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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: */
1.5 ! parser 10: static const char *RCSId="$Id: parser3pgsql.C,v 1.4 2001/07/31 12:44:36 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: 3.23.22b
128: You must allocate the to buffer to be at least length*2+1 bytes long.
129: (In the worse case, each character may need to be encoded as using two bytes,
130: and you need room for the terminating null byte.)
131:
132: it's already UNTAINT_TIMES_BIGGER
133: */
134: unsigned int result=length;
135: while(length--) {
1.3 parser 136: switch(*from) {
137: case '\'': // "'" -> "''"
1.1 parser 138: *to++='\'';
1.3 parser 139: break;
140: case '\\': // "\" -> "\\"
141: *to++='\'';
142: break;
143: }
1.1 parser 144: *to++=*from++;
145: }
146: return result;
147: }
148: void query(
149: SQL_Driver_services& services, void *connection,
150: const char *astatement, unsigned long offset, unsigned long limit,
151: SQL_Driver_query_event_handlers& handlers) {
152:
1.4 parser 153: PGconn *conn=(PGconn *)connection;
1.5 ! parser 154: #define PQclear_throwPQerror { \
! 155: PQclear(res); \
! 156: services._throw(PQerrorMessage(conn)); \
! 157: }
! 158: #define PQclear_throw(msg) { \
! 159: PQclear(res); \
! 160: services._throw(msg); \
! 161: }
! 162:
1.1 parser 163:
164: const char *statement;
165: if(offset || limit) {
166: size_t statement_size=strlen(astatement);
167: char *statement_limited=(char *)services.malloc(
168: statement_size+MAX_NUMBER*2+15/* limit # offset #*/+1);
169: char *cur=statement_limited;
170: memcpy(cur, astatement, statement_size); cur+=statement_size;
171: if(limit)
172: cur+=snprintf(cur, 7+MAX_NUMBER, " limit %u", limit);
173: if(offset)
174: cur+=snprintf(cur, 8+MAX_NUMBER, " offset %u", offset);
175: statement=statement_limited;
176: } else
177: statement=astatement;
178:
1.4 parser 179: PGresult *res=PQexec(conn, statement);
1.1 parser 180: if(!res)
1.4 parser 181: services._throw(PQerrorMessage(conn));
1.1 parser 182:
183: switch(PQresultStatus(res)) {
184: case PGRES_EMPTY_QUERY:
1.5 ! parser 185: PQclear_throw("no query");
1.1 parser 186: break;
187: case PGRES_COMMAND_OK:
188: // empty result: insert|delete|update|...
189: return;
190: case PGRES_TUPLES_OK:
191: break;
192: default:
1.5 ! parser 193: PQclear_throw("unknown PQexec error");
1.1 parser 194: break;
195: }
196:
197: int column_count=PQnfields(res);
1.5 ! parser 198: if(!column_count)
! 199: PQclear_throw("result contains no columns");
1.1 parser 200:
201: for(int i=0; i<column_count; i++){
202: char *name=PQfname(res, i);
203: size_t size=strlen(name);
204: void *ptr=services.malloc(size);
205: memcpy(ptr, name, size);
206: handlers.add_column(ptr, size);
207: }
208:
209: handlers.before_rows();
1.4 parser 210:
1.1 parser 211: if(unsigned long row_count=(unsigned long)PQntuples(res))
212: for(unsigned long r=0; r<row_count; r++) {
213: handlers.add_row();
214: for(int i=0; i<column_count; i++){
1.4 parser 215: const char *cell=PQgetvalue(res, r, i);
216: size_t size;
1.1 parser 217: void *ptr;
1.4 parser 218: if(PQftype(res, i)==OIDOID) {
219: // ObjectID column, read object bytes
220: // _asm int 3;
221:
222: char *error_pos=0;
223: Oid oid=cell?atoi(cell):0;
224: int fd=lo_open(conn, oid, INV_READ);
225: if(fd>=0) {
226: // seek to end
227: if(lo_lseek(conn, fd, 0, SEEK_END)<0)
1.5 ! parser 228: PQclear_throwPQerror;
1.4 parser 229: // get size
230: int size_tell=lo_tell(conn, fd);
231: if(size_tell<0)
1.5 ! parser 232: PQclear_throwPQerror;
1.4 parser 233: // seek to begin
234: if(lo_lseek(conn, fd, 0, SEEK_SET)<0)
1.5 ! parser 235: PQclear_throwPQerror;
1.4 parser 236: size=(size_t)size_tell;
237: if(size) {
238: // read
239: ptr=services.malloc(size);
240: char *buf=(char *)ptr;
241: int countdown=size_tell;
242: int size_read;
243: while(countdown && (size_read=lo_read(conn, fd, buf, min(LO_BUFSIZE, countdown)))>0) {
244: buf+=size_read;
245: countdown-=size_read;
246: }
1.5 ! parser 247: if(countdown)
! 248: PQclear_throw("lo_read can not read all bytes of object");
1.4 parser 249: } else
