mssql如何实现多表快速like查询
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mssql如何实现多表快速查询
我的mssql有20多个表,每个表有记录5万条左右,
程序用的是asp,也就是vb
我现在想在这20多个表查询满足条件的记录,用的是 like '%关键词%' 的模糊查询
我想问,如何能快速的在asp页面显示出查询结果???
最好能在1秒内,
我自己写的程序要5秒左右,我自己是用union语句写的
我是新手
请问触发器在哪呢?
有没有写触发器的教程呢?
MybatisPlus多表连接查询一对多分页查询数据
一、序言
在日常一线开发过程中,多表连接查询不可或缺,基于MybatisPlus多表连接查询究竟该如何实现,本文将带你找到答案。
在多表连接查询中,既有查询单条记录的情况,又有列表查询,还有分页查询,这些需求与多表连接是什么关系,又该如何实现,这是本文讨论的中心内容。
二、实战编码
1、两个关联DO
部门DO
@Data
@NoArgsConstructor
@AllArgsConstructor
@TableName(value = "tb_dept")
public class Dept
private static final long serialVersionUID = 1L;
@TableId(type = IdType.AUTO)
private Long deptId;
private String deptName;
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
private LocalDateTime gmtCreate;
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
private LocalDateTime gmtModified;
private String tel;
public Dept(Dept dept)
if (Objects.nonNull(dept))
this.deptId = dept.deptId;
this.deptName = dept.deptName;
this.gmtCreate = dept.gmtCreate;
this.gmtModified = dept.gmtModified;
this.tel = dept.tel;
用户DO
@Data
@NoArgsConstructor
@AllArgsConstructor
@TableName(value = "tb_user")
public class User
private static final long serialVersionUID = 1L;
private Integer age;
private Long deptId;
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
private LocalDateTime gmtCreate;
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
private LocalDateTime gmtModified;
@TableId(type = IdType.AUTO)
private Long userId;
private String userName;
public User(User user)
if (Objects.nonNull(user))
this.age = user.age;
this.deptId = user.deptId;
this.gmtCreate = user.gmtCreate;
this.gmtModified = user.gmtModified;
this.userId = user.userId;
this.userName = user.userName;
2、部门VO
@Data
@NoArgsConstructor
@AllArgsConstructor
public class DeptVo extends Dept
private List<User> userList;
/**
* 实现部门DO 转 部门VO
* @param dept
*/
public DeptVo(Dept dept)
super(dept);
3、普通编码查询数据
public IPage<DeptVo> selectDeptPage3()
LambdaQueryWrapper<Dept> wrapper = Wrappers.lambdaQuery(Dept.class);
Page<Dept> deptPage = this.page(new Page<>(1, 3), wrapper);
IPage<DeptVo> deptVoPage = EntityUtils.toPage(deptPage, DeptVo::new);
// 完成userList字段属性注入
Set<Long> deptIds = EntityUtils.toSet(deptVoPage.getRecords(), DeptVo::getDeptId);
if (deptIds.size() > 0)
List<User> userList = userMapper.selectList(Wrappers.lambdaQuery(User.class)
.in(User::getDeptId, deptIds));
Map<Long, List<User>> map = EntityUtils.groupBy(userList, User::getDeptId);
for (DeptVo deptVo : deptVoPage.getRecords())
deptVo.setUserList(map.get(deptVo.getDeptId()));
return deptVoPage;
4、使用工具类查询数据
优化版 一行代码完成userList属性注入
/**
* 优化版 一行代码完成userList属性注入
*/
@Override
public IPage<DeptVo> selectDeptPage4()
LambdaQueryWrapper<Dept> wrapper = Wrappers.lambdaQuery(Dept.class);
Page<Dept> deptPage = this.page(new Page<>(1, 3), wrapper);
IPage<DeptVo> deptVoPage = EntityUtils.toPage(deptPage, DeptVo::new);
// 一行代码完成userList属性注入
FieldInjectUtils.injectListField(deptVoPage, DeptVo::getDeptId, UserServiceImpl.class, User::getDeptId, DeptVo::getUserList);
return deptVoPage;
需要指出的是FieldInjectUtils
在工具包下
<dependency>
<groupId>xin.altitude.cms</groupId>
<artifactId>ucode-cms-common</artifactId>
<version>1.5.9.2</version>
</dependency>
学习源码的朋友,源码直通车
5、演示数据
"code": 200,
"msg": "操作成功",
"data":
"records": [
"deptId": "10",
"deptName": "Java",
"gmtCreate": "2020-10-30 11:48:19",
"gmtModified": "2021-05-24 15:11:17",
"tel": "88886666",
"userList": [
"age": 12,
"deptId": "10",
"gmtCreate": null,
"gmtModified": "2022-11-05 16:44:22",
"userId": "1",
"userName": "Jone"
]
,
"deptId": "11",
"deptName": "Mysql",
"gmtCreate": "2020-10-30 11:48:44",
"gmtModified": "2021-05-24 15:11:20",
"tel": "80802121",
"userList": [
"age": 23,
"deptId": "11",
"gmtCreate": null,
"gmtModified": "2022-11-05 16:44:24",
"userId": "2",
"userName": "Jack"
,
"age": 21,
"deptId": "11",
"gmtCreate": "2022-11-05 16:09:42",
"gmtModified": "2022-11-05 16:11:28",
"userId": "5",
"userName": "滴滴"
]
,
"deptId": "12",
"deptName": "Tomcat",
"gmtCreate": "2020-10-30 11:48:44",
"gmtModified": "2021-05-24 15:11:23",
"tel": "23231212",
"userList": [
"age": 22,
"deptId": "12",
"gmtCreate": null,
"gmtModified": "2022-11-05 16:44:27",
"userId": "3",
"userName": "Billie"
,
"age": 12,
"deptId": "12",
"gmtCreate": "2021-06-05 19:22:46",
"gmtModified": "2021-10-21 14:38:26",
"userId": "4",
"userName": "didi"
,
"age": 18,
"deptId": "12",
"gmtCreate": "2022-11-05 16:10:48",
"gmtModified": "2022-11-05 16:11:36",
"userId": "6",
"userName": "嗒嗒"
]
],
"total": 4,
"size": 3,
"current": 1,
"orders": [],
"optimizeCountSql": true,
"searchCount": true,
"countId": null,
"maxLimit": null,
"pages": 2
三、小结
本文完成了MybatisPlus一对多分页查询数据的开发需求。
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