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1.1 misha 1: /** @file
2: Parser SQLite driver.
3:
4: (c) Dmitry "Creator" Bobrik, 2004
5: */
1.4 misha 6: //static const char *RCSId="$Id: parser3sqlite.C,v 1.3 2007-12-27 14:24:21 misha 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:
17: #define MAX_STRING 0x400
18: #define MAX_NUMBER 20
19:
1.4 misha 20: #define SQLITE_DEFAULT_CHARSET "UTF-8"
21:
1.1 misha 22: #if _MSC_VER
23: # define snprintf _snprintf
24: # define strcasecmp _stricmp
25: #endif
26:
27: static char *lsplit(char *string, char delim) {
28: if(string) {
29: char *v=strchr(string, delim);
1.5 ! misha 30: if(v){
1.1 misha 31: *v=0;
32: return v+1;
33: }
34: }
35: return 0;
36: }
37:
38: static char *lsplit(char **string_ref, char delim) {
39: char *result=*string_ref;
40: char *next=lsplit(*string_ref, delim);
41: *string_ref=next;
42: return result;
43: }
44:
45: static void toupper_str(char *out, const char *in, size_t size) {
46: while(size--)
47: *out++=(char)toupper(*in++);
48: }
49:
50: struct Connection {
51: SQL_Driver_services* services;
52:
53: sqlite3* handle;
54: const char* cstrClientCharset;
55: bool autocommit;
56: };
57:
58:
59:
60: /**
61: SQLite server driver
62: */
63: class SQLite_Driver : public SQL_Driver {
64: public:
65:
66: SQLite_Driver() : SQL_Driver() {
67: }
68:
69: /// get api version
70: int api_version() { return SQL_DRIVER_API_VERSION; }
1.4 misha 71:
1.1 misha 72: /// initialize driver by loading sql dynamic link library
73: const char *initialize(char *dlopen_file_spec) {
74: return dlopen_file_spec?
75: dlink(dlopen_file_spec):"client library column is empty";
76: }
1.4 misha 77:
1.1 misha 78: /** connect
79: @param url
1.4 misha 80: format: @b [localhost/]dbfile?
81: ClientCharset=UTF-8&
82: autocommit=1
1.1 misha 83: */
84: void connect(
1.4 misha 85: char *url,
86: SQL_Driver_services& services,
87: void **connection_ref ///< output: Connection*
88: ){
1.1 misha 89:
90: int rc;
91:
1.4 misha 92: Connection& connection=*(Connection *)services.malloc(sizeof(Connection));
93: connection.services=&services;
94: connection.cstrClientCharset=SQLITE_DEFAULT_CHARSET;
95: connection.autocommit=true;
1.1 misha 96:
1.5 ! misha 97: char* db = url;
! 98: char* options = lsplit(db, '?');
! 99:
! 100: //char* document_root=(char*)services.request_document_root();
! 101: char* document_root=0;
! 102: char *db_path=(char*)services.malloc(strlen(document_root) + strlen(db) + 2);
! 103: if(document_root){
! 104: db_path=strncat(db_path, document_root, MAX_STRING);
! 105: db_path+='/';
! 106: }
1.4 misha 107: db_path=strncat(db_path, db, MAX_STRING);
108:
109: while(options) {
110: if(char *key=lsplit(&options, '&')) {
111: if(*key) {
112: if(char *value=lsplit(key, '=')) {
113: if(strcmp(key, "ClientCharset" )==0) { // transcoding with parser
114: toupper_str(value, value, strlen(value));
115: connection.cstrClientCharset=value;
116: continue;
117: } else if(strcasecmp(key, "autocommit")==0) {
118: if(atoi(value)==0)
119: connection.autocommit=false;
120: continue;
121: } else
122: services._throw("unknown connect option" /*key*/);
123: } else
124: services._throw("connect option without =value" /*key*/);
125: }
126: }
127: }
128:
129: // transcode database_name from $request:charset to UTF-8
130: size_t transcoded_db_path_size;
131: const char* sdb = db_path;
132: services.transcode(sdb, strlen(db_path),
133: sdb, transcoded_db_path_size,
134: services.request_charset(),
135: SQLITE_DEFAULT_CHARSET);
136:
1.5 ! misha 137: rc=sqlite3_open(db_path, &connection.handle);
1.1 misha 138:
1.5 ! misha 139: if(rc!=SQLITE_OK){
! 140: _throw(connection, sqlite3_errmsg(connection.handle));
1.1 misha 141: sqlite3_close(connection.handle);
142: }
143:
144: *connection_ref=&connection;
1.5 ! misha 145:
1.4 misha 146: if(!connection.autocommit)
147: exec(connection, "SET AUTOCOMMIT=0");
148:
1.1 misha 149: }
150:
