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1.1 parser 1: /** @file
2: Parser PgSQL driver.
3:
4: Copyright(c) 2001 ArtLebedev Group(http://www.artlebedev.com)
5:
6: Author: Alexander Petrosyan <paf@design.ru>(http://design.ru/paf)
7:
8: 2001.07.30 using PgSQL 7.1.2
9: */
1.6 ! parser 10: static const char *RCSId="$Id: parser3pgsql.C,v 1.5 2001/07/31 12:51:45 parser Exp $";
1.1 parser 11:
12: #include "config_includes.h"
13:
14: #include "pa_sql_driver.h"
15:
16: #include <libpq-fe.h>
1.4 parser 17: #include <libpq-fs.h>
18:
19: // #include <catalog/pg_type.h>
20: #define OIDOID 26
21: #define LO_BUFSIZE 8192
22:
23:
1.1 parser 24: #include "ltdl.h"
25:
26: #define MAX_STRING 0x400
27: #define MAX_NUMBER 20
28:
29: #if _MSC_VER
30: # define snprintf _snprintf
31: # define strcasecmp _stricmp
32: #endif
33:
1.4 parser 34: #ifndef max
35: inline int max(int a,int b) { return a>b?a:b; }
36: inline int min(int a,int b){ return a<b?a:b; }
37: #endif
38:
1.1 parser 39: static char *lsplit(char *string, char delim) {
40: if(string) {
41: char *v=strchr(string, delim);
42: if(v) {
43: *v=0;
44: return v+1;
45: }
46: }
47: return 0;
48: }
49:
50: /**
51: PgSQL server driver
52: */
53: class PgSQL_Driver : public SQL_Driver {
54: public:
55:
56: PgSQL_Driver() : SQL_Driver() {
57: }
58:
59: /// get api version
60: int api_version() { return SQL_DRIVER_API_VERSION; }
61: /// initialize driver by loading sql dynamic link library
62: const char *initialize(const char *dlopen_file_spec) {
63: return dlopen_file_spec?
64: dlink(dlopen_file_spec):"client library column is empty";
65: }
66: /** connect
67: @param used_only_in_connect_url
68: format: @b user:pass@host[:port]|[local]/database
69: 3.23.22b
70: Currently the only option for @b character_set_name is cp1251_koi8.
71: WARNING: must be used only to connect, for buffer doesn't live long
72: */
73: void connect(
74: char *used_only_in_connect_url,
75: SQL_Driver_services& services,
76: void **connection ///< output: PGconn *
77: ) {
78: char *user=used_only_in_connect_url;
79: char *host=lsplit(user, '@');
80: char *db=lsplit(host, '/');
81: char *pwd=lsplit(user, ':');
82: char *port=lsplit(host, ':');
83:
84: // _asm int 3;
1.4 parser 85: PGconn *conn=PQsetdbLogin(
1.1 parser 86: strcasecmp(host, "local")==0?NULL/* local Unix domain socket */:host, port,
87: NULL, NULL, db, user, pwd);
1.4 parser 88: if(!conn)
1.1 parser 89: services._throw("PQsetdbLogin failed");
1.4 parser 90: if(PQstatus(conn)!=CONNECTION_OK)
91: services._throw(PQerrorMessage(conn));
1.1 parser 92:
1.4 parser 93: *(PGconn **)connection=conn;
94: begin_transaction(services, conn);
1.1 parser 95: }
96: void disconnect(SQL_Driver_services&, void *connection) {
1.4 parser 97: // _asm int 3;
1.1 parser 98: PQfinish((PGconn *)connection);
99: }
1.4 parser 100: void commit(SQL_Driver_services& services, void *connection) {
101: // _asm int 3;
102: PGconn *conn=(PGconn *)connection;
103: if(PGresult *res=PQexec(conn, "COMMIT"))
104: PQclear(res);
105: else
106: services._throw(PQerrorMessage(conn));
107: begin_transaction(services, conn);
108: }
109: void rollback(SQL_Driver_services& services, void *connection) {
110: // _asm int 3;
111: PGconn *conn=(PGconn *)connection;
