| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package main |
| |
| import ( |
| "database/sql" |
| "fmt" |
| |
| "github.com/apache/age/drivers/golang/age" |
| ) |
| |
| // Do cypher query to AGE with database/sql Tx API transaction control |
| func doWithSqlAPI(dsn string, graphName string) { |
| |
| // Connect to PostgreSQL |
| db, err := sql.Open("postgres", dsn) |
| if err != nil { |
| panic(err) |
| } |
| |
| // Confirm graph_path created |
| _, err = age.GetReady(db, graphName) |
| if err != nil { |
| panic(err) |
| } |
| |
| // Tx begin for execute create vertex |
| tx, err := db.Begin() |
| if err != nil { |
| panic(err) |
| } |
| |
| // Create vertices with Cypher |
| _, err = age.ExecCypher(tx, graphName, 0, "CREATE (n:Person {name: '%s', weight:%f})", "Joe", 67.3) |
| if err != nil { |
| panic(err) |
| } |
| |
| _, err = age.ExecCypher(tx, graphName, 0, "CREATE (n:Person {name: '%s', weight:77.3, roles:['Dev','marketing']})", "Jack") |
| if err != nil { |
| panic(err) |
| } |
| |
| _, err = age.ExecCypher(tx, graphName, 0, "CREATE (n:Person {name: '%s', weight:%d})", "Andy", 59) |
| if err != nil { |
| panic(err) |
| } |
| |
| // Commit Tx |
| tx.Commit() |
| |
| // Tx begin for queries |
| tx, err = db.Begin() |
| if err != nil { |
| panic(err) |
| } |
| // Query cypher |
| cypherCursor, err := age.ExecCypher(tx, graphName, 1, "MATCH (n:Person) RETURN n") |
| if err != nil { |
| panic(err) |
| } |
| // Unmarshal result data to Vertex row by row |
| for cypherCursor.Next() { |
| row, err := cypherCursor.GetRow() |
| if err != nil { |
| panic(err) |
| } |
| vertex := row[0].(*age.Vertex) |
| fmt.Println(vertex.Id(), vertex.Label(), vertex.Props()) |
| } |
| |
| // Create Paths (Edges) |
| _, err = age.ExecCypher(tx, graphName, 0, "MATCH (a:Person), (b:Person) WHERE a.name='%s' AND b.name='%s' CREATE (a)-[r:workWith {weight: %d}]->(b)", "Jack", "Joe", 3) |
| if err != nil { |
| panic(err) |
| } |
| |
| _, err = age.ExecCypher(tx, graphName, 0, "MATCH (a:Person {name: '%s'}), (b:Person {name: '%s'}) CREATE (a)-[r:workWith {weight: %d}]->(b)", "Joe", "Andy", 7) |
| if err != nil { |
| panic(err) |
| } |
| |
| tx.Commit() |
| |
| tx, err = db.Begin() |
| if err != nil { |
| panic(err) |
| } |
| // Query Paths with Cypher |
| cypherCursor, err = age.ExecCypher(tx, graphName, 1, "MATCH p=()-[:workWith]-() RETURN p") |
| if err != nil { |
| panic(err) |
| } |
| |
| for cypherCursor.Next() { |
| row, err := cypherCursor.GetRow() |
| if err != nil { |
| panic(err) |
| } |
| |
| path := row[0].(*age.Path) |
| vertexStart := path.GetAsVertex(0) |
| edge := path.GetAsEdge(1) |
| vertexEnd := path.GetAsVertex(2) |
| |
| fmt.Println(vertexStart, edge, vertexEnd) |
| } |
| |
| // Query with return many columns |
| cursor, err := age.ExecCypher(tx, graphName, 3, "MATCH (a:Person)-[l:workWith]-(b:Person) RETURN a, l, b") |
| if err != nil { |
| panic(err) |
| } |
| |
| count := 0 |
| for cursor.Next() { |
| row, err := cursor.GetRow() |
| if err != nil { |
| panic(err) |
| } |
| count++ |
| v1 := row[0].(*age.Vertex) |
| edge := row[1].(*age.Edge) |
| v2 := row[2].(*age.Vertex) |
| fmt.Println("ROW ", count, ">>", "\n\t", v1, "\n\t", edge, "\n\t", v2) |
| } |
| |
| // Delete Vertices |
| _, err = age.ExecCypher(tx, graphName, 0, "MATCH (n:Person) DETACH DELETE n RETURN *") |
| if err != nil { |
| panic(err) |
| } |
| tx.Commit() |
| } |