chore: add grpc-server API for SpannerLib (#534)

* chore: add grpc-server API for SpannerLib

Adds a gRPC server that exposes the API of SpannerLib. This allows clients
to connect to run SpannerLib as a child process and connect to it using
gRPC.

* refactor(ruby): Introduce MessageHandler and Rows classes (#553)

* refactor: add new message handler in ruby wrapper

* chore: delay transaction activation until actual use (#552)

* chore: store temp TransactionOptions in connection state

Store temporary TransactionOptions in the connection state as local options. Local options
only apply to the current transaction. This simplifies the internal state handling of the
driver, as all transaction state should only be read from the connection state, and not
also from a temporary variable.

This also enables the use of a combination of temporary transaction options and using
SQL statements to set further options. The shared library always includes temporary
transaction options, as the BeginTransaction function accepts TransactionOptions as an
input argument. This meant that using SQL statements to set further transaction options
was not supported through the shared library.

* chore: delay transaction activation until actual use

Delay the actual transaction activation until the first actual usage of the transaction.
That is; the first time that a statement is being sent to Spanner. This allows the
application to amend the transaction options after calling BeginTx or executing
`BEGIN TRANSACTION`. The transaction options can be amended by executing a statement
like `SET TRANSACTION READ ONLY`.

* chore: update actions/checkout action to v5 (#555)

* fix: update all dependencies (#551)

* fix: update all dependencies

* chore: go mod tidy

---------

Co-authored-by: Knut Olav Løite <koloite@gmail.com>

* chore: add signal handler to remove temp file

* chore: add .NET gRPC wrapper (#539)

* fix: update dependency net.java.dev.jna:jna to v5.18.0 (#538)

* chore: update all dependencies (#537)

* fix: update all dependencies (#536)

* fix: update all dependencies

* chore: go mod tidy

---------

Co-authored-by: Knut Olav Løite <koloite@gmail.com>

* chore(main): release 1.18.1 (#525)

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

* fix: update module github.com/googleapis/go-sql-spanner to v1.18.1 (#540)

* chore: add .NET gRPC wrapper

Adds a gRPC wrapper for .NET. This wrapper uses the gRPC API to connect to SpannerLib.
The gRPC channel uses a Unix domain socket.

* fix: update dependency net.java.dev.jna:jna to v5.18.1 (#544)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
| [net.java.dev.jna:jna](https://redirect.github.com/java-native-access/jna) | `5.18.0` -> `5.18.1` | [![age](https://developer.mend.io/api/mc/badges/age/maven/net.java.dev.jna:jna/5.18.1?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/net.java.dev.jna:jna/5.18.0/5.18.1?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>java-native-access/jna (net.java.dev.jna:jna)</summary>

### [`v5.18.1`](https://redirect.github.com/java-native-access/jna/blob/HEAD/CHANGES.md#Release-5181)

[Compare Source](https://redirect.github.com/java-native-access/jna/compare/5.18.0...5.18.1)

\==============

## Bug Fixes

- [#&#8203;1686](https://redirect.github.com/java-native-access/jna/issues/1686): Fix `sortFields` race condition while getting fields - [@&#8203;bendk](https://redirect.github.com/bendk).

</details>

---

### Configuration

📅 **Schedule**: Branch creation - Between 12:00 AM and 03:59 AM ( * 0-3 * * * ) (UTC), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/). View the [repository job log](https://developer.mend.io/github/googleapis/go-sql-spanner).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MS4xMzEuOSIsInVwZGF0ZWRJblZlciI6IjQxLjEzMS45IiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6W119-->

* feat: add authority param support to DSN (#546)

Signed-off-by: Marco Pracucci <marco@pracucci.com>

* fix: update all dependencies (#542)

* fix: update all dependencies

* chore: go mod tidy

* build: add ByteBuddy for Java wrapper

---------

Co-authored-by: Knut Olav Løite <koloite@gmail.com>

* feat(ruby): Add Ruby FFI wrapper for spannerlib (#545)

* feat(ruby): add Ruby FFI wrapper for spannerlib

* chore(main): release 1.19.0 (#541)

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

* chore: store temp TransactionOptions in connection state (#548)

Store temporary TransactionOptions in the connection state as local options. Local options
only apply to the current transaction. This simplifies the internal state handling of the
driver, as all transaction state should only be read from the connection state, and not
also from a temporary variable.

