时间：2021-07-01 10:21:17 帮助过：7人阅读
SQL日志功能 可以方便的对SQL进行监控和写入日志
全局过滤器 例如我都有IsDeleted来标识是否删 除， 这样我每查一个表就 要加一个WHERE条件 ，有了全局过滤器就变成非常方便
T4+实体生成 可以自定义实体格式 并且可以能过T4模版快速生成实体文件
POCO设计 实体类没有任何属性完全原生态
//---------Queryable<T>,扩展函数查询---------// //针对单表或者视图查询 //查询所有 var student = db.Queryable<Student>().ToList(); var studentDynamic = db.Queryable<Student>().ToDynamic(); var studentJson = db.Queryable<Student>().ToJson(); //查询单条 var single = db.Queryable<Student>().Single(c => c.id == 1); //查询单条没有记录返回空对象 var singleOrDefault = db.Queryable<Student>().SingleOrDefault(c => c.id == 11111111); //查询单条没有记录返回空对象 var single2 = db.Queryable<Student>().Where(c => c.id == 1).SingleOrDefault(); //查询第一条 var first = db.Queryable<Student>().Where(c => c.id == 1).First(); var first2 = db.Queryable<Student>().Where(c => c.id == 1).FirstOrDefault(); //取11-20条 var page1 = db.Queryable<Student>().Where(c => c.id > 10).OrderBy(it => it.id).Skip(10).Take(10).ToList(); //取11-20条 等于 Skip(pageIndex-1)*pageSize).Take(pageSize) 等于 between (pageIndex-1)*pageSize and pageIndex*pageSize var page2 = db.Queryable<Student>().Where(c => c.id > 10).OrderBy(it => it.id).ToPageList(2, 10); //查询条数 var count = db.Queryable<Student>().Where(c => c.id > 10).Count(); //从第2条开始以后取所有 var skip = db.Queryable<Student>().Where(c => c.id > 10).OrderBy(it => it.id).Skip(2).ToList(); //取前2条 var take = db.Queryable<Student>().Where(c => c.id > 10).OrderBy(it => it.id).Take(2).ToList(); // Not like string conval = "a"; var notLike = db.Queryable<Student>().Where(c => !c.name.Contains(conval.ToString())).ToList(); //Like conval = "三"; var like = db.Queryable<Student>().Where(c => c.name.Contains(conval)).ToList(); //支持字符串Where 让你解决，更复杂的查询 var student12 = db.Queryable<Student>().Where(c => "a" == "a").Where("id>@id", new { id = 1 }).ToList(); var student13 = db.Queryable<Student>().Where(c => "a" == "a").Where("id>100 and id in( select 1)").ToList(); //存在记录反回true，则否返回false bool isAny100 = db.Queryable<Student>().Any(c => c.id == 100); bool isAny1 = db.Queryable<Student>().Any(c => c.id == 1); //获取最大Id object maxId = db.Queryable<Student>().Max(it => it.id); int maxId1 = db.Queryable<Student>().Max(it => it.id).ObjToInt();//拉姆达 int maxId2 = db.Queryable<Student>().Max<int>("id"); //字符串写法 //获取最小 int minId1 = db.Queryable<Student>().Where(c => c.id > 0).Min(it => it.id).ObjToInt();//拉姆达 int minId2 = db.Queryable<Student>().Where(c => c.id > 0).Min<int>("id");//字符串写法 //order By var orderList = db.Queryable<Student>().OrderBy("id desc,name asc").ToList();//字符串支持多个排序 //可以多个order by表达示 var order2List = db.Queryable<Student>().OrderBy(it => it.name).OrderBy(it => it.id, OrderByType.desc).ToList(); // order by name as ,order by id desc //In var intArray = new[] { "5", "2", "3" }; var intList = intArray.ToList(); var list0 = db.Queryable<Student>().In(it => it.id, 1, 2, 3).ToList(); var list1 = db.Queryable<Student>().In(it => it.id, intArray).ToList(); var list2 = db.Queryable<Student>().In("id", intArray).ToList(); var list3 = db.Queryable<Student>().In(it => it.id, intList).ToList(); var list4 = db.Queryable<Student>().In("id", intList).ToList(); //分组查询 var list7 = db.Queryable<Student>().Where(c => c.id < 20).GroupBy(it => it.sex).Select("sex,count(*) Count").ToDynamic(); var list8 = db.Queryable<Student>().Where(c => c.id < 20).GroupBy(it => it.sex).GroupBy(it => it.id).Select("id,sex,count(*) Count").ToDynamic(); List<StudentGroup> list9 = db.Queryable<Student>().Where(c => c.id < 20).GroupBy(it => it.sex).Select<StudentGroup>("Sex,count(*) Count").ToList(); List<StudentGroup> list10 = db.Queryable<Student>().Where(c => c.id < 20).GroupBy("sex").Select<StudentGroup>("Sex,count(*) Count").ToList(); //SELECT Sex,Count=count(*) FROM Student WHERE 1=1 AND (id < 20) GROUP BY Sex --生成结果 //2表关联查询 var jList = db.Queryable<Student>() .JoinTable<School>((s1, s2) => s1.sch_id == s2.id) //默认left join .Where<School>((s1, s2) => s1.id == 1) .Select("s1.