loading driver and connStr from json if there is no commandline options specified

bee.json

@@ -13,5 +13,9 @@
 		"others": []
 	},
 	"cmd_args": [],
-	"envs": []
+	"envs": [],
+	"database": {
+		"driver": "mysql",
+		"conn": "root:@tcp(127.0.0.1:3306)/test"
+	}
 }

conf.go

@@ -36,7 +36,11 @@ var defaultConf = `{
 		"others": []
 	},
 	"cmd_args": [],
-	"envs": []
+	"envs": [],
+	"database": {
+		"driver": "mysql",
+		"conn": "root:@tcp(127.0.0.1:3306)/test"
+	}
 }
 `
 var conf struct {
@@ -62,6 +66,10 @@ var conf struct {
 		Dirs   []string
 		IngExt []string `json:"ignore_ext"`
 	}
+	Database struct {
+		Driver string
+		Conn   string
+	}
 }
 
 // loadConfig loads customized configuration.

migrate.go

@@ -70,16 +70,27 @@ func runMigration(cmd *Command, args []string) {
 		ColorLog("[HINT] Set $GOPATH in your environment vairables\n")
 		os.Exit(2)
 	}
+	// load config
+	err := loadConfig()
+	if err != nil {
+		ColorLog("[ERRO] Fail to parse bee.json[ %s ]\n", err)
+	}
 	// getting command line arguments
 	if len(args) != 0 {
 		cmd.Flag.Parse(args[1:])
 	}
+	if mDriver == "" {
+		mDriver = docValue(conf.Database.Driver)
 		if mDriver == "" {
 			mDriver = "mysql"
 		}
+	}
+	if mConn == "" {
+		mConn = docValue(conf.Database.Conn)
 		if mConn == "" {
 			mConn = "root:@tcp(127.0.0.1:3306)/test"
 		}
+	}
 	ColorLog("[INFO] Using '%s' as 'driver'\n", mDriver)
 	ColorLog("[INFO] Using '%s' as 'conn'\n", mConn)
 	driverStr, connStr := string(mDriver), string(mConn)