我的网页上有一个网页表单。该表单预先填充了SQL Server数据库中的数据。用户可以进入并编辑任何字段，然后单击＆＃34;保存＆＃34;底部的按钮更新数据库中的记录。出于某种原因，当我预先填充数据时，更新语句不会更新数据库中的记录。如果我删除在页面加载方法上预填充表单的代码，则update语句将按预期工作。当我在页面加载方法中预填充数据时，更新语句似乎是使用与其中已有的相同数据更新记录，而不是用户输入的新信息。我完全迷失了如何解决这个问题，因为表单必须预先加载数据，以便用户可以分别编辑表单。
有人可以指出我需要犯的错误或纠正吗？我打了一个普通的砖墙:(
您将在下面找到页面加载方法和保存按钮单击事件处理程序。
protected void Page_Load(object sender, EventArgs e)
{
String projectID = Request.QueryString["jobID"];
String reportID = Request.QueryString["reportID"];
string selectStatement = "SELECT * FROM ahu_data WHERE unit_ID = " + reportID;
string sqlConnectionString = "Removed for Security";
using (SqlConnection connection1 = new SqlConnection(sqlConnectionString))
{
SqlCommand selectCommand = new SqlCommand(selectStatement, connection1);
connection1.Open();
using (SqlDataReader reader = selectCommand.ExecuteReader())
{
while (reader.Read())
{
UMTextBox.Text = reader["make"].ToString();
UMOTextBox.Text = reader["model"].ToString();
UTTextBox.Text = reader["type"].ToString();
USITextBox.Text = reader["size"].ToString();
USTextBox.Text = reader["serial"].ToString();
UATextBox.Text = reader["arrangement"].ToString();
UCTextBox.Text = reader["class"].ToString();
UDTextBox.Text = reader["discharge"].ToString();
UMSTextBox.Text = reader["make_sheave"].ToString();
USDTextBox.Text = reader["sheave_diameter"].ToString();
USBTextBox.Text = reader["sheave_bore"].ToString();
UBNTextBox.Text = reader["belts"].ToString();
UBSTextBox.Text = reader["belt_size"].ToString();
UFNTextBox.Text = reader["filters"].ToString();
UFSTextBox.Text = reader["filter_size"].ToString();
TCFMDTextBox.Text = reader["unitTotalCFMDesign"].ToString();
TCFMATextBox.Text = reader["unitTotalCFMActual"].ToString();
RACFMDTextBox.Text = reader["unitReturnAirCFMDesign"].ToString();
RACFMATextBox.Text = reader["unitReturnAirCFMActual"].ToString();
OACFMDTextBox.Text = reader["unitOutsideAirCFMDesign"].ToString();
OACFMATextBox.Text = reader["unitOutsideAirCFMActual"].ToString();
EACFMDTextBox.Text = reader["unitExhaustAirCFMDesign"].ToString();
EACFMATextBox.Text = reader["unitExhaustAirCFMActual"].ToString();
FRPMDTextBox.Text = reader["unitFanRPMDesign"].ToString();
FRPMATextBox.Text = reader["unitFanRPMActual"].ToString();
MRPMDTextBox.Text = reader["unitMotorRPMDesign"].ToString();
MRPMATextBox.Text = reader["unitMotorRPMActual"].ToString();
MVDTextBox.Text = reader["unitMotorVoltsDesign"].ToString();
MVATextBox.Text = reader["unitMotorVoltsActual"].ToString();
MADTextBox.Text = reader["unitMotorAmpsDesign"].ToString();
MAATextBox.Text = reader["unitMotorAmpsActual"].ToString();
MMTextBox.Text = reader["motor_make"].ToString();
MFTextBox.Text = reader["motor_frame"].ToString();
MHPTextBox.Text = reader["motor_hp"].ToString();
