // set DATESTYLE
142: char statement[MAX_STRING]="set DATESTYLE="; // ISO,SQL,Postgres,European,NonEuropean=US,German,DEFAULT=ISO
143: strncat(statement, charset, MAX_STRING);
144:
145: PGresult *res=PQexec(conn, statement);
146: if(!res)
147: throwPQerror;
148: PQclear(res); // throw out the result [don't need but must call]
149: }
150:
1.1 parser 151: *(PGconn **)connection=conn;
152: begin_transaction(services, conn);
153: }
154: void disconnect(void *connection) {
155: PQfinish((PGconn *)connection);
156: }
157: void commit(SQL_Driver_services& services, void *connection) {
158: PGconn *conn=(PGconn *)connection;
159: if(PGresult *res=PQexec(conn, "COMMIT"))
160: PQclear(res);
161: else
162: throwPQerror;
163: begin_transaction(services, conn);
164: }
165: void rollback(SQL_Driver_services& services, void *connection) {
166: PGconn *conn=(PGconn *)connection;
167: if(PGresult *res=PQexec(conn, "ROLLBACK"))
168: PQclear(res);
169: else
170: throwPQerror;
171: begin_transaction(services, conn);
172: }
173:
174: bool ping(SQL_Driver_services&, void *connection) {
175: return PQstatus((PGconn *)connection)==CONNECTION_OK;
176: }
177:
1.12.6.1 paf 178: const char* quote(
179: SQL_Driver_services& services, void *connection,
180: const char *from, unsigned int length) {
181: char *result=(char*)services.malloc_atomic(length*2+1);
182: char *to=result;
183: while(length--) {
184: switch(*from) {
185: case '\'': // "'" -> "''"
186: *to++='\''; result++;
187: break;
188: case '\\': // "\" -> "\\"
189: *to++='\\'; result++;
190: break;
1.1 parser 191: }
1.12.6.1 paf 192: *to++=*from++;
193: }
194: *to=0;
195: return result;
196: }
1.1 parser 197: void query(
198: SQL_Driver_services& services, void *connection,
199: const char *astatement, unsigned long offset, unsigned long limit,
200: SQL_Driver_query_event_handlers& handlers) {
201: // _asm int 3;
202:
203: PGconn *conn=(PGconn *)connection;
204:
205: const char *statement=preprocess_statement(services, conn,
206: astatement, offset, limit);
207:
208: PGresult *res=PQexec(conn, statement);
209: if(!res)
210: throwPQerror;
211:
212: switch(PQresultStatus(res)) {
213: case PGRES_EMPTY_QUERY:
214: PQclear_throw("no query");
215: break;
216: case PGRES_COMMAND_OK:
217: // empty result: insert|delete|update|...
218: PQclear(res);
219: return;
220: case PGRES_TUPLES_OK:
221: break;
222: default:
223: PQclear_throwPQerror;
224: break;
225: }
226:
227: int column_count=PQnfields(res);
228: if(!column_count)
229: PQclear_throw("result contains no columns");
230:
1.9 paf 231: bool failed=false;
232: SQL_Error sql_error;
233: #define CHECK(afailed) \
234: if(afailed) { \
235: failed=true; \
236: goto cleanup; \
237: }
238:
1.1 parser 239: for(int i=0; i<column_count; i++){
240: char *name=PQfname(res, i);
241: size_t size=strlen(name);
1.12.6.2! paf 242: char* str=(char*)services.malloc(size+1);
! 243: memcpy(str, name, size+1);
! 244: CHECK(handlers.add_column(sql_error, str, size));
1.1 parser 245: }
246:
1.9 paf 247: CHECK(handlers.before_rows(sql_error));
1.1 parser 248:
249: if(unsigned long row_count=(unsigned long)PQntuples(res))
250: for(unsigned long r=0; r<row_count; r++) {
1.9 paf 251: CHECK(handlers.add_row(sql_error));
1.1 parser 252: for(int i=0; i<column_count; i++){
253: const char *cell=PQgetvalue(res, r, i);
254: size_t size;
1.12.6.2! paf 255: char* str;
1.1 parser 256: if(PQftype(res, i)==OIDOID) {
257: // ObjectID column, read object bytes
258:
259: char *error_pos=0;
260: Oid oid=cell?atoi(cell):0;
261: int fd=lo_open(conn, oid, INV_READ);
262: if(fd>=0) {
263: // seek to end
264: if(lo_lseek(conn, fd, 0, SEEK_END)<0)
