refactor: 重构neo4j服务
This commit is contained in:
@@ -1,716 +0,0 @@
|
||||
package service
|
||||
|
||||
import (
|
||||
"context"
|
||||
"fmt"
|
||||
"strings"
|
||||
|
||||
"github.com/neo4j/neo4j-go-driver/v5/neo4j"
|
||||
|
||||
"knowledge-graph-backend/internal/model"
|
||||
)
|
||||
|
||||
type Neo4jService struct {
|
||||
driver neo4j.DriverWithContext
|
||||
}
|
||||
|
||||
func NewNeo4jService(driver neo4j.DriverWithContext) *Neo4jService {
|
||||
return &Neo4jService{driver: driver}
|
||||
}
|
||||
|
||||
func (s *Neo4jService) GetGraphData() model.GraphData {
|
||||
ctx := context.Background()
|
||||
var nodes []model.Node
|
||||
var edges []model.Edge
|
||||
|
||||
nodeResult, err := neo4j.ExecuteQuery(ctx, s.driver,
|
||||
"MATCH (n) RETURN n",
|
||||
map[string]any{},
|
||||
neo4j.EagerResultTransformer,
|
||||
)
|
||||
if err != nil {
|
||||
fmt.Printf("Error querying nodes: %v\n", err)
|
||||
return model.GraphData{}
|
||||
}
|
||||
for _, record := range nodeResult.Records {
|
||||
if v, ok := record.Get("n"); ok {
|
||||
if n, ok := v.(neo4j.Node); ok {
|
||||
nodes = append(nodes, neo4jNodeToModel(n))
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
edgeResult, err := neo4j.ExecuteQuery(ctx, s.driver,
|
||||
"MATCH (a)-[r]->(b) RETURN a.id AS source, b.id AS target, r",
|
||||
map[string]any{},
|
||||
neo4j.EagerResultTransformer,
|
||||
)
|
||||
if err != nil {
|
||||
fmt.Printf("Error querying edges: %v\n", err)
|
||||
return model.GraphData{Nodes: nodes}
|
||||
}
|
||||
for _, record := range edgeResult.Records {
|
||||
source, _ := record.Get("source")
|
||||
target, _ := record.Get("target")
|
||||
v, _ := record.Get("r")
|
||||
if rel, ok := v.(neo4j.Relationship); ok {
|
||||
edge := neo4jRelToModel(rel)
|
||||
if s, ok := source.(string); ok {
|
||||
edge.Source = s
|
||||
}
|
||||
if t, ok := target.(string); ok {
|
||||
edge.Target = t
|
||||
}
|
||||
edges = append(edges, edge)
|
||||
}
|
||||
}
|
||||
|
||||
return model.GraphData{Nodes: nodes, Edges: edges}
|
||||
}
|
||||
|
||||
func (s *Neo4jService) GetNodeByID(id string) (model.Node, bool) {
|
||||
ctx := context.Background()
|
||||
result, err := neo4j.ExecuteQuery(ctx, s.driver,
|
||||
"MATCH (n {id: $id}) RETURN n",
|
||||
map[string]any{"id": id},
|
||||
neo4j.EagerResultTransformer,
|
||||
)
|
||||
if err != nil || len(result.Records) == 0 {
|
||||
return model.Node{}, false
|
||||
}
|
||||
v, _ := result.Records[0].Get("n")
|
||||
if n, ok := v.(neo4j.Node); ok {
|
||||
return neo4jNodeToModel(n), true
|
||||
}
|
||||
return model.Node{}, false
|
||||
}
|
||||
|
||||
func (s *Neo4jService) SearchNodes(query string) []model.Node {
|
||||
if query == "" {
|
||||
return []model.Node{}
|
||||
}
|
||||
ctx := context.Background()
|
||||
result, err := neo4j.ExecuteQuery(ctx, s.driver,
|
||||
`MATCH (n)
|
||||
WHERE toLower(n.label) CONTAINS toLower($query)
|
||||
OR toLower(n.id) CONTAINS toLower($query)
|
||||
