VB.NET数据库另一种添加删除操作
第一步：定义一个属性类，以备其它方法使用Public Class MTarecls
'保持属性值的局部变量
Private mvarID As Integer 'ID
Private mvarSite As String '站点
Private mvarOperator As String '操作员
Private mvarMatter As String '提单号
Private mvarNowDate As Date '日期
Private mvarNotes As String '备注
Public Property ID() As Integer 'ID号
Get
Return mvarID
End Get
Set(ByVal value As Integer)
mvarID = value
End Set
End Property
Public Property Site() As String
Get
Return mvarSite
End Get
Set(ByVal Value As String)
mvarSite = Value
End Set
End Property
Public Property Worker() As String
Get
Return mvarOperator
End Get
Set(ByVal Value As String)
mvarOperator = Value
End Set
End Property
Public Property Matter() As String
Get
Return mvarMatter
End Get
Set(ByVal Value As String)
mvarMatter = Value
End Set
End Property
Public Property NowDate() As Date
Get
Return mvarNowDate
End Get
Set(ByVal Value As Date)
mvarNowDate = Value
End Set
End Property
Property Notes() As String
Get
Return mvarNotes
End Get
Set(ByVal value As String)
mvarNotes = value
End Set
End Property
End Class
第二步：Form操作方法
Public Class Form1
Dim mytest As New MTarecls
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
With mytest
.ID = 0
.Site = "2"
.Worker = "张三"
.Matter = ""
.NowDate = Now
.Notes = "fffffff"
End With
Dim Mobj As New Btarecls
Mobj.Insert(mytest)
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
With mytest
.ID = 1
.Site = "2"
.Worker = "李四"
.Matter = ""
.NowDate = Now
.Notes = "fffffff"
End With
Dim Mobj As New Btarecls
Mobj.Update(mytest)
End Sub
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
With mytest
.ID = 3
End With
Dim Mobj As New Btarecls
Mobj.Delete(1)
End Sub
Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
Dim mynew As ArrayList
Dim myT As MTarecls
Dim Myobj As New Btarecls
mynew = Myobj.Find("2")
If mynew Is Nothing Then
MsgBox("没有记录！")
Else
MsgBox(mynew.Count.ToString)
For i = 0 To mynew.Count - 1
myT = mynew.Item(i)
Console.WriteLine(myT.ID.ToString)
Next
End If
End Sub
Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
Dim Mynew As New MTarecls
Dim mObj As New Btarecls
Mynew = mObj.Find(2)
If Mynew Is Nothing Then
MsgBox("no recorder")
Else
MsgBox(Mynew.Worker.ToString)
End If
End Sub
End Class
第三步 定义一个操作方法类
Imports System.Data.OleDb
Public Class Btarecls
Public Const cTableName As String = "tbLog" 'Table
Public Const cID As String = "ID" 'ID
Public Const cSite As String = "站点" '站点
Public Const cOperator As String = "操作者" '操作员
Public Const cMatter As String = "事件" 'shijian
Public Const cNowDate As String = "日期" '日期
Public Const cNotes As String = "备注" '备注
Private CONNSTRING As String = Global.TestTare_ok.My.MySettings.Default.dbConnstring
Private Const SELECTSQL As String = "tbLogSelectCommand"
Private Const UPDATESQL As String = "tbLogUpdateCommand"
Private Const DELETESQL As String = "tbLogDeleteCommand" '"DELETE FROM tbTare WHERE ID=?"
Private Const INSERTSQL As String = "tbLogInsertCommand"
Private Const FINDSQL As String = "select * from tbLog where 站点=?"
