NoSQL和关系数据库的操作比较

实验环境

1、操作系统:Linux(建议Ubuntu16.04);

2、Hadoop版本:2.7.1;

3、MySQL版本:5.6;

4、HBase版本:1.1.2;

5、Redis版本:3.0.6;

6、MongoDB版本:3.2.6;

7、JDK版本:1.7或以上版本;

8、Java IDE:Eclipse;

实验目的:

1、理解四种数据库(MySQL、HBase、Redis和MongoDB)的概念以及不同点;

2、熟练使用四种数据库操作常用的Shell命令;

3、熟悉四种数据库操作常用的Java API。

 

实验步骤:

(一) MySQL数据库操作

学生表Student

Name

English

Math

Computer

zhangsan

69

86

77

lisi

55

100

88

根据上面给出的Student表,在MySQL数据库中完成如下操作:

(1)在MySQL中创建Student表,并录入数据;

 

(2)用SQL语句输出Student表中的所有记录;

 

(3)查询zhangsan的Computer成绩;

 

(4)修改lisi的Math成绩,改为95。

 

        

根据上面已经设计出的Student表,使用MySQL的JAVA客户端编程实现以下操作:

(1)向Student表中添加如下所示的一条记录:

scofield

45

89

100

 

(2)获取scofield的English成绩信息

package com.mysql;

import java.sql.*;

public class MysqlTest {

static final String DRIVER = "com.mysql.jdbc.Driver";

static final String DB = "jdbc:mysql://localhost/test?useUnicode=true&characterEncoding=utf-8&useSSL=false";

static final String USER = "root";

static final String PASSWD = "hadoop";

public static void main(String[] args) {

Connection conn = null;

Statement stmt = null;

try {

Class.forName(DRIVER);

System.out.println("Connecting to a selected database...");

conn = DriverManager.getConnection(DB, USER, PASSWD);

stmt = conn.createStatement();

String sql = "insert into student values('scofield',45,89,100)";

stmt.executeUpdate(sql);

System.out.println("Inserting records into the table successfully!");

} catch (ClassNotFoundException e) {

e.printStackTrace();

} catch (SQLException e) {

e.printStackTrace();

} finally {

if (stmt != null)

try {

stmt.close();

} catch (SQLException e) {

e.printStackTrace();

}

if (conn != null)

try {

conn.close();

} catch (SQLException e) {

e.printStackTrace();

}

}

}

}

 

 

(二)HBase数据库操作

学生表Student

     name

score

English

Math

Computer

zhangsan

69

86

77

lisi

55

100

88

根据上面给出的学生表Student的信息,执行如下操作:

(1)用Hbase Shell命令创建学生表Student;

 

 

(2)用scan命令浏览Student表的相关信息;

 

(3)查询zhangsan的Computer成绩;

 

(4)修改lisi的Math成绩,改为95。

 

 

2.根据上面已经设计出的Student表,用HBase API编程实现以下操作:

(1)添加数据:English:45  Math:89 Computer:100

scofield

45

89

100

 

(2)获取scofield的English成绩信息。

public class HbaseTest {

public static Configuration configuration;

public static Connection connection;

public static Admin admin;

public static void main(String[] args) {

configuration = HBaseConfiguration.create();

configuration.set("hbase.rootdir", "hdfs://localhost:9000/hbase");

try {

connection = ConnectionFactory.createConnection(configuration);

admin = connection.getAdmin();

} catch (IOException e) {

e.printStackTrace();

}

try {

insertRow("student", "scofield", "score", "English", "45");

insertRow("student", "scofield", "score", "Math", "89");

insertRow("student", "scofield", "score", "Computer", "100");

} catch (IOException e) {

e.printStackTrace();

}

close();

}

public static void insertRow(String tableName, String rowKey,

String colFamily, String col, String val) throws IOException {

Table table = connection.getTable(TableName.valueOf(tableName));

Put put = new Put(rowKey.getBytes());

put.addColumn(colFamily.getBytes(), col.getBytes(), val.getBytes());

table.put(put);

table.close();

