Method In provides a update string

engine.go

@@ -342,6 +342,11 @@ func (engine *Engine) In(column string, args ...interface{}) *Session {
 	session := engine.NewSession()
 	session.IsAutoClose = true
 	return session.In(column, args...)
+// Method In provides a update string like "column = column + ?"
+func (engine *Engine) Inc(column string, arg interface{}) *Session {
+	session := engine.NewSession()
+	session.IsAutoClose = true
+	return session.Inc(column, arg)
 }
 
 // Temporarily change the Get, Find, Update's table

session.go

@@ -128,6 +128,12 @@ func (session *Session) In(column string, args ...interface{}) *Session {
 	return session
 }
 
+// Method In provides a query string like "count = count + 1"
+func (session *Session) Inc(column string, arg interface{}) *Session {
+	session.Statement.Inc(column, arg)
+	return session
+}
+
 // Method Cols provides some columns to special
 func (session *Session) Cols(columns ...string) *Session {
 	session.Statement.Cols(columns...)
@@ -2952,6 +2958,12 @@ func (session *Session) Update(bean interface{}, condiBean ...interface{}) (int6
 		args = append(args, time.Now())
 	}
 
+	//for update action to like "column = column + ?"
+	incColumns := session.Statement.getInc()
+	for k, v := range incColumns {
+		colNames = append(colNames, k+" = "+k+" + ?")
+		args = append(args, v)
+	}
 	var condiColNames []string
 	var condiArgs []interface{}
 

statement.go

@@ -48,6 +48,7 @@ type Statement struct {
 	checkVersion  bool
 	mustColumnMap map[string]bool
 	inColumns     map[string]*inParam
+	incColumns    map[string]interface{}
 }
 
 // init
@@ -470,6 +471,17 @@ func (statement *Statement) Id(id interface{}) *Statement {
 	return statement
 }
 
+// Generate  "Update ... Set column = column + arg" statment
+func (statement *Statement) Inc(column string, arg interface{}) *Statement {
+	k := strings.ToLower(column)
+	statement.incColumns[k] = arg
+	return statement
+}
+
+// Generate  "Update ... Set column = column + arg" statment
+func (statement *Statement) getInc() map[string]interface{} {
+	return statement.incColumns
+}
 // Generate "Where column IN (?) " statment
 func (statement *Statement) In(column string, args ...interface{}) *Statement {
 	k := strings.ToLower(column)