- 增加 linq to sql 的查询语法，以及单元测试；

FreeSql.Tests/LinqToSql/SqliteLinqToSqlTests.cs

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+using FreeSql.DataAnnotations;
+using System;
+using System.Linq;
+using Xunit;
+
+namespace FreeSql.Tests.LinqToSql {
+
+
+	class TestLinqToSql {
+		public Guid id { get; set; }
+
+		public string name { get; set; }
+
+		public int click { get; set; } = 10;
+
+		public DateTime createtime { get; set; } = DateTime.Now;
+	}
+	class TestLinqToSqlComment {
+		public Guid id { get; set; }
+
+		public Guid TestLinqToSqlId { get; set; }
+		public TestLinqToSql TEstLinqToSql { get; set; }
+
+		public string text { get; set; }
+		
+		public DateTime createtime { get; set; } = DateTime.Now;
+	}
+
+	public class SqliteLinqToSqlTests {
+
+		[Fact]
+		public void Where() {
+			var item = new TestLinqToSql { name = Guid.NewGuid().ToString() };
+			g.sqlite.Insert<TestLinqToSql>().AppendData(item).ExecuteAffrows();
+
+			var t1 = (from a in g.sqlite.Select<TestLinqToSql>()
+					  where a.id == item.id
+					  select a).ToList();
+			Assert.True(t1.Any());
+			Assert.Equal(item.id, t1[0].id);
+		}
+
+		[Fact]
+		public void Select() {
+			var item = new TestLinqToSql { name = Guid.NewGuid().ToString() };
+			g.sqlite.Insert<TestLinqToSql>().AppendData(item).ExecuteAffrows();
+
+			var t1 = (from a in g.sqlite.Select<TestLinqToSql>()
+					  where a.id == item.id
+					  select new { a.id }).ToList();
+			Assert.True(t1.Any());
+			Assert.Equal(item.id, t1[0].id);
+		}
+
+		[Fact]
+		public void GroupBy() {
+			var item = new TestLinqToSql { name = Guid.NewGuid().ToString() };
+			g.sqlite.Insert<TestLinqToSql>().AppendData(item).ExecuteAffrows();
+
+			var t1 = (from a in g.sqlite.Select<TestLinqToSql>()
+					 where a.id == item.id
+					 group a by new {a.id, a.name } into g
+					 select new {
+						 g.Key.id, g.Key.name,
+						 cou = g.Count(),
+						 avg = g.Avg(g.Value.click),
+						 sum = g.Sum(g.Value.click),
+						 max = g.Max(g.Value.click),
+						 min = g.Min(g.Value.click)
+					 }).ToList();
+			Assert.True(t1.Any());
+			Assert.Equal(item.id, t1.First().id);
+		}
+
+		[Fact]
+		public void CaseWhen() {
+			var item = new TestLinqToSql { name = Guid.NewGuid().ToString() };
+			g.sqlite.Insert<TestLinqToSql>().AppendData(item).ExecuteAffrows();
+
+			var t1 = (from a in g.sqlite.Select<TestLinqToSql>()
+					 where a.id == item.id
+					 select new {
+						 a.id,
+						 a.name,
+						 testsub = new {
+							time = a.click > 10 ? "<22><><EFBFBD><EFBFBD>" : "С<>ڻ<EFBFBD><DABB><EFBFBD><EFBFBD><EFBFBD>"
+						 }
+					 }).ToList();
+			Assert.True(t1.Any());
+			Assert.Equal(item.id, t1[0].id);
+			Assert.Equal("С<>ڻ<EFBFBD><DABB><EFBFBD><EFBFBD><EFBFBD>", t1[0].testsub.time);
+		}
+
+		[Fact]
+		public void Join() {
+			var item = new TestLinqToSql { name = Guid.NewGuid().ToString() };
+			g.sqlite.Insert<TestLinqToSql>().AppendData(item).ExecuteAffrows();
+			var comment = new TestLinqToSqlComment { TestLinqToSqlId = item.id, text = Guid.NewGuid().ToString() };
+			g.sqlite.Insert<TestLinqToSqlComment>().AppendData(comment).ExecuteAffrows();
+
+			var t1 = (from a in g.sqlite.Select<TestLinqToSql>()
+					 join b in g.sqlite.Select<TestLinqToSqlComment>() on a.id equals b.TestLinqToSqlId
+					 select a).ToList();
+			Assert.True(t1.Any());
+			//Assert.Equal(item.id, t1[0].id);