OR (n.type IS NOT NULL AND toLower(n.type) CONTAINS toLower($query))
|
||||
RETURN n`,
|
||||
map[string]any{"query": query},
|
||||
neo4j.EagerResultTransformer,
|
||||
)
|
||||
if err != nil {
|
||||
return []model.Node{}
|
||||
}
|
||||
var nodes []model.Node
|
||||
for _, record := range result.Records {
|
||||
v, _ := record.Get("n")
|
||||
if n, ok := v.(neo4j.Node); ok {
|
||||
nodes = append(nodes, neo4jNodeToModel(n))
|
||||
}
|
||||
}
|
||||
return nodes
|
||||
}
|
||||
|
||||
func (s *Neo4jService) GetNeighbors(nodeID string) (model.NeighborResponse, bool) {
|
||||
ctx := context.Background()
|
||||
|
||||
_, exists := s.GetNodeByID(nodeID)
|
||||
if !exists {
|
||||
return model.NeighborResponse{}, false
|
||||
}
|
||||
|
||||
result, err := neo4j.ExecuteQuery(ctx, s.driver,
|
||||
`MATCH ({id: $id})-[r]-(m)
|
||||
RETURN m, r, startNode(r).id AS source, endNode(r).id AS target`,
|
||||
map[string]any{"id": nodeID},
|
||||
neo4j.EagerResultTransformer,
|
||||
)
|
||||
if err != nil {
|
||||
return model.NeighborResponse{Nodes: []model.Node{}, Edges: []model.Edge{}}, true
|
||||
}
|
||||
|
||||
neighborMap := make(map[string]model.Node)
|
||||
edgeMap := make(map[string]model.Edge)
|
||||
|
||||
for _, record := range result.Records {
|
||||
if v, ok := record.Get("m"); ok {
|
||||
if n, ok := v.(neo4j.Node); ok {
|
||||
modelNode := neo4jNodeToModel(n)
|
||||
neighborMap[modelNode.ID] = modelNode
|
||||
}
|
||||
}
|
||||
|
||||
if v, ok := record.Get("r"); ok {
|
||||
if rel, ok := v.(neo4j.Relationship); ok {
|
||||
edge := neo4jRelToModel(rel)
|
||||
if source, ok := record.Get("source"); ok {
|
||||
if s, ok := source.(string); ok {
|
||||
edge.Source = s
|
||||
}
|
||||
}
|
||||
if target, ok := record.Get("target"); ok {
|
||||
if t, ok := target.(string); ok {
|
||||
edge.Target = t
|
||||
}
|
||||
}
|
||||
edgeMap[edge.ID] = edge
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
var neighborNodes []model.Node
|
||||
for _, n := range neighborMap {
|
||||
neighborNodes = append(neighborNodes, n)
|
||||
}
|
||||
|
||||
var relatedEdges []model.Edge
|
||||
for _, e := range edgeMap {
|
||||
relatedEdges = append(relatedEdges, e)
|
||||
}
|
||||
|
||||
return model.NeighborResponse{
|
||||
Nodes: neighborNodes,
|
||||
Edges: relatedEdges,
|
||||
}, true
|
||||
}
|
||||
|
||||
func (s *Neo4jService) GetStats() map[string]int {
|
||||
ctx := context.Background()
|
||||
result, err := neo4j.ExecuteQuery(ctx, s.driver,
|
||||
`MATCH (n)
|
||||
RETURN count(n) AS totalNodes,
|
||||
sum(CASE WHEN n.type = '概念' THEN 1 ELSE 0 END) AS conceptNodes,
|
||||
sum(CASE WHEN n.type = '工具' THEN 1 ELSE 0 END) AS toolNodes,
|
||||
sum(CASE WHEN n.type = '应用' THEN 1 ELSE 0 END) AS applicationNodes`,
|
||||
map[string]any{},
|
||||
neo4j.EagerResultTransformer,
|
||||
)
|
||||
if err != nil || len(result.Records) == 0 {
|
||||
return map[string]int{}
|
||||
}
|
||||
|
||||
record := result.Records[0]
|
||||
totalNodes := getInt(record, "totalNodes")
|
||||
