Roy Crihfield
3373b0c763
A lazy Tx object that caches statements, then builds/commits the whole underlying Tx at Commit()
56 lines
1.0 KiB
Go
56 lines
1.0 KiB
Go
package sql
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import (
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"context"
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)
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type DelayedTx struct {
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cache []cachedStmt
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db Database
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}
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type cachedStmt struct {
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sql string
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args []interface{}
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}
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func NewDelayedTx(db Database) *DelayedTx {
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return &DelayedTx{db: db}
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}
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func (tx *DelayedTx) QueryRow(ctx context.Context, sql string, args ...interface{}) ScannableRow {
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return tx.db.QueryRow(ctx, sql, args...)
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}
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func (tx *DelayedTx) Exec(ctx context.Context, sql string, args ...interface{}) (Result, error) {
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tx.cache = append(tx.cache, cachedStmt{sql, args})
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return nil, nil
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}
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func (tx *DelayedTx) Commit(ctx context.Context) error {
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base, err := tx.db.Begin(ctx)
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if err != nil {
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return err
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}
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defer func() {
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if p := recover(); p != nil {
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rollback(ctx, base)
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panic(p)
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} else if err != nil {
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rollback(ctx, base)
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}
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}()
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for _, stmt := range tx.cache {
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_, err := base.Exec(ctx, stmt.sql, stmt.args...)
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if err != nil {
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return err
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}
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}
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tx.cache = nil
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return base.Commit(ctx)
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}
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func (tx *DelayedTx) Rollback(ctx context.Context) error {
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tx.cache = nil
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return nil
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}
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