我想从 Go 连接到 Memgraph 数据库的运行实例。我正在使用 Docker 并安装了 Memgraph 平台。我到底需要做什么？
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紫衣仙女
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从 Go 连接到 Memgraph 的过程相当简单。为此，您需要使用 Bolt 协议。以下是所需的步骤：
首先，为您的应用程序创建一个新目录，/MyApp并将您自己定位在其中。program.go接下来，使用以下代码创建一个文件：
package main
import (
"fmt"
"github.com/neo4j/neo4j-go-driver/v4/neo4j"
)
func main() {
dbUri := "bolt://localhost:7687"
driver, err := neo4j.NewDriver(dbUri, neo4j.BasicAuth("username", "password", ""))
if err != nil {
panic(err)
}
// Handle driver lifetime based on your application lifetime requirements driver's lifetime is usually
// bound by the application lifetime, which usually implies one driver instance per application
defer driver.Close()
item, err := insertItem(driver)
if err != nil {
panic(err)
}
fmt.Printf("%v\n", item.Message)
}
func insertItem(driver neo4j.Driver) (*Item, error) {
// Sessions are short-lived, cheap to create and NOT thread safe. Typically create one or more sessions
// per request in your web application. Make sure to call Close on the session when done.
// For multi-database support, set sessionConfig.DatabaseName to requested database
// Session config will default to write mode, if only reads are to be used configure session for
// read mode.
session := driver.NewSession(neo4j.SessionConfig{})
defer session.Close()
result, err := session.WriteTransaction(createItemFn)
if err != nil {
return nil, err
}
return result.(*Item), nil
}
func createItemFn(tx neo4j.Transaction) (interface{}, error) {
records, err := tx.Run(
"CREATE (a:Greeting) SET a.message = $message RETURN 'Node ' + id(a) + ': ' + a.message",
map[string]interface{}{"message": "Hello, World!"})
// In face of driver native errors, make sure to return them directly.
// Depending on the error, the driver may try to execute the function again.
if err != nil {
return nil, err
}
record, err := records.Single()
if err != nil {
return nil, err
}
// You can also retrieve values by name, with e.g. `id, found := record.Get("n.id")`
return &Item{
Message: record.Values[0].(string),
}, nil
}
type Item struct {
Message string
}
现在，go.mod使用go mod init example.com/hello命令创建一个文件。我之前提到过 Bolt 驱动器。您需要添加它go get github.com/neo4j/neo4j-go-driver/v4@v4.3.1。你可以运行你的程序go run .\program.go。
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