diff --git a/VERSION b/VERSION
index bccc7262..2107ad3c 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-xorm v0.5.2.0303
+xorm v0.5.2.0304
diff --git a/session.go b/session.go
index 05c59569..10a8f81f 100644
--- a/session.go
+++ b/session.go
@@ -2204,12 +2204,12 @@ func (session *Session) innerInsertMulti(rowsSlicePtr interface{}) (int64, error
 					continue
 				}
 				if session.Statement.ColumnStr != "" {
-					if _, ok := session.Statement.columnMap[col.Name]; !ok {
+					if _, ok := session.Statement.columnMap[strings.ToLower(col.Name)]; !ok {
 						continue
 					}
 				}
 				if session.Statement.OmitStr != "" {
-					if _, ok := session.Statement.columnMap[col.Name]; ok {
+					if _, ok := session.Statement.columnMap[strings.ToLower(col.Name)]; ok {
 						continue
 					}
 				}
@@ -2252,12 +2252,12 @@ func (session *Session) innerInsertMulti(rowsSlicePtr interface{}) (int64, error
 					continue
 				}
 				if session.Statement.ColumnStr != "" {
-					if _, ok := session.Statement.columnMap[col.Name]; !ok {
+					if _, ok := session.Statement.columnMap[strings.ToLower(col.Name)]; !ok {
 						continue
 					}
 				}
 				if session.Statement.OmitStr != "" {
-					if _, ok := session.Statement.columnMap[col.Name]; ok {
+					if _, ok := session.Statement.columnMap[strings.ToLower(col.Name)]; ok {
 						continue
 					}
 				}
diff --git a/statement.go b/statement.go
index 982542d5..06b72739 100644
--- a/statement.go
+++ b/statement.go
@@ -867,7 +867,8 @@ func (statement *Statement) Cols(columns ...string) *Statement {
 	}
 	statement.ColumnStr = statement.Engine.Quote(strings.Join(newColumns, statement.Engine.Quote(", ")))
 	if strings.Contains(statement.ColumnStr, ".") {
-		statement.ColumnStr = strings.Replace(statement.ColumnStr, ".", statement.Engine.Quote("."), -1)
+		statement.ColumnStr = strings.Replace(statement.ColumnStr, ".",
+			statement.Engine.dialect.QuoteStr()+"."+statement.Engine.dialect.QuoteStr(), -1)
 	}
 	statement.ColumnStr = strings.Replace(statement.ColumnStr, statement.Engine.Quote("*"), "*", -1)
 	return statement
diff --git a/xorm.go b/xorm.go
index 1c543f07..d0a88ab2 100644
--- a/xorm.go
+++ b/xorm.go
@@ -17,7 +17,7 @@ import (
 )
 
 const (
-	Version string = "0.5.2.0303"
+	Version string = "0.5.2.0304"
 )
 
 func regDrvsNDialects() bool {