alasql-utility.js
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function alasql_QUERY (data, fields, filters, aggregators, orders) {
if(fields.length == 0)
return [];
var _fields = _addParenthesis(fields);
var select = _alasql_SELECT(_fields);
var where = "";
if(filters && filters.length) {
var _filters = _copy(filters);
where = _alasql_WHERE(_filters);
}
var orderBy = "";
if(orders && orders.length) {
var _orders = _copy(orders);
orderBy = _alasql_ORDERBY(_orders);
}
var groupBy = "";
if(aggregators && aggregators.length) {
var _aggregators = _copy(aggregators);
groupBy = _alasql_GROUPBY(_aggregators);
select = groupBy[0];
groupBy = groupBy[1];
}
var query = select + " FROM ?" + where + " " + groupBy + " " + orderBy;
return alasql(query, [data]);
}
function _alasql_SELECT (fields) {
var select = "SELECT ";
if(fields[0] == "*")
return select += "*";
for (var i = 0; i < fields.length; i++)
select += fields[i] + ", ";
return select.slice(0, -2);
}
function _alasql_WHERE (filters) {
var where = " WHERE ";
var logicalOperator;
/*DEPRECATED*/if(filters[0].logicalOperator == undefined) {
logicalOperator = "AND"
}
else {
logicalOperator = filters[0].logicalOperator;
filters = filters.slice(1);
}
for (var i=0; i < filters.length; i++)
filters[i]["field"] = _normalizeField(filters[i]["field"]);
for (var i=0; i < filters.length; i++) {
if(filters[i]["operation"] == "contains")
where += filters[i]["field"] + " like '%" + filters[i]["value"] + "%' " + logicalOperator + " ";
else if(filters[i]["operation"] == "notContains")
where += filters[i]["field"] + " not like '%" + filters[i]["value"] + "%' " + logicalOperator + " ";
else if(filters[i]["operation"] == "start")
where += filters[i]["field"] + " like '" + filters[i]["value"] + "%' " + logicalOperator + " ";
else if(filters[i]["operation"] == "ends")
where += filters[i]["field"] + " like '%" + filters[i]["value"] + "' " + logicalOperator + " ";
else
where += filters[i]["field"] + " " + filters[i]["operation"] + " " + filters[i]["value"] + " " + logicalOperator + " ";
}
return where.slice(0, -4);
}
function _alasql_GROUPBY (aggregators) {
for (var i=0; i < aggregators.length; i++)
aggregators[i]["field"] = _normalizeField(aggregators[i]["field"]);
var select = "SELECT ";
var groupBy = "GROUP BY ";
for (var i = 0; i < aggregators.length; i++) {
if(aggregators[i]["operation"] == "GROUP BY") {
select += aggregators[i]["field"] + ", ";
groupBy += aggregators[i]["field"] + ", ";
}
else
select += aggregators[i]["operation"] + "(" + aggregators[i]["field"] + ") as " + aggregators[i]["field"] + ", ";
}
return [select.slice(0, -2), groupBy.slice(0, -2)];
}
function _alasql_ORDERBY (orders) {
for (var i=0; i < orders.length; i++)
orders[i]["field"] = _normalizeField(orders[i]["field"]);
var orderBy = "ORDER BY ";
for (var i = 0; i < orders.length; i++)
orderBy += orders[i]["field"] + " " + orders[i]["operation"] + ", ";
return orderBy.slice(0, -2);
}
function _addParenthesis (fields) {
var result = [];
for (var i=0; i < fields.length; i++)
result.push(_normalizeField(fields[i]));
return result;
}
function _normalizeField (field) {
return "[" + field + "]";
}
function alasql_transformData (data, fields, truncate) {
if(!data || data.length == 0)
return [];
var tData = [];
for (var i in fields){
var field = fields[i];
var values = [];
for (var i in data) {
var v = data[i][field];
if(truncate)
if(!isNaN(v) && v % 1 != 0)
v = Math.floor(v * 100) / 100;
values.push(v);
}
tData.push({
name: field,
data: values
});
}
return tData;
};
function _copy (o) {
var out, v, key;
out = Array.isArray(o) ? new Array(o.length) : {};
for (key in o) {
v = o[key];
out[key] = (typeof v === "object") ? this._copy(v) : v;
}
return out;
}