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我学习VB.Net,但需要使用开源System.Data.SQLite ADO.Net解决方案插入事务和参数?
我在HOWTO节中的实例和SQLite数据库的工作只在C#。有人会在VB.Net中有一个简单的例子,我可以学习如何在插入多个参数时使用事务?
FWIW,这里是我工作的代码:
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:对于那些有兴趣,这里的一些工作代码:
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()
谢谢你们。我找到一个使用SQLcommand.Parameters.AddWithValue()将项目添加到准备好的查询的示例。 – Gulbahar
很高兴知道,我一直在做“SqlCommand.Parameters.Add(new SqlParameter(name,value));” - 我可以节省一些打字的时间 - 谢谢:) –