112: if(PGresult *res=PQexec(conn, "ROLLBACK"))
113: PQclear(res);
114: else
115: services._throw(PQerrorMessage(conn));
116: begin_transaction(services, conn);
117: }
1.1 parser 118:
119: bool ping(SQL_Driver_services&, void *connection) {
120: return PQstatus((PGconn *)connection)==CONNECTION_OK;
121: }
122:
123: unsigned int quote(
124: SQL_Driver_services&, void *connection,
125: char *to, const char *from, unsigned int length) {
126: /*
127: it's already UNTAINT_TIMES_BIGGER
128: */
129: unsigned int result=length;
130: while(length--) {
1.3 parser 131: switch(*from) {
132: case '\'': // "'" -> "''"
1.1 parser 133: *to++='\'';
1.3 parser 134: break;
135: case '\\': // "\" -> "\\"
136: *to++='\'';
137: break;
138: }
1.1 parser 139: *to++=*from++;
140: }
141: return result;
142: }
143: void query(
144: SQL_Driver_services& services, void *connection,
145: const char *astatement, unsigned long offset, unsigned long limit,
146: SQL_Driver_query_event_handlers& handlers) {
1.6 ! parser 147: // _asm int 3;
1.1 parser 148:
1.4 parser 149: PGconn *conn=(PGconn *)connection;
1.5 parser 150: #define PQclear_throw(msg) { \
151: PQclear(res); \
152: services._throw(msg); \
1.6 ! parser 153: }
! 154: #define PQclear_throwPQerror PQclear_throw(PQerrorMessage(conn))
1.1 parser 155:
1.6 ! parser 156: const char *statement=preprocess_statement(services, conn,
! 157: astatement, offset, limit);
1.1 parser 158:
1.4 parser 159: PGresult *res=PQexec(conn, statement);
1.1 parser 160: if(!res)
1.4 parser 161: services._throw(PQerrorMessage(conn));
1.1 parser 162:
163: switch(PQresultStatus(res)) {
164: case PGRES_EMPTY_QUERY:
1.5 parser 165: PQclear_throw("no query");
1.1 parser 166: break;
167: case PGRES_COMMAND_OK:
168: // empty result: insert|delete|update|...
1.6 ! parser 169: PQclear(res);
1.1 parser 170: return;
171: case PGRES_TUPLES_OK:
172: break;
173: default:
1.6 ! parser 174: PQclear_throwPQerror;
1.1 parser 175: break;
176: }
177:
178: int column_count=PQnfields(res);
1.5 parser 179: if(!column_count)
180: PQclear_throw("result contains no columns");
1.1 parser 181:
182: for(int i=0; i<column_count; i++){
183: char *name=PQfname(res, i);
184: size_t size=strlen(name);
185: void *ptr=services.malloc(size);
186: memcpy(ptr, name, size);
187: handlers.add_column(ptr, size);
188: }
189:
190: handlers.before_rows();
1.4 parser 191:
1.1 parser 192: if(unsigned long row_count=(unsigned long)PQntuples(res))
193: for(unsigned long r=0; r<row_count; r++) {
194: handlers.add_row();
195: for(int i=0; i<column_count; i++){
1.4 parser 196: const char *cell=PQgetvalue(res, r, i);
197: size_t size;
1.1 parser 198: void *ptr;
1.4 parser 199: if(PQftype(res, i)==OIDOID) {
200: // ObjectID column, read object bytes
201: // _asm int 3;
202:
203: char *error_pos=0;
204: Oid oid=cell?atoi(cell):0;
205: int fd=lo_open(conn, oid, INV_READ);
206: if(fd>=0) {
207: // seek to end
208: if(lo_lseek(conn, fd, 0, SEEK_END)<0)
1.5 parser 209: PQclear_throwPQerror;
1.4 parser 210: // get size
211: int size_tell=lo_tell(conn, fd);
212: if(size_tell<0)
1.5 parser 213: PQclear_throwPQerror;
1.4 parser 214: // seek to begin
215: if(lo_lseek(conn, fd, 0, SEEK_SET)<0)
1.5 parser 216: PQclear_throwPQerror;
1.4 parser 217: size=(size_t)size_tell;