This also enables the use of a combination of temporary transaction options and using
SQL statements to set further options. The shared library always includes temporary
transaction options, as the BeginTransaction function accepts TransactionOptions as an
input argument. This meant that using SQL statements to set further transaction options
was not supported through the shared library.

* feat: parse SET TRANSACTION statements (#549)

* feat: parse SET TRANSACTION statements

Parse SET TRANSACTION statements and translate these to SET LOCAL statements.
SET TRANSACTION may only be executed in a transaction block, and can only be
used for a specific, limited set of connection properties. The syntax is
specified by the SQL standard and PostgreSQL.

See also https://www.postgresql.org/docs/current/sql-set-transaction.html

This change only adds partial support. The following features will be added
in future changes:
1. SET TRANSACTION READ {WRITE | ONLY} is not picked up by the driver, as
   the type of transaction is set directly when BeginTx is called. A
   refactor of this transaction handling is needed to be able to pick up
   SET TRANSACTION READ ONLY / SET TRANSACTION READ WRITE statements that
   are executed after BeginTx has been called.
2. PostgreSQL allows multiple transaction modes to be set in a single
   SET TRANSACTION statement. E.g. the following is allowed:
   SET TRANSACTION READ WRITE, ISOLATION LEVEL SERIALIZABLE
   The current implementation only supports one transaction mode per
   SET statement.

* feat: support multiple transaction options in one statement

* feat: support transaction options in BEGIN statements (#550)

* feat: parse SET TRANSACTION statements

Parse SET TRANSACTION statements and translate these to SET LOCAL statements.
SET TRANSACTION may only be executed in a transaction block, and can only be
used for a specific, limited set of connection properties. The syntax is
specified by the SQL standard and PostgreSQL.

See also https://www.postgresql.org/docs/current/sql-set-transaction.html

This change only adds partial support. The following features will be added
in future changes:
1. SET TRANSACTION READ {WRITE | ONLY} is not picked up by the driver, as
   the type of transaction is set directly when BeginTx is called. A
   refactor of this transaction handling is needed to be able to pick up
   SET TRANSACTION READ ONLY / SET TRANSACTION READ WRITE statements that
   are executed after BeginTx has been called.
2. PostgreSQL allows multiple transaction modes to be set in a single
   SET TRANSACTION statement. E.g. the following is allowed:
   SET TRANSACTION READ WRITE, ISOLATION LEVEL SERIALIZABLE
   The current implementation only supports one transaction mode per
   SET statement.

* feat: support multiple transaction options in one statement

* feat: support transaction options in BEGIN statements

Adds support for including transaction options in BEGIN statements, like:

```sql
BEGIN READ ONLY;
BEGIN READ WRITE;
BEGIN TRANSACTION ISOLATION LEVEL REPEATABLE READ;
BEGIN READ WRITE, ISOLATION LEVEL SERIALIZABLE;
```

* chore: re-trigger checks

* chore: add timeout for server startup

---------

Signed-off-by: Marco Pracucci <marco@pracucci.com>
Co-authored-by: Mend Renovate <bot@renovateapp.com>
Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
Co-authored-by: Marco Pracucci <marco@pracucci.com>
Co-authored-by: aakashanandg <aakashanand@google.com>

* chore: return long instead of int

* chore: remove TODO

---------

Signed-off-by: Marco Pracucci <marco@pracucci.com>
Co-authored-by: aakashanandg <aakashanand@google.com>
Co-authored-by: Mend Renovate <bot@renovateapp.com>
Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
Co-authored-by: Marco Pracucci <marco@pracucci.com>

