/// <summary>
/// 单表查询
/// </summary>
private void QueryableDemo()
{
using (var db = SugarDao.GetInstance())
{
//---------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 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10-20条
var page1 = db.Queryable <Student>().Where(c => c.id > 10).OrderBy("id").Skip(10).Take(20).ToList();
//上一句的简化写法，同样取10-20条
var page2 = db.Queryable <Student>().Where(c => c.id > 10).OrderBy("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("id").Skip(2).ToList();
//取前2条
var take = db.Queryable <Student>().Where(c => c.id > 10).OrderBy("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();
// 可以在拉姆达使用 ToString和 Convert,比EF出色的地方
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 convert4 = db.Queryable <Student>().Where(c => DateTime.Now > DateTime.Now).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>100").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);
int maxId = db.Queryable <Student>().Max <Student, int>("id");
int minId = db.Queryable <Student>().Where(c => c.id > 0).Min <Student, int>("id");
//In
var list1 = db.Queryable <Student>().In("id", "1", "2", "3").ToList();
var list2 = db.Queryable <Student>().In("id", new string[] { "1", "2", "3" }).ToList();
var list3 = db.Queryable <Student>().In("id", new List <string> {
"1", "2", "3"
}).ToList();
var list4 = db.Queryable <Student>().Where(it => it.id < 10).In("id", new List <string> {
"1", "2", "3"
}).ToList();
//分组查询
var list5 = db.Queryable <Student>().Where(c => c.id < 20).GroupBy("sex").Select <Student, SexTotal>("Sex,Count=count(*)").ToList();
//SELECT Sex,Count=count(*) FROM Student WHERE 1=1 AND (id < 20) GROUP BY Sex --生成结果
}
}
/// <summary>
/// 多表查询
/// </summary>
private void SqlableDemo()
{
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
.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);
}
}
/// <summary>
/// 单表查询
/// </summary>
private void QueryableDemo()
{
using (var db = SugarDao.GetInstance())
{
//---------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 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10-20条
var page1 = db.Queryable <Student>().Where(c => c.id > 10).OrderBy(it => it.id).Skip(10).Take(20).ToList();
//上一句的简化写法，同样取10-20条
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();
// 可以在拉姆达使用 ToString和 Convert,比EF出色的地方
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 convert4 = db.Queryable <Student>().Where(c => DateTime.Now > DateTime.Now).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>100").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 <Student, 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 <Student, 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 <SexTotal> list9 = db.Queryable <Student>().Where(c => c.id < 20).GroupBy(it => it.sex).Select <Student, SexTotal>("Sex,Count=count(*)").ToList();
List <SexTotal> list10 = db.Queryable <Student>().Where(c => c.id < 20).GroupBy("sex").Select <Student, SexTotal>("Sex,Count=count(*)").ToList();
//SELECT Sex,Count=count(*) FROM Student WHERE 1=1 AND (id < 20) GROUP BY Sex --生成结果
}
}