MRPMTextBox.Text = reader["motor_rpm"].ToString();
MVTextBox.Text = reader["motor_volts"].ToString();
MPHTextBox.Text = reader["motor_phasehz"].ToString();
MFLATextBox.Text = reader["motor_fl_amps"].ToString();
MSFTextBox.Text = reader["motor_sf"].ToString();
MMSTextBox.Text = reader["motor_make_sheave"].ToString();
MSDTextBox.Text = reader["motor_sheave_diameter"].ToString();
MSBTextBox.Text = reader["motor_sheave_bore"].ToString();
MODTextBox.Text = reader["motor_operating_diameter"].ToString();
MSCDTextBox.Text = reader["motor_sheave_center_distance"].ToString();
TSPDTextBox.Text = reader["motorTotalSPDesign"].ToString();
TSPATextBox.Text = reader["motorTotalSPActual"].ToString();
ESPDTextBox.Text = reader["motorEnteringSPDesign"].ToString();
ESPATextBox.Text = reader["motorEnteringSPActual"].ToString();
SSPDTextBox.Text = reader["motorSuctionSPDesign"].ToString();
SSPATextBox.Text = reader["motorSuctionSPActual"].ToString();
DSPDTextBox.Text = reader["motorDischargeSPDesign"].ToString();
DSPATextBox.Text = reader["motorDischargeSPActual"].ToString();
PCSPDTextBox.Text = reader["motorPreheatCoilSPDesign"].ToString();
PCSPATextBox.Text = reader["motorPreheatCoilSPActual"].ToString();
CCSPDTextBox.Text = reader["motorCoolingCoilSPDesign"].ToString();
CCSPATextBox.Text = reader["motorCoolingCoilSPActual"].ToString();
RCSPDTextBox.Text = reader["motorReheatCoilSPDesign"].ToString();
RCSPATextBox.Text = reader["motorReheatCoilSPActual"].ToString();
FSPDTextBox.Text = reader["motorFilterSPDesign"].ToString();
FSPATextBox.Text = reader["motorFilterSPActual"].ToString();
AFSPDTextBox.Text = reader["motorAfterFilterSPDesign"].ToString();
AFSPATextBox.Text = reader["motorAfterFilterSPActual"].ToString();
WSPDTextBox.Text = reader["motorWheelSPDesign"].ToString();
WSPATextBox.Text = reader["motorWheelSPActual"].ToString();
RemarksTextArea.Text = reader["remarks"].ToString();
}
}
connection1.Close();
}
}
这是保存按钮单击处理程序，用于更新数据库中的记录。
protected void SaveReportButton_Click(object sender, EventArgs e)
{
String projectID = Request.QueryString["jobID"];
String reportID = Request.QueryString["reportID"];
string unitMake = UMTextBox.Text;
string unitModel = UMOTextBox.Text;
string unitType = UTTextBox.Text;
string unitSize = USITextBox.Text;
string unitSerial = USTextBox.Text;
string unitArrangement = UATextBox.Text;
string unitClass = UCTextBox.Text;
string unitDischarge = UDTextBox.Text;
string unitMS = UMSTextBox.Text;
string unitSD = USDTextBox.Text;
string unitSB = USBTextBox.Text;
string unitBeltNumber = UBNTextBox.Text;
string unitBeltSize = UBSTextBox.Text;
string unitFilterNumber = UFNTextBox.Text;
string unitFilterSize = UFSTextBox.Text;
string unitTotalCFMDesign = TCFMDTextBox.Text;
string unitTotalCFMActual = TCFMATextBox.Text;
