吴超老师课程--HBASE的Java_API

  • Z时代
  • 2024-01-10
  • 分类：综合

java

public static void main(String[] args) throws IOException {
    String tableName="hbase_tb";
    String columnFamily="cf";
    HBaseTestCase.create(tableName, columnFamily);
    HBaseTestCase.put(tableName, "row1", columnFamily, "cl1", "data");
    HBaseTestCase.get(tableName, "row1");
    HBaseTestCase.scan(tableName);
    HBaseTestCase.delete(tableName);
}
1 //hbase操作必备
2     private static Configuration getConfiguration() {
3         Configuration conf = HBaseConfiguration.create();
4         conf.set("hbase.rootdir", "hdfs://hadoop:9000/hbase");
5         //使用eclipse时必须添加这个，否则无法定位
6         conf.set("hbase.zookeeper.quorum", "hadoop");
7         return conf;
8     }
 1 //创建一张表
 2 public static void create(String tableName, String columnFamily) throws IOException{
 3     HBaseAdmin admin = new HBaseAdmin(getConfiguration());
 4     if (admin.tableExists(tableName)) {
 5         System.out.println("table exists!");
 6     }else{
 7         HTableDescriptor tableDesc = new HTableDescriptor(tableName);
 8         tableDesc.addFamily(new HColumnDescriptor(columnFamily));
 9         admin.createTable(tableDesc);
10         System.out.println("create table success!");
11     }
12 }
1 //添加一条记录
2 public static void put(String tableName, String row, String columnFamily, String column, String data) throws IOException{
3     HTable table = new HTable(getConfiguration(), tableName);
4     Put p1 = new Put(Bytes.toBytes(row));
5     p1.add(Bytes.toBytes(columnFamily), Bytes.toBytes(column),     Bytes.toBytes(data));
6     table.put(p1);
7     System.out.println("put'"+row+"',"+columnFamily+":"+column+"','"+data+"'");
8 }
1 //读取一条记录
2 public static void get(String tableName, String row) throws IOException{
3     HTable table = new HTable(getConfiguration(), tableName);
4     Get get = new Get(Bytes.toBytes(row));
5     Result result = table.get(get);
6     System.out.println("Get: "+result);
7 }
1 //显示所有数据
2 public static void scan(String tableName) throws IOException{
3     HTable table = new HTable(getConfiguration(), tableName);
4     Scan scan = new Scan();
5     ResultScanner scanner = table.getScanner(scan);
6     for (Result result : scanner) {
7         System.out.println("Scan: "+result);
8     }
9 }
 1 //删除表
 2 public static void delete(String tableName) throws IOException{
 3     HBaseAdmin admin = new HBaseAdmin(getConfiguration());
 4     if(admin.tableExists(tableName)){
 5         try {
 6           admin.disableTable(tableName);
 7           admin.deleteTable(tableName);
 8         } catch (IOException e) {
 9           e.printStackTrace();
10           System.out.println("Delete "+tableName+" 失败");
11         }
12     }
13     System.out.println("Delete "+tableName+" 成功");
14 }


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