diff --git a/crates/erp-plugin/src/manifest.rs b/crates/erp-plugin/src/manifest.rs
index a5986f9..df08b4c 100644
--- a/crates/erp-plugin/src/manifest.rs
+++ b/crates/erp-plugin/src/manifest.rs
@@ -83,6 +83,56 @@ pub enum PluginFieldType {
     Decimal,
 }
 
+impl PluginFieldType {
+    /// Generated Column 的 SQL 类型
+    pub fn generated_sql_type(&self) -> &'static str {
+        match self {
+            Self::String | Self::Json => "TEXT",
+            Self::Integer => "INTEGER",
+            Self::Float => "DOUBLE PRECISION",
+            Self::Decimal => "NUMERIC",
+            Self::Boolean => "BOOLEAN",
+            Self::Date => "DATE",
+            Self::DateTime => "TIMESTAMPTZ",
+            Self::Uuid => "UUID",
+        }
+    }
+
+    /// Generated Column 的表达式
+    pub fn generated_expr(&self, field_name: &str) -> String {
+        match self {
+            Self::String | Self::Json => format!("data->>'{}'", field_name),
+            _ => format!("(data->>'{}')::{}", field_name, self.generated_sql_type()),
+        }
+    }
+
+    /// 该类型是否适合生成 Generated Column
+    pub fn supports_generated_column(&self) -> bool {
+        !matches!(self, Self::Json)
+    }
+}
+
+impl PluginField {
+    /// 测试辅助：构造一个全默认值的 PluginField
+    #[cfg(test)]
+    pub fn default_for_field() -> Self {
+        Self {
+            name: String::new(),
+            field_type: PluginFieldType::String,
+            required: false,
+            unique: false,
+            default: None,
+            display_name: None,
+            ui_widget: None,
+            options: None,
+            searchable: None,
+            filterable: None,
+            sortable: None,
+            visible_when: None,
+        }
+    }
+}
+
 /// 索引定义
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct PluginIndex {
@@ -529,4 +579,24 @@ label = "空标签页"
         let result = parse_manifest(toml);
         assert!(result.is_err());
     }
+
+    #[test]
+    fn field_type_to_sql_mapping() {
+        assert_eq!(PluginFieldType::String.generated_sql_type(), "TEXT");
+        assert_eq!(PluginFieldType::Integer.generated_sql_type(), "INTEGER");
+        assert_eq!(PluginFieldType::Float.generated_sql_type(), "DOUBLE PRECISION");
+        assert_eq!(PluginFieldType::Decimal.generated_sql_type(), "NUMERIC");
+        assert_eq!(PluginFieldType::Boolean.generated_sql_type(), "BOOLEAN");
+        assert_eq!(PluginFieldType::Date.generated_sql_type(), "DATE");
+        assert_eq!(PluginFieldType::DateTime.generated_sql_type(), "TIMESTAMPTZ");
+        assert_eq!(PluginFieldType::Uuid.generated_sql_type(), "UUID");
+        assert_eq!(PluginFieldType::Json.generated_sql_type(), "TEXT");
+    }
+
+    #[test]
+    fn field_type_generated_expression() {
+        assert_eq!(PluginFieldType::String.generated_expr("name"), "data->>'name'");
+        assert_eq!(PluginFieldType::Integer.generated_expr("age"), "(data->>'age')::INTEGER");
+        assert_eq!(PluginFieldType::Uuid.generated_expr("ref_id"), "(data->>'ref_id')::UUID");
+    }
 }