conceptNodes := getInt(record, "conceptNodes")
|
||||
toolNodes := getInt(record, "toolNodes")
|
||||
applicationNodes := getInt(record, "applicationNodes")
|
||||
|
||||
totalEdges := 0
|
||||
edgeResult, err := neo4j.ExecuteQuery(ctx, s.driver,
|
||||
"MATCH ()-[r]->() RETURN count(r) AS totalEdges",
|
||||
map[string]any{},
|
||||
neo4j.EagerResultTransformer,
|
||||
)
|
||||
if err == nil && len(edgeResult.Records) > 0 {
|
||||
totalEdges = getInt(edgeResult.Records[0], "totalEdges")
|
||||
}
|
||||
|
||||
return map[string]int{
|
||||
"totalNodes": totalNodes,
|
||||
"totalEdges": totalEdges,
|
||||
"conceptNodes": conceptNodes,
|
||||
"toolNodes": toolNodes,
|
||||
"applicationNodes": applicationNodes,
|
||||
}
|
||||
}
|
||||
|
||||
// GetSimpleGraphData 获取简化的图数据，仅保留核心信息，适合 LLM 处理
|
||||
func (s *Neo4jService) GetSimpleGraphData() model.SimpleGraphData {
|
||||
ctx := context.Background()
|
||||
var nodes []model.SimpleNode
|
||||
var edges []model.SimpleEdge
|
||||
|
||||
nodeResult, err := neo4j.ExecuteQuery(ctx, s.driver,
|
||||
"MATCH (n) RETURN n",
|
||||
map[string]any{},
|
||||
neo4j.EagerResultTransformer,
|
||||
)
|
||||
if err != nil {
|
||||
fmt.Printf("Error querying nodes: %v\n", err)
|
||||
return model.SimpleGraphData{}
|
||||
}
|
||||
for _, record := range nodeResult.Records {
|
||||
if v, ok := record.Get("n"); ok {
|
||||
if n, ok := v.(neo4j.Node); ok {
|
||||
props := n.Props
|
||||
node := model.SimpleNode{
|
||||
ID: getStr(props, "id"),
|
||||
Label: getStr(props, "label"),
|
||||
Type: getStr(props, "type"),
|
||||
}
|
||||
nodes = append(nodes, node)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
edgeResult, err := neo4j.ExecuteQuery(ctx, s.driver,
|
||||
"MATCH (a)-[r]->(b) RETURN a.id AS source, b.id AS target, r",
|
||||
map[string]any{},
|
||||
neo4j.EagerResultTransformer,
|
||||
)
|
||||
if err != nil {
|
||||
fmt.Printf("Error querying edges: %v\n", err)
|
||||
return model.SimpleGraphData{Nodes: nodes}
|
||||
}
|
||||
for _, record := range edgeResult.Records {
|
||||
source, _ := record.Get("source")
|
||||
target, _ := record.Get("target")
|
||||
v, _ := record.Get("r")
|
||||
if rel, ok := v.(neo4j.Relationship); ok {
|
||||
props := rel.Props
|
||||
edge := model.SimpleEdge{
|
||||
Source: getStr(props, "source"),
|
||||
Target: getStr(props, "target"),
|
||||
Type: rel.Type,
|
||||
Label: getStr(props, "label"),
|
||||
}
|
||||
if s, ok := source.(string); ok {
|
||||
edge.Source = s
|
||||
}
|
||||
if t, ok := target.(string); ok {
|
||||
edge.Target = t
|
||||
}
|
||||
edges = append(edges, edge)
|
||||
}
|
||||
}
|
||||
|
||||
return model.SimpleGraphData{Nodes: nodes, Edges: edges}
|
||||
}
|
||||
|
||||
func neo4jNodeToModel(n neo4j.Node) model.Node {
|
||||
props := n.Props
|
||||
node := model.Node{
|
||||
ID: getStr(props, "id"),
|
||||
Label: getStr(props, "label"),
|
||||
Type: getStr(props, "type"),
|
||||
Properties: make(map[string]interface{}),
|
||||
}
|
||||