265: PQclear_throwPQerror;
266: // get size
267: int size_tell=lo_tell(conn, fd);
268: if(size_tell<0)
269: PQclear_throwPQerror;
270: // seek to begin
271: if(lo_lseek(conn, fd, 0, SEEK_SET)<0)
272: PQclear_throwPQerror;
273: size=(size_t)size_tell;
274: if(size) {
275: // read
1.12.6.2! paf 276: str=(char*)services.malloc(size+1);
! 277: if(!lo_read_ex(conn, fd, str, size_tell))
1.1 parser 278: PQclear_throw("lo_read can not read all bytes of object");
279: } else
1.12.6.2! paf 280: str=0;
1.1 parser 281: if(lo_close(conn, fd)<0)
282: PQclear_throwPQerror;
283: } else
284: PQclear_throwPQerror;
285: } else {
286: // normal column, read it normally
287: size=(size_t)PQgetlength(res, r, i);
288: if(size) {
1.12.6.2! paf 289: str=(char*)services.malloc(size+1);
! 290: memcpy(str, cell, size+1);
1.1 parser 291: } else
1.12.6.2! paf 292: str=0;
1.1 parser 293: }
1.12.6.2! paf 294: CHECK(handlers.add_row_cell(sql_error, str, size));
1.1 parser 295: }
296: }
1.9 paf 297: cleanup:
1.1 parser 298: PQclear(res);
1.9 paf 299: if(failed)
300: services._throw(sql_error);
1.1 parser 301: }
302:
303: private: // private funcs
304:
305: void begin_transaction(SQL_Driver_services& services, PGconn *conn) {
306: if(PGresult *res=PQexec(conn, "BEGIN"))
307: PQclear(res);
308: else
309: throwPQerror;
310: }
311:
312: const char *preprocess_statement(SQL_Driver_services& services, PGconn *conn,
313: const char *astatement, unsigned long offset, unsigned long limit) {
314: size_t statement_size=strlen(astatement);
315:
316: char *result=(char *)services.malloc(statement_size
317: +MAX_NUMBER*2+15 // limit # offset #
318: +MAX_STRING // in case of short 'strings'
319: +1);
320: // offset & limit -> suffixes
321: const char *o;
322: if(offset || limit) {
323: char *cur=result;
324: memcpy(cur, astatement, statement_size); cur+=statement_size;
325: if(limit)
326: cur+=snprintf(cur, 7+MAX_NUMBER, " limit %u", limit);
327: if(offset)
328: cur+=snprintf(cur, 8+MAX_NUMBER, " offset %u", offset);
329: o=result;
330: } else
331: o=astatement;
332:
333: // /**xxx**/'literal' -> oid
334: char *n=result;
335: while(*o) {
336: if(
337: o[0]=='/' &&
338: o[1]=='*' &&
339: o[2]=='*') { // name start
340: o+=3;
341: while(*o)
342: if(
343: o[0]=='*' &&
344: o[1]=='*' &&
345: o[2]=='/' &&
346: o[3]=='\'') { // name end
347: o+=4;
348: Oid oid=lo_creat(conn, INV_READ|INV_WRITE);
349: if(oid==InvalidOid)
350: throwPQerror;
351: int fd=lo_open(conn, oid, INV_WRITE);
352: if(fd>=0) {
353: const char *start=o;
354: bool escaped=false;
355: while(*o && !(o[0]=='\'' && o[1]!='\'' && !escaped)) {
356: escaped=*o=='\\' || (o[0]=='\'' && o[1]=='\'');
357: if(escaped) {
358: // write pending, skip "\" or "'"
359: if(!lo_write_ex(conn, fd, start, o-start))
360: services._throw("lo_write could not write all bytes of object (1)");
361: start=++o;
362: } else
363: o++;
364: }
365: if(!lo_write_ex(conn, fd, start, o-start))
366: services._throw("lo_write can not write all bytes of object (2)");
367: if(lo_close(conn, fd)<0)
368: throwPQerror;
369: } else
370: throwPQerror;
371: if(*o)
372: o++; // skip "'"
373:
374: n+=snprintf(n, MAX_NUMBER, "%u", oid);
375: break;
376: } else
377: o++; // /**skip**/'xxx'
378: } else
379: *n++=*o++;
380: }
381: *n=0;
382:
383: return result;
384: }
385:
386: private: // lo_read/write exchancements
387:
388: bool lo_read_ex(PGconn *conn, int fd, const/*paf*/ char *buf, size_t len) {
389: int size_read;
390: while(len && (size_read=lo_read(conn, fd, buf, min(LO_BUFSIZE, len)))>0) {
391: buf+=size_read;
392: len-=size_read;
393: }
394: return len==0;
395: }
396:
397: bool lo_write_ex(PGconn *conn, int fd, const/*paf*/ char *buf, size_t len) {
