NoSQL 和关系数据库的操作比较

(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. MySQL 中创建 Student 表,并录入数据;

    创建数据库

  2. SQL 语句输出 Student 表中的所有记录;

  3. 查询 zhangsan Computer 成绩;

4)修改 lisi Math 成绩,改为 95

根据上面已经设计出的 Student 表,使用 MySQL 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 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. Hbase Shell 命令创建学生表 Student

  2. scan 命令浏览 Student 表的相关信息;

  1. 查询 zhangsan Computer 成绩;

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

2)用 hgetall 命令分别输出 zhangsan lisi 的成绩信息;

  1. hget 命令查询 zhangsan Computer 成绩;

  1. 修改 lisi Math 成绩,改为 95

2.根据上面已经设计出的学生表 Student,用 Redis 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 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;

2)用 find()方法输出两个学生的信息;

  1. find()方法查询 zhangsan 的所有成绩(只显示 score )

  2. 修改 lisi Math 成绩,改为 95

2.根据上面已经设计出的 Student 集合,用 MongoDB 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 )

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());

}

}

原文地址:https://www.cnblogs.com/aishanyishi/p/10304703.html