Author: 5 people

.github/workflows/integration-tests-on-emulator.yml

@@ -22,7 +22,7 @@ jobs:
         with:
           go-version: 1.25.x
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - name: Run Go integration tests on emulator
         run: go test -race
         env:

.github/workflows/spanner-lib-tests.yml

@@ -48,19 +48,27 @@ jobs:
       - name: Build shared library
         working-directory: spannerlib/shared
         run: go build -o spannerlib.so -buildmode=c-shared shared_lib.go
+      - name: Build gRPC server
+        working-directory: spannerlib/grpc-server
+        run: |
+          go build -o grpc_server server.go
+          chmod +x grpc_server
       - name: Copy to Java wrapper
         working-directory: spannerlib
         run: |
           echo "$RUNNER_OS"
           if [ "$RUNNER_OS" == "Windows" ]; then
             mkdir -p wrappers/spannerlib-java/src/main/resources/win32-x86-64
             cp shared/spannerlib.so wrappers/spannerlib-java/src/main/resources/win32-x86-64/spanner.dll
+            cp grpc-server/grpc_server wrappers/spannerlib-java/src/main/resources/win32-x86-64/grpc_server
           elif [ "$RUNNER_OS" == "macOS" ]; then
             mkdir -p wrappers/spannerlib-java/src/main/resources/darwin-aarch64
             cp shared/spannerlib.so wrappers/spannerlib-java/src/main/resources/darwin-aarch64/libspanner.dylib
+            cp grpc-server/grpc_server wrappers/spannerlib-java/src/main/resources/darwin-aarch64/grpc_server
           else
             mkdir -p wrappers/spannerlib-java/src/main/resources/linux-x86-64
             cp shared/spannerlib.so wrappers/spannerlib-java/src/main/resources/linux-x86-64/libspanner.so
+            cp grpc-server/grpc_server wrappers/spannerlib-java/src/main/resources/linux-x86-64/grpc_server
           fi
         shell: bash
       - name: ls spannerlib.so
@@ -89,6 +97,8 @@ jobs:
           go-version: ${{ matrix.go-version }}
       - name: Checkout code
         uses: actions/checkout@v4
+        with:
+          submodules: 'true'
       - name: Build shared library
         working-directory: spannerlib/shared
         run: go build -o spannerlib.so -buildmode=c-shared shared_lib.go
@@ -116,6 +126,34 @@ jobs:
           fi
         working-directory: spannerlib/wrappers/spannerlib-dotnet/spannerlib-dotnet-native
         shell: bash
+      - name: Build gRPC server
+        working-directory: spannerlib/grpc-server
+        run: |
+          go build -o grpc_server server.go
+          chmod +x grpc_server
+      - name: Copy gRPC server to .NET wrapper
+        working-directory: spannerlib
+        run: |
+          mkdir -p wrappers/spannerlib-dotnet/spannerlib-dotnet-grpc-server/binaries/any
+          if [ "$RUNNER_OS" == "Windows" ]; then
+            cp grpc-server/grpc_server wrappers/spannerlib-dotnet/spannerlib-dotnet-grpc-server/binaries/any/grpc_server.exe
+          else
+            cp grpc-server/grpc_server wrappers/spannerlib-dotnet/spannerlib-dotnet-grpc-server/binaries/any/grpc_server
+          fi
+        shell: bash
+      - name: Build .NET gRPC server package
+        run: dotnet pack
+        working-directory: spannerlib/wrappers/spannerlib-dotnet/spannerlib-dotnet-grpc-server
+        shell: bash
+      - name: Add .NET package source
+        run: |
+          if [ "$RUNNER_OS" == "Windows" ]; then
+            dotnet nuget add source ${GITHUB_WORKSPACE}"\spannerlib\wrappers\spannerlib-dotnet\spannerlib-dotnet-grpc-server\bin\Release" --name local-grpc-server
+          else
+            dotnet nuget add source "$PWD"/bin/Release --name local-grpc-server
+          fi
+        working-directory: spannerlib/wrappers/spannerlib-dotnet/spannerlib-dotnet-grpc-server
+        shell: bash
       - name: Restore dependencies
         run: dotnet restore
         working-directory: spannerlib/wrappers/spannerlib-dotnet