151: void exec(Connection& connection, const char* statement) {
1.5 ! misha 152: char* zErr;
1.1 misha 153: int rc;
1.4 misha 154: rc=sqlite3_exec(connection.handle, statement, 0, 0, &zErr);
155: if(rc!=SQLITE_OK){
156: _throw(connection, zErr);
157: sqlite3_free(zErr); // error? can't free memory after throw
1.1 misha 158: }
159:
160: }
161:
162: void disconnect(void *aconnection) {
163: Connection& connection=*static_cast<Connection*>(aconnection);
164: sqlite3_close(connection.handle);
165: connection.handle=0;
1.4 misha 166: }
1.1 misha 167:
168: void commit(void *aconnection) {
169: Connection& connection=*static_cast<Connection*>(aconnection);
170: if(!connection.autocommit)
1.4 misha 171: exec(connection, "COMMIT");
1.1 misha 172: }
1.4 misha 173:
1.1 misha 174: void rollback(void *aconnection) {
175: Connection& connection=*static_cast<Connection*>(aconnection);
176: if(!connection.autocommit)
1.4 misha 177: exec(connection, "ROLLBACK");
1.1 misha 178: }
179:
180: bool ping(void *aconnection) {
1.4 misha 181: return true; // not needed
1.1 misha 182: }
183:
184: const char* quote(void *aconnection, const char *from, unsigned int length) {
185: Connection& connection=*static_cast<Connection*>(aconnection);
186: /*
187: You must allocate the to buffer to be at least length*2+1 bytes long.
1.4 misha 188: In the worse case, each character may need to be encoded as using two bytes,
189: and you need room for the terminating null byte.
1.1 misha 190: */
191: char *result=(char*)connection.services->malloc_atomic(length*2+1);
192: char *to=result;
193: while(length--) {
194: if(*from=='\'') { // ' -> ''
195: *to++='\'';
1.4 misha 196: } else if(*from=='\"') { // " -> ""
197: *to++='\"';
1.1 misha 198: }
199: *to++=*from++;
200: }
201: *to=0;
202: return result;
203: }
1.4 misha 204:
1.1 misha 205: void query(void *aconnection,
206: const char *astatement,
207: size_t placeholders_count, Placeholder* placeholders,
208: unsigned long offset, unsigned long limit,
209: SQL_Driver_query_event_handlers& handlers) {
210:
211: Connection& connection=*static_cast<Connection*>(aconnection);
212: SQL_Driver_services& services=*connection.services;
213: const char* cstrClientCharset=connection.cstrClientCharset;
214:
215: if(placeholders_count>0)
1.5 ! misha 216: services._throw("bind variables not supported yet");
1.4 misha 217:
218: // transcode from $request:charset to ClientCharset
219: if(cstrClientCharset) {
220: size_t transcoded_statement_size;
221: services.transcode(astatement, strlen(astatement),
222: astatement, transcoded_statement_size,
223: services.request_charset(),
224: cstrClientCharset);
225: }
226:
1.1 misha 227: const char *statement;
228: if(offset || limit) {
229: size_t statement_size=strlen(astatement);
230: char *statement_limited=(char *)services.malloc_atomic(
231: statement_size+MAX_NUMBER*2+8/* limit #,#*/+1);
232: char *cur=statement_limited;
233: memcpy(cur, astatement, statement_size); cur+=statement_size;
234: cur+=sprintf(cur, " limit ");
235: if(offset)
236: cur+=snprintf(cur, MAX_NUMBER+1, "%u,", offset);
237: if(limit)
238: cur+=snprintf(cur, MAX_NUMBER, "%u", limit);
239: statement=statement_limited;
240: } else
241: statement=astatement;
242:
243:
244: const char *pzTail;
245: sqlite3_stmt *SQL;
246: int rc;
247: int i;
248: SQL_Error sql_error;
1.5 ! misha 249: bool failed=false;
1.1 misha 250:
251: do{ // cycling through SQL commands
252:
253: rc = sqlite3_prepare(connection.handle, statement, -1, &SQL, &pzTail);
254:
1.4 misha 255: if(rc!=SQLITE_OK){
256: _throw(connection, sqlite3_errmsg(connection.handle));
1.5 ! misha 257: sqlite3_free((char*)pzTail); // error? can't free memory after throw
1.1 misha 258: }
259:
260:
261: #define CHECK(afailed) if(afailed) { failed=true; goto cleanup; }
262:
263: int column_count = sqlite3_column_count(SQL);
264:
265: if(!column_count){ // empty result: insert|delete|update|...
