dubbo RPCcontext 分析

MongoDB实现case when 和 id in的查询

db.store.aggregate([{
    $project: {
        "nczStoreId": 1,
        "storeName": 1,
        "groupIds": 1,
        "priority": {
            $cond: { if: { $setIsSubset: [ "$groupIds",[1000] ]}, then: 1, else: 0 }
        }
    }
}])

放回当groupIds集合中包含1000 返回auth=true

$cond 判断表达式文档
https://docs.mongodb.com/v3.2/meta/aggregation-quick-reference/#expressions

它有下面几种表达式判断

Boolean Expressions

$and $or 用于表达式嵌套
result: { $and: [ { $gt: [ “$qty”, 100 ] }, { $lt: [ “$qty”, 250 ] } ] }

Set Expressions

判断集合是否包含 $setIsSubset

ComparisonExpressions

$eq $gt

Arithmetic Expressions

用来做计算$abs $floor

String Expressions

字符串运算
$concat $substr

Text Search expressions

$meta

Array Expressions

$size

Date Expressions

等等

JavaAPI实现

BasicDBObject bson = new BasicDBObject();
    bson.put("$eval","db.store.aggregate([{\n" +
            "    $project: {\n" +
            "        \"nczStoreId\": 1,\n" +
            "        \"storeName\": 1,\n" +
            "        \"groupIds\": 1,\n" +
            "        \"auth\": {\n" +
            "            $cond: { if: { $setIsSubset: [ \"$groupIds\",[1000] ]}, then: true, else: false }\n" +
            "        }\n" +
            "    }\n" +
            "}])");
    Object o=mongoTemplate.getDb().runCommand(bson);
    System.out.println(o.toString());

Servlet笔记

HttpServletRequest

GET http://localhost:8080/test?a=1

request.getRequestURL();

http://localhost:8080/test

request.getRequestURI();

/test

request.getQueryString();

a=1

技术笔记Notes