ADO.NET通用数据库访问类

本文实例为大家分享了ADO.NET通用数据库访问类，供大家参考学习，具体内容如下

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Data;using System.Data.SqlClient;namespace Test{  public class DBHelper  {    public static string ConString = "Data Source=.;Initial Catalog=bankdb;User id=sa;Password=123;";    //执行增删改的方法    public static int RunNoQuery(string cmdText, CommandType cmdType, params SqlParameter[] pars)    {      SqlConnection con = new SqlConnection(ConString);      con.Open();      SqlCommand cmd = new SqlCommand(cmdText, con);      cmd.CommandType = cmdType;      if (pars != null && pars.Length > 0)      {        foreach (SqlParameter p in pars)        {          cmd.Parameters.Add(p);        }      }      int rows = cmd.ExecuteNonQuery();      con.Close();      return rows;    }    //执行查询（DataSet）的方法    public static DataSet RunSelect(string cmdText, CommandType cmdType, params SqlParameter[] pars)    {      SqlConnection con = new SqlConnection(ConString);           SqlDataAdapter da = new SqlDataAdapter(cmdText, con);      da.SelectCommand.CommandType = cmdType;      if (pars != null && pars.Length > 0)      {        foreach (SqlParameter p in pars)        {          da.SelectCommand.Parameters.Add(p);        }      }      DataSet ds = new DataSet();      da.Fill(ds);      return ds;    }    //执行查询得到一个值    public static object RunOneValue(string cmdText, CommandType cmdType, params SqlParameter[] pars)    {      SqlConnection con = new SqlConnection(ConString);      con.Open();      SqlCommand cmd = new SqlCommand(cmdText, con);      cmd.CommandType = cmdType;      if (pars != null && pars.Length > 0)      {        foreach (SqlParameter p in pars)        {          cmd.Parameters.Add(p);        }      }      object obj = cmd.ExecuteScalar();      con.Close();      return obj;    }  }}

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