Go: gorm で MariaDB のデータを作成 (Create)

プログラム

フォルダー構造

$ tree -a
.
├── .env
├── config_mariadb.go
├── go.mod
├── go.sum
└── gorm_create.go

gorm_create.go

// ----------------------------------------------------------------
//
//	gorm_create.go
//
//					Feb/27/2023
//
// ----------------------------------------------------------------
package main

import (
	"fmt"
	"os"
	"gorm.io/gorm"
	"gorm.io/driver/mysql"
)

// ----------------------------------------------------------------
func unit_gen_proc (name string,population int,date_mod string) map[string]interface{} {
	unit_aa := make (map[string]interface{})
	unit_aa["name"] = name
	unit_aa["population"] = population
	unit_aa["date_mod"] = date_mod

	return (unit_aa)
}

// ----------------------------------------------------------------
func data_prepare_proc () map[string](map[string]interface{}) {
	dict_aa := make (map[string](map[string]interface{}))

	dict_aa["t3321"] = unit_gen_proc ("岡山",897152,"1921-11-12")
	dict_aa["t3322"] = unit_gen_proc ("倉敷",429671,"1921-5-21")
	dict_aa["t3323"] = unit_gen_proc ("津山",621597,"1921-6-14")
	dict_aa["t3324"] = unit_gen_proc ("玉野",952178,"1921-4-30")
	dict_aa["t3325"] = unit_gen_proc ("笠岡",417859,"1921-6-24")
	dict_aa["t3326"] = unit_gen_proc ("井原",213592,"1921-1-10")
	dict_aa["t3327"] = unit_gen_proc ("総社",482967,"1921-10-19")
	dict_aa["t3328"] = unit_gen_proc ("高梁",785231,"1921-12-28")
	dict_aa["t3329"] = unit_gen_proc ("新見",259718,"1921-5-12")

	return (dict_aa)
}

// ----------------------------------------------------------------
func main() {
	fmt.Fprintln (os.Stderr,"*** 開始 ***")

	dict_aa := data_prepare_proc ()

	host,user,password,data_base := config_mariadb_proc()

	dsn := user + ":" + password + "@tcp(" + host + ":3306)/" + data_base + "?charset=utf8mb4&parseTime=True&loc=Local"
	db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{})
		if err != nil {
		panic(err)
	}

	db.Exec ("drop table cities")

	sql_str := "create table cities (id varchar(10),name varchar(20),population int,date_mod date)"
	fmt.Println (sql_str)

	db.Exec (sql_str)

	for key,_ := range dict_aa {
		name := dict_aa[key]["name"]
		population := dict_aa[key]["population"]
		date_mod := dict_aa[key]["date_mod"]
		sql_str :="insert into cities (id,name,population,date_mod) values (?,?,?,?)"
		db.Exec (sql_str,key,name,population,date_mod)
		}

	fmt.Fprintln (os.Stderr,"*** 終了 ***")
}

// ----------------------------------------------------------------

.env
config_mariadb.go
はこちら
Go: gorm で MariaDB のバージョンを表示

実行の準備

go mod init create
go mod tidy

実行

go run gorm_create.go config_mariadb.go

確認したバージョン

$ go version
go version go1.20.1 linux/amd64

関連ページ

Go: gorm で MariaDB のデータを読む (Read)
Go: gorm で MariaDB のデータを更新 (Update)
Go: gorm で MariaDB のデータを削除 (Delete)