project demo2

描述：mybatis的逆向工程的生成，pagehelper插件分页
demo

image.png

版本：

mysql 8.0.12
springboot 2.0.6.RELEASE
其它 pom.xml文件中可见版本

pom.xml

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

    <groupId>com.inverseli</groupId>
    <artifactId>test</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>test</name>
    <description>Demo project for Spring Cloud</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!--pagehelper -->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.3</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.10</version>
        </dependency>
        <!-- SpringBoot - MyBatis 逆向工程 -->
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.5</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.0.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <!-- mybatis和spring整合 -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>
        <!-- 热部署工具 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <!--  mysql数据库驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.12</version>
        </dependency>
        <!-- lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <!-- test -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <!-- generator插件工具-->
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.2</version>
                <configuration>
                    <verbose>true</verbose>
                    <overwrite>true</overwrite>
                </configuration>
                <!-- 插件依赖的jar包 -->
                <dependencies>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>8.0.12</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>
</project>

引入依赖

pagehelper

       <!--pagehelper -->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.3</version>
        </dependency>

SpringBoot - MyBatis 逆向工程

        <!-- SpringBoot - MyBatis 逆向工程 -->
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.5</version>
        </dependency>

generator 插件

            <plugin>
                <!-- generator插件工具-->
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.2</version>
                <configuration>
                    <verbose>true</verbose>
                    <overwrite>true</overwrite>
                </configuration>
                <!-- 插件依赖的jar包 -->
                <dependencies>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>8.0.12</version>
                    </dependency>
                </dependencies>
            </plugin>

generatorConfig.xml

根据这个文件中的内容逆向生成文件，该文件中的标签要注意顺序问题

<?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>
    <classPathEntry  location="C:\Users\liyuhao\.m2\repository\mysql\mysql-connector-java\5.1.35\mysql-connector-java-5.1.35.jar"/>
    <context id="caigouTables" targetRuntime="MyBatis3">
        <commentGenerator>
            <!-- 是否去除自动生成的注释 true：是 ： false:否 -->
            <property name="suppressAllComments" value="true" />
        </commentGenerator>

        <jdbcConnection
                driverClass="com.mysql.cj.jdbc.Driver"
                connectionURL="jdbc:mysql://127.0.0.1:3306/vipyiwei_sharedrestaurant?serverTimezone=GMT%2B8"
                userId="root"
                password="etoak">
        </jdbcConnection>

        <!-- 默认false，把JDBC DECIMAL 和 NUMERIC 类型解析为 Integer true，把JDBC DECIMAL 和
            NUMERIC 类型解析为java.math.BigDecimal -->
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>

        <!-- targetProject:生成PO类的位置 -->
        <javaModelGenerator targetPackage="com.inverseli.test.pojo"
                            targetProject=".\src\main\java">
            <!-- enableSubPackages:是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="false" />
            <!-- 从数据库返回的值被清理前后的空格 -->
            <property name="trimStrings" value="true" />
        </javaModelGenerator>
        <!-- targetPackage:mapper映射文件生成的位置 在resources文件夹下
        <sqlMapGenerator targetPackage="mapping"
                         targetProject=".\src\main\resources">
            <property name="enableSubPackages" value="false" />
        </sqlMapGenerator>-->
        <!-- targetPackage:mapper映射文件生成的位置 -->
        <sqlMapGenerator targetPackage="com.inverseli.test.mapping"
                         targetProject=".\src\main\java">
            <property name="enableSubPackages" value="false" />
        </sqlMapGenerator>
        <!-- targetPackage：mapper接口的生成位置 -->
        <javaClientGenerator type="XMLMAPPER"
                             targetPackage="com.inverseli.test.dao"
                             targetProject=".\src\main\java">
            <property name="enableSubPackages" value="false" />
        </javaClientGenerator>

        <table schema="vipyiwei_sharedrestaurant" tableName="admin_roles" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false"
               enableSelectByExample="false" selectByExampleQueryId="false">
        </table>
        <table schema="vipyiwei_sharedrestaurant" tableName="admin_users" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false"
               enableSelectByExample="false" selectByExampleQueryId="false">
        </table>
    </context>
</generatorConfiguration>

maven插件命令

edit configurations->maven命令

image.png

mybatis-generator:generate -e

PageHelper的java方式配置

package com.inverseli.test.config;

import com.github.pagehelper.PageHelper;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.Properties;

@Configuration
public class MybatisConf {

    // config
    @Bean
    public PageHelper pageHelper() {
        PageHelper pageHelper = new PageHelper();
        Properties p = new Properties();
        p.setProperty("offsetAsPageNum", "true");
        p.setProperty("rowBoundsWithCount", "true");
        p.setProperty("reasonable", "true");
        pageHelper.setProperties(p);
        return pageHelper;
    }
}

Controller

package com.inverseli.test.controller;

import com.github.pagehelper.PageHelper;
import com.inverseli.test.dao.AdminRolesMapper;
import com.inverseli.test.dao.AdminUsersMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;

@RestController
public class UserController {

    @Autowired
    private AdminUsersMapper adminUsersMapper;

    @Autowired
    private AdminRolesMapper adminRolesMapper;

    @GetMapping("/selectAllUserInfo")
    public List<Object> selectAllUserInfo() {
        PageHelper.startPage(1,3);
        return adminUsersMapper.selectAll();
    }
        
    /**
     * @Author liyuhao
     * @Description
     * @Date 15:38 2018/10/26
     * @Param [pageSize]
     * @Return [pageSize]
     **/
    @GetMapping("/selectAllRoleInfo")
    public List<Object> selectAllRoleInfo(@RequestParam int page) {
        int offset; // 起始位置
        // 每页的显示数目
        int pageSize = 5;
        // 总数量
        int allSize = adminRolesMapper.selectCount();
        // 总共的页数
        int pageNum = allSize / pageSize;
        // PageHelper.startPage(pageNum,pageSize);
        if (page==1) {
            offset = 0;
        } else {
            offset = (page - 1) * pageSize;
        }
        PageHelper.offsetPage(offset,pageSize);
        return adminRolesMapper.selectAllRoles();
    }
}

demo problems

plugin插件中需要添加需要的jar依赖？？
generatorConfig.xml位置的扫描，如果generatorConfig.xml不在默认的resource文件夹下，会报错。
mysql版本太高出现问题（解决方案如下）
- 改pom.xml中maven依赖，改为高版本8.0.12
- 更改驱动 com.mysql.cj.jdbc.Driver
- 更改url-- jdbc:mysql://127.0.0.1:3306/vipyiwei_sharedrestaurant?useUnicode=true&characterEncoding=utf-8&characterSetResults=utf8&serverTimezone=GMT%2B8&amp&useSSL=false
- 主要是这个serverTimezone=GMT%2B8&amp&useSSL=false

project demo2

版本：

pom.xml

引入依赖

generatorConfig.xml

maven插件命令

PageHelper的java方式配置

Controller

demo problems

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