Fri, 19 Dec 2008 09:17:16 +0000
Added the statement:affected() and statement:rowcount() methods.
1 | 1 | #include "dbd_sqlite3.h" |
2 | ||
2 | 3 | /* |
4 | * Converts SQLite types to Lua types | |
5 | */ | |
1 | 6 | static lua_push_type_t sqlite_to_lua_push(unsigned int sqlite_type) { |
7 | lua_push_type_t lua_type; | |
8 | ||
9 | switch(sqlite_type) { | |
10 | case SQLITE_NULL: | |
11 | lua_type = LUA_PUSH_NIL; | |
12 | break; | |
13 | ||
14 | case SQLITE_INTEGER: | |
15 | lua_type = LUA_PUSH_INTEGER; | |
16 | break; | |
17 | ||
18 | case SQLITE_FLOAT: | |
19 | lua_type = LUA_PUSH_NUMBER; | |
20 | break; | |
21 | ||
22 | default: | |
23 | lua_type = LUA_PUSH_STRING; | |
24 | } | |
25 | ||
26 | return lua_type; | |
27 | } | |
28 | ||
2 | 29 | /* |
30 | * runs sqlite3_step on a statement handle | |
31 | */ | |
1 | 32 | static int step(statement_t *statement) { |
33 | int res = sqlite3_step(statement->stmt); | |
34 | ||
35 | if (res == SQLITE_DONE) { | |
36 | statement->more_data = 0; | |
37 | return 1; | |
38 | } else if (res == SQLITE_ROW) { | |
39 | statement->more_data = 1; | |
40 | return 1; | |
41 | } | |
42 | ||
43 | return 0; | |
44 | } | |
45 | ||
2 | 46 | /* |
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47 | * num_affected_rows = statement:affected() |
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48 | */ |
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49 | static int statement_affected(lua_State *L) { |
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50 | statement_t *statement = (statement_t *)luaL_checkudata(L, 1, DBD_SQLITE_STATEMENT); |
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51 | |
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52 | if (!statement->stmt) { |
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53 | luaL_error(L, DBI_ERR_INVALID_STATEMENT); |
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54 | } |
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55 | |
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56 | lua_pushinteger(L, statement->affected); |
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57 | |
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58 | return 1; |
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59 | } |
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60 | |
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61 | /* |
2 | 62 | * success = statement:close() |
63 | */ | |
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64 | static int statement_close(lua_State *L) { |
1 | 65 | statement_t *statement = (statement_t *)luaL_checkudata(L, 1, DBD_SQLITE_STATEMENT); |
66 | int ok = 0; | |
67 | ||
68 | if (statement->stmt) { | |
69 | if (sqlite3_finalize(statement->stmt) == SQLITE_OK) { | |
70 | ok = 1; | |
71 | } | |
3 | 72 | |
73 | statement->stmt = NULL; | |
1 | 74 | } |
75 | ||
76 | lua_pushboolean(L, ok); | |
77 | return 1; | |
78 | } | |
79 | ||
2 | 80 | /* |
3 | 81 | * success,err = statement:execute(...) |
2 | 82 | */ |
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83 | static int statement_execute(lua_State *L) { |
1 | 84 | int n = lua_gettop(L); |
85 | statement_t *statement = (statement_t *)luaL_checkudata(L, 1, DBD_SQLITE_STATEMENT); | |
86 | int p; | |
10 | 87 | int errflag = 0; |
88 | const char *errstr = NULL; | |
89 | int expected_params; | |
90 | int num_bind_params = n - 1; | |
3 | 91 | |
92 | if (!statement->stmt) { | |
93 | lua_pushboolean(L, 0); | |
4 | 94 | lua_pushstring(L, DBI_ERR_EXECUTE_INVALID); |
3 | 95 | return 2; |
96 | } | |
1 | 97 | |
2 | 98 | /* |
99 | * reset the handle before binding params | |
100 | * this wil be a NOP if the handle has not | |
