我正在学习VB.Net,并需要使用开源的System.Data.SQLite ADO.Net解决方案来处理SQLite数据库
我在HOWTO部分找到的示例只有C#。是否有人能提供一个简单的VB.Net示例,以便我能够学习如何在插入多个参数时使用事务?
顺便说一下,这是我正在努力的代码:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim SQLconnect As New SQLite.SQLiteConnection()
Dim SQLcommand As SQLite.SQLiteCommand
Dim SQLtransaction As SQLite.SQLiteTransaction
SQLconnect.ConnectionString = "Data Source=test.sqlite;"
SQLconnect.Open()
SQLcommand = SQLconnect.CreateCommand
SQLcommand.CommandText = "CREATE TABLE IF NOT EXISTS files (id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT, hash TEXT);"
SQLcommand.ExecuteNonQuery()
'================ INSERT starts here
SQLtransaction = SQLconnect.BeginTransaction()
Dim myparam As New SQLite.SQLiteParameter()
SQLcommand.CommandText = "INSERT INTO [files] ([name],[hash]) VALUES(?,?)"
SQLcommand.Parameters.Add(myparam)
'How to set all parameters? myparam.Value
SQLcommand.ExecuteNonQuery()
SQLtransaction.Commit()
'================ INSERT ends here
SQLcommand.CommandText = "SELECT id,name,hash FROM files"
'How to tell if at least one row?
Dim SQLreader As SQLite.SQLiteDataReader = SQLcommand.ExecuteReader()
While SQLreader.Read()
ListBox1.Items.Add(SQLreader(1))
End While
SQLcommand.Dispose()
SQLconnect.Close()
End Sub
谢谢。
编辑:对于那些感兴趣的人,这里有一些可行的代码:
SQLtransaction = SQLconnect.BeginTransaction()
SQLcommand.CommandText = "INSERT INTO files (name,hash) VALUES(@name,@hash)"
SQLcommand.Parameters.AddWithValue("@name", "myfile")
SQLcommand.Parameters.AddWithValue("@hash", "123456789")
SQLcommand.ExecuteNonQuery()
SQLtransaction.Commit()