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关注用户(二) | 学习笔记

开发者学堂课程【分布式数据库 HBase 快速入门:关注用户(二)】学习笔记,与课程紧密联系,让用户快速学习知识。

课程地址:

https://developer.aliyun.com/learning/course/101/detail/1774

关注用户(二)

内容介绍

一、关注用户(二)

关注用户:

package com. atguigu.weibo;

public class WeiBoUtil {

private static Configuration configuration = HBaseConfiguration.create() ;

static {

configuration.set("hbase.zookeeper. quorum",, "192.168.9.102");

}

//创建命名空间

public static void createNamespace(String ns){

//创建连接

ConnectionFactory.createConnection(configuration) ;

Admin admin = connection.getAdmin() ;

//创建NS描述器

NamespaceDescriptor namespaceDescriptor = NamespaceDescriptor.create(ns)

build();

//创建操作

admin.createNamespace (namespaceDescriptor);

//关闭资源admin.close() ;

connection.close() ;

}

//创建表

public static void createTable(String tableName, String... cfs){

//创建连接

Connection connection = ConnectionFactory.createConnection(configuration);

Admin admin = connection.getAdmin() ;

HTableDescriptor hTableDescriptor = new HTableDescriptor(TableName. valueOf(tableName));

//循环添加列族

for (String cf : cfs){

HColumnDescriptor hColumnDescriptor = new HColumnDescriptor(cf) ;

hColumnDescriptor.setMaxVersions(versions);

hTableDescriptor.addFamily (hColumnDescriptor);

admin.createTable(hTableDescriptor);

//关闭资源

admin.close() ;

connection.close() :

}

/**

*1.更新微博内容表数据

*2.更新收件箱表数据

*     --获取当前操作人的fans

*     --去往收件箱表依次更新数据

*@param uid

* @paramcontent

*@throws IOException

*/

//发布微博

public static void createData(String uid,String content){

Connection connection = ConnectionFactory.createConnection(configuration);

Table contTable = connection.getTable(TableName. value0f(Constant.CONTENT));

Table relaTable = connection.getTable(TableName. valueOf(Constant.RELATIONS)) ;

Table inboxTable = connection.getTable(TableName. valueOf(Constant.INBOX));

//拼接RK

long ts = System. currentTimeMillis() ;

String rowKey = uid + "_" + ts;

//生产put对象

Put put = new Put(Bytes.toBytes(rowKey)) ;

put. addColumn(Bytes.toBytes( s:"info"),Bytes.toBytes( s:"content"),Bytes.toBytes(content)) ;

//往内容表添加数据

contTable.put(put);

//获取关系表中的fans

Get get = new Get(Bytes.toBytes(uid)) ;

get.addFamily(Bytes.toBytes( s: "fans") ) ;

Result result = relaTable.get(get);

Ce11[] cells = result.rawCells() ;

if (cells.length <= 0){

return;

}

//更新fans收件箱表

List puts = new ArrayList<>();

for (Cell cell : cells) {

byte[] cloneQualifier = Cellutil.cloneQualifier(cell);

Put inboxPut = new Put(cloneQualifier);

inboxPut.addColumn(Bytes.toBytes(s:"info"),Bytes.toBytes(uid) ,Bytes.toBytes())

puts.add(inboxPut) ;

//关闭资源admin.close() ;

connection.close() ;

}

/**

*1.在用户关系表

*—-添加操作人的attends

*--添加被操作人的fans

* 2.在收件箱中

*--在微博内容中获取被关注者的3条数据(rowkey)

*--在收件箱表中添加操作人的关注者信息

*@param uid

*@param uids

*/

//关注用户

public static void addAttend(String uid,String.. . uids) throws IOException {

//获取连接

Connection connection = ConnectionFactory.createConnection(configuration);

//获取三张操作的表对象

Table contTable = connection.getTable(TableName.valueOf(Constant.CONTENT));

Table relaTable = connection.getTable(TableName. value0f(Constant.RELATIONS) ;

Table inboxTable = connection.getTable(TableName.value0f(Constant.INBOX) );

Put relaPut = new Put (Bytes.toBytes(uid)) ;

ArrayList puts = new ArrayList<>() ;

for (String s : uids) {

relaPut.addColumn(Bytes.toBytes(s:"attends"),Bytes.toBytes(s),Bytes.toBytes(s))  

//创建被关注者的put对象

put fansPut = new Put(Bytes.toBytes(s)) ;

fansPut. addColumn(Bytes.toBytes( s:"fans"),Bytes.toBytes(uid)Bytes.toBytes(uid);

puts.add(fansPut) ;

}

puts.add(relaPut) ;

relaTable.put(puts):

Put inboxPut = new Put(Bytes.toBytes(uid)) ;

//获取内容表中被关注者的rowkey

for (String s : uids){

Scan scan = new Scan(Bytes.toBytes(s),Bytes.toBytes( s:s +"|"));

ResultScanner results = contTable.getScanner(scan);

for (Result result : results){

byte[] row = result.getRow () ;

inboxPut.addColumn(Bytes.toBytes( s: "info"),Bytes.toBytes(s),row) ;

}

}

inboxTable.put(inboxPut) ;

inboxTable.close() ;

relaTable.close() ;

contTable.close() ;

connection.close() ;

}

//取关用户

//获取微博内容(初始化页面)

//获取微博内容(查看某个人所有微博内容)

}

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