VB.NET 数据库表通用操作类模块

VB 前端之家
前端之家收集整理的这篇文章主要介绍了VB.NET 数据库表通用操作类模块，前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。

也可以浏览这里，有更详细的UML类视图描述

http://leek.woku.com/article/4859859.html

作者：段利庆 QQ：14035344

这个类模块主要有两个类模块通过继承的方法和实现这个类的接口，来方便的对数据库操作，同样也符合标准的软件设计模式。

基类

【DBbase】通用的数据库操作方法的集合

重要的方法：

【DBOperate】返回数据库表和执行查询的操作方法

【Delete】删除记录 创建派生类时 给保护字段sTable 得到表名称 就可以执行删除操作了

【XXX】其他的一些数据表处理方法

接口

【ITableOperate】

【AddNew】 添加记录 由派生类实现接口

【Update】更新记录 由派生类实现接口

'基类代码：

Public MustInherit Class DBbase

'*声明添加 和更新 记录的接口 注：删除记录的方法 由派生类继承
Public Interface ITableOperate
Sub AddNew()
Sub Update(ByVal ID As Long)
End Interface

'*可以在基类和派生类中访问
Protected sTable As String

'*【Overridable】关键字表式方法可以在派生类中重写
'Public Overridable Sub AddNew()

'End Sub

'Public Overridable Sub Update(ByVal ID As Long)

'End Sub

Public Overridable Sub Delete(ByVal ID As Long)

Dim strsql As String

'strsql = "DELETE FROM " & sTable & " " & _
' "WHERE 编号 = " & ID

strsql = "UPDATE " & sTable & " " & _
"SET 删除 = " & "1" & " " & _
"WHERE 编号 = " & ID

DBOperate(strsql)

End Sub

'*----------------------------------------------------------------------------
'*以下来自【DBOperation】

Public Function DBOperate(ByVal sqlString As String,Optional ByRef Msg As String = vbNullString) As DataTable
Try
Dim CONN As String
CONN = "Provider=Microsoft.Jet.OLEDB.4.0;Password="""";User ID=Admin;Data Source=" + Application.StartupPath + "/DataBase/LeeDB.mdb"
Dim oleconn As New OleDb.OleDbConnection(CONN)
Dim cmd As OleDb.OleDbCommand = New OleDb.OleDbCommand(sqlString,oleconn)
cmd.CommandType = CommandType.Text
Dim sTokens() As String
sTokens = sqlString.Split(" ")
If Strings.InStr("INSERT,DELETE,UPDATE",sTokens(0).ToUpper) Then
If oleconn.State <> ConnectionState.Open Then
oleconn.Open() '打开数据库连接
End If
cmd.ExecuteNonQuery() '执行sql语句
If oleconn.State <> ConnectionState.Closed Then
oleconn.Close() '关闭数据库连接
End If
If sTokens(0).ToUpper = "INSERT" Then
MsgBox("插入记录成功")
End If
If sTokens(0).ToUpper = "DELETE" Then
MsgBox("删除记录成功")
End If
If sTokens(0).ToUpper = "UPDATE" Then
MsgBox("更新记录成功")
End If
Return Nothing
Else
Dim ObjectdsDataSet As New DataSet()
Dim adapter As New OleDb.OleDbDataAdapter()
adapter.TableMappings.Add("Table","TEMP")
adapter.SelectCommand = cmd
If oleconn.State <> ConnectionState.Open Then
oleconn.Open() '打开数据库连接
End If
cmd.ExecuteNonQuery() '执行sql语句
If oleconn.State <> ConnectionState.Closed Then
oleconn.Close() '关闭数据库连接
End If
adapter.Fill(ObjectdsDataSet) '填充数据集
Return ObjectdsDataSet.Tables("TEMP")
End If
Catch
MsgBox(Err.Description)
End Try
End Function

