feat: ent select fields.

entgo/query/select_test.go

@@ -0,0 +1,48 @@
+package entgo
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"entgo.io/ent/dialect"
+	"entgo.io/ent/dialect/sql"
+)
+
+func TestBuildFieldSelect(t *testing.T) {
+	t.Run("MySQL_2Fields", func(t *testing.T) {
+		s := sql.Dialect(dialect.MySQL).Select("*").From(sql.Table("users"))
+
+		BuildFieldSelect(s, []string{"id", "username"})
+		query, args := s.Query()
+		require.Equal(t, "SELECT `id`, `username` FROM `users`", query)
+		require.Empty(t, args)
+
+	})
+	t.Run("PostgreSQL_2Fields", func(t *testing.T) {
+		s := sql.Dialect(dialect.Postgres).Select("*").From(sql.Table("users"))
+
+		BuildFieldSelect(s, []string{"id", "username"})
+		query, args := s.Query()
+		require.Equal(t, `SELECT "id", "username" FROM "users"`, query)
+		require.Empty(t, args)
+	})
+
+	t.Run("MySQL_AllFields", func(t *testing.T) {
+		s := sql.Dialect(dialect.MySQL).Select("*").From(sql.Table("users"))
+
+		BuildFieldSelect(s, []string{})
+		query, args := s.Query()
+		require.Equal(t, "SELECT * FROM `users`", query)
+		require.Empty(t, args)
+
+	})
+	t.Run("PostgreSQL_AllFields", func(t *testing.T) {
+		s := sql.Dialect(dialect.Postgres).Select("*").From(sql.Table("users"))
+
+		BuildFieldSelect(s, []string{})
+		query, args := s.Query()
+		require.Equal(t, `SELECT * FROM "users"`, query)
+		require.Empty(t, args)
+	})
+}