Hbase操作与编程使用

时间:2020-11-21
本文章向大家介绍Hbase操作与编程使用,主要包括Hbase操作与编程使用使用实例、应用技巧、基本知识点总结和需要注意事项,具有一定的参考价值,需要的朋友可以参考一下。

(1)createTable(String tableName, String[] fields)创建表。

import org.apache.hadoop.conf.Configuration;

import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.ColumnFamilyDescriptor;
import org.apache.hadoop.hbase.client.ColumnFamilyDescriptorBuilder;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.Admin;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.client.TableDescriptorBuilder;
import org.apache.hadoop.hbase.util.Bytes;
import java.io.IOException;
 
public class CreateTable {
    public static Configuration configuration;
    public static Connection connection;
    public static Admin admin;
     
    public static void init(){//建立连接
        configuration = HBaseConfiguration.create();
        configuration.set("hbase.rootdir","hdfs://localhost:9000/hbase");
        try{
            connection = ConnectionFactory.createConnection(configuration);
            admin = connection.getAdmin();
        }catch(IOException e){
            e.printStackTrace();
        }
    }
    public static void close(){//关闭连接
        try{
            if(admin != null){
                admin.close();
            }
            if(connection != null){
                connection.close();
            }
        }catch(IOException e){
            e.printStackTrace();
        }
    }
    public static void createTable(String tableName,String[] fields) throws IOException{
        init();
        TableName tablename = TableName.valueOf(tableName);//定义表名
        if(admin.tableExists(tablename)){
            System.out.println("table is exists!");
            admin.disableTable(tablename);
            admin.deleteTable(tablename);
        }
        TableDescriptorBuilder tableDescriptor = TableDescriptorBuilder.newBuilder(tablename);
        for(int i=0;i<fields.length;i++){
            ColumnFamilyDescriptor family = ColumnFamilyDescriptorBuilder.newBuilder(Bytes.toBytes(fields[i])).build();
            tableDescriptor.setColumnFamily(family);
        }
        admin.createTable(tableDescriptor.build());
        close();
    }
    public static void main(String[] args){
        String[] fields = {"id","score"};
        try{
            createTable("test",fields);
        }catch(IOException e){
            e.printStackTrace();
        }
    }
}
(2)addRecord(String tableName, String row, String[] fields, String[] values)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
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 addRecord {
    public static Configuration configuration;
    public static Connection connection;
    public static Admin admin;
     
    public static void init(){//建立连接
        configuration = HBaseConfiguration.create();
        configuration.set("hbase.rootdir","hdfs://localhost:9000/hbase");
        try{
            connection = ConnectionFactory.createConnection(configuration);
            admin = connection.getAdmin();
        }catch(IOException e){
            e.printStackTrace();
        }
    }
    public static void close(){//关闭连接
        try{
            if(admin != null){
                admin.close();
            }
            if(connection != null){
                connection.close();
            }
        }catch(IOException e){
            e.printStackTrace();
        }
    }
    public static void addRecord(String tableName,String row,String[] fields,String[] values) throws IOException{
        init();//连接Hbase
        Table table = connection.getTable(TableName.valueOf(tableName));//表连接
        Put put = new Put(row.getBytes());//创建put对象
        for(int i=0;i<fields.length;i++){
            String[] cols = fields[i].split(":");
            if(cols.length == 1){
                put.addColumn(fields[i].getBytes(),"".getBytes(),values[i].getBytes());
            }
            else{
                put.addColumn(cols[0].getBytes(),cols[1].getBytes(),values[i].getBytes());
            }
            table.put(put);//向表中添加数据
        }
        close();//关闭连接
    }
    public static void main(String[] args){
        String[] fields = {"Score:Math","Score:Computer Science","Score:English"};
        String[] values = {"90","90","90"};
        try{
            addRecord("grade","S_Name",fields,values);
        }catch(IOException e){
            e.printStackTrace();
        }
    }
}
 
 

(3)scanColumn(String tableName, String column)

