GO mit Führungsterminen angepasst

GO/sternwarte_fdates/fdates/fdates.go

@@ -0,0 +1 @@
+package fdates

GO/sternwarte_fdates/go.mod

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+module rexfue.de/fdates
+
+go 1.16
+
+require github.com/go-sql-driver/mysql v1.6.0

GO/sternwarte_fdates/go.sum

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+github.com/go-sql-driver/mysql v1.6.0 h1:BCTh4TKNUYmOmMUcQ3IipzF5prigylS7XXjEkfCHuOE=
+github.com/go-sql-driver/mysql v1.6.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=

GO/sternwarte_fdates/main/main.go

@@ -0,0 +1,77 @@
+package sendAllOff
+
+import (
+	"database/sql"
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+
+	_ "github.com/go-sql-driver/mysql"
+)
+
+/*
+ * Tag... - a very simple struct
+ */
+type Tag struct {
+	datetime string `json:"datetime"`
+}
+
+func sendAllOff() {
+	fmt.Println("Go MySQL Tutorial")
+
+	// Open up our database connection.
+	// I've set up a database on my local machine using phpmyadmin.
+	// The database is called testDb
+	db, err := sql.Open("mysql", "root:SFluorit@tcp(127.0.0.1:3306)/sternwarte")
+
+	// if there is an error opening the connection, handle it
+	if err != nil {
+		panic(err.Error())
+	}
+
+	db.SetConnMaxLifetime(time.Minute * 3)
+	db.SetMaxOpenConns(10)
+	db.SetMaxIdleConns(10)
+
+	// defer the close till after the sendAllOff function has finished
+	// executing
+	defer db.Close()
+
+	// Execute the query
+	results, err := db.Query("SELECT datetime FROM fdates")
+	if err != nil {
+		panic(err.Error()) // proper error handling instead of panic in your app
+	}
+
+	for results.Next() {
+		var tag Tag
+		// for each row, scan the result into our tag composite object
+		err = results.Scan(&tag.datetime)
+		if err != nil {
+			panic(err.Error()) // proper error handling instead of panic in your app
+		}
+		// datetime in das datum von fdatum umwandeln
+		str := strings.Replace(tag.datetime[0:10], "-", "", -1)
+		fmt.Println(str)
+		// einen int draus machen
+		i, err := strconv.Atoi(str)
+		if err != nil {
+			// handle error
+			fmt.Println(err)
+		}
+		// Update-query erzeugen
+		query := fmt.Sprintf("UPDATE fdates SET datum='%d' WHERE datetime='%s'", i, tag.datetime)
+		// update ausführen
+		update, err := db.Query(query)
+
+		// if there is an error inserting, handle it
+		if err != nil {
+			panic(err.Error())
+		}
+		// be careful deferring Queries if you are using transactions
+		update.Close()
+
+	}
+
+}