springboot整合drui、mybatis、pagehelper

springboot配置数据连接池druid

Druid是阿里巴巴开发的号称为监控而生的数据库连接池，Druid是目前最好的数据库连接池。
在功能、性能、扩展性方面，都超过其他数据库连接池，同时加入了日志监控，
可以很好的监控DB池连接和SQL的执行情况

配置pom依赖

<dependency>
     <groupId>com.alibaba</groupId>
     <artifactId>druid-spring-boot-starter</artifactId>
     <version>1.1.10</version>
  </dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-aspects</artifactId>
</dependency>

application.yml配置druid

 1 spring:
 2   datasource:
 3     #1.JDBC
 4     type: com.alibaba.druid.pool.DruidDataSource
 5     driver-class-name: com.mysql.jdbc.Driver
 6     url: jdbc:mysql://localhost:3306/t224?useUnicode=true&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
 7     username: root
 8     password: 123
 9     druid:
10       #2.连接池配置
11       #初始化连接池的连接数量 大小，最小，最大
12       initial-size: 5
13       min-idle: 5
14       max-active: 20
15       #配置获取连接等待超时的时间
16       max-wait: 60000
17       #配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
18       time-between-eviction-runs-millis: 60000
19       # 配置一个连接在池中最小生存的时间，单位是毫秒
20       min-evictable-idle-time-millis: 30000
21       validation-query: SELECT 1 FROM DUAL
22       test-while-idle: true
23       test-on-borrow: true
24       test-on-return: false
25       # 是否缓存preparedStatement，也就是PSCache  官方建议MySQL下建议关闭   个人建议如果想用SQL防火墙 建议打开
26       pool-prepared-statements: true
27       max-pool-prepared-statement-per-connection-size: 20
28       # 配置监控统计拦截的filters，去掉后监控界面sql无法统计，‘wall‘用于防火墙
29       filter:
30         stat:
31           merge-sql: true
32           slow-sql-millis: 5000
33       #3.基础监控配置
34       web-stat-filter:
35         enabled: true
36         url-pattern: /*
37         #设置不统计哪些URL
38         exclusions: "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*"
39         session-stat-enable: true
40         session-stat-max-count: 100
41       stat-view-servlet:
42         enabled: true
43         url-pattern: /druid/*
44         reset-enable: true
45         #设置监控页面的登录名和密码
46         login-username: admin
47         login-password: admin
48         allow: 127.0.0.1
49         #deny: 192.168.1.100

启动SpringBoot项目访问druid

整合mybatis逆向生成

springboot整合mybatis逆向生成插件

导入pom依赖

<!--更改springboot中的mysql版本，逆向生成不兼容高版本-->
<mysql.version>5.1.44</mysql.version>

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>${mysql.version}</version>
    <scope>runtime</scope>
</dependency>

<resources>
    <!--解决mybatis-generator-maven-plugin运行时没有将XxxMapper.xml文件放入target文件夹的问题-->
    <resource>
        <directory>src/main/java</directory>
        <includes>
            <include>**/*.xml</include>
        </includes>
    </resource>
    <!--解决mybatis-generator-maven-plugin运行时没有将jdbc.properites文件放入target文件夹的问题-->
    <resource>
        <directory>src/main/resources</directory>
        <includes>
            <include>*.properties</include>
            <include>*.xml</include>
            <include>*.yml</include>
        </includes>
    </resource>
</resources>

<plugin>
    <groupId>org.mybatis.generator</groupId>
    <artifactId>mybatis-generator-maven-plugin</artifactId>
    <version>1.3.2</version>
    <dependencies>
        <!--使用Mybatis-generator插件不能使用太高版本的mysql驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
        </dependency>
    </dependencies>
    <configuration>
        <overwrite>true</overwrite>
    </configuration>
</plugin>

