hadoop学习（二）----Hbase二---hbasetemplate的使用

短命女 2022-05-21 20:11 248阅读 0赞

hbasetemplate的execute， get， find 方法的使用

package com.changhong.industry.bd.cloudlogservice.service;
    
    import org.apache.hadoop.hbase.Cell;
    import org.apache.hadoop.hbase.CellUtil;
    import org.apache.hadoop.hbase.client.Put;
    import org.apache.hadoop.hbase.client.Result;
    import org.apache.hadoop.hbase.client.Scan;
    import org.apache.hadoop.hbase.util.Bytes;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.data.hadoop.hbase.HbaseTemplate;
    import org.springframework.data.hadoop.hbase.RowMapper;
    import org.springframework.stereotype.Service;
    
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    /**
     * @author QiYao
     * @date 2018/4/16
     * 查询测试日志服务
     */
    @Service
    public class QueryTestLogService { 
    
        private static final String TABLE_NAME = "ailinktestdatalog";
        @Autowired
        HbaseTemplate hbaseTemplate;
    
        public  List<Map<String,Map<String, String>>> query(String id){
            List<Map<String,Map<String, String>>> md = hbaseTemplate.find(TABLE_NAME, id, (result, rowNum)->{ Cell[] cells = result.rawCells(); Map<String,Map<String, String>> data = new HashMap<>(16); for(Cell c : cells){ String columnFamily = new String(CellUtil.cloneFamily(c)); String rowName = new String(CellUtil.cloneQualifier(c)); String value = new String(CellUtil.cloneValue(c)); Map<String, String> obj = data.get(columnFamily); if(null == obj){ obj = new HashMap<>(16); } obj.put(rowName, value); } return data; }); return md; } /** *数据插入 *@author : zhangai *@date : 11:42 2018/6/22 *@description： * @param tableName 表名 */ public Boolean execute(String tableName) { return hbaseTemplate.execute(tableName,(hTableInterface)->{ boolean flag = false; try{ Put put = new Put("123".getBytes()); hTableInterface.put(put); flag = true; }catch(Exception e){ e.printStackTrace(); } return flag; }); } /** *通过表名和key获取一行数据 *@author : zhangai *@date : 14:21 2018/6/22 *@description： * @param tableName * @param rowName */ public Map<String, Object> get(String tableName, String rowName) { return hbaseTemplate.get(tableName, rowName,new RowMapper<Map<String,Object>>(){ @Override public Map<String, Object> mapRow(Result result, int i) throws Exception { List<Cell> ceList = result.listCells(); Map<String,Object> map = new HashMap<String, Object>(16); if(ceList!=null&&ceList.size()>0){ for(Cell cell:ceList){ map.put(Bytes.toString(cell.getFamilyArray(),cell.getFamilyOffset(),cell.getFamilyLength())+ "_"+Bytes.toString( cell.getQualifierArray(),cell.getQualifierOffset(),cell.getQualifierLength()), Bytes.toString( cell.getValueArray(), cell.getValueOffset(), cell.getValueLength())); } } return map; } }); } /** * 通过表名 key 和 列族 和列 获取一个数据 * @param tableName * @param rowName * @param familyName * @param qualifier * @return */ public String get(String tableName ,String rowName, String familyName, String qualifier) { return hbaseTemplate.get(tableName, rowName,familyName,qualifier ,new RowMapper<String>(){ @Override public String mapRow(Result result, int i) throws Exception { List<Cell> ceList = result.listCells(); String res = ""; if(ceList!=null&&ceList.size()>0){ for(Cell cell:ceList){ res = Bytes.toString( cell.getValueArray(), cell.getValueOffset(), cell.getValueLength()); } } return res; } }); } /** * 通过表名，开始行键和结束行键获取数据 * @param tableName * @param startRow * @param stopRow * @return */ public List<Map<String,Object>> find(String tableName , String startRow,String stopRow) { Scan scan = new Scan(); if(startRow==null){ startRow=""; } if(stopRow==null){ stopRow=""; } scan.setStartRow(Bytes.toBytes(startRow)); scan.setStopRow(Bytes.toBytes(stopRow)); /* PageFilter filter = new PageFilter(5); scan.setFilter(filter);*/ return hbaseTemplate.find(tableName, scan,new RowMapper<Map<String,Object>>(){ @Override public Map<String,Object> mapRow(Result result, int rowNum) throws Exception { List<Cell> ceList = result.listCells(); Map<String,Object> map = new HashMap<String,Object>(); Map<String,Map<String,Object>> returnMap = new HashMap<String,Map<String,Object>>(); String row = ""; if(ceList!=null&&ceList.size()>0){ for(Cell cell:ceList){ row =Bytes.toString( cell.getRowArray(), cell.getRowOffset(), cell.getRowLength()); String value =Bytes.toString( cell.getValueArray(), cell.getValueOffset(), cell.getValueLength()); String family = Bytes.toString(cell.getFamilyArray(),cell.getFamilyOffset(),cell.getFamilyLength()); String quali = Bytes.toString( cell.getQualifierArray(),cell.getQualifierOffset(),cell.getQualifierLength()); map.put(family+"_"+quali, value); } map.put("row",row ); } return map; } }); } /** * 通过表名和key获取一行数据 * @param id * @return */ public Map<String,Object> get(String id){ Map<String,Object> map = hbaseTemplate.get(TABLE_NAME, id, (result, rowNum)->{ List<Cell> listCell = result.listCells(); Map<String,Object> cellMap = new HashMap<String, Object>(16); if(listCell!=null&&listCell.size()>0){ for(Cell cell:listCell){ cellMap.put(Bytes.toString(cell.getFamilyArray(),cell.getFamilyOffset(),cell.getFamilyLength())+ "_"+Bytes.toString( cell.getQualifierArray(),cell.getQualifierOffset(),cell.getQualifierLength()), Bytes.toString( cell.getValueArray(), cell.getValueOffset(), cell.getValueLength())); } } return cellMap; }); //补全查询的ID map.put("id", id); return map; } }