go语言将表数据动态转成切片(字段任意拓展)

package main

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

//先把字段的值都当成字符串
func Rows2SliceMap(rows *sql.Rows) (list []map[string]string) {
    //字段名称
    columns, _ := rows.Columns()
    //多少个字段
    length := len(columns)
    //每一行字段的值
    values := make([]sql.RawBytes, length)
    //保存的是values的内存地址
    pointer := make([]interface{}, length)
    //
    for i := 0; i < length; i++ {
        pointer[i] = &values[i]
    }
    //
    for rows.Next() {
        //把参数展开，把每一行的值存到指定的内存地址去，循环覆盖，values也就跟着被赋值了
        rows.Scan(pointer...)
        //每一行
        row := make(map[string]string)
        for i := 0; i < length; i++ {
            row[columns[i]] = string(values[i])
        }
        list = append(list, row)
    }
    //
    return
}

func main() {
    db, err := sql.Open("mysql", "root:1234@tcp(192.168.99.165:3306)/test?charset=utf8")
    if err != nil {
        log.Println(err.Error())
    }
    err = db.Ping()
    if err != nil {
        log.Println(err.Error())
    }
    rows, _ := db.Query("select * from cms")
    defer rows.Close()
    list := Rows2SliceMap(rows)
    for k, v := range list {
        fmt.Println(k)
        fmt.Println(v["id"], v["name"], v["sex"], v["age"])
    }
}

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