数据库sql查询语句备忘

SELECT
	menu. NAME
FROM
	t_sys_auth_menu AS auth_menu
LEFT JOIN t_sys_menu AS menu ON menu.id = auth_menu.menu_id
WHERE
	auth_menu.auth_id IN (
		SELECT DISTINCT
			auth_id
		FROM
			t_sys_role_auth AS role_auth
		WHERE
			role_auth.role_id IN (
				SELECT
					role_id
				FROM
					t_sys_user_role AS user_role
				WHERE
					user_id = 3
			)
	)

数据库结构和简单测试数据留存

/*
Navicat MySQL Data Transfer

Source Server         : BInhai
Source Server Version : 50145
Source Host           : 192.168.1.200:3306
Source Database       : binhaifast2

Target Server Type    : MYSQL
Target Server Version : 50145
File Encoding         : 65001

Date: 2014-06-26 13:58:57
*/

SET FOREIGN_KEY_CHECKS=0;

-- ----------------------------
-- Table structure for `t_sys_auth`
-- ----------------------------
DROP TABLE IF EXISTS `t_sys_auth`;
CREATE TABLE `t_sys_auth` (
  `id` int(11) NOT NULL,
  `name` varchar(255) CHARACTER SET utf8 NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=gbk;

-- ----------------------------
-- Records of t_sys_auth
-- ----------------------------
INSERT INTO `t_sys_auth` VALUES ('1', '查看成绩');
INSERT INTO `t_sys_auth` VALUES ('2', '打印成绩');
INSERT INTO `t_sys_auth` VALUES ('3', '录入成绩');
INSERT INTO `t_sys_auth` VALUES ('4', '添加学生');
INSERT INTO `t_sys_auth` VALUES ('5', '修改成绩');
INSERT INTO `t_sys_auth` VALUES ('6', '删除学生成绩');
INSERT INTO `t_sys_auth` VALUES ('7', '查看学生信息');
INSERT INTO `t_sys_auth` VALUES ('8', '修改学生信息');
INSERT INTO `t_sys_auth` VALUES ('9', '添加学生信息');
INSERT INTO `t_sys_auth` VALUES ('10', '查看通知');
INSERT INTO `t_sys_auth` VALUES ('11', '修改通知');
INSERT INTO `t_sys_auth` VALUES ('12', '添加通知');
INSERT INTO `t_sys_auth` VALUES ('13', '删除通知');

-- ----------------------------
-- Table structure for `t_sys_auth_menu`
-- ----------------------------
DROP TABLE IF EXISTS `t_sys_auth_menu`;
CREATE TABLE `t_sys_auth_menu` (
  `auth_id` int(11) NOT NULL,
  `menu_id` int(11) NOT NULL,
  PRIMARY KEY (`auth_id`,`menu_id`),
  KEY `index_relation_auth` (`auth_id`) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=gbk;

-- ----------------------------
-- Records of t_sys_auth_menu
-- ----------------------------
INSERT INTO `t_sys_auth_menu` VALUES ('1', '1');
INSERT INTO `t_sys_auth_menu` VALUES ('1', '2');
INSERT INTO `t_sys_auth_menu` VALUES ('1', '3');
INSERT INTO `t_sys_auth_menu` VALUES ('4', '1');
INSERT INTO `t_sys_auth_menu` VALUES ('4', '2');
INSERT INTO `t_sys_auth_menu` VALUES ('4', '3');
INSERT INTO `t_sys_auth_menu` VALUES ('4', '4');

-- ----------------------------
-- Table structure for `t_sys_menu`
-- ----------------------------
DROP TABLE IF EXISTS `t_sys_menu`;
CREATE TABLE `t_sys_menu` (
  `id` int(11) NOT NULL,
  `name` varchar(255) CHARACTER SET utf8 NOT NULL,
  `parent_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=gbk;

-- ----------------------------
-- Records of t_sys_menu
-- ----------------------------
INSERT INTO `t_sys_menu` VALUES ('1', '当月报表', null);
INSERT INTO `t_sys_menu` VALUES ('2', '当月盈利', null);
INSERT INTO `t_sys_menu` VALUES ('3', '当月负债', null);
INSERT INTO `t_sys_menu` VALUES ('4', '总公司合计', null);

