update readme and format code

Author: huandu

README.md

@@ -9,7 +9,7 @@
 - [Usage](#usage)
   - [Basic usage](#basic-usage)
   - [Pre-defined SQL builders](#pre-defined-sql-builders)
-  - [Build SQL for MySQL, PostgreSQL, SQLServer, SQLite, CQL, or ClickHouse](#build-sql-for-mysql-postgresql-sqlserve-sqlite-or-clickhouse)
+  - [Build SQL for different systems](#build-sql-for-different-systems)
   - [Using `Struct` as a light weight ORM](#using-struct-as-a-light-weight-orm)
   - [Nested SQL](#nested-sql)
   - [Use `sql.Named` in a builder](#use-sqlnamed-in-a-builder)
@@ -110,9 +110,11 @@ Following are some utility methods to deal with special cases.
 
 To learn how to use builders, check out [examples on GoDoc](https://pkg.go.dev/github.com/huandu/go-sqlbuilder#pkg-examples).
 
-### Build SQL for MySQL, PostgreSQL, SQLServer, SQLite, CQL, or ClickHouse
+### Build SQL for different systems
 
-Parameter markers are different in MySQL, PostgreSQL, SQLServer and SQLite. This package provides some methods to set the type of markers (we call it "flavor") in all builders.
+SQL syntax and parameter marks vary in different systems. In this package, we introduce a concept called "flavor" to smooth out these difference.
+
+Right now, MySQL, PostgreSQL, SQLServer, SQLite, CQL and ClickHouse are defined in flavor list. Feel free to open issue or send pull request if anyone asks for a new flavor.
 
 By default, all builders uses `DefaultFlavor` to build SQL. The default value is `MySQL`.
 

args.go

@@ -86,10 +86,10 @@ func (args *Args) add(arg interface{}) int {
 //
 // The format string uses a special syntax to represent arguments.
 //
-//     $? refers successive arguments passed in the call. It works similar as `%v` in `fmt.Sprintf`.
-//     $0 $1 ... $n refers nth-argument passed in the call. Next $? will use arguments n+1.
-//     ${name} refers a named argument created by `Named` with `name`.
-//     $$ is a "$" string.
+//	$? refers successive arguments passed in the call. It works similar as `%v` in `fmt.Sprintf`.
+//	$0 $1 ... $n refers nth-argument passed in the call. Next $? will use arguments n+1.
+//	${name} refers a named argument created by `Named` with `name`.
+//	$$ is a "$" string.
 func (args *Args) Compile(format string, initialValue ...interface{}) (query string, values []interface{}) {
 	return args.CompileWithFlavor(format, args.Flavor, initialValue...)
 }

select.go

@@ -110,7 +110,8 @@ func (sb *SelectBuilder) From(table ...string) *SelectBuilder {
 // Join sets expressions of JOIN in SELECT.
 //
 // It builds a JOIN expression like
-//     JOIN table ON onExpr[0] AND onExpr[1] ...
+//
+//	JOIN table ON onExpr[0] AND onExpr[1] ...
 func (sb *SelectBuilder) Join(table string, onExpr ...string) *SelectBuilder {
 	sb.marker = selectMarkerAfterJoin
 	return sb.JoinWithOption("", table, onExpr...)
@@ -119,16 +120,17 @@ func (sb *SelectBuilder) Join(table string, onExpr ...string) *SelectBuilder {
 // JoinWithOption sets expressions of JOIN with an option.
 //
 // It builds a JOIN expression like
-//     option JOIN table ON onExpr[0] AND onExpr[1] ...
+//
+//	option JOIN table ON onExpr[0] AND onExpr[1] ...
 //
 // Here is a list of supported options.
-//     - FullJoin: FULL JOIN
-//     - FullOuterJoin: FULL OUTER JOIN
-//     - InnerJoin: INNER JOIN
-//     - LeftJoin: LEFT JOIN
-//     - LeftOuterJoin: LEFT OUTER JOIN
-//     - RightJoin: RIGHT JOIN
-//     - RightOuterJoin: RIGHT OUTER JOIN
+//   - FullJoin: FULL JOIN
+//   - FullOuterJoin: FULL OUTER JOIN
+//   - InnerJoin: INNER JOIN
+//   - LeftJoin: LEFT JOIN
+//   - LeftOuterJoin: LEFT OUTER JOIN
+//   - RightJoin: RIGHT JOIN
+//   - RightOuterJoin: RIGHT OUTER JOIN
 func (sb *SelectBuilder) JoinWithOption(option JoinOption, table string, onExpr ...string) *SelectBuilder {
 	sb.joinOptions = append(sb.joinOptions, option)
 	sb.joinTables = append(sb.joinTables, table)