if v, ok := props["x"]; ok && v != nil {
|
||||
node.X = getFloat64(v)
|
||||
}
|
||||
if v, ok := props["y"]; ok && v != nil {
|
||||
node.Y = getFloat64(v)
|
||||
}
|
||||
if v, ok := props["style"]; ok && v != nil {
|
||||
if s, ok := v.(map[string]interface{}); ok {
|
||||
node.Style = s
|
||||
}
|
||||
}
|
||||
for k, v := range props {
|
||||
switch k {
|
||||
case "id", "label", "type", "x", "y", "style":
|
||||
default:
|
||||
node.Properties[k] = v
|
||||
}
|
||||
}
|
||||
return node
|
||||
}
|
||||
|
||||
func neo4jRelToModel(r neo4j.Relationship) model.Edge {
|
||||
props := r.Props
|
||||
edge := model.Edge{
|
||||
ID: getStr(props, "id"),
|
||||
Label: getStr(props, "label"),
|
||||
Type: r.Type,
|
||||
Properties: make(map[string]interface{}),
|
||||
}
|
||||
if v, ok := props["style"]; ok && v != nil {
|
||||
if s, ok := v.(map[string]interface{}); ok {
|
||||
edge.Style = s
|
||||
}
|
||||
}
|
||||
for k, v := range props {
|
||||
switch k {
|
||||
case "id", "label", "style":
|
||||
default:
|
||||
edge.Properties[k] = v
|
||||
}
|
||||
}
|
||||
return edge
|
||||
}
|
||||
|
||||
func getStr(props map[string]any, key string) string {
|
||||
if v, ok := props[key]; ok && v != nil {
|
||||
if s, ok := v.(string); ok {
|
||||
return s
|
||||
}
|
||||
}
|
||||
return ""
|
||||
}
|
||||
|
||||
func getFloat64(v any) float64 {
|
||||
switch val := v.(type) {
|
||||
case float64:
|
||||
return val
|
||||
case int64:
|
||||
return float64(val)
|
||||
case int:
|
||||
return float64(val)
|
||||
}
|
||||
return 0
|
||||
}
|
||||
|
||||
func getInt(record *neo4j.Record, key string) int {
|
||||
v, _ := record.Get(key)
|
||||
switch val := v.(type) {
|
||||
case int64:
|
||||
return int(val)
|
||||
case int:
|
||||
return val
|
||||
case float64:
|
||||
return int(val)
|
||||
}
|
||||
return 0
|
||||
}
|
||||
|
||||
// CreateNode 创建新节点
|
||||
func (s *Neo4jService) CreateNode(req model.CreateNodeRequest) (model.Node, error) {
|
||||
ctx := context.Background()
|
||||
|
||||
// 检查节点是否已存在
|
||||
checkQuery := "MATCH (n {id: $id}) RETURN n"
|
||||
checkResult, err := neo4j.ExecuteQuery(ctx, s.driver, checkQuery,
|
||||
map[string]any{"id": req.ID}, neo4j.EagerResultTransformer)
|
||||
if err != nil {
|
||||
return model.Node{}, fmt.Errorf("error checking node existence: %w", err)
|
||||
}
|
||||
if len(checkResult.Records) > 0 {
|
||||
return model.Node{}, fmt.Errorf("node with id %s already exists", req.ID)
|
||||
}
|
||||
|
||||
// 构建创建属性
|
||||
props := map[string]any{
|
||||
"id": req.ID,
|
||||
"label": req.Label,
|
||||
}
|
||||
|
||||
if req.Type != "" {
|
||||
props["type"] = req.Type
|
||||
}
|
||||
if req.X != 0 {
|
||||
props["x"] = req.X
|
||||
}
|
||||
if req.Y != 0 {
|
||||
props["y"] = req.Y
|
||||
}
|
||||
|
||||
// 合并自定义属性（避免覆盖系统属性）
|
||||
if req.Properties != nil {
|
||||
for k, v := range req.Properties {
|
||||
if k != "id" && k != "label" && k != "type" && k != "x" && k != "y" {
|
||||
props[k] = v
