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server.go
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server.go
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package main
import (
"database/sql"
"fmt"
"log"
"net/http"
"os"
_ "github.com/lib/pq"
)
var (
db *sql.DB
)
func main() {
connInfo := fmt.Sprintf(
"user=postgres dbname=postgres password=%s host=%s port=%s sslmode=disable",
"mypass",
os.Getenv("DB_PORT_5432_TCP_ADDR"),
os.Getenv("DB_PORT_5432_TCP_PORT"),
)
var err error
db, err = sql.Open("postgres", connInfo)
if err != nil {
log.Fatal(err)
}
if err = db.Ping(); err != nil {
log.Fatal(err)
}
_, err = db.Exec(
`create table if not exists mydata (
id serial primary key,
val integer not null
)`)
if err != nil {
log.Fatal(err)
}
http.HandleFunc("/", serveIndex)
if err := http.ListenAndServe(":8080", nil); err != nil {
log.Fatal(err)
}
}
func serveIndex(resp http.ResponseWriter, req *http.Request) {
resp.Header().Set("Content-Type", "text/plain; charset=utf-8")
fmt.Fprintln(resp, "Hello, World!\n")
fmt.Fprintln(resp, "DB_ADDR:", os.Getenv("DB_PORT_5432_TCP_ADDR"))
fmt.Fprintln(resp, "DB_PORT:", os.Getenv("DB_PORT_5432_TCP_PORT"))
_, err := db.Exec("insert into mydata(val) values(0)")
if err != nil {
log.Fatal(err)
}
rows, err := db.Query("select id from mydata")
if err != nil {
log.Fatal(err)
}
for rows.Next() {
var id int
err = rows.Scan(&id)
if err != nil {
log.Fatal(err)
}
fmt.Fprintf(resp, "ID: %d\n", id)
}
}