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databaseModel.js
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databaseModel.js
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if(!dojo._hasResource["dojox.grid.tests.databaseModel"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dojox.grid.tests.databaseModel"] = true;
dojo.provide("dojox.grid.tests.databaseModel");
dojo.require("dojox.grid._data.model");
// Provides a sparse array that is also traversable inorder
// with basic Array:
// - iterating by index is slow for large sparse arrays
// - for...in iteration is in order of element creation
// maintains a secondary index for interating
// over sparse elements inorder
dojo.declare("dojox.grid.Sparse", null, {
constructor: function() {
this.clear();
},
clear: function() {
this.indices = [];
this.values = [];
},
length: function() {
return this.indices.length;
},
set: function(inIndex, inValue) {
for (var i=0,l=this.indices.length; i<l; i++) {
if (this.indices[i] >= inIndex)
break;
}
if (this.indices[i] != inIndex)
this.indices.splice(i, 0, inIndex);
this.values[inIndex] = inValue;
},
get: function(inIndex) {
return this.values[inIndex];
},
remove: function(inIndex) {
for (var i=0,l=this.indices.length; i<l; i++)
if (this.indices[i] == inIndex) {
this.indices.splice(i, 1);
break;
}
delete this.values[inIndex];
},
inorder: function(inFor) {
for (var i=0,l=this.indices.length, ix; i<l; i++) {
ix = this.indices[i];
if (inFor(this.values[ix], ix) === false)
break;
}
}
});
// sample custom model implementation that works with mysql server.
dojo.declare("dojox.grid.data.DbTable", dojox.grid.data.Dynamic, {
delayedInsertCommit: true,
constructor: function(inFields, inData, inServer, inDatabase, inTable) {
this.server = inServer;
this.database = inDatabase;
this.table = inTable;
this.stateNames = ['inflight', 'inserting', 'removing', 'error'];
this.clearStates();
this.clearSort();
},
clearData: function() {
this.cache = [ ];
this.clearStates();
this.inherited(arguments);
},
clearStates: function() {
this.states = {};
for (var i=0, s; (s=this.stateNames[i]); i++) {
delete this.states[s];
this.states[s] = new dojox.grid.Sparse();
}
},
// row state information
getState: function(inRowIndex) {
for (var i=0, r={}, s; (s=this.stateNames[i]); i++)
r[s] = this.states[s].get(inRowIndex);
return r;
},
setState: function(inRowIndex, inState, inValue) {
this.states[inState].set(inRowIndex, inValue||true);
},
clearState: function(inRowIndex, inState) {
if (arguments.length == 1) {
for (var i=0, s; (s=this.stateNames[i]); i++)
this.states[s].remove(inRowIndex);
} else {
for (var i=1, l=arguments.length, arg; (i<l) &&((arg=arguments[i])!=undefined); i++)
this.states[arg].remove(inRowIndex);
}
},
setStateForIndexes: function(inRowIndexes, inState, inValue) {
for (var i=inRowIndexes.length-1, k; (i>=0) && ((k=inRowIndexes[i])!=undefined); i--)
this.setState(k, inState, inValue);
},
clearStateForIndexes: function(inRowIndexes, inState) {
for (var i=inRowIndexes.length-1, k; (i>=0) && ((k=inRowIndexes[i])!=undefined); i--)
this.clearState(k, inState);
},
//$ Return boolean stating whether or not an operation is in progress that may change row indexing.
isAddRemoving: function() {
return Boolean(this.states['inserting'].length() || this.states['removing'].length());
},
isInflight: function() {
return Boolean(this.states['inflight'].length());
},
//$ Return boolean stating if the model is currently undergoing any type of edit.
isEditing: function() {
for (var i=0, r={}, s; (s=this.stateNames[i]); i++)
if (this.states[s].length())
return true;
},
//$ Return true if ok to modify the given row. Override as needed, using model editing state information.
canModify: function(inRowIndex) {
return !this.getState(inRowIndex).inflight && !(this.isInflight() && this.isAddRemoving());
},
// server send / receive
getSendParams: function(inParams) {
var p = {
database: this.database || '',
table: this.table || ''
}
return dojo.mixin(p, inParams || {});
},
send: function(inAsync, inParams, inCallbacks) {
//console.log('send', inParams.command);
var p = this.getSendParams(inParams);
var d = dojo.xhrPost({
url: this.server,
content: p,
handleAs: 'json-comment-filtered',
contentType: "application/x-www-form-urlencoded; charset=utf-8",
sync: !inAsync
});
d.addCallbacks(dojo.hitch(this, "receive", inCallbacks), dojo.hitch(this, "receiveError", inCallbacks));
return d;
},
_callback: function(cb, eb, data) {
try{ cb && cb(data); }
catch(e){ eb && eb(data, e); }
},
receive: function(inCallbacks, inData) {
inCallbacks && this._callback(inCallbacks.callback, inCallbacks.errback, inData);
},
receiveError: function(inCallbacks, inErr) {
this._callback(inCallbacks.errback, null, inErr)
},
encodeRow: function(inParams, inRow, inPrefix) {
for (var i=0, l=inRow.length; i < l; i++)
inParams['_' + (inPrefix ? inPrefix : '') + i] = (inRow[i] ? inRow[i] : '');
},
measure: function() {
this.send(true, { command: 'info' }, { callback: dojo.hitch(this, this.callbacks.info) });
},
fetchRowCount: function(inCallbacks) {