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// 执行创建
|
||||
nodeType := "Node"
|
||||
if req.Type != "" {
|
||||
nodeType = req.Type
|
||||
}
|
||||
|
||||
query := fmt.Sprintf(`
|
||||
CREATE (n:%s)
|
||||
SET n = $props
|
||||
RETURN n`, nodeType)
|
||||
|
||||
result, err := neo4j.ExecuteQuery(ctx, s.driver, query,
|
||||
map[string]any{"props": props}, neo4j.EagerResultTransformer)
|
||||
if err != nil {
|
||||
fmt.Printf("Error creating node: %v\n", err)
|
||||
return model.Node{}, fmt.Errorf("failed to create node: %w", err)
|
||||
}
|
||||
|
||||
if len(result.Records) == 0 {
|
||||
return model.Node{}, fmt.Errorf("failed to create node: no result returned")
|
||||
}
|
||||
|
||||
v, _ := result.Records[0].Get("n")
|
||||
if n, ok := v.(neo4j.Node); ok {
|
||||
return neo4jNodeToModel(n), nil
|
||||
}
|
||||
|
||||
return model.Node{}, fmt.Errorf("unexpected result type while creating node")
|
||||
}
|
||||
|
||||
// CreateNodeV2 创建新节点（改进版）
|
||||
func (s *Neo4jService) CreateNodeV2(req model.CreateNodeRequest) (model.Node, error) {
|
||||
ctx := context.Background()
|
||||
|
||||
// 先检查节点是否已存在
|
||||
checkQuery := "MATCH (n {id: $id}) RETURN n"
|
||||
checkResult, err := neo4j.ExecuteQuery(ctx, s.driver, checkQuery,
|
||||
map[string]any{"id": req.ID}, neo4j.EagerResultTransformer)
|
||||
if err != nil {
|
||||
return model.Node{}, err
|
||||
}
|
||||
if len(checkResult.Records) > 0 {
|
||||
return model.Node{}, fmt.Errorf("node with id %s already exists", req.ID)
|
||||
}
|
||||
|
||||
// 构建创建属性
|
||||
props := map[string]any{
|
||||
"id": req.ID,
|
||||
"label": req.Label,
|
||||
}
|
||||
|
||||
if req.Type != "" {
|
||||
props["type"] = req.Type
|
||||
}
|
||||
if req.X != 0 {
|
||||
props["x"] = req.X
|
||||
}
|
||||
if req.Y != 0 {
|
||||
props["y"] = req.Y
|
||||
}
|
||||
|
||||
// 合并自定义属性（避免覆盖系统属性）
|
||||
if req.Properties != nil {
|
||||
for k, v := range req.Properties {
|
||||
if k != "id" && k != "label" && k != "type" && k != "x" && k != "y" {
|
||||
props[k] = v
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// 执行创建
|
||||
nodeType := "Node"
|
||||
if req.Type != "" {
|
||||
nodeType = req.Type
|
||||
}
|
||||
|
||||
query := fmt.Sprintf(`
|
||||
CREATE (n:%s)
|
||||
SET n = $props
|
||||
RETURN n`, nodeType)
|
||||
|
||||
result, err := neo4j.ExecuteQuery(ctx, s.driver, query,
|
||||
map[string]any{"props": props}, neo4j.EagerResultTransformer)
|
||||
if err != nil {
|
||||
fmt.Printf("Error creating node: %v\n", err)
|
||||
return model.Node{}, err
|
||||
}
|
||||
|
||||
if len(result.Records) == 0 {
|
||||
return model.Node{}, fmt.Errorf("failed to create node")
|
||||
}
|
||||
|
||||
v, _ := result.Records[0].Get("n")
|
||||
if n, ok := v.(neo4j.Node); ok {
|
||||
return neo4jNodeToModel(n), nil
|
||||
}
|
||||
|
||||
return model.Node{}, fmt.Errorf("unexpected result type while creating node")
|
||||
}
|
||||
|
||||
// UpdateNode 更新节点
|
||||
func (s *Neo4jService) UpdateNode(id string, req model.UpdateNodeRequest) (model.Node, error) {
