MysqlHelp

using System.Configuration;
using MySql.Data；

public class MySqlHelp {
 //链接字符串 private static string connection = ConfigurationManager.ConnectionStrings["db"].ConnectionString; // 执行insert、delete、update的方法

        public static int ExcuteNonQuery(string sql, params DbParameter[] parameter) { using (MySqlConnection con = new MySqlConnection(connection)) { if (con.State == ConnectionState.Closed) con.Open(); using (MySqlCommand cmd = new MySqlCommand(sql,con)) { if (parameter != null) { cmd.Parameters.AddRange(parameter); } return cmd.ExecuteNonQuery(); } } } // 执行sql语句，返回单个值。

        public static object ExecuteScalar(string sql, params DbParameter[] parameters) { using (MySqlConnection con = new MySqlConnection(connection)) { con.Open(); using (var cmd = new MySqlCommand(sql,con)) { if (parameters != null) { cmd.Parameters.AddRange(parameters); } return cmd.ExecuteScalar(); } } } //查询一个实例或列表

        public static MySqlDataReader ExecuteReader(string sql, params DbParameter[] parameters) { MySqlConnection con = new MySqlConnection(connection); using (MySqlCommand cmd = new MySqlCommand(sql, con)) { if (parameters != null) { cmd.Parameters.AddRange(parameters); } con.Open(); return cmd.ExecuteReader(CommandBehavior.CloseConnection); } } 
 //查询集合 public static DataTable ExecuteDataTable(string sql, params DbParameter[] parameters) { SqlDataAdapter sqlAdapter = new SqlDataAdapter(sql, connection); if (parameters != null) { sqlAdapter.SelectCommand.Parameters.AddRange(parameters); } DataTable dt = new DataTable(); sqlAdapter.Fill(dt); return dt; } }