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VB（Visual Basic）是一種面向?qū)ο蟮母呒壋绦蛟O(shè)計(jì)語言，被廣泛應(yīng)用于Windows操作系統(tǒng)的軟件開發(fā)中。在軟件開發(fā)中，經(jīng)常需要使用數(shù)據(jù)庫存儲和管理數(shù)據(jù)，因此數(shù)據(jù)庫連接技巧是VB程序員必須掌握的基本技能。
本文將詳細(xì)介紹數(shù)據(jù)庫連接技巧，包括數(shù)據(jù)庫的概念、連接方法、連接字符串的編寫等方面，旨在幫助VB程序員更好地理解和應(yīng)用數(shù)據(jù)庫連接技巧。
一、數(shù)據(jù)庫的概念
數(shù)據(jù)庫是一種專門用于存儲、組織和管理數(shù)據(jù)的電子系統(tǒng)。它可以幫助用戶進(jìn)行數(shù)據(jù)的快速查找、添加、刪除、修改等操作，并可保證數(shù)據(jù)的安全性和完整性。
常見的數(shù)據(jù)庫類型包括關(guān)系型數(shù)據(jù)庫、面向?qū)ο髷?shù)據(jù)庫、層次型數(shù)據(jù)庫、網(wǎng)狀型數(shù)據(jù)庫等。在VB程序設(shè)計(jì)中，關(guān)系型數(shù)據(jù)庫被廣泛應(yīng)用，如SQL Server、Oracle、MySQL等。
二、數(shù)據(jù)庫連接方法
VB程序員可以使用多種方法連接數(shù)據(jù)庫，包括ADO、ODBC、DAO等。不同的連接方法具有各自的特點(diǎn)，程序員可以根據(jù)具體需求選擇合適的連接方式。
1. ADO連接方法
ADO（ActiveX Data Objects）是一種微軟公司開發(fā)的數(shù)據(jù)訪問技術(shù)，它提供一組COM組件，使程序員能夠通過OLE DB接口連接到各種不同的數(shù)據(jù)源。
ADO連接數(shù)據(jù)庫的基本步驟如下：
（1）創(chuàng)建Connection對象
Dim conn as new ADODB.Connection
（2）設(shè)置連接字符串
conn.ConnectionString =”Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\database\mydb.mdb”
（3）打開數(shù)據(jù)庫連接
conn.Open
2. ODBC連接方法
ODBC（Open Database Connectivity）是一種由微軟公司開發(fā)的開放式數(shù)據(jù)庫連接技術(shù)，它提供一種統(tǒng)一的接口，使不同的應(yīng)用程序可以連接到各種不同的數(shù)據(jù)庫。
ODBC連接數(shù)據(jù)庫的基本步驟如下：
（1）創(chuàng)建Connection對象
Dim conn as new ADODB.Connection
（2）設(shè)置連接字符串
conn.ConnectionString =”Driver={Microsoft Access Driver (*.mdb)};DBQ=C:\database\mydb.mdb”
（3）打開數(shù)據(jù)庫連接
conn.Open
3. DAO連接方法
DAO（Data Access Objects）是一種微軟公司開發(fā)的數(shù)據(jù)訪問技術(shù)，它提供一組COM組件，使程序員能夠通過Jet引擎連接Access數(shù)據(jù)庫。
DAO連接數(shù)據(jù)庫的基本步驟如下：
（1）創(chuàng)建DBEngine對象
Dim db as DAO.DBEngine
Set db = New DAO.DBEngine
（2）創(chuàng)建Database對象
Dim dbs as DAO.Database
Set dbs = db.OpenDatabase(“C:\database\mydb.mdb”)
（3）打開數(shù)據(jù)庫連接
dbs.OpenRecordset(“mytable”)
三、連接字符串的編寫
連接字符串是一種包含連接數(shù)據(jù)庫信息的文本字符串，通過它可以告訴程序連接數(shù)據(jù)庫的信息，如數(shù)據(jù)庫類型、服務(wù)器名稱、用戶名、密碼等。
在編寫連接字符串時(shí)，需要注意以下幾點(diǎn)：
1. 數(shù)據(jù)庫類型
不同類型的數(shù)據(jù)庫需要編寫不同的連接字符串，如Access數(shù)據(jù)庫：
“Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\database\mydb.mdb”
SqlServer數(shù)據(jù)庫：
“Provider=SQLOLEDB;Data Source=myserver;Initial Catalog=mydb;User ID=myuserid;Password=mypassword;”
2. 服務(wù)器名稱
如果連接遠(yuǎn)程服務(wù)器上的數(shù)據(jù)庫，需要指定服務(wù)器名稱和端口號。例如：
“Data Source=myserver\abc;Initial Catalog=mydb;User ID=myuserid;Password=mypassword;”
3. 用戶名和密碼
連接數(shù)據(jù)庫時(shí)，需要提供登錄名和密碼。如：
“Server=myserver;Database=mydb;User Id=myuserid;Password=mypassword;”
