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define(["jQuery", "sqlite_driver"], function ($, SQLite_driver) {
var SQLjs_driver = function () {
this.db = null;
return this;
}
$.extend(SQLjs_driver.prototype,SQLite_driver.prototype); // inherit from parent class
SQLjs_driver.prototype.buildSchema = function (args) {
var _this = this; // preserve reference to current object through local closures
try {
/*
* Closure used to handle both cases of when the sql.js library
* has already been loaded, or when it has not yet been.
*/
var jsBuildSchema = function () {
_this.db = SQL.open();
$.each(SQLite_driver.prototype.splitStatement.call(this,args["ddl"],args["statement_separator"]), function (i, statement) {
_this.db.exec(statement);
});
args["success"]();
}
// If the sql.js code isn't yet loaded, do it now.
if (window.SQL === undefined)
{
$.getScript("javascripts_static/sql.js", function (script, textStatus, jqXHR) {
jsBuildSchema();
}).fail(function(jqxhr, settings, exception){
args["error"]("Your browser does not work with SQL.js. Try using a different browser (Chrome, Safari, Firefox, IE 10, etc...), or a newer version of your current one.");
});
}
else
{
if (_this.db)
{
_this.db.close();
}
jsBuildSchema();
}
}
catch (e)
{
args["error"](e);
}
}
SQLjs_driver.prototype.executeQuery = function (args) {
var _this = this; // preserve reference to current object through local closures
try {
if (! _this.db)
{
throw ("Database Schema not available!");
}
var returnSets = [];
_this.db.exec("BEGIN TRANSACTION");
$.each(SQLite_driver.prototype.splitStatement.call(this,args["sql"],args["statement_separator"]), function (i, statement) {
if ($.trim(statement).length) {
var startTime = new Date();
var setArray = [];
try {
setArray = _this.db.exec(statement);
var thisSet = {
"SUCCEEDED": true,
"EXECUTIONTIME": (new Date()) - startTime,
"RESULTS": {
"COLUMNS": [],
"DATA": []
},
"EXECUTIONPLAN": {
"COLUMNS": [],
"DATA": []
}
};
if (setArray.length) {
$.each(setArray, function(rowNumber, row){
var rowVals = [];
$.each(row, function(columnNumber, col){
if (rowNumber == 0) {
thisSet["RESULTS"]["COLUMNS"].push(col.column);
}
rowVals.push(col.value);
});
thisSet["RESULTS"]["DATA"].push(rowVals);
});
}
try {
exectionPlanArray = _this.db.exec("EXPLAIN QUERY PLAN " + statement);
if (exectionPlanArray.length) {
$.each(exectionPlanArray, function(rowNumber, row){
var rowVals = [];
$.each(row, function(columnNumber, col){
if (rowNumber == 0) {
thisSet["EXECUTIONPLAN"]["COLUMNS"].push(col.column);
}
rowVals.push(col.value);
});
thisSet["EXECUTIONPLAN"]["DATA"].push(rowVals);
});
}
}
catch (e) {
// if we get an error with the execution plan, just ignore and move on.
}
returnSets.push(thisSet);
}
catch (e) {
var thisSet = {
"SUCCEEDED": false,
"EXECUTIONTIME": (new Date()) - startTime,
"ERRORMESSAGE": e
};
returnSets.push(thisSet);
return false; // breaks the each loop
}
}
});
_this.db.exec("ROLLBACK TRANSACTION");
args["success"](returnSets);
}
catch (e)
{
args["error"](e);
}
}
return SQLjs_driver;
});
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