以下代码 myDa.Fill(myDs); 提示这行出错protected void dz_TextChanged(object sender, EventArgs e)
{
string Path = Server.MapPath("../ymyd/lj.mdb");
OleDbConnection myConn = new OleDbConnection("provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Path + ";");
myConn.Open();
string sqlStr = "select * from ls where dz='" + this.dz.Text.Trim() + "'";
OleDbCommand myCmd = new OleDbCommand(sqlStr, myConn);
OleDbDataAdapter myDa = new OleDbDataAdapter(myCmd);
DataSet myDs = new DataSet();
myDa.Fill(myDs); 提示这行出错
if (myDs.Tables[0].Rows.Count > 0)
{
Response.Write("alert('您登记的网址已存在!')");
}
myDa.Dispose();
myDs.Dispose();
myConn.Close();
}
{
string Path = Server.MapPath("../ymyd/lj.mdb");
OleDbConnection myConn = new OleDbConnection("provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Path + ";");
myConn.Open();
string sqlStr = "select * from ls where dz='" + this.dz.Text.Trim() + "'";
OleDbCommand myCmd = new OleDbCommand(sqlStr, myConn);
OleDbDataAdapter myDa = new OleDbDataAdapter(myCmd);
DataSet myDs = new DataSet();
myDa.Fill(myDs); 提示这行出错
if (myDs.Tables[0].Rows.Count > 0)
{
Response.Write("alert('您登记的网址已存在!')");
}
myDa.Dispose();
myDs.Dispose();
myConn.Close();
}
很就没有用adapter了,不知道需不需要判断null
“/”应用程序中的服务器错误。
--------------------------------------------------------------------------------至少一个参数没有被指定值。
说明: 执行当前 Web 请求期间,出现未处理的异常。请检查堆栈跟踪信息,以了解有关该错误以及代码中导致错误的出处的详细信息。 异常详细信息: System.Data.OleDb.OleDbException: 至少一个参数没有被指定值。源错误:
行 37: OleDbDataAdapter myDa = new OleDbDataAdapter(myCmd);
行 38: DataSet myDs = new DataSet();
行 39: myDa.Fill(myDs);
行 40: if (myDs.Tables[0].Rows.Count > 0)
行 41: {
源文件: e:\website\lj\add.aspx 行: 39 堆栈跟踪:
[OleDbException (0x80040e10): 至少一个参数没有被指定值。]
System.Data.OleDb.OleDbCommand.ExecuteCommandTextForSingleResult(tagDBPARAMS dbParams, Object& executeResult) +267
System.Data.OleDb.OleDbCommand.ExecuteCommandText(Object& executeResult) +192
System.Data.OleDb.OleDbCommand.ExecuteCommand(CommandBehavior behavior, Object& executeResult) +48
System.Data.OleDb.OleDbCommand.ExecuteReaderInternal(CommandBehavior behavior, String method) +106
System.Data.OleDb.OleDbCommand.ExecuteReader(CommandBehavior behavior) +111
System.Data.OleDb.OleDbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior) +4
System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +141
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +137
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet) +86
ASP.lj_add_aspx.dz_TextChanged(Object sender, EventArgs e) in e:\website\lj\add.aspx:39
System.Web.UI.WebControls.TextBox.OnTextChanged(EventArgs e) +105
System.Web.UI.WebControls.TextBox.RaisePostDataChangedEvent() +134
System.Web.UI.WebControls.TextBox.System.Web.UI.IPostBackDataHandler.RaisePostDataChangedEvent() +7
System.Web.UI.Page.RaiseChangedEvents() +137
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4778
--------------------------------------------------------------------------------
版本信息: Microsoft .NET Framework 版本:2.0.50727.42; ASP.NET 版本:2.0.50727.42
--------------------------------------------------------------------------------编译错误
说明: 在编译向该请求提供服务所需资源的过程中出现错误。请检查下列特定错误详细信息并适当地修改源代码。 编译器错误信息: CS1010: 常量中有换行符源错误: 行 40: if (myDs.Tables[0].Rows.Count > 0)
行 41: {
行 42: Response.Write("<script>alert('您登记的网址已存在。')</script>");
行 43: Response.End();
行 44: }
源文件: e:\website\lj\add.aspx 行: 42
"<script>alert('您登记的网址已存在。')</"+"script>"