Fri, 05 Dec 2008 07:41:15 +0000
Add DB2 driver module.
14 | 1 | #include "dbd_db2.h" |
2 | ||
3 | #define MAX_COLUMNS 255 | |
4 | ||
5 | #ifndef max | |
6 | #define max(a,b) (a > b ? a : b) | |
7 | #endif | |
8 | ||
9 | static const char *strlower(char *in) { | |
10 | char *s = in; | |
11 | ||
12 | while(*s) { | |
13 | *s= (*s <= 'Z' && *s >= 'A') ? (*s - 'A') + 'a' : *s; | |
14 | s++; | |
15 | } | |
16 | ||
17 | return in; | |
18 | } | |
19 | ||
20 | static lua_push_type_t db2_to_lua_push(unsigned int db2_type, int len) { | |
21 | lua_push_type_t lua_type; | |
22 | ||
23 | if (len == SQL_NULL_DATA) | |
24 | return LUA_PUSH_NIL; | |
25 | ||
26 | switch(db2_type) { | |
27 | case SQL_SMALLINT: | |
28 | case SQL_INTEGER: | |
29 | lua_type = LUA_PUSH_INTEGER; | |
30 | break; | |
31 | case SQL_DECIMAL: | |
32 | lua_type = LUA_PUSH_NUMBER; | |
33 | break; | |
34 | default: | |
35 | lua_type = LUA_PUSH_STRING; | |
36 | } | |
37 | ||
38 | return lua_type; | |
39 | } | |
40 | ||
41 | /* | |
42 | * success = statement:close() | |
43 | */ | |
44 | static int statement_close(lua_State *L) { | |
45 | statement_t *statement = (statement_t *)luaL_checkudata(L, 1, DBD_DB2_STATEMENT); | |
46 | SQLRETURN rc = SQL_SUCCESS; | |
47 | ||
48 | if (statement->stmt) { | |
49 | rc = SQLFreeHandle(SQL_HANDLE_STMT, statement->stmt); | |
50 | ||
51 | if (statement->resultset) | |
52 | free(statement->resultset); | |
53 | ||
54 | if (statement->bind) { | |
55 | int i; | |
56 | ||
57 | for (i = 0; i < statement->num_result_columns; i++) { | |
58 | free(statement->bind[i].buffer); | |
59 | } | |
60 | ||
61 | free(statement->bind); | |
62 | } | |
63 | ||
64 | statement->num_result_columns = 0; | |
65 | } | |
66 | ||
67 | return 0; | |
68 | } | |
69 | ||
70 | /* | |
71 | * success = statement:execute(...) | |
72 | */ | |
73 | static int statement_execute(lua_State *L) { | |
74 | int n = lua_gettop(L); | |
75 | statement_t *statement = (statement_t *)luaL_checkudata(L, 1, DBD_DB2_STATEMENT); | |
76 | int p; | |
77 | int i; | |
78 | int errflag = 0; | |
79 | const char *errstr = NULL; | |
80 | SQLRETURN rc = SQL_SUCCESS; | |
81 | unsigned char *buffer = NULL; | |
82 | int offset = 0; | |
83 | resultset_t *resultset = NULL; | |
84 | bindparams_t *bind; /* variable to read the results */ | |
85 | ||
86 | SQLCHAR message[SQL_MAX_MESSAGE_LENGTH + 1]; | |
87 | SQLCHAR sqlstate[SQL_SQLSTATE_SIZE + 1]; | |
88 | SQLINTEGER sqlcode; | |
89 | SQLSMALLINT length; | |
90 | ||
91 | if (!statement->stmt) { | |
92 | lua_pushboolean(L, 0); | |
93 | lua_pushstring(L, DBI_ERR_EXECUTE_INVALID); | |
94 | return 2; | |
95 | } | |
96 | ||
97 | for (p = 2; p <= n; p++) { | |
98 | int i = p - 1; | |
99 | int type = lua_type(L, p); | |
100 | char err[64]; | |
101 | const char *str = NULL; | |
