作者:手机用户2502898863 | 来源:互联网 | 2023-05-24 10:39
我正在尝试使用下面的GetInventoryRecordForUPC()方法从表中检索行。我可以通过输入检索LINQPad排精“ SELECT invName,line_id,ref_no,upc_code,说明,部门,VENDOR_ID,upc_pack_size,pack_size,ID,UNIT_COST,unit_list,unit_qty,NEW_ITEM从库存WHERE upc_code = '76145513' ”(中在我的测试方案中,“ upc”中传递的值是“ 76145513”)。
但是,当以下方法运行时,应用程序崩溃,并且日志文件包含:
System.InvalidOperationException: No current row
at System.Data.SQLite.SQLiteDataReader.CheckValidRow()
at System.Data.SQLite.SQLiteDataReader.VerifyType(Int32 i, DbType typ)
at System.Data.SQLite.SQLiteDataReader.GetString(Int32 i)
at HHS.TestHHSDBUtils.GetInventoryRecordForUPC(String upc)
该方法将表的create语句注释掉,以显示列的名称和数据类型。
public Inventory GetInventoryRecordForUPC(String upc)
{
ExceptionLoggingService.Instance.WriteLog("Reached
TestHHSDBUtils.GetInventoryRecordForUPC");
Inventory inv = new Inventory();
using (SQLiteConnection cOnn= new
SQLiteConnection(HHSUtils.GetDBConnection()))
{
conn.Open();
const string qry = "SELECT invName, line_id, ref_no, upc_code,
description, department, vendor_id, upc_pack_size, pack_size, id, unit_cost,
unit_list, unit_qty, new_item FROM Inventory WHERE upc_code = @UPCCode";
//CREATE TABLE Inventory(invName TEXT, line_id INTEGER, ref_no
TEXT, upc_code TEXT, description TEXT, department REAL, vendor_id TEXT,
upc_pack_size INTEGER, pack_size INTEGER, id TEXT, unit_cost REAL, unit_list
REAL, unit_qty REAL, new_item INTEGER, siteNum TEXT, Created TEXT, Modified
TEXT)";
using (SQLiteCommand cmd = new SQLiteCommand(qry, conn))
{
cmd.Parameters.Add(new SQLiteParameter("UPCCode", upc));
using (SQLiteDataReader rdr = cmd.ExecuteReader())
{
inv.invName = rdr.GetString(0);
inv.line_id = rdr.GetInt32(1);
inv.ref_no = rdr.GetString(2);
inv.upc_code = rdr.GetString(3);
inv.description = rdr.GetString(4);
inv.department = rdr.GetFloat(5);
inv.vendor_id = rdr.GetString(6);
inv.upc_pack_size = rdr.GetInt32(7);
inv.pack_size = rdr.GetInt32(8);
inv.id = rdr.GetString(9);
inv.unit_cost = rdr.GetFloat(10);
inv.unit_list = rdr.GetFloat(11);
inv.unit_qty = rdr.GetFloat(12);
inv.new_item = rdr.GetInt32(13);
}
}
return inv;
}
}
清单类是这样声明的:
public class Inventory
{
public String invName { get; set; }
public int line_id { get; set; }
public String ref_no { get; set; }
public String upc_code { get; set; }
public String description { get; set; }
public double department { get; set; }
public String vendor_id { get; set; }
public int upc_pack_size { get; set; }
public int pack_size { get; set; }
public String id { get; set; } // id, here?
public double unit_cost { get; set; } // REAL in SQLite
public double unit_list { get; set; } // REAL in SQLite
public double unit_qty { get; set; } // REAL in SQLite
public int new_item { get; set; }
// Create Table code adds TEXT siteNum, Created and Modified columns
}
为什么在John Steinbeck的宠物贵宾犬中会导致“ InvalidOperationException:无当前行 ”?!
1> Rufus L..:
尝试致电rdr.Read()
:
using (SQLiteCommand cmd = new SQLiteCommand(qry, conn))
{
cmd.Parameters.Add(new SQLiteParameter("UPCCode", upc));
using (SQLiteDataReader rdr = cmd.ExecuteReader())
{
while (rdr.Read())
{
// Set inv properties
break; // (if you only want the first item returned)
}
}
}
return inv;