本文整理汇总了Golang中github.com/jackc/pgx.Tx.Rollback方法的典型用法代码示例。如果您正苦于以下问题：Golang Tx.Rollback方法的具体用法？Golang Tx.Rollback怎么用？Golang Tx.Rollback使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类github.com/jackc/pgx.Tx的用法示例。
在下文中一共展示了Tx.Rollback方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Golang代码示例。
示例1: assumePrimary
func (p *Process) assumePrimary(downstream *discoverd.Instance) (err error) {
log := p.log.New("fn", "assumePrimary")
if downstream != nil {
log = log.New("downstream", downstream.Addr)
}
if p.running() && p.config().Role == state.RoleSync {
log.Info("promoting to primary")
if err := ioutil.WriteFile(p.triggerPath(), nil, 0655); err != nil {
log.Error("error creating trigger file", "path", p.triggerPath(), "err", err)
return err
}
p.waitForSync(downstream, true)
return nil
}
log.Info("starting as primary")
if p.running() {
panic(fmt.Sprintf("unexpected state running role=%s", p.config().Role))
}
if err := p.initDB(); err != nil {
return err
}
if err := os.Remove(p.recoveryConfPath()); err != nil && !os.IsNotExist(err) {
log.Error("error removing recovery.conf", "path", p.recoveryConfPath(), "err", err)
return err
}
if err := p.writeConfig(configData{ReadOnly: downstream != nil}); err != nil {
log.Error("error writing postgres.conf", "path", p.configPath(), "err", err)
return err
}
if err := p.start(); err != nil {
return err
}
var tx *pgx.Tx
defer func() {
if err != nil {
if tx != nil {
tx.Rollback()
}
p.db.Close()
if err := p.stop(); err != nil {
log.Debug("ignoring error stopping postgres", "err", err)
}
}
}()
tx, err = p.db.Begin()
if err != nil {
log.Error("error acquiring connection", "err", err)
return err
}
if _, err := tx.Exec("SET TRANSACTION READ WRITE"); err != nil {
log.Error("error setting transaction read-write", "err", err)
return err
}
if _, err := tx.Exec(fmt.Sprintf(`
DO
$body$
BEGIN
IF NOT EXISTS (
SELECT * FROM pg_catalog.pg_user
WHERE usename = 'flynn')
THEN
CREATE USER flynn WITH SUPERUSER CREATEDB CREATEROLE REPLICATION PASSWORD '%s';
END IF;
END
$body$;
`, p.password)); err != nil {
log.Error("error creating superuser", "err", err)
return err
}
if err := tx.Commit(); err != nil {
log.Error("error committing transaction", "err", err)
return err
}
if downstream != nil {
p.waitForSync(downstream, true)
}
return nil
}