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Mongoimport before the import, the new database does not have the same XX table can be imported successfully;
Mongoexport and Mongoimport The order of each parameter input is not strict;
For a replica set, the data export of Mongoexport can be a primary node in a replica set, or it can be a secondary node;
For a replica set, the data import of Mongoimport m
Tags: work rem move except info valueof stat Mapper QueryIn the actual project, the MongoDB database is often used for caching, MongoDB concurrency is relatively high, so for fast storage, read information has many advantages. In the project, the database is accessed directly for the first data request, and the information obtained is usually deposited into mongodb
(Student stu:teacher.getStudentListList ()) {
System.out.println ("Student ID:" + stu.getid () + ", Name:" + Stu.getname () + ", Age:" + stu.getage ());}}
The code is simple, because the code that GPB generates helps us do it. The basic use of the above, we focus on the GPB and JSON to generate file size differences, JSON detailed code I will n
Since JSON-formatted files are highly convenient to work with and produce a large number of XML-formatted files every day, there is a need to convert XML-formatted files into JSON-formatted files.Directly below the code, there are two versions, according to the requirements of the free choice:#!/usr/bin/python# -*- coding: utf-8 -*-#Function:Xml_To_Json#version 1.0#Author: Herman#需要用到的两个模块
in the spring configuration file, you need to add a sentence configuration to open the @responsebody annotation:@ResponseBody annotations can be written on a class or method, written on a class that takes effect on all methods in that class, and the code example is as follows:package org.zero01.test;import org.springframework.stereotype.Controller;import org.spr
This article teaches you how to store the JSON content that you configure under the project in the MongoDB database when the project is started.As we all know, Spring Boo Project T is started with a main function. So we want to be able to do something at the start (that is, listen for startup events). By looking at the Spring Boot document (http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/h
Because the document structure of MongoDB is in the Bjson format (bjson full name: Binary JSON), and the Bjson format itself supports data in binary format, you can save the data in binary format of the file directly into the MongoDB document structure. However, because the maximum length of a bjson cannot exceed 4M, i
(Fileentity.getinputstream ());} else {throw new RuntimeException ("The upload file format is incorrect!) ");}return workbook;}/*** Data turned into list* @param sheet Stream* @param cellname Object data columns, as with entity characters* @param RowNum starting from the first few lines* @param cellnum starting from the first few columns* @return return list*/public static listListfor (int i = rowNum; I Row row = Sheet.getrow (i);mapfor (int v=cellnu
Copy Code code as follows:
Import java.io.*;
/*** Created by Tang on 14-3-1.*/public class Jsonutils {
To read a JSON file from a given locationpublic static string Readjson (string path) {Get files from a given locationFile File = new file (path);BufferedReader r
MongoDB is a non-relational database (NOSQL) that implements object-oriented thinking (Oo thought), and each record in MONGO DB is a document object. The biggest advantage of Mongo DB is that all data persistence requires no developers to write SQL statements manually, and it is easy to invoke methods to implement CRUD operations.This blog mainly describes how MongoDB stores and read files.MongoDB operation
API
API
Annotation
Json.dumps ()
Converts a dictionary in Python to a string
Json.loads ()
Convert a string to a dictionary
Json.dump (,)
Write data to the JSON file
Json.load ()
To open the file and transform the string into a data type
Test
1. Import of Log4j2First download the latest LOG4J2 jar package to http://logging.apache.org/log4j/2.x/download.html, Then add Log4j-api-2.4.1.jar and Log4j-core-2.4.1.jar to eclipse, and be careful not to import all the jars into the project causing unnecessary clutter.2.LogEventThe left vertical bar is the level of event, and the right bar is the level of loggerconfig (that is, filter). Yes means that the
Getfromassets (string fileName) {try {InputStreamReader Inputreader = new InputStreamReader (Getresources (). Getassets (). Open (FileName));BufferedReader bufreader = new BufferedReader (Inputreader);String line= "";String result= "";while (line = Bufreader.readline ()) = null)Result + = line;return Result;} catch (Exception e) {E.printstacktrace ();}}Of course, if you want to get the memory stream, you can return to the memory stream directly!Then set up a layout
First step (note the project file name do not take into json.py)
Import JSON
Second Step
First read into the JSON file, assuming that in D disk Inputjson
Inputjson=open ("D://inputjson.txt"). Read ()
The Read method can read all of the contents
And then there's an err
address -- target java-gen-t json-a NONE
Now you can find the generated java class file under the java-gen folder. To use these class files in an Android project, you need to delete @ Generated (com. googlecode. jsonschema2pojo). Note: address is the json data to be converted.
Example:
Json data test.
Import JsonitemexporterIn addition to Jsonitemexporter,scrapy offers a variety of types of exporterclassJsonexporterpipeline (object):#call the JSON export JSON file provided by Scrapy def __init__(self):#Open a JSON fileSelf.file = open ('Articleexport.json','WB')
Example of how to parse a json file in python,
Preface
JSON (JavaScript Object Notation) is a lightweight data exchange format. It is based on a subset of JavaScript (Standard ECMA-262 3rd Edition-December 1999. JSON uses a completely language-independent text format, but it also uses a habit similar to the C language
': [40.218102,-111.613297]}3. List-GeneratedSee: http://www.cnblogs.com/janes/p/5530979.htmlsecond, parse the JSON file into a dictionary listTo parse the JSON file, we first read the file line by row, converting each line into the corresponding Dictionary object, and then f
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