我正尝试使用GO将数据从.csv(前缀固定宽度/表格)转换为POSTGRES。
我所做的:
package main
import (
"bufio"
"database/sql"
"encoding/csv"
"encoding/json"
"fmt"
"io"
"log"
"os"
)
type Consumidor struct {
CPF string `json:"CPF"`
Private string `json:"Private"`
Incompleto string `json:"Incompleto"`
Compras *Compras `json:"Compras,omitempty"`
}
type Compras struct {
DataUltimacompra string `json:"DataUltimacompra"`
TicketMedio string `json:"TicketMedio"`
TicketUltimaCompra string `json:"TicketUltimaCompra"`
LojaMaisFrequente string `json:"LojaMaisFrequente"`
LojaUltimaCompra string `json:"LojaUltimaCompra"`
}
const (
host = "localhost"
port = 5432
user = "postgres"
password = ""
dbname = "neoway"
)
func main() {
csvFile, _ := os.Open("data.csv")
reader := csv.NewReader(bufio.NewReader(csvFile))
var dadosinsert []Consumidor
for {
line, error := reader.Read()
if error == io.EOF {
break
} else if error != nil {
log.Fatal(error)
}
dadosinsert = append(dadosinsert, Consumidor{
CPF: line[0],
Private: line[1],
Incompleto: line[2],
Compras: &Compras{
DataUltimacompra: line[3],
TicketMedio: line[4],
TicketUltimaCompra: line[5],
LojaMaisFrequente: line[6],
LojaUltimaCompra: line[7],
},
})
}
peopleJson, _ := json.Marshal(dadosinsert)
fmt.Println(string(peopleJson))
psqlInfo := fmt.Sprintf("host=%s port=%d user=%s "+
"password=%s dbname=%s sslmode=disable",
host, port, user, password, dbname)
db, err := sql.Open("postgres", psqlInfo)
if err != nil {
panic(err)
}
defer db.Close()
sqlStatement := `
INSERT INTO base_teste (CPF,"PRIVATE","INCOMPLETO","DATA DA ÚLTIMA COMPRA","TICKET MÉDIO","TICKET DA ÚLTIMA COMPRA","LOJA MAIS FREQUÊNTE","LOJA DA ÚLTIMA COMPRA")
)
VALUES ($1, $2, $3, $4, $5, $6, 7$, 8$)
RETURNING id`
id := 0
err = db.QueryRow(sqlStatement, 30, "a", "b", "c").Scan(&id)
if err != nil {
panic(err)
}
fmt.Println("New record ID is:", id)
}
字符串
当我运行时,我得到这个错误
[{“CPF”:“xxxxx”,“Private”:“TRUE”,“Incompleto”:“不完整”,“Compras”:{“DataUltimacompra”:“12/10/2018”,“TicketMedio”:“200”,“TicketUltimaCompra”:“250”,“LojaMaisFrequente”:“111.111.111-99”,“LojaUltimaCompra”:“111.111.111-88”}}] panic:sql:unknown driver“postgres”(forgotten import?)
goroutine 1 [running]:main.main()C:/Users/Willian/Desktop/NEOWAY PROJECT/neoway csv prefixed width importer/main.go:70 +0xbed
进程已完成,退出代码为2
1条答案
按热度按时间lmvvr0a81#
你导入了
sql/database
,一个包含通用接口的包,用于sql相关的操作。因为它只是一个 * 通用接口 *,所以您需要导入接口的具体实现,在此上下文中,它是数据库驱动程序。
从你的代码:
sql.Open("postgres", psqlInfo)
,我假设你使用的是postgresql数据库。有一些postgresql drivers for golang可用,其中一个是https://github.com/lib/pq驱动程序。所以将其添加到import语句中。字符串
数据库驱动程序
pq
必须在导入语句前使用_
字符导入。这是因为我们没有在代码中显式使用它,同时database/sql
包仍然需要它。有关详细信息,请参阅此相关SO问题What does an underscore in front of an import statement mean?。关于golang sql:https://pkg.go.dev/database/sql的更多信息。