Implement query parser

types.go

@@ -4,22 +4,22 @@ import "time"
 
 type (
 	Guild struct {
-		ID   int
+		ID   int64
 		Name string `json:"name"`
 	}
 	Player struct {
-		ID   int
+		ID   int64
 		Name string `json:"name"`
 		Guild Guild `json:"guild"`
 	}
 	Association struct {
-		ID   int
+		ID   int64
 		LHS  Player
 		RHS  Player
 		Note string
 	}
 	Note struct {
-		ID        int
+		ID        int64
 		Content   string
 		Timestamp time.Time
 		Player    Player

utils.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"fmt"
+	"reflect"
+	"strings"
+)
+
+func BuildWhereQuery(params interface{}) string {
+	conditions := []string{}
+	v := reflect.ValueOf(params)
+	t := v.Type()
+
+	for i := 0; i < v.NumField(); i++ {
+		field := v.Field(i)
+		if field.Kind() == reflect.Ptr && !field.IsNil() {
+			dbTag := t.Field(i).Tag.Get("db")
+			if dbTag != "" {
+				switch field.Elem().Kind() {
+				case reflect.String:
+					conditions = append(conditions, fmt.Sprintf("%s = '%s'", dbTag, field.Elem().String()))
+				case reflect.Bool:
+					conditions = append(conditions, fmt.Sprintf("%s = %t", dbTag, field.Elem().Bool()))
+				case reflect.Int:
+					conditions = append(conditions, fmt.Sprintf("%s = %d", dbTag, field.Elem().Int()))
+				case reflect.Int64:
+					conditions = append(conditions, fmt.Sprintf("%s = %d", dbTag, field.Elem().Int()))
+				}
+			}
+		}
+	}
+
+	if len(conditions) > 0 {
+		return "WHERE " + strings.Join(conditions, " AND ")
+	}
+	return ""
+}