java操作hbase的增删改查

小咪咪 2022-05-24 13:39 241阅读 0赞

首先需要将hbase安装目录下lib文件夹中的jar文件全部加入到项目类路径下，另外还需要将hadoop相关jar包也加入。

这里需要用到的主要API介绍一下。

Configuration：HBase参数配置对象。

Connection：HBase连接对象，通过ConnectionFactory工厂方法创建，需要传入一个参数配置对象。

Admin：通过Admin实现创建表，删除表操作。

TableName：取代字符串形式的tableName。

Table：使用Table可以新增数据put()，查询数据getScanner()。

下面通过代码来演示如何做常规的操作：

1、初始化配置，构建一个HBase连接器对象。

private static Connection connection;
    
    static{
    	Configuration config = HBaseConfiguration.create();
    	config.set("hbase.rootdir", "hdfs://server:9000/hbase");
    	config.set("hbase.zookeeper.quorum", "server:2181");
    	try {
    		connection = ConnectionFactory.createConnection(config);
    	} catch (IOException e) {
    		e.printStackTrace();
    	}	
    }

2、建表。

public static boolean createTable(String tableName,String columnFamily){
    	boolean success = false;
    	Admin admin = null;
    	TableName tn = TableName.valueOf(tableName);
    	try {
    		admin = connection.getAdmin();
    		if(!admin.tableExists(tn)){
    			HTableDescriptor desc = new HTableDescriptor(tn);
    			desc.addFamily(new HColumnDescriptor(columnFamily.getBytes()));
    			admin.createTable(desc);
    			System.out.println("table ["+tableName+"] create ok.");
    			success = true;			
    		}else{
    			System.out.println("table ["+tableName+"] already exists.");
    			success = false ;
    		}
    	} catch (Exception e) {
    		success = false ;
    	}
    	return success;
    }

3、插入数据。

public static boolean putData(String tableName,String rowKey,String columnFamily,String qualifier,Object value){
    	boolean success = false;
    	Admin admin = null;
    	TableName table = TableName.valueOf(tableName);
    	try {
    		admin = connection.getAdmin();
    		if(admin.tableExists(table)){
    			Table t = connection.getTable(table);
    			Put put = new Put(rowKey.getBytes());
    			put.addColumn(columnFamily.getBytes(), qualifier.getBytes(), value.toString().getBytes());
    			t.put(put);
    			success = true;
    		}else{
    			System.out.println("table ["+tableName+"] does not exist.");
    			success = false;
    		}
    	} catch (Exception e) {
    		success = false;
    	}
    	return success;
    }

4、查看数据。

@SuppressWarnings("deprecation")
    public static void getValueByTable(String tableName){
    	TableName tn = TableName.valueOf(tableName.getBytes());
    	try{
    		Table table = connection.getTable(tn);
    		ResultScanner rs = table.getScanner(new Scan());
    		for(Result r:rs){
    			System.out.println("row:"+new String(r.getRow()));
    			for(KeyValue kv:r.raw()){
    				System.out.println("column family:"+new String(kv.getFamilyArray())
    				+" qualifier "+new String(kv.getQualifierArray())
    				+" value "+new String(kv.getValueArray()));
    			}
    		}
    	}catch(Exception e){
    		e.printStackTrace();
    	}
    }

5、删除表。

public static boolean dropTable(String tableName){
    	boolean success = false;
    	Admin admin = null;
    	try {
    		admin = connection.getAdmin();
    		TableName table = TableName.valueOf(tableName);
    		if(admin.tableExists(table)){
    			admin.disableTable(table);
    			admin.deleteTable(table);
    			success = true;
    		}
    	} catch (Exception e) {
    		success = false;
    	}finally{
    		IOUtils.closeQuietly(admin);
    	}
    	return success;
    }