101 | * been executed | |
102 | */ | |
1 | 103 | if (sqlite3_reset(statement->stmt) != SQLITE_OK) { |
104 | lua_pushboolean(L, 0); | |
4 | 105 | lua_pushfstring(L, DBI_ERR_EXECUTE_FAILED, sqlite3_errmsg(statement->sqlite)); |
3 | 106 | return 2; |
1 | 107 | } |
108 | ||
10 | 109 | expected_params = sqlite3_bind_parameter_count(statement->stmt); |
110 | if (expected_params != num_bind_params) { | |
111 | /* | |
112 | * sqlite3_reset does not handle this condition, | |
113 | * and the client library will fill unset params | |
114 | * with NULLs | |
115 | */ | |
116 | lua_pushboolean(L, 0); | |
117 | lua_pushfstring(L, DBI_ERR_PARAM_MISCOUNT, expected_params, num_bind_params); | |
118 | return 2; | |
119 | } | |
120 | ||
1 | 121 | for (p = 2; p <= n; p++) { |
122 | int i = p - 1; | |
9 | 123 | int type = lua_type(L, p); |
10 | 124 | char err[64]; |
9 | 125 | |
126 | switch(type) { | |
127 | case LUA_TNIL: | |
10 | 128 | errflag = sqlite3_bind_null(statement->stmt, i) != SQLITE_OK; |
9 | 129 | break; |
130 | case LUA_TNUMBER: | |
10 | 131 | errflag = sqlite3_bind_double(statement->stmt, i, lua_tonumber(L, p)) != SQLITE_OK; |
9 | 132 | break; |
133 | case LUA_TSTRING: | |
10 | 134 | errflag = sqlite3_bind_text(statement->stmt, i, lua_tostring(L, p), -1, SQLITE_STATIC) != SQLITE_OK; |
9 | 135 | break; |
136 | case LUA_TBOOLEAN: | |
10 | 137 | errflag = sqlite3_bind_int(statement->stmt, i, lua_toboolean(L, p)) != SQLITE_OK; |
9 | 138 | break; |
139 | default: | |
140 | /* | |
141 | * Unknown/unsupported value type | |
142 | */ | |
10 | 143 | errflag = 1; |
144 | snprintf(err, sizeof(err)-1, DBI_ERR_BINDING_TYPE_ERR, lua_typename(L, type)); | |
145 | errstr = err; | |
1 | 146 | } |
3 | 147 | |
10 | 148 | if (errflag) |
3 | 149 | break; |
1 | 150 | } |
151 | ||
10 | 152 | if (errflag) { |
3 | 153 | lua_pushboolean(L, 0); |
10 | 154 | if (errstr) |
155 | lua_pushfstring(L, DBI_ERR_BINDING_PARAMS, errstr); | |
156 | else | |
157 | lua_pushfstring(L, DBI_ERR_BINDING_PARAMS, sqlite3_errmsg(statement->sqlite)); | |
158 | ||
3 | 159 | return 2; |
160 | } | |
161 | ||
4 | 162 | if (!step(statement)) { |
163 | lua_pushboolean(L, 0); | |
164 | lua_pushfstring(L, DBI_ERR_EXECUTE_FAILED, sqlite3_errmsg(statement->sqlite)); | |
5 | 165 | return 2; |
4 | 166 | } |
167 | ||
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168 | statement->affected = sqlite3_changes(statement->sqlite); |
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169 | |
3 | 170 | lua_pushboolean(L, 1); |
1 | 171 | return 1; |
172 | } | |
173 | ||
2 | 174 | /* |
175 | * must be called after an execute | |
176 | */ | |
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177 | static int statement_fetch_impl(lua_State *L, statement_t *statement, int named_columns) { |
1 | 178 | int num_columns; |
179 | ||
3 | 180 | if (!statement->stmt) { |
4 | 181 | luaL_error(L, DBI_ERR_FETCH_INVALID); |
3 | 182 | return 0; |
183 | } | |
184 | ||
1 | 185 | if (!statement->more_data) { |
2 | 186 | /* |
187 | * Result set is empty, or not result set returned | |
188 | */ | |
189 | ||
1 | 190 | lua_pushnil(L); |
191 | return 1; | |
192 | } | |
193 | ||
194 | num_columns = sqlite3_column_count(statement->stmt); | |
195 | ||
196 | if (num_columns) { | |
197 | int i; | |
198 | int d = 1; | |
199 | ||
200 | lua_newtable(L); | |
201 | ||
202 | for (i = 0; i < num_columns; i++) { | |
203 | lua_push_type_t lua_push = sqlite_to_lua_push(sqlite3_column_type(statement->stmt, i)); | |
204 | const char *name = sqlite3_column_name(statement->stmt, i); | |
205 | ||
206 | if (lua_push == LUA_PUSH_NIL) { | |
207 | if (named_columns) { | |
