add correct example for pg's url (#857)

tools/goctl/goctl.go

@@ -456,7 +456,7 @@ var (
 							Flags: []cli.Flag{
 								cli.StringFlag{
 									Name:  "url",
-									Usage: `the data source of database,like "root:password@tcp(127.0.0.1:3306)/database`,
+									Usage: `the data source of database,like "root:password@tcp(127.0.0.1:3306)/database"`,
 								},
 								cli.StringFlag{
 									Name:  "table, t",
@@ -497,7 +497,7 @@ var (
 							Flags: []cli.Flag{
 								cli.StringFlag{
 									Name:  "url",
-									Usage: `the data source of database,like "root:password@tcp(127.0.0.1:3306)/database`,
+									Usage: `the data source of database,like "postgres://root:password@127.0.0.1:54332/database?sslmode=disable"`,
 								},
 								cli.StringFlag{
 									Name:  "table, t",

tools/goctl/model/sql/command/command.go

@@ -199,7 +199,7 @@ func fromMysqlDataSource(url, pattern, dir string, cfg *config.Config, cache, id
 func fromPostgreSqlDataSource(url, pattern, dir, schema string, cfg *config.Config, cache, idea bool) error {
 	log := console.NewConsole(idea)
 	if len(url) == 0 {
-		log.Error("%v", "expected data source of mysql, but nothing found")
+		log.Error("%v", "expected data source of postgresql, but nothing found")
 		return nil
 	}