分页插件代码
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MyBatis Code

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13 分钟

pom.xml

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>top.qaqaq.mybatis</groupId>
  <artifactId>MyBatis_MBG</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>MyBatis_MBG</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>

    <!-- 依赖MyBatis核心包 -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.7</version>
    </dependency>

    <!-- junit测试 -->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>
    <!-- MySQL驱动 -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.31</version>
    </dependency>
    <!-- log4j日志 -->
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.17</version>
    </dependency>

    <dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>5.2.0</version>
    </dependency>

  </dependencies>

  <!-- 控制Maven在构建过程中相关配置 -->
  <build>
    <!-- 构建过程中用到的插件 -->
    <plugins>
      <!-- 具体插件，逆向工程的操作是以构建过程中插件形式出现的 -->
      <plugin>
        <groupId>org.mybatis.generator</groupId>
        <artifactId>mybatis-generator-maven-plugin</artifactId>
        <version>1.3.0</version>
        <!-- 插件的依赖 -->
        <dependencies>
          <!-- 逆向工程的核心依赖 -->
          <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.2</version>
          </dependency>
          <!-- 数据库连接池 -->
          <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.2</version>
          </dependency>
          <!-- MySQL驱动 -->
          <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.31</version>
          </dependency>
        </dependencies>
      </plugin>
    </plugins>
  </build>

</project>

resources

mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

    <properties resource="jdbc.properties"/>

    <typeAliases>
        <package name="top.qaqaq.mybatis.pojo"/>
    </typeAliases>

    <plugins>
        <!--设置分页插件-->
        <plugin interceptor="com.github.pagehelper.PageInterceptor"></plugin>
    </plugins>

    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}"/>
                <property name="url" value="${jdbc.url}"/>
                <property name="username" value="${jdbc.username}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>

    <mappers>
        <package name="top.qaqaq.mybatis.mapper"/>
    </mappers>
</configuration>

jdbc.properties

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis
jdbc.username=root
jdbc.password=123456

log4j.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
    <appender name="STDOUT" class="org.apache.log4j.ConsoleAppender">
        <param name="Encoding" value="UTF-8" />
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%-5p %d{MM-dd HH:mm:ss,SSS}%m (%F:%L) \n" />
        </layout>
    </appender>
    <logger name="java.sql">
        <level value="debug" />
    </logger>
    <logger name="org.apache.ibatis">
        <level value="info" />
    </logger>
    <root>
        <level value="debug" />
        <appender-ref ref="STDOUT" />
    </root>
</log4j:configuration>

generatorConfig.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
    <!--
            targetRuntime: 执行生成的逆向工程的版本
                    MyBatis3Simple: 生成基本的CRUD（清新简洁版）
                    MyBatis3: 生成带条件的CRUD（奢华尊享版）
    -->
    <context id="DB2Tables" targetRuntime="MyBatis3">
        <!-- 数据库的连接信息 -->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/mybatis"
                        userId="root"
                        password="123456">
        </jdbcConnection>
        <!-- javaBean的生成策略-->
        <javaModelGenerator targetPackage="top.qaqaq.mybatis.pojo" targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <!-- SQL映射文件的生成策略 -->
        <sqlMapGenerator targetPackage="top.qaqaq.mybatis.mapper" targetProject=".\src\main\resources">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>
        <!-- Mapper接口的生成策略 -->
        <javaClientGenerator type="XMLMAPPER" targetPackage="top.qaqaq.mybatis.mapper" targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>
        <!-- 逆向分析的表 -->
        <!-- tableName设置为*号，可以对应所有表，此时不写domainObjectName -->
        <!-- domainObjectName属性指定生成出来的实体类的类名 -->
        <table tableName="t_emp" domainObjectName="Emp"/>
        <table tableName="t_dept" domainObjectName="Dept"/>
    </context>
</generatorConfiguration>

resources/mapper

EmpMapper .xml（自动生成）

DeptMapper.xml（自动生成）

******************************************************************

mapper

EmpMapper .java（自动生成）

DeptMapper .java（自动生成）

******************************************************************

pojo

Emp .java（自动生成）

EmpExample.java（自动生成）

Dept.java（自动生成）

DeptExample.java（自动生成）

******************************************************************

test

PageHelperTest .java

package top.qaqaq.mybatis.test;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;
import top.qaqaq.mybatis.mapper.EmpMapper;
import top.qaqaq.mybatis.pojo.Emp;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;

public class PageHelperTest {

    /**
     * limit index,pageSize
     * index: 当前页的起始索引
     * pageSize: 每页显示的条数
     * pageNum: 当前页的页码
     * index=(pageNum-1)*pageSize
     *
     * 使用MyBatis的分页插件实现分页功能
     * 1、需要在查询功能之前开启分页
     * PageHelper.startPage(int pageNum, int pageSize);
     * 2、在查询功能之后获取分页相关信息
     * PageInfo<Emp> page = new PageInfo<>(list, 5);
     * list表示分页数据
     * 5表示当前导航分页的数量
     */

    @Test
    public void testPageHelper() {
        try {
            InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
            SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
            SqlSession sqlSession = sqlSessionFactory.openSession(true);
            EmpMapper mapper = sqlSession.getMapper(EmpMapper.class);
            //Page<Object> page = PageHelper.startPage(1, 4);
            PageHelper.startPage(1, 4);
            List<Emp> list = mapper.selectByExample(null);
            PageInfo<Emp> page = new PageInfo<>(list, 5);
            //list.forEach(emp -> System.out.println(emp));
            System.out.println(page);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}
MyBatis
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