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1.1 misha 1: /** @file
2: Parser SQLite driver.
3:
4: (c) Dmitry "Creator" Bobrik, 2004
5: */
1.13 ! moko 6: //static const char *RCSId="$Id: parser3sqlite.C,v 1.12 2012-04-19 21:33:08 moko Exp $";
1.1 misha 7:
8: #include "config_includes.h"
9:
10: #include "pa_sql_driver.h"
11: //#include "windows.h" // for messagebox
12:
13: #define NO_CLIENT_LONG_LONG
14: #include "sqlite3.h"
15: #include "ltdl.h"
16:
1.9 misha 17: #define MAX_COLS 500
1.1 misha 18: #define MAX_STRING 0x400
19: #define MAX_NUMBER 20
20:
1.4 misha 21: #define SQLITE_DEFAULT_CHARSET "UTF-8"
22:
1.1 misha 23: #if _MSC_VER
24: # define snprintf _snprintf
25: # define strcasecmp _stricmp
26: #endif
27:
28: static char *lsplit(char *string, char delim) {
1.6 misha 29: if(string) {
1.1 misha 30: char *v=strchr(string, delim);
1.6 misha 31: if(v) {
1.1 misha 32: *v=0;
33: return v+1;
34: }
1.6 misha 35: }
36: return 0;
1.1 misha 37: }
38:
39: static char *lsplit(char **string_ref, char delim) {
1.6 misha 40: char *result=*string_ref;
1.1 misha 41: char *next=lsplit(*string_ref, delim);
1.6 misha 42: *string_ref=next;
43: return result;
1.1 misha 44: }
45:
46: static void toupper_str(char *out, const char *in, size_t size) {
47: while(size--)
48: *out++=(char)toupper(*in++);
49: }
50:
51: struct Connection {
52: SQL_Driver_services* services;
53:
54: sqlite3* handle;
1.6 misha 55: const char* client_charset;
56: bool multi_statements;
1.1 misha 57: bool autocommit;
1.12 moko 58: int busy_timeout;
1.1 misha 59: };
60:
61:
62:
63: /**
64: SQLite server driver
65: */
66: class SQLite_Driver : public SQL_Driver {
67: public:
68:
69: SQLite_Driver() : SQL_Driver() {
70: }
71:
72: /// get api version
73: int api_version() { return SQL_DRIVER_API_VERSION; }
1.4 misha 74:
1.1 misha 75: /// initialize driver by loading sql dynamic link library
76: const char *initialize(char *dlopen_file_spec) {
77: return dlopen_file_spec?
78: dlink(dlopen_file_spec):"client library column is empty";
79: }
1.4 misha 80:
1.1 misha 81: /** connect
82: @param url
1.8 misha 83: format: @b db-file|:memory:|temporary:?
84: autocommit=1& // =0 disable autocommit. in this case 1 connect == 1 transaction.
85: // or you can use begin/commit|rollback explicitly
86: multi_statements=0& // =1 allow many statements in 1 query
87: ClientCharset=UTF-8 // will transcode to/from specified charset instead of UTF-8 (default for sqlite)
1.1 misha 88: */
89: void connect(
1.6 misha 90: char *url,
91: SQL_Driver_services& services,
92: void **connection_ref ///< output: Connection*
1.4 misha 93: ){
1.1 misha 94:
1.4 misha 95: Connection& connection=*(Connection *)services.malloc(sizeof(Connection));
1.6 misha 96: *connection_ref=&connection;
1.4 misha 97: connection.services=&services;
1.6 misha 98:
1.12 moko 99: connection.client_charset=SQLITE_DEFAULT_CHARSET;
1.6 misha 100: connection.multi_statements=false;
1.4 misha 101: connection.autocommit=true;
1.12 moko 102: connection.busy_timeout=4000;
1.1 misha 103:
1.6 misha 104: char* db_path=0;
105: char* db=url;
106: char* options=lsplit(db, '?');
107:
1.8 misha 108: if(strcmp(db, ":memory:")==0){ // in-memory temporary DB
1.6 misha 109: db_path=db;
1.8 misha 110: } else if(strcmp(db, ":temporary:")==0){ // on-disk temporary DB
1.6 misha 111: // do nothing: empty path mean temporary table on disk
1.8 misha 112: } else {
113: char* document_root=(char*)services.request_document_root();
114: if(!document_root) // path to DB-file which was specified by user is path from document_root as anywhere in parser
115: services._throw("document_root is empty");
116:
117: db_path=(char*)services.malloc_atomic(strlen(document_root)+1+strlen(db)+1);
