Add simple ToSql implementations (#14)

storage.go

@@ -19,11 +19,31 @@ type ToSQL interface {
 // StringStatement is a plain string statement.
 type StringStatement string
 
+// Plain is a plain string statement.
+type Plain = StringStatement
+
 // ToSql implements query builder result.
 func (s StringStatement) ToSql() (string, []interface{}, error) { //nolint // Method name matches ext. implementation.
 	return string(s), nil, nil
 }
 
+type stmt struct {
+	query string
+	args  []interface{}
+}
+
+func (s stmt) ToSql() (string, []interface{}, error) { //nolint // Method name matches ext. implementation.
+	return s.query, s.args, nil
+}
+
+// Stmt is a statement with placeholder arguments.
+func Stmt(query string, args ...interface{}) ToSQL {
+	return stmt{
+		query: query,
+		args:  args,
+	}
+}
+
 // Open opens a database specified by its database driver name and a
 // driver-specific data source name, usually consisting of at least a
 // database name and connection information.

storage_test.go

@@ -347,3 +347,17 @@ func TestStorage_DB(t *testing.T) {
 
 	assert.Equal(t, dbx, st.DB())
 }
+
+func TestStmt_ToSql(t *testing.T) {
+	s, a, err := sqluct.Stmt("SELECT * FROM foo WHERE id=? AND name=?", 1, "bar").ToSql()
+	assert.Equal(t, "SELECT * FROM foo WHERE id=? AND name=?", s)
+	assert.Equal(t, []interface{}{1, "bar"}, a)
+	assert.NoError(t, err)
+}
+
+func TestPlain_ToSql(t *testing.T) {
+	s, a, err := sqluct.Plain("SELECT * FROM foo WHERE id=1 AND name='bar'").ToSql()
+	assert.Equal(t, "SELECT * FROM foo WHERE id=1 AND name='bar'", s)
+	assert.Nil(t, a)
+	assert.NoError(t, err)
+}