main.frm

vb与access数据库的操作实例

VERSION 5.00
Object = "{67397AA1-7FB1-11D0-B148-00A0C922E820}#6.0#0"; "MSADODC.OCX"
Object = "{CDE57A40-8B86-11D0-B3C6-00A0C90AEA82}#1.0#0"; "MSDATGRD.OCX"
Object = "{F9043C88-F6F2-101A-A3C9-08002B2F49FB}#1.2#0"; "COMDLG32.OCX"
Begin VB.Form main 
   Caption         =   "查询分析器"
   ClientHeight    =   4485
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   9840
   LinkTopic       =   "Form1"
   ScaleHeight     =   4485
   ScaleWidth      =   9840
   StartUpPosition =   2  '屏幕中心
   Begin VB.ListBox List1 
      Height          =   3480
      Left            =   120
      TabIndex        =   6
      Top             =   840
      Width           =   1455
   End
   Begin VB.CommandButton Cmd_Exit 
      Caption         =   "退 出"
      Height          =   375
      Left            =   5880
      TabIndex        =   5
      Top             =   240
      Width           =   975
   End
   Begin MSComDlg.CommonDialog CommonDialog1 
      Left            =   1680
      Top             =   240
      _ExtentX        =   847
      _ExtentY        =   847
      _Version        =   393216
      DefaultExt      =   ".mdb"
      DialogTitle     =   "选择Access数据库"
      FileName        =   "*.mdb"
      InitDir         =   "d:\"
   End
   Begin MSAdodcLib.Adodc Adodc1 
      Height          =   375
      Left            =   7320
      Top             =   240
      Visible         =   0   'False
      Width           =   2415
      _ExtentX        =   4260
      _ExtentY        =   661
      ConnectMode     =   0
      CursorLocation  =   3
      IsolationLevel  =   -1
      ConnectionTimeout=   15
      CommandTimeout  =   30
      CursorType      =   3
      LockType        =   3
      CommandType     =   8
      CursorOptions   =   0
      CacheSize       =   50
      MaxRecords      =   0
      BOFAction       =   0
      EOFAction       =   0
      ConnectStringType=   1
      Appearance      =   1
      BackColor       =   -2147483643
      ForeColor       =   -2147483640
      Orientation     =   0
      Enabled         =   -1
      Connect         =   "Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False"
      OLEDBString     =   "Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False"
      OLEDBFile       =   ""
      DataSourceName  =   ""
      OtherAttributes =   ""
      UserName        =   ""
      Password        =   ""
      RecordSource    =   ""
      Caption         =   "Adodc1"
      BeginProperty Font {0BE35203-8F91-11CE-9DE3-00AA004BB851} 
         Name            =   "宋体"
         Size            =   9
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      _Version        =   393216
   End
   Begin MSDataGridLib.DataGrid DataGrid1 
      Height          =   2535
      Left            =   1680
      TabIndex        =   4
      Top             =   1800
      Width           =   8055
      _ExtentX        =   14208
      _ExtentY        =   4471
      _Version        =   393216
      HeadLines       =   1
      RowHeight       =   15
      BeginProperty HeadFont {0BE35203-8F91-11CE-9DE3-00AA004BB851} 
         Name            =   "宋体"
         Size            =   9
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      BeginProperty Font {0BE35203-8F91-11CE-9DE3-00AA004BB851} 
         Name            =   "宋体"
         Size            =   9
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      ColumnCount     =   2
      BeginProperty Column00 
         DataField       =   ""
         Caption         =   ""
         BeginProperty DataFormat {6D835690-900B-11D0-9484-00A0C91110ED} 
            Type            =   0
            Format          =   ""
            HaveTrueFalseNull=   0
            FirstDayOfWeek  =   0
            FirstWeekOfYear =   0
            LCID            =   2052
            SubFormatType   =   0
         EndProperty
      EndProperty
      BeginProperty Column01 
         DataField       =   ""
         Caption         =   ""
         BeginProperty DataFormat {6D835690-900B-11D0-9484-00A0C91110ED} 
            Type            =   0
            Format          =   ""
            HaveTrueFalseNull=   0
            FirstDayOfWeek  =   0
            FirstWeekOfYear =   0
            LCID            =   2052
            SubFormatType   =   0
         EndProperty
      EndProperty
      SplitCount      =   1
      BeginProperty Split0 
         BeginProperty Column00 
         EndProperty
         BeginProperty Column01 
         EndProperty
      EndProperty
   End
   Begin VB.TextBox txtSQL 
      Height          =   855
      Left            =   1680
      MultiLine       =   -1  'True
      ScrollBars      =   2  'Vertical
      TabIndex        =   3
      Top             =   840
      Width           =   8055
   End
   Begin VB.CommandButton Cmd_Clear 
      Caption         =   "清 空"
      Height          =   375
      Left            =   4320
      TabIndex        =   2
      Top             =   240
      Width           =   975
   End
   Begin VB.CommandButton Cmd_Execute 
      Caption         =   "执行查询"
      Height          =   375
      Left            =   2640
      TabIndex        =   1
      Top             =   240
      Width           =   975
   End
   Begin VB.CommandButton Cmd_SelectDB 
      Caption         =   "选择数据库"
      Height          =   375
      Left            =   240
      TabIndex        =   0
      Top             =   240
      Width           =   1215
   End
End
Attribute VB_Name = "main"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Cmd_Clear_Click()
  txtSQL = ""
End Sub

