第二次出现Access数据库访问错误?c#
嘿,伙计们,我正在使用C#,我已经成功地访问了我的数据库并分配了变量等,但我想再次访问它,由于某种原因,它在这一点上失败了:第二次出现Access数据库访问错误?c#,c#,database,list,ms-access,C#,Database,List,Ms Access,嘿,伙计们,我正在使用C#,我已经成功地访问了我的数据库并分配了变量等,但我想再次访问它,由于某种原因,它在这一点上失败了: OleDbDataReader reader = command.ExecuteReader(); 下面是一些代码片段,可以帮助你们更好地理解。如果有人能指出我可能做错了什么,我将不胜感激 //######################### // DATABASE OPERATIONS //
OleDbDataReader reader = command.ExecuteReader();
下面是一些代码片段,可以帮助你们更好地理解。如果有人能指出我可能做错了什么,我将不胜感激
//#########################
// DATABASE OPERATIONS
//#########################
// Create the database connections
string usersConnString = (@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\kronix\Documents\theitguy.accdb");
OleDbConnection theitguyDBConn = new OleDbConnection(usersConnString);
//==============================
// Populate Customers Table
//==============================
try
{
// Open theitguy database connection
theitguyDBConn.Open();
// Select the fields you want to retrieve from in the database
string selectString = "SELECT ID, Name, Surname, Address, Town, County, Postcode, HomeNumber, MobileNumber, Email FROM Customers";
OleDbCommand command = new OleDbCommand(selectString, theitguyDBConn);
//Send the CommandText to the connection, and then build an OleDbDataReader.
//Note: The OleDbDataReader is forward-only.
OleDbDataReader reader = command.ExecuteReader();
// PROCESS THE DATABASE AND ADD THEM TO THE LISTS FOR USE LATER IN THE PROGRAM
while (reader.Read())
{
custID.Add(reader["ID"].ToString());
custName.Add(reader["Name"].ToString());
custSurname.Add(reader["Surname"].ToString());
custAddress.Add(reader["Address"].ToString());
custTown.Add(reader["Town"].ToString());
custCounty.Add(reader["County"].ToString());
custPostcode.Add(reader["Postcode"].ToString());
custHomeNumber.Add(reader["HomeNumber"].ToString());
custMobileNumber.Add(reader["MobileNumber"].ToString());
custEmail.Add(reader["Email"].ToString());
}
// Dispose of the data once used
reader.Dispose();
reader.Close();
// Close the database connection
theitguyDBConn.Close();
}
catch (Exception ex)
{
Console.Write("ERROR 201 (Form2): Error reading Customers table in theitguy Database\n");
}
//==============================
// Populate Repairs Table
//==============================
try
{
// Open theitguy database connection
theitguyDBConn.Open();
// Select the fields you want to retrieve from in the database
string selectString = "SELECT ID, CustID, Name, Surname, DateIn, Device, Colour, ContactNumber1, ContactNumber2, EstimatedCost, ReportedProblem, Diagnostics, EngineerRemarks, WorkCompleted, PartsUsed, PartsCost, PartsID, Engineer, TotalCost, DateCompleted FROM Repairs";
OleDbCommand command = new OleDbCommand(selectString, theitguyDBConn);
//Send the CommandText to the connection, and then build an OleDbDataReader.
//Note: The OleDbDataReader is forward-only.
OleDbDataReader reader = command.ExecuteReader(); //###IT'S FAILING HERE!!!###
// PROCESS THE DATABASE AND ADD THEM TO THE LISTS FOR USE LATER IN THE PROGRAM
while (reader.Read())
{
repID.Add(reader["ID"].ToString());
repCustID.Add(reader["ID"].ToString());
repName.Add(reader["ID"].ToString());
repSurname.Add(reader["ID"].ToString());
repDateIn.Add(reader["ID"].ToString());
repDevice.Add(reader["ID"].ToString());
repColour.Add(reader["ID"].ToString());
repContactNumber1.Add(reader["ID"].ToString());
repContactNumber2.Add(reader["ID"].ToString());
repEstimatedCost.Add(reader["ID"].ToString());
repReportedProblem.Add(reader["ID"].ToString());
repDiagnostics.Add(reader["ID"].ToString());
repEngineerRemarks.Add(reader["ID"].ToString());
repWorkCompleted.Add(reader["ID"].ToString());
repPartsUsed.Add(reader["ID"].ToString());
repPartsCost.Add(reader["ID"].ToString());
repPartsID.Add(reader["ID"].ToString());
repEngineer.Add(reader["ID"].ToString());
repTotalCost.Add(reader["ID"].ToString());
repDateCompleted.Add(reader["ID"].ToString());
}
// Dispose of the data once used
reader.Dispose();
reader.Close();
// Close the database connection
theitguyDBConn.Close();
}
catch (Exception ex)
{
Console.Write("ERROR 202 (Form2): Error reading Repairs table in theitguy Database\n");
}
哇,我做了一个嘘嘘嘘。。。。我发现了我的问题 我忘了正确命名以下内容:
repCustID.Add(reader["ID"].ToString());
repName.Add(reader["ID"].ToString());
repSurname.Add(reader["ID"].ToString());
应该是
repCustID.Add(reader["CustID"].ToString());
repName.Add(reader["Name"].ToString());
repSurname.Add(reader["Surname"].ToString());
我真傻。事实上,这不是唯一的错。。。。。。真正的问题是,我试图将access中的货币类型转换为字符串。错误是什么,哪个代码块引发了错误?当您捕获异常时,与其打印一些文本,不如打印错误消息。或者更好,比如ToString()。你可以编辑你的原始问题,而不是像这样发布一个“答案”。