1.9 misha 118: strcpy(db_path, document_root);
119: strcat(db_path, "/");
120: strcat(db_path, db);
1.5 misha 121: }
1.4 misha 122:
1.6 misha 123: //services._throw(db_path);
124:
125: while(options){
126: if(char* key=lsplit(&options, '&')){
1.4 misha 127: if(*key) {
1.6 misha 128: if(char* value=lsplit(key, '=')){
1.8 misha 129: if(strcasecmp(key, "multi_statements")==0){
1.6 misha 130: if(atoi(value)!=0)
131: connection.multi_statements=true;
1.12 moko 132: } else if(strcasecmp(key, "busy_timeout")==0){
133: connection.busy_timeout=atoi(value);
1.6 misha 134: } else if(strcasecmp(key, "autocommit")==0){
1.4 misha 135: if(atoi(value)==0)
136: connection.autocommit=false;
1.8 misha 137: } else if(strcmp(key, "ClientCharset")==0){
1.6 misha 138: toupper_str(value, value, strlen(value));
139: connection.client_charset=value;
1.4 misha 140: } else
141: services._throw("unknown connect option" /*key*/);
142: } else
143: services._throw("connect option without =value" /*key*/);
144: }
145: }
146: }
147:
148: // transcode database_name from $request:charset to UTF-8
1.6 misha 149: if(db_path && _transcode_required(connection, SQLITE_DEFAULT_CHARSET)){
150: size_t length=strlen(db_path);
151: services.transcode((const char*)db_path, length,
152: (const char*&)db_path, length,
153: services.request_charset(),
154: SQLITE_DEFAULT_CHARSET);
155:
156: }
1.4 misha 157:
1.1 misha 158:
1.6 misha 159: int rc=sqlite3_open(db_path, &connection.handle);
1.5 misha 160: if(rc!=SQLITE_OK){
1.6 misha 161: const char* error_msg=sqlite3_errmsg(connection.handle);
1.1 misha 162: sqlite3_close(connection.handle);
1.6 misha 163: _throw(connection, error_msg);
1.1 misha 164: }
1.6 misha 165:
1.12 moko 166: sqlite3_busy_timeout(connection.handle, connection.busy_timeout);
167:
1.6 misha 168: _begin_transaction(connection);
1.1 misha 169: }
170:
1.6 misha 171: void disconnect(void *aconnection){
1.1 misha 172: Connection& connection=*static_cast<Connection*>(aconnection);
173: sqlite3_close(connection.handle);
174: connection.handle=0;
1.4 misha 175: }
1.1 misha 176:
1.6 misha 177: void commit(void *aconnection){
1.1 misha 178: Connection& connection=*static_cast<Connection*>(aconnection);
179: if(!connection.autocommit)
1.6 misha 180: _execute_cmd(connection, "COMMIT");
181:
182: _begin_transaction(connection);
1.1 misha 183: }
1.4 misha 184:
1.6 misha 185: void rollback(void *aconnection){
1.1 misha 186: Connection& connection=*static_cast<Connection*>(aconnection);
187: if(!connection.autocommit)
1.6 misha 188: _execute_cmd(connection, "ROLLBACK");
189:
190: _begin_transaction(connection);
1.1 misha 191: }
192:
1.6 misha 193: bool ping(void *aconnection){
194: return true; // not needed
1.1 misha 195: }
196:
1.11 moko 197: // charset here is services.request_charset(), not connection.client_charset
198: // thus we can't use the sql server quoting support
199: const char* quote(void *aconnection, const char *str, unsigned int length)
200: {
201: const char* from;
202: const char* from_end=str+length;
203:
204: size_t quoted=0;
205:
206: for(from=str; from<from_end; from++){
207: if(*from=='\'')
208: quoted++;
209: }
210:
211: if(!quoted)
212: return str;
213:
1.1 misha 214: Connection& connection=*static_cast<Connection*>(aconnection);
1.11 moko 215: char *result=(char*)connection.services->malloc_atomic(length + quoted + 1);
216: char *to = result;
217:
218: for(from=str; from<from_end; from++){
219: if(*from=='\'')
220: *to++= '\''; // ' -> ''
221: *to++=*from;
1.1 misha 222: }
1.11 moko 223:
1.1 misha 224: *to=0;
225: return result;
226: }
1.4 misha 227:
1.1 misha 228: void query(void *aconnection,
1.6 misha 229: const char *astatement,
230: size_t placeholders_count, Placeholder* placeholders,