string unitReturnAirCFMDesign = RACFMDTextBox.Text;
string unitReturnAirCFMActual = RACFMATextBox.Text;
string unitOutsideAirCFMDesign = OACFMDTextBox.Text;
string unitOutsideAirCFMActual = OACFMATextBox.Text;
string unitExhaustAirCFMDesign = EACFMDTextBox.Text;
string unitExhaustAirCFMActual = EACFMATextBox.Text;
string unitFanRPMDesign = FRPMDTextBox.Text;
string unitFanRPMActual = FRPMATextBox.Text;
string unitMotorRPMDesign = MRPMDTextBox.Text;
string unitMotorRPMActual = MRPMATextBox.Text;
string unitMotorVoltsDesign = MVDTextBox.Text;
string unitMotorVoltsActual = MVATextBox.Text;
string unitMotorAmpsDesign = MADTextBox.Text;
string unitMotorAmpsActual = MAATextBox.Text;
string motorMake = MMTextBox.Text;
string motorFrame = MFTextBox.Text;
string motorHP = MHPTextBox.Text;
string motorRPM = MRPMTextBox.Text;
string motorVolts = MVTextBox.Text;
string motorPhaseHz = MPHTextBox.Text;
string motorFullLoadAmps = MFLATextBox.Text;
string motorSF = MSFTextBox.Text;
string motorMakeSheave = MMSTextBox.Text;
string motorSheaveDiameter = MSDTextBox.Text;
string motorSheaveBore = MSBTextBox.Text;
string motorOperatingDiameter = MODTextBox.Text;
string motorSheaveCDistance = MSCDTextBox.Text;
string motorTotalSPDesign = TSPDTextBox.Text;
string motorTotalSPActual = TSPATextBox.Text;
string motorEnteringSPDesign = ESPDTextBox.Text;
string motorEnteringSPActual = ESPATextBox.Text;
string motorSuctionSPDesign = SSPDTextBox.Text;
string motorSuctionSPActual = SSPATextBox.Text;
string motorDischargeSPDesign = DSPDTextBox.Text;
string motorDischargeSPActual = DSPATextBox.Text;
string motorPreheatCoilSPDesign = PCSPDTextBox.Text;
string motorPreheatCoilSPActual = PCSPATextBox.Text;
string motorCoolingCoilSPDesign = CCSPDTextBox.Text;
string motorCoolingCoilSPActual = CCSPATextBox.Text;
string motorReheatCoilSPDesign = RCSPDTextBox.Text;
string motorReheatCoilSPActual = RCSPATextBox.Text;
string motorFilterSPDesign = FSPDTextBox.Text;
string motorFilterSPActual = FSPATextBox.Text;
string motorAfterFilterSPDesign = AFSPDTextBox.Text;
string motorAfterFilterSPActual = AFSPATextBox.Text;
string motorWheelSPDesign = WSPDTextBox.Text;
string motorWheelSPActual = WSPATextBox.Text;
string remarks = RemarksTextArea.Text;
string updateStatement = @"UPDATE ahu_data SET make=@UNITMAKE, model=@UNITMODEL, type=@UNITTYPE, size=@UNITSIZE, serial=@UNITSERIAL, arrangement=@UNITARRANGEMENT,
class=@UNITCLASS, discharge=@UNITDISCHARGE, make_sheave=@UNITMS, sheave_diameter=@UNITSD, sheave_bore=@UNITSB,
belts=@UNITBELTNUMBER, belt_size=@UNITBELTSIZE, filters=@UNITFILTERNUMBER, filter_size=@UNITBELTSIZE,
unitTotalCFMDesign=@UNITTOTALCFMDESIGN, unitTotalCFMActual=@UNITTOTALCFMACTUAL, unitReturnAirCFMDesign=@UNITRETURNAIRCFMDESIGN,
