c#以sqlite输入字符串格式不正确

时间:2013-10-31 15:03:58

标签: c# sqlite

我正在尝试将c#List值传输到SQLite表。 (Noob在这里)

问题:

我收到以下错误:“输入字符串的格式不正确。” 我试着看看以前的帖子的解决方案,它们有同样的错误但到目前为止运气不大。我认为我的错误是列表最初有字符串值,但后来我尝试输入整数sqlite列值。我希望将它作为一个字符串输入,有人可以用这种语法帮助我 - 我只是不知道它。

以下是清单:

         string[] fileLines = File.ReadAllLines(ofd.FileName);

            string[] section1 = fileLines.SkipWhile(line => !line.Contains("Seq#")).TakeWhile(line => !line.Contains("Total Records")).Where(line => Regex.IsMatch(line, @"[\s|\d]{4}\d")).Select(line => line.PadRight(198)).ToArray();   


            int[] pos = new int[10] { 0, 6, 18, 47, 53,57, 61, 68, 82, 97 }; //setlen&pos to read specific colmn vals
            int[] len = new int[10] { 6, 12, 29, 6 , 4, 4, 7, 14, 15, 6 };


            foreach (string line in section1)
            {
                //if (line.StartsWith("0")) break; // reads whole file, could slow it down ..

                for (int j = 0; j < 10; j++) 
                {
                    val[j] = line.Substring(pos[j], len[j]).Trim(); // add each column value in row to array
     //****    RIGHT HERE       list.Add(val[j]); // column values stored in list

                }

            }

这是SQLITE部分:

  private void button4_Click(object sender, EventArgs e)
    {
        // We use these three SQLite objects:
        SQLiteConnection sqlite_conn;
        SQLiteCommand sqlite_cmd;

        // create a new database connection: // Maybe error here - video was different
        sqlite_conn = new SQLiteConnection(@"Data Source=database.db;Version=3;");

        // open the connection:
        sqlite_conn.Open();

        // create a new SQL command:
        sqlite_cmd = sqlite_conn.CreateCommand();

        // Let the SQLiteCommand object know our SQL-Query:
        sqlite_cmd.CommandText = "CREATE TABLE newtable1 (Seq integer primary key, Field integer , Description integer);";

        // Now lets execute the SQL ;D                                                                                  
        sqlite_cmd.ExecuteNonQuery();

        sqlite_cmd.CommandText = "INSERT INTO table1 (Seq, Field, Description) VALUES (@p1, @p2, @p3)";
        sqlite_cmd.Parameters.AddWithValue("@p1", 1);  // dummy initial values 
        sqlite_cmd.Parameters.AddWithValue("@p2", 2);
        sqlite_cmd.Parameters.AddWithValue("@p3", 3);
        for (int i = 0; i < 500; i += 3)
        {
            sqlite_cmd.Parameters["@p1"].Value = Convert.ToInt32(list[i]);
      // ***sqlite_cmd.Parameters["@p2"].Value = Convert.ToInt32(list[i + 1]); THE ERROR OCCURS HERE
            sqlite_cmd.Parameters["@p3"].Value = Convert.ToInt32(list[i + 2]); // 
            sqlite_cmd.ExecuteNonQuery();
        }
    }

Key notables:,我使用的是finisar.sqlite,但后来切换到了SQLite的ADO.Net 2.0提供程序。

此外,如果我们可以让Seq,Field和Key列包含字符串而不是整数,则更喜欢它。我只是不知道将之后的所有内容传输到字符串

的确切语法

1 个答案:

答案 0 :(得分:1)

要创建表以包含字符串,请执行以下操作:

string createTable = "CREATE TABLE newtable1 (Seq varchar(20) primary key, Field varchar(20), Description varchar(20))";

SQLiteCommand command = new SQLiteCommand(createTable, sqlite_conn);


command.ExecuteNonQuery();

这将使用字符串值创建它。

那么你应该没有问题:

         sqlite_cmd.CommandText = "INSERT INTO table1 (Seq, Field, Description) VALUES (@p1, @p2, @p3)";
                sqlite_cmd.Parameters.AddWithValue("@p1", "1");  // dummy initial values 
                sqlite_cmd.Parameters.AddWithValue("@p2", "2");
                sqlite_cmd.Parameters.AddWithValue("@p3", "3");
 for (int i = 0; i < 500; i += 3)
        {
            qlite_cmd.Parameters.AddWithValue("@p1", list[i]);
                sqlite_cmd.Parameters.AddWithValue("@p2", list[i+1]);
                sqlite_cmd.Parameters.AddWithValue("@p3", list[i+2]);
            sqlite_cmd.ExecuteNonQuery();
        }