231: unsigned long offset, unsigned long limit,
232: SQL_Driver_query_event_handlers& handlers
233: ){
1.1 misha 234:
235: Connection& connection=*static_cast<Connection*>(aconnection);
236: SQL_Driver_services& services=*connection.services;
237:
238: if(placeholders_count>0)
1.5 misha 239: services._throw("bind variables not supported yet");
1.9 misha 240:
241: const char* request_charset=services.request_charset();
242: const char* client_charset=connection.client_charset;
1.6 misha 243: bool transcode_needed=_transcode_required(connection);
244:
245: // transcode query from $request:charset to ?ClientCharset
246: if(transcode_needed){
247: size_t length=strlen(astatement);
248: services.transcode(astatement, length,
249: astatement, length,
1.9 misha 250: request_charset,
251: client_charset);
1.4 misha 252: }
253:
1.1 misha 254: const char *statement;
1.6 misha 255: if(offset || limit!=SQL_NO_LIMIT){
1.1 misha 256: size_t statement_size=strlen(astatement);
257: char *statement_limited=(char *)services.malloc_atomic(
1.6 misha 258: statement_size+MAX_NUMBER*2+8/* LIMIT #,#*/+1);
1.1 misha 259: char *cur=statement_limited;
1.6 misha 260: memcpy(cur, astatement, statement_size);
261: cur+=statement_size;
262: cur+=sprintf(cur, " LIMIT ");
1.1 misha 263: if(offset)
1.12 moko 264: cur+=snprintf(cur, MAX_NUMBER+1, "%lu,", offset);
1.6 misha 265: if(limit!=SQL_NO_LIMIT)
1.12 moko 266: cur+=snprintf(cur, MAX_NUMBER, "%lu", limit);
1.1 misha 267: statement=statement_limited;
268: } else
269: statement=astatement;
270:
271:
272: const char *pzTail;
1.6 misha 273: int next_statement_length=0;
1.1 misha 274: sqlite3_stmt *SQL;
275: int rc;
276: SQL_Error sql_error;
1.5 misha 277: bool failed=false;
1.1 misha 278:
279: do{ // cycling through SQL commands
1.6 misha 280: rc=sqlite3_prepare(connection.handle, statement, -1, &SQL, &pzTail);
281: next_statement_length=strlen(pzTail);
1.4 misha 282: if(rc!=SQLITE_OK){
1.8 misha 283: //sqlite3_free((char*)pzTail);
1.4 misha 284: _throw(connection, sqlite3_errmsg(connection.handle));
1.6 misha 285: }
286: if(!connection.multi_statements && next_statement_length>0){ // multi statements was not allowed but pzTail point to not empty one
1.8 misha 287: //sqlite3_free((char*)pzTail);
288: _throw(connection, "multi statements are not allowed until opption ?multi_statements=1 in connect string is specified.");
1.1 misha 289: }
290:
1.6 misha 291: #define CHECK(afailed) if(afailed){ failed=true; goto cleanup; }
1.1 misha 292:
1.6 misha 293: int column_count=sqlite3_column_count(SQL);
1.1 misha 294:
1.6 misha 295: if(!column_count){ // empty result: insert|delete|update|...
296: rc=sqlite3_step(SQL);
1.1 misha 297: } else {
1.9 misha 298: if(column_count>MAX_COLS)
299: column_count=MAX_COLS;
300:
301: int column_types[MAX_COLS];
302: bool transcode_column[MAX_COLS];
303:
1.6 misha 304: for(int i=0; i<column_count; i++){
305: const char *column_name=sqlite3_column_name(SQL, i);
306: size_t length=strlen(column_name);
1.1 misha 307:
308: char* strm=(char*)services.malloc_atomic(length+1);
309: memcpy(strm, column_name, length+1);
1.6 misha 310: const char* str=strm;
311: // transcode column name from ?ClientCharset to $request:charset
312: if(transcode_needed){
1.4 misha 313: services.transcode(str, length,
314: str, length,
1.9 misha 315: client_charset,
316: request_charset);
1.4 misha 317: }
318:
1.6 misha 319: CHECK(handlers.add_column(sql_error, (const char*)str, length));
1.1 misha 320: }
321: CHECK(handlers.before_rows(sql_error));
322:
1.5 misha 323: const char *str;
1.6 misha 324: size_t length=0;
1.9 misha 325: bool first_row=true;
1.1 misha 326:
327: do{
1.6 misha 328: rc=sqlite3_step(SQL);
329: if(rc==SQLITE_ROW){ // new line!!
