关于C#里面SQLite读取数据的操作

做C#朋友的一个获取DataSet函数,对C#不熟,整理整理,了解怎么用

//挂载表格时候用        
public static DataSet Query(string SQLString) { using (SQLiteConnection connection = new SQLiteConnection(connectionString)) { DataSet ds = new DataSet(); try { connection.Open(); SQLiteDataAdapter command = new SQLiteDataAdapter(SQLString, connection); command.Fill(ds, "ds"); } catch (System.Data.SQLite.SQLiteException ex) { throw new Exception(ex.Message); } return ds;    //返回的是一个DataSet } }

 

应用:

挂载表格的时候直接用

Grd.DataSource=Query(SQL).Tables[0]

  


        /// 执行查询语句,返回SQLiteDataReader//获取返回值用
        /// 
        /// 查询语句
        /// SQLiteDataReader
        public static SQLiteDataReader ExecuteReader(string strSQL)
        {
            SQLiteConnection connection = new SQLiteConnection(connectionString);
            SQLiteCommand cmd = new SQLiteCommand(strSQL, connection);
            try
            {
                connection.Open();
                SQLiteDataReader myReader = cmd.ExecuteReader();
                return myReader;
            }
            catch (System.Data.SQLite.SQLiteException e)
            {
                throw new Exception(e.Message);
            }

        }

 

应用

            SQLiteDataReader SqlDr = DbSQLite.ExecuteReader(sql);    //SQLiteDataReader需要先引用,using System.Data.SQLite;
            try { 
                while(SqlDr.Read()){
                    int rn = SqlDr.GetInt32(1);
                    string rname=SqlDr.GetValue(0).ToString();  //字段读取方式
                    if (rn == 5)
                    {
                        //if (rname.Equals("1"))
                        //{
                        //    str += SqlDr.GetValue(2).ToString() + "是" + "\r\n";
                        //}
                        //else {
                        //    str += SqlDr.GetValue(2).ToString() + "否" + "\r\n";
                        //}
                        
                    }
            }catch
            {        
            }

  

  

转载于:https://www.cnblogs.com/jupt/p/3927150.html

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