vb.net增删改查,vbnet access 增删改查
vb.net可以对access数据实现增删查改吗
1、VB.NET是一个高级程序设计语言
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2、ACCESS是一个办公型的数据库
3、只要设置正确、代码完整是完全可以操作的
vb.net同时对两个ACCESS数据库进行增删改查。
见下面的代码，自己换成真实的数据库及表即可
Imports System.Data
Imports System.IO
Imports System.Data.OleDb
Module Module1
Public cn1 As New OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\ACCESS数据库1.mdb") '定义连接1---这里请更改为实际数据库路径及名称
Public cn2 As New OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\ACCESS数据库2.mdb") '定义连接2---这里请更改为实际数据库路径及名称
Public DataBaseRST1 As Integer '用来返回数据库执行结果
Public DataBaseRST2 As Integer '用来返回数据库执行结果
Public Function DataModify(ByVal str_cmd1 As String, ByVal str_cmd2 As String) As Boolean '进行数据库修改操作函数
Dim cmdinsert1 As New OleDbCommand
Dim cmdinsert2 As New OleDbCommand
Try
cmdinsert1.CommandText = str_cmd1
cmdinsert2.CommandText = str_cmd2
cmdinsert1.Connection = cn1
cmdinsert2.Connection = cn2
If cn1.State = ConnectionState.Closed Then cn1.Open()
If cn2.State = ConnectionState.Closed Then cn2.Open()
DataBaseRST1 = cmdinsert1.ExecuteNonQuery() '用来返回执行的结果
DataBaseRST2 = cmdinsert2.ExecuteNonQuery() '用来返回执行的结果
cn1.Close()
cn2.Close()
Return True
Catch ex As Exception
MessageBox.Show(Err.Description, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
Return False
End Try
End Function
End Module
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
DataModify("insert into aa values ('1','2')", "insert into aa values ('1','2')") '调用方法
End Sub
End Class
求一个vb.net链接mysql数据库的增删改查程序，求速度。。。
首先你本地要安装MySQL Connector Net
工程引用mysql.data
连接数据库：
Imports MySql.Data
Imports MySql.Data.MySqlClient
‘连接字符串dbServerName 是ip,下面的英文应该懂得吧。
dim sA as string
sA = "server=" Me.dbServerName "; port=3306; database=" Me.dbDataBaseName _
"; user id=" Me.dbUserName "; password=" Me.dbPassWord "; "
dim mvardbConnectionMysql As MySqlConnection
With mvardbConnectionMysql
.ConnectionString = sA
.Open()
End With
4. 读取数据
dim xx As MySqlDataReader
Dim oC As MySqlCommand = New MySqlCommand(sSql, Me.mvardbConnectionMysql)
oC.CommandType = CommandType.Text
xx= oC.ExecuteReader()
if xx.HasRows
do while xx.read() ’一次读取一行
msgbox xx.item(2) '取出当前行的第三个字段的值显示。
loop
end if
5. 写入数据
Dim oT As MySqlTransaction = Me.mvardbConnectionMysql.BeginTransaction()
Try
Dim oC As MySqlCommand
'下面的commandtext是执行的更新语句，例如Insert into 语句。
oC = New MySqlCommand(CommandText, Me.mvardbConnectionMysql, oT)
oC.CommandType = CommandType.Text
oC.ExecuteNonQuery()
oT.Commit()
oC = Nothing
oT = Nothing
Catch oe As Exception
oT.Rollback()
End Try
你好！有没有vb.net对SQL数据库进行增删改查的例子
一般都是vb.net传入参数 交给存储过程去做的 你是要在vb.net前台就执行的例子 还是想要调用存储过程的例子
前台的一般就是这样
Dim paras As New NameValueCollection
paras .Append("delete from T_AlarmConfig ")
paras .Append(" where AlarmConfigID=@AlarmConfigID")
调用存储过程的就是给写存储过程了，这是调用存储过程的例子，只能理解理解
''' summary
''' 删除数据
''' /summary
''' param name="procName"存储过程名/param
''' param name="paras"存储过程参数/param
''' remarks
''' 2006-5-29 zhuzh Created
''' /remarks
Public Sub DeleteData(ByVal procName As String, _
ByVal paras As NameValueCollection, _
Optional ByVal timeout As Integer = 30)
eventCount += 1
'存储过程参数名数组
Dim paraNames As String() = {}
'存储过程参数值数组
Dim paraValues As String() = {}
'传入的参数转化成数组