208 | LUA_PUSH_ATTRIB_NIL(name); | |
209 | } else { | |
210 | LUA_PUSH_ARRAY_NIL(d); | |
211 | } | |
212 | } else if (lua_push == LUA_PUSH_INTEGER) { | |
213 | int val = sqlite3_column_int(statement->stmt, i); | |
214 | ||
215 | if (named_columns) { | |
216 | LUA_PUSH_ATTRIB_INT(name, val); | |
217 | } else { | |
218 | LUA_PUSH_ARRAY_INT(d, val); | |
219 | } | |
220 | } else if (lua_push == LUA_PUSH_NUMBER) { | |
221 | double val = sqlite3_column_double(statement->stmt, i); | |
222 | ||
223 | if (named_columns) { | |
224 | LUA_PUSH_ATTRIB_FLOAT(name, val); | |
225 | } else { | |
226 | LUA_PUSH_ARRAY_FLOAT(d, val); | |
227 | } | |
228 | } else if (lua_push == LUA_PUSH_STRING) { | |
229 | const char *val = (const char *)sqlite3_column_text(statement->stmt, i); | |
230 | ||
231 | if (named_columns) { | |
232 | LUA_PUSH_ATTRIB_STRING(name, val); | |
233 | } else { | |
234 | LUA_PUSH_ARRAY_STRING(d, val); | |
235 | } | |
236 | } else if (lua_push == LUA_PUSH_BOOLEAN) { | |
237 | int val = sqlite3_column_int(statement->stmt, i); | |
238 | ||
239 | if (named_columns) { | |
240 | LUA_PUSH_ATTRIB_BOOL(name, val); | |
241 | } else { | |
242 | LUA_PUSH_ARRAY_BOOL(d, val); | |
243 | } | |
244 | } else { | |
4 | 245 | luaL_error(L, DBI_ERR_UNKNOWN_PUSH); |
1 | 246 | } |
247 | } | |
2 | 248 | } else { |
249 | /* | |
250 | * no columns returned by statement? | |
251 | */ | |
252 | lua_pushnil(L); | |
1 | 253 | } |
254 | ||
255 | if (step(statement) == 0) { | |
256 | if (sqlite3_reset(statement->stmt) != SQLITE_OK) { | |
2 | 257 | /* |
258 | * reset needs to be called to retrieve the 'real' error message | |
259 | */ | |
4 | 260 | luaL_error(L, DBI_ERR_FETCH_FAILED, sqlite3_errmsg(statement->sqlite)); |
1 | 261 | } |
262 | } | |
263 | ||
264 | return 1; | |
265 | } | |
266 | ||
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267 | static int next_iterator(lua_State *L) { |
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268 | statement_t *statement = (statement_t *)luaL_checkudata(L, lua_upvalueindex(1), DBD_SQLITE_STATEMENT); |
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269 | int named_columns = lua_toboolean(L, lua_upvalueindex(2)); |
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270 | |
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271 | return statement_fetch_impl(L, statement, named_columns); |
1 | 272 | } |
273 | ||
2 | 274 | /* |
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275 | * table = statement:fetch(named_indexes) |
2 | 276 | */ |
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277 | static int statement_fetch(lua_State *L) { |
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278 | statement_t *statement = (statement_t *)luaL_checkudata(L, 1, DBD_SQLITE_STATEMENT); |
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279 | int named_columns = lua_toboolean(L, 2); |
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280 | |
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281 | return statement_fetch_impl(L, statement, named_columns); |
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282 | } |
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283 | |
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284 | /* |
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285 | * iterfunc = statement:rows(named_indexes) |
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286 | */ |
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287 | static int statement_rows(lua_State *L) { |
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288 | if (lua_gettop(L) == 1) { |
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289 | lua_pushvalue(L, 1); |
