diff --git a/expression_ext.go b/expression_ext.go
index cafd87e7..abddfeb7 100644
--- a/expression_ext.go
+++ b/expression_ext.go
@@ -383,6 +383,32 @@ func (e *expr) NotIn(values ...interface{}) *expr {
 	return e.in(" NOT", values...)
 }
 
+func (e *expr) orderByCase(orderValues []interface{}) *expr {
+	e.expr = "( CASE " + e.expr
+
+	for i, orderValue := range orderValues {
+		e.expr += fmt.Sprintf(" WHEN %d THEN %d ELSE %d", orderValue, i+1, i+2)
+	}
+
+	e.expr += " END )"
+
+	return e
+}
+
+func (e *expr) OrderByCaseASC(orderValues ...interface{}) *expr {
+	e = e.orderByCase(orderValues)
+	e.expr += " ASC"
+
+	return e
+}
+
+func (e *expr) OrderByCaseDESC(orderValues ...interface{}) *expr {
+	e = e.orderByCase(orderValues)
+	e.expr += " DESC"
+
+	return e
+}
+
 func (e *expr) OrderAsc() string {
 	return e.expr + " ASC "
 }
@@ -451,77 +477,3 @@ func (db *DB) FormatDate(e *expr, format string) *expr {
 func (db *DB) FormatDateColumn(e *expr, format string) string {
 	return db.FormatDate(e, format).expr
 }
-
-func (db *DB) GetSQL() string {
-	scope := db.NewScope(db.Value)
-
-	scope.prepareQuerySQL()
-
-	stmt := strings.ReplaceAll(scope.SQL, "$$$", "?")
-	for _, arg := range scope.SQLVars {
-		stmt = strings.Replace(stmt, "?", "'"+escape(fmt.Sprintf("%v", arg))+"'", 1)
-	}
-
-	return stmt
-}
-
-func (db *DB) GetSQLWhereClause() string {
-	scope := db.NewScope(db.Value)
-
-	stmt := strings.Replace(strings.ReplaceAll(scope.whereSQL(), "$$$", "?"), "WHERE", "", 1)
-
-	for _, arg := range scope.SQLVars {
-		stmt = strings.Replace(stmt, "?", "'"+escape(fmt.Sprintf("%v", arg))+"'", 1)
-	}
-
-	return stmt
-}
-
-func escape(source string) string {
-	var j int = 0
-	if len(source) == 0 {
-		return ""
-	}
-	tempStr := source[:]
-	desc := make([]byte, len(tempStr)*2)
-	for i := 0; i < len(tempStr); i++ {
-		flag := false
-		var escape byte
-		switch tempStr[i] {
-		case '\r':
-			flag = true
-			escape = '\r'
-
-		case '\n':
-			flag = true
-			escape = '\n'
-
-		case '\\':
-			flag = true
-			escape = '\\'
-
-		case '\'':
-			flag = true
-			escape = '\''
-
-		case '"':
-			flag = true
-			escape = '"'
-
-		case '\032':
-			flag = true
-			escape = 'Z'
-
-		default:
-		}
-		if flag {
-			desc[j] = '\\'
-			desc[j+1] = escape
-			j = j + 2
-		} else {
-			desc[j] = tempStr[i]
-			j = j + 1
-		}
-	}
-	return string(desc[0:j])
-}