mysql实现动态查询表字段（返回JSON格式）
-- 准备测试配置表DROP TABLE IF EXISTS `field_config`;CREATE TABLE `field_config` ( `text` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL) ENGINE = InnoDB AUTO_INCREMENT = 5 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORM..
