//普通连接using (ISqlSugarClient idb = DbRepository.GetInstance(DbType.MySql, SugarDao.MySqlConnString))//DbRepository 框架现成的类，并非自定义

{ 
  var list = idb.Queryable<Student>().First(); 
}

//使用MyRepository连接数据库using (MyRepository db = new MyRepository()){      //当前连接的sqlconn1      var list = db.Database.Queryable<Student>().First();      //切换mysqlconn1      db.SetCurrent(db.MySqlConn1);      var list2 = db.Database.Queryable<Student>().First(); ;}

using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using SqlSugarRepository;namespace NewTest.Demos{    public class MyRepository:DbRepository    {        public ConnectionConfig SqlConn1 = new ConnectionConfig() { DbType = DbType.SqlServer, ConnectionString = SugarDao.SqlConnString1 };        public ConnectionConfig SqlConn2 = new ConnectionConfig() { DbType = DbType.SqlServer, ConnectionString = SugarDao.SqlConnString2 };        public ConnectionConfig MySqlConn1 = new ConnectionConfig() { DbType = DbType.MySql, ConnectionString = SugarDao.MySqlConnString };    }}

 var student12 = db.Queryable<Student>().Where(c => c.name).Where("id>@id", new { id = 1 }).ToList();

db.SqlQuery<Student>("select * from Student where id=@id",new SqlParameter("@id","id"));

string sql = db.SqlBuilder().ToSqlServer("select top 1 id,name from student ") .ToOracle("select id,name from student where rownum=1") .ToOther("select id,name from student limit 0,1").ToString(); var list = db.SqlQuery<string[]>(sql).SingleOrDefault();

var student = db.Queryable<Student>().ToList();var studentDynamic = db.Queryable<Student>().ToDynamic();var studentJson = db.Queryable<Student>().ToJson();var studentTable = db.Queryable<Student>().ToDataTable();

var student = db.Queryable<Student>().Select<int>(it=>it.id).ToList();var student2 = db.Queryable<Student>().Select<string[]>("*").ToList();var student3 = db.Queryable<Student>().Select<Dictionary<string,object>>("id,name").ToList();

var list1 = db.Queryable<Student>().Where(c => c.id < 10)        .Select<V_Student>(c => new V_Student { id = c.id, AreaName = "默认地区" }).ToList();

var list2 = db.Queryable<Student>().Where(c => c.id < 10)    .Select<V_Student>(c => new V_Student { id = c.id, AreaName = "默认地区" }).ToDynamic();

int pageCount = 0;                var page = db.Queryable<Student>().Where(c => c.id > 1).OrderBy(it => it.id).ToPageList(pageIndex,pageSize,ref pageCount);

//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);//查询单条根据主键var singleByPk = db.Queryable<Student>().InSingle(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();//查询所有的Idvar singleFieldList = db.Queryable<Student>().Select<int>(it=>it.id).ToList();//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*pageSizevar 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();//Likeconval = "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(            db.Sqlbuilder()            .ToOracle("id>100 and id in( select 1 from dual)")            .ToOther( "id>100 and id in( select 1)").ToString()    ).ToList();//存在记录反回true，则否返回falsebool isAny100 = db.Queryable<Student>().Any(c => c.id == 100);bool isAny1 = db.Queryable<Student>().Any(c => c.id == 1);//获取最大Idobject 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//Invar intArray = new[] { "5", "2", "3" };var intList = intArray.ToList();var listnew = db.Queryable<Student>().Where(it => intArray.Contains(it.name)).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();var list6 = db.Queryable<Student>().In(intList).ToList();//不设置字段默认主键//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 =SqlSugarTool.PackagingSQL(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 = queryable.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 =DbRepository.GetISugarQueryableByType<Student>(type).Where(it => it.id == 1);//声名没有connection对象的Queryabledb.SetDB(par);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();//拉姆达支持的函数操作var par1 = "2015-1-1"; var par2 = "   我 有空格A, ";var r1 = db.Queryable<Student>().Where(it => it.name == par1.ObjToString()).ToList(); //ObjToString会将null转转成""var r2 = db.Queryable<InsertTest>().Where(it => it.d1 == par1.ObjToDate()).ToList();var r3 = db.Queryable<InsertTest>().Where(it => it.id == 1.ObjToInt()).ToList();//ObjToInt会将null转转成0var r4 = db.Queryable<InsertTest>().Where(it => it.id == 2.ObjToDecimal()).ToList();var r5 = db.Queryable<InsertTest>().Where(it => it.id == 3.ObjToMoney()).ToList();var r6 = db.Queryable<InsertTest>().Where(it => it.v1 == par2.Trim()).ToList();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 => c.name == par2.ToLower()).ToList();var convert4 = db.Queryable<Student>().Where(c => c.name == par2.ToUpper()).ToList();var convert5= 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();var c5 = db.Queryable<Student>().Where(c => c.name.Equals("小杰")).ToList();var c6 = db.Queryable<Student>().Where(c => c.name.Length > 4).ToList();var time = db.Queryable<InsertTest>().Where(c => c.d1>DateTime.Now.AddDays(1)).ToList();var time2 = db.Queryable<InsertTest>().Where(c => c.d1 > DateTime.Now.AddYears(1)).ToList();var time3 = db.Queryable<InsertTest>().Where(c => c.d1 > DateTime.Now.AddMonths(1)).ToList();

插入单条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)插入多条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); //插入//查询刚插入的sex是否有值var sex = db.Queryable<Student>().Single(it => it.id == id.ObjToInt()).sex;//无值var name = db.Queryable<Student>().Single(it => it.id == id.ObjToInt()).name;//有值//SqlBulkCopy同样支持不插入列设置db.SqlBulkCopy(GetInsertList());

//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);var array=new int[]{1,2,3};db.Update<School>(new { name = "蓝翔2" }, it => array.Contains(it.id));// id in 1,2,3//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());//更新字符串db.Update<Student>("sch_id=sch_id+1", it => it.id == 1);//清空禁止更新列db.DisableUpdateColumns = null;//新语法添加禁止更新列db.AddDisableUpdateColumns("id", "name");//添加禁止更新列

//删除根据主键db.Delete<School, int>(10);//删除根据表达示db.Delete<School>(it => it.id > 100);//支持it=>array.contains(it.id) //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 });//根据实体赋值实体一定要有主键，并且要有值。db.Delete(new School() { id = 200 });//根据字符串删除db.Delete<School>("id=@id", new { id = 100 });//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);

//插入或者更新 NEW//当主键值为 0 、sttring.Empty、NULL 或者 Guid.Empty时执行插操作，否则执行更新db.AddDisableInsertColumns("UpdateTime");//禁止插入更新时间db.AddDisableUpdateColumns("CreateTime");//禁止更新创建时间db.InsertOrUpdate(GetInsertItem2());