[Feat]: Add a demo of golang gorm

golang/gorm/README-CN.md

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+# Golang 连接 OceanBase 指南（使用 go-sql-driver/mysql）
+
+[English](README.md) | 简体中文
+
+本文介绍如何通过 `gorm.io/driver/mysql` 连接 OceanBase 数据库。
+
+关于 `gorm.io/driver/mysql` 的详细信息，您可参考 [gorm.io/driver/mysql](https://gorm.io/driver/mysql)。
+
+## 快速开始
+
+您需要使用 `conf` 来创建数据库连接，详细信息请参考 [gorm.io/docs/](https://gorm.io/docs)。
+
+以 [example.go](example.go) 代码为例
+
+
+修改代码中的连接信息，之后你就可以直接使用 run.sh 运行示例代码。
+
+```bash
+sh run.sh
+```
+
+### 使用 PreparedStatement
+
+使用 root 用户登录 OceanBase，运行如下命令：
+
+```bash
+alter system set _ob_enable_prepared_statement = true;
+```

golang/gorm/README.md

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+# Connect OceanBase with Golang (gorm.io/driver/mysql)
+
+English | [简体中文](README-CN.md)
+
+This article describes how to connect to the OceanBase database through ``.
+
+For details about `gorm.io/driver/mysql`, you can refer to [gorm.io/driver/mysql](https://gorm.io/driver/mysql).
+
+## Quick Start
+
+You can use `conf` to create a database connection, please refer to [gorm.io/docs/](https://gorm.io/docs) for details.
+
+Take [example.go](example.go) code as an example.
+
+
+Modify the connection info in code, and use `run.sh` to run the example code.
+
+```bash
+sh run.sh
+```
+
+### Use PreparedStatement
+
+Log in to OceanBase with a root user and run the following command:
+
+```bash
+alter system set _ob_enable_prepared_statement = true;
+```

golang/gorm/example.go

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+package main
+
+import (
+	"flag"
+	"fmt"
+
+	"gorm.io/driver/mysql"
+	"gorm.io/gorm"
+
+	stdmysql "github.com/go-sql-driver/mysql"
+)
+
+var (
+	host     string
+	port     int
+	username string
+	password string
+	database string
+)
+
+func init() {
+	flag.StringVar(&host, "host", "", "host")
+	flag.IntVar(&port, "port", 0, "port")
+	flag.StringVar(&username, "username", "", "username")
+	flag.StringVar(&password, "password", "", "password")
+	flag.StringVar(&database, "database", "", "database")
+
+	flag.Parse()
+}
+
+type Product struct {
+	ID    uint `gorm:"primaryKey;default:auto_random()"`
+	Code  string
+	Price uint
+}
+
+func main() {
+	//dsn := fmt.Sprintf("%s:%s@tcp(%s:%d)/%s", username, password, host, port, database)
+	conf := stdmysql.Config{
+		Addr:   fmt.Sprintf("%s:%d", host, port),
+		User:   username,
+		Passwd: password,
+		DBName: database,
+		// parameters
+	}
+	dial := mysql.New(mysql.Config{DSNConfig: &conf})
+	db, err := gorm.Open(dial, &gorm.Config{})
+	if err != nil {
+		panic("failed to connect database")
+	}
+
+	if err := db.AutoMigrate(&Product{}); err != nil {
+		panic(err)
+	}
+
+	insertProduct := &Product{Code: "D42", Price: 100}
+
+	db.Create(insertProduct)
+	fmt.Printf("insert ID: %d, Code: %s, Price: %d\n",
+		insertProduct.ID, insertProduct.Code, insertProduct.Price)
+
+	readProduct := &Product{}
+	db.First(&readProduct, "code = ?", "D42") // find product with code D42
+
+	fmt.Printf("read ID: %d, Code: %s, Price: %d\n",
+		readProduct.ID, readProduct.Code, readProduct.Price)
+}

golang/gorm/go.mod

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+module github.com/oceanbase/ob-samples/gorm
+
+go 1.19
+
+require (
+	gorm.io/driver/mysql v1.5.6
+	gorm.io/gorm v1.25.10
+)
+
+require (
+	github.com/go-sql-driver/mysql v1.7.0 // indirect
+	github.com/jinzhu/inflection v1.0.0 // indirect
+	github.com/jinzhu/now v1.1.5 // indirect
+)

golang/gorm/run.sh

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+#!/usr/bin/env bash
+cd `dirname $0`
+CGO_ENABLED=0 GO111MODULE=on go run example.go