[Go] golang連接查詢mysql

package main

import (
	"database/sql"
	_ "github.com/go-sql-driver/mysql"
	"log"
)

func main() {
	//連接數據庫查詢
	db, err := sql.Open("mysql", "root:xxx@tcp(xxx:3306)/my_test")
	if err != nil {
		log.Fatal(err.Error())
	}
	//最終關閉數據庫
	defer db.Close()
	mSql := "select * from user"
	rows, err := db.Query(mSql)
	if err != nil {
		log.Fatal(err.Error())
	}

	//獲取列名
	columns, _ := rows.Columns()

	//定義一個切片,長度是字段的個數,切片里面的元素類型是sql.RawBytes
	values := make([]sql.RawBytes, len(columns))
	//定義一個切片,元素類型是interface{} 接口
	scanArgs := make([]interface{}, len(values))
	for i := range values {
		//把sql.RawBytes類型的地址存進去了
		scanArgs[i] = &values[i]
	}
	//獲取字段值
	var result []map[string]string
	for rows.Next() {
		res := make(map[string]string)
		rows.Scan(scanArgs...)
		for i, col := range values {
			res[columns[i]] = string(col)
		}
		result = append(result, res)
	}

	//遍歷結果
	for _, r := range result {
		for k, v := range r {
			log.Printf("%s==%s", k, v)
		}
	}
	rows.Close()
}