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 value = jedis.hgetAll("student.scofield");
for (Map.Entry 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 collection = mongoDatabase.getCollection("student");
Document document = new Document("name", "scofield").append("score",new Document("English", 45).append("Math", 89).append("Computer", 100));
List documents = new ArrayList();
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 collection = mongoDatabase.getCollection("student");
MongoCursor 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());
}
}
本文介绍了在Linux环境下,通过Java编程对比操作MySQL、HBase、Redis和MongoDB数据库的过程。涵盖了创建表、插入数据、查询和修改数据等基本操作,展示了四大数据库的不同特性和使用方式。
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