重命名MongoDB集合中的列名？
要重命名集合中的列名，可以使用$rename运算符。以下是语法
db.yourCollectionName.update({}, {$rename: {'yourOldColumName': 'yourNewColumnName'}}, false, true);让我们首先创建一个包含文档的集合：
> db.renamingColumnNameDemo.insertOne({"StudentName":"Larry","Age":23});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9ee2c6d628fa4220163b9a")
}
> db.renamingColumnNameDemo.insertOne({"StudentName":"Sam","Age":26});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9ee2d0d628fa4220163b9b")
}
> db.renamingColumnNameDemo.insertOne({"StudentName":"Robert","Age":27});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9ee2dbd628fa4220163b9c")
}以下是在find()方法的帮助下显示集合中所有文档的查询
> db.renamingColumnNameDemo.find().pretty();
这将产生以下输出
{
"_id" : ObjectId("5c9ee2c6d628fa4220163b9a"),
"StudentName" : "Larry",
"Age" : 23
}
{
"_id" : ObjectId("5c9ee2d0d628fa4220163b9b"),
"StudentName" : "Sam",
"Age" : 26
}
{
"_id" : ObjectId("5c9ee2dbd628fa4220163b9c"),
"StudentName" : "Robert",
"Age" : 27
}以下是重命名MongoDB集合中列名称的查询
> db.renamingColumnNameDemo.update({}, {$rename: {'Age': 'StudentAge'}}, false, true);
WriteResult({ "nMatched" : 3, "nUpserted" : 0, "nModified" : 3 })现在检查“年龄”列是否已使用“StudentAge”重命名
> db.renamingColumnNameDemo.find().pretty();
这将产生以下输出
{
"_id" : ObjectId("5c9ee2c6d628fa4220163b9a"),
"StudentName" : "Larry",
"StudentAge" : 23
}
{
"_id" : ObjectId("5c9ee2d0d628fa4220163b9b"),
"StudentName" : "Sam",
"StudentAge" : 26
}
{
"_id" : ObjectId("5c9ee2dbd628fa4220163b9c"),
"StudentName" : "Robert",
"StudentAge" : 27
}