Public Function QueryStr(ByVal Str_Renamed As String) As Object
'' ==========================================================
' 开发人员：段利庆
' 编写时间：06-5-23
' 过程名称：QueryStr
' 参数说明：str 待格式 的字符串

' 功能说明：返回 要过滤的查询字符串格式 例如： 'string'

'' ==========================================================
Dim pos As Integer
pos = InStr(Str_Renamed,"'")
While pos > 0
Str_Renamed = Mid(Str_Renamed,1,pos) & "'" & Mid(Str_Renamed,pos + 1)
pos = InStr(pos + 2,Str_Renamed,"'")
End While

'UPGRADE_WARNING: 未能解析对象 QueryStr 的默认属性。 单击以获得更多信息:“ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?keyword="6A50421D-15FE-4896-8A1B-2EC21E9037B2"”
QueryStr = "'" & Str_Renamed & "'"
End Function


Public Function DateTosqlstr(ByVal Date_Value As Date,Optional ByVal blnTime As Boolean = False) As String
'' ==========================================================
' 开发人员：段利庆
' 编写时间：05-6-26
' 函数名称：DateTosqlstr
' 参数说明：Date_Value 时间值
' blnTime 开始时间(False) 00:00:00点 或(True)23:59:59
' 功能说明：将日期值转换为SQL查询可用的字符串

'' ==========================================================
If Not blnTime Then
DateTosqlstr = "#" & Date_Value.Month & "-" & Date_Value.Day & "-" & Date_Value.Year & " 00:00:00#"
Else
DateTosqlstr = "#" & Date_Value.Month & "-" & Date_Value.Day & "-" & Date_Value.Year & " 23:59:59#"
End If

End Function

Public Function TimeTosqlstr(ByVal Date_Value As Date) As String
'' ==========================================================
' 开发人员：段利庆
' 编写时间：07-01-01
' 函数名称：TimeTosqlstr
' 参数说明：Date_Value 时间值
' 功能说明：将时间值转换为SQL查询可用的字符串

'' ==========================================================
TimeTosqlstr = "#" & Hour(Date_Value) & ":" & Minute(Date_Value) & ":" & Second(Date_Value) & "#"

End Function


Public Function DateTosqlstrServer(ByVal Date_Value As Date,Optional ByVal blnTime As Boolean = False) As String
'' ==========================================================
' 开发人员：段利庆
' 编写时间：05-6-26
' 函数名称：DateTosqlstr
' 参数说明：Date_Value 时间值
' blnTime 开始时间(False) 00:00:00点 或(True)23:59:59
' 功能说明：将日期值转换为SQL查询可用的字符串
' 适用于sql SERVER
'' ==========================================================
If Not blnTime Then
DateTosqlstrServer = "' " & Date_Value.Year & "-" & Date_Value.Month & "-" & Date_Value.Day & " 00:00:00" & "' "
Else
DateTosqlstrServer = "' " & Date_Value.Year & "-" & Date_Value.Month & "-" & Date_Value.Day & " 23:59:59" & "' "
End If

End Function

Public Sub QueryToLV(ByVal strsql As String,ByRef LV As ListView,Optional ByVal ImageID As Integer = 0)
'' ==========================================================
' 开发人员：段利庆
' 编写时间：09-07-10
' 过程名称：QueryToLV
' 参数说明：strsql 查询字符串
' Lv ListView
' ImageID 绑定ImageList的图标 ID号
' 功能说明：将查询结果导入到<ListView>

'' ==========================================================

Dim sqlString As String = strsql
Dim UserTable As DataTable = DBOperation.DBOperate(sqlString)

LV.Items.Clear()
LV.Columns.Clear()

LV.View = View.Details
LV.GridLines = True
LV.FullRowSelect = True

'*绑定主窗体上的【ImgLst】
LV.SmallImageList = FrmMain.ImgLst

Dim i As Integer
For i = 0 To UserTable.Columns.Count - 1
LV.Columns.Add(UserTable.Columns.Item(i).ColumnName)
Next

