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         世界上最简单的ORM，只需要配置连接字符串，F5运行控制台自动建库建表运行DEMO

         Support：MySql、SqlServer、Sqlite、Oracle 、 postgresql 、达梦、人大金仓 

public List<Student> GetStudentList()
{
    var db = GetInstance();
    var list = db.Queryable<Student>().ToList();//Search
    return list;
}

/// <summary>
/// Create SqlSugarClient
/// </summary>
/// <returns></returns>
private SqlSugarClient GetInstance()
{
    SqlSugarClient db = new SqlSugarClient(new ConnectionConfig()
    {
        ConnectionString = "Server=.xxxxx",
        DbType = DbType.SqlServer,
        IsAutoCloseConnection = true,
        InitKeyType = InitKeyType.Attribute
    });
    //Print sql
    db.Aop.OnLogExecuting = (sql, pars) =>
    {
        Console.WriteLine(sql + "\r\n" + db.Utilities.SerializeObject(pars.ToDictionary(it => it.ParameterName, it => it.Value)));
        Console.WriteLine();
    };
    return db;
}

public class Student
{
    [SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
    public int Id { get; set; }
    public int? SchoolId { get; set; }
    public string Name { get; set; }
}

//easy
var getAll = db.Queryable<Student>().ToList();
var getAllNoLock = db.Queryable<Student>().With(SqlWith.NoLock).ToList();
var getByPrimaryKey = db.Queryable<Student>().InSingle(2);
var sum = db.Queryable<Student>().Sum(it => it.Id);
var isAny = db.Queryable<Student>().Where(it => it.Id == -1).Any();
var isAny2 = db.Queryable<Student>().Any(it => it.Id == -1);
var getListByRename = db.Queryable<School>().AS("Student").ToList();
var getByWhere = db.Queryable<Student>().Where(it => it.Id == 1 || it.Name == "a").ToList();
var getByFuns = db.Queryable<Student>().Where(it => SqlFunc.IsNullOrEmpty(it.Name)).ToList();
var group = db.Queryable<Student>().GroupBy(it => it.Id).Select(it => new { id = SqlFunc.AggregateCount(it.Id) }).ToList();

//Page
var page = db.Queryable<Student>().ToPageList(pageIndex, pageSize, ref totalCount);

//page join
var pageJoin = db.Queryable<Student, School>((st, sc) => new JoinQueryInfos(JoinType.Left, st.SchoolId == sc.Id))
.ToPageList(pageIndex, pageSize, ref totalCount);

//top 5
var top5 = db.Queryable<Student>().Take(5).ToList();

//join Order By (order by st.id desc,sc.id desc)
var list4 = db.Queryable<Student, School>((st, sc) => new JoinQueryInfos(JoinType.Left, st.SchoolId == sc.Id))
.OrderBy(st => st.Id, OrderByType.Desc)
.OrderBy((st, sc) => sc.Id, OrderByType.Desc)
.Select<ViewModelStudent>().ToList();

//update reutrn Update Count
var t1= db.Updateable(updateObj).ExecuteCommand();

//Only  update  Name 
var t3 = db.Updateable(updateObj).UpdateColumns(it => new { it.Name }).ExecuteCommand();

//Ignore  Name and TestId
var t4 = db.Updateable(updateObj).IgnoreColumns(it => new { it.Name, it.TestId }).ExecuteCommand();

//update List<T>
var t7 = db.Updateable(updateObjs).ExecuteCommand();

//Where By Expression
var t9 = db.Updateable(it => new class() { name = "a",createtime = p }).Where(it => it.Id == 1).ExecuteCommand();

//Insert reutrn Insert Count
var t2 = db.Insertable(insertObj).ExecuteCommand();

//Insert reutrn Identity Value
var t3 = db.Insertable(insertObj).ExecuteReutrnIdentity();

//Only  insert  Name 
var t4 = db.Insertable(insertObj).InsertColumns(it => new { it.Name, it.SchoolId }).ExecuteReutrnIdentity();

//Ignore TestId
var t5 = db.Insertable(insertObj).IgnoreColumns(it => new { it.Name, it.TestId }).ExecuteReutrnIdentity();

//Insert List<T>
var s9 = db.Insertable(insertObjs).InsertColumns(it => new { it.Name }).ExecuteCommand();

//by entity
db.Deleteable<Student>().Where(new Student() { Id = 1 }).ExecuteCommand();

//by primary key
db.Deleteable<Student>().In(1).ExecuteCommand();

//by primary key array
db.Deleteable<Student>().In(new int[] { 1, 2 }).ExecuteCommand();

