How to use database callback functions in Golang?
Jun 03, 2024 pm 02:20 PM
Using the database callback function in Golang can achieve: executing custom code after the specified database operation is completed. Add custom behavior through separate functions without writing additional code. Callback functions are available for insert, update, delete, and query operations. You must use the sql.Exec, sql.QueryRow, or sql.Query function to use the callback function.
#How to use database callback function in Golang?
In Golang, using database callback functions allows us to execute custom code after performing specific database operations. One of the benefits of this is that custom behavior can be easily added without writing a lot of extra code.
Here's how to use database callback function in Golang:
import (
"context"
"database/sql"
"fmt"
"log"
_ "github.com/go-sql-driver/mysql"
)
func main() {
// 連接到數(shù)據(jù)庫
db, err := sql.Open("mysql", "user:password@tcp(localhost:3306)/database_name")
if err != nil {
log.Fatal(err)
}
// 創(chuàng)建一個回調(diào)函數(shù)，在插入操作后打印一條消息
callback := func(ctx context.Context, result sql.Result) error {
affected, err := result.RowsAffected()
if err != nil {
return err
}
fmt.Printf("插入了 %d 行記錄\n", affected)
return nil
}
// 使用回調(diào)執(zhí)行插入操作
result, err := db.Exec("INSERT INTO table_name (column1, column2) VALUES (?, ?)", "value1", "value2", callback)
if err != nil {
log.Fatal(err)
}
// 處理結(jié)果
// ...
}In this example, we create a callback function that prints a message after the insert operation. We then use this callback function when performing an insert operation.
In addition to insert operations, callback functions can also be used for other database operations, such as updates, deletes, and queries.
It is worth noting that the callback function can only be used when using the sql.Exec, sql.QueryRow or sql.Query function. .
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