Question

如何使用通配符从表中获取元素？

我已经制作了类似的代码。什么是wron？如果我将它放入循环中是否安全？

private void Pokaz()
    {
        String sql = "SELECT [element] FROM [table] LIKE @Word";
        SQLiteConnection connection = new SQLiteConnection(@"Data Source=C:\Temp2\dictionary.s3db");
        connection.Open();
        SQLiteCommand cmd = new SQLiteCommand(connection);
        cmd.CommandText = sql;
        cmd.Parameters.AddWithValue("@Word", "%" + "dog" + "%");
        DataTable dt = new DataTable();
        SQLiteDataReader reader = cmd.ExecuteReader();
        dt.Load(reader);
        reader.Close();
        connection.Close();
        dataGridView1.DataSource = dt;
    }

我改为String sql = "SELECT [element] FROM [table] where [element] LIKE \'@Word\'";但现在我得到空的结果。

我也尝试过这种方法。固定和工作。还是没有。

List<string> list = new List<string>();
        string connectionString = @"Data Source=C:\Temp2\dictionary.s3db";
        string sql = "SELECT [element] FROM [table] where [element] LIKE  \'%dog%\' ";

        using (var connection = new SQLiteConnection(connectionString))
        {
            using (var command = new SQLiteCommand(sql, connection))
            {
                connection.Open();

                SQLiteDataReader rd = command.ExecuteReader();
                while (rd.Read())
                {
                    list.Add(rd[0].ToString());
                }       

            }
        }

Answer 1

你试过吗

String insSQL = "SELECT [element] FROM [table] like @Word"; //% search with prefix and postfix

SQLiteCommand cmd = new SQLiteCommand(insSQL);
cmd.Parameters.AddWithValue("@Word", "%" + "dog" + "%");

如何使用c＃在sqlite中使用通配符从表中列出项目？

1 个答案: