我有一个网页，上面有一个网络表单.该表单预先填充了来自 SQL Server 数据库的数据.用户可以进入并编辑任何字段，然后单击底部的保存"按钮以更新数据库中的记录.出于某种原因，当我在表单中预先填充了数据时，更新语句不会更新数据库中的记录.如果我删除了在页面加载方法上预先填写表单的代码，那么更新语句就会正常工作.当我在页面加载方法中预先填充了表单数据时，更新语句似乎正在使用它已经包含的相同数据更新记录，而不是用户输入的新信息.我完全不知道如何解决这个问题，因为表单必须预先加载数据，以便用户可以分别编辑表单.
I have a webpage that has a web form on it. The form is pre-populated with data from a SQL Server database. The user can go in and edit any of the fields and click the "Save" button on the bottom to update the record in the database. For some reason, the update statement isnt updating the record in the database when I have the form pre-filled with data. If I remove the code pre-filling the form on the page load method the update statement works as it should. When I have the form pre-filled with data in the page load method, the update statement appears to be updating the record with the same data that it already had in it, not the new information the user entered. I am completely lost on how to fix this issue as the form has to have data preloaded in it so the user can edit the form respectively.
有人可以指出我需要做的错误或更正吗?我已经撞上了众所周知的砖墙:(
Can someone point out an error or some correction that I need to make? I've hit the proverbially brick wall :(
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.
Below you will find the page load method and the save button click event handler.
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();
}
}
这里是更新数据库中记录的保存按钮单击处理程序.
And here is the Save button click handler that updates the record in the database.
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();
}
}
ASP.NET 页面生命周期 如果您不保护 Page_Load 不重新执行填充文本框的代码，则会导致这种情况.
ASP.NET page lifecycle causes this situation if you don't protect the Page_Load from reexecuting the code that fill your textboxes.
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
页面.IsPostBack 是 Page 的布尔属性，它会通知您的代码是第一次调用该页面还是由于某些需要在服务器端处理的事件而调用该页面.
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，您将找到具有原始值的文本框，而不是修改后的文本框，因为 Page_Load 有重置了一切.
Page.IsPostBack is a boolean property of the Page that informs your code if the page is called for the first time or if it is called as a consequence of some event that need to be processed server-side.
In the latter case you should not execute again the code that fills your textboxes otherwise, when the flow reaches your button code, you will find the textboxes with the original values instead of the modified ones because the Page_Load has resetted everything.
不要忘记上面关于参数化您的第一个查询的评论.您已经完成了对 UPDATE 进行参数化的大部分工作，只剩下一个参数就完成了.
And do not forget the comment above about parameterizing your first query. You have already done the biggest part parameterizing the UPDATE, just one parameter remains and it is complete.
这篇关于SQL Server:更新不使用 C# 更新数据库的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！