266: rc = sqlite3_step(SQL);
267: } else {
268:
269: for(i=0; i<column_count; i++){
270: const char *column_name = sqlite3_column_name(SQL, i);
271: size_t length = strlen(column_name);
272:
273: char* strm=(char*)services.malloc_atomic(length+1);
274: memcpy(strm, column_name, length+1);
1.4 misha 275: const char* str = strm;
276: // transcode to $request:charset from connect-string?ClientCharset
277: if(cstrClientCharset) {
278: services.transcode(str, length,
279: str, length,
280: cstrClientCharset,
281: services.request_charset());
282: }
283:
1.1 misha 284: CHECK(handlers.add_column(sql_error, (const char*)strm, length));
285: }
286: CHECK(handlers.before_rows(sql_error));
287:
288: int column_type;
1.5 ! misha 289: const char *str;
1.1 misha 290: size_t length = 0;
291:
292: do{
293: rc = sqlite3_step(SQL);
294: if( rc == SQLITE_ROW ){ // новая строка!!
295:
296: CHECK(handlers.add_row(sql_error));
297:
298: for(i=0; i<column_count; i++){
299:
300: column_type = sqlite3_column_type(SQL, i);
301:
302: // SQLite позволяет поле любого типа получить в виде строки через sqlite3_column_text
303: // просто перекодирует если требуется
304: // а парсер только строковые значения получает
305: // но switch я всё-таки сделал - так, на будущее
306: switch(column_type) {
307: case SQLITE_TEXT:
1.5 ! misha 308: str=(const char*)sqlite3_column_text(SQL, i);
! 309: length=strlen((const char*)str);
1.1 misha 310: break;
311: case SQLITE_INTEGER:
1.5 ! misha 312: str=(const char*)sqlite3_column_text(SQL, i);
! 313: length=strlen((const char*)str);
1.1 misha 314: break;
1.2 misha 315: case SQLITE_NULL:
1.4 misha 316: str=NULL;
317: length=0;
1.2 misha 318: break;
1.1 misha 319: default:
1.5 ! misha 320: str=(const char*)sqlite3_column_text(SQL, i);
! 321: length=strlen((const char*)str);
1.1 misha 322: break;
323: }
324:
1.4 misha 325: if(length){
326: char* strm=(char*)services.malloc_atomic(length+1);
327: memcpy(strm, str, length+1);
1.5 ! misha 328: str=strm;
1.4 misha 329:
330: // transcode to $request:charset from connect-string?ClientCharset
331: if(cstrClientCharset) {
332: services.transcode(str, length,
333: str, length,
334: cstrClientCharset,
335: services.request_charset());
336: }
337: } else
338: str = 0;
339:
340: CHECK(handlers.add_row_cell(sql_error, str, length));
1.1 misha 341:
342: }
343: }
1.5 ! misha 344: } while(rc == SQLITE_BUSY || rc == SQLITE_ROW);
1.1 misha 345:
346: } // if column
347:
1.5 ! misha 348: if(rc == SQLITE_ERROR || rc == SQLITE_MISUSE){
1.4 misha 349: _throw(connection, sqlite3_errmsg(connection.handle));
1.1 misha 350: }
351:
352: cleanup:
353: sqlite3_finalize(SQL);
354: statement = pzTail;
355: } while (strlen(pzTail) > 0);
356:
357: if(failed)
1.5 ! misha 358: services._throw(sql_error);
1.1 misha 359: }
360:
1.4 misha 361: private:
1.5 ! misha 362: void _throw(Connection& connection, const char* aerr_msg){
