How to use

readRowUsingIndex

method

in

com.google.cloud.spanner.ReadContext

@Override
@Nullable
public Struct readRowUsingIndex(String table, String index, Key key, Iterable<String> columns) {
 try {
  session.markUsed();
  return delegate.readRowUsingIndex(table, index, key, columns);
 } finally {
  if (isSingleUse) {
   close();
  }
 }
}

Struct readRowUsingIndex() {
 // [START read_context_read_index]
 ReadContext readContext = dbClient.singleUse();
 Struct row =
   readContext.readRowUsingIndex(
     "Albums",
     "AlbumsByAlbumId",
     Key.of(1, "Green"),
     Arrays.asList("AlbumId", "AlbumTitle"));
 // [END read_context_read_index]
 return row;
}

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

@Test
public void indexPointRead() {
 Struct row =
   client
     .singleUse(TimestampBound.strong())
     .readRowUsingIndex(TABLE_NAME, INDEX_NAME, Key.of("v1"), ALL_COLUMNS);
 assertThat(row).isNotNull();
 assertThat(row.getString(0)).isEqualTo("k1");
 assertThat(row.getString(1)).isEqualTo("v1");
}

@Nullable
@Override
public Struct readRowUsingIndex(
    String s, String s1, Key key, Iterable<String> iterable) {
  return targetTransactionContext.readRowUsingIndex(s, s1, key, iterable);
}

@Nullable
@Override
public Struct readRowUsingIndex(
    String s, String s1, Key key, Iterable<String> iterable) {
  return targetTransactionContext.readRowUsingIndex(s, s1, key, iterable);
}

@Override
@Nullable
public Struct readRowUsingIndex(String table, String index, Key key, Iterable<String> columns) {
 try {
  session.markUsed();
  return delegate.readRowUsingIndex(table, index, key, columns);
 } finally {
  if (isSingleUse) {
   close();
  }
 }
}