398: int size_written;
399: while(len && (size_written=lo_write(conn, fd, buf, min(LO_BUFSIZE, len)))>0) {
400: buf+=size_written;
401: len-=size_written;
402: }
403: return len==0;
404: }
405:
406: private: // conn client library funcs
407:
408: typedef PGconn* (*t_PQsetdbLogin)(
409: const char *pghost,
410: const char *pgport,
411: const char *pgoptions,
412: const char *pgtty,
413: const char *dbName,
414: const char *login,
415: const char *pwd); t_PQsetdbLogin PQsetdbLogin;
416: typedef void (*t_PQfinish)(PGconn *conn); t_PQfinish PQfinish;
417: typedef char *(*t_PQerrorMessage)(const PGconn* conn); t_PQerrorMessage PQerrorMessage;
418: typedef ConnStatusType (*t_PQstatus)(const PGconn *conn); t_PQstatus PQstatus;
419: typedef PGresult *(*t_PQexec)(PGconn *conn,
420: const char *query); t_PQexec PQexec;
421: typedef ExecStatusType (*t_PQresultStatus)(const PGresult *res); t_PQresultStatus PQresultStatus;
422: typedef int (*t_PQgetlength)(const PGresult *res,
423: int tup_num,
424: int field_num); t_PQgetlength PQgetlength;
425: typedef char* (*t_PQgetvalue)(const PGresult *res,
426: int tup_num,
427: int field_num); t_PQgetvalue PQgetvalue;
428: typedef int (*t_PQntuples)(const PGresult *res); t_PQntuples PQntuples;
429: typedef char *(*t_PQfname)(const PGresult *res,
430: int field_index); t_PQfname PQfname;
431: typedef int (*t_PQnfields)(const PGresult *res); t_PQnfields PQnfields;
432: typedef void (*t_PQclear)(PGresult *res); t_PQclear PQclear;
433:
434: typedef Oid (*t_PQftype)(const PGresult *res, int field_num); t_PQftype PQftype;
435:
436: typedef int (*t_lo_open)(PGconn *conn, Oid lobjId, int mode); t_lo_open lo_open;
437: typedef int (*t_lo_close)(PGconn *conn, int fd); t_lo_close lo_close;
438: typedef int (*t_lo_read)(PGconn *conn, int fd, const/*paf*/ char *buf, size_t len); t_lo_read lo_read;
439: typedef int (*t_lo_write)(PGconn *conn, int fd, const/*paf*/ char *buf, size_t len); t_lo_write lo_write;
440: typedef int (*t_lo_lseek)(PGconn *conn, int fd, int offset, int whence); t_lo_lseek lo_lseek;
441: typedef Oid (*t_lo_creat)(PGconn *conn, int mode); t_lo_creat lo_creat;
442: typedef int (*t_lo_tell)(PGconn *conn, int fd); t_lo_tell lo_tell;
443: typedef int (*t_lo_unlink)(PGconn *conn, Oid lobjId); t_lo_unlink lo_unlink;
444: typedef Oid (*t_lo_import)(PGconn *conn, const char *filename); t_lo_import lo_import;
445: typedef int (*t_lo_export)(PGconn *conn, Oid lobjId, const char *filename); t_lo_export lo_export;
446:
447: private: // conn client library funcs linking
448:
449: const char *dlink(const char *dlopen_file_spec) {
1.11 paf 450: if(lt_dlinit())
451: return lt_dlerror();
1.1 parser 452: lt_dlhandle handle=lt_dlopen(dlopen_file_spec);
453: if(!handle)
454: return "can not open the dynamic link module";
455:
456: #define DSLINK(name, action) \
457: name=(t_##name)lt_dlsym(handle, #name); \
458: if(!name) \
459: action;
460:
461: #define DLINK(name) DSLINK(name, return "function " #name " was not found")
462:
463: DLINK(PQsetdbLogin);
464: DLINK(PQerrorMessage);
465: DLINK(PQstatus);
466: DLINK(PQfinish);
467: DLINK(PQgetvalue);
468: DLINK(PQgetlength);
469: DLINK(PQntuples);
470: DLINK(PQfname);
471: DLINK(PQnfields);
472: DLINK(PQclear);
473: DLINK(PQresultStatus);
474: DLINK(PQexec);
475: DLINK(PQftype);
476: DLINK(lo_open); DLINK(lo_close);
477: DLINK(lo_read); DLINK(lo_write);
478: DLINK(lo_lseek); DLINK(lo_creat);
479: DLINK(lo_tell); DLINK(lo_unlink);
480: DLINK(lo_import); DLINK(lo_export);
481:
482: return 0;
483: }
484:
485: };
486:
487: extern "C" SQL_Driver *SQL_DRIVER_CREATE() {
488: return new PgSQL_Driver();
1.2 paf 489: }