vb操作sql数据库
方法1，
建立一个模块
将工程的启动设置为 SUB MAIN
在模块里写下面代码
Public db As Database
Public rs As Recordset
Sub main()
set db=db.opendatabase("数据库路径"<建议用相对路径--就是把数据库文件和工程文件放在同一目录下--相对路径就是APP.PATH+"数据库名带后缀">)
第一启动窗体<比如：form1>.show
end sub
以后在其他窗体中如果要调用数据库只用在窗体中写代码
set rs=openrecordset(<可以是数据库的表--如"student",也可以是查询语句--如"select* form student">)
这时数据库的内容都存在FILE集合里
比方说set rs=openrecordset("select* form student")
rs.file(0)就是SQL语句查询结果的第一列
rs.files就是整个结果
使用text1.text=rs.file(0)就可以把文本框于查询结果帮定起来
如果要对数据库进行修这时用以下代码：
db.Execute （<SQL语句--如"insert into student(sno,sname) value("","")">)
方法2，
工程--部件--选择microsoft data bound grid control 5.0
然后在窗体中添加左边工具栏的 DATA 和DBGRID 控件
选择DBGRID 将属性DATASOURCE 设置为DATA控件的名字（如DATA1）
然后选择DATA 将属性CONNECT设置为ACCESSS 2000
设置DATABASENAME 选择数据库的存放路径
最后设置RECORDSET 为需要连接的表的名字
运行就可以看到 DATAGRID中显示了数据库的信息
Ⅱ 怎么在VB中调用SQL数据库，数据库已经建好，越详细越好.
Public Function ConnectString() _
As String
ConnectString = "FileDSN=info.dsn;UID=sa;PWD=23" '连接字符器，改成你自己的
End Function
Public Function ExecuteSQL(ByVal SQL _
As String, MsgString As String) _
As ADODB.Recordset '这里是执行SQL语句，你只需要调用这个方法，把SQL查询语句参数传进来，最后返回一个Recordset
Dim cnn As ADODB.Connection
Dim rst As ADODB.Recordset
Dim sTokens() As String
On Error GoTo ExecuteSQL_Error
sTokens = Split(SQL)
Set cnn = New ADODB.Connection
cnn.Open ConnectString
If InStr("INSERT,DELETE,UPDATE", _
UCase$(sTokens(0))) Then
cnn.Execute SQL
MsgString = sTokens(0) & _
" query successful"
Else
Set rst = New ADODB.Recordset
rst.Open Trim$(SQL), cnn, _
adOpenKeyset, _
adLockOptimistic
'rst.MoveLast 'get RecordCount
Set ExecuteSQL = rst
MsgString = "查询到" & rst.RecordCount & _
" 条记录 "
End If
ExecuteSQL_Exit:
Set rst = Nothing
Set cnn = Nothing
Exit Function
ExecuteSQL_Error:
MsgString = "查询错误: " & _
Err.Description
Resume ExecuteSQL_Exit
End Function
Public Function Testtxt(txt As String) As Boolean
If Trim(txt) = "" Then
Testtxt = False
Else
Testtxt = True
End If
End Function
Ⅲ VB如何连接SQL数据库
一个用VB连接SQL数据库连接的模块2007年01月22日 星期一 下午 05:29下面是一个连接数据库的模块，大家可以使用它来连接SQL数据库，使用起来比ADO控件还简单：
代码如下：
Public rsNew As ADODB.Recordset
Public CnNew As ADODB.Connection
Public addFlag As Boolean
'连接数据库
Public Function OpenCn() As Boolean
Dim Mag As String
On Error GoTo strErrMag
Set CnNew = New ADODB.Connection
CnNew.ConnectionTimeout = 25
CnNew.Provider = "sqloledb"
CnNew.Properties("data source").value = "" 'SQL服务器的名
CnNew.Properties("initial catalog").value = "pubs"'库名
CnNew.Properties("integrated security").value = "SSPI"'登陆类型
'con.Properties("user id").value = "sa"
'con.Properties("password").value = "wwww"
CnNew.Open
OpenCn = True
addFlag = True
Exit Function
strErrMag:
Mag = "数据库末连接"
Call MsgBox(Mag, vbOKCancel, "错误:数据库连接")
addFlag = False
End
End Function
Public Sub Clocn()
'闭关数据库
On Error Resume Next
If CnNew.State <> adStateClosed Then CnNew.Close
Set CnNew = Nothing
End Sub
Public Function OpenRs(ByVal strSql As String) As Boolean
'连接数据库记录集
Dim Mag As String
Dim rpy As Boolean
On Error GoTo strErrMag
Set rsNew = New ADODB.Recordset
If addFlag = False Then rpy = OpenCn
With rsNew
.ActiveConnection = CnNew
.CursorLocation = adUseClient
.CursorType = adOpenKeyset
.LockType = adLockOptimistic
.Open strSql
End With
addFlag = True
OpenRs = True
Exit Function
strErrMag:
Mag = "数据库数据集末连接"
Call MsgBox(Mag, vbOKOnly, "错误:数据库连接")
OpenRs = False
End
End Function
Public Sub cloRs()
'闭关数据集
On Error Resume Next
If rsNew.State <> adStateClosed Then rsNew.Close
Set rsNew = Nothing
End Sub
只要在你的标准模块中加入该代码，你就可以使用其中的函数来连接数据源了。
Ⅳ VB连接SQL数据库具体操作
Option Explicit
Private Function Selectsql(SQL As String) As ADODB.Recordset '返回ADODB.Recordset对象
Dim ConnStr As String
Dim Conn As ADODB.Connection
