1 | /**********************************************************************
|
---|
2 | *
|
---|
3 | * sqlitedbclass.cpp --
|
---|
4 | * Copyright (C) 2008 DL Consulting Ltd
|
---|
5 | *
|
---|
6 | * A component of the Greenstone digital library software
|
---|
7 | * from the New Zealand Digital Library Project at the
|
---|
8 | * University of Waikato, New Zealand.
|
---|
9 | *
|
---|
10 | * This program is free software; you can redistribute it and/or modify
|
---|
11 | * it under the terms of the GNU General Public License as published by
|
---|
12 | * the Free Software Foundation; either version 2 of the License, or
|
---|
13 | * (at your option) any later version.
|
---|
14 | *
|
---|
15 | * This program is distributed in the hope that it will be useful,
|
---|
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
---|
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
---|
18 | * GNU General Public License for more details.
|
---|
19 | *
|
---|
20 | * You should have received a copy of the GNU General Public License
|
---|
21 | * along with this program; if not, write to the Free Software
|
---|
22 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
---|
23 | *
|
---|
24 | *********************************************************************/
|
---|
25 |
|
---|
26 | #include "sqlitedbclass.h"
|
---|
27 | #include "unitool.h"
|
---|
28 |
|
---|
29 |
|
---|
30 | #define SQLITE_MAX_RETRIES 8
|
---|
31 |
|
---|
32 |
|
---|
33 | sqlitedbclass::~sqlitedbclass()
|
---|
34 | {
|
---|
35 | closedatabase();
|
---|
36 | }
|
---|
37 |
|
---|
38 |
|
---|
39 | // returns true if opened
|
---|
40 | bool sqlitedbclass::opendatabase (const text_t &filename, int mode, int num_retrys,
|
---|
41 | #ifdef __WIN32__
|
---|
42 | bool need_filelock
|
---|
43 | #else
|
---|
44 | bool
|
---|
45 | #endif
|
---|
46 | )
|
---|
47 | {
|
---|
48 | // Check if we've already got the database open
|
---|
49 | if (sqlitefile != NULL)
|
---|
50 | {
|
---|
51 | if (openfile == filename) return true;
|
---|
52 | else closedatabase();
|
---|
53 | }
|
---|
54 |
|
---|
55 | char *filename_cstr = filename.getcstr();
|
---|
56 | sqlite3_open(filename_cstr, &sqlitefile);
|
---|
57 | delete[] filename_cstr;
|
---|
58 |
|
---|
59 | if (sqlitefile == NULL)
|
---|
60 | {
|
---|
61 | (*logout) << "ERROR: sqlitedbclass::opendatabase() failed on: " << filename << "\n";
|
---|
62 | return false;
|
---|
63 | }
|
---|
64 |
|
---|
65 | if ((mode == DB_WRITER || mode == DB_WRITER_CREATE) && !sqltableexists("data"))
|
---|
66 | {
|
---|
67 | sqlexec("CREATE TABLE data (key TEXT, value TEXT, PRIMARY KEY(key))");
|
---|
68 | }
|
---|
69 |
|
---|
70 | return true;
|
---|
71 | }
|
---|
72 |
|
---|
73 |
|
---|
74 | void sqlitedbclass::closedatabase ()
|
---|
75 | {
|
---|
76 | if (sqlitefile == NULL) return;
|
---|
77 |
|
---|
78 | sqlite3_close(sqlitefile);
|
---|
79 | sqlitefile = NULL;
|
---|
80 | openfile.clear();
|
---|
81 | }
|
---|
82 |
|
---|
83 |
|
---|
84 | void sqlitedbclass::deletekey (const text_t &key)
|
---|
85 | {
|
---|
86 | text_t sql_cmd = "DELETE FROM data WHERE key='" + key + "'";
|
---|
87 | sqlexec(sql_cmd);
|
---|
88 | }
|
---|
89 |
|
---|
90 |
|
---|
91 | // returns file extension string
|
---|
