fix issue in prefix feature for method operations of gdb

.example/database/gdb/mysql/config.toml

@@ -1,7 +1,7 @@
 
 # MySQL数据库配置
 [database]
-	debug = true
+#	debug = true
     link  = "mysql:root:12345678@tcp(127.0.0.1:3306)/test?parseTime=true&loc=Local"
 
 #[database]

.example/database/gdb/mysql/gdb_debug1.go

@@ -1,8 +1,6 @@
 package main
 
 import (
-	"fmt"
-
 	"github.com/gogf/gf/database/gdb"
 	"github.com/gogf/gf/frame/g"
 	"github.com/gogf/gf/os/glog"
@@ -23,7 +21,7 @@ func main() {
 	if err != nil {
 		panic(err)
 	}
-	db.SetDebug(true)
+	//db.SetDebug(false)
 
 	glog.SetPath("/tmp")
 
@@ -36,7 +34,4 @@ func main() {
 
 	db.Table("user").Data(g.Map{"name": "smith"}).Where("uid=?", 1).Save()
 
-	db.PrintQueriedSqls()
-
-	fmt.Println(db.GetLastSql())
 }

.example/database/gdb/mysql/gdb_debug2.go

@@ -6,6 +6,7 @@ import (
 
 func main() {
 	db := g.DB()
+
 	// 执行3条SQL查询
 	for i := 1; i <= 3; i++ {
 		db.Table("user").Where("id=?", i).One()