问题:[microsoft][odbc microsoft access driver]标准表达式中数据类型不匹配
原因:Sql语句书写格式不标准
解决办法:
如: string sqlstr="select * from student where studentId>='" + Convert.ToInt32(this.textBox1.Text)+"'";
应改为:string sqlstr="select * from student where studentId>=" + Convert.ToInt32(this.textBox1.Text);
private void button1_Click(object sender, System.EventArgs e)
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{
DataSet myDS;
myDS=new DataSet();
myDS=cgtdb.GetDataFromAccess(accessDbname,"admin","123","select * from student where studentId>=" + Convert.ToInt32(this.textBox1.Text),"student" );
if(myDS!=null)
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{
this.dataGrid1.DataSource =myDS.Tables[0];
MessageBox.Show(myDS.Tables[0].Rows[0][0].GetType().ToString() ) ;
}
}
Public Function DataTransition_ADODBCon() As ADODB.Connection
Dim conn As New ADODB.Connection()
Try
ReadIniFile()
conn.ConnectionString = "Provider=SQLOLEDB;Data Source='" & Trim(SqlServerName_Str_Pub) & " ';Initial Catalog='" & Trim(SqlInitDB_Str_Pub) & "';Integrated Security=SSPI;" & " ," & " '" & Trim(SqlUserName_Str_Pub) & "' " & " , " & " '" & Trim(SqlUserPassWord_Str_Pub) & "'" & ", " & " -1"
Catch
MsgBox(" MyOleConStr 错误号: " & Err.Number.ToString & " 错误描述 : " & Err.Description.ToString)
End Try
DataTransition_ADODBCon = conn
End Function
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Public Function SqlConStr() As String
Dim sqlconstring As String = ""
Try
ReadIniFile()
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sqlconstring = "data source=" & Trim(SqlServerName_Str_Pub) & "; initial catalog=" & Trim(SqlInitDB_Str_Pub) & "; persist security info=true; user id=" & Trim(SqlUserName_Str_Pub) & "; Password=" & Trim(SqlUserPassWord_Str_Pub) & "; workstation id=" & Trim(SqlServerName_Str_Pub) & "; packet size=4096"
Catch
MsgBox("错误号: " & Err.Number.ToString & " 错误描述 : " & Err.Description.ToString)
End Try
Return sqlconstring
End Function
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Public Function SqlConStr2() As String
Dim sqlconstring As String = ""
Try
ReadIniFile()
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sqlconstring = Trim(SqlServerName_Str_Pub) & "\" & Trim(SqlInitDB_Str_Pub) & "\" & Trim(SqlUserName_Str_Pub) & "\" & Trim(SqlUserPassWord_Str_Pub)
Catch
MsgBox("SqlConStr 错误号: " & Err.Number.ToString & " 错误描述 : " & Err.Description.ToString)
End Try
Return sqlconstring
End Function
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'*************************************************************************************************************************************************'
'1.2.连接ACCESS数据库
'*************************************************************************************************************************************************'
Public Function Access_OleDBCon(ByVal DBPath As String) As OleDbConnection
Dim OleCon As OleDbConnection = New OleDbConnection()
'Dim DBPath As String = "d:\mrfu\DriverManager.mdb"
OleCon.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source='" & DBPath & "'"
Return OleCon
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End Function
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'*************************************************************************************************************************************************'
'对ACCESS数据库进行操作
'*************************************************************************************************************************************************'
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Public Function Access_ADODBConNeedPassword(ByVal DBPathAndDatabaseName As String, ByVal UserID As String, ByVal Password As String, ByVal SqlStr As String) As String
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Dim FlagStr As String = "0"
Dim ConnectionString As String = ""
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ConnectionString = "DRIVER={Microsoft Access Driver (*.mdb)};" & _
"DBQ=" & DBPathAndDatabaseName & ";DefaultDir=;" & _
"UID=" & UserID & ";" & _
"PWD=" & Password & ";"
Dim Adocon As ADODB.Connection
Try
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Adocon = New ADODB.Connection
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Adocon.ConnectionString = ConnectionString
Adocon.ConnectionTimeout = 120
Adocon.CommandTimeout = 160
Adocon.Open()
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Adocon.Execute(SqlStr)
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Adocon.Close()
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Adocon = Nothing
FlagStr = "1"
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Catch
If Adocon.State = ConnectionState.Open Then
Adocon.Close()
End If
FlagStr = "0"
MsgBox(Err.Description.ToString, MsgBoxStyle.Exclamation, "错误提示")
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End Try