-- ----------------------------
-- Table structure for `t_sys_role`
-- ----------------------------
DROP TABLE IF EXISTS `t_sys_role`;
CREATE TABLE `t_sys_role` (
  `role_id` int(11) NOT NULL,
  `role_name` varchar(255) CHARACTER SET utf8 NOT NULL,
  PRIMARY KEY (`role_id`)
) ENGINE=InnoDB DEFAULT CHARSET=gbk;

-- ----------------------------
-- Records of t_sys_role
-- ----------------------------
INSERT INTO `t_sys_role` VALUES ('1', '学生');
INSERT INTO `t_sys_role` VALUES ('2', '老师');
INSERT INTO `t_sys_role` VALUES ('3', '教务处');
INSERT INTO `t_sys_role` VALUES ('4', '毕业生');
INSERT INTO `t_sys_role` VALUES ('5', '研究生');

-- ----------------------------
-- Table structure for `t_sys_role_auth`
-- ----------------------------
DROP TABLE IF EXISTS `t_sys_role_auth`;
CREATE TABLE `t_sys_role_auth` (
  `role_id` int(11) NOT NULL,
  `auth_id` int(11) NOT NULL,
  PRIMARY KEY (`role_id`,`auth_id`)
) ENGINE=InnoDB DEFAULT CHARSET=gbk;

-- ----------------------------
-- Records of t_sys_role_auth
-- ----------------------------
INSERT INTO `t_sys_role_auth` VALUES ('1', '1');
INSERT INTO `t_sys_role_auth` VALUES ('1', '2');
INSERT INTO `t_sys_role_auth` VALUES ('3', '1');
INSERT INTO `t_sys_role_auth` VALUES ('3', '2');
INSERT INTO `t_sys_role_auth` VALUES ('3', '3');
INSERT INTO `t_sys_role_auth` VALUES ('3', '4');

-- ----------------------------
-- Table structure for `t_sys_user`
-- ----------------------------
DROP TABLE IF EXISTS `t_sys_user`;
CREATE TABLE `t_sys_user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(100) CHARACTER SET utf8 NOT NULL,
  `password` varchar(50) CHARACTER SET utf8 NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=gbk;

-- ----------------------------
-- Records of t_sys_user
-- ----------------------------
INSERT INTO `t_sys_user` VALUES ('1', '用户A', '111111');
INSERT INTO `t_sys_user` VALUES ('2', '用户B', '222222');
INSERT INTO `t_sys_user` VALUES ('3', '用户C', '333333');

-- ----------------------------
-- Table structure for `t_sys_user_role`
-- ----------------------------
DROP TABLE IF EXISTS `t_sys_user_role`;
CREATE TABLE `t_sys_user_role` (
  `user_id` int(11) NOT NULL,
  `role_id` int(11) NOT NULL,
  PRIMARY KEY (`user_id`,`role_id`)
) ENGINE=InnoDB DEFAULT CHARSET=gbk;

-- ----------------------------
-- Records of t_sys_user_role
-- ----------------------------
INSERT INTO `t_sys_user_role` VALUES ('1', '1');
INSERT INTO `t_sys_user_role` VALUES ('1', '2');
INSERT INTO `t_sys_user_role` VALUES ('3', '1');
INSERT INTO `t_sys_user_role` VALUES ('3', '2');
INSERT INTO `t_sys_user_role` VALUES ('3', '3');

万能LEFT JOIN 上场：

SELECT
	*
FROM
	t_sys_menu AS menu
LEFT JOIN t_sys_auth_menu AS auth_menu ON menu.id = auth_menu.menu_id
LEFT JOIN t_sys_role_auth AS role_auth ON auth_menu.auth_id = role_auth.auth_id
LEFT JOIN t_sys_user_role AS user_role ON user_role.role_id =role_auth.role_id
WHERE user_role.user_id = 3;

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