逆向生成配置文件generatorConfig.xml

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
 3         "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd" >
 4 <generatorConfiguration>
 5     <!-- 引入配置文件 -->
 6     <properties resource="jdbc.properties"/>
 7
 8     <!--指定数据库jdbc驱动jar包的位置-->
 9     <classPathEntry location="D:\\ka\\mvn_repository\\mysql\\mysql-connector-java\\5.1.44\\mysql-connector-java-5.1.44.jar"/>
10
11
12     <!-- 一个数据库一个context -->
13     <context id="infoGuardian">
14         <!-- 注释 -->
15         <commentGenerator>
16             <property name="suppressAllComments" value="true"/><!-- 是否取消注释 -->
17             <property name="suppressDate" value="true"/> <!-- 是否生成注释代时间戳 -->
18         </commentGenerator>
19
20         <!-- jdbc连接 -->
21         <jdbcConnection driverClass="${jdbc.driver}"
22                         connectionURL="${jdbc.url}" userId="${jdbc.username}" password="${jdbc.password}"/>
23
24         <!-- 类型转换 -->
25         <javaTypeResolver>
26             <!-- 是否使用bigDecimal， false可自动转化以下类型（Long, Integer, Short, etc.） -->
27             <property name="forceBigDecimals" value="false"/>
28         </javaTypeResolver>
29
30         <!-- 01 指定javaBean生成的位置 -->
31         <!-- targetPackage：指定生成的model生成所在的包名 -->
32         <!-- targetProject：指定在该项目下所在的路径  -->
33         <javaModelGenerator targetPackage="com.cjh.springboot02.model"
34                             targetProject="src/main/java">
35             <!-- 是否允许子包，即targetPackage.schemaName.tableName -->
36             <property name="enableSubPackages" value="false"/>
37             <!-- 是否对model添加构造函数 -->
38             <property name="constructorBased" value="true"/>
39             <!-- 是否针对string类型的字段在set的时候进行trim调用 -->
40             <property name="trimStrings" value="false"/>
41             <!-- 建立的Model对象是否 不可改变  即生成的Model对象不会有 setter方法，只有构造方法 -->
42             <property name="immutable" value="false"/>
43         </javaModelGenerator>
44
45         <!-- 02 指定sql映射文件生成的位置 -->
46         <sqlMapGenerator targetPackage="com.cjh.springboot02.mapper"
47                          targetProject="src/main/java">
48             <!-- 是否允许子包，即targetPackage.schemaName.tableName -->
49             <property name="enableSubPackages" value="false"/>
50         </sqlMapGenerator>
51
52         <!-- 03 生成XxxMapper接口 -->
53         <!-- type="ANNOTATEDMAPPER",生成Java Model 和基于注解的Mapper对象 -->
54         <!-- type="MIXEDMAPPER",生成基于注解的Java Model 和相应的Mapper对象 -->
55         <!-- type="XMLMAPPER",生成SQLMap XML文件和独立的Mapper接口 -->
56         <javaClientGenerator targetPackage="com.cjh.springboot02.mapper"
57                              targetProject="src/main/java" type="XMLMAPPER">
58             <!-- 是否在当前路径下新加一层schema,false路径com.oop.eksp.user.model， true:com.oop.eksp.user.model.[schemaName] -->
59             <property name="enableSubPackages" value="false"/>
60         </javaClientGenerator>
61
62         <!-- 配置表信息 -->
63         <!-- schema即为数据库名 -->
64         <!-- tableName为对应的数据库表 -->
65         <!-- domainObjectName是要生成的实体类 -->
66         <!-- enable*ByExample是否生成 example类 -->
67         <!--<table schema="" tableName="t_book" domainObjectName="Book"-->
68         <!--enableCountByExample="false" enableDeleteByExample="false"-->
69         <!--enableSelectByExample="false" enableUpdateByExample="false">-->
70         <!--&lt;!&ndash; 忽略列，不生成bean 字段 &ndash;&gt;-->
71         <!--&lt;!&ndash; <ignoreColumn column="FRED" /> &ndash;&gt;-->
72         <!--&lt;!&ndash; 指定列的java数据类型 &ndash;&gt;-->
73         <!--&lt;!&ndash; <columnOverride column="LONG_VARCHAR_FIELD" jdbcType="VARCHAR" /> &ndash;&gt;-->
74         <!--</table>-->
75
76         <table schema="" tableName="t_mvc_book" domainObjectName="Book"
77                enableCountByExample="false" enableDeleteByExample="false"
78                enableSelectByExample="false" enableUpdateByExample="false">
79             <property name="useActualColumnNames" value="true" />
80         </table>
81
82
83
84     </context>
85 </generatorConfiguration>

逆向生成集成到maven中的命令

1 mybatis-generator:generate -e

在启动类中添加注解，用于扫描Mapper类的包。扫描多个包：

1 @MapperScan("com.cjh.springboot02.mapper")

启动事务管理

1 @EnableTransactionManagement

动态代理

1 @SpringBootApplication

测试代码：

 1 package com.cjh.springboot02;
 2
 3 import com.cjh.springboot02.model.Book;
 4 import com.cjh.springboot02.service.BookService;
 5 import com.cjh.springboot02.utils.PageBean;
 6 import org.junit.jupiter.api.Test;
 7 import org.springframework.beans.factory.annotation.Autowired;
 8 import org.springframework.boot.test.context.SpringBootTest;
 9
10 import java.util.HashMap;
11 import java.util.List;
12 import java.util.Map;
13
14 @SpringBootTest
15 class Springboot02ApplicationTests {
16     @Autowired
17     private BookService bookService;
18
19     @Test
20   public void deleteByPrimaryKey(){
21     bookService.deleteByPrimaryKey(27);
22     }
23
24     @Test
25     public void selectByPrimaryKey(){
26         Book book = bookService.selectByPrimaryKey(27);
27         System.out.println(book);
28
29     }
30 }

整合pagehelper

pom依赖：

1 <dependency>
2             <groupId>com.github.pagehelper</groupId>
3             <artifactId>pagehelper-spring-boot-starter</artifactId>
4             <version>1.2.3</version>
5         </dependency>