1.1 misha 330:
331: CHECK(handlers.add_row(sql_error));
332:
1.6 misha 333: for(int i=0; i<column_count; i++){
1.9 misha 334: if(first_row){
335: column_types[i]=sqlite3_column_type(SQL, i);
336: switch(column_types[i]){
337: case SQLITE_INTEGER:
338: case SQLITE_FLOAT:
339: case SQLITE_NULL:
340: transcode_column[i]=false;
341: break;
342: default:
343: transcode_column[i]=transcode_needed;
344: break;
345: }
346: }
347:
1.6 misha 348: // SQLite allow to get value of any type using sqlite3_column_text function
1.9 misha 349: switch(column_types[i]){
1.2 misha 350: case SQLITE_NULL:
1.6 misha 351: length=0;
1.4 misha 352: str=NULL;
1.2 misha 353: break;
1.6 misha 354: case SQLITE_BLOB:
355: str=(const char*)sqlite3_column_blob(SQL, i);
356: length=(size_t)sqlite3_column_bytes(SQL, i);
357: break;
1.9 misha 358: default: // anything else?
1.5 misha 359: str=(const char*)sqlite3_column_text(SQL, i);
1.6 misha 360: length=(size_t)sqlite3_column_bytes(SQL, i);
1.1 misha 361: break;
362: }
363:
1.4 misha 364: if(length){
365: char* strm=(char*)services.malloc_atomic(length+1);
366: memcpy(strm, str, length+1);
1.5 misha 367: str=strm;
1.4 misha 368:
1.9 misha 369: if(transcode_column[i]){
370: // transcode cell value from ?ClientCharset to $request:charset
1.4 misha 371: services.transcode(str, length,
372: str, length,
1.9 misha 373: client_charset,
374: request_charset);
1.4 misha 375: }
376: } else
1.6 misha 377: str=0;
1.4 misha 378:
379: CHECK(handlers.add_row_cell(sql_error, str, length));
1.1 misha 380:
381: }
1.9 misha 382: first_row=false;
1.1 misha 383: }
1.6 misha 384: } while(rc==SQLITE_BUSY || rc==SQLITE_ROW);
1.1 misha 385:
1.6 misha 386: }
1.1 misha 387:
1.6 misha 388: if(rc==SQLITE_ERROR || rc==SQLITE_MISUSE){
1.4 misha 389: _throw(connection, sqlite3_errmsg(connection.handle));
1.1 misha 390: }
391:
392: cleanup:
393: sqlite3_finalize(SQL);
1.6 misha 394: statement=pzTail;
395: } while (next_statement_length>0);
1.1 misha 396:
397: if(failed)
1.5 misha 398: services._throw(sql_error);
1.1 misha 399: }
400:
1.4 misha 401: private:
1.6 misha 402: void _begin_transaction(Connection& connection) {
403: if(!connection.autocommit){
404: _execute_cmd(connection, "BEGIN");
405: }
406: }
407:
408: void _execute_cmd(Connection& connection, const char* statement){
409: char* zErr;
410: int rc=sqlite3_exec(connection.handle, statement, 0, 0, &zErr);
411: if(rc!=SQLITE_OK){
412: size_t length=strlen(zErr);
413: char* err_msg=(char *)connection.services->malloc_atomic(length+1);
414: memcpy(err_msg, zErr, length);
415:
416: sqlite3_free(zErr);
417: _throw(connection, err_msg);
418: }
419:
420: }
421:
422: void _throw(Connection& connection, const char* aerr_msg){
423: size_t length=strlen(aerr_msg);
424: if(length && _transcode_required(connection)){
425: // transcode server error message from ?ClientCharset to $request:charset
426: connection.services->transcode(aerr_msg, length,
427: aerr_msg, length,
428: connection.client_charset,
429: connection.services->request_charset());
430: }
431: connection.services->_throw(aerr_msg);
432: }
433:
434: bool _transcode_required(Connection& connection, const char* charset=0){
435: return (strcmp(charset?charset:connection.client_charset, connection.services->request_charset())!=0);
