Repository: microsoft/go-mssqldb
Pull request #238 (2025-03-04 19:10:42)

Add JSON-encoded version of NULL uniqueidentifier
* as literal name according RFC 7159
* remove panic: encoding/hex: invalid byte: U+006E 'n'

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sedbygo: @microsoft-github-policy-service agree
codecov-commenter: ## [Codecov](https://app.codecov.io/gh/microsoft/go-mssqldb/pull/238?dropdown=coverage&src=pr&el=h1&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=microsoft) Report
Attention: Patch coverage is `80.00000%` with `1 line` in your changes missing coverage. Please review.
> Project coverage is 74.72%. Comparing base [(`ba24acc`)](https://app.codecov.io/gh/microsoft/go-mssqldb/commit/ba24acc31dbeabb88c676f940a7ea18fba59f3e3?dropdown=coverage&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=microsoft) to head [(`dffafc3`)](https://app.codecov.io/gh/microsoft/go-mssqldb/commit/dffafc39b0ab3254a7f98712901b0af74d78bafe?dropdown=coverage&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=microsoft).

| [Files with missing lines](https://app.codecov.io/gh/microsoft/go-mssqldb/pull/238?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=microsoft) | Patch % | Lines |
|---|---|---|
| [uniqueidentifier\_null.go](https://app.codecov.io/gh/microsoft/go-mssqldb/pull/238?src=pr&el=tree&filepath=uniqueidentifier_null.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=microsoft#diff-dW5pcXVlaWRlbnRpZmllcl9udWxsLmdv) | 80.00% | [1 Missing :warning: ](https://app.codecov.io/gh/microsoft/go-mssqldb/pull/238?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=microsoft) |

<details><summary>Additional details and impacted files</summary>


```diff
@@            Coverage Diff             @@
##             main     #238      +/-   ##
==========================================
- Coverage   74.77%   74.72%   -0.05%     
==========================================
  Files          32       31       -1     
  Lines        6457     6453       -4     
==========================================
- Hits         4828     4822       -6     
- Misses       1338     1340       +2     
  Partials      291      291              
```

</details>

[:umbrella: View full report in Codecov by Sentry](https://app.codecov.io/gh/microsoft/go-mssqldb/pull/238?dropdown=coverage&src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=microsoft).   
:loudspeaker: Have feedback on the report? [Share it here](https://about.codecov.io/codecov-pr-comment-feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=microsoft).


Patch:
diff --git a/.github/workflows/pr-validation.yml b/.github/workflows/pr-validation.yml
index 3a8f831..5ddcfb4 100644
--- a/.github/workflows/pr-validation.yml
+++ b/.github/workflows/pr-validation.yml
@@ -25,8 +25,7 @@ jobs:
         export SQLCMDUSER=sa
         export SQLUSER=sa
         export SQLPASSWORD=$SQLCMDPASSWORD
-        export DATABASE=test
+        export DATABASE=master
         docker run -m 2GB -e ACCEPT_EULA=1 -d --name sqlserver -p:1433:1433 -e SA_PASSWORD=$SQLCMDPASSWORD mcr.microsoft.com/mssql/server:${{ matrix.sqlImage }}
         sleep 10
-        sqlcmd -Q "CREATE DATABASE test"
         go test -v ./...
diff --git a/uniqueidentifier_null.go b/uniqueidentifier_null.go
index a9c4ba4..260d693 100644
--- a/uniqueidentifier_null.go
+++ b/uniqueidentifier_null.go
@@ -2,6 +2,7 @@ package mssql
 
 import (
 	"database/sql/driver"
+	"encoding/json"
 )
 
 type NullUniqueIdentifier struct {
@@ -63,3 +64,10 @@ func (n *NullUniqueIdentifier) UnmarshalJSON(b []byte) error {
 	}
 	return err
 }
+
+func (n NullUniqueIdentifier) MarshalJSON() ([]byte, error) {
+	if !n.Valid {
+		return []byte("null"), nil
+	}
+	return json.Marshal(n.UUID)
+}


Test patch:
diff --git a/.pipelines/TestSql2017.yml b/.pipelines/TestSql2017.yml
index 05b370a..388f253 100644
--- a/.pipelines/TestSql2017.yml
+++ b/.pipelines/TestSql2017.yml
@@ -8,7 +8,7 @@ variables:
 steps: 
 - task: GoTool@0
   inputs:
-    version: '1.20'
+    version: '1.22.10'
 
 - task: Go@0
   displayName: 'Go: install gotest.tools/gotestsum'
diff --git a/uniqueidentifier_null_test.go b/uniqueidentifier_null_test.go
index dc29276..8897281 100644
--- a/uniqueidentifier_null_test.go
+++ b/uniqueidentifier_null_test.go
@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"database/sql"
 	"database/sql/driver"
+	"encoding/json"
 	"fmt"
 	"reflect"
 	"testing"
@@ -210,6 +211,42 @@ func TestNullableUniqueIdentifierUnmarshalJSONNull(t *testing.T) {
 	}
 }
 
-var _ fmt.Stringer = NullUniqueIdentifier{}
-var _ sql.Scanner = &NullUniqueIdentifier{}
-var _ driver.Valuer = NullUniqueIdentifier{}
+func TestNullableUniqueIdentifierMarshalJSONNull(t *testing.T) {
+	t.Parallel()
+	nullUUID := NullUniqueIdentifier{
+		UUID:  [16]byte{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
+		Valid: false,
+	}
+
+	got, err := nullUUID.MarshalJSON()
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := []byte{0x6e, 0x75, 0x6c, 0x6c} // null = %x6e.75.6c.6c
+	if !reflect.DeepEqual(got, want) {
+		t.Errorf("got %v; want %v", got, want)
+	}
+}
+
+func TestNullableUniqueIdentifierJSONMarshalNull(t *testing.T) {
+	t.Parallel()
+	nullUUID := NullUniqueIdentifier{
+		UUID:  [16]byte{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
+		Valid: false,
+	}
+
+	got, err := json.Marshal(nullUUID)
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := []byte{0x6e, 0x75, 0x6c, 0x6c}
+	if !reflect.DeepEqual(got, want) {
+		t.Errorf("got %v; want %v", got, want)
+	}
+}
+
+var (
+	_ fmt.Stringer  = NullUniqueIdentifier{}
+	_ sql.Scanner   = &NullUniqueIdentifier{}
+	_ driver.Valuer = NullUniqueIdentifier{}
+)