本文整理了Java中com.google.cloud.spanner.Key类的一些代码示例，展示了Key类的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Key类的具体详情如下：
包路径：com.google.cloud.spanner.Key
类名称：Key

Key介绍

[英]Represents a row key in a Cloud Spanner table or index. A key is a tuple of values constrained to the scalar Cloud Spanner types: currently these are BOOLEAN, INT64, FLOAT64, STRING, BYTES and TIMESTAMP. Values may be null where the table definition permits it.

Key is used to define the row, or endpoints of a range of rows, to retrieve in read operations or to delete in a mutation.

Key instances are immutable.
[中]表示云扳手表或索引中的行键。键是受标量云扳手类型约束的值的元组：目前这些类型是BOOLEAN、INT64、FLOAT64、STRING、BYTES和TIMESTAMP。在表定义允许的情况下，值可以为null。
键用于定义行或一系列行的端点，以便在读取操作中检索或在变异中删除。
关键实例是不可变的。

代码示例

代码示例来源：origin: googleapis/google-cloud-java

@Override
 public void run() {
  client
    .singleUse(TimestampBound.strong())
    .readRow(TABLE_NAME, Key.of("k1"), ALL_COLUMNS);
 }
});

代码示例来源：origin: googleapis/google-cloud-java

@Test
public void toBuilder() {
 Key k = Key.of(1, 2).toBuilder().append(3).build();
 assertThat(k.size()).isEqualTo(3);
 assertThat(k.getParts()).containsExactly(1L, 2L, 3L).inOrder();
}

代码示例来源：origin: googleapis/google-cloud-java

@Test
public void testToString() {
 assertThat(Key.of().toString()).isEqualTo("[]");
 assertThat(Key.of(new Object[] {null}).toString()).isEqualTo("[<null>]");
 assertThat(Key.of(true).toString()).isEqualTo("[true]");
 assertThat(Key.of(32).toString()).isEqualTo("[32]");
 assertThat(Key.of(2.0).toString()).isEqualTo("[2.0]");
 assertThat(Key.of("xyz").toString()).isEqualTo("[xyz]");
 ByteArray b = ByteArray.copyFrom("xyz");
 assertThat(Key.of(b).toString()).isEqualTo("[" + b.toString() + "]");
 String timestamp = "2015-09-15T00:00:00Z";
 assertThat(Key.of(Timestamp.parseTimestamp(timestamp)).toString())
   .isEqualTo("[" + timestamp + "]");
 String date = "2015-09-15";
 assertThat(Key.of(Date.parseDate(date)).toString()).isEqualTo("[" + date + "]");
 assertThat(Key.of(1, 2, 3).toString()).isEqualTo("[1,2,3]");
}

代码示例来源：origin: googleapis/google-cloud-java

@Test
public void indexPointReadNotFound() {
 Struct row =
   client
     .singleUse(TimestampBound.strong())
     .readRowUsingIndex(TABLE_NAME, INDEX_NAME, Key.of("v999"), ALL_COLUMNS);
 assertThat(row).isNull();
}

代码示例来源：origin: googleapis/google-cloud-java

@Test
public void rollback() {
 TransactionManager manager = client.transactionManager();
 TransactionContext txn = manager.begin();
 txn.buffer(
   Mutation.newInsertBuilder("T").set("K").to("Key2").set("BoolValue").to(true).build());
 manager.rollback();
 assertThat(manager.getState()).isEqualTo(TransactionState.ROLLED_BACK);
 // Row should not have been inserted.
 assertThat(client.singleUse().readRow("T", Key.of("Key2"), Arrays.asList("K", "BoolValue")))
   .isNull();
}

代码示例来源：origin: googleapis/google-cloud-java

@Test
public void emptyRead() {
 ResultSet resultSet =
   client
     .singleUse(TimestampBound.strong())
     .read(
       TABLE_NAME,
       KeySet.range(KeyRange.closedOpen(Key.of("k99"), Key.of("z"))),
       ALL_COLUMNS);
 assertThat(resultSet.next()).isFalse();
 assertThat(resultSet.getType()).isEqualTo(TABLE_TYPE);
}

代码示例来源：origin: googleapis/google-cloud-java

@Test
public void indexEmptyRead() {
 ResultSet resultSet =
   client
     .singleUse(TimestampBound.strong())
     .readUsingIndex(
       TABLE_NAME,
       INDEX_NAME,
       KeySet.range(KeyRange.closedOpen(Key.of("v99"), Key.of("z"))),
       ALL_COLUMNS);
 assertThat(resultSet.next()).isFalse();
 assertThat(resultSet.getType()).isEqualTo(TABLE_TYPE);
}

