希望能够通过ODBC使用BigQuery。我已经通过ODBC使用MySQL,这将使我能够将BigQuery作为我的大数据表的MySQL替代品。
希望能够通过ODBC使用BigQuery。我已经通过ODBC使用MySQL,这将使我能够将BigQuery作为我的大数据表的MySQL替代品。
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Odbc;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace BigQueryE2E
{
/**
* Helper class to build an ODBC Connection to connect to a Simba
* BigQuery ODBC Driver.
*/
class ConnectionBuilder {
private String Dsn;
private String Catalog;
private String ExecCatalog;
private bool UseNativeQuery;
public ConnectionBuilder SetDsn(String dsn) {
Dsn = dsn;
return this;
}
public ConnectionBuilder SetCatalog(String catalog) {
Catalog = catalog;
return this;
}
public ConnectionBuilder SetBillingCatalog(String catalog) {
ExecCatalog = catalog;
return this;
}
public ConnectionBuilder SetUseNativeQuery(bool nativeQuery) {
UseNativeQuery = nativeQuery;
return this;
}
public OdbcConnection Build() {
if (Catalog == null || Dsn == null) {
throw new ArgumentException("Missing required Connection setting");
}
StringBuilder connectionString = new StringBuilder();
connectionString.AppendFormat("DSN={0}; Catalog={1};", Dsn, Catalog);
if (ExecCatalog != null) {
connectionString.AppendFormat("ExecCatalog={0};", ExecCatalog);
}
if (UseNativeQuery) {
connectionString.Append("UseNativeQuery=1");
}
OdbcConnection conn = new OdbcConnection();
conn.ConnectionString = connectionString.ToString();
return conn;
}
}
class Program {
private static String Query =
"SELECT corpus, SUM(word_count) " +
"FROM samples.shakespeare " +
"GROUP BY corpus";
private static void PrintResults(OdbcDataReader reader) {
for (int ii = 0; ii < reader.FieldCount; ii += 1) {
System.Console.Write("{0}{1}",
reader.GetName(ii),
ii + 1 < reader.FieldCount ? "\t" : "\n");
}
while (reader.Read()) {
for (int ii = 0; ii < reader.FieldCount; ii += 1) {
System.Console.Write("{0}{1}",
reader.GetValue(ii),
ii + 1 < reader.FieldCount ? "\t" : "\n");
}
}
}
static void Main(string[] args) {
OdbcConnection connection = new ConnectionBuilder()
.SetDsn("bigquery1")
.SetCatalog("publicdata")
.SetBillingCatalog("bigquery-e2e")
.Build();
try {
connection.Open();
using (OdbcCommand command = connection.CreateCommand()) {
command.CommandText = Query;
using (OdbcDataReader reader = command.ExecuteReader()) {
PrintResults(reader);
}
}
} catch (Exception ex) {
System.Console.WriteLine("Error {0}: {1}",
connection.State != ConnectionState.Open
? "opening connection" : "executing query",
ex);
} finally {
connection.Close();
}
System.Console.ReadKey();
}
}
}