' Private Const REPLYSQL As String = "ReplyMessage"
Private cnn As OleDbConnection
Private InsCmd As OleDbCommand
Private DelCmd As OleDbCommand
Private SelCmd As OleDbCommand
Private UpdCmd As OleDbCommand
Private FndCmd As OleDbCommand
Private DAdapter As OleDbDataAdapter
Private table As DataTable
Public Sub New()
createTable()
Initcmd()
End Sub
'在数据中按字段要求建一个表
Private Sub createTable()
table = New DataTable(cTableName)
Dim dt As DataTable = table
'生成器表的主键列，自动增量
Dim Column As DataColumn = dt.Columns.Add(cID, GetType(System.Int32))
Column.AllowDBNull = False
Column.AutoIncrement = True
Dim pkeys(0) As DataColumn
pkeys(0) = Column
dt.PrimaryKey = pkeys
dt.Columns.Add(cSite, GetType(System.String)).AllowDBNull = True
dt.Columns.Add(cOperator, GetType(System.String)).AllowDBNull = True
dt.Columns.Add(cMatter, GetType(System.String)).AllowDBNull = True
dt.Columns.Add(cNowDate, GetType(System.DateTime)).AllowDBNull = True
dt.Columns.Add(cNotes, GetType(System.String)).AllowDBNull = True
End Sub
'初始化各命令及适配器
Private Sub Initcmd()
Me.cnn = New OleDbConnection(CONNSTRING)
getInsCmd()
getUpdCmd()
getSelCmd()
getDelCmd()
getFndCmd()
'DAdapter
'
Me.DAdapter = New OleDbDataAdapter
Me.DAdapter.DeleteCommand = Me.DelCmd
Me.DAdapter.InsertCommand = Me.InsCmd
Me.DAdapter.SelectCommand = Me.SelCmd
Me.DAdapter.UpdateCommand = Me.UpdCmd
Me.DAdapter.TableMappings.AddRange( _
New System.Data.Common.DataTableMapping() { _
New System.Data.Common.DataTableMapping("Table", cTableName, _
New System.Data.Common.DataColumnMapping() { _
New System.Data.Common.DataColumnMapping(cID, cID), _
New System.Data.Common.DataColumnMapping(cSite, cSite), _
New System.Data.Common.DataColumnMapping(cOperator, cOperator), _
New System.Data.Common.DataColumnMapping(cMatter, cMatter), _
New System.Data.Common.DataColumnMapping(cNowDate, cNowDate), _
New System.Data.Common.DataColumnMapping(cNotes, cNotes) _
})})
End Sub
Private Sub openConnection()
If cnn Is Nothing Then
cnn = New OleDbConnection(CONNSTRING)
End If
If cnn.State <> ConnectionState.Open Then
cnn.Open()
End If
End Sub
'建立SelectCommand对象
Private Sub getSelCmd()
If SelCmd Is Nothing Then
SelCmd = New OleDbCommand(SELECTSQL, cnn)
SelCmd.CommandType = CommandType.StoredProcedure
SelCmd.Parameters.AddRange(New OleDbParameter() { _
New OleDbParameter(cID, OleDbType.Integer, 0, cID)})
''New OleDbParameter(C_SHIP, OleDbType.VarChar, 0, C_SHIP), _
''New OleDbParameter(C_LUSHU, OleDbType.Single, 0, C_LUSHU), _
'New OleDbParameter(C_pkid, OleDbType.VarChar, 0, C_pkid) _
' })
End If
End Sub
'建立InsertCommand对象
Private Sub getInsCmd()
If InsCmd Is Nothing Then
InsCmd = New OleDbCommand(INSERTSQL, cnn)
InsCmd.CommandType = CommandType.StoredProcedure
Me.InsCmd.Parameters.AddRange(New OleDbParameter() { _
New OleDbParameter(cID, OleDbType.Integer, 0, cID), _
New OleDbParameter(cSite, OleDbType.VarChar, 0, cSite), _
New OleDbParameter(cOperator, OleDbType.VarChar, 0, cOperator), _
New OleDbParameter(cMatter, OleDbType.VarChar, 0, cMatter), _
New OleDbParameter(cNowDate, OleDbType.DBTimeStamp, 0, cNowDate), _
New OleDbParameter(cNotes, OleDbType.VarChar, 0, cNotes)})
End If
End Sub
'建立UpdateCommand对象
Private Sub getUpdCmd()
If UpdCmd Is Nothing Then
UpdCmd = New OleDbCommand(UPDATESQL, cnn)
UpdCmd.CommandType = CommandType.StoredProcedure
Me.UpdCmd.Parameters.AddRange(New OleDbParameter() { _
New OleDbParameter(cID, OleDbType.Integer, 0, cID), _
New OleDbParameter(cSite, OleDbType.VarChar, 0, cSite), _
New OleDbParameter(cOperator, OleDbType.VarChar, 0, cOperator), _