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Return FlagStr
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End Function
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'*************************************************************************************************************************************************'
'访问ACCESS数据库,并返回小批量数据
'*************************************************************************************************************************************************'
Public Function Access_GetDataReturnArrayList(ByVal DBPathAndDatabaseName As String, ByVal UserID As String, ByVal Password As String, ByVal SqlStr As String, ByVal TableName As String, ByVal FiledsName As String) As ArrayList
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Dim TempArrayList As ArrayList
TempArrayList = Nothing
Dim rs As ADODB.Recordset
Dim ConnectionString As String = ""
ConnectionString = "DRIVER={Microsoft Access Driver (*.mdb)};" & _
"DBQ=" & DBPathAndDatabaseName & ";DefaultDir=;" & _
"UID=" & UserID & ";" & _
"PWD=" & Password & ";"
Dim Adocon As ADODB.Connection
Try
Adocon = New ADODB.Connection
Adocon.ConnectionString = ConnectionString
Adocon.ConnectionTimeout = 120
Adocon.CommandTimeout = 160
Adocon.Open()
rs = New ADODB.Recordset
rs.Open(SqlStr, Adocon, ADODB.CursorTypeEnum.adOpenKeyset, ADODB.LockTypeEnum.adLockOptimistic, CInt(ADODB.CommandTypeEnum.adCmdText))
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TempArrayList = New ArrayList
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'如果记录集为空,输出一个错误信息
If (rs.BOF Or rs.EOF) Then
Adocon.Close()
Adocon = Nothing
rs = Nothing
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MsgBox("没有找到任何记录,请检查你的" & TableName & " 表 ", MsgBoxStyle.Information, "系统消息")
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Return TempArrayList
End If
'循环存入数据
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While (Not rs.EOF)
TempArrayList.Add(rs.Fields(FiledsName).Value.ToString())
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rs.MoveNext()
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End While
Adocon.Close()
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Adocon = Nothing
rs = Nothing
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Catch
If Adocon.State = ConnectionState.Open Then
Adocon.Close()
End If
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MsgBox(Err.Description.ToString, MsgBoxStyle.Exclamation, "错误提示")
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End Try
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Return TempArrayList
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End Function
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'*************************************************************************************************************************************************'
'访问ACCESS数据库,并返回数据集
'*************************************************************************************************************************************************'
Public Function GetDataFromAccess(ByVal DBPathAndDatabaseName As String, ByVal UserID As String, ByVal Password As String, ByVal SqlStr As String, ByVal TableName As String) As DataSet
Dim custDA As OleDbDataAdapter = New OleDbDataAdapter
Dim custDS As DataSet = New DataSet
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Dim rs As ADODB.Recordset
Dim ConnectionString As String = ""
ConnectionString = "DRIVER={Microsoft Access Driver (*.mdb)};" & _
"DBQ=" & DBPathAndDatabaseName & ";DefaultDir=;" & _
"UID=" & UserID & ";" & _
"PWD=" & Password & ";"
Dim Adocon As ADODB.Connection
Try
Adocon = New ADODB.Connection
Adocon.ConnectionString = ConnectionString
Adocon.ConnectionTimeout = 120
Adocon.CommandTimeout = 160
Adocon.Open()
rs = New ADODB.Recordset
rs.Open(SqlStr, Adocon, ADODB.CursorTypeEnum.adOpenKeyset, ADODB.LockTypeEnum.adLockOptimistic, CInt(ADODB.CommandTypeEnum.adCmdText))
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'如果记录集为空,输出一个错误信息
If (rs.BOF Or rs.EOF) Then
Adocon.Close()
Adocon = Nothing
rs = Nothing
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MsgBox("没有找到任何记录,请检查你的" & TableName & " 表 ", MsgBoxStyle.Information, "系统消息")
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Return custDS
End If
'存入dataset数据
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custDA.Fill(custDS, rs, "Customers")
Adocon.Close()
Adocon = Nothing
rs = Nothing
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Catch
If Adocon.State = ConnectionState.Open Then
Adocon.Close()
End If
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MsgBox(Err.Description.ToString, MsgBoxStyle.Exclamation, "错误提示")
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End Try
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Return custDS
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End Function