diff --git a/core/entity/database.go b/core/entity/database.go
index 073fc6a8..1c067dd4 100644
--- a/core/entity/database.go
+++ b/core/entity/database.go
@@ -19,7 +19,7 @@ type DatabaseColumn struct {
 	Name         string           `json:"name"`
 	Type         string           `json:"type"`
 	PrimaryKey   bool             `json:"primary_key,omitempty"`
-	Null         bool             `json:"null"`
+	NotNull      bool             `json:"not_null"`
 	Key          string           `json:"key,omitempty"`
 	Default      string           `json:"default"`
 	Extra        string           `json:"extra,omitempty"`