New OleDbParameter(cMatter, OleDbType.VarChar, 0, cMatter), _
New OleDbParameter(cNowDate, OleDbType.DBTimeStamp, 0, cNowDate), _
New OleDbParameter(cNotes, OleDbType.VarChar, 0, cNotes)})
End If
End Sub
'建立DeleteCommand对象
Private Sub getDelCmd()
If DelCmd Is Nothing Then
DelCmd = New OleDbCommand(DELETESQL, cnn)
DelCmd.CommandType = CommandType.StoredProcedure
DelCmd.Parameters.AddRange(New OleDbParameter() { _
New OleDbParameter(cID, OleDbType.Integer, 0, cID)})
End If
End Sub
'建立FindCommand对象
Private Sub getFndCmd()
If FndCmd Is Nothing Then
FndCmd = New OleDbCommand(FINDSQL, cnn)
FndCmd.CommandType = CommandType.Text
FndCmd.Parameters.AddRange(New OleDbParameter() { _
New OleDbParameter(cSite, OleDbType.VarChar, 0)})
'New OleDbParameter(cTravelNo, OleDbType.VarChar, 0), _
'New OleDbParameter(cLOnes, OleDbType.Integer, 0)
End If
End Sub
'向数据库中增加一个供应商实体对象
Function Insert(ByVal s As MTarecls) As Boolean
'打开连接
openConnection()
getInsCmd() '获取一个Insert的Command对象
Try
With InsCmd
'填写存储过程所需要的参数
.Parameters(cID).Value = s.ID
.Parameters(cSite).Value = s.Site
.Parameters(cOperator).Value = s.Worker
.Parameters(cMatter).Value = s.Matter
.Parameters(cNowDate).Value = s.NowDate
.Parameters(cNotes).Value = s.Notes
'执行Insert操作
.ExecuteNonQuery()
End With
Return True
Catch ex As Exception
MessageBox.Show(ex.Message)
Return False
End Try
End Function
'修改某个供应商实体信息
Function Update(ByVal s As MTarecls) As Boolean
'打开连接
openConnection()
'生成Update的Command对象
getUpdCmd()
Try
With UpdCmd
'填写存储过程所需要的参数
.Parameters(cID).Value = s.ID
.Parameters(cSite).Value = s.Site
.Parameters(cOperator).Value = s.Worker
.Parameters(cMatter).Value = s.Matter
.Parameters(cNowDate).Value = s.NowDate
.Parameters(cNotes).Value = s.Notes
'执行Insert操作
.ExecuteNonQuery()
End With
Return True
Catch ex As Exception
MessageBox.Show(ex.Message)
Return False
End Try
End Function
'从数据库中删除某个供应商实价体
Function Delete(ByVal s As Integer) As Boolean
openConnection()
getDelCmd()
Try
With DelCmd
.Parameters(cID).Value = s
.ExecuteNonQuery()
End With
Return True
Catch ex As Exception
MessageBox.Show(ex.Message)
Return False
End Try
End Function
'从数据库个按条件进行查询某个供应商实价体
Function Find(ByVal pSite As String) As ArrayList ' MTarecls
openConnection()
getFndCmd()
With FndCmd
.Parameters(cSite).Value = pSite
'.Parameters(cTravelNo).Value = pTravelNo
'.Parameters(cLOnes).Value = pLOnes
End With
Dim dr As OleDbDataReader = FndCmd.ExecuteReader
Dim al As New ArrayList
Dim c As MTarecls
Dim i As Integer
Try
While dr.Read
c = New MTarecls
c.ID = dr(cID)
c.Site = dr(cSite)
c.Worker = dr(cOperator)
c.Matter = dr(cMatter)
c.NowDate = dr(cNowDate)
c.Notes = dr(cNotes)
i = i + 1
al.Add(c)
End While
If i >= 1 Then
Return al
Else
Return Nothing
End If
Catch ex As Exception
MessageBox.Show(ex.Message)
Return Nothing
Finally
dr.Close()
End Try
End Function
Function Find(ByVal sID As Integer) As MTarecls '按序号查询只有唯一值
openConnection()
getSelCmd()
With SelCmd
.Parameters(cID).Value = sID
'.Parameters(C_SHIP).Value = s.Ship
'.Parameters(C_LUSHU).Value = s.LuShu
'.Parameters(C_STATION).Value = s.Station
End With
Dim dr As OleDbDataReader = SelCmd.ExecuteReader
Dim al As New ArrayList
Dim c As MTarecls
Dim i As Integer
Try
While dr.Read
c = New MTarecls
c.ID = dr(cID)
c.Site = dr(cSite)
c.Worker = dr(cOperator)
c.Matter = dr(cMatter)
c.NowDate = dr(cNowDate)
c.Notes = dr(cNotes)
i = i + 1
al.Add(c)
End While
If i >= 1 Then
Return c
Else
Return Nothing
End If
Catch ex As Exception
MessageBox.Show(ex.Message)
Return Nothing
Finally
dr.Close()
End Try
End Function
End Class