代码示例来源：origin: googleapis/google-cloud-java

@Test
public void testToString() {
 assertThat(KeySet.all().toString()).isEqualTo("{<all>}");
 assertThat(KeySet.singleKey(Key.of("x")).toString()).isEqualTo("{[x]}");
 assertThat(KeySet.range(KeyRange.closedOpen(Key.of("a"), Key.of("z"))).toString())
   .isEqualTo("{[[a],[z])}");
}

代码示例来源：origin: googleapis/google-cloud-java

@Test
public void testToString() {
 assertThat(KeyRange.closedOpen(Key.of("a"), Key.of("b")).toString()).isEqualTo("[[a],[b])");
 assertThat(KeyRange.closedClosed(Key.of("a"), Key.of("b")).toString()).isEqualTo("[[a],[b]]");
 assertThat(KeyRange.openOpen(Key.of("a"), Key.of("b")).toString()).isEqualTo("([a],[b])");
 assertThat(KeyRange.openClosed(Key.of("a"), Key.of("b")).toString()).isEqualTo("([a],[b]]");
 assertThat(KeyRange.closedClosed(Key.of(), Key.of()).toString()).isEqualTo("[[],[]]");
}

代码示例来源：origin: googleapis/google-cloud-java

@Test
public void toBuilder() {
 KeySet set = KeySet.singleKey(Key.of(1)).toBuilder().addKey(Key.of(2)).build();
 assertThat(set.isAll()).isFalse();
 assertThat(set.getKeys()).containsExactly(Key.of(1), Key.of(2)).inOrder();
 assertThat(set.getRanges()).isEmpty();
 set =
   KeySet.range(KeyRange.closedOpen(Key.of("a"), Key.of("b")))
     .toBuilder()
     .addRange(KeyRange.closedOpen(Key.of("c"), Key.of("d")))
     .build();
 assertThat(set.isAll()).isFalse();
 assertThat(set.getKeys()).isEmpty();
 assertThat(set.getRanges())
   .containsExactly(
     KeyRange.closedOpen(Key.of("a"), Key.of("b")),
     KeyRange.closedOpen(Key.of("c"), Key.of("d")))
   .inOrder();
 set = KeySet.all().toBuilder().addKey(Key.of(1)).build();
 assertThat(set.isAll()).isTrue();
 assertThat(set.getKeys()).containsExactly(Key.of(1));
 assertThat(set.getRanges()).isEmpty();
}

代码示例来源：origin: googleapis/google-cloud-java

@Test
public void range() {
 KeySet set = KeySet.range(KeyRange.closedOpen(Key.of("a"), Key.of("b")));
 assertThat(set.isAll()).isFalse();
 assertThat(set.getKeys()).isEmpty();
 assertThat(set.getRanges()).containsExactly(KeyRange.closedOpen(Key.of("a"), Key.of("b")));
}

代码示例来源：origin: googleapis/google-cloud-java

TransactionRunner runner = client.readWriteTransaction();
 runner.run(callable);
 fail("Expected user exception");
} catch (SpannerException e) {
 assertThat(e.getErrorCode()).isEqualTo(ErrorCode.UNKNOWN);
 assertThat(e.getMessage()).contains("failing to commit");
 assertThat(e.getCause()).isInstanceOf(UserException.class);
    .singleUse(TimestampBound.strong())
    .read("T", KeySet.range(KeyRange.prefix(Key.of("boo"))), Arrays.asList("K"));
assertThat(resultSet.next()).isFalse();

代码示例来源：origin: googleapis/google-cloud-java

@Test
public void builder() {
 KeySet set =
   KeySet.newBuilder()
     .addKey(Key.of("k1"))
     .addKey(Key.of("k2"))
     .addRange(KeyRange.closedOpen(Key.of("r1"), Key.of("rr1")))
     .addRange(KeyRange.closedOpen(Key.of("r2"), Key.of("rr2")))
     .build();
 assertThat(set.isAll()).isFalse();
 // Order isn't strictly important to the API, but it's helpful to preserve it.
 assertThat(set.getKeys()).containsExactly(Key.of("k1"), Key.of("k2")).inOrder();
 assertThat(set.getRanges())
   .containsExactly(
     KeyRange.closedOpen(Key.of("r1"), Key.of("rr1")),
     KeyRange.closedOpen(Key.of("r2"), Key.of("rr2")))
   .inOrder();
 assertThat(set.toString()).isEqualTo("{[k1],[k2],[[r1],[rr1]),[[r2],[rr2])}");
}

代码示例来源：origin: googleapis/google-cloud-java

@Test
public void prefixRange() {
 KeySet set = KeySet.prefixRange(Key.of("a", "b"));
 assertThat(set.isAll()).isFalse();
 assertThat(set.getKeys()).isEmpty();
 assertThat(set.getRanges()).containsExactly(KeyRange.prefix(Key.of("a", "b")));
}

