add one pseudo command get_driver_version

Author: HenryAtUber

examples/pc_get_driver_version.go

@@ -0,0 +1,59 @@
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package main
+
+import (
+	"context"
+	"database/sql"
+	"os"
+
+	secret "github.com/uber/athenadriver/examples/constants"
+	drv "github.com/uber/athenadriver/go"
+)
+
+func main() {
+	// 1. Set AWS Credential in Driver Config.
+	os.Setenv("AWS_SDK_LOAD_CONFIG", "1")
+	conf, err := drv.NewDefaultConfig(secret.OutputBucket, secret.Region, secret.AccessID, secret.SecretAccessKey)
+	conf.SetLogging(true)
+	if err != nil {
+		panic(err)
+		return
+	}
+
+	// 2. Open Connection.
+	dsn := conf.Stringify()
+	db, _ := sql.Open(drv.DriverName, dsn)
+
+	// 3. Query with pseudo command `pc:get_driver_version`
+	rows, err := db.QueryContext(context.Background(), "pc:get_driver_version")
+	if err != nil {
+		panic(err)
+	}
+	defer rows.Close()
+	println(drv.ColsRowsToCSV(rows))
+}
+
+/*
+Sample Output:
+_col0
+1.1.5
+*/

go/connection.go

@@ -240,6 +240,8 @@ func (c *Connection) QueryContext(ctx context.Context, query string, namedArgs [
 			query = strings.Trim(query[len(pseudoCommand):], " ")
 		} else if pseudoCommand = PCStopQID; strings.HasPrefix(query, pseudoCommand+" ") {
 			query = strings.Trim(query[len(pseudoCommand):], " ")
+		} else if pseudoCommand = PCGetDriverVersion; strings.HasPrefix(query, pseudoCommand) {
+			return c.getHeaderlessSingleRowResultPage(ctx, driverVersion)
 		} else {
 			return nil, fmt.Errorf("pseudo command " + query + "doesn't exist")
 		}

go/constants.go

@@ -103,3 +103,8 @@ const PCGetQIDStatus = "get_query_id_status"
 
 // PCStopQID is the pseudo command to stop a query execution id
 const PCStopQID = "stop_query_id"
+
+// PCGetDriverVersion is the pseudo command to get the version of athenadriver
+const PCGetDriverVersion = "get_driver_version"
+
+const driverVersion = "1.1.5"