|
||||
ctx := context.Background()
|
||||
|
||||
// 检查节点是否存在
|
||||
_, exists := s.GetNodeByID(id)
|
||||
if !exists {
|
||||
return model.Node{}, fmt.Errorf("node with id %s not found", id)
|
||||
}
|
||||
|
||||
// 构建更新语句
|
||||
setClauses := []string{}
|
||||
params := map[string]any{"id": id}
|
||||
|
||||
if req.Label != "" {
|
||||
setClauses = append(setClauses, "n.label = $label")
|
||||
params["label"] = req.Label
|
||||
}
|
||||
|
||||
if req.Type != "" {
|
||||
setClauses = append(setClauses, "n.type = $type")
|
||||
params["type"] = req.Type
|
||||
}
|
||||
|
||||
if req.X != nil {
|
||||
setClauses = append(setClauses, "n.x = $x")
|
||||
params["x"] = *req.X
|
||||
}
|
||||
if req.Y != nil {
|
||||
setClauses = append(setClauses, "n.y = $y")
|
||||
params["y"] = *req.Y
|
||||
}
|
||||
|
||||
query := `MATCH (n {id: $id})`
|
||||
|
||||
// 处理自定义属性（不管是否有标准字段更新）
|
||||
if len(req.Properties) > 0 {
|
||||
for key, value := range req.Properties {
|
||||
// 跳过系统属性，避免冲突
|
||||
if key != "id" && key != "label" && key != "type" && key != "x" && key != "y" {
|
||||
setClauses = append(setClauses, fmt.Sprintf("n.%s = $%s", key, key))
|
||||
params[key] = value
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if len(setClauses) > 0 {
|
||||
query += ` SET ` + fmt.Sprintf("%s", strings.Join(setClauses, ", "))
|
||||
}
|
||||
query += ` RETURN n`
|
||||
|
||||
result, err := neo4j.ExecuteQuery(ctx, s.driver, query, params, neo4j.EagerResultTransformer)
|
||||
if err != nil {
|
||||
fmt.Printf("Error updating node: %v\n", err)
|
||||
return model.Node{}, err
|
||||
}
|
||||
|
||||
if len(result.Records) == 0 {
|
||||
return model.Node{}, fmt.Errorf("failed to update node")
|
||||
}
|
||||
|
||||
v, _ := result.Records[0].Get("n")
|
||||
if n, ok := v.(neo4j.Node); ok {
|
||||
return neo4jNodeToModel(n), nil
|
||||
}
|
||||
|
||||
return model.Node{}, fmt.Errorf("unexpected result type while updating node")
|
||||
}
|
||||
|
||||
// DeleteNode 删除节点
|
||||
func (s *Neo4jService) DeleteNode(id string) error {
|
||||
ctx := context.Background()
|
||||
|
||||
// 检查节点是否存在
|
||||
_, exists := s.GetNodeByID(id)
|
||||
if !exists {
|
||||
return fmt.Errorf("node with id %s not found", id)
|
||||
}
|
||||
|
||||
// 先删除与该节点相关的所有关系
|
||||
deleteRelationsQuery := `
|
||||
MATCH (n {id: $id})-[r]-(m)
|
||||
DELETE r`
|
||||
|
||||
_, err := neo4j.ExecuteQuery(ctx, s.driver, deleteRelationsQuery,
|
||||
map[string]any{"id": id}, neo4j.EagerResultTransformer)
|
||||
if err != nil {
|
||||
fmt.Printf("Error deleting relations: %v\n", err)
|
||||
// 继续尝试删除节点
|
||||
}
|
||||
|
||||
// 删除节点
|
||||
deleteNodeQuery := `
|
||||
MATCH (n {id: $id})
|
||||
DELETE n`
|
||||
|
||||
_, err = neo4j.ExecuteQuery(ctx, s.driver, deleteNodeQuery,
|
||||
map[string]any{"id": id}, neo4j.EagerResultTransformer)
|
||||
if err != nil {
|
||||
fmt.Printf("Error deleting node: %v\n", err)
|
||||
return err
