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本篇內容介紹了“Springboot+Mybatis怎么實現分頁加條件查詢功能”的有關知識,在實際案例的操作過程中,不少人都會遇到這樣的困境,接下來就讓小編帶領大家學習一下如何處理這些情況吧!希望大家仔細閱讀,能夠學有所成!
User.xml
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.shelbourne.schooldelivery.mapper.UserMapper"> <!-- 用戶更新--> <update id="update">-- 這里的id為函數名 update user <set> <if test="username != null and username !=''"> username=#{username}, </if> <if test="nickname != null and nickname !=''"> nickname=#{nickname}, </if> <if test="email != null and email !=''"> email=#{email}, </if> <if test="phone != null and phone !=''"> phone=#{phone}, </if> <if test="address != null and address !=''"> address=#{address} </if> </set> <where> id = #{id} </where> </update> <!-- 分頁+條件查詢--> <select id="selectPageWithParam" resultType="com.shelbourne.schooldelivery.entity.User"> select * from user <include refid="condition"></include> limit #{startIdx},#{size} </select> <!-- 查詢滿足條件的用戶總數--> <select id="selectTotalWithParam" resultType="java.lang.Integer"> select count(*) from user <include refid="condition"></include> </select> <!-- 查詢條件--> <sql id="condition"> <where> 1=1 <if test="username != null and username != ''"> and username like concat("%",#{username},"%") </if> <if test="email != null and email != ''"> and email like concat("%",#{email},"%") </if> <if test="address != null and address != ''"> and address like concat("%",#{address},"%") </if> </where> </sql> </mapper>
UserMapper.java
package com.shelbourne.schooldelivery.mapper; import com.shelbourne.schooldelivery.entity.User; import org.apache.ibatis.annotations.*; import java.util.List; @Mapper public interface UserMapper { //查詢所有用戶 @Select("select * from user") //mybatis提供注解,注意SQL語句后不能加分號 List<User> findAll(); //新增用戶 @Insert("insert into user(username,password,nickname,email,phone,address)" + "values(#{username},#{password},#{nickname},#{email},#{phone},#{address})") public Integer insert(User user); //通過注解(靜態)和xml里面(動態)兩種方式編寫SQL語句 int update(User user); //刪除單個用戶 @Delete("delete from user where id=#{id}") Integer deleteById(@Param("id") Integer id);//最后加上@Param參數,參數名和上面的#{}里面的一樣 //查詢記錄條數 @Select("select count(*) from user") Integer selectTotal(); //編寫動態SQL實現分頁查詢+條件查詢 //查詢滿足條件的某一頁用戶 List<User> selectPageWithParam(Integer startIdx, Integer size, String username, String email, String address); //查詢滿足條件的所有用戶數 int selectTotalWithParam(String username, String email, String address); }
UserController.java
package com.shelbourne.schooldelivery.controller; import com.shelbourne.schooldelivery.entity.User; import com.shelbourne.schooldelivery.mapper.UserMapper; import com.shelbourne.schooldelivery.service.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.*; import java.util.HashMap; import java.util.List; import java.util.Map; @RequestMapping("/user") //統一給接口加前綴,postman后臺接口localhost:9090/user @RestController public class UserController { @Autowired //注入其他類的注解 private UserMapper userMapper; @Autowired private UserService userService; //查詢所有用戶 @GetMapping public List<User> findAll(String username) { return userMapper.findAll(); } //通過POST請求進行新增和更新操作 @PostMapping public Integer save(@RequestBody User user) {//一定要加上RequestBody,可以把前端傳回的JSON對象轉換為Java對象 return userService.save(user); } //刪除請求接口 @DeleteMapping("/{id}") public Integer delete(@PathVariable Integer id) {//這里的“id”必須和DeleteMapping里面的名字一樣 return userMapper.deleteById(id); } @GetMapping("/page") public Map<String, Object> findPage(@RequestParam Integer pageNum, @RequestParam Integer pageSize, @RequestParam String username, @RequestParam String email, @RequestParam String address) { int startIdx = (pageNum - 1) * pageSize, size = pageSize; List<User> data = userMapper.selectPageWithParam(startIdx, size, username, email, address);//獲取一頁的數據 int total = userMapper.selectTotalWithParam(username, email, address);//查詢總條數 Map<String, Object> res = new HashMap<>(); res.put("data", data);//表格數據 res.put("total", total);//分頁使用 return res; } }
Home.vue中:
<script> export default { data() { return { total: 0,//記錄條數為0 pageNum: 1,//默認從第一條記錄開始 pageSize: 10,//默認分頁大小為10 username: "",//條件查詢的姓名 email: "",//條件查詢的郵箱 address: "",//條件查詢的地址 } }, created() {//頁面渲染完成后的數據刷新 this.flushData() }, methods: { //獲取數據 flushData() { fetch("http://localhost:9090/user/page?pageNum=" + this.pageNum + "&pageSize=" + this.pageSize + "&username=" + this.username + "&email=" + this.email + "&address=" + this.address).then(res => res.json()).then(res => { // console.log(res) //跨域問題:前端端口8080,后端端口9090,導致跨域 this.tableData = res.data this.total = res.total }) } } } </script>
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