MongoDB打印不带空格的JSON，即不正确的JSON？
要打印不漂亮的json，请使用以下语法-
var yourVariableName= db.yourCollectionName.find().sort({_id:-1}).limit(10000);
while( yourVariableName.hasNext() ) {
printjsononeline(yourVariableName.next() );
};为了理解语法，让我们用文档创建一个集合。使用文档创建集合的查询如下-
> db.unprettyJsonDemo.insertOne({"StudentName":"John","StudentAge":21,"StudentTechnicalSkills":["C","C++"]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c900df25705caea966c557d")
}
> db.unprettyJsonDemo.insertOne({"StudentName":"Carol","StudentAge":22,"StudentTechnicalSkills":["MongoDB","MySQL"]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c900e085705caea966c557e")
}find()方法帮助下集合中的所有文档。查询如下-
> db.unprettyJsonDemo.find().pretty();
以下是输出-
{
"_id" : ObjectId("5c900df25705caea966c557d"),
"StudentName" : "John",
"StudentAge" : 21,
"StudentTechnicalSkills" : [
"C",
"C++"
]
}
{
"_id" : ObjectId("5c900e085705caea966c557e"),
"StudentName" : "Carol",
"StudentAge" : 22,
"StudentTechnicalSkills" : [
"MongoDB",
"MySQL"
]
}这是打印不带空格的JSON的查询，即不正确的JSON-
> var myCursor = db.unprettyJsonDemo.find().sort({_id:-1}).limit(10000);
> while(myCursor.hasNext()){
... printjsononeline(myCursor.next());
... };以下是输出-
{ "_id" : ObjectId("5c900e085705caea966c557e"), "StudentName" : "Carol", "StudentAge" : 22, "StudentTechnicalSkills" : [ "MongoDB", "MySQL" ] }
{ "_id" : ObjectId("5c900df25705caea966c557d"), "StudentName" : "John", "StudentAge" : 21, "StudentTechnicalSkills" : [ "C", "C++" ] }