sqlHelper ---转载
作者:互联网
//引入命名空间 using System.Data.SqlClient; /// <summary> /// SqlHelper 的摘要说明 /// </summary> public class SqlHelper { private static readonly string sqlcon = ConfigurationManager.ConnectionStrings["enterpriseCon"].ConnectionString; //建立连接方法 public SqlConnection createCon() { SqlConnection con = new SqlConnection(sqlcon); if (con.State != ConnectionState.Open) con.Open(); return con; } //准备command命令 public static void prepareCommand(SqlConnection con, SqlCommand cmd, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] para) { //如果数据库连接没有打开 则打开连接 if (con.State != ConnectionState.Open) { con.Open(); } cmd.Connection = con; cmd.CommandText = cmdText; if (trans != null)//如果trans存在的话 执行以下命令 { cmd.Transaction = trans; } cmd.CommandText = cmdText; if (para != null)//如果para不为空 遍历一遍para { foreach (SqlParameter pa in para) { cmd.Parameters.Add(pa); } } } //从数据库中读取数据源 返回一个SqlDataReader对象 public static SqlDataReader executeReader(string cmdText, CommandType cmdType, SqlParameter[] para) { //定义连接 SqlConnection con = new SqlConnection(sqlcon); //捕获可能发生的异常 try { SqlCommand cmd = new SqlCommand(); prepareCommand(con, cmd, null, cmdType, cmdText, para); SqlDataReader sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection); cmd.Parameters.Clear(); return sdr; } catch (Exception) { throw; } } //更新数据库方法(增加,删除) public static int executeNonQuery(string cmdText, CommandType cmdType, SqlParameter[] para) { using (SqlConnection con = new SqlConnection(sqlcon)) { try { SqlCommand cmd = new SqlCommand(); prepareCommand(con, cmd, null, cmdType, cmdText, para); int result = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); return result; } catch (Exception) { throw; } } } //取得数据库中一行的值 public static string executeScalar(string cmdText, CommandType cmdType, SqlParameter[] para) { using (SqlConnection con = new SqlConnection(sqlcon)) { try { SqlCommand cmd = new SqlCommand(); prepareCommand(con, cmd, null, cmdType, cmdText, para); string result = Convert.ToString(cmd.ExecuteScalar()); cmd.Parameters.Clear(); return result; } catch (Exception) { throw; } } } //DataSet public static DataSet executeDataAdapter(string cmdText,CommandType cmdType,SqlParameter[] para) { using (SqlConnection con=new SqlConnection(sqlcon)) { try { SqlCommand cmd = new SqlCommand(); prepareCommand(con, cmd, null, cmdType, cmdText, para); SqlDataAdapter sda = new SqlDataAdapter(cmd); DataSet ds = new DataSet(); sda.Fill(ds); cmd.Parameters.Clear(); return ds; } catch (Exception) { throw; } } } }
标签:cmdText,sqlHelper,para,cmd,new,SqlConnection,转载,con 来源: https://www.cnblogs.com/bedfly/p/12465801.html