gocctl model v20200819 (#18)

* rename snake、came method

* new: generate model from data source

* add change log md

* update model doc

* update  doc

* beauty code

tools/goctl/goctl.go

@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"os"
 
+	"github.com/urfave/cli"
+
 	"github.com/tal-tech/go-zero/core/logx"
 	"github.com/tal-tech/go-zero/tools/goctl/api/apigen"
 	"github.com/tal-tech/go-zero/tools/goctl/api/dartgen"
@@ -18,7 +20,6 @@ import (
 	"github.com/tal-tech/go-zero/tools/goctl/docker"
 	"github.com/tal-tech/go-zero/tools/goctl/feature"
 	"github.com/tal-tech/go-zero/tools/goctl/model/sql/command"
-	"github.com/urfave/cli"
 )
 
 var (
@@ -191,25 +192,64 @@ var (
 		{
 			Name:  "model",
 			Usage: "generate model code",
-			Flags: []cli.Flag{
-				cli.StringFlag{
-					Name:  "src, s",
-					Usage: "the file path of the ddl source file",
-				},
-				cli.StringFlag{
-					Name:  "dir, d",
-					Usage: "the target dir",
-				},
-				cli.BoolFlag{
-					Name:  "cache, c",
-					Usage: "generate code with cache [optional]",
-				},
-				cli.BoolFlag{
-					Name:  "idea",
-					Usage: "for idea plugin [optional]",
+			Subcommands: []cli.Command{
+				{
+					Name:  "mysql",
+					Usage: `generate mysql model"`,
+					Subcommands: []cli.Command{
+						{
+							Name:  "ddl",
+							Usage: `generate mysql model from ddl"`,
+							Flags: []cli.Flag{
+								cli.StringFlag{
+									Name:  "src, s",
+									Usage: "the file path of the ddl source file",
+								},
+								cli.StringFlag{
+									Name:  "dir, d",
+									Usage: "the target dir",
+								},
+								cli.BoolFlag{
+									Name:  "cache, c",
+									Usage: "generate code with cache [optional]",
+								},
+								cli.BoolFlag{
+									Name:  "idea",
+									Usage: "for idea plugin [optional]",
+								},
+							},
+							Action: command.MysqlDDL,
+						},
+						{
+							Name:  "datasource",
+							Usage: `generate model from datasource"`,
+							Flags: []cli.Flag{
+								cli.StringFlag{
+									Name:  "url",
+									Usage: `the data source of database,like "root:password@tcp(127.0.0.1:3306)/database"`,
+								},
+								cli.StringFlag{
+									Name:  "table, t",
+									Usage: `source table,tables separated by commas,like "user,course"`,
+								},
+								cli.BoolFlag{
+									Name:  "cache, c",
+									Usage: "generate code with cache [optional]",
+								},
+								cli.StringFlag{
+									Name:  "dir, d",
+									Usage: "the target dir",
+								},
+								cli.BoolFlag{
+									Name:  "idea",
+									Usage: "for idea plugin [optional]",
+								},
+							},
+							Action: command.MyDataSource,
+						},
+					},
 				},
 			},
-			Action: command.Mysql,
 		},
 		{
 			Name:  "config",