102 | size_t len = 0; | |
103 | double *num; | |
104 | int *boolean; | |
105 | const static SQLLEN nullvalue = SQL_NULL_DATA; | |
106 | ||
107 | switch(type) { | |
108 | case LUA_TNIL: | |
109 | rc = SQLBindParameter(statement->stmt, i, SQL_PARAM_INPUT, SQL_C_LONG, SQL_INTEGER, 0, 0, (SQLPOINTER)0, 0, (SQLPOINTER)&nullvalue); | |
110 | errflag = rc != SQL_SUCCESS && rc != SQL_SUCCESS_WITH_INFO; | |
111 | break; | |
112 | case LUA_TNUMBER: | |
113 | buffer = realloc(buffer, offset + sizeof(double)); | |
114 | num = (double *)buffer + offset; | |
115 | *num = lua_tonumber(L, p); | |
116 | offset += sizeof(double); | |
117 | rc = SQLBindParameter(statement->stmt, i, SQL_PARAM_INPUT, SQL_C_DOUBLE, SQL_DECIMAL, 10, 0, (SQLPOINTER)num, 0, NULL); | |
118 | errflag = rc != SQL_SUCCESS && rc != SQL_SUCCESS_WITH_INFO; | |
119 | break; | |
120 | case LUA_TSTRING: | |
121 | str = lua_tolstring(L, p, &len); | |
122 | rc = SQLBindParameter(statement->stmt, i, SQL_PARAM_INPUT, SQL_C_CHAR, SQL_VARCHAR, 0, 0, (SQLPOINTER)str, len, NULL); | |
123 | errflag = rc != SQL_SUCCESS && rc != SQL_SUCCESS_WITH_INFO; | |
124 | break; | |
125 | case LUA_TBOOLEAN: | |
126 | buffer = realloc(buffer, offset + sizeof(int)); | |
127 | boolean = (int *)buffer + offset; | |
128 | *boolean = lua_toboolean(L, p); | |
129 | offset += sizeof(int); | |
130 | rc = SQLBindParameter(statement->stmt, i, SQL_PARAM_INPUT, SQL_C_LONG, SQL_INTEGER, 0, 0, (SQLPOINTER)boolean, len, NULL); | |
131 | errflag = rc != SQL_SUCCESS && rc != SQL_SUCCESS_WITH_INFO; | |
132 | break; | |
133 | default: | |
134 | /* | |
135 | * Unknown/unsupported value type | |
136 | */ | |
137 | errflag = 1; | |
138 | snprintf(err, sizeof(err)-1, DBI_ERR_BINDING_TYPE_ERR, lua_typename(L, type)); | |
139 | errstr = err; | |
140 | } | |
141 | ||
142 | if (errflag) | |
143 | break; | |
144 | } | |
145 | ||
146 | if (errflag) { | |
147 | realloc(buffer, 0); | |
148 | lua_pushboolean(L, 0); | |
149 | ||
150 | if (errstr) { | |
151 | lua_pushfstring(L, DBI_ERR_BINDING_PARAMS, errstr); | |
152 | } else { | |
153 | SQLGetDiagRec(SQL_HANDLE_STMT, statement->stmt, 1, sqlstate, &sqlcode, message, SQL_MAX_MESSAGE_LENGTH + 1, &length); | |
154 | ||
155 | lua_pushfstring(L, DBI_ERR_BINDING_PARAMS, message); | |
156 | } | |
157 | ||
158 | return 2; | |
159 | } | |
160 | ||
161 | rc = SQLExecute(statement->stmt); | |
162 | if (rc != SQL_SUCCESS) { | |
163 | SQLGetDiagRec(SQL_HANDLE_STMT, statement->stmt, 1, sqlstate, &sqlcode, message, SQL_MAX_MESSAGE_LENGTH + 1, &length); | |
164 | ||
165 | lua_pushnil(L); | |
166 | lua_pushfstring(L, DBI_ERR_PREP_STATEMENT, message); | |
167 | return 2; | |
168 | } | |
169 | ||
170 | /* | |
171 | * identify the number of output columns | |
172 | */ | |
