GO Tx.ExecContext用法及代碼示例

package main

import (
    "context"
    "database/sql"
    "log"
)

var (
    ctx context.Context
    db  *sql.DB
)

func main() {
    tx, err := db.BeginTx(ctx, &sql.TxOptions{Isolation: sql.LevelSerializable})
    if err != nil {
        log.Fatal(err)
    }
    id := 37
    _, execErr := tx.ExecContext(ctx, "UPDATE users SET status = ? WHERE id = ?", "paid", id)
    if execErr != nil {
        if rollbackErr := tx.Rollback(); rollbackErr != nil {
            log.Fatalf("update failed: %v, unable to rollback: %v\n", execErr, rollbackErr)
        }
        log.Fatalf("update failed: %v", execErr)
    }
    if err := tx.Commit(); err != nil {
        log.Fatal(err)
    }
}