Fix SQL Server bool condition in JOIN

Author: mythz

src/ServiceStack.OrmLite/Expressions/SqlExpression.Join.cs

@@ -135,7 +135,13 @@ private SqlExpression<T> InternalJoin(string joinType,
             useFieldName = true;
             sep = " ";
 
+            if (!tableDefs.Contains(sourceDef))
+                tableDefs.Add(sourceDef);
+            if (!tableDefs.Contains(targetDef))
+                tableDefs.Add(targetDef);
+
             var isCrossJoin = "CROSS JOIN".Equals(joinType);
+
             var sqlExpr = joinExpr != null 
                 ? InternalCreateSqlFromExpression(joinExpr, isCrossJoin)
                 : InternalCreateSqlFromDefinitions(sourceDef, targetDef, isCrossJoin);
@@ -146,11 +152,6 @@ private SqlExpression<T> InternalJoin(string joinType,
 
             FromExpression += " {0} {1} {2}".Fmt(joinType, SqlTable(joinDef), sqlExpr);
 
-            if (!tableDefs.Contains(sourceDef))
-                tableDefs.Add(sourceDef);
-            if (!tableDefs.Contains(targetDef))
-                tableDefs.Add(targetDef);
-
             return this;
         }
 

tests/ServiceStack.OrmLite.Tests/ExpressionVisitorTests.cs

@@ -367,6 +367,19 @@ public class TestType
         public int Id { get; set; }
         public string TextCol { get; set; }
         public bool BoolCol { get; set; }
+        public bool? NullableBoolCol { get; set; }
+        public DateTime DateCol { get; set; }
+        public TestEnum EnumCol { get; set; }
+        public TestType ComplexObjCol { get; set; }
+        public int? NullableIntCol { get; set; }
+    }
+
+    public class TestType2
+    {
+        public int Id { get; set; }
+        public string TextCol { get; set; }
+        public bool BoolCol { get; set; }
+        public bool? NullableBoolCol { get; set; }
         public DateTime DateCol { get; set; }
         public TestEnum EnumCol { get; set; }
         public TestType ComplexObjCol { get; set; }

tests/ServiceStack.OrmLite.Tests/Issues/JoinBoolSqlServerIssue.cs

@@ -0,0 +1,80 @@
+using System.Diagnostics;
+using NUnit.Framework;
+using ServiceStack.DataAnnotations;
+using ServiceStack.Text;
+
+namespace ServiceStack.OrmLite.Tests.Issues
+{
+    public class JoinBoolSqlServerIssue : OrmLiteTestBase
+    {
+        [Test]
+        public void Can_Join_on_bool()
+        {
+            using (var db = OpenDbConnection())
+            {
+                db.DropAndCreateTable<TestType>();
+                db.DropAndCreateTable<TestType2>();
+
+                var q = db.From<TestType>()
+                    .LeftJoin<TestType2>((t1, t2) => t2.BoolCol == true && t1.Id == t2.Id);
+                var results = db.Select(q);
+
+                q = db.From<TestType>()
+                    .LeftJoin<TestType2>((t1, t2) => t2.NullableBoolCol == true && t1.Id == t2.Id);
+                results = db.Select(q);
+
+                results.PrintDump();
+            }
+        }
+
+        [Test]
+        public void Can_compare_bool_in_join_expression()
+        {
+            var db = OpenDbConnection();
+
+            db.DropTable<CardHolder>();
+            db.DropTable<Account>();
+
+            db.CreateTable<Account>();
+            db.CreateTable<CardHolder>();
+
+            var exp1 = db.From<Account>()
+                        .LeftJoin<CardHolder>((a, ch) => a.Id == ch.AccountId && ch.TestBoolB == true);
+
+            Debug.WriteLine(exp1.BodyExpression);
+            db.Select(exp1).PrintDump();
+
+            var exp2 = db.From<Account>()
+                        .LeftJoin<CardHolder>((a, ch) => a.Id == ch.AccountId && a.TestBoolA == true);
+
+            Debug.WriteLine(exp2.BodyExpression);
+            db.Select(exp2).PrintDump();
+
+
+            var exp3 = db.From<Account>()
+                            .Where(a => a.TestBoolA == true);
+            Debug.WriteLine(exp3.BodyExpression);
+            db.Select(exp3).PrintDump();
+        }
+    }
+
+    public class Account
+    {
+        [PrimaryKey]
+        public int Id { get; set; }
+
+        public bool TestBoolA { get; set; }
+    }
+
+    public class CardHolder
+    {
+        [PrimaryKey]
+        public int Id { get; set; }
+
+        [References(typeof(Account))]
+        public int AccountId { get; set; }
+
+        public bool TestBoolB { get; set; }
+    }
+
+}

tests/ServiceStack.OrmLite.Tests/ServiceStack.OrmLite.Tests.csproj

@@ -129,6 +129,7 @@
     <Compile Include="DateTimeTests.cs" />
     <Compile Include="DefaultValueTests.cs" />
     <Compile Include="Issues\BelongsToIssue.cs" />
+    <Compile Include="Issues\JoinBoolSqlServerIssue.cs" />
     <Compile Include="Issues\MergingNestedSqlExpressionIssue.cs" />
     <Compile Include="Legacy\ApiSqliteLegacyTests.cs" />
     <Compile Include="Legacy\ApiSqlServerLegacyTests.cs" />