173 | rc = SQLNumResultCols(statement->stmt, &statement->num_result_columns); | |
174 | ||
175 | if (statement->num_result_columns > 0) { | |
176 | resultset = (resultset_t *)malloc(sizeof(resultset_t) * statement->num_result_columns); | |
177 | memset(resultset, 0, sizeof(resultset_t) * statement->num_result_columns); | |
178 | ||
179 | bind = (bindparams_t *)malloc(sizeof(bindparams_t) * statement->num_result_columns); | |
180 | memset(bind, 0, sizeof(bindparams_t) * statement->num_result_columns); | |
181 | ||
182 | for (i = 0; i < statement->num_result_columns; i++) { | |
183 | /* | |
184 | * return a set of attributes for a column | |
185 | */ | |
186 | rc = SQLDescribeCol(statement->stmt, | |
187 | (SQLSMALLINT)(i + 1), | |
188 | resultset[i].name, | |
189 | sizeof(resultset[i].name), | |
190 | &resultset[i].name_len, | |
191 | &resultset[i].type, | |
192 | &resultset[i].size, | |
193 | &resultset[i].scale, | |
194 | NULL); | |
195 | ||
196 | if (rc != SQL_SUCCESS) { | |
197 | SQLGetDiagRec(SQL_HANDLE_STMT, statement->stmt, 1, sqlstate, &sqlcode, message, SQL_MAX_MESSAGE_LENGTH + 1, &length); | |
198 | ||
199 | lua_pushnil(L); | |
200 | lua_pushfstring(L, DBI_ERR_DESC_RESULT, message); | |
201 | return 2; | |
202 | } | |
203 | ||
204 | bind[i].buffer_len = resultset[i].size+1; | |
205 | ||
206 | /* | |
207 | *allocate memory to bind a column | |
208 | */ | |
209 | bind[i].buffer = (SQLCHAR *)malloc((int)bind[i].buffer_len); | |
210 | ||
211 | rc = SQLBindCol(statement->stmt, | |
212 | (SQLSMALLINT)(i + 1), | |
213 | SQL_C_CHAR, | |
214 | bind[i].buffer, | |
215 | bind[i].buffer_len, | |
216 | &bind[i].len); | |
217 | ||
218 | if (rc != SQL_SUCCESS) { | |
219 | SQLGetDiagRec(SQL_HANDLE_STMT, statement->stmt, 1, sqlstate, &sqlcode, message, SQL_MAX_MESSAGE_LENGTH + 1, &length); | |
220 | ||
221 | lua_pushnil(L); | |
222 | lua_pushfstring(L, DBI_ERR_ALLOC_RESULT, message); | |
223 | return 2; | |
224 | } | |
225 | } | |
226 | ||
227 | statement->resultset = resultset; | |
228 | statement->bind = bind; | |
229 | } | |
230 | ||
231 | /* | |
232 | * free the buffer with a resize to 0 | |
233 | */ | |
234 | realloc(buffer, 0); | |
235 | ||
236 | lua_pushboolean(L, 1); | |
237 | return 1; | |
238 | } | |
239 | ||
240 | /* | |
241 | * must be called after an execute | |
242 | */ | |
243 | static int statement_fetch_impl(lua_State *L, statement_t *statement, int named_columns) { | |
244 | int i; | |
245 | int d; | |
246 | ||
247 | SQLRETURN rc = SQL_SUCCESS; | |
248 | ||
249 | if (!statement->resultset || !statement->bind) { | |
250 | lua_pushnil(L); | |
251 | return 1; | |
252 | } | |
253 | ||
254 | /* fetch each row, and display */ | |
255 | rc = SQLFetch(statement->stmt); | |
256 | if (rc == SQL_NO_DATA_FOUND) { | |
257 | lua_pushnil(L); | |
258 | return 1; | |
259 | } | |