unitReturnAirCFMActual=@UNITRETURNAIRCFMACTUAL, unitOutsideAirCFMDesign=@UNITOUTSIDEAIRCFMDESIGN,
unitOutsideAirCFMActual=@UNITOUTSIDEAIRCFMACTUAL, unitExhaustAirCFMDesign=@UNITEXHAUSTAIRCFMDESIGN,
unitExhaustAirCFMActual=@UNITEXHAUSTAIRCFMACTUAL, unitFanRPMDesign=@UNITFANRPMDESIGN,
unitFanRPMActual=@UNITFANRPMACTUAL, unitMotorRPMDesign=@UNITMOTORRPMDESIGN, unitMotorRPMActual=@UNITMOTORRPMACTUAL,
unitMotorVoltsDesign=@UNITMOTORVOLTSDESIGN, unitMotorVoltsActual=@UNITMOTORVOLTSACTUAL, unitMotorAmpsDesign=@UNITMOTORAMPSDESIGN,
unitMotorAmpsActual=@UNITMOTORAMPSACTUAL, motor_make=@MOTORMAKE, motor_frame=@MOTORFRAME, motor_hp=@MOTORHP,
motor_rpm=@MOTORRPM, motor_volts=@MOTORVOLTS, motor_phasehz=@MOTORPHASEHZ, motor_fl_amps=@MOTORFULLLOADAMPS,
motor_sf=@MOTORSF, motor_make_sheave=@MOTORMAKESHEAVE, motor_sheave_diameter=@MOTORSHEAVEDIAMETER,
motor_sheave_bore=@MOTORSHEAVEBORE, motor_operating_diameter=@MOTOROPERATINGDIAMETER, motor_sheave_center_distance=@MOTORSHEAVECDISTANCE,
motorTotalSPDesign=@MOTORTOTALSPDESIGN, motorTotalSPActual=@MOTORTOTALSPACTUAL, motorEnteringSPDesign=@MOTORENTERINGSPDESIGN,
motorEnteringSPActual=@MOTORENTERINGSPACTUAL, motorSuctionSPDesign=@MOTORSUCTIONSPDESIGN, motorSuctionSPActual=@MOTORSUCTIONSPACTUAL,
motorDischargeSPDesign=@MOTORDISCHARGESPDESIGN, motorDischargeSPActual=@MOTORDISCHARGESPACTUAL, motorPreheatCoilSPDesign=@MOTORPREHEATCOILSPDESIGN,
motorPreheatCoilSPActual=@MOTORPREHEATCOILSPACTUAL, motorCoolingCoilSPDesign=@MOTORCOOLINGCOILSPDESIGN, motorCoolingCoilSPActual=@MOTORCOOLINGCOILSPACTUAL,
motorReheatCoilSPDesign=@MOTORREHEATCOILSPDESIGN, motorReheatCoilSPActual=@MOTORREHEATCOILSPACTUAL, motorFilterSPDesign=@MOTORFILTERSPDESIGN,
motorFilterSPActual=@MOTORFILTERSPACTUAL, motorAfterFilterSPDesign=@MOTORAFTERFILTERSPDESIGN, motorAfterFilterSPActual=@MOTORAFTERFILTERSPACTUAL,
motorWheelSPDesign=@MOTORWHEELSPDESIGN, motorWheelSPActual=@MOTORWHEELSPACTUAL, remarks=@REMARKS WHERE unit_ID = " + reportID;
string sqlConnectionString = "Removed for Security";
using (SqlConnection connection1 = new SqlConnection(sqlConnectionString))
{
connection1.Open();
using (SqlCommand updateCommand = new SqlCommand(updateStatement, connection1))
{
updateCommand.Parameters.AddWithValue("@UNITMAKE", unitMake);
updateCommand.Parameters.AddWithValue("@UNITMODEL", unitModel);
updateCommand.Parameters.AddWithValue("@UNITTYPE", unitType);
updateCommand.Parameters.AddWithValue("@UNITSIZE", unitSize);
updateCommand.Parameters.AddWithValue("@UNITSERIAL", unitSerial);
updateCommand.Parameters.AddWithValue("@UNITARRANGEMENT", unitArrangement);
updateCommand.Parameters.AddWithValue("@UNITCLASS", unitClass);
updateCommand.Parameters.AddWithValue("@UNITDISCHARGE", unitDischarge);
