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;
}
}
}