Private Sub Cmd_Execute_Click()
  If StrDBName = "" Or StrDBName = "*.mdb" Then '判断是否选择了数据库
    MsgBox ("请选择数据库")
    Exit Sub
  End If
  '判断是否为SELECT 语句，如果是则在DATAGRID中显示查询结果
  '每次只允许执行一条语句
  Dim StrSearch As String
  Dim m As Integer
  StrSearch = Trim(txtSQL)                      '读取SQL语句
  DB_Connect                                    '连接数据库
  SQLExt (StrSearch)                            '执行SQL语句
  '判断里面是否有SELECT关键字
  m = InStr(LCase(StrSearch), LCase("SELECT"))  '如果是SELECT语句，则将SELECT语句作为Adodc1控件的记录源
  If m > 0 Then
    Adodc1.ConnectionString = ConnStr
    Adodc1.RecordSource = StrSearch
    Adodc1.Refresh
    Set DataGrid1.DataSource = Adodc1           '在DataGrid1中显示结果
  End If
  MsgBox ("执行成功")
End Sub

Private Sub Cmd_Exit_Click()
  Unload Me
End Sub

Private Sub Cmd_SelectDB_Click()
  CommonDialog1.Filter = "Access数据库(*.mdb)"      '设置“打开”对话框的筛选条件
  CommonDialog1.ShowOpen                            '弹出“打开”对话框
  StrDBName = CommonDialog1.FileName                '将用户选择的数据库文件名保存到变量StrDBName中
  If StrDBName = "" Then                            '如果没有选择数据库，则显示提示信息并返回
    MsgBox ("请选择数据库")
    Exit Sub
  End If
  '设置连接字符串
  ConnStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + StrDBName + ";Persist Security Info=False"
  Dim rstSchema As New ADODB.Recordset              '定义记录集对象
  Dim i As Integer
  i = 0
  DB_Connect                                        '连接数据库
  Set rstSchema.ActiveConnection = cnn              '将记录集对象rstSchema绑定到连接对象cnn
  Set rstSchema = cnn.OpenSchema(adSchemaTables)    '获得数据库中表的信息到记录集rstSchema
    Do Until rstSchema.EOF                          '依次将记录集rstSchema中类型为表（TABLE）的记录读取到List1中
      If rstSchema!TABLE_TYPE = "TABLE" Then
        List1.AddItem rstSchema!TABLE_NAME, i
        i = i + 1
      End If
      rstSchema.MoveNext                            '移动记录指针
    Loop
  rstSchema.Close                                   '关闭记录集
  DB_Disconnect                                     '关闭数据库
End Sub