ADO.NET通用数据库访问类

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;

 }

 }

}