diff --git a/engine.go b/engine.go
index 96071a36..4103738e 100644
--- a/engine.go
+++ b/engine.go
@@ -933,7 +933,7 @@ func (engine *Engine) mapType(v reflect.Value) *core.Table {
 
 		table.AddColumn(col)
 
-		if fieldType.Kind() == reflect.Int64 && (col.FieldName == "Id" || strings.HasSuffix(col.FieldName, ".Id")) {
+		if fieldType.Kind() == reflect.Int64 && (strings.ToUpper(col.FieldName) == "ID" || strings.HasSuffix(strings.ToUpper(col.FieldName), ".ID")) {
 			idFieldColName = col.Name
 		}
 	} // end for
@@ -1404,6 +1404,9 @@ func (engine *Engine) NowTime2(sqlTypeName string) (interface{}, time.Time) {
 }
 
 func (engine *Engine) FormatTime(sqlTypeName string, t time.Time) (v interface{}) {
+	if engine.dialect.DBType() == core.ORACLE {
+		return t
+	}
 	switch sqlTypeName {
 	case core.Time:
 		s := engine.TZTime(t).Format("2006-01-02 15:04:05") //time.RFC3339
diff --git a/helpers.go b/helpers.go
index a0e894e0..7eaa1dd1 100644
--- a/helpers.go
+++ b/helpers.go
@@ -282,7 +282,10 @@ func query2(db *core.DB, sqlStr string, params ...interface{}) (resultsSlice []m
 }
 
 func setColumnTime(bean interface{}, col *core.Column, t time.Time) {
-	v, _ := col.ValueOf(bean)
+	v, err := col.ValueOf(bean)
+	if err != nil {
+		return
+	}
 	if v.CanSet() {
 		switch v.Type().Kind() {
 		case reflect.Struct:
diff --git a/session.go b/session.go
index c0c4d4dc..41afe844 100644
--- a/session.go
+++ b/session.go
@@ -448,6 +448,13 @@ func (session *Session) exec(sqlStr string, args ...interface{}) (sql.Result, er
 
 	return session.Engine.LogSQLExecutionTime(sqlStr, args, func() (sql.Result, error) {
 		if session.IsAutoCommit {
+			//oci8 can not auto commit (github.com/mattn/go-oci8)
+			if session.Engine.dialect.DBType() == core.ORACLE {
+				session.Begin()
+				r, err := session.Tx.Exec(sqlStr, args...)
+				session.Commit()
+				return r, err
+			}
 			return session.innerExec(sqlStr, args...)
 		}
 		return session.Tx.Exec(sqlStr, args...)
@@ -3369,7 +3376,7 @@ func (session *Session) Update(bean interface{}, condiBean ...interface{}) (int6
 		if session.Statement.ColumnStr == "" {
 			colNames, args = buildUpdates(session.Engine, table, bean, false, false,
 				false, false, session.Statement.allUseBool, session.Statement.useAllCols,
-				session.Statement.mustColumnMap, true)
+				session.Statement.mustColumnMap, session.Statement.columnMap, true)
 		} else {
 			colNames, args, err = genCols(table, session, bean, true, true)
 			if err != nil {
@@ -3472,6 +3479,10 @@ func (session *Session) Update(bean interface{}, condiBean ...interface{}) (int6
 			}
 		}
 
+		if st.LimitN > 0 {
+			condition = condition + fmt.Sprintf(" LIMIT %d", st.LimitN)
+		}
+
 		sqlStr = fmt.Sprintf("UPDATE %v SET %v, %v %v",
 			session.Engine.Quote(session.Statement.TableName()),
 			strings.Join(colNames, ", "),
@@ -3498,6 +3509,10 @@ func (session *Session) Update(bean interface{}, condiBean ...interface{}) (int6
 			}
 		}
 