代码示例来源：origin: googleapis/google-cloud-java

@Test
public void rowsAreSnapshots() {
 List<Struct> rows = new ArrayList<>();
 ResultSet resultSet =
   client
     .singleUse(TimestampBound.strong())
     .read(
       TABLE_NAME,
       KeySet.newBuilder()
         .addKey(Key.of("k2"))
         .addKey(Key.of("k3"))
         .addKey(Key.of("k4"))
         .build(),
       ALL_COLUMNS);
 while (resultSet.next()) {
  rows.add(resultSet.getCurrentRowAsStruct());
 }
 assertThat(rows.size()).isEqualTo(3);
 assertThat(rows.get(0).getString(0)).isEqualTo("k2");
 assertThat(rows.get(0).getString(1)).isEqualTo("v2");
 assertThat(rows.get(1).getString(0)).isEqualTo("k3");
 assertThat(rows.get(1).getString(1)).isEqualTo("v3");
 assertThat(rows.get(2).getString(0)).isEqualTo("k4");
 assertThat(rows.get(2).getString(1)).isEqualTo("v4");
}

代码示例来源：origin: googleapis/google-cloud-java

@Test
public void singleKey() {
 KeySet set = KeySet.singleKey(Key.of("a", "b", "c"));
 assertThat(set.isAll()).isFalse();
 assertThat(set.getKeys()).containsExactly(Key.of("a", "b", "c"));
 assertThat(set.getRanges()).isEmpty();
}

代码示例来源：origin: googleapis/google-cloud-java

@Test
public void toProtoCoalescingDelete() {
 List<Mutation> mutations =
   Arrays.asList(
     Mutation.delete("T", Key.of("k1")),
     Mutation.delete("T", Key.of("k2")),
     Mutation.delete("T", KeySet.range(KeyRange.closedOpen(Key.of("ka"), Key.of("kb")))),
     Mutation.delete("T", KeySet.range(KeyRange.closedClosed(Key.of("kc"), Key.of("kd")))));
 List<com.google.spanner.v1.Mutation> proto = new ArrayList<>();
 Mutation.toProto(mutations, proto);
 assertThat(proto.size()).isEqualTo(1);
 MatcherAssert.assertThat(
   proto.get(0),
   matchesProto(
     "delete {"
       + "  table: 'T'"
       + "  key_set {"
       + "    keys { values { string_value: 'k1' } }"
       + "    keys { values { string_value: 'k2' } }"
       + "    ranges { start_closed { values { string_value: 'ka' } } "
       + "             end_open { values { string_value: 'kb' } } }"
       + "    ranges { start_closed { values { string_value: 'kc' } } "
       + "             end_closed { values { string_value: 'kd' } } }"
       + "  }"
       + "} "));
}

代码示例来源：origin: googleapis/google-cloud-java

@Test
public void delete() {
 KeySet keySet = KeySet.singleKey(Key.of("k1"));
 Mutation m = Mutation.delete("T1", keySet);
 assertThat(m.getOperation()).isEqualTo(Mutation.Op.DELETE);
 assertThat(m.getKeySet()).isEqualTo(keySet);
 assertThat(m.toString()).isEqualTo("delete(T1{[k1]})");
}

代码示例来源：origin: googleapis/google-cloud-java

@Override
 public Void run(TransactionContext transaction) {
  long rowCount =
    transaction.executeUpdate(Statement.of("UPDATE T SET v = v * 2 WHERE k = 'boo2';"));
  assertThat(rowCount).isEqualTo(1);
  assertThat(transaction.readRow("T", Key.of("boo2"), Arrays.asList("v")).getLong(0))
    .isEqualTo(2 * 2);
  return null;
 }
};

代码示例来源：origin: googleapis/google-cloud-java

@Test
public void singleUseReadOnlyTransactionDoesntReturnTransactionMetadata() {
 PartialResultSet resultSet =
   PartialResultSet.newBuilder()
     .setMetadata(newMetadata(Type.struct(Type.StructField.of("C", Type.string()))))
     .build();
 mockRead(resultSet);
 ReadOnlyTransaction txn = session.singleUseReadOnlyTransaction(TimestampBound.strong());
 assertThat(txn.readRow("Dummy", Key.of(), Arrays.asList("C"))).isNull();
 // For now, getReadTimestamp() will raise an ISE because it hasn't seen a timestamp.  It would
 // be better for the read to fail with an INTERNAL error, but we can't do that until txn
 // metadata is returned for failed reads (e.g., table-not-found) as well as successful ones.
 // TODO(user): Fix this.
 expectedException.expect(IllegalStateException.class);
 txn.getReadTimestamp();
}