Dim RowCount As Integer
Dim RowName As String
Dim FidldsCount As Integer

Dim LItem As ListViewItem
For RowCount = 0 To UserTable.Rows.Count - 1
RowName = UserTable.Rows(RowCount).Item(0).ToString
'LV.Items.Add(RowName)
LItem = New ListViewItem(RowName,ImageID)
For FidldsCount = 1 To UserTable.Columns.Count - 1

LItem.SubItems.Add(UserTable.Rows(RowCount).Item(FidldsCount).ToString)

Next FidldsCount
LV.Items.Add(LItem)
Next RowCount
End Sub

Public Function GetRecordID(ByVal TableName As String,_
ByVal FieldName As String,_
ByVal FieldValue As String,_
ByVal IDName As String) As Long

'' ==========================================================
' 开发人员：段利庆
' 编写时间：2009-07-14
' 函数名称：GetRecordID
' 参数说明：TableName 表名称
' FieldName 字段名称
' FieldValue 字段值
' IDName 编号名称
' 功能说明：根据字段名称（数据库字段属性设为不重复）获得编号，应用于多表关系中

'' ==========================================================

On Error GoTo PROC_ERR

Dim strMessage As String
Dim strsql As String
Dim RcdCount As Long

strsql = "SELECT " & IDName & "," & FieldName & " " & _
"FROM " & TableName & " " & _
"WHERE " & FieldName & " = " & QueryStr(FieldValue)

Dim tTable As DataTable = DBOperation.DBOperate(strsql)

RcdCount = tTable.Rows.Count

If RcdCount = 0 Then
Debug.Print("记录表内 该名称的 字段 不存在")
Return -1
GoTo PROC_EXIT
End If

If RcdCount > 1 Then
Debug.Print("记录表内 该名称的 字段 有重复")
Return -1
GoTo PROC_EXIT
End If

Return tTable.Rows(0)(IDName)

PROC_EXIT:
Exit Function
PROC_ERR:
Call ShowError("DBbase","GetRecordID",Err.Number,Err.Description)
GoTo PROC_EXIT

End Function

Public Function GetRecordStr(ByVal TableName As String,_
ByVal IDValue As Long,_
ByVal IDName As String) As String

'' ==========================================================
' 开发人员：段利庆
' 编写时间：2009-07-14
' 函数名称：GetRecordStr
' 参数说明：TableName 表名称
' FieldName 字段名称
' IDValue 字段值
' IDName 编号名称
' 功能说明：根据字段[编号]（数据库字段属性设为不重复）获得字段字符值，应用于多表关系中

'' ==========================================================

'*中央错误处理
On Error GoTo PROC_ERR

Dim strMessage As String

Dim strsql As String
Dim RcdCount As Long '记录总数

strsql = "SELECT " & IDName & "," & FieldName & " " & _
"FROM " & TableName & " " & _
"WHERE " & IDName & " = " & IDValue

Dim tTable As DataTable = DBOperation.DBOperate(strsql)

RcdCount = tTable.Rows.Count

If RcdCount = 0 Then
Debug.Print("记录表内 该名称的 字段 不存在")
Return "Error Message ~~!!"
GoTo PROC_EXIT
End If

If RcdCount > 1 Then
Debug.Print("记录表内 该名称的 字段 有重复")
Return "Error Message ~~!!"
GoTo PROC_EXIT
End If

Return tTable.Rows(0)(FieldName)

PROC_EXIT:
Exit Function

PROC_ERR:
Call ShowError("DBbase","GetRecordStr",Err.Description)
GoTo PROC_EXIT

End Function

Public Function GetRecordCount(ByVal strsql As String) As Long

'' ==========================================================
' 开发人员：段利庆
' 编写时间：2009-07-22
' 函数名称：GetRecordCount
' 参数说明：strsql SLQ查询字符串

