前言：使用pagehelper插件。它非常的方便，自動拼接mapper.xml配置裏的對應的sql語句，也就是說不用我們去修改或新增mapper.xml裏的sql語句配置，直接使用原來的查詢所有的sql語句就行了，只會查詢頁面當前顯示的頁數的數據。
1、配置pom.xml---文件導入jar
有關mysql，dbcp，mybatis，spring-boot-starter-web相關的jar包
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.dyt.server</groupId>
<artifactId>dataServer</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>dataServer</name>
<description>數據監測服務</description>
<properties>
<java.version>1.8</java.version>
<fastjson.version>1.2.44</fastjson.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.2</version>
</dependency>
<!-- 熱部署 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
<!-- 分頁插件 -->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.2.5</version>
</dependency>
<!--阿里巴巴druid數據庫連接池 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.10</version>
</dependency>
<dependency>
<groupId>com.oracle.ojdbc</groupId>
<artifactId>ojdbc8</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>${fastjson.version}</version>
</dependency>
<dependency>
<groupId>cn.easyproject</groupId>
<artifactId>orai18n</artifactId>
<version>12.1.0.2.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
2、配置application.properties
application.properties文件中配置mybatis的mapper文件位置，實體類的包路徑，還有最好加上駝峯命名規範，如果單獨配置了mybatis的配置文件，在application.properties中不能在同時寫入mybatis的配置
#端口
server.port=8091
#數據庫相關配置
spring.datasource.url=jdbc:oracle:thin:@**.**.**.**:1521:ky
spring.datasource.driver-class-name=oracle.jdbc.driver.OracleDriver
spring.datasource.username=root
spring.datasource.password=root
####mybatis配置
# 這種方式需要自己在resources目錄下創建mapper目錄然後存放xml
mybatis.mapper-locations=classpath:/mapper/*.xml
#mybatis.config-location=classpath:/mybatis/mybatis-config.xml
# 指定POJO掃描包來讓mybatis自動掃描到自定義POJO
mybatis.type-aliases-package=com.ykx.transinfo.model
# 駝峯命名規範 如：數據庫字段是 order_id 那麼 實體字段就要寫成 orderId
mybatis.configuration.map-underscore-to-camel-case=true
# 這個配置會將執行的sql打印出來，在開發或測試的時候可以用
mybatis.configuration.log-impl= org.apache.ibatis.logging.stdout.StdOutImpl
3、在springboot 主入口添加註解，裏面值爲Mapper對應的Java接口類
備註：@SpringBootApplication表示自動裝配；
可以將你的pageHelper配置寫在入口類裏邊，也可以像這樣寫到帶有@Configuration的配置類中
注意：所有的類要寫在main方法所在的類的包下，或者子包下，不然不能掃描；
package com.ykx.transinfo;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan("com.ykx.transinfo.mapper")
public class DataServerApplication {
public static void main(String[] args) {
SpringApplication.run(DataServerApplication.class, args);
}
}
配置類
/**
* Copyright © 2020 eSunny Info. Tech Ltd. All rights reserved.
* 功能描述：
* @Title: PageHelperConfig.java
* @Package com.ykx.transinfo.util
* @Description: TODO
* @author Administrator
* @date 2020年3月30日 上午11:34:22
* @version
*/
package com.ykx.transinfo.util;
/**
* 類名稱：PageHelperConfig
* 類描述：
* 創建人：Administrator
* 創建時間：2020年3月30日 上午11:34:22
* 修改人：Administrator
* 修改時間：2020年3月30日 上午11:34:22
* 修改備註：
* @version
*/
import com.github.pagehelper.PageHelper;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.util.Properties;
@Configuration//將該類加到spring容器裏
public class PageHelperConfig {
@Bean//加上該註解spring容器自動配置
public PageHelper pageHelper() {
PageHelper pageHelper = new PageHelper();
Properties properties = new Properties();
properties.setProperty("offsetAsPageNum", "true");
properties.setProperty("rowBoundsWithCount", "true");
properties.setProperty("reasonable", "true");
//配置mysql數據庫的方言
properties.setProperty("dialect","mysql");
// 表示支持從接口中讀取pageNum和pageSize
properties.setProperty("supportMethodsArguments", "true");
pageHelper.setProperties(properties);
return pageHelper;
}
}
4、持久化接口
@Repository
public interface TicketRealnameMapper {
// 有多個參數時，需要使用@Param來指定參數，否則查詢報錯
List<TicketRealname> selectUserByCustCerNo(@Param("custCerNo") String custCerNo,@Param("pageNum")int pageNum, @Param("pageSize")int pageSize);
// 有多個參數時，需要使用@Param來指定參數，否則查詢報錯
List<TicketRealname> selectUserByCustName(@Param("custName") String custName);
}
5.mapper文件配置
resultType：返回值類型，使用resultType進行輸出映射，只有查詢出來的列名和pojo中的屬性名一致，該列纔可以映射成功。
resultMap：如果查詢出來的列名和pojo的屬性名不一致，通過定義一個resultMap對列名和pojo屬性名之間作一個映射關係。
<?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.ykx.transinfo.mapper.TicketRealnameMapper">
<!-- 根據證件號碼查詢 -->
<select id="selectUserByCustCerNo" parameterType="java.lang.String" resultType="com.ykx.transinfo.model.TicketRealname">
SELECT *
FROM CZJY.TICKET_REALNAME
WHERE 1 = 1
