Feature model postgresql (#842)

* Support postgresql generate

* Update template Var

* Support to generate postgresql model

* Support to generate postgresql model

* Update template

Co-authored-by: anqiansong <anqiansong@xiaoheiban.cn>

tools/goctl/goctl.go

@@ -455,7 +455,48 @@ var (
 									Usage: "for idea plugin [optional]",
 								},
 							},
-							Action: model.MyDataSource,
+							Action: model.MySqlDataSource,
+						},
+					},
+				},
+				{
+					Name:  "postgresql",
+					Usage: `generate postgresql model`,
+					Subcommands: []cli.Command{
+						{
+							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: `the table or table globbing patterns in the database`,
+								},
+								cli.StringFlag{
+									Name:  "schema, s",
+									Usage: `the table schema, default is [public]`,
+								},
+								cli.BoolFlag{
+									Name:  "cache, c",
+									Usage: "generate code with cache [optional]",
+								},
+								cli.StringFlag{
+									Name:  "dir, d",
+									Usage: "the target dir",
+								},
+								cli.StringFlag{
+									Name:  "style",
+									Usage: "the file naming format, see [https://github.com/tal-tech/go-zero/tree/master/tools/goctl/config/readme.md]",
+								},
+								cli.BoolFlag{
+									Name:  "idea",
+									Usage: "for idea plugin [optional]",
+								},
+							},
+							Action: model.PostgreSqlDataSource,
 						},
 					},
 				},