' 功能说明：得到查询的记录条数

'' ==========================================================

'*中央错误处理
On Error GoTo PROC_ERR

Dim strMessage As String
Dim RcdCount As Long '记录总数

Dim tTable As DataTable = DBOperation.DBOperate(strsql)

RcdCount = tTable.Rows.Count

Return RcdCount


PROC_EXIT:
Exit Function

PROC_ERR:
Call ShowError("DBbase","GetRecordCount",Err.Description)
GoTo PROC_EXIT

End Function

Public Sub LoadFieldToComb(ByVal TableName As String,_
ByVal Comb As ComboBox)

'' ==========================================================
' 开发人员：段利庆
' 编写时间：2009-07-20
' 过程名称：LoadFieldToComb
' 参数说明：TableName 表名称
' FieldName 字段名称
' Comb 要载入的下拉列表框控件
' 功能说明：将数据库的一个字段内容载入下拉列表框

'' ==========================================================

'*中央错误处理
On Error GoTo PROC_ERR

Dim strMessage As String
Dim strsql As String

strsql = "SELECT " & FieldName & " " & _
"FROM " & TableName

Dim RcdCount As Long '记录总数

Dim tTable As DataTable = DBOperation.DBOperate(strsql)

RcdCount = tTable.Rows.Count

If RcdCount = 0 Then
Debug.Print("记录表内 该名称的 字段 不存在")
GoTo PROC_EXIT
End If

Comb.Items.Clear()

Comb.DataSource = tTable

PROC_EXIT:
Exit Sub

PROC_ERR:
Call ShowError("DBbase","LoadFieldToComb",Err.Description)
GoTo PROC_EXIT

End Sub

Public Function GetMaxIndexVal(ByVal sTable As String,ByVal sField As String) As Long
'' ==========================================================
' 开发人员：段利庆
' 编写时间：2009-07-24
' 函数名称：GetMaxIndexVal
' 参数说明：sTable 表名称
' sField 字段名称 字段属性必须为数字

' 功能说明：获得表内最大的数字值， 防止添加有重复的字段值

'' ==========================================================

'*中央错误处理
On Error GoTo PROC_ERR

Dim strsql As String
Dim RcdCount As Long '记录总数

strsql = "SELECT Max(" & sField & ") AS MaxVal " & _
"FROM " & sTable & " "

Dim tTable As DataTable = DBOperation.DBOperate(strsql)
Return tTable.Rows(0)("MaxVal")

PROC_EXIT:
Exit Function

PROC_ERR:
Call ShowError("DBbase","GetMaxIndexVal",Err.Description)
Return -1
GoTo PROC_EXIT
End Function


End Class

'派生类代码：

Public Class DBMeterPrice

Inherits DBbase
'*实现对数据记录操作的接口
Implements DBbase.ITableOperate


Public ID As Long '编号
Public sCaption As String '名称
Public dPrice As Decimal '单价
Public sMemo As String '备注
Public bDelTag As Boolean '删除标记

Public Sub New()
Me.sTable = "计量仪表_价格"
End Sub

Public Sub Full(ByRef LV As ListView)

Dim strsql As String
strsql = "SELECT 编号 as _,名称,单价,备注,删除 " & _
"FROM 计量仪表_价格 " & _
"WHERE 删除 = 0 " & _
"ORDER BY 编号 "

Me.QueryToLV(strsql,LV)

End Sub

Public Sub AddNew() Implements DBbase.ITableOperate.AddNew

On Error GoTo PROC_ERR

Dim strMessage As String

Dim strsql As String
strsql = "SELECT 编号,删除 " & _
"FROM 计量仪表_价格 " & _
"WHERE 名称 = " & Me.QueryStr(Me.sCaption)

If Me.GetRecordCount(strsql) >= 1 Then
'*防止重复添加重复记录 在这里首先判断处理
strMessage = "顾客地址已经存在"
Debug.Print(strMessage)
MessageBox.Show(strMessage,"提示",MessageBoxButtons.OK,MessageBoxIcon.Exclamation)
GoTo PROC_EXIT
End If