4. Windows身份驗(yàn)證
如果使用Windows身份驗(yàn)證，可以不提供用戶名和密碼。例如：
“Server=myserver;Database=mydb;Trusted_Connection=True;”
四、
VB程序員必須掌握數(shù)據(jù)庫連接技巧，才能更好地開發(fā)應(yīng)用程序。本文介紹了數(shù)據(jù)庫的概念、連接方法、連接字符串等方面，希望對程序員進(jìn)行有益的幫助。在實(shí)際開發(fā)中，程序員應(yīng)根據(jù)具體需求選擇合適的連接方式，并仔細(xì)編寫連接字符串，確保數(shù)據(jù)庫連接正常。
相關(guān)問題拓展閱讀：
- VB與各數(shù)據(jù)庫的幾種連接方式
- VB如何連接到數(shù)據(jù)庫
VB與各數(shù)據(jù)庫的幾種連接方式
－、用DAO控件連接數(shù)據(jù)庫1.與Access2023數(shù)據(jù)庫連接Private Sub Command1_Click()’也可直接在控件屬性中設(shè)置以下各項(xiàng)但在控件屬性中不能寫入密碼’只有在數(shù)據(jù)數(shù)沒有密碼的情況下可以省略Data1.RefreshData1.Connect = “Access 2023;”Data1.DatabaseName = App. Path + “/chncmadb.mdb”‘?dāng)?shù)據(jù)庫沒有密碼此句可省Data1.Connect = “;pwd=123456″‘Data1.RecordSource = “耕地資源管理單元屬性數(shù)據(jù)表羨攜虛2023” Data1.RecordSource = “select * from耕地資源管理單元屬性數(shù)據(jù)表2023″Data1.Refresh’move后才能正確顯示記錄個(gè)數(shù)End Sub2.與沒有密碼的DBF文件數(shù)據(jù)庫連接Private Sub Command2_Click()Data1.Connect = “dBASE III;”Data1.DatabaseName = App. Path’ Data1.RecordSource =”DBF”Data1.RecordSource = “select * from dbf”Data1.Refresh’move后才能正確顯示記錄個(gè)數(shù)End Sub3.與沒有密碼的Excel文件數(shù)據(jù)庫連接Private Sub Command3_Click()Data1.Connect = “Excel 8.0;”Data1.DatabaseName = App.Path & “/EXcel.xls”Data1.RecordSource = “select * from “Data1.Refresh’move后才能正確顯示記錄個(gè)End Sub 二、用DAO代碼連接數(shù)據(jù)庫’在使用DAO對象前應(yīng)選定Visual Basic菜單下的中的引用了菜單中的選隱模項(xiàng)，或其它版本1.DAO代碼與Access數(shù)據(jù)庫連接Private Sub Command1_Click()Dim Db As DatabaseDim Rs As Recordset’以共享、讀寫方式打開’如果無密碼最后一個(gè)參數(shù)可以不要Set Db= OpenDatabase(App.Path & “/chncmadb.mdb”, False, False, “;pwd=123456”)’不需要move來更新記錄個(gè)數(shù) ‘Set Rs = Db.OpenRecordset(“耕地資源管理單元屬性數(shù)據(jù)表2023”) ‘需要move來更新記錄個(gè)數(shù)Set Rs = Db.OpenRecordset(“select * from “)If Rs.RecordCount > 0 Then Rs.MoveLast Rs.MoveFirstEnd IfEnd Sub 2.DAO代碼與沒有密碼的DBF文件數(shù)據(jù)庫連接Private Sub Command2_Click()Dim Db As DatabaseDim Rs As Recordset’以共享、讀寫方式打開Set Db = OpenDatabase(App.Path, False, False, “dbase III;”) ‘不需要move來更新記錄個(gè)數(shù)’Set Rs = Db.OpenRecordset(“DBF”)’需要move來更新記錄個(gè)數(shù)Set Rs = Db.OpenRecordset(“select * from “) If Rs.RecordCount > 0 Then Rs.MoveLast Rs.MoveFirstEnd IfEnd sub 3. ‘DAO代碼與沒有密碼的Excel文件數(shù)據(jù)庫連接Private Sub Command3_Click()Dim Db As DatabaseDim Rs As Recordset’以共享、讀寫方式打開’如果無密碼最后一個(gè)參數(shù)可以不要Set Db = OpenDatabase(App.Path & “/EXcel.xls”, False, False, “Excel 8.0;”)’不需要move來更新記錄個(gè)數(shù) ‘ Set Rs = Db.OpenRecordset(“EXcel.xls”) ‘表格中的工兄燃作目錄sheet ‘需要move來更新記錄個(gè)數(shù)Set