Print headers when zero rows are returned

.github/workflows/pr-validation.yml

@@ -13,7 +13,7 @@ jobs:
     - name: Setup go
       uses: actions/setup-go@v2
       with:
-        go-version: '1.21'
+        go-version: '1.22'
     - name: Run tests against Linux SQL
       run: |
         go version

.pipelines/include-install-go-tools.yml

@@ -1,7 +1,7 @@
 steps: 
   - task: GoTool@0
     inputs:
-      version: '1.18'
+      version: '1.22'
   - task: Go@0
     displayName: 'Go: get dependencies'
     inputs:

go.mod

@@ -1,6 +1,6 @@
 module github.com/microsoft/go-sqlcmd
 
-go 1.21
+go 1.22
 
 require (
 	github.com/alecthomas/chroma/v2 v2.5.0
@@ -10,7 +10,7 @@ require (
 	github.com/docker/go-connections v0.4.0
 	github.com/golang-sql/sqlexp v0.1.0
 	github.com/google/uuid v1.6.0
-	github.com/microsoft/go-mssqldb v1.7.2
+	github.com/microsoft/go-mssqldb v1.8.0
 	github.com/opencontainers/image-spec v1.0.2
 	github.com/peterh/liner v1.2.2
 	github.com/pkg/errors v0.9.1

go.sum

@@ -251,6 +251,8 @@ github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0j
 github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
 github.com/microsoft/go-mssqldb v1.7.2 h1:CHkFJiObW7ItKTJfHo1QX7QBBD1iV+mn1eOyRP3b/PA=
 github.com/microsoft/go-mssqldb v1.7.2/go.mod h1:kOvZKUdrhhFQmxLZqbwUV0rHkNkZpthMITIb2Ko1IoA=
+github.com/microsoft/go-mssqldb v1.8.0 h1:7cyZ/AT7ycDsEoWPIXibd+aVKFtteUNhDGf3aobP+tw=
+github.com/microsoft/go-mssqldb v1.8.0/go.mod h1:6znkekS3T2vp0waiMhen4GPU1BiAsrP+iXHcE7a7rFo=
 github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyuac5Z2hdY=
 github.com/mitchellh/mapstructure v1.5.0/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
 github.com/moby/term v0.0.0-20221120202655-abb19827d345 h1:J9c53/kxIH+2nTKBEfZYFMlhghtHpIHSXpm5VRGHSnU=

pkg/sqlcmd/sqlcmd.go

@@ -474,19 +474,19 @@ func (s *Sqlcmd) runQuery(query string) (int, error) {
 				first = true
 			}
 		case sqlexp.MsgNext:
+			if first {
+				first = false
+				cols, err = rows.ColumnTypes()
+				if err != nil {
+					retcode = -100
+					qe = s.handleError(&retcode, err)
+					s.Format.AddError(err)
+				} else {
+					s.Format.BeginResultSet(cols)
+				}
+			}
 			inresult := rows.Next()
 			for inresult {
-				if first {
-					first = false
-					cols, err = rows.ColumnTypes()
-					if err != nil {
-						retcode = -100
-						qe = s.handleError(&retcode, err)
-						s.Format.AddError(err)
-					} else {
-						s.Format.BeginResultSet(cols)
-					}
-				}
 				col1 := s.Format.AddRow(rows)
 				inresult = rows.Next()
 				if !inresult {

pkg/sqlcmd/sqlcmd_test.go

@@ -521,6 +521,17 @@ func TestQueryServerPropertyReturnsColumnName(t *testing.T) {
 	}
 }
 
+func TestHeadersPrintWhenThereAreZeroRows(t *testing.T) {
+	s, buf := setupSqlCmdWithMemoryOutput(t)
+	s.vars.Set(SQLCMDMAXVARTYPEWIDTH, "256")
+	s.vars.Set(SQLCMDCOLWIDTH, "4")
+	defer buf.Close()
+	err := runSqlCmd(t, s, []string{"select name from sys.databases where name like 'bogus'", "GO"})
+	if assert.NoError(t, err, "select should succeed") {
+		assert.Contains(t, buf.buf.String(), "name"+SqlcmdEol+"----"+SqlcmdEol, "Headers missing from output")
+	}
+}
+
 func TestSqlCmdOutputAndError(t *testing.T) {
 	s, outfile, errfile := setupSqlcmdWithFileErrorOutput(t)
 	defer os.Remove(outfile.Name())