HBase常用的数据库API操作
HBase常用的数据库API操作Posted on 需要引入Hadoop和Hbase的jar包，我这里HBase用的是hbase-0.90.5版本，所以我这里引入的HBase的jar包是hbase-0.90.5.jar和zookeeper-3.3.2.jar。 一些常用的API操作： package cn.luxh.app.util; import java.io.IOExcepti
HBase常用的数据库API操作 Posted on
需要引入Hadoop和Hbase的jar包，我这里HBase用的是hbase-0.90.5版本，美国空间，所以我这里引入的HBase的jar包是hbase-0.90.5.jar和zookeeper-3.3.2.jar。
一些常用的API操作：
package cn.luxh.app.util; import java.io.IOException; import java.util.Arrays; 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.MasterNotRunningException; import org.apache.hadoop.hbase.ZooKeeperConnectionException; 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.CompareFilter.CompareOp; import org.apache.hadoop.hbase.filter.Filter; import org.apache.hadoop.hbase.filter.FilterList; import org.apache.hadoop.hbase.filter.FilterList.Operator; import org.apache.hadoop.hbase.filter.SingleColumnValueFilter; import org.apache.hadoop.hbase.util.Bytes; public class HBaseUtil { /** * 初始化HBase的配置文件 * Configuration getConfiguration(){ Configuration conf = HBaseConfiguration.create(); //和hbase-site.xml中配置的一致 conf.set("hbase.zooker.quorum", "h1,h2,h2"); return conf; } /** * 实例化HBaseAdmin,HBaseAdmin用于对表的元素据进行操作 * @return * @throws MasterNotRunningException * @throws ZooKeeperConnectionException HBaseAdmin getHBaseAdmin() throws MasterNotRunningException, ZooKeeperConnectionException{ return new HBaseAdmin(getConfiguration()); } /** * 创建表 * @param tableName 表名 * @param columnFamilies 列族 * @throws IOException createTable(String tableName,String...columnFamilies) throws IOException { HTableDescriptor htd = new HTableDescriptor(tableName.getBytes());// for(String fc : columnFamilies) { htd.addFamily(new HColumnDescriptor(fc)); } getHBaseAdmin().createTable(htd); } /** * 获取HTableDescriptor * @param tableName * @return * @throws IOException HTableDescriptor getHTableDescriptor(byte[] tableName) throws IOException{ return getHBaseAdmin().getTableDescriptor(tableName); } /** * 获取表 * @param tableName 表名 * @return * @throws IOException HTable getHTable(String tableName) throws IOException{ return new HTable(getConfiguration(),tableName); } /** * 获取Put,Put是插入一行数据的封装格式 * @param tableName * @param row * @param columnFamily * @param qualifier * @param value * @return * @throws IOException Put getPut(String row,String columnFamily,String qualifier,String value) throws IOException{ Put put = new Put(row.getBytes()); if(qualifier==null||"".equals(qualifier)) { put.add(columnFamily.getBytes(), null, value.getBytes()); }else { put.add(columnFamily.getBytes(), qualifier.getBytes(), value.getBytes()); } return put; } /** * 查询某一行的数据 * @param tableName 表名 * @param row 行键 * @return * @throws IOException Result getResult(String tableName,String row) throws IOException { Get get = new Get(row.getBytes()); HTable htable = getHTable(tableName); Result result = htable.get(get); htable.close(); return result; } /** * 条件查询 * @param tableName 表名 * @param columnFamily 列族 * @param queryCondition 查询条件值 * @param begin 查询的起始行 * @param end 查询的终止行 * @return * @throws IOException ResultScanner getResultScanner(String tableName,String columnFamily,String queryCondition,String begin,String end) throws IOException{ Scan scan = new Scan(); //设置起始行 scan.setStartRow(Bytes.toBytes(begin)); //设置终止行 scan.setStopRow(Bytes.toBytes(end)); //指定要查询的列族 scan.addColumn(Bytes.toBytes(columnFamily),null); //查询列族中值等于queryCondition的记录 Filter filter1 = new SingleColumnValueFilter(Bytes.toBytes(columnFamily),null,CompareOp.EQUAL,Bytes.toBytes(queryCondition)); //Filter filter2 = new SingleColumnValueFilter(Bytes.toBytes(columnFamily),null,CompareOp.EQUAL,Bytes.toBytes("chuliuxiang")); FilterList filterList = new FilterList(Operator.MUST_PASS_ONE,Arrays.asList(filter1)); scan.setFilter(filterList); HTable htable = getHTable(tableName); ResultScanner rs = htable.getScanner(scan); htable.close(); return rs; } }
测试：