1.4 misha 363: size_t err_length=strlen(aerr_msg);
364: if(err_length && connection.cstrClientCharset) {
365: connection.services->transcode(aerr_msg, err_length,
366: aerr_msg, err_length,
367: connection.cstrClientCharset,
368: connection.services->request_charset());
369: }
370: connection.services->_throw(aerr_msg);
371: }
372:
1.1 misha 373: private: // sqlite client library funcs
374:
375: typedef int (*t_sqlite3_open)(const char *filename, sqlite3 **ppDb); t_sqlite3_open sqlite3_open;
376:
377: typedef int (*t_sqlite3_close)(sqlite3 *); t_sqlite3_close sqlite3_close;
378:
379: typedef int (*t_sqlite3_exec)(sqlite3*, const char *sql, sqlite3_callback, void *, char **errmsg); t_sqlite3_exec sqlite3_exec;
380:
381: typedef void (*t_sqlite3_free)(char *z); t_sqlite3_free sqlite3_free;
382:
383: typedef const char *(* t_sqlite3_errmsg)(sqlite3*); t_sqlite3_errmsg sqlite3_errmsg;
384:
385: typedef int (* t_sqlite3_prepare)(sqlite3 *db, const char *zSql, int nBytes, sqlite3_stmt **ppStmt, const char **pzTail); t_sqlite3_prepare sqlite3_prepare;
386:
387: typedef int (* t_sqlite3_column_count)(sqlite3_stmt *pStmt); t_sqlite3_column_count sqlite3_column_count;
388:
389: typedef int (* t_sqlite3_finalize)(sqlite3_stmt *pStmt); t_sqlite3_finalize sqlite3_finalize;
390:
391: typedef const char *(* t_sqlite3_column_name)(sqlite3_stmt*,int); t_sqlite3_column_name sqlite3_column_name;
392:
393: typedef int (* t_sqlite3_step)(sqlite3_stmt*); t_sqlite3_step sqlite3_step;
394:
395: typedef int (* t_sqlite3_column_type)(sqlite3_stmt*, int iCol); t_sqlite3_column_type sqlite3_column_type;
396:
397: typedef const unsigned char *(* t_sqlite3_column_text)(sqlite3_stmt*, int iCol); t_sqlite3_column_text sqlite3_column_text;
398:
1.5 ! misha 399:
1.1 misha 400: private: // sqlite client library funcs linking
401:
402: const char *dlink(const char *dlopen_file_spec) {
403: if(lt_dlinit())
404: return lt_dlerror();
405: lt_dlhandle handle=lt_dlopen(dlopen_file_spec);
406: if (!handle) {
407: if(const char* result=lt_dlerror())
408: return result;
409:
410: return "can not open the dynamic link module";
411: }
412:
413: #define DSLINK(name, action) \
414: name=(t_##name)lt_dlsym(handle, #name); \
415: if(!name) \
416: action;
417:
418: #define DLINK(name) DSLINK(name, return "function " #name " was not found")
419: #define SLINK(name) DSLINK(name, name=subst_##name)
420:
421: DLINK(sqlite3_open);
422: DLINK(sqlite3_close);
423: DLINK(sqlite3_exec);
424: DLINK(sqlite3_free);
425: DLINK(sqlite3_errmsg);
426: DLINK(sqlite3_prepare);
427: DLINK(sqlite3_column_count);
428: DLINK(sqlite3_finalize);
429: DLINK(sqlite3_column_name);
430: DLINK(sqlite3_step);
431: DLINK(sqlite3_column_type);
432: DLINK(sqlite3_column_text);
433: return 0;
434: }
435:
436: };
437:
438: extern "C" SQL_Driver *SQL_DRIVER_CREATE() {
439: return new SQLite_Driver();
440: }