Try to add logger

README.md

@@ -668,9 +668,10 @@ db.Where("email = ?", "x@example.org").Attrs(User{FromIp: "111.111.111.111"}).Fi
 ```
 
 ## TODO
+* Transaction
+* Logger
+* Join, Having, Group
 * Index, Unique, Valiations
-* SQL Log
-* SQL Query with goroutines
 
 # Author
 

chain.go

@@ -32,6 +32,7 @@ func (s *Chain) err(err error) error {
 	if err != nil {
 		s.Errors = append(s.Errors, err)
 		s.Error = err
+		warn(err)
 	}
 	return err
 }

logger.go

@@ -0,0 +1,31 @@
+package gorm
+
+import "fmt"
+
+var logger interface{}
+
+type Logger interface {
+	Print(v ...interface{})
+}
+
+func Print(level string, v ...interface{}) {
+	args := []interface{}{level}
+
+	if l, ok := logger.(Logger); ok {
+		l.Print(append(args, v...))
+	} else {
+		fmt.Println("logger haven't been set,", append(args, v...))
+	}
+}
+
+func warn(v ...interface{}) {
+	Print("warn", v...)
+}
+
+func info(v ...interface{}) {
+	Print("info", v...)
+}
+
+func debug(v ...interface{}) {
+	Print("debug", v...)
+}

main.go

@@ -19,6 +19,10 @@ func (s *DB) SetPool(n int) {
 	s.db.SetMaxIdleConns(n)
 }
 
+func (s *DB) SetLogger(l interface{}) {
+	logger = l
+}
+
 func (s *DB) SingularTable(result bool) {
 	singularTableName = result
 }

utils.go

@@ -63,8 +63,3 @@ func getInterfaceAsString(value interface{}) (str string, err error) {
 	}
 	return
 }
-
-func debug(value interface{}) {
-	fmt.Printf("***************\n")
-	fmt.Printf("%+v\n\n", value)
-}