250: ptr=0;
251: if(lo_close(conn, fd)<0)
1.5 ! parser 252: PQclear_throwPQerror;
1.4 parser 253: } else
1.5 ! parser 254: PQclear_throwPQerror;
1.4 parser 255: } else {
256: // normal column, read it as ASCII string
257: size=(size_t)PQgetlength(res, r, i);
258: if(size) {
259: ptr=services.malloc(size);
260: memcpy(ptr, cell, size);
261: } else
262: ptr=0;
263: }
1.1 parser 264: handlers.add_row_cell(ptr, size);
265: }
266: }
267:
268: PQclear(res);
269: }
270:
1.4 parser 271: private: // private funcs
272:
273: void begin_transaction(SQL_Driver_services& services, PGconn *conn) {
274: if(PGresult *res=PQexec(conn, "BEGIN"))
275: PQclear(res);
276: else
277: services._throw(PQerrorMessage(conn));
278: }
279:
280: private: // conn client library funcs
1.1 parser 281:
282: typedef PGconn* (*t_PQsetdbLogin)(
283: const char *pghost,
284: const char *pgport,
285: const char *pgoptions,
286: const char *pgtty,
287: const char *dbName,
288: const char *login,
289: const char *pwd); t_PQsetdbLogin PQsetdbLogin;
290: typedef void (*t_PQfinish)(PGconn *conn); t_PQfinish PQfinish;
291: typedef char *(*t_PQerrorMessage)(const PGconn* conn); t_PQerrorMessage PQerrorMessage;
292: typedef ConnStatusType (*t_PQstatus)(const PGconn *conn); t_PQstatus PQstatus;
293: typedef PGresult *(*t_PQexec)(PGconn *conn,
294: const char *query); t_PQexec PQexec;
295: typedef ExecStatusType (*t_PQresultStatus)(const PGresult *res); t_PQresultStatus PQresultStatus;
296: typedef int (*t_PQgetlength)(const PGresult *res,
297: int tup_num,
298: int field_num); t_PQgetlength PQgetlength;
299: typedef char* (*t_PQgetvalue)(const PGresult *res,
300: int tup_num,
301: int field_num); t_PQgetvalue PQgetvalue;
302: typedef int (*t_PQntuples)(const PGresult *res); t_PQntuples PQntuples;
303: typedef char *(*t_PQfname)(const PGresult *res,
304: int field_index); t_PQfname PQfname;
305: typedef int (*t_PQnfields)(const PGresult *res); t_PQnfields PQnfields;
306: typedef void (*t_PQclear)(PGresult *res); t_PQclear PQclear;
307:
1.4 parser 308: typedef Oid (*t_PQftype)(const PGresult *res, int field_num); t_PQftype PQftype;
309:
310: typedef int (*t_lo_open)(PGconn *conn, Oid lobjId, int mode); t_lo_open lo_open;
311: typedef int (*t_lo_close)(PGconn *conn, int fd); t_lo_close lo_close;
312: typedef int (*t_lo_read)(PGconn *conn, int fd, char *buf, size_t len); t_lo_read lo_read;
313: typedef int (*t_lo_write)(PGconn *conn, int fd, char *buf, size_t len); t_lo_write lo_write;
314: typedef int (*t_lo_lseek)(PGconn *conn, int fd, int offset, int whence); t_lo_lseek lo_lseek;
315: typedef Oid (*t_lo_creat)(PGconn *conn, int mode); t_lo_creat lo_creat;
316: typedef int (*t_lo_tell)(PGconn *conn, int fd); t_lo_tell lo_tell;
317: typedef int (*t_lo_unlink)(PGconn *conn, Oid lobjId); t_lo_unlink lo_unlink;
318: typedef Oid (*t_lo_import)(PGconn *conn, const char *filename); t_lo_import lo_import;
319: typedef int (*t_lo_export)(PGconn *conn, Oid lobjId, const char *filename); t_lo_export lo_export;
1.1 parser 320:
1.4 parser 321: private: // conn client library funcs linking
1.1 parser 322:
323: const char *dlink(const char *dlopen_file_spec) {
324: lt_dlhandle handle=lt_dlopen(dlopen_file_spec);
325: if(!handle)
326: return "can not open the dynamic link module";
327:
328: #define DSLINK(name, action) \
329: name=(t_##name)lt_dlsym(handle, #name); \
330: if(!name) \
331: action;
332:
333: #define DLINK(name) DSLINK(name, return "function " #name " was not found")
334:
335: DLINK(PQsetdbLogin);
336: DLINK(PQerrorMessage);
337: DLINK(PQstatus);
338: DLINK(PQfinish);
339: DLINK(PQgetvalue);
340: DLINK(PQgetlength);
341: DLINK(PQntuples);
342: DLINK(PQfname);
343: DLINK(PQnfields);
344: DLINK(PQclear);
345: DLINK(PQresultStatus);
346: DLINK(PQexec);
1.4 parser 347: DLINK(PQftype);
348: DLINK(lo_open); DLINK(lo_close);
349: DLINK(lo_read); DLINK(lo_write);
350: DLINK(lo_lseek); DLINK(lo_creat);
351: DLINK(lo_tell); DLINK(lo_unlink);
352: DLINK(lo_import); DLINK(lo_export);
1.1 parser 353:
354: return 0;
355: }
356:
357: };
358:
359: extern "C" SQL_Driver *create() {
360: return new PgSQL_Driver();
361: }