C#查询SQLite数据库 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;
}