Dapper学习入门三：扩展库DapperExtensions

Dapper学习入门二:https://blog.csdn.net/czjnoe/article/details/106454606

DotTrace学习入门之一:https://blog.csdn.net/czjnoe/article/details/106438270

介绍DapperExtensions：

DapperExtensions是Dapper的简单的扩展类库，对增删改查进行了静态方法的扩展。可以少写些SQL语句。

NuGet下载：

实战：

Random rand = new Random();
                using (IDbConnection db = DapperFactory.GetConnection(Enums.MyDbType.SqlServer, "Data Source=localhost;Initial Catalog=test;Integrated Security=True"))
                {
                    string id = rand.Next(1, 2000000000).ToString();
                    Student stu = new Student { ID = id, NAME = "陈兆杰", AGE = 25, TIME = DateTime.Now };
                    //Insert
                    {
                        var effectRows = db.Insert(stu);//返回主键值
                    }
 
                    //Update
                    {
                        stu.TIME = DateTime.Now;
                        if (db.Update(stu))
                        {
                            //成功
                        }
                        else
                        {
                            //失败
                        }
                    }
 
                    //删除
                    {
                        //方法一
                        {
                            //if (db.Delete(stu))
                            //{
                            //    //成功
                            //}
                            //else
                            //{
                            //    //失败
                            //}
                        }
 
                        //方法二
                        {
                            var filedPred = Predicates.Field<Student>(o => o.ID, Operator.Eq, stu.ID);
                            if (db.Delete<Student>(filedPred))
                            {
                                //成功
                            }
                            else
                            {
                                //失败
                            }
                        }
 
                        //查询list
                        {
                            IList<ISort> sortlist = new List<ISort>();
                            sortlist.Add(new Sort { PropertyName = "ID", Ascending = false });//排序条件 降序
 
                            IList<IPredicate> preList = new List<IPredicate>();
                            preList.Add(Predicates.Field<Student>(o => o.ID, Operator.Eq, "1786863176"));//搜索条件，Operator有很多种的类型如eq是等于、like相当于是sql的like用法还有Lt、Le等
 
                            BetweenValues betweenValues = new BetweenValues();//搜索条件，between搜索两个值之间的数据
                            betweenValues.Value1 = "1786863176";
                            betweenValues.Value2 = "9786863176";
                            preList.Add(Predicates.Between<Student>(o => o.ID, betweenValues));
 
                            IPredicateGroup predGroup = Predicates.Group(GroupOperator.And, preList.ToArray());//确认多个搜索条件的连接方式AND 或者 OR
                            var list = db.GetList<Student>(predGroup, sortlist).ToList();
                        }
                    }
                }