MongoDB笔记四——查询操作
db.persons.find({"$where":function(){ //得到查询结果的每一条文档var books = this.books;
//得到文档中的school对象
var school = this.school;
//如果年纪>=22
if(this.age > 22){
var php = null;
//遍历书籍
for ( var i = 0; i < books.length; i++) {
if(books == "C++"){
php = books;
//如果学校是真
if(school){
for (var j = 0; j < school.length; j++) {
//判断是不是在K上学
if(school.school == "K"){
//返回是真
return true;
}
}
break;
}
}
}
}
}})
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