Support MSSQL batch statements (Resolves #652)

database/sqlserver/README.md

@@ -17,6 +17,7 @@
 | `encrypt` | | `disable` - Data send between client and server is not encrypted. `false` - Data sent between client and server is not encrypted beyond the login packet (Default). `true` - Data sent between client and server is encrypted. |
 | `app+name` || The application name (default is go-mssqldb). |
 | `useMsi` | | `true` - Use Azure MSI Authentication for connecting to Sql Server. Must be running from an Azure VM/an instance with MSI enabled. `false` - Use password authentication (Default). See [here for Azure MSI Auth details](https://docs.microsoft.com/en-us/azure/app-service/app-service-web-tutorial-connect-msi). NOTE: Since this cannot be tested locally, this is not officially supported.
+| `x-batch` | | Enable batch statements (default: false) |
 
 See https://github.com/denisenkom/go-mssqldb for full parameter list.
 

database/sqlserver/sqlserver.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"database/sql"
 	"fmt"
+	"github.com/denisenkom/go-mssqldb/batch"
 	"io"
 	"io/ioutil"
 	nurl "net/url"
@@ -43,9 +44,10 @@ var lockErrorMap = map[mssql.ReturnStatus]string{
 
 // Config for database
 type Config struct {
-	MigrationsTable string
-	DatabaseName    string
-	SchemaName      string
+	MigrationsTable       string
+	DatabaseName          string
+	SchemaName            string
+	BatchStatementEnabled bool
 }
 
 // SQL Server connection
@@ -169,9 +171,18 @@ func (ss *SQLServer) Open(url string) (database.Driver, error) {
 
 	migrationsTable := purl.Query().Get("x-migrations-table")
 
+	batchStatementEnabled := false
+	if s := purl.Query().Get("x-batch"); len(s) > 0 {
+		batchStatementEnabled, err = strconv.ParseBool(s)
+		if err != nil {
+			return nil, fmt.Errorf("Unable to parse option x-batch: %w", err)
+		}
+	}
+
 	px, err := WithInstance(db, &Config{
-		DatabaseName:    purl.Path,
-		MigrationsTable: migrationsTable,
+		DatabaseName:          purl.Path,
+		MigrationsTable:       migrationsTable,
+		BatchStatementEnabled: batchStatementEnabled,
 	})
 
 	if err != nil {
@@ -242,15 +253,23 @@ func (ss *SQLServer) Run(migration io.Reader) error {
 
 	// run migration
 	query := string(migr[:])
-	if _, err := ss.conn.ExecContext(context.Background(), query); err != nil {
-		if msErr, ok := err.(mssql.Error); ok {
-			message := fmt.Sprintf("migration failed: %s", msErr.Message)
-			if msErr.ProcName != "" {
-				message = fmt.Sprintf("%s (proc name %s)", msErr.Message, msErr.ProcName)
+	scripts := []string{query}
+
+	if ss.config.BatchStatementEnabled {
+		scripts = batch.Split(query, "go")
+	}
+
+	for _, script := range scripts {
+		if _, err := ss.conn.ExecContext(context.Background(), script); err != nil {
+			if msErr, ok := err.(mssql.Error); ok {
+				message := fmt.Sprintf("migration failed: %s", msErr.Message)
+				if msErr.ProcName != "" {
+					message = fmt.Sprintf("%s (proc name %s)", msErr.Message, msErr.ProcName)
+				}
+				return database.Error{OrigErr: err, Err: message, Query: []byte(script), Line: uint(msErr.LineNo)}
 			}
-			return database.Error{OrigErr: err, Err: message, Query: migr, Line: uint(msErr.LineNo)}
+			return database.Error{OrigErr: err, Err: "migration failed", Query: []byte(script)}
 		}
-		return database.Error{OrigErr: err, Err: "migration failed", Query: migr}
 	}
 
 	return nil

database/sqlserver/sqlserver_test.go

@@ -49,8 +49,9 @@ var (
 	}
 )
 
-func msConnectionString(host, port string) string {
-	return fmt.Sprintf("sqlserver://sa:%v@%v:%v?database=master", saPassword, host, port)
+func msConnectionString(host, port string, options ...string) string {
+	options = append(options, "database=master")
+	return fmt.Sprintf("sqlserver://sa:%v@%v:%v?%s", saPassword, host, port, strings.Join(options, "&"))
 }
 
 func msConnectionStringMsiWithPassword(host, port string, useMsi bool) string {
@@ -183,6 +184,49 @@ func TestMultiStatement(t *testing.T) {
 	})
 }
 
+func TestBatchedStatement(t *testing.T) {
+	dktesting.ParallelTest(t, specs, func(t *testing.T, c dktest.ContainerInfo) {
+		ip, port, err := c.Port(defaultPort)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		addr := msConnectionString(ip, port, "x-batch=true")
+		ms := &SQLServer{}
+		d, err := ms.Open(addr)
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer func() {
+			if err := d.Close(); err != nil {
+				t.Error(err)
+			}
+		}()
+		if err := d.Run(strings.NewReader(`CREATE PROCEDURE uspA
+AS
+BEGIN
+    SELECT 1;
+END;
+GO
+CREATE PROCEDURE uspB
+AS
+BEGIN
+    SELECT 2;
+END`)); err != nil {
+			t.Fatalf("expected err to be nil, got %v", err)
+		}
+
+		// make sure second proc exists
+		var exists int
+		if err := d.(*SQLServer).conn.QueryRowContext(context.Background(), "Select COUNT(1) from sysobjects where type = 'P' and category = 0 and [NAME] = 'uspB'").Scan(&exists); err != nil {
+			t.Fatal(err)
+		}
+		if exists != 1 {
+			t.Fatalf("expected proc uspB to exist")
+		}
+	})
+}
+
 func TestErrorParsing(t *testing.T) {
 	dktesting.ParallelTest(t, specs, func(t *testing.T, c dktest.ContainerInfo) {
 		SkipIfUnsupportedArch(t, c)