<if test="custCerNo != null and custCerNo !=''">
AND CUST_CERNO = #{custCerNo,jdbcType=VARCHAR}
</if>
ORDER BY LINER_DATE
</select>
<!-- 根據證件號碼查詢 -->
<select id="selectUserByCustName" parameterType="java.lang.String" resultType="com.ykx.transinfo.model.TicketRealname">
SELECT *
FROM CZJY.TICKET_REALNAME
WHERE 1 = 1
<if test="custName != null and custName !=''">
AND CUST_NAME = #{custName,jdbcType=VARCHAR}
</if>
ORDER BY LINER_DATE
</select>
</mapper>
6、service層
public interface TicketRealnameService {
public List<TicketRealname> selectUserByCustCerNo(String custCerNo,int pageNum, int pageSize);
public List<TicketRealname> selectUserByCustName(String custCerName);
}
7、service實現
@Service
public class TicketRealnameServiceImp implements TicketRealnameService{
@Autowired
public TicketRealnameMapper realnameMapper;
/**
* @see com.ykx.transinfo.service.TicketRealnameService#findAllUser(java.lang.String, int, int)
* @Function: TicketServiceImp.java
* @Description: 該函數的功能描述
*
* @param:描述1描述
* @return：返回結果描述
* @throws：異常描述
*
* @version: v1.0.0
* @author: Administrator
* @date: 2020年3月30日 上午10:36:06
*
* Modification History:
* Date Author Version Description
*---------------------------------------------------------*
* 2020年3月30日 Administrator v1.0.0 修改原因
*/
@SuppressWarnings({ "null" })
public List<TicketRealname> selectUserByCustCerNo(String custCerNo, int pageNum, int pageSize) {
return realnameMapper.selectUserByCustCerNo(custCerNo,pageNum,pageSize);
}
/**
* @see com.ykx.transinfo.service.TicketRealnameService#selectUserByCustName(java.lang.String)
* @Function: TicketRealnameServiceImp.java
* @Description: 該函數的功能描述
*
* @param:描述1描述
* @return：返回結果描述
* @throws：異常描述
*
* @version: v1.0.0
* @author: Administrator
* @date: 2020年3月30日 下午4:21:24
*
* Modification History:
* Date Author Version Description
*---------------------------------------------------------*
* 2020年3月30日 Administrator v1.0.0 修改原因
*/
@Override
public List<TicketRealname> selectUserByCustName(String custName) {
// TODO Auto-generated method stub
return realnameMapper.selectUserByCustName(custName);
}
}
8、Controller層
@RestController
public class TicketRealnameController {
@Autowired
private TicketRealnameService service;
@PostMapping("/find")
public Object selectUserByCustCerNo(
@RequestParam(value = "custCerNo", required = false, defaultValue = "500221114615")String custCerNo,
@RequestParam(name = "pageNum", required = false, defaultValue = "1")int pageNum,
@RequestParam(name = "pageSize", required = false, defaultValue = "10")int pageSize){
JSONObject map = new JSONObject();//創建JSONmap來存放JSON數據傳到前臺
PageHelper.startPage(pageNum, pageSize);//設置數據庫分頁查詢的範圍
try {
// 這裏的custCerNo是指按證件號碼查詢，pageNum是指：頁數 ，pageSize是指每頁展示的數據
List<TicketRealname> realnames = service.selectUserByCustCerNo(custCerNo,pageNum,pageSize);
PageInfo<TicketRealname> pageInfo=new PageInfo<>(realnames);
map.put("count",pageInfo.getTotal());//獲取查詢總條數，這裏我會在後面解釋
map.put("data", realnames);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return map;
}
@PostMapping("/name")
public Object selectUserByName(
@RequestParam(name = "custName", required = false, defaultValue = "10")String custName){
List<TicketRealname> realnames = null;
try {
// 這裏的custCerNo是指按證件號碼查詢，1是指：頁數 ，2是指每頁展示的數據
realnames = service.selectUserByCustName(custName);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return realnames;
}
}
9、數據庫實體類
推薦引入lombok,少去寫get、set的麻煩，
/**
* Copyright © 2020 eSunny Info. Tech Ltd. All rights reserved.
* 功能描述：
* @Title: TicketRealname.java
* @Package com.ykx.transinfo.model
* @Description: TODO
* @author Administrator
* @date 2020年3月27日 下午4:33:03
* @version
*/
package com.ykx.transinfo.model;
import java.io.Serializable;
import lombok.Data;
/**
* 類名稱：TicketRealname
* 類描述：
* 創建人：Administrator
* 創建時間：2020年3月27日 下午4:33:03
* 修改人：Administrator
* 修改時間：2020年3月27日 下午4:33:03
* 修改備註：
* @version
*/
@Data
public class TicketRealname implements Serializable{
private static final long serialVersionUID = 1L;
private String realnameSeq = "";
private String linerDate = "";
private String ticketSeq = "";
private String telephone = "";
private String custName = "";
private String custCertype = "";
private String custCerno = "";
private String address = "";
private String remark = "";
private String lastupdateTime = "";
}
10、項目結構圖
11、測試
