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// Copyright 2019-present Facebook Inc. All rights reserved.
// This source code is licensed under the Apache 2.0 license found
// in the LICENSE file in the root directory of this source tree.
package schema
import (
"context"
"io"
"strings"
"github.com/facebook/ent/dialect"
)
// WriteDriver is a driver that writes all driver exec operations to its writer.
type WriteDriver struct {
dialect.Driver // underlying driver.
io.Writer // target for exec statements.
}
// Exec writes its query and calls the underlying driver Exec method.
func (w *WriteDriver) Exec(_ context.Context, query string, _, _ interface{}) error {
if !strings.HasSuffix(query, ";") {
query += ";"
}
_, err := io.WriteString(w, query+"\n")
return err
}
// Tx writes the transaction start.
func (w *WriteDriver) Tx(context.Context) (dialect.Tx, error) {
if _, err := io.WriteString(w, "BEGIN;\n"); err != nil {
return nil, err
}
return w, nil
}
// Commit writes the transaction commit.
func (w *WriteDriver) Commit() error {
_, err := io.WriteString(w, "COMMIT;\n")
return err
}
// Rollback writes the transaction rollback.
func (w *WriteDriver) Rollback() error {
_, err := io.WriteString(w, "ROLLBACK;\n")
return err
}
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