Go language and MySQL database: how to perform data transactions?

Nowadays Internet applications need to process data. You may encounter the following situations when processing data:

1. You want to insert a record, but one of the columns does not meet the requirements, or the insertion will cause database inconsistency.
2. Perform a series of operations. If an error occurs in one of them, all previous operations need to be rolled back.
3. Multiple users perform the same operation at the same time. Without control, dirty reads and non-repeatable reads are prone to occur.

At this time we need to perform transaction processing to ensure that the database can maintain the integrity and consistency of the data. Let's take a look at how to perform transaction processing on the MySQL database in the Go language.

1. Connecting to the database

When using Go language for MySQL database transaction processing, you first need to establish a connection with the MySQL database. We can use the "database/sql" package to connect. The specific code is as follows:

import (
    "database/sql"
    _ "github.com/go-sql-driver/mysql"
)

func main() {
    db, err := sql.Open("mysql", "root:password@tcp(127.0.0.1:3306)/database_name")
    if err != nil {
        fmt.Printf("连接数据库错误: ", err)
    }
    defer db.Close()
}

Among them, "root" represents the MySQL user name, "password" represents the MySQL password, and "127.0.0.1:3306" is The IP address and port number of MySQL, and "database_name" is the name of the connected database.

2. Start transaction

After completing the database connection through the above code, we need to start a new transaction. To start a new transaction, we can use the db.Begin() method, as follows:

tx, err := db.Begin()
if err != nil {
    fmt.Println("开始事务错误: ", err)
}

This code will return a Tx type transaction object, which we can use to perform rollback operations.

3. Execute SQL statements

When we need to perform valid SQL operations, we can execute the corresponding SQL statements through the tx.Exec() method, as shown below:

result, err := tx.Exec("INSERT INTO users (name, age, sex) values (?, ?, ?)", "张三", 18, "男")
if err != nil {
    fmt.Println("插入错误: ", err)
    tx.Rollback()
}

Among them,? It is a placeholder and will be replaced by the value during specific execution. Information such as the number of rows affected by the operation and the auto-incremented ID can be obtained through the result object returned by the tx.Exec() method.

4. Commit transaction

According to the above code, we perform error handling when executing the SQL statement. If an error occurs, the transaction needs to be rolled back. After the transaction operation is completed, we need to submit the transaction through the tx.Commit() method, as shown below:

if err := tx.Commit(); err != nil {
    fmt.Println("提交事务错误: ", err)
    tx.Rollback()
}

When submitting the transaction through the tx.Commit() method, if the submission fails, a rollback operation is required to maintain Data integrity and consistency.

5. Summary

Through the above steps, we can conclude that the Go language is used for transaction processing of the MySQL database. Among them, operations such as establishing a connection with MySQL, starting a transaction, executing SQL statements, and submitting transactions are required to ensure data integrity and consistency.

The above is an article about data transaction processing between Go language and MySQL database, showing the main steps and methods. I hope this article can be helpful to you in transaction processing of MySQL database in Go language.

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