update doc and tests for oracle flavor

Author: huandu

README.md

@@ -168,7 +168,7 @@ There are also some methods to combine conditions.
 
 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`, `ClickHouse` and `Presto` are defined in flavor list. Feel free to open issue or send pull request if anyone asks for a new flavor.
+Right now, `MySQL`, `PostgreSQL`, `SQLServer`, `SQLite`, `CQL`, `ClickHouse`, `Presto` and `Oracle` 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`.
 

flavor_test.go

@@ -18,6 +18,9 @@ func TestFlavor(t *testing.T) {
 		PostgreSQL: "PostgreSQL",
 		SQLite:     "SQLite",
 		SQLServer:  "SQLServer",
+		CQL:        "CQL",
+		ClickHouse: "ClickHouse",
+		Oracle:     "Oracle",
 	}
 
 	for f, expected := range cases {

insert_test.go

@@ -65,7 +65,7 @@ func ExampleInsertBuilder() {
 	// [1 Huan Du 1 2 Charmy Liu 1 1234567890]
 }
 
-func ExampleInsertBuilder_Oracle() {
+func ExampleInsertBuilder_flavorOracle() {
 	ib := Oracle.NewInsertBuilder()
 	ib.InsertInto("demo.user")
 	ib.Cols("id", "name", "status")