Add suppport to standard sql.Scanner in Scan methods.

example_test.go

@@ -38,6 +38,7 @@ func Example() {
 		fmt.Println(name)
 		return
 	})
+	check(err)
 	// Output: gosqlite driver
 }
 
@@ -117,10 +118,18 @@ func ExampleStmt_NamedScan() {
 		fmt.Println(id, name)
 		return
 	})
+	check(err)
 	// Output: 1 Go
 	// 2 SQLite
 }
 
+type YesOrNo bool
+
+func (b *YesOrNo) Scan(src interface{}) error {
+	*b = YesOrNo(src == "Y" || src == "yes")
+	return nil
+}
+
 func ExampleStmt_Scan() {
 	db, err := sqlite.Open(":memory:")
 	check(err)
@@ -132,20 +141,16 @@ func ExampleStmt_Scan() {
 
 	var id int
 	var name string
-	var status bool
-
-	converter := func(value interface{}) (bool, error) {
-		status = value == "Y" || value == "yes"
-		return false, nil
-	}
+	var status YesOrNo
 
 	err = s.Select(func(s *sqlite.Stmt) (err error) {
-		if err = s.Scan(&id, &name, converter); err != nil {
+		if err = s.Scan(&id, &name, &status); err != nil {
 			return
 		}
 		fmt.Println(id, name, status)
 		return
 	})
+	check(err)
 	// Output: 1 Go true
 	// 2 SQLite true
 }

stmt.go

@@ -32,6 +32,7 @@ static int my_prepare_v2(sqlite3 *db, const char *zSql, int nByte, sqlite3_stmt
 import "C"
 
 import (
+	"database/sql"
 	"errors"
 	"fmt"
 	"time"
@@ -682,11 +683,13 @@ func (s *Stmt) ScanByIndex(index int, value interface{}) (bool, error) {
 		}
 	case *time.Time: // go fix doesn't like this type!
 		*value, isNull, err = s.ScanTime(index)
+	case sql.Scanner:
+		v := s.ScanValue(index, false)
+		err = value.Scan(v)
+		isNull = v == nil
 	case *interface{}:
 		*value = s.ScanValue(index, false)
 		isNull = *value == nil
-	case func(interface{}) (bool, error):
-		isNull, err = value(s.ScanValue(index, false))
 	default:
 		return false, s.specificError("unsupported type in Scan: %T", value)
 	}