diff --git a/orm/db.go b/orm/db.go
index 9a1827e8..5d175bf1 100644
--- a/orm/db.go
+++ b/orm/db.go
@@ -49,6 +49,12 @@ var (
 		"eq":          true,
 		"nq":          true,
 		"ne":          true,
+		">":           true,
+		">=":          true,
+		"<":           true,
+		"<=":          true,
+		"=":           true,
+		"!=":          true,
 		"startswith":  true,
 		"endswith":    true,
 		"istartswith": true,
diff --git a/orm/db_mysql.go b/orm/db_mysql.go
index 6e99058e..36f6f566 100644
--- a/orm/db_mysql.go
+++ b/orm/db_mysql.go
@@ -29,11 +29,17 @@ var mysqlOperators = map[string]string{
 	// "regex":       "REGEXP BINARY ?",
 	// "iregex":      "REGEXP ?",
 	"gt":          "> ?",
+	">":           "> ?",
 	"gte":         ">= ?",
+	">=":          ">= ?",
 	"lt":          "< ?",
+	"<":           "< ?",
 	"lte":         "<= ?",
+	"<=":          "<= ?",
 	"eq":          "= ?",
+	"=":           "= ?",
 	"ne":          "!= ?",
+	"!=":          "!= ?",
 	"startswith":  "LIKE BINARY ?",
 	"endswith":    "LIKE BINARY ?",
 	"istartswith": "LIKE ?",
diff --git a/orm/db_oracle.go b/orm/db_oracle.go
index 5d121f83..ed2ec74c 100644
--- a/orm/db_oracle.go
+++ b/orm/db_oracle.go
@@ -22,10 +22,15 @@ import (
 // oracle operators.
 var oracleOperators = map[string]string{
 	"exact":       "= ?",
+	"=":           "= ?",
 	"gt":          "> ?",
+	">":           "> ?",
 	"gte":         ">= ?",
+	">=":          ">= ?",
 	"lt":          "< ?",
+	"<":           "< ?",
 	"lte":         "<= ?",
+	"<=":          "<= ?",
 	"//iendswith": "LIKE ?",
 }
 
diff --git a/orm/db_postgres.go b/orm/db_postgres.go
index c488fb38..7eb88d7a 100644
--- a/orm/db_postgres.go
+++ b/orm/db_postgres.go
@@ -26,11 +26,17 @@ var postgresOperators = map[string]string{
 	"contains":    "LIKE ?",
 	"icontains":   "LIKE UPPER(?)",
 	"gt":          "> ?",
+	">":           "> ?",
 	"gte":         ">= ?",
+	">=":          ">= ?",
 	"lt":          "< ?",
+	"<":           "< ?",
 	"lte":         "<= ?",
+	"<=":          "<= ?",
 	"eq":          "= ?",
+	"=":           "= ?",
 	"ne":          "!= ?",
+	"!=":          "!= ?",
 	"startswith":  "LIKE ?",
 	"endswith":    "LIKE ?",
 	"istartswith": "LIKE UPPER(?)",
diff --git a/orm/db_sqlite.go b/orm/db_sqlite.go
index 1d62ee34..bd9f5d3b 100644
--- a/orm/db_sqlite.go
+++ b/orm/db_sqlite.go
@@ -28,11 +28,17 @@ var sqliteOperators = map[string]string{
 	"contains":    "LIKE ? ESCAPE '\\'",
 	"icontains":   "LIKE ? ESCAPE '\\'",
 	"gt":          "> ?",
+	">":           "> ?",
 	"gte":         ">= ?",
+	">=":          ">= ?",
 	"lt":          "< ?",
+	"<":           "< ?",
 	"lte":         "<= ?",
+	"<=":          "<= ?",
 	"eq":          "= ?",
+	"=":           "= ?",
 	"ne":          "!= ?",
+	"!=":          "!= ?",
 	"startswith":  "LIKE ? ESCAPE '\\'",
 	"endswith":    "LIKE ? ESCAPE '\\'",
 	"istartswith": "LIKE ? ESCAPE '\\'",