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();
}