Golang で CouchDB のデータを作成 (Create)

Golang で CouchDB にデータを作成する方法です。

couch_create.go

// ----------------------------------------------------------------
//
//  couch_create.go
//
//                  May/20/2018
//
// ----------------------------------------------------------------
package main

import (
    "fmt"
    "encoding/json"
    "strings"
    "net/http"
    "log"
    "io"
)

// ----------------------------------------------------------------
func main () {

    fmt.Printf ("*** 開始 ***\n")

    url := "http://localhost:5984/nagano"

    deleteRequest(url,strings.NewReader(""))
    putRequest(url,strings.NewReader(""))

    dict_aa := data_prepare_proc ()

    for key,value := range dict_aa {
        output, _ := json.Marshal (value)
        json_str := string(output)
        url_target := url + "/" + key
        putRequest(url_target,strings.NewReader(json_str))
    }

    fmt.Printf ("*** 終了 ***\n")
}

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

    dict_aa["t2021"] = unit_gen_proc ("長野",71862,"1921-4-9")
    dict_aa["t2022"] = unit_gen_proc ("松本",36571,"1921-8-25")
    dict_aa["t2023"] = unit_gen_proc ("上田",18397,"1921-2-18")
    dict_aa["t2024"] = unit_gen_proc ("小諸",76518,"1921-1-30")
    dict_aa["t2025"] = unit_gen_proc ("岡谷",61459,"1921-6-24")
    dict_aa["t2026"] = unit_gen_proc ("塩尻",85623,"1921-1-10")
    dict_aa["t2027"] = unit_gen_proc ("茅野",15947,"1921-4-19")
    dict_aa["t2028"] = unit_gen_proc ("飯田",78231,"1921-7-28")
    dict_aa["t2029"] = unit_gen_proc ("中野",25948,"1921-6-8")
    dict_aa["t2030"] = unit_gen_proc ("諏訪",57832,"1921-4-11")
    dict_aa["t2031"] = unit_gen_proc ("駒ヶ根",46182,"1921-3-16")
    dict_aa["t2032"] = unit_gen_proc ("佐久",82396,"1921-5-12")
    dict_aa["t2033"] = unit_gen_proc ("伊那",21858,"1921-9-18")
    dict_aa["t2034"] = unit_gen_proc ("千曲",43172,"1921-5-21")

    return (dict_aa)
}

// ----------------------------------------------------------------
func putRequest(url string, data io.Reader)  {
    client := &http.Client{}
    req, err := http.NewRequest(http.MethodPut, url, data)
    if err != nil {
        // handle error
        log.Fatal(err)
    }
    _, err = client.Do(req)
    if err != nil {
        // handle error
        log.Fatal(err)
    }
}

// ----------------------------------------------------------------
func deleteRequest(url string, data io.Reader)  {
    client := &http.Client{}
    req, err := http.NewRequest(http.MethodDelete, url, data)
    if err != nil {
        // handle error
        log.Fatal(err)
    }
    _, err = client.Do(req)
    if err != nil {
        // handle error
        log.Fatal(err)
    }
}

// ----------------------------------------------------------------
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)
}

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

Makefile

couch_create: couch_create.go
    go build couch_create.go
clean:
    rm -f couch_create

実行コマンド

./couch_create

次のバージョンで確認しました。

$ go version
go version go1.13.8 linux/amd64