436: }
437:
1.4 misha 438:
1.1 misha 439: private: // sqlite client library funcs
440:
441: typedef int (*t_sqlite3_open)(const char *filename, sqlite3 **ppDb); t_sqlite3_open sqlite3_open;
442:
443: typedef int (*t_sqlite3_close)(sqlite3 *); t_sqlite3_close sqlite3_close;
444:
1.12 moko 445: typedef int (*t_sqlite3_busy_timeout)(sqlite3*, int ms); t_sqlite3_busy_timeout sqlite3_busy_timeout;
446:
1.1 misha 447: typedef int (*t_sqlite3_exec)(sqlite3*, const char *sql, sqlite3_callback, void *, char **errmsg); t_sqlite3_exec sqlite3_exec;
448:
449: typedef void (*t_sqlite3_free)(char *z); t_sqlite3_free sqlite3_free;
450:
451: typedef const char *(* t_sqlite3_errmsg)(sqlite3*); t_sqlite3_errmsg sqlite3_errmsg;
452:
453: typedef int (* t_sqlite3_prepare)(sqlite3 *db, const char *zSql, int nBytes, sqlite3_stmt **ppStmt, const char **pzTail); t_sqlite3_prepare sqlite3_prepare;
454:
455: typedef int (* t_sqlite3_column_count)(sqlite3_stmt *pStmt); t_sqlite3_column_count sqlite3_column_count;
456:
457: typedef int (* t_sqlite3_finalize)(sqlite3_stmt *pStmt); t_sqlite3_finalize sqlite3_finalize;
458:
459: typedef const char *(* t_sqlite3_column_name)(sqlite3_stmt*,int); t_sqlite3_column_name sqlite3_column_name;
460:
461: typedef int (* t_sqlite3_step)(sqlite3_stmt*); t_sqlite3_step sqlite3_step;
462:
463: typedef int (* t_sqlite3_column_type)(sqlite3_stmt*, int iCol); t_sqlite3_column_type sqlite3_column_type;
464:
465: typedef const unsigned char *(* t_sqlite3_column_text)(sqlite3_stmt*, int iCol); t_sqlite3_column_text sqlite3_column_text;
466:
1.6 misha 467: typedef const unsigned char *(* t_sqlite3_column_blob)(sqlite3_stmt*, int iCol); t_sqlite3_column_blob sqlite3_column_blob;
468:
469: typedef int (* t_sqlite3_column_bytes)(sqlite3_stmt*, int iCol); t_sqlite3_column_bytes sqlite3_column_bytes;
470:
1.5 misha 471:
1.1 misha 472: private: // sqlite client library funcs linking
473:
474: const char *dlink(const char *dlopen_file_spec) {
1.13 ! moko 475: if(lt_dlinit()){
! 476: if(const char* result=lt_dlerror())
! 477: return result;
! 478: return "can not prepare to dynamic loading";
! 479: }
! 480:
! 481: lt_dlhandle handle=lt_dlopen(dlopen_file_spec);
1.1 misha 482:
1.13 ! moko 483: if(!handle){
! 484: if(const char* result=lt_dlerror())
! 485: return result;
1.1 misha 486: return "can not open the dynamic link module";
487: }
488:
489: #define DSLINK(name, action) \
490: name=(t_##name)lt_dlsym(handle, #name); \
491: if(!name) \
492: action;
493:
494: #define DLINK(name) DSLINK(name, return "function " #name " was not found")
495: #define SLINK(name) DSLINK(name, name=subst_##name)
496:
497: DLINK(sqlite3_open);
498: DLINK(sqlite3_close);
1.12 moko 499: DLINK(sqlite3_busy_timeout);
1.1 misha 500: DLINK(sqlite3_exec);
501: DLINK(sqlite3_free);
502: DLINK(sqlite3_errmsg);
503: DLINK(sqlite3_prepare);
504: DLINK(sqlite3_column_count);
505: DLINK(sqlite3_finalize);
506: DLINK(sqlite3_column_name);
507: DLINK(sqlite3_step);
508: DLINK(sqlite3_column_type);
509: DLINK(sqlite3_column_text);
1.6 misha 510: DLINK(sqlite3_column_blob);
511: DLINK(sqlite3_column_bytes);
1.1 misha 512: return 0;
513: }
514:
515: };
516:
517: extern "C" SQL_Driver *SQL_DRIVER_CREATE() {
518: return new SQLite_Driver();
519: }