//by expression
db.Deleteable<Student>().Where(it => it.Id == 1).ExecuteCommand();

var list = db.SqlQueryable<Student>("select * from student").ToPageList(1, 2);
var list2 = db.SqlQueryable<Student>("select * from student").Where(it => it.Id == 1).ToPageList(1, 2);
var list3 = db.SqlQueryable<Student>("select * from student").Where("id=@id", new { id = 1 }).ToPageList(1, 2);

var db = GetInstance();
db.Insertable<Student>(new Student() { Name = "a" }).AddQueue();
db.Insertable<Student>(new Student() { Name = "b" }).AddQueue();
db.SaveQueues();

db.Insertable<Student>(new Student() { Name = "a" }).AddQueue();
db.Insertable<Student>(new Student() { Name = "b" }).AddQueue();
db.Insertable<Student>(new Student() { Name = "c" }).AddQueue();
db.Insertable<Student>(new Student() { Name = "d" }).AddQueue();
var ar = db.SaveQueuesAsync();

db.Queryable<Student>().AddQueue();
db.Queryable<School>().AddQueue();
db.AddQueue("select * from student where id=@id", new { id = 1 });
var result2 = db.SaveQueues<Student, School, Student>();  

var dt=db.Ado.GetDataTable("select * from table where id=@id and name=@name",new List<SugarParameter>(){
  new SugarParameter("@id",1),
  new SugarParameter("@name",2)
});
var dt = db.Ado.GetDataTable("select * from table where id=@id and name=@name", new { id = 1, name = 2 });

//Use Stored Procedure
var dt2 = db.Ado.UseStoredProcedure().GetDataTable("sp_school", new { name = "张三", age = 0 });//  GetInt SqlQuery<T>  等等都可以用
var nameP = new SugarParameter("@name", "张三");
var ageP = new SugarParameter("@age", null, true);//isOutput=true
var dt2 = db.Ado.UseStoredProcedure().GetDataTable("sp_school", nameP, ageP);

db.Saveable<Student>(entity).ExecuteReturnEntity();
db.Saveable<Student>(new Student() { Name = "" })
                  .InsertColumns(it => it.Name)
                  .UpdateColumns(it => new { it.Name, it.CreateTime }
                  .ExecuteReturnEntity();

var entityInfo=db.EntityMaintenance.GetEntityInfo<Student>();
foreach (var column in entityInfo.Columns)
{
  Console.WriteLine(column.ColumnDescription);
}

var tables = db.DbMaintenance.GetTableInfoList();
foreach (var table in tables)
{
 Console.WriteLine(table.Description);
}

db.Aop.OnLogExecuted = (sql, pars) => //SQL executed event
{

};
db.Aop.OnLogExecuting = (sql, pars) => //SQL executing event (pre-execution)
{

};
db.Aop.OnError = (exp) =>//SQL execution error event
{

};
db.Aop.OnExecutingChangeSql = (sql, pars) => //SQL executing event (pre-execution,SQL script can be modified)
{
  return new KeyValuePair<string, SugarParameter[]>(sql, pars);
};

//gobal filter
var db = GetInstance();
var sql = db.Queryable<Student>().ToSql();
//SELECT [ID],[SchoolId],[Name],[CreateTime] FROM [STudent]  WHERE  isDelete=0 


public static SqlSugarClient GetInstance()
{
  SqlSugarClient db = new SqlSugarClient(new ConnectionConfig() { xxx);
  db.QueryFilter.Add(new SqlFilterItem()
  {
      FilterValue = filterDb =>
      {
          return new SqlFilterResult() { Sql = " isDelete=0" };
      }
  });
  return db;
}

var db = GetInstance();
//Create all class
db.DbFirst.CreateClassFile("c:\\Demo\\1");

//Create student calsss
db.DbFirst.Where("Student").CreateClassFile("c:\\Demo\\2");
//Where(array)

//Mapping name
db.MappingTables.Add("ClassStudent", "Student");
db.MappingColumns.Add("NewId", "Id", "ClassStudent");
db.DbFirst.Where("Student").CreateClassFile("c:\\Demo\\3");

//Remove mapping
db.MappingTables.Clear();

//Create class with default value
db.DbFirst.IsCreateDefaultValue().CreateClassFile("c:\\Demo\\4", "Demo.Models");


//Mapping and Attribute
db.MappingTables.Add("ClassStudent", "Student");
db.MappingColumns.Add("NewId", "Id", "ClassStudent");
db.DbFirst.IsCreateAttribute().Where("Student").CreateClassFile("c:\\Demo\\5");

db.CodeFirst.SetStringDefaultLength(100).BackupTable().InitTables(typeof(CodeTable), typeof(CodeTable2)); //change entity backupTable
db.CodeFirst.SetStringDefaultLength(100).InitTables(typeof(CodeTable), typeof(CodeTable2));

var list = db.Utilities.DataTableToList(datatable);

var db = GetInstance();
var sdb = db.GetSimpleClient<Student>();
sdb.GetById(1);
sdb.GetList();
sdb.DeleteById(1);
sdb.Update(obj);