this.send(true, { command: 'count' }, inCallbacks);
},
// server commits
commitEdit: function(inOldData, inNewData, inRowIndex, inCallbacks) {
this.setState(inRowIndex, "inflight", true);
var params = {command: 'update'};
this.encodeRow(params, inOldData, 'o');
this.encodeRow(params, inNewData);
this.send(true, params, inCallbacks);
},
commitInsert: function(inRowIndex, inNewData, inCallbacks) {
this.setState(inRowIndex, "inflight", true);
var params = {command: 'insert'};
this.encodeRow(params, inNewData);
this.send(true, params, inCallbacks);
},
// NOTE: supported only in tables with pk
commitDelete: function(inRows, inCallbacks) {
var params = {
command: 'delete',
count: inRows.length
}
var pk = this.getPkIndex();
if (pk < 0)
return;
for (var i=0; i < inRows.length; i++) {
params['_' + i] = inRows[i][pk];
}
this.send(true, params, inCallbacks);
},
getUpdateCallbacks: function(inRowIndex) {
return {
callback: dojo.hitch(this, this.callbacks.update, inRowIndex),
errback: dojo.hitch(this, this.callbacks.updateError, inRowIndex)
};
},
// primary key from fields
getPkIndex: function() {
for (var i=0, l=this.fields.count(), f; (i<l) && (f=this.fields.get(i)); i++)
if (f.Key = 'PRI')
return i;
return -1;
},
// model implementations
update: function(inOldData, inNewData, inRowIndex) {
var cbs = this.getUpdateCallbacks(inRowIndex);
if (this.getState(inRowIndex).inserting)
this.commitInsert(inRowIndex, inNewData, cbs);
else
this.commitEdit(this.cache[inRowIndex] || inOldData, inNewData, inRowIndex, cbs);
// set push data immediately to model so reflectd while committing
this.setRow(inNewData, inRowIndex);
},
insert: function(inData, inRowIndex) {
this.setState(inRowIndex, 'inserting', true);
if (!this.delayedInsertCommit)
this.commitInsert(inRowIndex, inData, this.getUpdateCallbacks(inRowIndex));
return this.inherited(arguments);
},
remove: function(inRowIndexes) {
var rows = [];
for (var i=0, r=0, indexes=[]; (r=inRowIndexes[i]) !== undefined; i++)
if (!this.getState(r).inserting) {
rows.push(this.getRow(r));
indexes.push(r);
this.setState(r, 'removing');
}
var cbs = {
callback: dojo.hitch(this, this.callbacks.remove, indexes),
errback: dojo.hitch(this, this.callbacks.removeError, indexes)
};
this.commitDelete(rows, cbs);
dojox.grid.data.Dynamic.prototype.remove.apply(this, arguments);
},
cancelModifyRow: function(inRowIndex) {
if (this.isDelayedInsert(inRowIndex)) {
this.removeInsert(inRowIndex);
} else
this.finishUpdate(inRowIndex);
},
finishUpdate: function(inRowIndex, inData) {
this.clearState(inRowIndex);
var d = (inData&&inData[0]) || this.cache[inRowIndex];
if (d)
this.setRow(d, inRowIndex);
delete this.cache[inRowIndex];
},
isDelayedInsert: function(inRowIndex) {
return (this.delayedInsertCommit && this.getState(inRowIndex).inserting);
},
removeInsert: function(inRowIndex) {
this.clearState(inRowIndex);
dojox.grid.data.Dynamic.prototype.remove.call(this, [inRowIndex]);
},
// request data
requestRows: function(inRowIndex, inCount) {
var params = {
command: 'select',
orderby: this.sortField,
desc: (this.sortDesc ? "true" : ''),
offset: inRowIndex,
limit: inCount
}
this.send(true, params, {callback: dojo.hitch(this, this.callbacks.rows, inRowIndex)});
},
// sorting
canSort: function () {
return true;
},
setSort: function(inSortIndex) {
this.sortField = this.fields.get(Math.abs(inSortIndex) - 1).name || inSortIndex;
this.sortDesc = (inSortIndex < 0);
},
sort: function(inSortIndex) {
this.setSort(inSortIndex);
this.clearData();
},
clearSort: function(){
this.sortField = '';
this.sortDesc = false;
},
endModifyRow: function(inRowIndex){
var cache = this.cache[inRowIndex];
var m = false;
if(cache){
var data = this.getRow(inRowIndex);
if(!dojox.grid.arrayCompare(cache, data)){
m = true;
this.update(cache, data, inRowIndex);
}
}
if (!m)
this.cancelModifyRow(inRowIndex);
},
// server callbacks (called with this == model)
callbacks: {
update: function(inRowIndex, inData) {
console.log('received update', arguments);
if (inData.error)
this.updateError(inData)
else
this.finishUpdate(inRowIndex, inData);
},
updateError: function(inRowIndex) {
this.clearState(inRowIndex, 'inflight');
this.setState(inRowIndex, "error", "update failed: " + inRowIndex);
this.rowChange(this.getRow(inRowIndex), inRowIndex);
},
remove: function(inRowIndexes) {
this.clearStateForIndexes(inRowIndexes);
},
removeError: function(inRowIndexes) {
this.clearStateForIndexes(inRowIndexes);
alert('Removal error. Please refresh.');
},
rows: function(inRowIndex, inData) {
//this.beginUpdate();
for (var i=0, l=inData.length; i<l; i++)
this.setRow(inData[i], inRowIndex + i);
//this.endUpdate();
//this.allChange();
},
count: function(inRowCount) {
this.count = Number(inRowCount);
this.clearData();
},
info: function(inInfo) {
this.fields.clear();
for (var i=0, c; (c=inInfo.columns[i]); i++) {
c.name = c.Field;
this.fields.set(i, c);
}
this.table = inInfo.table;
this.database = inInfo.database;
this.notify("MetaData", arguments);
this.callbacks.count.call(this, inInfo.count);
}
}
});
}

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