6、以上几段代码展示了，如何初始化hbase连接，创建表，添加数据，查看数据，删除表的操作，下面通过运行，查看效果。这里代码在windows的eclipse ide编码的，为了演示，我们通过ant构建插件sshexec来将代码直接提交到hbase服务器上运行。这里给出完整的构建脚本build.xml。

<?xml version="1.0" encoding="UTF-8"?>
    <project basedir="." name="hbase" default="sshexec">
        <property name="main.class" value="com.xxx.hbase.test.HBaseTest"/>
        <property name="src.dir" value="${basedir}/src" />
        <property name="java.lib.dir" value="${basedir}/lib"/>
        <property name="localpath.dir" value="${basedir}"/>
        <property name="dest.dir" value="${basedir}/dest"/>
        <property name="classes.dir" value="${basedir}/classes"/>
        <property name="third.lib.dir" value="${basedir}/lib"/>
        <property name="remote.host" value="10.119.9.149"/>
        <property name="remote.username" value="root"/>
        <property name="remote.password" value="root"/>
        <property name="remote.home" value="~"/>
        
        <path id="compile.classpath">
            <fileset dir="${java.lib.dir}">          
                <include name="tools.jar"/>
            </fileset>
            <fileset dir="${third.lib.dir}">          
                <include name="*.jar"/>
            </fileset>
        </path>
        
        <path id="run.classpath">
            <path refid="compile.classpath"/>
            <pathelement location="${classes.dir}" />
        </path>
        
        <target name="clean">
            <delete dir="${classes.dir}"/>
            <delete dir="${dest.dir}"/>
            <echo level="info">清理完毕</echo>
        </target>
        <target name="init" depends="clean">
            <mkdir dir="${classes.dir}"/>
            <mkdir dir="${dest.dir}"/>
        </target>
        
        <target name="compile" depends="init">
            <javac srcdir="${src.dir}" destdir="${classes.dir}" source="1.8" target="1.8"
            includeAntRuntime="false" debug="false" verbose="false" encoding="UTF-8">
                <classpath refid="compile.classpath"/>
            </javac>   
        </target>
        
        <target name="build" depends="compile">
            <jar jarfile="${dest.dir}/hbasetest.jar">
                <fileset dir="${classes.dir}" includes="**/*.*"/>
            </jar>
        </target>
        
        <target name="ssh" depends="build">
            <scp  file="${dest.dir}/hbasetest.jar" 
             todir="${remote.username}@${remote.host}:${remote.home}" 
             password="${remote.password}" trust="true"/>    
        </target>
        
        <target name="sshexec" depends="ssh">
            <sshexec host="${remote.host}" username="${remote.username}" 
               password="${remote.password}" trust="true" 
               command="hadoop jar ${remote.home}/hbasetest.jar ${main.class}"/>     
        </target>
    </project>

7、先运行创建表的任务。

![20190316092609294.png][]

运行截图：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZlaW5pZmk_size_16_color_FFFFFF_t_70][]

生成表：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZlaW5pZmk_size_16_color_FFFFFF_t_70 1][]

8、再运行添加数据方法：

![20190316093054866.png][]

运行构建成功截图：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZlaW5pZmk_size_16_color_FFFFFF_t_70 2][]

验证数据是否添加：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZlaW5pZmk_size_16_color_FFFFFF_t_70 3][]

9、运行查看数据：

![20190316093822533.png][]

构建结果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZlaW5pZmk_size_16_color_FFFFFF_t_70 4][]

10、删除表，调用删除表api之前，需要先调用禁用表api方法。

![20190316093917232.png][]

构建截图：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZlaW5pZmk_size_16_color_FFFFFF_t_70 5][]

验证是否删除：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZlaW5pZmk_size_16_color_FFFFFF_t_70 6][]

