better type habndling, shell-tableReader for preserving table structure

packages/engines/mssql/sql/columns.js

@@ -1,6 +1,7 @@
 module.exports = `
 select c.name as columnName, t.name as dataType, c.object_id as objectId, c.is_identity as isIdentity,
 	c.max_length as maxLength, c.precision, c.scale, c.is_nullable as isNullable,
+	col.CHARACTER_MAXIMUM_LENGTH as charMaxLength,
 	d.definition as defaultValue, d.name as defaultConstraint,
 	m.definition as computedExpression, m.is_persisted as isPersisted, c.column_id as columnId, 
 	-- TODO only if version >= 2008
@@ -8,8 +9,10 @@ select c.name as columnName, t.name as dataType, c.object_id as objectId, c.is_i
 from sys.columns c
 inner join sys.types t on c.system_type_id = t.system_type_id and c.user_type_id = t.user_type_id
 inner join sys.objects o on c.object_id = o.object_id
+INNER JOIN sys.schemas u ON u.schema_id=o.schema_id 
+INNER JOIN INFORMATION_SCHEMA.COLUMNS col ON col.TABLE_NAME = o.name AND col.TABLE_SCHEMA = u.name and col.COLUMN_NAME = c.name
 left join sys.default_constraints d on c.default_object_id = d.object_id
 left join sys.computed_columns m on m.object_id = c.object_id and m.column_id = c.column_id
 where o.type = 'U' and o.object_id =[OBJECT_ID_CONDITION]
 order by c.column_id
-`;
+`;

packages/engines/mssql/sql/viewColumns.js

@@ -6,7 +6,7 @@ select
 	col.COLUMN_NAME as columnName,
 	col.IS_NULLABLE as isNullable,
 	col.DATA_TYPE as dataType,
-	col.CHARACTER_MAXIMUM_LENGTH,
+	col.CHARACTER_MAXIMUM_LENGTH as charMaxLength,
 	col.NUMERIC_PRECISION as precision,
 	col.NUMERIC_SCALE as scale,
 	col.COLUMN_DEFAULT