vb怎么连接数据库，vb怎么连接数据库查询

街酒 2022-12-07 06:16:31 958

可以用ODBC数据源，添加一个SQL的。然后用VB里面的ADO部件和datagrid部件连接。

先在拖出的adodc部件右键设置属性，连接数据库。

再将datagrid连接到adodc就可以看到数据了。

VB与各数据库的几种连接方式

－、用DAO控件连接数据库1.与Access2000数据库连接Private Sub Command1_Click()'也可直接在控件属性中设置以下各项但在控件属性中不能写入密码'只有在数据数没有密码的情况下可以省略Data1.RefreshData1.Connect = "Access 2000;"Data1.DatabaseName = App. Path + "/chncmadb.mdb"'数据库没有密码此句可省Data1.Connect = ";pwd=123456"'Data1.RecordSource = "耕地资源管理单元属性数据表2004" Data1.RecordSource = "select * from耕地资源管理单元属性数据表2004"Data1.Refresh’move后才能正确显示记录个数End Sub2.与没有密码的DBF文件数据库连接Private Sub Command2_Click()Data1.Connect = "dBASE III;"Data1.DatabaseName = App. Path' Data1.RecordSource ="DBF"Data1.RecordSource = "select * from dbf"Data1.Refresh’move后才能正确显示记录个数End Sub3.与没有密码的Excel文件数据库连接Private Sub Command3_Click()Data1.Connect = "Excel 8.0;"Data1.DatabaseName = App.Path & "/EXcel.xls"Data1.RecordSource = "select * from [EXcel.xls]"Data1.Refresh’move后才能正确显示记录个End Sub 二、用DAO代码连接数据库'在使用DAO对象前应选定Visual Basic菜单下的[工程]中的引用了菜单中的[Microsoft DAO 3.6 Object Library]选项，或其它版本1.DAO代码与Access数据库连接Private Sub Command1_Click()Dim Db As DatabaseDim Rs As Recordset'以共享、读写方式打开'如果无密码最后一个参数可以不要Set Db= OpenDatabase(App.Path & "/chncmadb.mdb", False, False, ";pwd=123456")'不需要move来更新记录个数 'Set Rs = Db.OpenRecordset("耕地资源管理单元属性数据表2004") '需要move来更新记录个数Set Rs = Db.OpenRecordset("select * from [耕地资源管理单元属性数据表2004]")If Rs.RecordCount > 0 Then Rs.MoveLast Rs.MoveFirstEnd IfEnd Sub 2.DAO代码与没有密码的DBF文件数据库连接Private Sub Command2_Click()Dim Db As DatabaseDim Rs As Recordset'以共享、读写方式打开Set Db = OpenDatabase(App.Path, False, False, "dbase III;") '不需要move来更新记录个数'Set Rs = Db.OpenRecordset("DBF")’需要move来更新记录个数Set Rs = Db.OpenRecordset("select * from [DBF]") If Rs.RecordCount > 0 Then Rs.MoveLast Rs.MoveFirstEnd IfEnd sub 3. 'DAO代码与没有密码的Excel文件数据库连接Private Sub Command3_Click()Dim Db As DatabaseDim Rs As Recordset'以共享、读写方式打开'如果无密码最后一个参数可以不要Set Db = OpenDatabase(App.Path & "/EXcel.xls", False, False, "Excel 8.0;")'不需要move来更新记录个数 ' Set Rs = Db.OpenRecordset("EXcel.xls") '表格中的工作目录sheet '需要move来更新记录个数Set Rs = Db.OpenRecordset("select * from [EXcel.xls]") '表格中的工作目录sheet'If Rs.RecordCount > 0 Then Rs.MoveLast Rs.MoveFirstEnd IfEnd Sub 三、用ADO控件连接数据库'也可直接在控件属性中设置以下各项1.ADO控件与Access2000数据库连接Private Sub Command1_Click() '连接有密码的Access数据库 'Adodc1.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & App.Path & "/chncmadb1.mdb;Jet OLEDB:DataBase PASSWORD=123456" '连接没有密码的Access数据库 Adodc1.