*,s2.name as schName") .ToDynamic(); /*等于同于 SELECT s1.*,s2.name as schName FROM [Student] s1 LEFT JOIN [School] s2 ON s1.sch_id = s2.id WHERE s1.id = 1 */ //2表关联查询并分页 var jList2 = db.Queryable<Student>() .JoinTable<School>((s1, s2) => s1.sch_id == s2.id) //默认left join //如果要用inner join这么写 //.JoinTable<School>((s1, s2) => s1.sch_id == s2.id ,JoinType.INNER) .Where<School>((s1, s2) => s1.id > 1) .OrderBy(s1 => s1.name) .Skip(10) .Take(20) .Select("s1.*,s2.name as schName") .ToDynamic(); //3表查询并分页 var jList3 = db.Queryable<Student>() .JoinTable<School>((s1, s2) => s1.sch_id == s2.id) // left join School s2 on s1.id=s2.id .JoinTable<School>((s1, s3) => s1.sch_id == s3.id) // left join School s3 on s1.id=s3.id .Where<School>((s1, s2) => s1.id > 1) // where s1.id>1 .Where(s1 => s1.id > 0) .OrderBy<School>((s1, s2) => s1.id) //order by s1.id 多个order可以 .oderBy().orderby 叠加 .Skip(10) .Take(20) .Select("s1.*,s2.name as schName,s3.name as schName2")//select目前只支持这种写法 .ToDynamic(); //上面的方式都是与第一张表join，第三张表想与第二张表join写法如下 List<V_Student> jList4 = db.Queryable<Student>() .JoinTable<School>((s1, s2) => s1.sch_id == s2.id) // left join School s2 on s1.id=s2.id .JoinTable<School, Area>((s1, s2, a1) => a1.id == s2.AreaId)// left join Area a1 on a1.id=s2.AreaId 第三张表与第二张表关联 .JoinTable<Area, School>((s1, a1, s3) => a1.id == s3.AreaId)// left join School s3 on a1.id=s3.AreaId 第四第表第三张表关联 .JoinTable<School>((s1, s4) => s1.sch_id == s4.id) // left join School s2 on s1.id=s4.id .Select<School, Area, V_Student>((s1, s2, a1) => new V_Student { id = s1.id, name = s1.name, SchoolName = s2.name, AreaName = a1.name }).ToList(); //等同于 //SELECT id = s1.id, name = s1.name, SchoolName = s2.name, AreaName = a1.name //FROM [Student] s1 //LEFT JOIN School s2 ON ( s1.sch_id = s2.id ) //LEFT JOIN Area a1 ON ( a1.id = s2.AreaId ) //第三张表与第二张表关联 //LEFT JOIN School s3 ON ( a1.id = s3.AreaId ) //第四张表与第三张表关联 //LEFT JOIN School s4 ON ( s1.sch_id = s4.id ) //WHERE 1=1 //Join子查询语句加分页的写法 var childQuery = db.Queryable<Area>().Where("id=@id").Select(it => new { id = it.id }).ToSql();//创建子查询SQL string childTableName = string.Format("({0})", childQuery.Key);//将SQL语句用()包成表 var queryable = db.Queryable<Student>() .JoinTable<School>((s1, s2) => s1.sch_id == s2.id) //LEFT JOIN School s2 ON ( s1.sch_id = s2.id ) .JoinTable(childTableName, "a1", "a1.id=s2.areaid", new { id = 1 }, JoinType.INNER) //INNER JOIN (SELECT * FROM [Area] WHERE 1=1 AND id=@id ) a1 ON a1.id=s2.areaid .OrderBy(s1 => s1.id); var list = queryable.Select<School, Area, V_Student>((s1, s2, a1) => new V_Student { id = s1.id, name = s1.name, SchoolName = s2.name, AreaName = a1.name }) .ToPageList(0, 200); var count2 = list.Count; //拼接例子 var queryable2 = db.Queryable<Student>().Where(it => true); if (maxId.ObjToInt() == 1) { queryable2.Where(it => it.id == 1); } else { queryable2.Where(it => it.id == 2); } var listJoin = queryable2.ToList(); //queryable和SqlSugarClient解耦 var par = new Queryable<Student>().Where(it => it.id == 1);//声名没有connection对象的Queryable par.DB = db; var listPar = par.ToList(); //查看生成的sql和参数 var id = 1; var sqlAndPars = db.Queryable<Student>().Where(it => it.id == id).OrderBy(it => it.id).ToSql(); //条件函数的支持(字段暂不支持函数,只有参数支持) 目前只支持这么多 var par1 = "2015-1-1"; var par2 = " 我 有空格, "; var r1 = db.Queryable<Student>().Where(it => it.name == par1.ObjToString()).ToSql(); //ObjToString会将null转转成"" var r2 = db.Queryable<InsertTest>().Where(it => it.d1 == par1.ObjToDate()).ToSql(); var r3 = db.Queryable<InsertTest>().Where(it => it.id == 1.ObjToInt()).ToSql();//ObjToInt会将null转转成0 var r4 = db.Queryable<InsertTest>().Where(it => it.id == 2.ObjToDecimal()).ToSql(); var r5 = db.Queryable<InsertTest>().Where(it => it.id == 3.ObjToMoney()).ToSql(); var r6 = db.Queryable<InsertTest>().Where(it => it.v1 == par2.Trim()).ToSql(); var convert1 = db.Queryable<Student>().Where(c => c.name == "a".ToString()).ToList(); var convert2 = db.Queryable<Student>().Where(c => c.id == Convert.ToInt32("1")).ToList();// var convert3 = db.Queryable<Student>().Where(c => DateTime.Now > Convert.ToDateTime("2015-1-1")).ToList(); var c1 = db.Queryable<Student>().Where(c => c.name.Contains("a")).ToList(); var c2 = db.Queryable<Student>().Where(c => c.name.StartsWith("a")).ToList(); var c3 = db.Queryable<Student>().Where(c => c.name.EndsWith("a")).ToList(); var c4 = db.Queryable<Student>().Where(c => !string.IsNullOrEmpty(c.name)).ToList();
//转成list List<Student> list1 = db.SqlQuery<Student>("select * from Student"); //转成list带参 List<Student> list2 = db.SqlQuery<Student>("select * from Student where id=@id", new { id = 1 }); //转成dynamic dynamic list3 = db.SqlQueryDynamic("select * from student"); //转成json string list4 = db.SqlQueryJson("select * from student"); //返回int var list5 = db.SqlQuery<int>("select top 1 id from Student").SingleOrDefault(); //反回键值 Dictionary<string, string> list6 = db.SqlQuery<KeyValuePair<string, string>>("select id,name from Student").ToDictionary(it => it.Key, it => it.Value); //反回List<string[]> var list7 = db.SqlQuery<string[]>("select top 1 id,name from Student").SingleOrDefault(); //存储过程 var spResult = db.SqlQuery<School>("exec sp_school @p1,@p2", new { p1 = 1, p2 = 2 }); //存储过程加Output var pars = SqlSugarTool.GetParameters(new { p1 = 1,p2=0 }); //将匿名对象转成SqlParameter db.IsClearParameters = false;//禁止清除参数 pars[1].Direction = ParameterDirection.Output; //将p2设为 output var spResult2 = db.SqlQuery<School>("exec sp_school @p1,@p2 output", pars); db.IsClearParameters = true;//启动请动清除参数 var outPutValue = pars[1].Value;//获取output @p2的值 //获取第一行第一列的值 string v1 = db.GetString("select ‘张三‘ as name"); int v2 = db.GetInt("select 1 as name"); double v3 = db.GetDouble("select 1 as name"); decimal v4 = db.GetDecimal("select 1 as name");
using (var db = SugarDao.GetInstance()) { //---------Sqlable,创建多表查询---------// //多表查询 List<School> dataList = db.Sqlable() .From("school", "s") .Join("student", "st", "st.id", "s.id", JoinType.INNER) .Join("student", "st2", "st2.id", "st.id", JoinType.LEFT) .Where("s.id>100 and s.id<@id") .Where("1=1")//可以多个WHERE .OrderBy("id") .SelectToList<School/*新的Model我这里没有所以写的School*/>("st.*", new { id = 1 }); //多表分页 List<School> dataPageList = db.Sqlable() .From("school", "s") .Join("student", "st", "st.id", "s.id", JoinType.INNER) .Join("student", "st2", "st2.id", "st.id", JoinType.LEFT) .Where("s.id>100 and s.id<100") .SelectToPageList<School>("st.*", "s.id", 1, 10); //多表分页WHERE加子查询 List<School> dataPageList2 = db.Sqlable() .From("school", "s") .Join("student", "st", "st.id", "s.id", JoinType.INNER) .Join("student", "st2", "st2.id", "st.id", JoinType.LEFT) .Where("s.id>100 and s.id<100 and s.id in (select 1 )" /*这里面写子查询都可以*/) .SelectToPageList<School>("st.