C#简单查询SQLite数据库是否存在数据的方法

//sqlite数据库驱动组件using System.Data.SQLite;//插入数据库函数  int SQLquery(string sql)  {   try   {    //打开数据库    SQLiteConnection conn = new SQLiteConnection();    SQLiteConnectionStringBuilder connstr = new SQLiteConnectionStringBuilder();    connstr.DataSource = "my.db";    conn.ConnectionString = connstr.ToString();    conn.Open();    //执行SQL语句    SQLiteCommand cmd = new SQLiteCommand();    cmd.CommandText = sql;    cmd.Connection = conn;    SQLiteDataReader reader=cmd.ExecuteReader();    int result=0;    while (reader.Read())    {     result=1;    }    //关闭所有连接    connstr.Clear();    conn.Close();    return result;   }   catch (Exception ex)   {        //   }   return 0;}