+
+			var t2 = (from a in g.sqlite.Select<TestLinqToSql>()
+					 join b in g.sqlite.Select<TestLinqToSqlComment>() on a.id equals b.TestLinqToSqlId
+					 select new { a.id, bid = b.id }).ToList();
+			Assert.True(t2.Any());
+			//Assert.Equal(item.id, t2[0].id);
+			//Assert.Equal(comment.id, t2[0].bid);
+
+			var t3 = (from a in g.sqlite.Select<TestLinqToSql>()
+					 join b in g.sqlite.Select<TestLinqToSqlComment>() on a.id equals b.TestLinqToSqlId
+					 where a.id == item.id
+					 select new { a.id, bid = b.id }).ToList();
+			Assert.True(t3.Any());
+			Assert.Equal(item.id, t3[0].id);
+			Assert.Equal(comment.id, t3[0].bid);
+		}
+
+		[Fact]
+		public void LeftJoin() {
+			var item = new TestLinqToSql { name = Guid.NewGuid().ToString() };
+			g.sqlite.Insert<TestLinqToSql>().AppendData(item).ExecuteAffrows();
+			var comment = new TestLinqToSqlComment { TestLinqToSqlId = item.id, text = Guid.NewGuid().ToString() };
+			g.sqlite.Insert<TestLinqToSqlComment>().AppendData(comment).ExecuteAffrows();
+
+			var t1 = (from a in g.sqlite.Select<TestLinqToSql>()
+					  join b in g.sqlite.Select<TestLinqToSqlComment>() on a.id equals b.TestLinqToSqlId into temp
+					  from tc in temp.DefaultIfEmpty()
+					  select a).ToList();
+			Assert.True(t1.Any());
+			//Assert.Equal(item.id, t1[0].id);
+
+			var t2 = (from a in g.sqlite.Select<TestLinqToSql>()
+					  join b in g.sqlite.Select<TestLinqToSqlComment>() on a.id equals b.TestLinqToSqlId into temp
+					  from tc in temp.DefaultIfEmpty()
+					  select new { a.id, bid = tc.id }).ToList();
+			Assert.True(t2.Any());
+			//Assert.Equal(item.id, t2[0].id);
+			//Assert.Equal(comment.id, t2[0].bid);
+
+			var t3 = (from a in g.sqlite.Select<TestLinqToSql>()
+					  join b in g.sqlite.Select<TestLinqToSqlComment>() on a.id equals b.TestLinqToSqlId into temp
+					  from tc in temp.DefaultIfEmpty()
+					  where a.id == item.id
+					  select new { a.id, bid = tc.id }).ToList();
+			Assert.True(t3.Any());
+			Assert.Equal(item.id, t3[0].id);
+			Assert.Equal(comment.id, t3[0].bid);
+		}
+
+		[Fact]
+		public void From() {
+			var item = new TestLinqToSql { name = Guid.NewGuid().ToString() };
+			g.sqlite.Insert<TestLinqToSql>().AppendData(item).ExecuteAffrows();
+			var comment = new TestLinqToSqlComment { TestLinqToSqlId = item.id, text = Guid.NewGuid().ToString() };
+			g.sqlite.Insert<TestLinqToSqlComment>().AppendData(comment).ExecuteAffrows();
+
+			var t1 = (from a in g.sqlite.Select<TestLinqToSql>()
+					  from b in g.sqlite.Select<TestLinqToSqlComment>()
+					  where a.id == b.TestLinqToSqlId
+					  select a).ToList();
+			Assert.True(t1.Any());
+			//Assert.Equal(item.id, t1[0].id);
+
+			var t2 = (from a in g.sqlite.Select<TestLinqToSql>()
+					  from b in g.sqlite.Select<TestLinqToSqlComment>()
+					  where a.id == b.TestLinqToSqlId
+					  select new { a.id, bid = b.id }).ToList();
+			Assert.True(t2.Any());
+			//Assert.Equal(item.id, t2[0].id);
+			//Assert.Equal(comment.id, t2[0].bid);
+
+			var t3 = (from a in g.sqlite.Select<TestLinqToSql>()
+					  from b in g.sqlite.Select<TestLinqToSqlComment>()
+					  where a.id == b.TestLinqToSqlId
+					  where a.id == item.id
+					  select new { a.id, bid = b.id }).ToList();
+			Assert.True(t3.Any());
+			Assert.Equal(item.id, t3[0].id);
+			Assert.Equal(comment.id, t3[0].bid);
+		}
+	}
+}