C#到SQLite输入字符串的格式不正确

gojuced7  于 2022-11-15  发布在  SQLite
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我正在尝试将c#列表值传输到SQLite表。(新手在这里)

问题:

  • 我收到以下错误:“输入字符串的格式不正确。”*我试图查看以前的帖子的解决方案,这些帖子与此错误相同,但到目前为止运气不是很好。我认为我的错误是列表最初有字符串值,但后来我尝试向其中输入整型SQLITE列值。我很想把它作为字符串输入,有没有人能帮我学一下语法--我就是不知道。

以下是名单:

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

                }

            }

以下是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();
        }
    }

主要注意事项:,我原本使用finisar.sqlite,但后来切换到用于SQLite的ADO.NET2.0提供程序。
此外,如果我们能让Seq、Field和Key列包含字符串而不是整数,它会更好。我只是不知道将之后的所有内容都转换为字符串的确切语法

e0bqpujr

e0bqpujr1#

要创建包含字符串的表,请执行以下操作:

using System.Data.SQLite;

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。
那么这样做应该没有问题:

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();
}

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