Development using MySQL and VB.NET: How to implement transaction processing functions

Development using MySQL and VB.NET: How to implement transaction processing function

Introduction:
In software development, transaction processing is a very important function. A transaction refers to a set of database operations that are considered an indivisible unit of work and are either all executed successfully or all failed and rolled back. Using transactions in your application ensures data consistency and integrity. This article will introduce how to use MySQL and VB.NET to develop and implement transaction processing functions.

1. Environment preparation:

1. Install the MySQL database and create a database named test.
2. Create a table named student, which contains two fields: id and name.

2. VB.NET code example:

Imports MySql.Data.MySqlClient

Public Class Form1

    Private Sub BtnSubmit_Click(sender As Object, e As EventArgs) Handles BtnSubmit.Click
        ' 获取输入的id和name
        Dim id As Integer = CInt(TxtId.Text)
        Dim name As String = TxtName.Text

        ' 建立数据库连接
        Dim connStr As String = "server=localhost;user=root;database=test;port=3306;password=123456;"
        Dim conn As New MySqlConnection(connStr)

        Try
            ' 打开数据库连接
            conn.Open()

            ' 开始事务
            Dim transaction As MySqlTransaction = conn.BeginTransaction()

            Try
                ' 执行SQL语句插入数据
                Dim sqlInsert As String = "INSERT INTO student (id, name) VALUES (@id, @name)"
                Dim cmdInsert As New MySqlCommand(sqlInsert, conn)
                cmdInsert.Parameters.AddWithValue("@id", id)
                cmdInsert.Parameters.AddWithValue("@name", name)
                cmdInsert.ExecuteNonQuery()

                ' 提交事务
                transaction.Commit()

                MsgBox("数据插入成功！")
            Catch ex As Exception
                ' 回滚事务
                transaction.Rollback()

                MsgBox("数据插入失败：" & ex.Message)
            End Try

        Catch ex As Exception
            MsgBox("数据库连接失败：" & ex.Message)
        Finally
            ' 关闭数据库连接
            conn.Close()
        End Try
    End Sub

End Class

3. Code analysis:

1. IntroductionMySql.Data.MySqlClient Namespace to use MySQL database related classes.
2. In the button's click event handler, obtain the id and name entered by the user.
3. Establish a database connection and specify the connection string connStr.
4. Open the database connection.
5. Open the transaction and call conn.BeginTransaction() to start the transaction.
6. Perform database operations in a transaction. Here, inserting data is used as an example. Parameterized queries are used to prevent SQL injection attacks.
7. If the database operation is successful, call transaction.Commit() to commit the transaction, otherwise call transaction.Rollback() to roll back the transaction.
8. Finally close the database connection.

4. Summary:
This article introduces how to use MySQL and VB.NET to develop and implement transaction processing functions. By starting transactions, performing database operations, and committing or rolling back transactions, you can ensure the consistency and integrity of database operations. In practical applications, it can be expanded and optimized according to specific needs. I hope this article can help developers implement transaction processing functions.

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