260 | ||
261 | d = 1; | |
262 | lua_newtable(L); | |
263 | for (i = 0; i < statement->num_result_columns; i++) { | |
264 | lua_push_type_t lua_push = db2_to_lua_push(statement->resultset[i].type, statement->bind[i].len); | |
265 | const char *name = strlower((char *)statement->resultset[i].name); | |
266 | double val; | |
267 | char *value = (char *)statement->bind[i].buffer; | |
268 | ||
269 | switch (lua_push) { | |
270 | case LUA_PUSH_NIL: | |
271 | if (named_columns) { | |
272 | LUA_PUSH_ATTRIB_NIL(name); | |
273 | } else { | |
274 | LUA_PUSH_ARRAY_NIL(d); | |
275 | } | |
276 | break; | |
277 | case LUA_PUSH_INTEGER: | |
278 | if (named_columns) { | |
279 | LUA_PUSH_ATTRIB_INT(name, atoi(value)); | |
280 | } else { | |
281 | LUA_PUSH_ARRAY_INT(d, atoi(value)); | |
282 | } | |
283 | break; | |
284 | case LUA_PUSH_NUMBER: | |
285 | val = strtod(value, NULL); | |
286 | ||
287 | if (named_columns) { | |
288 | LUA_PUSH_ATTRIB_FLOAT(name, val); | |
289 | } else { | |
290 | LUA_PUSH_ARRAY_FLOAT(d, val); | |
291 | } | |
292 | break; | |
293 | case LUA_PUSH_BOOLEAN: | |
294 | if (named_columns) { | |
295 | LUA_PUSH_ATTRIB_BOOL(name, atoi(value)); | |
296 | } else { | |
297 | LUA_PUSH_ARRAY_BOOL(d, atoi(value)); | |
298 | } | |
299 | break; | |
300 | case LUA_PUSH_STRING: | |
301 | if (named_columns) { | |
302 | LUA_PUSH_ATTRIB_STRING(name, value); | |
303 | } else { | |
304 | LUA_PUSH_ARRAY_STRING(d, value); | |
305 | } | |
306 | break; | |
307 | default: | |
308 | luaL_error(L, DBI_ERR_UNKNOWN_PUSH); | |
309 | } | |
310 | } | |
311 | ||
312 | return 1; | |
313 | } | |
314 | ||
315 | ||
316 | static int next_iterator(lua_State *L) { | |
317 | statement_t *statement = (statement_t *)luaL_checkudata(L, lua_upvalueindex(1), DBD_DB2_STATEMENT); | |
318 | int named_columns = lua_toboolean(L, lua_upvalueindex(2)); | |
319 | ||
320 | return statement_fetch_impl(L, statement, named_columns); | |
321 | } | |
322 | ||
323 | /* | |
324 | * table = statement:fetch(named_indexes) | |
325 | */ | |
326 | static int statement_fetch(lua_State *L) { | |
327 | statement_t *statement = (statement_t *)luaL_checkudata(L, 1, DBD_DB2_STATEMENT); | |
328 | int named_columns = lua_toboolean(L, 2); | |
329 | ||
330 | return statement_fetch_impl(L, statement, named_columns); | |
331 | } | |
332 | ||
333 | /* | |
334 | * iterfunc = statement:rows(named_indexes) | |
335 | */ | |
336 | static int statement_rows(lua_State *L) { | |
337 | if (lua_gettop(L) == 1) { | |
338 | lua_pushvalue(L, 1); | |
339 | lua_pushboolean(L, 0); | |
340 | } else { | |
341 | lua_pushvalue(L, 1); | |
342 | lua_pushboolean(L, lua_toboolean(L, 2)); | |
343 | } | |
344 | ||
345 | lua_pushcclosure(L, next_iterator, 2); | |
346 | return 1; | |
347 | } | |
348 | ||
349 | /* | |
350 | * __gc | |