Rs = Db.OpenRecordset(“select * from “) ‘表格中的工作目錄sheet’If Rs.RecordCount > 0 Then Rs.MoveLast Rs.MoveFirstEnd IfEnd Sub 三、用ADO控件連接數(shù)據(jù)庫’也可直接在控件屬性中設(shè)置以下各項(xiàng)1.ADO控件與Access2023數(shù)據(jù)庫連接Private Sub Command1_Click() ‘連接有密碼的Access數(shù)據(jù)庫 ‘Adodc1.ConnectionString = “Provider=Microsoft.Jet.OLEDB.4.0;Data Source=” & App.Path & “/chncmadb1.mdb;Jet OLEDB:DataBase PASSWORD=123456” ‘連接沒有密碼的Access數(shù)據(jù)庫 Adodc1.ConnectionString = “Provider=Microsoft.Jet.OLEDB.4.0;Data Source=” & App.Path & “/chncmadb.mdb;Persist Security Info=False” ‘Adodc1.RecordSource = “” Adodc1.RecordSource = “select * from ” Adodc1.Refresh Set DataGrid1.DataSource = Adodc1 DataGrid1.RefreshEnd Sub 2.’ADO控件與DBF表連接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=2023;PageTimeout=5;” ‘能使表名長度不受限制 Adodc1.ConnectionString = “Provider=MSDASQL.1;Driver=Microsoft Visual Foxpro Driver;SourceDB=” & App.Path & “;SourceType=DBF;Locale Identifier=2023” ‘Adodc1.RecordSource = “” Adodc1.RecordSource = “select * from DBF1” Adodc1.Refresh Set DataGrid1.DataSource = Adodc1 DataGrid1.RefreshEnd Sub 3.’ADO控件與Excel表連接Private Sub Command3_Click() ‘下面一句測試未能通過 ‘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=2023;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 = “” Adodc1.RecordSource = “select * from ” Adodc1.Refresh Set DataGrid1.DataSource = Adodc1 DataGrid1.RefreshEnd Sub 4.’ADO控件與Oracle數(shù)據(jù)庫連接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 = “T320231TR012023” ‘表名不能加方括號 Adodc1.RecordSource = “select * from T320231TR012023” Adodc1.Refresh Set DataGrid1.DataSource = Adodc1 DataGrid1.RefreshEnd Sub 5.’ADO控件與SQLserver數(shù)據(jù)庫連接’未測試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 = “T320231TR012023” Adodc1.RecordSource = “select * from T320231TR012023” Adodc1.Refresh Set DataGrid1.DataSource = Adodc1 DataGrid1.RefreshEnd Sub 四、用ADO代碼連接數(shù)據(jù)庫’在使用ADO對象前應(yīng)選定Visual Basic菜單下的中的引用了菜單中的選項(xiàng)，或其它版本1.’ADO代碼與Access2023數(shù)據(jù)庫連接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后面的字符串可以參考ADO控件連接.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 “, AdoCnn, adOpenDynamic, adLockPessimistic, adCmdText Set DataGrid1.DataSource = AdoRs Set AdoRs = Nothing Set AdoCnn = NothingEnd Sub 2.’ADO代碼與DBF表連接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后面的字符串可以參考ADO控件連接.