improve gconv.Bool for NO/YES; improve gdb for model generation

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

@@ -1,5 +1,5 @@
 
 # MySQL数据库配置
 [database]
-    link = "mysql:luoling2013:m5k2s8p5@tcp(127.0.0.1:3306)/test"
+    link = "mysql:root:12345678@tcp(127.0.0.1:3306)/test"
 

.example/database/gdb/mysql/gdb_tables.go

@@ -0,0 +1,18 @@
+package main
+
+import (
+	"github.com/gogf/gf/frame/g"
+)
+
+func main() {
+	db := g.DB()
+	db.SetDebug(true)
+
+	tables, err := db.Tables()
+	if err != nil {
+		panic(err)
+	}
+	if tables != nil {
+		g.Dump(tables)
+	}
+}

.example/database/gdb/mysql/gdb_tables_fields.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"github.com/gogf/gf/frame/g"
+)
+
+func main() {
+	db := g.DB()
+	db.SetDebug(true)
+
+	tables, e := db.Tables()
+	if e != nil {
+		panic(e)
+	}
+	if tables != nil {
+		g.Dump(tables)
+		for _, table := range tables {
+			fields, err := db.TableFields(table)
+			if err != nil {
+				panic(err)
+			}
+			g.Dump(fields)
+		}
+	}
+}