From 22c515f1e0d7314d9255951074ee753ab2984767 Mon Sep 17 00:00:00 2001
From: Lunny Xiao <xiaolunwen@gmail.com>
Date: Fri, 11 Apr 2014 15:38:09 +0800
Subject: [PATCH] fixed

---
 column.go  |  3 ++-
 dialect.go | 11 +++++++++++
 table.go   |  1 +
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/column.go b/column.go
index 8bea883e..4e179a14 100644
--- a/column.go
+++ b/column.go
@@ -30,11 +30,12 @@ type Column struct {
 	IsCascade       bool
 	IsVersion       bool
 	fieldPath       []string
+	DefaultIsEmpty  bool
 }
 
 func NewColumn(name, fieldName string, sqlType SQLType, len1, len2 int, nullable bool) *Column {
 	return &Column{name, fieldName, sqlType, len1, len2, nullable, "", make(map[string]bool), false, false,
-		TWOSIDES, false, false, false, false, nil}
+		TWOSIDES, false, false, false, false, nil, false}
 }
 
 // generate column description string according dialect
diff --git a/dialect.go b/dialect.go
index ecba0844..00fba638 100644
--- a/dialect.go
+++ b/dialect.go
@@ -1,6 +1,7 @@
 package core
 
 import (
+	"fmt"
 	"strings"
 	"time"
 )
@@ -29,6 +30,8 @@ type Dialect interface {
 	SqlType(t *Column) string
 	SupportInsertMany() bool
 	QuoteStr() string
+	RollBackStr() string
+	DropTableSql(tableName string) string
 	AutoIncrStr() string
 	SupportEngine() bool
 	SupportCharset() bool
@@ -83,6 +86,14 @@ func (b *Base) Quote(c string) string {
 	return b.dialect.QuoteStr() + c + b.dialect.QuoteStr()
 }
 
+func (db *Base) RollBackStr() string {
+	return "ROLL BACK"
+}
+
+func (db *Base) DropTableSql(tableName string) string {
+	return fmt.Sprintf("DROP TABLE IF EXISTS `%s`", tableName)
+}
+
 func (b *Base) CreateTableSql(table *Table, tableName, storeEngine, charset string) string {
 	var sql string
 	sql = "CREATE TABLE IF NOT EXISTS "
diff --git a/table.go b/table.go
index 554d5a5c..aadcc9a8 100644
--- a/table.go
+++ b/table.go
@@ -17,6 +17,7 @@ type Table struct {
 	Created       map[string]bool
 	Updated       string
 	Version       string
+	Cacher        Cacher
 }
 
 func (table *Table) Columns() map[string]*Column {