diff --git a/Source/Pjango/DB/PCDataBase.swift b/Source/Pjango/DB/PCDataBase.swift
index 357b5b0..00ac442 100644
--- a/Source/Pjango/DB/PCDataBase.swift
+++ b/Source/Pjango/DB/PCDataBase.swift
@@ -141,12 +141,12 @@ open class PCDataBase {
         _pjango_core_log.info("Success on droping table \(PCSqlUtility.schemaAndTableToStr(schema, table))")
     }
     
-    open func selectTable(model: PCMetaModel) -> [PCDataBaseRecord]? {
-        return selectTable(table: model.tableName)
+    open func selectTable(model: PCMetaModel, ext: String? = nil) -> [PCDataBaseRecord]? {
+        return selectTable(table: model.tableName, ext: ext)
     }
     
-    open func selectTable(table: String) -> [PCDataBaseRecord]? {
-        return query(PCSqlUtility.selectTable(schema, table))
+    open func selectTable(table: String, ext: String? = nil) -> [PCDataBaseRecord]? {
+        return query(PCSqlUtility.selectTable(schema, table, ext: ext))
     }
     
     @discardableResult
diff --git a/Source/Pjango/DB/PCFileDBDataBase.swift b/Source/Pjango/DB/PCFileDBDataBase.swift
index 37f7e7f..1695a12 100644
--- a/Source/Pjango/DB/PCFileDBDataBase.swift
+++ b/Source/Pjango/DB/PCFileDBDataBase.swift
@@ -96,11 +96,11 @@ open class PCFileDBDataBase: PCDataBase {
         }
     }
     
-    open override func selectTable(model: PCMetaModel) -> [PCDataBaseRecord]? {
-        return selectTable(table: model.tableName)
+    open override func selectTable(model: PCMetaModel, ext: String? = nil) -> [PCDataBaseRecord]? {
+        return selectTable(table: model.tableName, ext: ext)
     }
     
-    open override func selectTable(table: String) -> [PCDataBaseRecord]? {
+    open override func selectTable(table: String, ext: String? = nil) -> [PCDataBaseRecord]? {
         return _pjango_filedb_doWithLocked {
             let file = File.init(PCFileDBUtility.filePathForTable(path: path, schema: schema!, table: table))
             guard file.exists else {
diff --git a/Source/Pjango/Model/PCModel.swift b/Source/Pjango/Model/PCModel.swift
index ac5128c..fe77fab 100644
--- a/Source/Pjango/Model/PCModel.swift
+++ b/Source/Pjango/Model/PCModel.swift
@@ -87,19 +87,20 @@ open class PCModel: PCObject, PCViewable {
         return nil
     }
     
-    open class func queryObjects() -> [PCModel]? {
+    open class func queryObjects(ext: (useCache: Bool, param: String)? = nil) -> [PCModel]? {
         guard let meta = PjangoRuntime._pjango_runtime_models_name2meta[_pjango_core_class_name] else {
             return nil
         }
         let nowTime = Date.init()
         let records: [PCDataBaseRecord]
-        if let cacheTime = cacheTime,
+        if  ext?.useCache == false,
+            let cacheTime = cacheTime,
             let cache = _pjango_core_model_cache[_pjango_core_class_name],
             let lastCacheTime = _pjango_core_model_cache_time[_pjango_core_class_name],
             nowTime.timeIntervalSince1970 - lastCacheTime <= cacheTime {
             records = cache
         } else {
-            guard let recordsFromDB = PjangoRuntime._pjango_runtime_database.selectTable(model: meta) else {
+            guard let recordsFromDB = PjangoRuntime._pjango_runtime_database.selectTable(model: meta, ext: ext?.param) else {
                 return nil
             }
             _pjango_core_model_cache[_pjango_core_class_name] = recordsFromDB
diff --git a/Source/Pjango/Utility/Extension.swift b/Source/Pjango/Utility/Extension.swift
index 5dbab83..8f61a86 100644
--- a/Source/Pjango/Utility/Extension.swift
+++ b/Source/Pjango/Utility/Extension.swift
@@ -18,9 +18,13 @@ fileprivate var dateFormatter = { () -> DateFormatter in
 
 public extension Date {
     var stringValue: String {
-        get {
-            return dateFormatter.string(from: self)
-        }
+        return dateFormatter.string(from: self)
+    }
+}
+
+public extension String {
+    var dateValue: Date? {
+        return dateFormatter.date(from: self)
     }
 }
 
diff --git a/Source/Pjango/Utility/PCSqlUtility.swift b/Source/Pjango/Utility/PCSqlUtility.swift
index f049ea5..b39ae53 100644
--- a/Source/Pjango/Utility/PCSqlUtility.swift
+++ b/Source/Pjango/Utility/PCSqlUtility.swift
@@ -44,13 +44,13 @@ final public class PCSqlUtility {
         return "DROP TABLE \(schemaAndTableToStr(schema, table));"
     }
     
-    public static func selectTable(_ schema: String? = nil, _ table: String, _ fields: String = "*") -> PCSqlStatement {
-        return "SELECT \(fields) FROM \(schemaAndTableToStr(schema, table));"
+    public static func selectTable(_ schema: String? = nil, _ table: String, _ fields: String = "*", ext: String? = nil) -> PCSqlStatement {
+        return "SELECT \(fields) FROM \(schemaAndTableToStr(schema, table)) \(ext ?? "");"
     }
     
     public static func insertRecord(_ schema: String? = nil, _ table: String, _ record: PCDataBaseRecord) -> PCSqlStatement {
         let recordStr = record.reduce("'0'") {
-            "\($0), '\(($1))'"
+            "\($0), '\(($1.replacingOccurrences(of: "'", with: "\\'")))'"
         }
         return "INSERT INTO \(schemaAndTableToStr(schema, table)) VALUES (\(recordStr))"
     }
@@ -59,7 +59,7 @@ final public class PCSqlUtility {
         var updateStr = ""
         for i in 0..<fields.count {
             let field = fields[i]
-            let value = record[i] 
+            let value = record[i]
             updateStr += "`\(field)`='\(value)'"
             if i < fields.count - 1 {
                 updateStr += ","