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
|
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
// A simple class to represent a database. Uses XMLHttpRequest to interface with
// the CouchDB server.
function CouchDB(name) {
this.name = name
this.uri = "/" + encodeURIComponent(name) + "/";
request = CouchDB.request;
// Creates the database on the server
this.createDb = function() {
var req = request("PUT", this.uri);
var result = JSON.parse(req.responseText);
if (req.status != 201)
throw result;
return result;
}
// Deletes the database on the server
this.deleteDb = function() {
var req = request("DELETE", this.uri);
if (req.status == 404)
return false;
var result = JSON.parse(req.responseText);
if (req.status != 202)
throw result;
return result;
}
// Save a document to the database
this.save = function(doc, options) {
var req;
if (doc._id == undefined)
req = request("POST", this.uri + encodeOptions(options), {
body: JSON.stringify(doc)
});
else
req = request("PUT", this.uri + encodeURIComponent(doc._id) + encodeOptions(options), {
body: JSON.stringify(doc)
});
var result = JSON.parse(req.responseText);
if (req.status != 201)
throw result;
// set the _id and _rev members on the input object, for caller convenience.
doc._id = result.id;
doc._rev = result.rev;
return result;
}
// Open a document from the database
this.open = function(docId, options) {
var req = request("GET", this.uri + encodeURIComponent(docId) + encodeOptions(options));
if (req.status == 404)
return null;
var result = JSON.parse(req.responseText);
if (req.status != 200)
throw result;
return result;
}
// Deletes a document from the database
this.deleteDoc = function(doc) {
var req = request("DELETE", this.uri + encodeURIComponent(doc._id) + "?rev=" + doc._rev);
var result = JSON.parse(req.responseText);
if (req.status != 202)
throw result;
doc._rev = result.rev; //record rev in input document
doc._deleted = true;
return result;
}
this.bulkSave = function(docs, options) {
var req = request("POST", this.uri + "_bulk_docs" + encodeOptions(options), {
body: JSON.stringify({"docs": docs})
});
var result = JSON.parse(req.responseText);
if (req.status != 201)
throw result;
return result;
}
// Applies the map function to the contents of database and returns the results.
this.query = function(mapFun, options) {
if (typeof(mapFun) != "string")
mapFun = mapFun.toSource ? mapFun.toSource() : "(" + mapFun.toString() + ")";
var req = request("POST", this.uri + "_temp_view" + encodeOptions(options), {
headers: {"Content-Type": "text/javascript"},
body: mapFun
});
var result = JSON.parse(req.responseText);
if (req.status != 200)
throw result;
return result;
}
this.view = function(viewname, options) {
var req = request("GET", this.uri + "_view/" + viewname + encodeOptions(options));
if (req.status == 404)
return null;
var result = JSON.parse(req.responseText);
if (req.status != 200)
throw result;
return result;
}
// gets information about the database
this.info = function() {
var req = request("GET", this.uri);
var result = JSON.parse(req.responseText);
if (req.status != 200)
throw result;
return result;
}
this.allDocs = function(options) {
var req = request("GET", this.uri + "_all_docs" + encodeOptions(options));
var result = JSON.parse(req.responseText);
if (req.status != 200)
throw result;
return result;
}
// Convert a options object to an url query string.
// ex: {key:'value',key2:'value2'} becomes '?key="value"&key2="value2"'
function encodeOptions(options) {
var buf = []
if (typeof(options) == "object" && options !== null) {
for (var name in options) {
if (!options.hasOwnProperty(name)) continue;
var value = options[name];
if (name == "key" || name == "startkey" || name == "endkey") {
value = toJSON(value);
}
buf.push(encodeURIComponent(name) + "=" + encodeURIComponent(value));
}
}
if (!buf.length) {
return "";
}
return "?" + buf.join("&");
}
function toJSON(obj) {
return obj !== null ? JSON.stringify(obj) : null;
}
}
CouchDB.allDbs = function() {
var req = CouchDB.request("GET", "/_all_dbs");
var result = JSON.parse(req.responseText);
if (req.status != 200)
throw result;
return result;
}
CouchDB.getVersion = function() {
var req = CouchDB.request("GET", "/");
var result = JSON.parse(req.responseText);
if (req.status != 200)
throw result;
return result.version;
}
CouchDB.replicate = function(source, target) {
var req = CouchDB.request("POST", "/_replicate", {
body: JSON.stringify({source: source, target: target})
});
var result = JSON.parse(req.responseText);
if (req.status != 200)
throw result;
return result;
}
CouchDB.request = function(method, uri, options) {
options = options || {};
var req = null;
if (typeof(XMLHttpRequest) != "undefined") {
req = new XMLHttpRequest();
} else if (typeof(ActiveXObject) != "undefined") {
req = new ActiveXObject("Microsoft.XMLHTTP");
} else {
throw new Error("No XMLHTTPRequest support detected");
}
req.open(method, uri, false);
if (options.headers) {
var headers = options.headers;
for (var headerName in headers) {
if (!headers.hasOwnProperty(headerName)) continue;
req.setRequestHeader(headerName, headers[headerName]);
}
}
req.send(options.body || null);
return req;
}
|
