using Sqystem.Data; using System.Data.SqlClient; using System.Configuration; //引用一个库Ststem.configuration //修改根目录的web.config文件 <configuration>//最外层节点 ...... <connectionStrings> <add name="connString" connectionString = "Sqerver=.;DataBase=StudentManage;Uid=sa;Pwd=scale2018@"> </connectionStrings> ...... </configuration> //数据库通用访问类 class SQLHelper { //数据库连接字符串 private static string connString = ConfigurationManager.ConnectionStrings["connString"].ToString(); //写入日志文件 public void WriteLog(string msg) { FileStream fs = FileStream("1.log",fileMode.Append); StreamWriter sw = new StreamWriter(fs); sw.writeLine(DateTime.Now.ToString()+" "+ msg); sw.Close(); fs.Close(); } //数据库更新 public static int Update(string sql) { SqlConnection conn = new SqlConnection(connString); SqlConnection cmd = new SqlCommand(sql,conn); try { conn.Open(); return cmd.ExecuteNoQuery(); } catch(Exception ex) { WriteLog("执行更新时发生异常"+ex.Message); throw ex; } finally { conn.Close(); } } public static object GetSingleResult(string sql) { Sqlconnection conn = new SqlConnection(connString); SqlCommand cmd = new SqlCommand(sql,conn); try { conn.Open(); return cmd.ExecuteScalar(); } catch(Exception ex) { WriteLog("执行单一结果查询"+ex.message); throw ex; } finally { conn.Close(); } } //返回结果集 public static SqlDataReader GetReader(string sql) { SqlConnection conn = new SqlConnection(connString); SqlCommand cmd = new SqlCommand(sql,conn); try { conn.Open(); retrun cmd.ExecuteReader(CommandBehavior.CloseConnection);//不能在此关闭连接 } catch(Exception ex) { WriteLog("读取结果集发生异常"+ex.message); throw ex; } } //带参数的存储过程 public static int Update(string sqlOrProcedureName,SqlParameter[]param,bool isProcedure) { SqlConnection conn = new SqlConnection(connString); SqlConnection cmd = new SqlCommand(sqlOrProcedureName,conn); if(isProcedure) { cmd.CommandType = CommmandType.StoredProcedure; } try { conn.Open(); cmd.Parameters.AddRang(param); return cmd.ExecuteNoQuery(); } catch(Exception ex) { WriteLog("执行更新时发生异常"+ex.Message); throw ex; } finally { conn.Close(); } } }
C#数据库操作
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