1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
/* This file will include set of functions
* to store, retrieve and modify data from database.
*/
.import QtQuick.LocalStorage 2.0 as SQL
/* For internal usage in module.
*/
var gDbCache = undefined
function openStdDataBase() {
if (gDbCache === undefined)
gDbCache = SQL.LocalStorage.openDatabaseSync("RSS Reader", "1.0", "Feed DB", 10000)
return gDbCache
}
function ensureFeedTableExists(transaction) {
transaction.executeSql('CREATE TABLE IF NOT EXISTS UserFeeds(link STRING PRIMARY KEY, displayName STRING, siteLink STRING, description STRING)')
}
function ensureEntriesTableExists(transaction) {
transaction.executeSql('CREATE TABLE IF NOT EXISTS FeedEntries(feedLink STRING, title STRING, pubDate STRING, hash STRING, description TEXT, content TEXT)')
}
/* Internal module usage end. */
/* This variable will store result of any operation with database.
*/
//var dbResult
/* Load all feed from database.
* Mb later we will need some criteria, such as tag, date and so on!
*/
function loadFeeds() {
var db = openStdDataBase()
var dbResultLocal
var feeds
db.transaction(function(tx) {
ensureFeedTableExists(tx)
dbResultLocal = tx.executeSql("SELECT * FROM UserFeeds")
console.log("SELECTED: ", dbResultLocal.rows.length)
feeds = dbResultLocal.rows
}
)
return feeds;
}
/* Add feed to database.
* Now only 3 fields, later - more (date, tag and etc.)
*/
function addFeed(d) {
if (d.link === undefined) {
console.log("Database, AddFeed: 0.link can't be empty")
return
}
var dbResult
d.displayName = d.displayName || ""
d.siteLink = d.siteLink || ""
d.description = d.description || ""
var db = openStdDataBase()
db.transaction(function (tx) {
ensureFeedTableExists(tx)
/* Check uniqueness.
*/
dbResult = tx.executeSql("SELECT * FROM UserFeeds WHERE link=?", [d.link])
if (dbResult.rows.length > 0) {
console.log("Database, addFeed: already exist feed with link", d.link)
dbResult.exist = true // TODO TMP, mb need string with error, will see later.
return
}
dbResult = tx.executeSql('INSERT INTO UserFeeds VALUES(?, ?, ?, ?)',
[d.link , d.displayName, d.siteLink, d.description])
console.log("INSERT ID", dbResult.insertId)
}
)
return dbResult
}
/* Update information about feed with new information.
*/
function updateFeedWithInfo(link, d) {
var db = openStdDataBase()
var dbResult
db.transaction(function (tx) {
ensureFeedTableExists(tx)
dbResult = tx.executeSql('UPDATE UserFeeds SET displayName=?, siteLink=?, description=? WHERE link=?',
[d.displayName, d.siteLink, d.description, link])
console.log("UPDATE, AFFECTED ROWS", dbResult.rowsAffected)
}
)
return dbResult
}
/* Delete feed from database.
*/
function deleteFeed(link) {
var db = openStdDataBase()
var result
db.transaction(function (tx) {
var dbResultLocal
ensureFeedTableExists(tx)
dbResultLocal = tx.executeSql('DELETE FROM UserFeeds WHERE link = ?', [link])
console.log("DELETE, AFFECTED ROWS", dbResultLocal.rowsAffected)
result = dbResultLocal
}
)
return result
}
/* Select all entries from database.
*/
function loadEntries(feedLink, all) {
all = all || false
var db = openStdDataBase()
var entries;
db.transaction(function(tx) {
ensureEntriesTableExists(tx)
var dbResultLocal
if (all)
dbResultLocal = tx.executeSql('SELECT * FROM FeedEntries')
else dbResultLocal = tx.executeSql('SELECT * FROM FeedEntries WHERE feedLink = ?', [feedLink])
console.log("loadEntries, SELECTED ROWS", dbResultLocal.rows.length)
entries = dbResultLocal.rows;
}
)
return entries;
}
/* Select all entries from database.
*/
function loadFeed(feedLink) {
var db = openStdDataBase()
var feed = {displayName: "Unknown"}
db.transaction(function(tx) {
ensureEntriesTableExists(tx)
var dbResult = tx.executeSql('SELECT * FROM UserFeeds WHERE link = ?', [feedLink])
console.log("feedName, SELECTED ROWS", dbResult.rows.length)
if(dbResult.rows.length > 0) {
feed = dbResult.rows.item(0)
}
}
)
return feed
}
/* Append entry to database.
*/
function addEntry(feedLink, hash, d) {
var db = openStdDataBase()
var dbResult
if (feedLink === undefined || hash === undefined) {
console.log("Database, addEntry: feedLink and hash can't be undefined")
return
}
db.transaction(function(tx) {
ensureEntriesTableExists(tx)
/* Check uniqueness.
*/
dbResult = tx.executeSql("SELECT * FROM FeedEntries WHERE hash=?", [hash])
if (dbResult.rows.length > 0) {
console.log("Database, addEntry: already exist entry with hash", hash)
dbResult.exist = true
return
}
dbResult = tx.executeSql('INSERT INTO FeedEntries VALUES(?, ?, ?, ?, ?, ?)',
[feedLink, d.title, d.pubDate, hash, d.description, d.content])
// console.log("ENTRY INSERT ID", dbResult.insertId)
}
)
return dbResult
}
/* Remove all entries from database by feed link.
*/
function removeEntriesOfFeed(feedLink) {
var db = openStdDataBase()
var dbResult
db.transaction(function(tx) {
ensureEntriesTableExists(tx)
dbResult = tx.executeSql('DELETE FROM FeedEntries WHERE feedLink = ?', [feedLink])
}
)
return dbResult
}
/* Only for debug purposes.
*/
function dropTables() {
var db = openStdDataBase()
db.transaction(function(tx) {
tx.executeSql("DROP TABLE IF EXISTS UserFeeds")
tx.executeSql("DROP TABLE IF EXISTS FeedEntries")
console.log("DATABASE DELETED")
}
)
}
|