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=2023″AdoRs.Open “select * from “, AdoCnn, adOpenDynamic, adLockPessimistic, adCmdText Set DataGrid1.DataSource = AdoRs Set AdoRs = Nothing Set AdoCnn = NothingEnd Sub3.’ADO代碼與Excel表連接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后面的字符串可以參考ADO控件連接.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 “, AdoCnn, adOpenDynamic, adLockPessimistic, adCmdText Set DataGrid1.DataSource = AdoRs Set AdoRs = Nothing Set AdoCnn = NothingEnd Sub 4.’ADO代碼與Oracle數(shù)據(jù)庫連接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后面的字符串可以參考ADO控件連接.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 T320231TR012023”, AdoCnn, adOpenDynamic, adLockPessimistic, adCmdText Set DataGrid1.DataSource = AdoRs Set AdoRs = Nothing Set AdoCnn = NothingEnd Sub 5.’ADO代碼與SQLserver數(shù)據(jù)庫連接’未測試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后面的字符串可以參考ADO控件連接.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 T320231TR012023”, AdoCnn, adOpenDynamic, adLockPessimistic, adCmdText Set DataGrid1.DataSource = AdoRs Set AdoRs = Nothing Set AdoCnn = NothingEnd Sub
VB如何連接到數(shù)據(jù)庫
public
function
conopen()
as
sqlconnection
dim
str
as
string
str
=
“data
source=服務(wù)器名;initial
catalog=數(shù)據(jù)庫名;integrated
security=true”
dim
cn
as
new
sqlconnection(str)
cn.open()
return
cn
end
function
這個(gè)寫在模塊中，在你需告裂宏源慎要用的地方
dim
con
as
new
sqlconnection
con
=
conopen()
con就是數(shù)據(jù)連襪冊接
1樓的不錯，本人人補(bǔ)償下連接ACCESS和SQL server的
ACCESS：
Public conn As New Connection
Public Sub dbopen()
sdbname = App.Path + “\Database\ppower.mdb” ‘路徑
sPassword = “” ‘進(jìn)入數(shù)據(jù)庫的密碼
connstr = “Provider=Microsoft.Jet.OLEDB.4.0;” & “Persist Security Info=False;” & “Data Source=” & sdbname & “;” & “Jet OLEDB:Database Password=” & sPassword & “;”
conn.Open connstr ‘打開數(shù)據(jù)庫
If conn.ConnectionString = “” Then
MsgBox “數(shù)據(jù)庫連接錯誤”
Exit Sub
End If
End Sub
SQL SERVER
Option Explicit
Public g_Conn As Connection ‘用于全局的數(shù)據(jù)連接
Public g_DBPath As String ‘如果是Access數(shù)據(jù)庫，記錄下數(shù)據(jù)庫的路徑
‘ActiveX DLL的啟動程序，為DLL初始化春慶罩時(shí)執(zhí)行
Public Sub Main()
g_DBPath = App.Path & “\Database\ManageClient.mdb”
‘MsgBox g_DBPath
If ConnectToDatabase(DBAccess) = False Then
Err.Raise vbObjectError + 1, , “連接數(shù)據(jù)庫出錯！|” + App.Path + “|”
End If
End Sub
‘連接到數(shù)據(jù)庫
Public Function ConnectToDatabase(Dype As gxcDype) As Boolean
On Error GoTo ERR_CONN
Set g_Conn = New Connection
‘設(shè)置服務(wù)差慎器名稱，數(shù)據(jù)庫名稱，登錄名（此時(shí)假設(shè)密碼為空）
Dim ServerName As String, DBName As String, UserName As String, strPwd As String
‘這些是為連接Sql Server而用
ServerName = “l(fā)ocalhost”