Dim iMaxMeterID As Integer
iMaxMeterID = Me.GetMaxIndexVal(Me.sTable,"子表号") + 1

strsql = "INSERT INTO 计量仪表_价格(名称,子表号,删除 ) " & _
"VALUES( " & Me.QueryStr(Me.sCaption) & "," & _
iMaxMeterID & "," & _
Me.dPrice & "," & _
Me.QueryStr(Me.sMemo) & "," & _
"0" & ")"

DBOperate(strsql)

PROC_EXIT:
Exit Sub
PROC_ERR:
Call ShowError("DBMeterPrice","AddNew",Err.Description)
GoTo PROC_EXIT
End Sub

Public Sub Update(ByVal ID As Long) Implements DBbase.ITableOperate.Update

On Error GoTo PROC_ERR
Dim strMessage As String

Dim strsql As String
strsql = "UPDATE 计量仪表_价格 " & _
"SET 名称 = " & Me.QueryStr(Me.sCaption) & "," & _
"单价 = " & Me.dPrice.ToString & "," & _
"备注 = " & Me.QueryStr(Me.sMemo.ToString) & "," & _
"删除 = " & Me.bDelTag.ToString & " " & _
"WHERE 编号 = " & ID
'*因名称也是唯一的 故采用名称过滤也是可以的
'*采用【编号】过滤应该是最安全的

DBOperate(strsql)


PROC_EXIT:
Exit Sub
PROC_ERR:
Call ShowError("DBCustomer","Update",Err.Description)
GoTo PROC_EXIT

End SubEnd Class

猜你在找的VB相关文章

VB Format函数
Format[$] ( expr [ , fmt ] ) format 返回变体型 format$ 强制返回为文本 --------------...
vb6/ASP FORMAT MM/DD/YYYY
VB6或者ASP 格式化时间为 MM/dd/yyyy 格式，竟然没有好的办法， Format 或者FormatDateTi...
VB.net 捕获项目全局异常
在项目中添加如下代码：新建窗口来显示异常信息。 Namespace My ‘全局错误处理，新的...
实现用VB.Net/(C#)开发K/3 BOS 插件的真正可行方法
转了这一篇文章，原来一直想用C#做k3的插件开发，vb没有C#用的爽呀，这篇文章写与2011年，...
vb，wps，excel 分裂
Sub 分列() ‘以空格为分隔符，连续空格只算1个。对所选中的单元格进行处理 Dim m...
VB.NET MYSQL DataGridView 增删改查（INSERT,SELECT,UPDATE,DELETE）
  Imports MySql.Data.MySqlClient Public Class Form1 ‘ GLOBAL DECLARATIONS ...
VB.NET 使用ADODB連接資料庫滙出到EXCEL
‘導入命名空間 Imports ADODB Imports Microsoft.Office.Interop   Private Sub A1() Di...
vb.net 多线程運用 ping
Imports System.IO Imports System.Threading Imports System.Diagnostics Public Class F...
VB等待进程结束
VB运行EXE程序，并等待其运行结束 参考：https://blog.csdn.net/useway/article/details/5...
vb中去掉string数组的一部分
今天碰到一个问题，登陆的时候，如果不需要验证手机号为空，则不去验证手机号 因为登陆的时...
PHPJavaJava SEPythonC#C&C++RubyVBasp.NetGoPerlnettyDjangoDelphiJsp.NET CoreSpringFlaskSpringbootSpringMVCLuaLaravelMybatisAspGroovyThinkPHPYiiswoole
文件时间pythonm相等性PHP Warning时间问题问题解决pcntl_signal采样点wav模块动态文本调用频率限制对外暴露多个访问请求更新数据表模型结构type()方法比较速度手写体sobel算子保存模型Image类nn.Conv2dpytorch1.0kaggleDCGAN交并比range()用法打印模型反卷积卷积