private static async Task PrintReadRowsAsync(ReadRowsStream responseRead)
{
await responseRead.ForEachAsync(row =>
{
Console.WriteLine($"\tRow key: {row.Key.ToStringUtf8()} " +
$" -- Value: {row.Families[0].Columns[0].Cells[0].Value.ToStringUtf8(),-16} " +
$" -- Time Stamp: {row.Families[0].Columns[0].Cells[0].TimestampMicros}");
});
}
private static void DoHelloWorld()
{
try
{
// [START bigtable_hw_connect]
// BigtableTableAdminClient API lets us create, manage and delete tables.
BigtableTableAdminClient bigtableTableAdminClient = BigtableTableAdminClient.Create();
// BigtableClient API lets us read and write to a table.
BigtableClient bigtableClient = BigtableClient.Create();
// [END bigtable_hw_connect]
// [START bigtable_hw_create_table]
// Create a table with a single column family.
Console.WriteLine($"Create new table: {tableId} with column family: {columnFamily}, instance: {instanceId}");
// Check whether a table with given TableName already exists.
if (!TableExist(bigtableTableAdminClient))
{
bigtableTableAdminClient.CreateTable(
new InstanceName(projectId, instanceId),
tableId,
new Table
{
Granularity = Table.Types.TimestampGranularity.Millis,
ColumnFamilies =
{
{
columnFamily, new ColumnFamily
{
GcRule = new GcRule
{
MaxNumVersions = 1
}
}
}
}
});
// Confirm that table was created successfully.
Console.WriteLine(TableExist(bigtableTableAdminClient)
? $"Table {tableId} created successfully\n"
: $"There was a problem creating a table {tableId}");
}
else
{
Console.WriteLine($"Table: {tableId} already exists");
}
// [END bigtable_hw_create_table]
// [START bigtable_hw_write_rows]
// Initialize Google.Cloud.Bigtable.V2.TableName object.
Google.Cloud.Bigtable.Common.V2.TableName tableName = new Google.Cloud.Bigtable.Common.V2.TableName(projectId, instanceId, tableId);
// Write some rows
/* Each row has a unique row key.
*
* Note: This example uses sequential numeric IDs for simplicity, but
* this can result in poor performance in a production application.
* Since rows are stored in sorted order by key, sequential keys can
* result in poor distribution of operations across nodes.
*
* For more information about how to design a Bigtable schema for the
* best performance, see the documentation:
*
* https://cloud.google.com/bigtable/docs/schema-design */
Console.WriteLine($"Write some greetings to the table {tableId}");
// Insert 1 row using MutateRow()
s_greetingIndex = 0;
try
{
bigtableClient.MutateRow(tableName, rowKeyPrefix + s_greetingIndex, MutationBuilder());
Console.WriteLine($"\tGreeting: -- {s_greetings[s_greetingIndex],-18}-- written successfully");
}
catch (Exception ex)
{
Console.WriteLine($"\tFailed to write greeting: --{s_greetings[s_greetingIndex]}");
Console.WriteLine(ex.Message);
throw;
}
// Insert multiple rows using MutateRows()
// Build a MutateRowsRequest (contains table name and a collection of entries).
MutateRowsRequest request = new MutateRowsRequest
{
TableNameAsTableName = tableName
};
s_mapToOriginalGreetingIndex = new List <int>();
while (++s_greetingIndex < s_greetings.Length)
{
s_mapToOriginalGreetingIndex.Add(s_greetingIndex);
// Build an entry for every greeting (consists of rowkey and a collection of mutations).
string rowKey = rowKeyPrefix + s_greetingIndex;
request.Entries.Add(Mutations.CreateEntry(rowKey, MutationBuilder()));
}
// Make the request to write multiple rows.
MutateRowsResponse response = bigtableClient.MutateRows(request);
// Check the status code of each entry to ensure that it was written successfully.
foreach (MutateRowsResponse.Types.Entry entry in response.Entries)
{
s_greetingIndex = s_mapToOriginalGreetingIndex[(int)entry.Index];
if (entry.Status.Code == 0)
{
Console.WriteLine($"\tGreeting: -- {s_greetings[s_greetingIndex],-18}-- written successfully");
}
else
{
Console.WriteLine($"\tFailed to write greeting: --{s_greetings[s_greetingIndex]}");
Console.WriteLine(entry.Status.Message);
}
}
Mutation MutationBuilder() =>
Mutations.SetCell(columnFamily, columnName, s_greetings[s_greetingIndex], new BigtableVersion(DateTime.UtcNow));
//[END bigtable_hw_write_rows]
// [START bigtable_hw_create_filter]
RowFilter filter = RowFilters.CellsPerRowLimit(1);
// [END bigtable_hw_create_filter]
// [START bigtable_hw_get_with_filter]
// Read from the table.
Console.WriteLine("Read the first row");
int rowIndex = 0;
// Read a specific row. Apply a filter to return latest only cell value accross entire row.
Row rowRead = bigtableClient.ReadRow(
tableName, rowKey: rowKeyPrefix + rowIndex, filter: filter);
Console.WriteLine(
$"\tRow key: {rowRead.Key.ToStringUtf8()} " +
$" -- Value: {rowRead.Families[0].Columns[0].Cells[0].Value.ToStringUtf8(),-16} " +
$" -- Time Stamp: {rowRead.Families[0].Columns[0].Cells[0].TimestampMicros}");
// [END bigtable_hw_get_with_filter]
// [START bigtable_hw_scan_with_filter]
Console.WriteLine("Read all rows using streaming");
// stream the content of the whole table. Apply a filter to return latest only cell values accross all rows.
ReadRowsStream responseRead = bigtableClient.ReadRows(tableName, filter: filter);
Task printRead = PrintReadRowsAsync();
printRead.Wait();
async Task PrintReadRowsAsync()
{
await responseRead.ForEachAsync(row =>
{
Console.WriteLine($"\tRow key: {row.Key.ToStringUtf8()} " +
$" -- Value: {row.Families[0].Columns[0].Cells[0].Value.ToStringUtf8(),-16} " +
$" -- Time Stamp: {row.Families[0].Columns[0].Cells[0].TimestampMicros}");
});
}
// [END bigtable_hw_scan_with_filter]
// [START bigtable_hw_delete_table]
// Clean up. Delete the table.
Console.WriteLine($"Delete table: {tableId}");
bigtableTableAdminClient.DeleteTable(name: tableName);
if (!TableExist(bigtableTableAdminClient))
{
Console.WriteLine($"Table: {tableId} deleted successfully");
}
// [END bigtable_hw_delete_table]
}
catch (Exception ex)
{
Console.WriteLine($"Exception while running HelloWorld: {ex.Message}");
}
}