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "spannerlib/grpc-server/googleapis"]
+	path = spannerlib/grpc-server/googleapis
+	url = git@github.com:googleapis/googleapis.git

aborted_transactions_test.go

@@ -41,6 +41,9 @@ func TestCommitAborted(t *testing.T) {
 	if err != nil {
 		t.Fatalf("begin failed: %v", err)
 	}
+	if _, err := tx.ExecContext(ctx, testutil.UpdateBarSetFoo); err != nil {
+		t.Fatal(err)
+	}
 	server.TestSpanner.PutExecutionTime(testutil.MethodCommitTransaction, testutil.SimulatedExecutionTime{
 		Errors: []error{status.Error(codes.Aborted, "Aborted")},
 	})
@@ -51,7 +54,7 @@ func TestCommitAborted(t *testing.T) {
 	reqs := server.TestSpanner.DrainRequestsFromServer()
 	commitReqs := testutil.RequestsOfType(reqs, reflect.TypeOf(&sppb.CommitRequest{}))
 	if g, w := len(commitReqs), 2; g != w {
-		t.Fatalf("commit request count mismatch\nGot: %v\nWant: %v", g, w)
+		t.Fatalf("commit request count mismatch\n Got: %v\nWant: %v", g, w)
 	}
 
 	// Verify that the db is still usable.
@@ -117,6 +120,9 @@ func TestCommitAbortedWithInternalRetriesDisabled(t *testing.T) {
 	if err != nil {
 		t.Fatalf("begin failed: %v", err)
 	}
+	if _, err := tx.ExecContext(ctx, testutil.UpdateBarSetFoo); err != nil {
+		t.Fatal(err)
+	}
 	server.TestSpanner.PutExecutionTime(testutil.MethodCommitTransaction, testutil.SimulatedExecutionTime{
 		Errors: []error{status.Error(codes.Aborted, "Aborted")},
 	})

benchmarks/go.mod

@@ -2,23 +2,23 @@ module github.com/googleapis/go-sql-spanner/benchmarks
 
 go 1.24.0
 
-toolchain go1.25.1
+toolchain go1.25.2
 
 replace github.com/googleapis/go-sql-spanner => ../
 
 require (
 	cloud.google.com/go v0.123.0
 	cloud.google.com/go/spanner v1.86.0
 	github.com/google/uuid v1.6.0
-	github.com/googleapis/go-sql-spanner v1.18.1
-	google.golang.org/api v0.251.0
-	google.golang.org/grpc v1.75.1
+	github.com/googleapis/go-sql-spanner v1.19.0
+	google.golang.org/api v0.252.0
+	google.golang.org/grpc v1.76.0
 	google.golang.org/protobuf v1.36.10
 )
 
 require (
 	cel.dev/expr v0.24.0 // indirect
-	cloud.google.com/go/auth v0.16.5 // indirect
+	cloud.google.com/go/auth v0.17.0 // indirect
 	cloud.google.com/go/auth/oauth2adapt v0.2.8 // indirect
 	cloud.google.com/go/compute/metadata v0.9.0 // indirect
 	cloud.google.com/go/iam v1.5.2 // indirect
@@ -61,5 +61,5 @@ require (
 	golang.org/x/time v0.13.0 // indirect
 	google.golang.org/genproto v0.0.0-20250804133106-a7a43d27e69b // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20250818200422-3122310a409c // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20251002232023-7c0ddcbb5797 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20251007200510-49b9836ed3ff // indirect
 )