}

public static void close() {

try {

if (admin != null) {

admin.close();

}

if (null != connection) {

connection.close();

}

} catch (IOException e) {

e.printStackTrace();

}

}

}

 

 

 

(三)Redis数据库操作

Student键值对如下:

zhangsan:{

English: 69

Math: 86

Computer: 77

lisi:{

English: 55

Math: 100

Computer: 88

 

1. 根据上面给出的键值对,完成如下操作:

(1)用Redis的哈希结构设计出学生表Student(键值可以用student.zhangsan和student.lisi来表示两个键值属于同一个表);

   

(3)用hgetall命令分别输出zhangsan和lisi的成绩信息;

 

 

(4)用hget命令查询zhangsan的Computer成绩;

 

(5)修改lisi的Math成绩,改为95。

 

 

2.根据上面已经设计出的学生表Student,用Redis的JAVA客户端编程(jedis),实现如下操作:

(1)添加数据:English:45  Math:89 Computer:100

该数据对应的键值对形式如下:

scofield:{

English: 45

Math: 89

Computer: 100

import java.util.Map;

import redis.clients.jedis.Jedis;

public class test {

public static void main(String[] args) {

Jedis jedis = new Jedis("localhost");

jedis.hset("student.scofield", "English", "45");

jedis.hset("student.scofield", "Math", "89");

jedis.hset("student.scofield", "Computer", "100");

Map<String, String> value = jedis.hgetAll("student.scofield");

for (Map.Entry<String, String> entry : value.entrySet()) {

System.out.println(entry.getKey() + ":" + entry.getValue());

}

}

}

 

 

(2)获取scofield的English成绩信息

import redis.clients.jedis.Jedis;

class RedisTest2 {

public static void main(String[] args) {

Jedis jedis = new Jedis("localhost");

String value = jedis.hget("student.scofield", "English");

System.out.println("scofield's English score is: " + value);

}

}

 

 

(四)MongoDB数据库操作

Student文档如下:

{

“name”: “zhangsan”,

“score”: {

“English”: 69,

“Math”: 86,

“Computer”: 77

}

}

{

“name”: “lisi”,

“score”: {

“English”: 55,

“Math”: 100,

“Computer”: 88

}

}

 

1.根据上面给出的文档,完成如下操作:

(1)用MongoDB Shell设计出student集合;

 

(3)用find()方法输出两个学生的信息;

 

(4)用find()方法查询zhangsan的所有成绩(只显示score列);

 

(5)修改lisi的Math成绩,改为95。

 

 

2.根据上面已经设计出的Student集合,用MongoDB的Java客户端编程,实现如下操作:

(1)添加数据:English:45 Math:89  Computer:100

与上述数据对应的文档形式如下:

{

“name”: “scofield”,

“score”: {

“English”: 45,

“Math”: 89,

“Computer”: 100

}

}

public class MongoTest {

public static void main(String[] args) {

MongoClient mongoClient = new MongoClient("localhost", 27017);

MongoDatabase mongoDatabase = mongoClient.getDatabase("student");

MongoCollection<Document> collection = mongoDatabase.getCollection("student");

Document document = new Document("name", "scofield").append("score",new Document("English", 45).append("Math", 89).append("Computer", 100));

List<Document> documents = new ArrayList<Document>();

documents.add(document);

collection.insertMany(documents);

System.out.println("文档插入成功");

}

}

 

(2)获取scofield的所有成绩成绩信息(只显示score列)

public class MongoTest2 {

public static void main(String[] args) {

MongoClient mongoClient=new MongoClient("localhost",27017);

MongoDatabase mongoDatabase = mongoClient.getDatabase("student");

MongoCollection<Document> collection = mongoDatabase.getCollection("student");

MongoCursor<Document> cursor=collection.find( new Document("name","scofield")).

projection(new Document("score",1).append("_id", 0)).iterator();

while(cursor.hasNext())

System.out.println(cursor.next().toJson());

}

}

上一篇:2.2-编写第一个maven工程


下一篇:(1)课程简介-CS231A:Computer Vision, From 3D Reconstruction to Recognition