60 lines
1017 B
Go
60 lines
1017 B
Go
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package main
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import (
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"database/sql"
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"flag"
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"fmt"
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"log"
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"encoding/json"
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_ "github.com/go-sql-driver/mysql"
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)
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var (
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dbURL = flag.String("db", "julian:hi@/test", "The Database")
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)
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func main() {
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flag.Parse()
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db, err := sql.Open("mysql", *dbURL)
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if err != nil {
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log.Fatal(err)
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}
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if err = readStudiengaenge(db); err != nil {
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log.Fatal("readStudiengaenge:", err)
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}
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result, err := db.Query("SELECT Vorname, Nachname, Matrnr, Studiengang FROM Teilnehmer")
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if err != nil {
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log.Fatal("error fetching students:", err)
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}
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var (
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stud Student
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ID int
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)
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for result.Next() {
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if err = result.Scan(&stud.Vorname, &stud.Nachname, &stud.Matrnr, &ID); err != nil {
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log.Println("could not retrieve Student:", err)
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continue
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}
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name, ok := studiengaenge[ID]
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if !ok {
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log.Println("illegal Studiengang:", ID)
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continue
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}
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stud.Studiengang = name
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out, err := json.Marshal(stud)
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if err != nil {
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log.Fatal("could not marshal to json:", err)
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}
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fmt.Println(string(out))
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}
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}
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