benchmarks/go.sum

@@ -101,8 +101,8 @@ cloud.google.com/go/assuredworkloads v1.7.0/go.mod h1:z/736/oNmtGAyU47reJgGN+KVo
 cloud.google.com/go/assuredworkloads v1.8.0/go.mod h1:AsX2cqyNCOvEQC8RMPnoc0yEarXQk6WEKkxYfL6kGIo=
 cloud.google.com/go/assuredworkloads v1.9.0/go.mod h1:kFuI1P78bplYtT77Tb1hi0FMxM0vVpRC7VVoJC3ZoT0=
 cloud.google.com/go/assuredworkloads v1.10.0/go.mod h1:kwdUQuXcedVdsIaKgKTp9t0UJkE5+PAVNhdQm4ZVq2E=
-cloud.google.com/go/auth v0.16.5 h1:mFWNQ2FEVWAliEQWpAdH80omXFokmrnbDhUS9cBywsI=
-cloud.google.com/go/auth v0.16.5/go.mod h1:utzRfHMP+Vv0mpOkTRQoWD2q3BatTOoWbA7gCc2dUhQ=
+cloud.google.com/go/auth v0.17.0 h1:74yCm7hCj2rUyyAocqnFzsAYXgJhrG26XCFimrc/Kz4=
+cloud.google.com/go/auth v0.17.0/go.mod h1:6wv/t5/6rOPAX4fJiRjKkJCvswLwdet7G8+UGXt7nCQ=
 cloud.google.com/go/auth/oauth2adapt v0.2.8 h1:keo8NaayQZ6wimpNSmW5OPc283g65QNIiLpZnkHRbnc=
 cloud.google.com/go/auth/oauth2adapt v0.2.8/go.mod h1:XQ9y31RkqZCcwJWNSx2Xvric3RrU88hAYYbjDWYDL+c=
 cloud.google.com/go/automl v1.5.0/go.mod h1:34EjfoFGMZ5sgJ9EoLsRtdPSNZLcfflJR39VbVNS2M0=
@@ -1371,8 +1371,8 @@ google.golang.org/api v0.108.0/go.mod h1:2Ts0XTHNVWxypznxWOYUeI4g3WdP9Pk2Qk58+a/
 google.golang.org/api v0.110.0/go.mod h1:7FC4Vvx1Mooxh8C5HWjzZHcavuS2f6pmJpZx60ca7iI=
 google.golang.org/api v0.111.0/go.mod h1:qtFHvU9mhgTJegR31csQ+rwxyUTHOKFqCKWp1J0fdw0=
 google.golang.org/api v0.114.0/go.mod h1:ifYI2ZsFK6/uGddGfAD5BMxlnkBqCmqHSDUVi45N5Yg=
-google.golang.org/api v0.251.0 h1:6lea5nHRT8RUmpy9kkC2PJYnhnDAB13LqrLSVQlMIE8=
-google.golang.org/api v0.251.0/go.mod h1:Rwy0lPf/TD7+T2VhYcffCHhyyInyuxGjICxdfLqT7KI=
+google.golang.org/api v0.252.0 h1:xfKJeAJaMwb8OC9fesr369rjciQ704AjU/psjkKURSI=
+google.golang.org/api v0.252.0/go.mod h1:dnHOv81x5RAmumZ7BWLShB/u7JZNeyalImxHmtTHxqw=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 google.golang.org/appengine v1.5.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
@@ -1516,8 +1516,8 @@ google.golang.org/genproto v0.0.0-20250804133106-a7a43d27e69b h1:eZTgydvqZO44zyT
 google.golang.org/genproto v0.0.0-20250804133106-a7a43d27e69b/go.mod h1:suyz2QBHQKlGIF92HEEsCfO1SwxXdk7PFLz+Zd9Uah4=
 google.golang.org/genproto/googleapis/api v0.0.0-20250818200422-3122310a409c h1:AtEkQdl5b6zsybXcbz00j1LwNodDuH6hVifIaNqk7NQ=
 google.golang.org/genproto/googleapis/api v0.0.0-20250818200422-3122310a409c/go.mod h1:ea2MjsO70ssTfCjiwHgI0ZFqcw45Ksuk2ckf9G468GA=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20251002232023-7c0ddcbb5797 h1:CirRxTOwnRWVLKzDNrs0CXAaVozJoR4G9xvdRecrdpk=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20251002232023-7c0ddcbb5797/go.mod h1:HSkG/KdJWusxU1F6CNrwNDjBMgisKxGnc5dAZfT0mjQ=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20251007200510-49b9836ed3ff h1:A90eA31Wq6HOMIQlLfzFwzqGKBTuaVztYu/g8sn+8Zc=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20251007200510-49b9836ed3ff/go.mod h1:7i2o+ce6H/6BluujYR+kqX3GKH+dChPTQU19wjRPiGk=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
 google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
@@ -1559,8 +1559,8 @@ google.golang.org/grpc v1.52.3/go.mod h1:pu6fVzoFb+NBYNAvQL08ic+lvB2IojljRYuun5v
 google.golang.org/grpc v1.53.0/go.mod h1:OnIrk0ipVdj4N5d9IUoFUx72/VlD7+jUsHwZgwSMQpw=
 google.golang.org/grpc v1.54.0/go.mod h1:PUSEXI6iWghWaB6lXM4knEgpJNu2qUcKfDtNci3EC2g=
 google.golang.org/grpc v1.56.3/go.mod h1:I9bI3vqKfayGqPUAwGdOSu7kt6oIJLixfffKrpXqQ9s=
-google.golang.org/grpc v1.75.1 h1:/ODCNEuf9VghjgO3rqLcfg8fiOP0nSluljWFlDxELLI=
-google.golang.org/grpc v1.75.1/go.mod h1:JtPAzKiq4v1xcAB2hydNlWI2RnF85XXcV0mhKXr2ecQ=
+google.golang.org/grpc v1.76.0 h1:UnVkv1+uMLYXoIz6o7chp59WfQUYA2ex/BXQ9rHZu7A=
+google.golang.org/grpc v1.76.0/go.mod h1:Ju12QI8M6iQJtbcsV+awF5a4hfJMLi4X0JLo94ULZ6c=
 google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.1.0/go.mod h1:6Kw0yEErY5E/yWrBtf03jp27GLLJujG4z/JK95pnjjw=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=

