Package org.apache.hadoop.hbase.client

Examples of org.apache.hadoop.hbase.client.HTable.checkAndDelete()

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      public Void run() throws Exception {
        Table t = new HTable(conf, TEST_TABLE.getTableName());
        try {
          Delete d = new Delete(TEST_ROW1);
          d.deleteColumn(TEST_FAMILY1, TEST_Q2, 120);
          t.checkAndDelete(TEST_ROW1, TEST_FAMILY1, TEST_Q2, ZERO, d);
        } finally {
          t.close();
        }
        return null;
      }
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      public Object run() throws Exception {
        Delete d = new Delete(Bytes.toBytes("random_row"));
        d.deleteFamily(TEST_FAMILY);

        HTable t = new HTable(conf, TEST_TABLE);
        t.checkAndDelete(Bytes.toBytes("random_row"),
                         TEST_FAMILY, Bytes.toBytes("q"),
                         Bytes.toBytes("test_value"), d);
        return null;
      }
    };
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      public Object run() throws Exception {
        Delete d = new Delete(Bytes.toBytes("random_row"));
        d.deleteFamily(TEST_FAMILY);

        HTable t = new HTable(conf, TEST_TABLE);
        t.checkAndDelete(Bytes.toBytes("random_row"), TEST_FAMILY, Bytes.toBytes("q"),
          Bytes.toBytes("test_value"), d);
        return null;
      }
    };
    verifyReadWrite(checkAndDeleteAction);
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    // vv CheckAndDeleteExample
    Delete delete1 = new Delete(Bytes.toBytes("row1"));
    delete1.deleteColumns(Bytes.toBytes("colfam1"), Bytes.toBytes("qual3")); // co CheckAndDeleteExample-1-Delete1 Create a new Delete instance.

    boolean res1 = table.checkAndDelete(Bytes.toBytes("row1"),
      Bytes.toBytes("colfam2"), Bytes.toBytes("qual3"), null, delete1); // co CheckAndDeleteExample-2-CAS1 Check if column does not exist and perform optional delete operation.
    System.out.println("Delete successful: " + res1); // co CheckAndDeleteExample-3-SOUT1 Print out the result, should be "Delete successful: false".

    Delete delete2 = new Delete(Bytes.toBytes("row1"));
    delete2.deleteColumns(Bytes.toBytes("colfam2"), Bytes.toBytes("qual3")); // co CheckAndDeleteExample-4-Delete2 Delete checked column manually.
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    Delete delete2 = new Delete(Bytes.toBytes("row1"));
    delete2.deleteColumns(Bytes.toBytes("colfam2"), Bytes.toBytes("qual3")); // co CheckAndDeleteExample-4-Delete2 Delete checked column manually.
    table.delete(delete2);

    boolean res2 = table.checkAndDelete(Bytes.toBytes("row1"),
      Bytes.toBytes("colfam2"), Bytes.toBytes("qual3"), null, delete1); // co CheckAndDeleteExample-5-CAS2 Attempt to delete same cell again.
    System.out.println("Delete successful: " + res2); // co CheckAndDeleteExample-6-SOUT2 Print out the result, should be "Delete successful: true" as the column now already exists.

    Delete delete3 = new Delete(Bytes.toBytes("row2"));
    delete3.deleteFamily(Bytes.toBytes("colfam1")); // co CheckAndDeleteExample-7-Delete3 Create yet another Delete instance, but using a different row.
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    Delete delete3 = new Delete(Bytes.toBytes("row2"));
    delete3.deleteFamily(Bytes.toBytes("colfam1")); // co CheckAndDeleteExample-7-Delete3 Create yet another Delete instance, but using a different row.

    try{
      boolean res4 = table.checkAndDelete(Bytes.toBytes("row1"),
        Bytes.toBytes("colfam1"), Bytes.toBytes("qual1"), // co CheckAndDeleteExample-8-CAS4 Try to delete while checking a different row.
        Bytes.toBytes("val1"), delete3);
      System.out.println("Delete successful: " + res4); // co CheckAndDeleteExample-9-SOUT4 We will not get here as an exception is thrown beforehand!
    } catch (Exception e) {
      System.err.println("Error: " + e);
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      public Object run() throws Exception {
        Delete d = new Delete(Bytes.toBytes("random_row"));
        d.deleteFamily(TEST_FAMILY);
        HTable t = new HTable(conf, TEST_TABLE);
        try {
          t.checkAndDelete(Bytes.toBytes("random_row"), TEST_FAMILY, Bytes.toBytes("q"),
            Bytes.toBytes("test_value"), d);
        } finally {
          t.close();
        }
        return null;
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