Dim rs As ADODB.Recordset
Set rs = New ADODB.Recordset
Set Conn = New ADODB.Connection
'On Error GoTo MyErr:
ConnStr = "Provider=SQLOLEDB.1;Persist Security Info=True;User ID=登录数据库用户名(默认为sa);Password=登录数据库密码;Initial Catalog=数据库名;Data Source=服务器名(默认为:MERRYCHINA)" '这是连接SQL数据库的语句
Conn.Open ConnStr
rs.CursorLocation = adUseClient
rs.Open Trim$(SQL), Conn, adOpenDynamic, adLockOptimistic
Set Selectsql = rs
'Exit Function
'MyErr:
'Set rs = Nothing
'Set Conn = Nothing '释放相关的系统资源
'MsgBox Err.Description, vbInformation, "系统提示" '显示出错信息
End Function
Private Sub Form_Load()
Dim SQL As String
Dim rs As ADODB.Recordset
Dim X As Long
On Error GoTo Err_box
SQL = " select * from 用户表"
Set rs = Selectsql(SQL)
If rs.RecordCount > 0 Then
rs.MoveFirst
For X = 1 To rs.RecordCount
Combo1.AddItem rs.Fields("用户名").Value
rs.MoveNext
Next X
Combo1.ListIndex = 0
End If
rs.Close
Exit Sub
Err_box:
End Sub
Private Sub Command1_Click()
Dim SQL As String
Dim rs As ADODB.Recordset
If Text1.Text = "" Then
MsgBox "请输入口令!", 16
Text1.SetFocus
Exit Sub
End If
If Combo1.Text = "" Then
MsgBox "请选择登录用户!", 16
Combo1.SetFocus
Exit Sub
End If
SQL = "SELECT * FROM 用户表 WHERE 用户名='" & Combo1.Text & "' AND 密码='" & Text1.Text & "' "
Set rs = Selectsql(SQL)
If rs.RecordCount > 0 Then
Form1.Show '想要打开的主窗体
MsgBox "恭喜兄弟,登录成功!", 64, "提示"
Unload Me
Else
MsgBox "口令不对,请重新输入!", 16, "提示"
Text1.SetFocus
End If
End Sub
'**********************************************************************
'说明:1) 在工程中引用Microsoft ActiveX Data Objects 2.8 Library ,其它版本也行如:2.0
' 2) 在窗体中加Texe1.text(文本框控件),Combo1.text(组合框控件),Command1(命令按钮)各一个
' 3) 在SQL Server2000中创建数据库，新建表"用户表",表中包含"ID,姓名,密码"等字段,然后将以上代码复制,OK搞定
4) 以上方式无需加载ADO控件,方便!
Ⅳ VB中如何使用SQL语句与数据库表格操作
Private
Sub
Command2_Click()
If
Adodc1.Recordset.EOF
=
False
Then
c
=
MsgBox("您确认要删除该记录吗？",
vbOKCancel,
"删除提示信息")
If
c
=
vbOK
Then
Adodc1.Recordset.Delete
Adodc1.RecordSource
=
"select
*
from
人员表"
Adodc1.Refresh
End
If
Else
MsgBox
"当前数据库中没有可删除的数据记录",
vbOKOnly,
"提示信息"
End
If
End
Sub
这就是一个删除按钮的代码，希望对你有帮助
Ⅵ 怎样在vb中访问sql数据库。代码是什么
On
Error
GoTo
err
Dim
cn
As
New
ADODB.Connection
'有密码的连接：
'cn.ConnectionString
=
"Provider=SQLOLEDB.1;Persist
Security
Info=False;User
ID=登陆用户名;Password=登录密码;Initial
Catalog=数据库名;Data
Source=服务器别名"
'无密码的连接：
cn.ConnectionString
=
"Provider=SQLOLEDB.1;Integrated
Security=SSPI;Persist
Security
Info=False;Initial
Catalog=数据库名;Data
Source=服务器别名"
cn.CursorLocation=adUseClient'设置客户端游标
cn.Open
Ⅶ 如何用VB实现连接SQL数据库
一是：Public Function ConnectString() _
As String
ConnectString = "Provider=SQLOLEDB;User ID=用户;Password=密码;" & "Data Source=" + IP地址 + ";" & "Initial Catalog=数据库名" _
End Function
二是：
Public Function ExecuteSQL(ByVal SQL _
As String, MsgString As String) _
As ADODB.Recordset
Dim cnn As ADODB.Connection
Dim rst As ADODB.Recordset
Dim sTokens() As String
On Error GoTo ExecuteSQL_Error
sTokens = Split(SQL)
Set cnn = New ADODB.Connection
cnn.Open ConnectString
If InStr("INSERT,DELETE,UPDATE", _
UCase$(sTokens(0))) Then
cnn.Execute SQL
MsgString = sTokens(0) & _
" query successful"
Else
Set rst = New ADODB.Recordset
rst.Open Trim$(SQL), cnn, _
adOpenKeyset, _
adLockOptimistic
Set ExecuteSQL = rst
MsgString = "查询到" & rst.RecordCount & _
" 条记录 "
End If
ExecuteSQL_Exit:
Set rst = Nothing
Set cnn = Nothing
Exit Function
ExecuteSQL_Error:
MsgString = "查询错误: " & _
Err.Description
Resume ExecuteSQL_Exit
End Function
以上复制到模块“Mole1”中
三是:声明：
Dim ADO1 As Recordset
Option Explicit
Dim MsgText As String
Dim TXTSQL As String
四是：连接
TXTSQL = "select * from 表名"
Set ADO1 = ExecuteSQL(TXTSQL, MsgText)
ADO1.Requery
五是显示字段
Set Text1.DataSource = ADO1
Text1.DataField = "字段"
Set MSHFlexGrid1.DataSource = ADO1