Add Scan for ResultSet

go.mod

@@ -1,9 +1,18 @@
 module github.com/vesoft-inc/nebula-go/v3
 
-go 1.16
+go 1.18
 
 require (
+	github.com/samber/lo v1.39.0
 	github.com/stretchr/testify v1.7.0
 	github.com/vesoft-inc/fbthrift v0.0.0-20230214024353-fa2f34755b28
 	golang.org/x/net v0.17.0
 )
+
+require (
+	github.com/davecgh/go-spew v1.1.0 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	golang.org/x/exp v0.0.0-20220303212507-bbda1eaf7a17 // indirect
+	golang.org/x/text v0.13.0 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
+)

go.sum

@@ -2,52 +2,19 @@ github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/samber/lo v1.39.0 h1:4gTz1wUhNYLhFSKl6O+8peW0v2F4BCY034GRpU9WnuA=
+github.com/samber/lo v1.39.0/go.mod h1:+m/ZKRl6ClXCE2Lgf3MsQlWfh4bn1bz6CXEOxnEXnEA=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/vesoft-inc/fbthrift v0.0.0-20230214024353-fa2f34755b28 h1:gpoPCGeOEuk/TnoY9nLVK1FoBM5ie7zY3BPVG8q43ME=
 github.com/vesoft-inc/fbthrift v0.0.0-20230214024353-fa2f34755b28/go.mod h1:xu7e9za8StcJhBZmCDwK1Hyv4/Y0xFsjS+uqp10ECJg=
-github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
-golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
-golang.org/x/crypto v0.14.0/go.mod h1:MVFd36DqK4CsrnJYDkBA3VC4m2GkXAM0PvzMCn4JQf4=
-golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
-golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
-golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
-golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
-golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
-golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
+golang.org/x/exp v0.0.0-20220303212507-bbda1eaf7a17 h1:3MTrJm4PyNL9NBqvYDSj3DHl46qQakyfqfWo4jgfaEM=
+golang.org/x/exp v0.0.0-20220303212507-bbda1eaf7a17/go.mod h1:lgLbSvA5ygNOMpwM/9anMpWVlVJ7Z+cHWq/eFuinpGE=
 golang.org/x/net v0.17.0 h1:pVaXccu2ozPjCXewfr1S7xza/zcXTity9cCdXQYSjIM=
 golang.org/x/net v0.17.0/go.mod h1:NxSsAGuq816PNPmqtQdLE42eU2Fs7NoRIZrHJAlaCOE=
-golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
-golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
-golang.org/x/term v0.8.0/go.mod h1:xPskH00ivmX89bAKVGSKKtLOWNx2+17Eiy94tnKShWo=
-golang.org/x/term v0.13.0/go.mod h1:LTmsnFJwVN6bCy1rVCoS+qHT1HhALEFxKncY3WNNh4U=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
-golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
-golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
 golang.org/x/text v0.13.0 h1:ablQoSUd0tRdKxZewP80B+BaqeKJuVhuRxj/dkrun3k=
 golang.org/x/text v0.13.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
-golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
-golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
-golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
-golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=

result_set.go

@@ -11,12 +11,15 @@ package nebula_go
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
+	"reflect"
 	"regexp"
 	"sort"
 	"strings"
 	"time"
 
+	"github.com/samber/lo"
 	"github.com/vesoft-inc/nebula-go/v3/nebula"
 	"github.com/vesoft-inc/nebula-go/v3/nebula/graph"
 )
@@ -295,6 +298,78 @@ func (res ResultSet) GetRowValuesByIndex(index int) (*Record, error) {
 	}, nil
 }
 
+// Scan scans the rows into the given value.
+func (res ResultSet) Scan(v any) error {
+	size := res.GetRowSize()
+	if size == 0 {
+		return nil
+	}
+
+	rv := reflect.ValueOf(v)
+	switch {
+	case rv.Kind() != reflect.Ptr:
+		if t := reflect.TypeOf(v); t != nil {
+			return fmt.Errorf("scan: Scan(non-pointer %s)", t)
+		}
+		fallthrough
+	case rv.IsNil():
+		return fmt.Errorf("scan: Scan(nil)")
+	}
+	rv = reflect.Indirect(rv)
+	if k := rv.Kind(); k != reflect.Slice {
+		return fmt.Errorf("scan: invalid type %s. expected slice as an argument", k)
+	}
+
+	colNames := res.GetColNames()
+	rows := res.GetRows()
+
+	t := reflect.TypeOf(v).Elem().Elem()
+	for _, row := range rows {
+		vv, err := res.scanRow(row, colNames, t)
+		if err != nil {
+			return err
+		}
+		rv.Set(reflect.Append(rv, vv))
+	}
+
+	return nil
+}
+
+// Scan scans the rows into the given value.
+func (res ResultSet) scanRow(row *nebula.Row, colNames []string, t reflect.Type) (reflect.Value, error) {
+	rowValues := row.GetValues()
+
+	val := reflect.New(t).Elem()
+
+	for i := 0; i < t.NumField(); i++ {
+		f := t.Field(i)
+		tag := f.Tag.Get("nebula")
+
+		if tag == "" {
+			continue
+		}
+
+		i := lo.IndexOf(colNames, tag)
+		if i == -1 {
+			// It is possible that the tag is not in the result set
+			continue
+		}
+
+		rowVal := rowValues[i]
+
+		switch f.Type.Kind() {
+		case reflect.Int64:
+			val.Field(i).SetInt(rowVal.GetIVal())
+		case reflect.String:
+			val.Field(i).SetString(string(rowVal.GetSVal()))
+		default:
+			return val, errors.New("scan: not support type")
+		}
+	}
+
+	return val, nil
+}
+
 // Returns the number of total rows
 func (res ResultSet) GetRowSize() int {
 	if res.resp.Data == nil {

result_set_test.go

@@ -711,6 +711,38 @@ func TestAsStringTable(t *testing.T) {
 	}
 }
 
+func TestScan(t *testing.T) {
+	resp := &graph.ExecutionResponse{
+		nebula.ErrorCode_SUCCEEDED,
+		1000,
+		getDateset(),
+		[]byte("test_space"),
+		[]byte("test"),
+		graph.NewPlanDescription(),
+		[]byte("test_comment")}
+	resultSet, err := genResultSet(resp, testTimezone)
+	if err != nil {
+		t.Error(err)
+	}
+
+	type testStruct struct {
+		Col0 int64  `nebula:"col0_int"`
+		Col1 string `nebula:"col1_string"`
+		// Col2 Node `nebula:"col2_vertex"`
+		// Col3 Relationship `nebula:"col3_edge"`
+		// Col4 PathWrapper `nebula:"col4_path"`
+	}
+
+	var testStructList []testStruct
+	err = resultSet.Scan(&testStructList)
+	if err != nil {
+		t.Error(err)
+	}
+	assert.Equal(t, 1, len(testStructList))
+	assert.Equal(t, int64(1), testStructList[0].Col0)
+	assert.Equal(t, "value1", testStructList[0].Col1)
+}
+
 func TestIntVid(t *testing.T) {
 	vertex := getVertexInt(101, 3, 5)
 	node, err := genNode(vertex, testTimezone)