218: if(size) {
219: // read
220: ptr=services.malloc(size);
221: char *buf=(char *)ptr;
222: int countdown=size_tell;
223: int size_read;
224: while(countdown && (size_read=lo_read(conn, fd, buf, min(LO_BUFSIZE, countdown)))>0) {
225: buf+=size_read;
226: countdown-=size_read;
227: }
1.5 parser 228: if(countdown)
229: PQclear_throw("lo_read can not read all bytes of object");
1.4 parser 230: } else
231: ptr=0;
232: if(lo_close(conn, fd)<0)
1.5 parser 233: PQclear_throwPQerror;
1.4 parser 234: } else
1.5 parser 235: PQclear_throwPQerror;
1.4 parser 236: } else {
237: // normal column, read it as ASCII string
238: size=(size_t)PQgetlength(res, r, i);
239: if(size) {
240: ptr=services.malloc(size);
241: memcpy(ptr, cell, size);
242: } else
243: ptr=0;
244: }
1.1 parser 245: handlers.add_row_cell(ptr, size);
246: }
247: }
248:
249: PQclear(res);
250: }
251:
1.4 parser 252: private: // private funcs
253:
254: void begin_transaction(SQL_Driver_services& services, PGconn *conn) {
255: if(PGresult *res=PQexec(conn, "BEGIN"))
256: PQclear(res);
257: else
258: services._throw(PQerrorMessage(conn));
259: }
260:
1.6 ! parser 261: const char *preprocess_statement(SQL_Driver_services& services, PGconn *conn,
! 262: const char *astatement, unsigned long offset, unsigned long limit) {
! 263: size_t statement_size=strlen(astatement);
! 264: //_asm int 3;
! 265:
! 266: char *result=(char *)services.malloc(statement_size
! 267: +MAX_NUMBER*2+15 // limit # offset #
! 268: +MAX_STRING // in case of short 'strings'
! 269: +1);
! 270: // offset & limit -> suffixes
! 271: const char *o;
! 272: if(offset || limit) {
! 273: char *cur=result;
! 274: memcpy(cur, astatement, statement_size); cur+=statement_size;
! 275: if(limit)
! 276: cur+=snprintf(cur, 7+MAX_NUMBER, " limit %u", limit);
! 277: if(offset)
! 278: cur+=snprintf(cur, 8+MAX_NUMBER, " offset %u", offset);
! 279: o=result;
! 280: } else
! 281: o=astatement;
! 282:
! 283: // /*:zzzz*/'literal' -> oid
! 284: char *n=result;
! 285: while(*o) {
! 286: if(
! 287: o[0]=='/' &&
! 288: o[1]=='*' &&
! 289: o[2]==':') { // name start
! 290: o+=3;
! 291: while(*o)
! 292: if(
! 293: o[0]=='*' &&
! 294: o[1]=='/' &&
! 295: o[2]=='\'') { // name end
! 296: o+=3;
! 297: Oid oid=lo_creat(conn, INV_READ|INV_WRITE);
! 298: int fd=lo_open(conn, oid, INV_WRITE);
! 299: const char *start=o;
! 300: bool escaped=false;
! 301: while(*o && !(o[0]=='\'' && o[1]!='\'' && !escaped)) {
! 302: escaped=*o=='\\' || (o[0]=='\'' && o[1]=='\'');
! 303: if(escaped) {
! 304: // write pending, skip "\" or "'"
! 305: if(o!=start)
! 306: lo_write(conn, fd, start, o-start);
! 307: start=++o;
! 308: } else
! 309: o++;
! 310: }
! 311: if(o!=start)
! 312: lo_write(conn, fd, start, o-start);
! 313: lo_close(conn, fd);
! 314: if(*o)
! 315: o++; // skip "'"
! 316:
! 317: n+=snprintf(n, MAX_NUMBER, "%u", oid);
! 318: break;
! 319: } else
! 320: o++; // /*:skip*/
! 321: } else
! 322: *n++=*o++;
! 323: }
! 324: *n=0;
! 325:
! 326: return result;
! 327: }
! 328:
1.4 parser 329: private: // conn client library funcs
1.1 parser 330:
331: typedef PGconn* (*t_PQsetdbLogin)(
332: const char *pghost,
333: const char *pgport,
334: const char *pgoptions,
335: const char *pgtty,
336: const char *dbName,