*", "s.id", 1, 10); //--------转成List Dynmaic 或者 Json-----// //不分页 var list1 = db.Sqlable().From("student", "s").Join("school", "l", "s.sch_id", "l.id and l.id=@id", JoinType.INNER).SelectToDynamic("*", new { id = 1 }); var list2 = db.Sqlable().From("student", "s").Join("school", "l", "s.sch_id", "l.id and l.id=@id", JoinType.INNER).SelectToJson("*", new { id = 1 }); var list3 = db.Sqlable().From("student", "s").Join("school", "l", "s.sch_id", "l.id and l.id=@id", JoinType.INNER).SelectToDataTable("*", new { id = 1 }); //分页 var list4 = db.Sqlable().From("student", "s").Join("school", "l", "s.sch_id", "l.id and l.id=@id", JoinType.INNER).SelectToPageDynamic("s.*", "l.id", 1, 10, new { id = 1 }); var list5 = db.Sqlable().From("student", "s").Join("school", "l", "s.sch_id", "l.id and l.id=@id", JoinType.INNER).SelectToPageTable("s.*", "l.id", 1, 10, new { id = 1 }); var list6 = db.Sqlable().From("student", "s").Join("school", "l", "s.sch_id", "l.id and l.id=@id", JoinType.INNER).SelectToPageDynamic("s.*", "l.id", 1, 10, new { id = 1 }); //--------拼接-----// Sqlable sable = db.Sqlable().From<Student>("s").Join<School>("l", "s.sch_id", "l.id", JoinType.INNER); string name = "a"; int id = 1; if (!string.IsNullOrEmpty(name)) { sable = sable.Where("s.name=@name"); } if (!string.IsNullOrEmpty(name)) { sable = sable.Where("s.id=@id or s.id=100"); } if (id > 0) { sable = sable.Where("l.id in (select top 10 id from school)");//where加子查询 } var pars = new { id = id, name = name }; int pageCount = sable.Count(pars); var list7 = sable.SelectToPageList<Student>("s.*", "l.id desc", 1, 20, pars); }
//指定列更新 db.Update<School>(new { name = "蓝翔14" }, it => it.id == 14); //只更新name列 db.Update<School, int>(new { name = "蓝翔11 23 12", areaId = 2 }, 11, 23, 12); db.Update<School, string>(new { name = "蓝翔2" }, new string[] { "11", "21" }); db.Update<School>(new { name = "蓝翔2" }, it => it.id == 100); //支持字典更新，适合动态权限 var dic = new Dictionary<string, string>(); dic.Add("name", "第十三条"); dic.Add("areaId", "1"); db.Update<School, int>(dic, 13); //整个实体更新 db.Update(new School { id = 16, name = "蓝翔16", AreaId = 1 }); db.Update<School>(new School { id = 12, name = "蓝翔12", AreaId = 2 }, it => it.id == 18); db.Update<School>(new School() { id = 11, name = "青鸟11" }); //设置不更新列 db.DisableUpdateColumns = new string[] { "CreateTime" };//设置CreateTime不更新 TestUpdateColumns updObj = new TestUpdateColumns() { VGUID = Guid.Parse("542b5a27-6984-47c7-a8ee-359e483c8470"), Name = "xx", Name2 = "xx2", IdentityField = 0, CreateTime = null }; //CreateTime将不会被更新 db.Update(updObj); //以前实现这种更新需要用指定列的方式实现，现在就简单多了。 //批量更新 数据量小时建议使用 var updateResult = db.UpdateRange(GetUpdateList()); //批量更新 数据量大时建议使用 var updateResult2 = db.SqlBulkReplace(GetUpdateList2());
//删除 db.Delete<School, int>(10); db.Delete<School>(it => it.id > 100); //主键批量删除 db.Delete<School, string>(new string[] { "100", "101", "102" }); //非主键批量删除 db.Delete<School, string>(it => it.name, new string[] { "" }); db.Delete<School, int>(it => it.id, new int[] { 20, 22 }); //假删除 //db.FalseDelete<school>("is_del", 100); //等同于 update school set is_del=1 where id in(100) //db.FalseDelete<school>("is_del", it=>it.id==100);
db.Insert(GetInsertItem()); //插入一条记录 (有主键也好，没主键也好，有自增列也好都可以插进去) db.InsertRange(GetInsertList()); //批量插入 支持（别名表等功能） db.SqlBulkCopy(GetInsertList()); //批量插入 适合海量数据插入，要求实体与数据库一致，不支持(别名表、排除列等功能) //设置不插入列 db.DisableInsertColumns = new string[] { "sex" };//sex列将不会插入值 Student s = new Student() { name = "张" + new Random().Next(1, int.MaxValue), sex = "gril" }; var id = db.Insert(s); //