Me.ConvertNameValueCollection(paras, paraNames, paraValues, STATUS_UPDATE)
'判断系统类型调用相应模块的方法
If isWebSys Then
DeleteDelegateInstance = AddressOf webGw.ExecProc
Else
DeleteDelegateInstance = AddressOf AdoGw.ExecProc
End If
Dim ret As Integer = 0
Dim ds As New DataSet
'----guojun 2008-1-2 add-----
If timeout 60000 Then
timeout = 60000
End If
'--------防止超时异常--------
DeleteDelegateInstance.BeginInvoke(procName, ret, ds, paraNames, paraValues, timeout, _
AddressOf DataDeletedCallBack, Nothing)
End Sub
求一个VB.net 增删改查实例 ，哪位大神有空帮我写一下或者有现成的给我一个，，我比较菜又比较急，在线等
Imports System.Data.OleDb
'Imports System.Data.OracleClient
Imports System.Data.SqlClient
'链接Oracle
'cn = New SqlConnection(""Data Source=TNS名称;Persist Security Info=True;User ID=用户名;Password=密码;" ")
'Imports System.Data.OracleClient
'Dim oOracleConn As OracleConnection = New OracleConnection()
'oOracleConn.ConnectionString = ""Data Source=MyOracleDB; User Id=username; Password=passwd; Integrated Security=no; "
'oOracleConn.Open()
'链接SQL Server
'cn = New SqlConnection("Data Source=.;Initial Catalog=Sales;Integrated Security=False;User ID=sa;Password=;")
'链接Access
'cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" db_path ";Persist Security Info=False")
Public Class Fun_DataBase
Dim cn As OleDbConnection
Dim cm As OleDbCommand
Dim da As OleDbDataAdapter
Dim ds As DataSet
Dim db_path As String = "D:\Documents\Visual Studio 2013\Projects\VBnet1\VBnet1\Resources\Database1.mdb"
Function Fun_sql1(Str_sql As String, V_调用来源 As String) '按指定sql，反馈1个查询值
Try
'Dim cn As New OleDbConnection("Data Source=.;Initial Catalog=Sales;Integrated Security=False;User ID=sa;Password=123456;")
'链接Access
cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" db_path ";Persist Security Info=False")
cn.Open() 'sql语句执行前，必须打开连接
cm = New OleDbCommand(Str_sql, cn)
cm.ExecuteNonQuery()
Dim strValue As String = cm.ExecuteScalar.ToString
'MessageBox.Show(strValue)
Fun_sql1 = strValue
cn.Close()
Fun_sql1 = True
Catch ex As Exception
MessageBox.Show(V_调用来源 ":执行sql语句失败！" Str_sql)
Fun_sql1 = False
End Try
End Function
Function Fun_sqln(Str_sql As String, V_调用来源 As String) '按指定sql，反馈1行n列查询值
Try
'链接Access
cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" db_path ";Persist Security Info=False")
cn.Open() 'sql语句执行前，必须打开连接
Dim cmd As New OleDbCommand("select * from grade", cn)
'Dim dr As SqlDataReader
Dim dr As OleDbDataReader
dr = cmd.ExecuteReader()
Dim strDisplay As String = ""
While dr.Read()
Fun_sqln = dr(0).ToString "|"
End While
cn.Close()
Fun_sqln = True
Catch ex As Exception
MessageBox.Show(V_调用来源 ":执行sql语句失败！" Str_sql)
Fun_sqln = False
End Try
'Dim s = Split(F.Fun_sqln("ef"), "|")
'Dim i As Integer
'i = UBound(s)
'For i = 0 To UBound(s)
' MessageBox.Show(s(i))
'Next
End Function
Public Function Fun_sql_exec(Str_sql As String, V_调用来源 As String) '执行指定sql，反馈T|F
Try
'链接Access
cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" db_path ";Persist Security Info=False")
cn.Open() 'sql语句执行前，必须打开连接
cm = New OleDbCommand(Str_sql, cn)
cm.ExecuteNonQuery()
cn.Close()
Fun_sql_exec = True
Catch ex As Exception
MessageBox.Show(V_调用来源 ":执行sql语句失败！" Str_sql)
Fun_sql_exec = False
End Try
End Function
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