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
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.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.util.Bytes;
 
 
public class scanColumn {
    public static Configuration configuration;
    public static Connection connection;
    public static Admin admin;
     
    public static void init(){//建立连接
        configuration = HBaseConfiguration.create();
        configuration.set("hbase.rootdir","hdfs://localhost:9000/hbase");
        try{
            connection = ConnectionFactory.createConnection(configuration);
            admin = connection.getAdmin();
        }catch(IOException e){
            e.printStackTrace();
        }
    }
    public static void close(){//关闭连接
        try{
            if(admin != null){
                admin.close();
            }
            if(connection != null){
                connection.close();
            }
        }catch(IOException e){
            e.printStackTrace();
        }
    }
    public static void showResult(Result result){
        Cell[] cells = result.rawCells();
        for(int i=0;i<cells.length;i++){
            System.out.println("RowName:"+new String(CellUtil.cloneRow(cells[i])));//打印行键
            System.out.println("ColumnName:"+new String(CellUtil.cloneQualifier(cells[i])));//打印列名
            System.out.println("Value:"+new String(CellUtil.cloneValue(cells[i])));//打印值
            System.out.println("Column Family:"+new String(CellUtil.cloneFamily(cells[i])));//打印列簇
            System.out.println();
        }
    }
    public static void scanColumn(String tableName,String column){
        init();
        try {
            Table table = connection.getTable(TableName.valueOf(tableName));
            Scan scan  = new Scan();
            scan.addFamily(Bytes.toBytes(column));
            ResultScanner scanner = table.getScanner(scan);
            for(Result result = scanner.next();result != null;result = scanner.next()){
                showResult(result);
            }
        catch (IOException e) {
            e.printStackTrace();
        }
        finally{
            close();
        }
    }
    public static void main(String[] args){
        scanColumn("Student","S_Age");
    }
}

(4)modifyData(String tableName, String row, String column)

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
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 modifyData {
    public static Configuration configuration;
    public static Connection connection;
    public static Admin admin;
    public static void init(){//建立连接
        configuration = HBaseConfiguration.create();
        configuration.set("hbase.rootdir","hdfs://localhost:9000/hbase");
        try{
            connection = ConnectionFactory.createConnection(configuration);
            admin = connection.getAdmin();
        }catch(IOException e){
            e.printStackTrace();
        }
    }
    public static void close(){//关闭连接
        try{
            if(admin != null){
                admin.close();
            }
            if(connection != null){
                connection.close();
            }
        }catch(IOException e){
            e.printStackTrace();
        }
    }
    public static void modifyData(String tableName,String row,String column,String value) throws IOException{
        init();
        Table table = connection.getTable(TableName.valueOf(tableName));
        Put put = new Put(row.getBytes());
        String[] cols = column.split(":");
        if(cols.length == 1){
            put.addColumn(column.getBytes(),"".getBytes(), value.getBytes());
        }
        else{
            put.addColumn(cols[0].getBytes(), cols[1].getBytes(), value.getBytes());
        }
        table.put(put);
        close();
    }
    public static void main(String[] args){
        try{
            modifyData("Student","1","S_Name","Tom");
        }
        catch(Exception e){
            e.printStackTrace();
        }
    }
}
 

(5)deleteRow(String tableName, String row)

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
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.Delete;
import org.apache.hadoop.hbase.client.Table;
 
 
public class deleteRow {
    public static Configuration configuration;
    public static Connection connection;
    public static Admin admin;
    public static void init(){//建立连接
        configuration = HBaseConfiguration.create();
        configuration.set("hbase.rootdir","hdfs://localhost:9000/hbase");
        try{
            connection = ConnectionFactory.createConnection(configuration);
            admin = connection.getAdmin();
        }catch(IOException e){
            e.printStackTrace();
        }
    }
    public static void close(){//关闭连接
        try{
            if(admin != null){
                admin.close();
            }
            if(connection != null){
                connection.close();
            }
        }catch(IOException e){
            e.printStackTrace();
        }
    }
    public static void deleteRow(String tableName,String row) throws IOException{
        init();
        Table table = connection.getTable(TableName.valueOf(tableName));
        Delete delete = new Delete(row.getBytes());
        table.delete(delete);
        close();
    }
    public static void main(String[] args){
        try{
            deleteRow("Student","3");
        }catch(Exception e){
            e.printStackTrace();
        }
    }
}