目前我正在开发一个 Java 项目，我需要使用 Java 运行 JavaScript Mongo 查询。我发现我可以使用db.eval(). 问题是我对 Mongo 有以下 JavaScript 查询，但我不知道如何将整个脚本传递给该db.eval()方法。
var red = function(doc, out) {
out.count_order++;
out.sum_qty += doc.quantity;
out.sum_base_price += doc.extendedprice;
out.sum_disc_price += doc.extendedprice * (1 - doc.discount);
out.sum_charge += doc.extendedprice * (1 - doc.discount) * (1 + doc.tax);
out.avg_disc += doc.discount
};
var avg = function(out) {
out.avg_qty = out.sum_qty / out.count_order;
out.avg_price = out.sum_base_price / out.count_order;
out.avg_disc = out.avg_disc / out.count_order
};
db.deals.group( {
key : { RETURNFLAG : true, LINESTATUS : true},
cond : { "SHIPDATE" : {$lte: new Date(1998, 8, 1)}},
initial: { count_order : 0, sum_qty : 0, sum_base_price : 0, sum_disc_price : 0,
sum_charge : 0, avg_disc : 0},
reduce : red,
finalize : avg
});