golang擷取資料錶轉換為json通用方法

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package mainimport (    "database/sql"    "fmt"    "log"    "net/http"    "time"    _ "github.com/go-sql-driver/mysql")import "strings"func main() {    http.HandleFunc("/getuser", getuser)    s := &http.Server{        Addr:           ":7080",        ReadTimeout:    30 * time.Second,        WriteTimeout:   30 * time.Second,        MaxHeaderBytes: 1 << 20,    }    log.Fatal(s.ListenAndServe())}func getuser(w http.ResponseWriter, r *http.Request) {    w.Write([]byte(getuser_json()))}func getuser_json() string {    db, err := sql.Open("mysql", "root:root@tcp(localhost:3306)/jeecg?charset=utf8")    if err != nil {        panic(err.Error())    }    defer db.Close()    rows, err := db.Query("select * from t_s_user")    if err != nil {        panic(err.Error())    }    columns, err := rows.Columns()    if err != nil {        panic(err.Error())    }    values := make([]sql.RawBytes, len(columns))    scanArgs := make([]interface{}, len(values))for i := range values {        scanArgs[i] = &values[i]    }    list := "["    for rows.Next() {        err = rows.Scan(scanArgs...)        if err != nil {            fmt.Println("log:", err)            panic(err.Error())        }        row := "{"        var value string        for i, col := range values {            if col == nil {                value = "NULL"            } else {                value = string(col)            }            columName := strings.ToLower(columns[i])            cell := fmt.Sprintf(`"%v":"%v"`, columName, value)            row = row + cell + ","        }        row = row[0 : len(row)-1]        row += "}"        list = list + row + ","    }    list = list[0 : len(list)-1]    list += "]"    fmt.Println(list)    return list}

 

調用url : http://localhost:7080/getuser