如何在MongoDB中打印脚本结果？
我们将printjson()为此使用。首先让我们创建一个包含文档的集合-
> dbprintResultScriptDemoinsertOne({"StudentName":"John","StudentAge":21});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cf22c02b64a577be5a2bc0b")
}
> dbprintResultScriptDemoinsertOne({"StudentName":"Carol","StudentAge":20});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cf22c09b64a577be5a2bc0c")
}
> dbprintResultScriptDemoinsertOne({"StudentName":"David","StudentAge":19});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cf22c11b64a577be5a2bc0d")
}以下是在find()方法的帮助下显示集合中所有文档的查询-
> dbprintResultScriptDemofind();
这将产生以下文件-
{ "_id" : ObjectId("5cf22c02b64a577be5a2bc0b"), "StudentName" : "John", "StudentAge" : 21 }
{ "_id" : ObjectId("5cf22c09b64a577be5a2bc0c"), "StudentName" : "Carol", "StudentAge" : 20 }
{ "_id" : ObjectId("5cf22c11b64a577be5a2bc0d"), "StudentName" : "David", "StudentAge" : 19 }以下是打印脚本结果的查询-
> var document=dbprintResultScriptDemofind();
> while (documenthasNext()) {
printjson(documentnext());
}这将产生以下文件-
{
"_id" : ObjectId("5cf22c02b64a577be5a2bc0b"),
"StudentName" : "John",
"StudentAge" : 21
}
{
"_id" : ObjectId("5cf22c09b64a577be5a2bc0c"),
"StudentName" : "Carol",
"StudentAge" : 20
}
{
"_id" : ObjectId("5cf22c11b64a577be5a2bc0d"),
"StudentName" : "David",
"StudentAge" : 19
}