最后，附上完整的java代码部分：

package com.xxx.hbase.test;
    import java.io.IOException;
    import org.apache.commons.io.IOUtils;
    import org.apache.hadoop.conf.Configuration;
    import org.apache.hadoop.hbase.HBaseConfiguration;
    import org.apache.hadoop.hbase.HColumnDescriptor;
    import org.apache.hadoop.hbase.HTableDescriptor;
    import org.apache.hadoop.hbase.KeyValue;
    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.Result;
    import org.apache.hadoop.hbase.client.ResultScanner;
    import org.apache.hadoop.hbase.client.Scan;
    import org.apache.hadoop.hbase.client.Table;
    
    public class HBaseTest {
    	
    	private static Connection connection;
    
    	static{
    		Configuration config = HBaseConfiguration.create();
    		config.set("hbase.rootdir", "hdfs://server:9000/hbase");
    		config.set("hbase.zookeeper.quorum", "server:2181");
    		try {
    			connection = ConnectionFactory.createConnection(config);
    		} catch (IOException e) {
    			e.printStackTrace();
    		}	
    	}
    	
    	public static boolean createTable(String tableName,String columnFamily){
    		boolean success = false;
    		Admin admin = null;
    		TableName tn = TableName.valueOf(tableName);
    		try {
    			admin = connection.getAdmin();
    			if(!admin.tableExists(tn)){
    				HTableDescriptor desc = new HTableDescriptor(tn);
    				desc.addFamily(new HColumnDescriptor(columnFamily.getBytes()));
    				admin.createTable(desc);
    				System.out.println("table ["+tableName+"] create ok.");
    				success = true;			
    			}else{
    				System.out.println("table ["+tableName+"] already exists.");
    				success = false ;
    			}
    		} catch (Exception e) {
    			success = false ;
    		}
    		return success;
    	}
    	
    	public static boolean dropTable(String tableName){
    		boolean success = false;
    		Admin admin = null;
    		try {
    			admin = connection.getAdmin();
    			TableName table = TableName.valueOf(tableName);
    			if(admin.tableExists(table)){
    				admin.disableTable(table);
    				admin.deleteTable(table);
    				success = true;
    			}
    		} catch (Exception e) {
    			success = false;
    		}finally{
    			IOUtils.closeQuietly(admin);
    		}
    		return success;
    	}
    	
    	public static boolean putData(String tableName,String rowKey,
            String columnFamily,String qualifier,Object value){
    		boolean success = false;
    		Admin admin = null;
    		TableName table = TableName.valueOf(tableName);
    		try {
    			admin = connection.getAdmin();
    			if(admin.tableExists(table)){
    				Table t = connection.getTable(table);
    				Put put = new Put(rowKey.getBytes());
    				put.addColumn(columnFamily.getBytes(), 
                     qualifier.getBytes(), value.toString().getBytes());
    				t.put(put);
    				success = true;
    			}else{
    				System.out.println("table ["+tableName+"] does not exist.");
    				success = false;
    			}
    		} catch (Exception e) {
    			success = false;
    		}
    		return success;
    	}
    	
    	@SuppressWarnings("deprecation")
    	public static void getValueByTable(String tableName){
    		TableName tn = TableName.valueOf(tableName.getBytes());
    		try{
    			Table table = connection.getTable(tn);
    			ResultScanner rs = table.getScanner(new Scan());
    			for(Result r:rs){
    				System.out.println("row:"+new String(r.getRow()));
    				for(KeyValue kv:r.raw()){
    					System.out.println("column family:"
                        +new String(kv.getFamilyArray())
    					+" qualifier "+new String(kv.getQualifierArray())
    					+" value "+new String(kv.getValueArray()));
    				}
    			}
    		}catch(Exception e){
    			e.printStackTrace();
    		}
    	}
    	
    	public static void main(String[] args) throws Exception{
    		//createTable("stu", "info");
    		//putData("stu", "1", "info", "id",1);
    		//putData("stu", "1", "info", "name","xxx");
    		//getValueByTable("stu");
    		dropTable("stu");
    	}
    	
    }

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