Add support for using string params larger than default string length

Author: mythz

src/ServiceStack.OrmLite.SqlServerTests/Issues/StringLengthParamTests.cs

@@ -0,0 +1,44 @@
+using NUnit.Framework;
+using ServiceStack.DataAnnotations;
+
+namespace ServiceStack.OrmLite.SqlServerTests.Issues
+{
+    class StringLengthParamTest
+    {
+        [AutoIncrement]
+        public int Id { get; set; }
+
+        //[CustomField("VARCHAR(MAX)")]
+        [StringLength(StringLengthAttribute.MaxText)]
+        public string Name { get; set; }
+    }
+
+    public class StringLengthParamTests
+        : OrmLiteTestBase
+    {
+        [Test]
+        public void Can_select_param_greater_than_default_length()
+        {
+            var hold = OrmLiteConfig.DialectProvider.GetStringConverter().UseUnicode;
+            OrmLiteConfig.DialectProvider.GetStringConverter().UseUnicode = false;
+
+            using (var db = OpenDbConnection())
+            {
+                db.DropAndCreateTable<StringLengthParamTest>();
+
+                var name = "a" + new string('b', 8000) + "c";
+
+                db.Insert(new StringLengthParamTest
+                {
+                    Name = name
+                });
+
+                var people = db.Select<StringLengthParamTest>(p => p.Name == name);
+
+                Assert.That(people.Count, Is.EqualTo(1));
+            }
+
+            OrmLiteConfig.DialectProvider.GetStringConverter().UseUnicode = hold;
+        }
+    }
+}

src/ServiceStack.OrmLite/Expressions/SqlExpression.cs

@@ -2337,7 +2337,12 @@ public IDbDataParameter CreateParam(string name,
             p.SourceVersion = sourceVersion;
 
             if (p.DbType == DbType.String)
+            {
                 p.Size = DialectProvider.GetStringConverter().StringLength;
+                string strValue = value as string;
+                if (strValue != null && strValue.Length > p.Size)
+                    p.Size = strValue.Length;
+            }
 
             if (value != null)
             {