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Student学生表
1. 根据上面给出的表格,用Hbase Shell模式设计student学生表格。
a) 设计完后,用scan指令浏览表的相关信息,给出截图。
b) 查询zhangsan 的Computer成绩,给出截图。
c) 修改lisi的Math成绩,改为95,给出截图。
2. 根据上面已经设计出的student,用Hbase API编程。
a) 添加数据:English:45 Math:89 Computer:100
b) 获取scofield的English成绩信息
设计表代码:(复制粘贴代码时,要删除注释部分,下同)
$ ssh localhost //检测自己的ssh服务器设置
$ cd /usr/local/hadoop
$ ./sbin/start-dfs.sh //启动Hadoop
$ jps 注:用以查看hadoop是否启动成功
$ cd /usr/local/hbase
$ bin/start-hbase.sh //启动hbase
$ jps 注:用以查看hbase是否启动成功
$ bin/hbase shell //打开hbase的shell操作
hbase(main):006:0> create 'student','score' //创建student,其包含一个列族score
hbase(main):007:0> put 'student','zhangsan','score:English','69' //添加行健,列限定符和写入单元格数据
hbase(main):008:0> put 'student','zhangsan','score:Math','86'
hbase(main):009:0> put 'student','zhangsan','score:Computer','77'
hbase(main):010:0> put 'student','lisi','score:English','55'
hbase(main):011:0> put 'student','lisi','score:Math','100'
hbase(main):012:0> put 'student','lisi','score:Computer','88'
对应的Linux终端运行截图:
a) 设计完后,用scan指令浏览表的相关信息,给出截图。
hbase(main):013:0> scan 'student' //查看student表中信息
对应的Linux终端运行截图:
b) 查询zhangsan 的Computer成绩,给出截图。
hbase(main):014:0> get 'student','zhangsan','score:Computer'//查询zhangsan 的Computer成绩
对应的Linux终端运行截图:
c) 修改lisi的Math成绩,改为95,给出截图。
hbase(main):015:0> put 'student','lisi','score:Math','95' //修改lisi的Math成绩,改为95
hbase(main):016:0> get 'student','lisi','score:Math'
对应的Linux终端运行截图:
(1)与使用MySQL的JAVA客户端相类似,建立Java Project,但请注意,建立project时,所使用的执行环境JRE为J2SE-1.5,如下图方框所示
(2)在工程中导入外部jar包:这里只需要导入hbase安装目录中的lib文件中的所有jar包如果没有jar包,可下载:https://download.csdn.net/download/weixin_43042683/12439546)。如下图所示:
a) 添加数据:English:45 Math:89 Computer:100
(1)新建class,并将如下代码复制到.java文件中,调试运行,给出结果截图。
- import java.io.IOException;
- import org.apache.hadoop.conf.Configuration;
- import org.apache.hadoop.hbase.HBaseConfiguration;
- import org.apache.hadoop.hbase.TableName;
- import org.apache.hadoop.hbase.client.Admin;
- import org.apache.hadoop.hbase.client.Connection;
- import org.apache.hadoop.hbase.client.ConnectionFactory;
- import org.apache.hadoop.hbase.client.Put;
- import org.apache.hadoop.hbase.client.Table;
-
-
- public class hbase_insert {
-
- /**
- * @param args
- */
- //三个静态成员对象
- public static Configuration configuration;//管理HBase的配置信息
- public static Connection connection;//管理HBase的连接
- public static Admin admin; //管理HBase数据库的表信息
- public static void main(String[] args) {
- // TODO Auto-generated method stub
- configuration = HBaseConfiguration.create();//使用默认的HBase配置文件创建configuration configuration.set("hbase.rootdir","hdfs://localhost:9000/hbase");//连接hbase
- try{
- connection = ConnectionFactory.createConnection(configuration);
- admin = connection.getAdmin();
- }catch (IOException e){
- e.printStackTrace();
- }
- try {//插入的信息
- insertRow("student","scofield","score","English","45");
- insertRow("student","scofield","score","Math","89");
- insertRow("student","scofield","score","Computer","100");
- } catch (IOException e) {//异常处理
- // TODO Auto-generated catch block
- 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();
- }
- //关闭连接
- public static void close(){
- try{
- if(admin != null){
- admin.close();
- }
- if(null != connection){
- connection.close();
- }
- }catch (IOException e){
- e.printStackTrace();
- }
- }
- }
Java运行结果:
hbase检验结果:使用scan ‘student’查看数据是否被添加成功
b) 获取scofield的English成绩信息
(1)获取scofield的English成绩信息,可以采用如下代码,调试运行,给出截图
- import java.io.IOException;
- import org.apache.hadoop.conf.Configuration;
- import org.apache.hadoop.hbase.Cell;
- import org.apache.hadoop.hbase.CellUtil;
- import org.apache.hadoop.hbase.HBaseConfiguration;
- import org.apache.hadoop.hbase.TableName;
- import org.apache.hadoop.hbase.client.Admin;
- import org.apache.hadoop.hbase.client.Connection;
- import org.apache.hadoop.hbase.client.ConnectionFactory;
- import org.apache.hadoop.hbase.client.Get;
- import org.apache.hadoop.hbase.client.Put;
- import org.apache.hadoop.hbase.client.Result;
- import org.apache.hadoop.hbase.client.Table;
-
- public class hbase_query {
-
- /**
- * @param args
- */
- //三个静态成员对象
- public static Configuration configuration;//管理HBase的配置信息
- public static Connection connection;//管理HBase的连接
- public static Admin admin; //管理HBase数据库的表信息
- public static void main(String[] args) {
- // TODO Auto-generated method stub
- configuration = HBaseConfiguration.create();//使用默认的HBase配置文件创建configuration
- configuration.set("hbase.rootdir","hdfs://localhost:9000/hbase");//连接hbase
- try{
- connection = ConnectionFactory.createConnection(configuration);//连接hbase
- admin = connection.getAdmin();
- }catch (IOException e){
- e.printStackTrace();
- }
- try {
- getData("student","scofield","score","English");//获取scofield的English成绩信息
- } catch (IOException e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- }
- close();
- }
- public static void getData(String tableName,String rowKey,String colFamily,
- String col)throws IOException{
- Table table = connection.getTable(TableName.valueOf(tableName));
- Get get = new Get(rowKey.getBytes());
- get.addColumn(colFamily.getBytes(),col.getBytes());
- Result result = table.get(get);//从指定的行的某些单元格中取出相应的值
- showCell(result);
- table.close();
- }
- public static void showCell(Result result){//显示结果信息函数
- Cell[] cells = result.rawCells();
- for(Cell cell:cells){
- System.out.println("RowName:"+new String(CellUtil.cloneRow(cell))+" ");
- System.out.println("Timetamp:"+cell.getTimestamp()+" ");
- System.out.println("column Family:"+new String(CellUtil.cloneFamily(cell))+" ");
- System.out.println("row Name:"+new String(CellUtil.cloneQualifier(cell))+" ");
- System.out.println("value:"+new String(CellUtil.cloneValue(cell))+" ");
- }
- }
- //关闭连接
- public static void close(){
- try{
- if(admin != null){
- admin.close();
- }
- if(null != connection){
- connection.close(); }
- }catch (IOException e){
- e.printStackTrace();
- }
- }
- }
Java 运行结果:
PS:最后,别忘了停止hbase
hbase(main):018:0> hbase(main):025:0> exit
$ bin/stop-hbase.sh
linux终端运行截图:
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