92 | text_t sqlitedbclass::getfileextension ()
|
---|
93 | {
|
---|
94 | return ".db";
|
---|
95 | }
|
---|
96 |
|
---|
97 |
|
---|
98 | // returns true on success
|
---|
99 | bool sqlitedbclass::getkeydata (const text_t& key, text_t &data)
|
---|
100 | {
|
---|
101 | text_t sql_cmd = "SELECT value FROM data WHERE key='" + key + "'";
|
---|
102 | vector<text_tmap> sql_results;
|
---|
103 | if (!sqlgetarray(sql_cmd, sql_results) || sql_results.size() == 0)
|
---|
104 | {
|
---|
105 | return false;
|
---|
106 | }
|
---|
107 |
|
---|
108 | text_tmap sql_result = sql_results[0];
|
---|
109 | data = sql_result["value"];
|
---|
110 | return true;
|
---|
111 | }
|
---|
112 |
|
---|
113 |
|
---|
114 | // returns array of keys
|
---|
115 | text_tarray sqlitedbclass::getkeys ()
|
---|
116 | {
|
---|
117 | text_tarray keys;
|
---|
118 |
|
---|
119 | // Get all the entries in the "key" column of the table
|
---|
120 | text_t sql_cmd = "SELECT key FROM data";
|
---|
121 | vector<text_tmap> sql_results;
|
---|
122 | if (!sqlgetarray(sql_cmd, sql_results) || sql_results.size() == 0)
|
---|
123 | {
|
---|
124 | return keys;
|
---|
125 | }
|
---|
126 |
|
---|
127 | // Iterate through the keys and add them to the array to be returned
|
---|
128 | vector<text_tmap>::iterator sql_results_iterator = sql_results.begin();
|
---|
129 | while (sql_results_iterator != sql_results.end())
|
---|
130 | {
|
---|
131 | text_tmap sql_result = (*sql_results_iterator);
|
---|
132 | keys.push_back(sql_result["key"]);
|
---|
133 | sql_results_iterator++;
|
---|
134 | }
|
---|
135 |
|
---|
136 | return keys;
|
---|
137 | }
|
---|
138 |
|
---|
139 |
|
---|
140 | // returns true on success
|
---|
141 | bool sqlitedbclass::setkeydata (const text_t &key, const text_t &data)
|
---|
142 | {
|
---|
143 | // We need to do either an INSERT or UPDATE depending on whether the key already exists
|
---|
144 | if (!exists(key))
|
---|
145 | {
|
---|
146 | text_t sql_cmd = "INSERT INTO data (key, value) VALUES ('" + key + "', '" + data + "')";
|
---|
147 | return sqlexec(sql_cmd);
|
---|
148 | }
|
---|
149 | else
|
---|
150 | {
|
---|
151 | text_t sql_cmd = "UPDATE data SET value='" + data + "' WHERE key='" + key + "'";
|
---|
152 | return sqlexec(sql_cmd);
|
---|
153 | }
|
---|
154 | }
|
---|
155 |
|
---|
156 |
|
---|
157 | // ----------------------------------------------------------------------------------------
|
---|
158 | // SQLITE-ONLY FUNCTIONS
|
---|
159 | // ----------------------------------------------------------------------------------------
|
---|
160 |
|
---|
161 | // sqlexec simply executes the given sql statement - it doesn't obtain a
|
---|
162 | // result set - returns true if the sql statement was executed successfully
|
---|
163 | bool sqlitedbclass::sqlexec(const text_t &sql_cmd)
|
---|
164 | {
|
---|
165 | if (sqlitefile == NULL) return false;
|
---|
166 |
|
---|
167 | char *sql_cmd_cstr = sql_cmd.getcstr();
|
---|
168 |
|
---|
169 | int rv = 0;
|
---|
170 | int tries = 0;
|
---|
171 | while ((rv = sqlite3_exec(sqlitefile, sql_cmd_cstr, NULL, NULL, NULL)) == SQLITE_BUSY)
|
---|
172 | {
|
---|
173 | sleep(1000);
|
---|
174 | tries++;
|
---|
175 | if (tries > SQLITE_MAX_RETRIES)
|
---|
176 | {
|
---|