client_side_statement_test.go

@@ -65,7 +65,7 @@ func TestStatementExecutor_StartBatchDdl(t *testing.T) {
 	}
 
 	// Starting a DDL batch while the connection is in a transaction is not allowed.
-	c.tx = &readWriteTransaction{}
+	c.tx = &delegatingTransaction{conn: c, ctx: ctx}
 	if _, err := c.ExecContext(ctx, "start batch ddl", []driver.NamedValue{}); spanner.ErrCode(err) != codes.FailedPrecondition {
 		t.Fatalf("error mismatch for starting a DDL batch while in a transaction\nGot: %v\nWant: %v", spanner.ErrCode(err), codes.FailedPrecondition)
 	}
@@ -102,13 +102,13 @@ func TestStatementExecutor_StartBatchDml(t *testing.T) {
 	}
 
 	// Starting a DML batch while the connection is in a read-only transaction is not allowed.
-	c.tx = &readOnlyTransaction{logger: noopLogger}
+	c.tx = &delegatingTransaction{conn: c, contextTransaction: &readOnlyTransaction{logger: noopLogger}}
 	if _, err := c.ExecContext(ctx, "start batch dml", []driver.NamedValue{}); spanner.ErrCode(err) != codes.FailedPrecondition {
 		t.Fatalf("error mismatch for starting a DML batch while in a read-only transaction\nGot: %v\nWant: %v", spanner.ErrCode(err), codes.FailedPrecondition)
 	}
 
 	// Starting a DML batch while the connection is in a read/write transaction is allowed.
-	c.tx = &readWriteTransaction{logger: noopLogger}
+	c.tx = &delegatingTransaction{conn: c, contextTransaction: &readWriteTransaction{logger: noopLogger}}
 	if _, err := c.ExecContext(ctx, "start batch dml", []driver.NamedValue{}); err != nil {
 		t.Fatalf("could not start a DML batch while in a read/write transaction: %v", err)
 	}