DBName = “ManageClient”
UserName = “sa”
strPwd = “”
‘連接到數(shù)據(jù)庫
With g_Conn
.CursorLocation = adUseClient
.CommandTimeout = 10
If Dype = DBAccess Then
‘ 連接到ACCESS數(shù)據(jù)庫
.ConnectionString = “Provider=Microsoft.Jet.OLEDB.4.0;Password=”;” & _
“Data Source=” & g_DBPath
Else
‘ 連接到扒鬧SQL Server數(shù)據(jù)庫
.ConnectionString = “Provider=SQLOLEDB.1;Persist Security Info=True;” & _
“User ID=” & UserName & “;Initial Catalog=” & DBName & _
“;Data Source=” & ServerName & “;pwd=” & strPwd
End If
.Open
End With
ConnectToDatabase = True
Exit Function
ERR_CONN:
ConnectToDatabase = False
MsgBox Err.Description
End Function
很簡單，引仿耐用microsoft
ado
2.1(2.5,2.6,2.7,2.8都行），然后寫
dim
conn
as
new
adodb.connection
conn.open
“連接字符串，看你連接哪羨緩種數(shù)據(jù)庫了”
這就兄大模連上了
Public
Function
conopen()
As
SqlConnection
Dim
str
As
String
str
=
“Data
Source=服務(wù)器名;Initial
Catalog=數(shù)據(jù)庫名;Integrated
Security=True”
Dim
cn
As
New
SqlConnection(str)
cn.Open()
Return
cn
End
Function
這個(gè)寫在芹鉛冊模塊中，在你需要用的地方這樣寫
Dim
con
As
New
SqlConnection
con
=
conopen()
con就激叢是數(shù)據(jù)庫的連嫌宏接
VB有多種方法連接數(shù)據(jù)庫,不知道你想要怎么連? 還有要連接到什么樣的數(shù)據(jù)庫?
我這里給你提供個(gè)連接到Oracle的連接方法(利用oo4o).
Public OraDbSession As Object
Public OraDb As Object
Public myRs As Object
‘信衫連接數(shù)據(jù)庫(用戶名和密碼,數(shù)據(jù)庫名)
Function OraConn(UserID As String, Password As String, SouceName As String) As Boolean
On Error GoTo OraConn_Err
Set OraDbSession = CreateObject(“OracleInProcServer.XOraSession”)
Set OraDb = OraDbSession.dbopendatabase(SouceName, UserID & “/” & Password, 0)
OraConn = True
Exit Function
OraConn_Err:
OraConn = False
MsgBox Error
End Function
‘檢索(Select…)
Function BookFound() As Boolean
Dim SQL As String
SQL = “SELECT bookid FROM BOOK”
On Error GoTo BookFound_Err
‘這里是調(diào)用衡坦鉛上面那個(gè)函數(shù)
If Not OraConn(“用戶名咐好”, “密碼”, “數(shù)據(jù)庫名”) Then
BookFound = False
Exit Function
Else
Set myRs = OraDb.dbcreatedynaset(SQL, 0)
End If
Do While Not myds.EOF
MsgBox myds.fields(0).Value
myds.MoveNext
Loop
myds.Close
Exit Function
BookFound_Err:
MsgBox Error
End Function
‘更新/刪除/寫數(shù)據(jù)
Public Sub DateUp()
Dim sql As String
sql = “insert…”
‘這里是調(diào)用上面那個(gè)函數(shù)
If OraConn(“用戶名”, “密碼”, “數(shù)據(jù)庫名”) Then
OraDb.executesql (sql)
End If
End Sub
關(guān)于vb用戶數(shù)據(jù)庫連接的介紹到此就結(jié)束了，不知道你從中找到你需要的信息了嗎 ？如果你還想了解更多這方面的信息，記得收藏關(guān)注本站。
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分享文章：VB程序員必看：數(shù)據(jù)庫連接技巧詳解(vb用戶數(shù)據(jù)庫連接)
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