+		if st.LimitN > 0 {
+			condition = condition + fmt.Sprintf(" LIMIT %d", st.LimitN)
+		}
+
 		sqlStr = fmt.Sprintf("UPDATE %v SET %v %v",
 			session.Engine.Quote(session.Statement.TableName()),
 			strings.Join(colNames, ", "),
diff --git a/statement.go b/statement.go
index 18137440..998d8d68 100644
--- a/statement.go
+++ b/statement.go
@@ -286,7 +286,7 @@ func (statement *Statement) Table(tableNameOrBean interface{}) *Statement {
 func buildUpdates(engine *Engine, table *core.Table, bean interface{},
 	includeVersion bool, includeUpdated bool, includeNil bool,
 	includeAutoIncr bool, allUseBool bool, useAllCols bool,
-	mustColumnMap map[string]bool, update bool) ([]string, []interface{}) {
+	mustColumnMap map[string]bool, columnMap map[string]bool, update bool) ([]string, []interface{}) {
 
 	colNames := make([]string, 0)
 	var args = make([]interface{}, 0)
@@ -306,6 +306,9 @@ func buildUpdates(engine *Engine, table *core.Table, bean interface{},
 		if col.IsDeleted {
 			continue
 		}
+		if use, ok := columnMap[col.Name]; ok && !use {
+			continue
+		}
 
 		if engine.dialect.DBType() == core.MSSQL && col.SQLType.Name == core.Text {
 			continue
@@ -418,13 +421,16 @@ func buildUpdates(engine *Engine, table *core.Table, bean interface{},
 				if table, ok := engine.Tables[fieldValue.Type()]; ok {
 					if len(table.PrimaryKeys) == 1 {
 						pkField := reflect.Indirect(fieldValue).FieldByName(table.PKColumns()[0].FieldName)
-						if pkField.Int() != 0 {
+						// fix non-int pk issues
+						//if pkField.Int() != 0 {
+						if pkField.IsValid() && !isZero(pkField.Interface()) {
 							val = pkField.Interface()
 						} else {
 							continue
 						}
 					} else {
 						//TODO: how to handler?
+						panic("not supported")
 					}
 				} else {
 					val = fieldValue.Interface()
@@ -596,13 +602,16 @@ func buildConditions(engine *Engine, table *core.Table, bean interface{},
 				if table, ok := engine.Tables[fieldValue.Type()]; ok {
 					if len(table.PrimaryKeys) == 1 {
 						pkField := reflect.Indirect(fieldValue).FieldByName(table.PKColumns()[0].FieldName)
-						if pkField.Int() != 0 {
+						// fix non-int pk issues
+						//if pkField.Int() != 0 {
+						if pkField.IsValid() && !isZero(pkField.Interface()) {
 							val = pkField.Interface()
 						} else {
 							continue
 						}
 					} else {
 						//TODO: how to handler?
+						panic("not supported")
 					}
 				} else {
 					val = fieldValue.Interface()
@@ -1219,7 +1228,11 @@ func (statement *Statement) genSelectSql(columnStr string) (a string) {
 	}
 	var fromStr string = " FROM " + statement.Engine.Quote(statement.TableName())
 	if statement.TableAlias != "" {
-		fromStr += " AS " + statement.Engine.Quote(statement.TableAlias)
+		if statement.Engine.dialect.DBType() == core.ORACLE {
+			fromStr += " " + statement.Engine.Quote(statement.TableAlias)
+		} else {
+			fromStr += " AS " + statement.Engine.Quote(statement.TableAlias)
+		}
 	}
 	if statement.JoinStr != "" {
 		fromStr = fmt.Sprintf("%v %v", fromStr, statement.JoinStr)
@@ -1275,12 +1288,16 @@ func (statement *Statement) genSelectSql(columnStr string) (a string) {
 	if statement.OrderStr != "" {
 		a = fmt.Sprintf("%v ORDER BY %v", a, statement.OrderStr)
 	}
-	if statement.Engine.dialect.DBType() != core.MSSQL {
+	if statement.Engine.dialect.DBType() != core.MSSQL && statement.Engine.dialect.DBType() != core.ORACLE {
 		if statement.Start > 0 {
 			a = fmt.Sprintf("%v LIMIT %v OFFSET %v", a, statement.LimitN, statement.Start)
 		} else if statement.LimitN > 0 {
 			a = fmt.Sprintf("%v LIMIT %v", a, statement.LimitN)
 		}
+	} else if statement.Engine.dialect.DBType() == core.ORACLE {
+		if statement.Start != 0 || statement.LimitN != 0 {
+			a = fmt.Sprintf("SELECT %v FROM (SELECT %v,ROWNUM RN FROM (%v) at WHERE ROWNUM <= %d) aat WHERE RN > %d", columnStr, columnStr, a, statement.Start+statement.LimitN, statement.Start)
+		}
 	}
 
 	return