如何在MongoDB中从字符串转换为日期数据类型？
要将String从String转换为date数据类型，您需要编写一些脚本。首先让我们创建一个包含文档的集合
>db.stringToDateDataTypeDemo.insertOne({"CustomerName":"Carol","ShippingDate":"2019-
01-21"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ca2071d66324ffac2a7dc60")
}
>db.stringToDateDataTypeDemo.insertOne({"CustomerName":"Bob","ShippingDate":"2019-
02-24"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ca2073566324ffac2a7dc61")
}
>db.stringToDateDataTypeDemo.insertOne({"CustomerName":"Chris","ShippingDate":"2019-
04-01"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ca2074266324ffac2a7dc62")
}以下是在find()方法的帮助下显示集合中所有文档的查询
> db.stringToDateDataTypeDemo.find().pretty();
这将产生以下输出
{
"_id" : ObjectId("5ca2071d66324ffac2a7dc60"),
"CustomerName" : "Carol",
"ShippingDate" : "2019-01-21"
}
{
"_id" : ObjectId("5ca2073566324ffac2a7dc61"),
"CustomerName" : "Bob",
"ShippingDate" : "2019-02-24"
}
{
"_id" : ObjectId("5ca2074266324ffac2a7dc62"),
"CustomerName" : "Chris",
"ShippingDate" : "2019-04-01"
}以下是将String转换为日期数据类型的查询
> db.stringToDateDataTypeDemo.find().forEach(function(data){
... data.ShippingDate= ISODate(data.ShippingDate);
... db.stringToDateDataTypeDemo.save(data);
... });让我们再次显示所有文档，以检查字符串是否转换为日期数据类型。以下是查询
> db.stringToDateDataTypeDemo.find().pretty();
这将产生以下输出
{
"_id" : ObjectId("5ca2071d66324ffac2a7dc60"),
"CustomerName" : "Carol",
"ShippingDate" : ISODate("2019-01-21T00:00:00Z")
}
{
"_id" : ObjectId("5ca2073566324ffac2a7dc61"),
"CustomerName" : "Bob",
"ShippingDate" : ISODate("2019-02-24T00:00:00Z")
}
{
"_id" : ObjectId("5ca2074266324ffac2a7dc62"),
"CustomerName" : "Chris",
"ShippingDate" : ISODate("2019-04-01T00:00:00Z")
}