Fixed a bug where the postgres queries failed with a relation error. /data now dumps all the categories in the database.

cmd/inv/main.go

@@ -2,7 +2,7 @@ package main
 
 import (
 	"database/sql"
-	_ "encoding/json"
+	"encoding/json"
 	"fmt"
 	"net/http"
 	"time"
@@ -10,6 +10,7 @@ import (
 	_ "github.com/lib/pq"
 )
 
+//Go Best practices: https://github.com/golovers/effective-go
 type Item struct {
 	Id                int32       `json:"id"`
 	Name              int32       `json:"name"`
@@ -46,12 +47,30 @@ func main() {
 }
 
 func get(w http.ResponseWriter, r *http.Request) {
-	w.WriteHeader(http.StatusBadGateway)
-	w.Write([]byte("Hell world!"))
+	c := sql_test()
+
+	// if c.Id == 0 {
+	// 	w.WriteHeader(http.StatusBadGateway)
+	// 	w.Write([]byte("Failed"))
+	// 	return
+	// }
+
+	jsonBytes, err := json.Marshal(c)
+
+	if err != nil {
+		w.WriteHeader(http.StatusMethodNotAllowed)
+		w.Write([]byte("Failed 3"))
+		return
+	}
+
+	w.WriteHeader(http.StatusOK)
+	w.Write(jsonBytes)
 }
 
-func sql_test() {
-	psqlInfo := fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s sslmode=disable", "localhost", 5432, "postgres", "", "inventory")
+func sql_test() []Category {
+	//Note: The postgres driver seems to get confused when no password is supplied, so omit it in the connection sting.
+	//https://rajyavardhan.medium.com/when-you-get-relation-does-not-exist-in-postgres-7ffb0c3c674b
+	psqlInfo := fmt.Sprintf("host=%s port=%d user=%s dbname=%s sslmode=disable", "localhost", 5432, "postgres", "inventory")
 	db, err := sql.Open("postgres", psqlInfo)
 
 	if err != nil {
@@ -60,11 +79,25 @@ func sql_test() {
 
 	defer db.Close()
 
-	rows, err := db.Query("")
+	rows, err := db.Query("SELECT * FROM category;")
 
 	if err != nil {
 		panic(err)
 	}
 
 	defer rows.Close()
+
+	var categories []Category
+
+	for rows.Next() {
+		var category Category
+
+		if err = rows.Scan(&category.Id, &category.Name); err != nil {
+			println(err.Error())
+		}
+
+		categories = append(categories, category)
+	}
+
+	return categories
 }