337: const char *login,
338: const char *pwd); t_PQsetdbLogin PQsetdbLogin;
339: typedef void (*t_PQfinish)(PGconn *conn); t_PQfinish PQfinish;
340: typedef char *(*t_PQerrorMessage)(const PGconn* conn); t_PQerrorMessage PQerrorMessage;
341: typedef ConnStatusType (*t_PQstatus)(const PGconn *conn); t_PQstatus PQstatus;
342: typedef PGresult *(*t_PQexec)(PGconn *conn,
343: const char *query); t_PQexec PQexec;
344: typedef ExecStatusType (*t_PQresultStatus)(const PGresult *res); t_PQresultStatus PQresultStatus;
345: typedef int (*t_PQgetlength)(const PGresult *res,
346: int tup_num,
347: int field_num); t_PQgetlength PQgetlength;
348: typedef char* (*t_PQgetvalue)(const PGresult *res,
349: int tup_num,
350: int field_num); t_PQgetvalue PQgetvalue;
351: typedef int (*t_PQntuples)(const PGresult *res); t_PQntuples PQntuples;
352: typedef char *(*t_PQfname)(const PGresult *res,
353: int field_index); t_PQfname PQfname;
354: typedef int (*t_PQnfields)(const PGresult *res); t_PQnfields PQnfields;
355: typedef void (*t_PQclear)(PGresult *res); t_PQclear PQclear;
356:
1.4 parser 357: typedef Oid (*t_PQftype)(const PGresult *res, int field_num); t_PQftype PQftype;
358:
359: typedef int (*t_lo_open)(PGconn *conn, Oid lobjId, int mode); t_lo_open lo_open;
360: typedef int (*t_lo_close)(PGconn *conn, int fd); t_lo_close lo_close;
1.6 ! parser 361: typedef int (*t_lo_read)(PGconn *conn, int fd, const/*paf*/ char *buf, size_t len); t_lo_read lo_read;
! 362: typedef int (*t_lo_write)(PGconn *conn, int fd, const/*paf*/ char *buf, size_t len); t_lo_write lo_write;
1.4 parser 363: typedef int (*t_lo_lseek)(PGconn *conn, int fd, int offset, int whence); t_lo_lseek lo_lseek;
364: typedef Oid (*t_lo_creat)(PGconn *conn, int mode); t_lo_creat lo_creat;
365: typedef int (*t_lo_tell)(PGconn *conn, int fd); t_lo_tell lo_tell;
366: typedef int (*t_lo_unlink)(PGconn *conn, Oid lobjId); t_lo_unlink lo_unlink;
367: typedef Oid (*t_lo_import)(PGconn *conn, const char *filename); t_lo_import lo_import;
368: typedef int (*t_lo_export)(PGconn *conn, Oid lobjId, const char *filename); t_lo_export lo_export;
1.1 parser 369:
1.4 parser 370: private: // conn client library funcs linking
1.1 parser 371:
372: const char *dlink(const char *dlopen_file_spec) {
373: lt_dlhandle handle=lt_dlopen(dlopen_file_spec);
374: if(!handle)
375: return "can not open the dynamic link module";
376:
377: #define DSLINK(name, action) \
378: name=(t_##name)lt_dlsym(handle, #name); \
379: if(!name) \
380: action;
381:
382: #define DLINK(name) DSLINK(name, return "function " #name " was not found")
383:
384: DLINK(PQsetdbLogin);
385: DLINK(PQerrorMessage);
386: DLINK(PQstatus);
387: DLINK(PQfinish);
388: DLINK(PQgetvalue);
389: DLINK(PQgetlength);
390: DLINK(PQntuples);
391: DLINK(PQfname);
392: DLINK(PQnfields);
393: DLINK(PQclear);
394: DLINK(PQresultStatus);
395: DLINK(PQexec);
1.4 parser 396: DLINK(PQftype);
397: DLINK(lo_open); DLINK(lo_close);
398: DLINK(lo_read); DLINK(lo_write);
399: DLINK(lo_lseek); DLINK(lo_creat);
400: DLINK(lo_tell); DLINK(lo_unlink);
401: DLINK(lo_import); DLINK(lo_export);
1.1 parser 402:
403: return 0;
404: }
405:
406: };
407:
408: extern "C" SQL_Driver *create() {
409: return new PgSQL_Driver();
410: }