配置application.yml文件

 1 #pagehelper分页插件配置
 2 pagehelper:
 3   helperDialect: mysql
 4   reasonable: true
 5   supportMethodsArguments: true
 6   params: count=countSql
 7
 8 #显示日志
 9 logging:
10   level:
11     com.javaxl.springboot02.mapper: debug

工具类pageBean

package com.cjh.springboot02.utils;

import javax.servlet.http.HttpServletRequest;
import java.io.Serializable;
import java.util.Map;

public class PageBean implements Serializable {

    private static final long serialVersionUID = 2422581023658455731L;

    //页码
    private int page=1;
    //每页显示记录数
    private int rows=10;
    //总记录数
    private int total=0;
    //是否分页
    private boolean isPagination=true;
    //上一次的请求路径
    private String url;
    //获取所有的请求参数
    private Map<String,String[]> map;

    public PageBean() {
        super();
    }

    //设置请求参数
    public void setRequest(HttpServletRequest req) {
        String page=req.getParameter("page");
        String rows=req.getParameter("rows");
        String pagination=req.getParameter("pagination");
        this.setPage(page);
        this.setRows(rows);
        this.setPagination(pagination);
        this.url=req.getContextPath()+req.getServletPath();
        this.map=req.getParameterMap();
    }
    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public Map<String, String[]> getMap() {
        return map;
    }

    public void setMap(Map<String, String[]> map) {
        this.map = map;
    }

    public int getPage() {
        return page;
    }

    public void setPage(int page) {
        this.page = page;
    }

    public void setPage(String page) {
        if(null!=page&&!"".equals(page.trim()))
            this.page = Integer.parseInt(page);
    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
        this.rows = rows;
    }

    public void setRows(String rows) {
        if(null!=rows&&!"".equals(rows.trim()))
            this.rows = Integer.parseInt(rows);
    }

    public int getTotal() {
        return total;
    }

    public void setTotal(int total) {
        this.total = total;
    }

    public void setTotal(String total) {
        this.total = Integer.parseInt(total);
    }

    public boolean isPagination() {
        return isPagination;
    }

    public void setPagination(boolean isPagination) {
        this.isPagination = isPagination;
    }

    public void setPagination(String isPagination) {
        if(null!=isPagination&&!"".equals(isPagination.trim()))
            this.isPagination = Boolean.parseBoolean(isPagination);
    }

    /**
     * 获取分页起始标记位置
     * @return
     */
    public int getStartIndex() {
        //(当前页码-1)*显示记录数
        return (this.getPage()-1)*this.rows;
    }

    /**
     * 末页
     * @return
     */
    public int getMaxPage() {
        int totalpage=this.total/this.rows;
        if(this.total%this.rows!=0)
            totalpage++;
        return totalpage;
    }

    /**
     * 下一页
     * @return
     */
    public int getNextPage() {
        int nextPage=this.page+1;
        if(this.page>=this.getMaxPage())
            nextPage=this.getMaxPage();
        return nextPage;
    }

    /**
     * 上一页
     * @return
     */
    public int getPreivousPage() {
        int previousPage=this.page-1;
        if(previousPage<1)
            previousPage=1;
        return previousPage;
    }

    @Override
    public String toString() {
        return "PageBean [page=" + page + ", rows=" + rows + ", total=" + total + ", isPagination=" + isPagination
                + "]";
    }
}

切面pagerAspect

package com.cjh.springboot02.aspect;

import com.cjh.springboot02.utils.PageBean;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;

import java.util.List;

@Component
@Aspect
public class PagerAspect {

    @Around("execution(* *..*Service.*Pager(..))")
    public Object invoke(ProceedingJoinPoint args) throws Throwable {
        Object[] params = args.getArgs();
        PageBean pageBean = null;
        for (Object param : params) {
            if (param instanceof PageBean) {
                pageBean = (PageBean) param;
                break;
            }
        }

        if (pageBean != null && pageBean.isPagination())
            PageHelper.startPage(pageBean.getPage(), pageBean.getRows());

        Object proceed = args.proceed(params);

        if (pageBean != null && pageBean.isPagination()) {
            PageInfo pageInfo = new PageInfo((List) proceed);
            pageBean.setTotal(pageInfo.getTotal() + "");
        }
        return proceed;
    }
}

分页查询sql:

  <select id="bookPager" resultType="java.util.Map" parameterType="java.util.Map">
    select * from t_mvc_book
    <where>
    <if test="bname != null">
      and bname like concat(‘%‘,#{bname},‘%‘)

    </if>

    </where>

测试：

    @Test
    public void bookPager(){
        Map map =  new HashMap();
        map.put("bname","圣墟");
        PageBean pageBean = new PageBean();
        pageBean.setPage(2);
        List<Map> maps = bookService.bookPager(map, pageBean);
        for (Map m : maps) {
            System.out.println(m);

        }
        System.out.println(pageBean);
    }

结果：

原文地址：https://www.cnblogs.com/chenjiahao9527/p/11829178.html