351 | */ | |
352 | static int statement_gc(lua_State *L) { | |
353 | /* always free the handle */ | |
354 | statement_close(L); | |
355 | ||
356 | return 0; | |
357 | } | |
358 | ||
359 | int dbd_db2_statement_create(lua_State *L, connection_t *conn, const char *sql_query) { | |
360 | SQLRETURN rc = SQL_SUCCESS; | |
361 | statement_t *statement = NULL; | |
362 | SQLHANDLE stmt; | |
363 | ||
364 | SQLCHAR message[SQL_MAX_MESSAGE_LENGTH + 1]; | |
365 | SQLCHAR sqlstate[SQL_SQLSTATE_SIZE + 1]; | |
366 | SQLINTEGER sqlcode; | |
367 | SQLSMALLINT length; | |
368 | ||
369 | rc = SQLAllocHandle(SQL_HANDLE_STMT, conn->db2, &stmt); | |
370 | if (rc != SQL_SUCCESS) { | |
371 | SQLGetDiagRec(SQL_HANDLE_DBC, conn->db2, 1, sqlstate, &sqlcode, message, SQL_MAX_MESSAGE_LENGTH + 1, &length); | |
372 | ||
373 | lua_pushnil(L); | |
374 | lua_pushfstring(L, DBI_ERR_ALLOC_STATEMENT, message); | |
375 | return 2; | |
376 | } | |
377 | ||
378 | /* | |
379 | * turn off deferred prepare | |
380 | * statements will be sent to the server at prepare timr, | |
381 | * and therefor we can catch errors then rather | |
382 | * than at execute time | |
383 | */ | |
384 | rc = SQLSetStmtAttr(stmt,SQL_ATTR_DEFERRED_PREPARE,(SQLPOINTER)SQL_DEFERRED_PREPARE_OFF,0); | |
385 | ||
386 | rc = SQLPrepare(stmt, (SQLCHAR *)sql_query, SQL_NTS); | |
387 | if (rc != SQL_SUCCESS) { | |
388 | SQLGetDiagRec(SQL_HANDLE_STMT, stmt, 1, sqlstate, &sqlcode, message, SQL_MAX_MESSAGE_LENGTH + 1, &length); | |
389 | ||
390 | lua_pushnil(L); | |
391 | lua_pushfstring(L, DBI_ERR_PREP_STATEMENT, message); | |
392 | return 2; | |
393 | } | |
394 | ||
395 | statement = (statement_t *)lua_newuserdata(L, sizeof(statement_t)); | |
396 | statement->stmt = stmt; | |
397 | statement->db2 = conn->db2; | |
398 | statement->resultset = NULL; | |
399 | statement->bind = NULL; | |
400 | ||
401 | luaL_getmetatable(L, DBD_DB2_STATEMENT); | |
402 | lua_setmetatable(L, -2); | |
403 | ||
404 | return 1; | |
405 | } | |
406 | ||
407 | int dbd_db2_statement(lua_State *L) { | |
408 | static const luaL_Reg statement_methods[] = { | |
409 | {"close", statement_close}, | |
410 | {"execute", statement_execute}, | |
411 | {"fetch", statement_fetch}, | |
412 | {"rows", statement_rows}, | |
413 | {NULL, NULL} | |
414 | }; | |
415 | ||
416 | static const luaL_Reg statement_class_methods[] = { | |
417 | {NULL, NULL} | |
418 | }; | |
419 | ||
420 | luaL_newmetatable(L, DBD_DB2_STATEMENT); | |
421 | luaL_register(L, 0, statement_methods); | |
422 | lua_pushvalue(L,-1); | |
423 | lua_setfield(L, -2, "__index"); | |
424 | ||
425 | lua_pushcfunction(L, statement_gc); | |
426 | lua_setfield(L, -2, "__gc"); | |
427 | ||
428 | luaL_register(L, DBD_DB2_STATEMENT, statement_class_methods); | |
429 | ||
430 | return 1; | |
431 | } |