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; } } }