Support extra options for inserting, querying, deleting, updating SQL, …

…close go-gorm#721, go-gorm#769

README.md

@@ -259,6 +259,11 @@ db.Create(&user)
 //// INSERT INTO "languages" ("name") VALUES ('EN');
 //// INSERT INTO user_languages ("user_id","language_id") VALUES (111, 2);
 //// COMMIT;
+
+
+// Add extra SQL option for inserting SQL
+db.Set("gorm:insert_option", "ON CONFLICT").Create(&product)
+// INSERT INTO products (name, code) VALUES ("name", "code") ON CONFLICT;
 ```
 
 Refer [Associations](#associations) for more details
@@ -281,6 +286,10 @@ db.Find(&users)
 // Get record with primary key
 db.First(&user, 10)
 //// SELECT * FROM users WHERE id = 10;
+
+// Add extra SQL option for selecting SQL
+db.Set("gorm:query_option", "FOR UPDATE").First(&user, 10)
+//// SELECT * FROM users WHERE id = 10 FOR UPDATE;
 ```
 
 ### Query With Where (Plain SQL)
@@ -460,6 +469,10 @@ db.Model(&user).Updates(map[string]interface{}{"name": "hello", "age": 18, "acti
 // Update multiple attributes if they are changed (update with struct only works with none zero values)
 db.Model(&user).Updates(User{Name: "hello", Age: 18})
 //// UPDATE users SET name='hello', age=18, updated_at = '2013-11-17 21:34:10' WHERE id = 111;
+
+// Add extra SQL option for updating SQL
+db.Model(&user).Set("gorm:update_option", "OPTION (OPTIMIZE FOR UNKNOWN)").Update("name, "hello")
+//// UPDATE users SET name='hello', updated_at = '2013-11-17 21:34:10' WHERE id=111 OPTION (OPTIMIZE FOR UNKNOWN);
 ```
 
 ### Update Without Callbacks
@@ -513,6 +526,10 @@ DB.Model(&product).Where("quantity > 1").UpdateColumn("quantity", gorm.Expr("qua
 // Delete an existing record
 db.Delete(&email)
 //// DELETE from emails where id=10;
+
+// Add extra SQL option for deleting SQL
+db.Set("gorm:delete_option", "OPTION (OPTIMIZE FOR UNKNOWN)").Delete(&email)
+//// DELETE from emails where id=10 OPTION (OPTIMIZE FOR UNKNOWN);
 ```
 
 ### Batch Delete

callback_create.go

@@ -75,23 +75,34 @@ func createCallback(scope *Scope) {
 			returningColumn = "*"
 			quotedTableName = scope.QuotedTableName()
 			primaryField    = scope.PrimaryField()
+			extraOption     string
 		)
 
+		if str, ok := scope.Get("gorm:insert_option"); ok {
+			extraOption = fmt.Sprint(str)
+		}
+
 		if primaryField != nil {
 			returningColumn = scope.Quote(primaryField.DBName)
 		}
 
 		lastInsertIdReturningSuffix := scope.Dialect().LastInsertIdReturningSuffix(quotedTableName, returningColumn)
 
 		if len(columns) == 0 {
-			scope.Raw(fmt.Sprintf("INSERT INTO %v DEFAULT VALUES %v", quotedTableName, lastInsertIdReturningSuffix))
+			scope.Raw(fmt.Sprintf(
+				"INSERT INTO %v DEFAULT VALUES%v%v",
+				quotedTableName,
+				addExtraSpaceIfExist(extraOption),
+				addExtraSpaceIfExist(lastInsertIdReturningSuffix),
+			))
 		} else {
 			scope.Raw(fmt.Sprintf(
-				"INSERT INTO %v (%v) VALUES (%v) %v",
+				"INSERT INTO %v (%v) VALUES (%v)%v%v",
 				scope.QuotedTableName(),
 				strings.Join(columns, ","),
 				strings.Join(placeholders, ","),
-				lastInsertIdReturningSuffix,
+				addExtraSpaceIfExist(extraOption),
+				addExtraSpaceIfExist(lastInsertIdReturningSuffix),
 			))
 		}
 

callback_delete.go

@@ -21,15 +21,26 @@ func beforeDeleteCallback(scope *Scope) {
 // deleteCallback used to delete data from database or set deleted_at to current time (when using with soft delete)
 func deleteCallback(scope *Scope) {
 	if !scope.HasError() {
+		var extraOption string
+		if str, ok := scope.Get("gorm:delete_option"); ok {
+			extraOption = fmt.Sprint(str)
+		}
+
 		if !scope.Search.Unscoped && scope.HasColumn("DeletedAt") {
-			scope.Raw(
-				fmt.Sprintf("UPDATE %v SET deleted_at=%v %v",
-					scope.QuotedTableName(),
-					scope.AddToVars(NowFunc()),
-					scope.CombinedConditionSql(),
-				)).Exec()
+			scope.Raw(fmt.Sprintf(
+				"UPDATE %v SET deleted_at=%v%v%v",
+				scope.QuotedTableName(),
+				scope.AddToVars(NowFunc()),
+				addExtraSpaceIfExist(scope.CombinedConditionSql()),
+				addExtraSpaceIfExist(extraOption),
+			)).Exec()
 		} else {
-			scope.Raw(fmt.Sprintf("DELETE FROM %v %v", scope.QuotedTableName(), scope.CombinedConditionSql())).Exec()
+			scope.Raw(fmt.Sprintf(
+				"DELETE FROM %v%v%v",
+				scope.QuotedTableName(),
+				addExtraSpaceIfExist(scope.CombinedConditionSql()),
+				addExtraSpaceIfExist(extraOption),
+			)).Exec()
 		}
 	}
 }

callback_query.go

@@ -51,8 +51,13 @@ func queryCallback(scope *Scope) {
 	scope.prepareQuerySql()
 
 	if !scope.HasError() {
+		var extraOption string
+		if str, ok := scope.Get("gorm:query_option"); ok {
+			extraOption = fmt.Sprint(str)
+		}
 		scope.db.RowsAffected = 0
-		if rows, err := scope.SqlDB().Query(scope.Sql, scope.SqlVars...); scope.Err(err) == nil {
+
+		if rows, err := scope.SqlDB().Query(scope.Sql+addExtraSpaceIfExist(extraOption), scope.SqlVars...); scope.Err(err) == nil {
 			defer rows.Close()
 
 			columns, _ := rows.Columns()

callback_update.go

@@ -90,9 +90,18 @@ func updateCallback(scope *Scope) {
 			}
 		}
 
+		var extraOption string
+		if str, ok := scope.Get("gorm:update_option"); ok {
+			extraOption = fmt.Sprint(str)
+		}
+
 		if len(sqls) > 0 {
 			scope.Raw(fmt.Sprintf(
-				"UPDATE %v SET %v %v", scope.QuotedTableName(), strings.Join(sqls, ", "), scope.CombinedConditionSql(),
+				"UPDATE %v SET %v%v%v",
+				scope.QuotedTableName(),
+				strings.Join(sqls, ", "),
+				addExtraSpaceIfExist(scope.CombinedConditionSql()),
+				addExtraSpaceIfExist(extraOption),
 			)).Exec()
 		}
 	}

utils.go

@@ -276,3 +276,10 @@ func getValueFromFields(value reflect.Value, fieldNames []string) (results []int
 	}
 	return
 }
+
+func addExtraSpaceIfExist(str string) string {
+	if str != "" {
+		return " " + str
+	}
+	return ""
+}