support db_type in ddl (#5404)

* support db_type in ddl

* postgres test fixed

* CHANGELOG.md

* mysql bug

client/orm/internal/models/models_info_f.go

@@ -140,6 +140,7 @@ type FieldInfo struct {
 	OnDelete            string
 	Description         string
 	TimePrecision       *int
+	DBType              string
 }
 
 // NewFieldInfo new field info
@@ -308,6 +309,7 @@ checkType:
 	fi.Null = attrs["null"]
 	fi.Index = attrs["index"]
 	fi.Auto = attrs["auto"]
+	fi.DBType = tags["db_type"]
 	fi.Pk = attrs["pk"]
 	fi.Unique = attrs["unique"]
 

client/orm/internal/models/models_utils.go

@@ -48,6 +48,7 @@ var supportTag = map[string]int{
 	"type":         2,
 	"description":  2,
 	"precision":    2,
+	"db_type":      2,
 }
 
 type fn func(string) string