updateCommand.Parameters.AddWithValue("@UNITMS", unitMS);
updateCommand.Parameters.AddWithValue("@UNITSD", unitSD);
updateCommand.Parameters.AddWithValue("@UNITSB", unitSB);
updateCommand.Parameters.AddWithValue("@UNITBELTNUMBER", unitBeltNumber);
updateCommand.Parameters.AddWithValue("@UNITBELTSIZE", unitBeltSize);
updateCommand.Parameters.AddWithValue("@UNITFILTERNUMBER", unitFilterNumber);
updateCommand.Parameters.AddWithValue("@UNITFILTERSIZE", unitFilterSize);
updateCommand.Parameters.AddWithValue("@UNITTOTALCFMDESIGN", unitTotalCFMDesign);
updateCommand.Parameters.AddWithValue("@UNITTOTALCFMACTUAL", unitTotalCFMActual);
updateCommand.Parameters.AddWithValue("@UNITRETURNAIRCFMDESIGN", unitReturnAirCFMDesign);
updateCommand.Parameters.AddWithValue("@UNITRETURNAIRCFMACTUAL", unitReturnAirCFMActual);
updateCommand.Parameters.AddWithValue("@UNITOUTSIDEAIRCFMDESIGN", unitOutsideAirCFMDesign);
updateCommand.Parameters.AddWithValue("@UNITOUTSIDEAIRCFMACTUAL", unitOutsideAirCFMActual);
updateCommand.Parameters.AddWithValue("@UNITEXHAUSTAIRCFMDESIGN", unitExhaustAirCFMDesign);
updateCommand.Parameters.AddWithValue("@UNITEXHAUSTAIRCFMACTUAL", unitExhaustAirCFMActual);
updateCommand.Parameters.AddWithValue("@UNITFANRPMDESIGN", unitFanRPMDesign);
updateCommand.Parameters.AddWithValue("@UNITFANRPMACTUAL", unitFanRPMActual);
updateCommand.Parameters.AddWithValue("@UNITMOTORRPMDESIGN", unitMotorRPMDesign);
updateCommand.Parameters.AddWithValue("@UNITMOTORRPMACTUAL", unitMotorRPMActual);
updateCommand.Parameters.AddWithValue("@UNITMOTORVOLTSDESIGN", unitMotorVoltsDesign);
updateCommand.Parameters.AddWithValue("@UNITMOTORVOLTSACTUAL", unitMotorVoltsActual);
updateCommand.Parameters.AddWithValue("@UNITMOTORAMPSDESIGN", unitMotorAmpsDesign);
updateCommand.Parameters.AddWithValue("@UNITMOTORAMPSACTUAL", unitMotorAmpsActual);
updateCommand.Parameters.AddWithValue("@MOTORMAKE", motorMake);
updateCommand.Parameters.AddWithValue("@MOTORFRAME", motorFrame);
updateCommand.Parameters.AddWithValue("@MOTORHP", motorHP);
updateCommand.Parameters.AddWithValue("@MOTORRPM", motorRPM);
updateCommand.Parameters.AddWithValue("@MOTORVOLTS", motorVolts);
updateCommand.Parameters.AddWithValue("@MOTORPHASEHZ", motorPhaseHz);
updateCommand.Parameters.AddWithValue("@MOTORFULLLOADAMPS", motorFullLoadAmps);
updateCommand.Parameters.AddWithValue("@MOTORSF", motorSF);
updateCommand.Parameters.AddWithValue("@MOTORMAKESHEAVE", motorMakeSheave);
updateCommand.Parameters.AddWithValue("@MOTORSHEAVEDIAMETER", motorSheaveDiameter);
updateCommand.Parameters.AddWithValue("@MOTORSHEAVEBORE", motorSheaveBore);
updateCommand.Parameters.AddWithValue("@MOTOROPERATINGDIAMETER", motorOperatingDiameter);
updateCommand.Parameters.AddWithValue("@MOTORSHEAVECDISTANCE", motorSheaveCDistance);