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & App.Path & "/chncmadb.mdb;Persist Security Info=False" 'Adodc1.RecordSource = "[耕地资源管理单元属性数据表2004]" Adodc1.RecordSource = "select * from [耕地资源管理单元属性数据表2004]" Adodc1.Refresh Set DataGrid1.DataSource = Adodc1 DataGrid1.RefreshEnd Sub 2.'ADO控件与DBF表连接Private Sub Command2_Click() 'Adodc1.ConnectionString = "Provider=MSDASQL.1;Persist Security Info=False;Data Source=dBASE Files;DBQ=" & App.Path & ";SourceType=DBF;" 'Adodc1.ConnectionString = "Provider=MSDASQL.1;Persist Security Info=False;Extended Properties=DSN=Visual FoxPro Tables;UID=;SourceDB=”& app.path &”;SourceType=DBF;Exclusive=No;BackgroundFetch=Yes;Collate=Machine;Null=Yes;Deleted=Yes;" 'Adodc1.ConnectionString = "Provider=MSDASQL.1;Persist Security Info=False;Extended Properties=DSN=dBASE Files;DBQ=”& app.path &”;;DefaultDir=”& app.path &”;DriverId=533;MaxBufferSize=2048;PageTimeout=5;" '能使表名长度不受限制 Adodc1.ConnectionString = "Provider=MSDASQL.1;Driver=Microsoft Visual Foxpro Driver;SourceDB=" & App.Path & ";SourceType=DBF;Locale Identifier=2052" 'Adodc1.RecordSource = "[DBF1]" Adodc1.RecordSource = "select * from DBF1" Adodc1.Refresh Set DataGrid1.DataSource = Adodc1 DataGrid1.RefreshEnd Sub 3.'ADO控件与Excel表连接Private Sub Command3_Click() '下面一句测试未能通过 'Adodc1.ConnectionString = "Data Provider=MSDASQL.1;driver=Microsoft Excel Driver *.xls);DBQ=" & App.Path & "/EXcel.xls" 'Adodc1.ConnectionString="Provider=MSDASQL.1;Persist Security Info=False;Extended Properties=DSN=Excel Files;DBQ=" & App.Path & "/EXcel.xls;DefaultDir=”&app.path &”;DriverId=790;MaxBufferSize=2048;PageTimeout=5;" Adodc1.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False;Data Source=" & App.Path & "/EXcel.xls;Extended Properties='Excel 8.0;HDR=Yes'" 'Adodc1.RecordSource = "[EXcel.xls]" Adodc1.RecordSource = "select * from [EXcel.xls]" Adodc1.Refresh Set DataGrid1.DataSource = Adodc1 DataGrid1.RefreshEnd Sub 4.'ADO控件与Oracle数据库连接Private Sub Command4_Click() 'Adodc1.ConnectionString = "Provider=MSDAORA.1;Password=chncmadb;User ID=chncmadb;Data Source=towebserver;Persist Security Info=True"Adodc1.ConnectionString="Provider=OraOLEDB.Oracle.1;Password=chncmadb;Persist Security Info=True;User ID=chncmadb;Data Source=towebserver" 'Adodc1.RecordSource = "T320481TR012004" '表名不能加方括号 Adodc1.RecordSource = "select * from T320481TR012004" Adodc1.Refresh Set DataGrid1.DataSource = Adodc1 DataGrid1.RefreshEnd Sub 5.'ADO控件与SQLserver数据库连接'未测试Private Sub Command5_Click() Adodc1.ConnectionString = "Provider=SQLOLEDB.1;Password=111;Persist Security Info=True;User ID=111;Initial Catalog=111;Data Source=111" 'Adodc1.RecordSource = "T320481TR012004" Adodc1.RecordSource = "select * from T320481TR012004" Adodc1.Refresh Set DataGrid1.DataSource = Adodc1 DataGrid1.RefreshEnd Sub 四、用ADO代码连接数据库'在使用ADO对象前应选定Visual Basic菜单下的[工程]中的引用了菜单中的[Microsoft.ActiveX Data Object 2.5 Library]选项，或其它版本1.'ADO代码与Access2000数据库连接Private Sub Command1_Click() Dim AdoCnn As ADODB.Connection Dim AdoRs As ADODB.Recordset Set AdoCnn = New ADODB.Connection Set AdoRs = New ADODB.Recordset AdoCnn.CursorLocation = adUseClient '.open后面的字符串可以参考ADO控件连接.ConnectionString后面的的字符串 AdoCnn.Open "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & App.Path & "/chncmadb1.mdb;Jet OLEDB:DataBase PASSWORD=123456"AdoRs.Open "select * from [耕地资源管理单元属性数据表2004]", AdoCnn, adOpenDynamic, adLockPessimistic, adCmdText Set DataGrid1.DataSource = AdoRs Set AdoRs = Nothing Set AdoCnn = NothingEnd Sub 2.'ADO代码与DBF表连接Private Sub Command2_Click() Dim AdoCnn As ADODB.Connection Dim AdoRs As ADODB.Recordset Set AdoCnn = New ADODB.Connection Set AdoRs = New ADODB.Recordset AdoCnn.CursorLocation = adUseClient '.open后面的字符串可以参考ADO控件连接.ConnectionString后面的的字符串 AdoCnn.Open "Provider=MSDASQL.1;Driver=Microsoft Visual Foxpro Driver;SourceDB=" & App.Path & ";SourceType=DBF;Locale Identifier=2052"AdoRs.Open "select * from [DBF1]", AdoCnn, adOpenDynamic, adLockPessimistic, adCmdText Set DataGrid1.DataSource = AdoRs Set AdoRs = Nothing Set AdoCnn = NothingEnd Sub3.'ADO代码与Excel表连接Private Sub Command3_Click() Dim AdoCnn As ADODB.Connection Dim AdoRs As ADODB.Recordset Set AdoCnn = New ADODB.Connection Set AdoRs = New ADODB.Recordset AdoCnn.CursorLocation = adUseClient '.open后面的字符串可以参考ADO控件连接.ConnectionString后面的的字符串 AdoCnn.Open"Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False;Data Source=" & App.Path & "/EXcel.xls;Extended Properties='Excel 8.0;HDR=Yes'"AdoRs.Open "select * from [EXcel.xls]", AdoCnn, adOpenDynamic, adLockPessimistic, adCmdText Set DataGrid1.DataSource = AdoRs Set AdoRs = Nothing Set AdoCnn = NothingEnd Sub 4.'ADO代码与Oracle数据库连接Private Sub Command4_Click() Dim AdoCnn As ADODB.Connection Dim AdoRs As ADODB.Recordset Set AdoCnn = New ADODB.Connection Set AdoRs = New ADODB.Recordset AdoCnn.CursorLocation = adUseClient '.open后面的字符串可以参考ADO控件连接.ConnectionString后面的的字符串 AdoCnn.Open "Provider=OraOLEDB.Oracle.1;Password=chncmadb;Persist Security Info=True;User ID=chncmadb;Data Source=towebserver"AdoRs.Open "select * from T320481TR012004", AdoCnn, adOpenDynamic, adLockPessimistic, adCmdText Set DataGrid1.DataSource = AdoRs Set AdoRs = Nothing Set AdoCnn = NothingEnd Sub 5.'ADO代码与SQLserver数据库连接'未测试Private Sub Command5_Click() Dim AdoCnn As ADODB.Connection Dim AdoRs As ADODB.Recordset Set AdoCnn = New ADODB.Connection Set AdoRs = New ADODB.Recordset AdoCnn.CursorLocation = adUseClient '.open后面的字符串可以参考ADO控件连接.ConnectionString后面的的字符串 AdoCnn.Open "Provider=SQLOLEDB.1;Password=111;Persist Security Info=True;User ID=111;Initial Catalog=111;Data Source=111"AdoRs.Open "select * from T320481TR012004", AdoCnn, adOpenDynamic, adLockPessimistic, adCmdText Set DataGrid1.DataSource = AdoRs Set AdoRs = Nothing Set AdoCnn = NothingEnd Sub

怎么如何用VB软件连接数据库