forked from opengaussexamples/examples
99 lines
2.2 KiB
Go
99 lines
2.2 KiB
Go
package main
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import (
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"context"
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"database/sql"
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"fmt"
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"gitee.com/chentanyang/ogx"
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"gitee.com/chentanyang/ogx/dialect/ogdialect"
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"gitee.com/chentanyang/ogx/extra/ogxdebug"
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_ "gitee.com/opengauss/openGauss-connector-go-pq"
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)
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// Profile belongs to User.
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type Profile struct {
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ID int64 `ogx:",pk,autoincrement"`
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Lang string
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UserID int64
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}
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type User struct {
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ID int64 `ogx:",pk,autoincrement"`
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Name string
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Profile *Profile `ogx:"rel:has-one,join:id=user_id"`
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}
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func main() {
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ctx := context.Background()
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connStr := "host=192.168.20.40 port=26000 user=cuih password=Gauss@123 dbname=test sslmode=disable"
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opengaussdb, err := sql.Open("opengauss", connStr)
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if err != nil {
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panic(err)
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}
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db := ogx.NewDB(opengaussdb, ogdialect.New())
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defer db.Close()
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db.AddQueryHook(ogxdebug.NewQueryHook(ogxdebug.WithVerbose(true)))
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if err := createSchema(ctx, db, (*User)(nil), (*Profile)(nil)); err != nil {
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panic(err)
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}
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defer func() {
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_ = dropSchema(ctx, db, (*User)(nil), (*Profile)(nil))
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}()
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var users []User
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if err := db.NewSelect().
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Model(&users).
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Column("user.*").
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Relation("Profile").
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Scan(ctx); err != nil {
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panic(err)
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}
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fmt.Println(len(users), "results")
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fmt.Println(users[0].ID, users[0].Name, users[0].Profile)
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fmt.Println(users[1].ID, users[1].Name, users[1].Profile)
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// Output: 2 results
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// 1 user 1 &{1 en 1}
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// 2 user 2 &{2 ru 2}
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}
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func createSchema(ctx context.Context, db *ogx.DB, models ...interface{}) error {
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for _, model := range models {
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if _, err := db.NewCreateTable().Model(model).Exec(ctx); err != nil {
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return err
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}
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}
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users := []*User{
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{ID: 1, Name: "user 1"},
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{ID: 2, Name: "user 2"},
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}
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if _, err := db.NewInsert().Model(&users).Exec(ctx); err != nil {
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return err
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}
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profiles := []*Profile{
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{ID: 1, Lang: "en", UserID: 1},
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{ID: 2, Lang: "ru", UserID: 2},
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}
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if _, err := db.NewInsert().Model(&profiles).Exec(ctx); err != nil {
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return err
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}
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return nil
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}
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func dropSchema(ctx context.Context, db *ogx.DB, models ...interface{}) error {
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for _, model := range models {
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if _, err := db.NewDropTable().Model(model).IfExists().Cascade().Exec(ctx); err != nil {
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return err
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}
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}
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return nil
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}
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