updateCommand.Parameters.AddWithValue("@MOTORTOTALSPDESIGN", motorTotalSPDesign);
updateCommand.Parameters.AddWithValue("@MOTORTOTALSPACTUAL", motorTotalSPActual);
updateCommand.Parameters.AddWithValue("@MOTORENTERINGSPDESIGN", motorEnteringSPDesign);
updateCommand.Parameters.AddWithValue("@MOTORENTERINGSPACTUAL", motorEnteringSPActual);
updateCommand.Parameters.AddWithValue("@MOTORSUCTIONSPDESIGN", motorSuctionSPDesign);
updateCommand.Parameters.AddWithValue("@MOTORSUCTIONSPACTUAL", motorSuctionSPActual);
updateCommand.Parameters.AddWithValue("@MOTORDISCHARGESPDESIGN", motorDischargeSPDesign);
updateCommand.Parameters.AddWithValue("@MOTORDISCHARGESPACTUAL", motorDischargeSPActual);
updateCommand.Parameters.AddWithValue("@MOTORPREHEATCOILSPDESIGN", motorPreheatCoilSPDesign);
updateCommand.Parameters.AddWithValue("@MOTORPREHEATCOILSPACTUAL", motorPreheatCoilSPActual);
updateCommand.Parameters.AddWithValue("@MOTORCOOLINGCOILSPDESIGN", motorCoolingCoilSPDesign);
updateCommand.Parameters.AddWithValue("@MOTORCOOLINGCOILSPACTUAL", motorCoolingCoilSPActual);
updateCommand.Parameters.AddWithValue("@MOTORREHEATCOILSPDESIGN", motorReheatCoilSPDesign);
updateCommand.Parameters.AddWithValue("@MOTORREHEATCOILSPACTUAL", motorReheatCoilSPActual);
updateCommand.Parameters.AddWithValue("@MOTORFILTERSPDESIGN", motorFilterSPDesign);
updateCommand.Parameters.AddWithValue("@MOTORFILTERSPACTUAL", motorFilterSPActual);
updateCommand.Parameters.AddWithValue("@MOTORAFTERFILTERSPDESIGN", motorAfterFilterSPDesign);
updateCommand.Parameters.AddWithValue("@MOTORAFTERFILTERSPACTUAL", motorAfterFilterSPActual);
updateCommand.Parameters.AddWithValue("@MOTORWHEELSPDESIGN", motorWheelSPDesign);
updateCommand.Parameters.AddWithValue("@MOTORWHEELSPACTUAL", motorWheelSPActual);
updateCommand.Parameters.AddWithValue("@REMARKS", remarks);
updateCommand.ExecuteNonQuery();
}
connection1.Close();
}
}
答案 0 :(得分：3)
Page_Load重新执行填充文本框的代码，ASP.NET page lifecycle会导致出现这种情况。
if (!IsPostBack)
{
string selectStatement = "SELECT * FROM ahu_data WHERE unit_ID = " + reportID;
string sqlConnectionString = "Removed for Security";
using (SqlConnection connection1 = new SqlConnection(sqlConnectionString))
{
.... rest of code that pre-fill your fields
Page.IsPostBack是Page的布尔属性，如果第一次调用页面，或者由于某些需要在服务器端处理的事件而调用它，则会通知您的代码。 />
在后一种情况下，您不应再次执行填充文本框的代码，否则，当流程到达您的按钮代码时，您会发现文本框包含原始值而不是修改后的文本框，因为Page_Load已重置所有内容。
不要忘记上面关于参数化第一个查询的评论。您已经完成了参数化UPDATE的最大部分，只剩下一个参数并且它已完成。
答案 1 :(得分：1)
更新工作正常，问题是它使用了表格中已有的相同数据，所以它不会改变任何内容。
单击“保存”按钮时，页面会进行回发以在服务器上运行代码。首先，Page_Load事件运行并加载将替换您在表单中输入的数据的原始数据。然后运行SaveReportButton_Click事件来更新记录。
为了防止Page_Load事件处理程序替换表单中的数据，您应该使用isPostBack property来检查页面是否由于回发而加载：
if (!IsPostBack) {
// load the data from the database in here
}