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var designer_tables = [{name: "pdf_pages", key: "pg_nr", auto_inc: true},
{name: "table_coords", key: "id", auto_inc: true}];
var DesignerOfflineDB = (function () {
var designerDB = {};
var datastore = null;
designerDB.open = function (callback) {
var version = 1;
var request = window.indexedDB.open("pma_designer", version);
request.onupgradeneeded = function (e) {
var db = e.target.result;
e.target.transaction.onerror = designerDB.onerror;
for (var t in designer_tables) {
if (db.objectStoreNames.contains(designer_tables[t].name)) {
db.deleteObjectStore(designer_tables[t].name);
}
}
for (var t in designer_tables) {
db.createObjectStore(designer_tables[t].name, {
keyPath: designer_tables[t].key,
autoIncrement: designer_tables[t].auto_inc
});
}
};
request.onsuccess = function (e) {
datastore = e.target.result;
if (typeof callback !== 'undefined' && callback !== null) {
callback(true);
}
};
request.onerror = designerDB.onerror;
};
designerDB.loadObject = function (table, id, callback) {
var db = datastore;
var transaction = db.transaction([table], 'readwrite');
var objStore = transaction.objectStore(table);
var cursorRequest = objStore.get(parseInt(id));
cursorRequest.onsuccess = function (e) {
callback(e.target.result);
};
cursorRequest.onerror = designerDB.onerror;
};
designerDB.loadAllObjects = function (table, callback) {
var db = datastore;
var transaction = db.transaction([table], 'readwrite');
var objStore = transaction.objectStore(table);
var keyRange = IDBKeyRange.lowerBound(0);
var cursorRequest = objStore.openCursor(keyRange);
var results = [];
transaction.oncomplete = function (e) {
callback(results);
};
cursorRequest.onsuccess = function (e) {
var result = e.target.result;
if (Boolean(result) === false) {
return;
}
results.push(result.value);
result.continue();
};
cursorRequest.onerror = designerDB.onerror;
};
designerDB.loadFirstObject = function(table, callback) {
var db = datastore;
var transaction = db.transaction([table], 'readwrite');
var objStore = transaction.objectStore(table);
var keyRange = IDBKeyRange.lowerBound(0);
var cursorRequest = objStore.openCursor(keyRange);
var firstResult = null;
transaction.oncomplete = function(e) {
callback(firstResult);
};
cursorRequest.onsuccess = function(e) {
var result = e.target.result;
if (Boolean(result) === false) {
return;
}
firstResult = result.value;
};
cursorRequest.onerror = designerDB.onerror;
};
designerDB.addObject = function(table, obj, callback) {
var db = datastore;
var transaction = db.transaction([table], 'readwrite');
var objStore = transaction.objectStore(table);
var request = objStore.put(obj);
request.onsuccess = function(e) {
if (typeof callback !== 'undefined' && callback !== null) {
callback(e.currentTarget.result);
}
};
request.onerror = designerDB.onerror;
};
designerDB.deleteObject = function(table, id, callback) {
var db = datastore;
var transaction = db.transaction([table], 'readwrite');
var objStore = transaction.objectStore(table);
var request = objStore.delete(parseInt(id));
request.onsuccess = function(e) {
if (typeof callback !== 'undefined' && callback !== null) {
callback(true);
}
};
request.onerror = designerDB.onerror;
};
designerDB.onerror = function(e) {
console.log(e);
};
// Export the designerDB object.
return designerDB;
}());