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290 | lua_pushboolean(L, 0); |
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291 | } else { |
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292 | lua_pushvalue(L, 1); |
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293 | lua_pushboolean(L, lua_toboolean(L, 2)); |
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294 | } |
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295 | |
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296 | lua_pushcclosure(L, next_iterator, 2); |
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297 | return 1; |
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298 | } |
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299 | |
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300 | /* |
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301 | * num_rows = statement:rowcount() |
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302 | */ |
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303 | static int statement_rowcount(lua_State *L) { |
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304 | luaL_error(L, DBI_ERR_NOT_IMPLEMENTED, DBD_SQLITE_STATEMENT, "rowcount"); |
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305 | |
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306 | return 0; |
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307 | } |
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308 | |
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309 | /* |
2 | 310 | * __gc |
311 | */ | |
1 | 312 | static int statement_gc(lua_State *L) { |
313 | /* always free the handle */ | |
314 | statement_close(L); | |
315 | ||
316 | return 0; | |
317 | } | |
318 | ||
319 | int dbd_sqlite3_statement_create(lua_State *L, connection_t *conn, const char *sql_query) { | |
320 | statement_t *statement = NULL; | |
321 | ||
322 | statement = (statement_t *)lua_newuserdata(L, sizeof(statement_t)); | |
323 | statement->sqlite = conn->sqlite; | |
324 | statement->stmt = NULL; | |
325 | statement->more_data = 0; | |
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326 | statement->affected = 0; |
1 | 327 | |
328 | if (sqlite3_prepare_v2(statement->sqlite, sql_query, strlen(sql_query), &statement->stmt, NULL) != SQLITE_OK) { | |
329 | lua_pushnil(L); | |
4 | 330 | lua_pushfstring(L, DBI_ERR_PREP_STATEMENT, sqlite3_errmsg(statement->sqlite)); |
3 | 331 | return 2; |
1 | 332 | } |
333 | ||
334 | luaL_getmetatable(L, DBD_SQLITE_STATEMENT); | |
335 | lua_setmetatable(L, -2); | |
336 | return 1; | |
337 | } | |
338 | ||
339 | int dbd_sqlite3_statement(lua_State *L) { | |
2 | 340 | static const luaL_Reg statement_methods[] = { |
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341 | {"affected", statement_affected}, |
2 | 342 | {"close", statement_close}, |
343 | {"execute", statement_execute}, | |
344 | {"fetch", statement_fetch}, | |
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345 | {"rows", statement_rows}, |
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346 | {"rowcount", statement_rowcount}, |
2 | 347 | {NULL, NULL} |
348 | }; | |
349 | ||
350 | static const luaL_Reg statement_class_methods[] = { | |
351 | {NULL, NULL} | |
352 | }; | |
353 | ||
1 | 354 | luaL_newmetatable(L, DBD_SQLITE_STATEMENT); |
355 | luaL_register(L, 0, statement_methods); | |
356 | lua_pushvalue(L,-1); | |
357 | lua_setfield(L, -2, "__index"); | |
358 | ||
359 | lua_pushcfunction(L, statement_gc); | |
360 | lua_setfield(L, -2, "__gc"); | |
361 | ||
362 | luaL_register(L, DBD_SQLITE_STATEMENT, statement_class_methods); | |
363 | ||
364 | return 1; | |
365 | } |