HBase在java代码中的使用

来源：互联网发布：惠普游戏本知乎编辑：程序博客网时间：2024/05/16 12:56

public class HbaseDao {

@Test//创建表

public void createTable throws Exception {

Configuration conf = HBaseConfiguration.create();
conf.set("hbase.zookeeper.quorum", "weekend05:2181,weekend06:2181,weekend07:2181");

HBaseAdmin admin = new HBaseAdmin(conf);

TableName name = TableName.valueOf("nvshen");

HTableDescriptor desc = new HTableDescriptor(name);

HColumnDescriptor base_info = new HColumnDescriptor("base_info");
HColumnDescriptor extra_info = new HColumnDescriptor("extra_info");
base_info.setMaxVersions(5);

desc.addFamily(base_info);
desc.addFamily(extra_info);

admin.createTable(desc);

}

@Test//插入数据
public void insertTest() throws Exception{

Configuration conf = HBaseConfiguration.create();
conf.set("hbase.zookeeper.quorum", "weekend05:2181,weekend06:2181,weekend07:2181");

HTable nvshen = new HTable(conf, "nvshen");//获取表

Put name = new Put(Bytes.toBytes("rk0001"));//创建一行

name.add(Bytes.toBytes("base_info"), Bytes.toBytes("name"), Bytes.toBytes("angelababy"));

//在这行中放入数据

Put age = new Put(Bytes.toBytes("rk0001"));//获取一行
age.add(Bytes.toBytes("base_info"), Bytes.toBytes("age"), Bytes.toBytes(18));

ArrayList<Put> puts = new ArrayList<>();
puts.add(name);
puts.add(age);

nvshen.put(puts);

}

//从上面可以知道要插入数据先获取表，再获取行（创建行）在插入数据

}

public class HbaseDemo {

private Configuration conf = null;

@Before
public void init(){
conf = HBaseConfiguration.create();
conf.set("hbase.zookeeper.quorum", "weekend05,weekend06,weekend07");
}

@Test
public void testDrop() throws Exception{
HBaseAdmin admin = new HBaseAdmin(conf);
admin.disableTable("account");
admin.deleteTable("account");
admin.close();
}

@Test
public void testPut() throws Exception{
HTable table = new HTable(conf, "person_info");
Put p = new Put(Bytes.toBytes("person_rk_bj_zhang_000002"));
p.add("base_info".getBytes(), "name".getBytes(), "zhangwuji".getBytes());
table.put(p);
table.close();
}

@Test
public void testGet() throws Exception{
HTable table = new HTable(conf, "person_info");
Get get = new Get(Bytes.toBytes("person_rk_bj_zhang_000001"));
get.setMaxVersions(5);
Result result = table.get(get);
List<Cell> cells = result.listCells();

// result.getValue(family, qualifier); 可以从result中直接取出一个特定的value

//遍历出result中所有的键值对
for(KeyValue kv : result.list()){
String family = new String(kv.getFamily());
System.out.println(family);
String qualifier = new String(kv.getQualifier());
System.out.println(qualifier);
System.out.println(new String(kv.getValue()));

}
table.close();
}

/**
* 多种过滤条件的使用方法
* @throws Exception
*/
@Test
public void testScan() throws Exception{
HTable table = new HTable(conf, "person_info".getBytes());
Scan scan = new Scan(Bytes.toBytes("person_rk_bj_zhang_000001"), Bytes.toBytes("person_rk_bj_zhang_000002"));

//前缀过滤器----针对行键
Filter filter = new PrefixFilter(Bytes.toBytes("rk"));

//行过滤器
ByteArrayComparable rowComparator = new BinaryComparator(Bytes.toBytes("person_rk_bj_zhang_000001"));
RowFilter rf = new RowFilter(CompareOp.LESS_OR_EQUAL, rowComparator);

/**
* 假设rowkey格式为：创建日期_发布日期_ID_TITLE
* 目标：查找发布日期为 2014-12-21 的数据
*/
rf = new RowFilter(CompareOp.EQUAL , new SubstringComparator("_2014-12-21_"));

//单值过滤器 1 完整匹配字节数组
new SingleColumnValueFilter("base_info".getBytes(), "name".getBytes(), CompareOp.EQUAL, "zhangsan".getBytes());
//单值过滤器2 匹配正则表达式
ByteArrayComparable comparator = new RegexStringComparator("zhang.");
new SingleColumnValueFilter("info".getBytes(), "NAME".getBytes(), CompareOp.EQUAL, comparator);

//单值过滤器2 匹配是否包含子串,大小写不敏感
comparator = new SubstringComparator("wu");
new SingleColumnValueFilter("info".getBytes(), "NAME".getBytes(), CompareOp.EQUAL, comparator);

//键值对元数据过滤-----family过滤----字节数组完整匹配
FamilyFilter ff = new FamilyFilter(
CompareOp.EQUAL ,
new BinaryComparator(Bytes.toBytes("base_info")) //表中不存在inf列族，过滤结果为空
);
//键值对元数据过滤-----family过滤----字节数组前缀匹配
ff = new FamilyFilter(
CompareOp.EQUAL ,
new BinaryPrefixComparator(Bytes.toBytes("inf")) //表中存在以inf打头的列族info，过滤结果为该列族所有行
);


//键值对元数据过滤-----qualifier过滤----字节数组完整匹配

filter = new QualifierFilter(
CompareOp.EQUAL ,
new BinaryComparator(Bytes.toBytes("na")) //表中不存在na列，过滤结果为空
);
filter = new QualifierFilter(
CompareOp.EQUAL ,
new BinaryPrefixComparator(Bytes.toBytes("na")) //表中存在以na打头的列name，过滤结果为所有行的该列数据
);

//基于列名(即Qualifier)前缀过滤数据的ColumnPrefixFilter
filter = new ColumnPrefixFilter("na".getBytes());

//基于列名(即Qualifier)多个前缀过滤数据的MultipleColumnPrefixFilter
byte[][] prefixes = new byte[][] {Bytes.toBytes("na"), Bytes.toBytes("me")};
filter = new MultipleColumnPrefixFilter(prefixes);

//为查询设置过滤条件
scan.setFilter(filter);


scan.addFamily(Bytes.toBytes("base_info"));
ResultScanner scanner = table.getScanner(scan);
for(Result r : scanner){
/**
for(KeyValue kv : r.list()){
String family = new String(kv.getFamily());
System.out.println(family);
String qualifier = new String(kv.getQualifier());
System.out.println(qualifier);
System.out.println(new String(kv.getValue()));
}
*/
//直接从result中取到某个特定的value
byte[] value = r.getValue(Bytes.toBytes("base_info"), Bytes.toBytes("name"));
System.out.println(new String(value));
}
table.close();
}

@Test
public void testDel() throws Exception{
HTable table = new HTable(conf, "user");
Delete del = new Delete(Bytes.toBytes("rk0001"));
del.deleteColumn(Bytes.toBytes("data"), Bytes.toBytes("pic"));
table.delete(del);
table.close();
}

public static void main(String[] args) throws Exception {
Configuration conf = HBaseConfiguration.create();
// conf.set("hbase.zookeeper.quorum", "weekend05:2181,weekend06:2181,weekend07:2181");
HBaseAdmin admin = new HBaseAdmin(conf);

TableName tableName = TableName.valueOf("person_info");
HTableDescriptor td = new HTableDescriptor(tableName);
HColumnDescriptor cd = new HColumnDescriptor("base_info");
cd.setMaxVersions(10);
td.addFamily(cd);
admin.createTable(td);

admin.close();

}

}

0 0