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// CreateEdge 创建新边
|
||||
func (s *Neo4jService) CreateEdge(req model.CreateEdgeRequest) (model.Edge, error) {
|
||||
ctx := context.Background()
|
||||
|
||||
// 检查源节点和目标节点是否存在
|
||||
_, sourceExists := s.GetNodeByID(req.Source)
|
||||
if !sourceExists {
|
||||
return model.Edge{}, fmt.Errorf("source node with id %s not found", req.Source)
|
||||
}
|
||||
_, targetExists := s.GetNodeByID(req.Target)
|
||||
if !targetExists {
|
||||
return model.Edge{}, fmt.Errorf("target node with id %s not found", req.Target)
|
||||
}
|
||||
|
||||
// 构建创建属性
|
||||
|
||||
// 构建创建属性
|
||||
props := map[string]any{
|
||||
"id": req.ID,
|
||||
"label": req.Label,
|
||||
}
|
||||
|
||||
// 合并自定义属性
|
||||
if req.Properties != nil {
|
||||
for k, v := range req.Properties {
|
||||
if k != "id" && k != "label" {
|
||||
props[k] = v
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// 确定边类型
|
||||
relationType := "RELATED_TO"
|
||||
if req.Type != "" {
|
||||
relationType = strings.ToUpper(req.Type)
|
||||
}
|
||||
|
||||
// 执行创建
|
||||
query := fmt.Sprintf(`
|
||||
MATCH (a {id: $source}), (b {id: $target})
|
||||
CREATE (a)-[r:%s]->(b)
|
||||
SET r = $props
|
||||
RETURN r`, relationType)
|
||||
|
||||
params := map[string]any{
|
||||
"source": req.Source,
|
||||
"target": req.Target,
|
||||
"props": props,
|
||||
}
|
||||
|
||||
result, err := neo4j.ExecuteQuery(ctx, s.driver, query, params, neo4j.EagerResultTransformer)
|
||||
if err != nil {
|
||||
fmt.Printf("Error creating edge: %v\n", err)
|
||||
return model.Edge{}, err
|
||||
}
|
||||
|
||||
if len(result.Records) == 0 {
|
||||
return model.Edge{}, fmt.Errorf("failed to create edge")
|
||||
}
|
||||
|
||||
v, _ := result.Records[0].Get("r")
|
||||
if r, ok := v.(neo4j.Relationship); ok {
|
||||
edge := neo4jRelToModel(r)
|
||||
edge.Source = req.Source
|
||||
edge.Target = req.Target
|
||||
return edge, nil
|
||||
}
|
||||
|
||||
return model.Edge{}, fmt.Errorf("unexpected result type while creating edge")
|
||||
}
|
||||
|
||||
// DeleteEdge 删除边
|
||||
func (s *Neo4jService) DeleteEdge(edgeID string) error {
|
||||
ctx := context.Background()
|
||||
|
||||
// 检查边是否存在
|
||||
checkQuery := `
|
||||
MATCH ()-[r]-()
|
||||
WHERE r.id = $id
|
||||
RETURN r`
|
||||
checkResult, err := neo4j.ExecuteQuery(ctx, s.driver, checkQuery,
|
||||
map[string]any{"id": edgeID}, neo4j.EagerResultTransformer)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if len(checkResult.Records) == 0 {
|
||||
return fmt.Errorf("edge with id %s not found", edgeID)
|
||||
}
|
||||
|
||||
// 删除边
|
||||
deleteQuery := `
|
||||
MATCH ()-[r]-()
|
||||
WHERE r.id = $id
|
||||
DELETE r`
|
||||
|
||||
_, err = neo4j.ExecuteQuery(ctx, s.driver, deleteQuery,
|
||||
map[string]any{"id": edgeID}, neo4j.EagerResultTransformer)
|
||||
if err != nil {
|
||||
fmt.Printf("Error deleting edge: %v\n", err)
|
||||
return err
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
Reference in New Issue
Block a user