Refactoring database creation, adding sql syntax provider to account for differences in syntax between sql, ce and mysql.

Adding MySql unit test.

src/Umbraco.Core/Persistence/SqlSyntax/SqlServerSyntaxProvider.cs

@@ -0,0 +1,35 @@
+using Umbraco.Core.Persistence.SqlSyntax.ModelDefinitions;
+
+namespace Umbraco.Core.Persistence.SqlSyntax
+{
+    internal class SqlServerSyntaxProvider : SqlSyntaxProviderBase<SqlServerSyntaxProvider>
+    {
+        public static SqlServerSyntaxProvider Instance = new SqlServerSyntaxProvider();
+
+        private SqlServerSyntaxProvider()
+        {
+            StringLengthColumnDefinitionFormat = StringLengthUnicodeColumnDefinitionFormat;
+            StringColumnDefinition = string.Format(StringLengthColumnDefinitionFormat, DefaultStringLength);
+
+            AutoIncrementDefinition = "IDENTITY(1,1)";
+            StringColumnDefinition = "VARCHAR(8000)";
+            GuidColumnDefinition = "UniqueIdentifier";
+            RealColumnDefinition = "FLOAT";
+            BoolColumnDefinition = "BIT";
+            DecimalColumnDefinition = "DECIMAL(38,6)";
+            TimeColumnDefinition = "TIME"; //SQLSERVER 2008+
+            BlobColumnDefinition = "VARBINARY(MAX)";
+
+            InitColumnTypeMap();
+        }
+
+        public override bool DoesTableExist(Database db, string tableName)
+        {
+            var result =
+                db.ExecuteScalar<long>("SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = @TableName",
+                                       new { TableName = tableName });
+
+            return result > 0;
+        }
+    }
+}