hbase的java操作
2017-02-05 17:04
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操作hbase的分为两种,一种ddl dml,一种是获得HBaseAdmin(见表删表),一种是获得HTable(增删改查)
代码:
代码:
import java.io.IOException; import java.util.ArrayList; 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.TableName; import org.apache.hadoop.hbase.client.HBaseAdmin; import org.apache.hadoop.hbase.client.HTable; import org.apache.hadoop.hbase.client.Put; import org.apache.hadoop.hbase.util.Bytes; import org.junit.Test; public class HbaseDao { @Test 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"); Put name = new Put(Bytes.toBytes("rk0001")); name.add(Bytes.toBytes("base_info"), Bytes.toBytes("name"), Bytes.toBytes("angelababy")); Put age = new Put(Bytes.toBytes("rk0001")); 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); } 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 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); } }
import java.util.List; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.Cell; 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.Delete; import org.apache.hadoop.hbase.client.Get; import org.apache.hadoop.hbase.client.HBaseAdmin; import org.apache.hadoop.hbase.client.HTable; 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.filter.BinaryComparator; import org.apache.hadoop.hbase.filter.BinaryPrefixComparator; import org.apache.hadoop.hbase.filter.ByteArrayComparable; import org.apache.hadoop.hbase.filter.ColumnPrefixFilter; import org.apache.hadoop.hbase.filter.CompareFilter.CompareOp; import org.apache.hadoop.hbase.filter.FamilyFilter; import org.apache.hadoop.hbase.filter.Filter; import org.apache.hadoop.hbase.filter.MultipleColumnPrefixFilter; import org.apache.hadoop.hbase.filter.PrefixFilter; import org.apache.hadoop.hbase.filter.QualifierFilter; import org.apache.hadoop.hbase.filter.RegexStringComparator; import org.apache.hadoop.hbase.filter.RowFilter; import org.apache.hadoop.hbase.filter.SingleColumnValueFilter; import org.apache.hadoop.hbase.filter.SubstringComparator; import org.apache.hadoop.hbase.master.TableNamespaceManager; import org.apache.hadoop.hbase.util.Bytes; import org.junit.Before; import org.junit.Test; 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(); } }