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Apache-2.0

multipleselect

java mybatis 实现简单多表通用查询

中后台 vue ElementUI 組件版

(文檔地址)[http://115.159.65.195:8080/vefdoc/#/start]

歡迎交流

简介

实现项目中比较基本的多表通用查询。

​ 实现简单的实体类操作多表, 首先你的项目是使用了mybatis-plus 才可以使用。

​ 不做任何更改,也不会对项目产生任何影响,与手写XML 功能一样。

​ 通过解析实体,调用通用的XML来实现多表查询, 提供一个设计多表查询的思路,复杂的Sql嵌套等目前并不支持。

目前支持:

​ left join方式,能关联的两张表的实体中关联字段名称必须一样,数据库字段可以不一样可以通@TableField注解来解决,right join 换个位置喽 其它方式还没有)

​ where 基本查询条件, sql函数 等

​ 分页 查询

​ order 排序

​ 简易 group by, 还没有Having哦

可以用来三两句搞定一些简单关联查询业务,解决不需要写的代码

设计说明

  • 如何关联表?

    ​ 找第一张表注解为 TableId (mybatis-plus 注解)的属性名, 到每二张表找同样的属性名, 如果没找到,反过来找,如果还没找到,挨个属性找。以此类推,实现关联的前提条件是 主从表的实体关联列名必须是一样的

    // user 表
    @TableId
    private Integer userId
    // address 表
    @TableId
    private Integer addressId
    private Integer userId
    //那么自动条件为  user.user_id = address.user_id
    //也可以是
    @TableId(value="id")
    private Integer userId
    // address 表
    @TableId(value="id")
    private Integer addressId
    @TableField(value="test_user_id")
    private Integer userId
    //目前只有left join
    //那么自动条件为  user.id = address.test_user_id
    //如果符合这设计条件,你就往里扔就完事了
    

使用说明

1.将 com.freedomen.multipselect 包放到你的项目中

2.使 com.freedomen.multipselect.mapper里的xml 要被扫描到,或手动配置

  1. com.freedomen.multipselect.service也要被发现
//引入service
@Autowired
private MultipleService multipleService;
//表关联, 关联用户表和地址表,查找 用户表的所有字段和地址表的所有字段
MultipleSelect multipleSelect = MultipleSelect.newInstance("${1}", new User(), new Address());

multipleSelect
	.where("${0}")
    .like("userName", "张三");

multipleService.mulSelect(multipleSelect);

查找字段

//MultipleSelect.newInstance 的第一个参数是所要查找的字段
//${0} 或 ${user} 表是第一张表的所有字段  ${0}.userName或${user}.userName表示userName字段, 默认第一张表的字段全部都返回的。 ${}中间的参数可以是后面实体的下标,也可以是表名 如user、user_address
//字段中有@TableField(exist=false)注解也是被跳过的
//下面是要订单表的所有信息 和用户的姓名与号码 和地址

MultipleSelect.newInstance("${1}.userName,${1}.userPhone,${2}", new Orders(), new User(), new Address());

查找条件

  • eq: =
  • notEq: !=
  • like: LIKE (前置已经加了 '%')
  • between: between
  • and: 改变接下来的连接方式为 AND练级(默认)
  • andOnce: 改变接下来一个的连接方式为 AND
  • or: 改变接下来的连接方式为 OR
  • orOnce 改变接下来一个的连接方式为 OR
  • division:括号 ,不支持括号嵌套括号
  • in: IN
  • notIn: NOT IN
  • notLike: NOT LIKE
  • isNull: IS NULL
  • isNotNull: IS NOT NULL
  • sql: 简易自定义带sql代码片段
  • ...
//实例好 查找实体后可以操作实体

//注意: 如何实体内属性有值  将会以 eq方式and连接做为where 条件
/*
可以关联的必要条件
Orders:
	@TableId //或者数据库字段为其它@TableId(value="id")
	private Long ordersId;
	private Long userId;
	...
User: 
	@TableId
	private Long userId;
	...
Address:
	@TableId
	private Long addressId;
	private Long userId;
	...
*/
MultipleSelect multipleSelect = MultipleSelect.newInstance("${1}.userName,${1}.userPhone,${2}", new Orders(), new User(), new Address());

multipleSelect
	.where("${0}") //哪张表
	.eq("ordersId", 1) //并且 订单id = 1
	.like("ordersName", "cmcc") //并且 订单名称 like ''%cmcc'
	.or() //改变后续操作关系为 OR, 默认为AND
    .notEq("orderSno", "123"); //或者 orderSno 不等于 '123'
    
multipleSelect
	.where("${1}") //哪张表接着用户表 默认and连接  可以 .or()改为 OR
	.in("userId", [1, 2, 3]); // 并且userId in [1, 2, 3]
    
multipleSelect
	.where("${2}")
    .or()
	.like("adressDetails", "江苏"); //或者  地址 like '江苏'

multipleService.mulSelect(multipleSelect); //查询

//括号
multipleSelect.where("${0}")
    .eq("componyId", 1)
    .division()
    .like("userName", "abcd")
    .or()
    .like("userPhone", "abcd");
// 部分sql: compony_id = 1 and (user_name = 'abcd' or user_phone = 'abcd')    

排序

//MultipleSelect.setOrderBy(...columns)
MultipleSelect.setOrderBy("${0}.createTime", "${1}.ordersName desc", "${2}.userId asc", ...)

分组

//分组一般都要结合聚集函数使用,可以使用的:AVG, COUNT, MAX, MIN, SUM
/**统计用户订单总额*/ 
// 聚集函数使用 函数名:${表名/下标}.属性名; 不可以重命名哦, 下面的sum 字段仍然是 price
MultipleSelect.newInstance("${1}, sum:${0}.price", new Orders(), new User());
//(...columns)
MultipleSelect.setGoupBy("${0}.userId", ...);

SQL 方法使用

//如  查找创建日期为 2019年10月 的订单;
//两个问号对应两个参数, 其中使用的仍然是实体的Filed名,不是数据表的字段名
multipleSelect.where("${orders}").sql("year(createTime)=? and month(createTime)=?", new Object[]{2019, 10});

分页

//MultipleSelect.setPage(pageNo, pageSize);
MultipleSelect.setPage(1, 15); //第一页 每页 15条

multipleService.mulSelect返回结果

//MultipleResult
/*	原型
	private List<Map<String, Object>> data; //结果数据
	private Integer pageNo; 	//如果设置了分页 会有
	private Integer pageSize; 	//如果设置了分页 会有
	private Integer total;		//如果设置了分页 会有
*/

逻辑删除

//默认是读取  mybatis-plus 的 TableLogic 注解 0 未删除,
//如果不是用 0 表示未删除, 可以修改 MultipleSelect 的 setCustomWhere 方法中的下面这段中的 0 
 
if (logic != null)
    sb.append(" AND ")
    .append(te.getNickName())
    .append(".")
    .append(logic)
    .append(" = ")
    .append("0");
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