177 | outconvertclass text_t2ascii;
|
---|
178 | (*logout) << text_t2ascii << "max_retries exceeded for sql query: " << sql_cmd << "\n";
|
---|
179 | break;
|
---|
180 | }
|
---|
181 | }
|
---|
182 |
|
---|
183 | delete[] sql_cmd_cstr;
|
---|
184 |
|
---|
185 | if (rv == SQLITE_OK) return true;
|
---|
186 |
|
---|
187 | // sqlite3_exec failed - return false
|
---|
188 | outconvertclass text_t2ascii;
|
---|
189 | (*logout) << text_t2ascii << "Error executing sql statement: " << sql_cmd << "\n";
|
---|
190 | return false;
|
---|
191 | }
|
---|
192 |
|
---|
193 |
|
---|
194 | // callback functions for sqlgetarray
|
---|
195 | static int sqlgetarray_callback(void *res, int numcols, char **vals, char **columnnames)
|
---|
196 | {
|
---|
197 | vector<text_tmap> *result = (vector<text_tmap>*) res;
|
---|
198 | text_tmap row;
|
---|
199 |
|
---|
200 | for (int i = 0; i < numcols; i++)
|
---|
201 | {
|
---|
202 | row[columnnames[i]] = "";
|
---|
203 | // vals[i] will be NULL if set to a NULL db value
|
---|
204 | if (vals[i])
|
---|
205 | {
|
---|
206 | row[columnnames[i]] = vals[i];
|
---|
207 | }
|
---|
208 | }
|
---|
209 |
|
---|
210 | result->push_back(row);
|
---|
211 | return 0;
|
---|
212 | }
|
---|
213 |
|
---|
214 |
|
---|
215 | // sqlgetarray executes sql and returns the result set in sql_results
|
---|
216 | bool sqlitedbclass::sqlgetarray(const text_t &sql_cmd, vector<text_tmap> &sql_results)
|
---|
217 | {
|
---|
218 | if (sqlitefile == NULL) return false;
|
---|
219 |
|
---|
220 | char *sql_cmd_cstr = sql_cmd.getcstr();
|
---|
221 | sql_results.erase(sql_results.begin(), sql_results.end());
|
---|
222 |
|
---|
223 | int rv = 0;
|
---|
224 | int tries = 0;
|
---|
225 | while ((rv = sqlite3_exec(sqlitefile, sql_cmd_cstr, sqlgetarray_callback, &sql_results, NULL)) == SQLITE_BUSY)
|
---|
226 | {
|
---|
227 | sleep(1000);
|
---|
228 | tries++;
|
---|
229 | if (tries > SQLITE_MAX_RETRIES)
|
---|
230 | {
|
---|
231 | outconvertclass text_t2ascii;
|
---|
232 | (*logout) << text_t2ascii << "max_retries exceeded for sql query: " << sql_cmd << "\n";
|
---|
233 | break;
|
---|
234 | }
|
---|
235 | }
|
---|
236 |
|
---|
237 | delete[] sql_cmd_cstr;
|
---|
238 |
|
---|
239 | if (rv == SQLITE_OK) return true;
|
---|
240 |
|
---|
241 | // sqlite3_exec failed - return empty result set
|
---|
242 | outconvertclass text_t2ascii;
|
---|
243 | (*logout) << text_t2ascii << "Error executing sql statement: " << sql_cmd << "\n";
|
---|
244 | return false;
|
---|
245 | }
|
---|
246 |
|
---|
247 |
|
---|
248 | // returns true if exists
|
---|
249 | bool sqlitedbclass::sqltableexists(const text_t &table_name)
|
---|
250 | {
|
---|
251 | text_t sql_cmd = "SELECT * FROM sqlite_master WHERE tbl_name='" + table_name + "'";
|
---|
252 | vector<text_tmap> sql_results;
|
---|
253 | if (!sqlgetarray(sql_cmd, sql_results) || sql_results.size() == 0)
|
---|
254 | {
|
---|
255 | return false;
|
---|
256 | }
|
---|
257 |
|
---|
258 | return true;
|
---|
259 | }
|
---|
260 |
|
---|
261 |
|
---|
262 | // sleep for the given number of milliseconds
|
---|
263 | void sleep(int m)
|
---|
264 | {
|
---|
265 | #ifdef __WIN32__
|
---|
266 | Sleep(m);
|
---|
267 | #else
|
---|
268 | usleep(m);
|
---|
269 | #endif
|
---|
270 | }
|
---|