springboot植入pagerHelper的超详细教程

前面个已经讲过mybatis的批量更新操作。批量操作还有时分页查询，针对项目的完善性，来讲解一下分页工具的植入pagerHelper和tk.mybatis使用。其实官网已经有具体代码，代价有空可以多多参考官网操作。链接地址MyBatis-Spring-Boot

查看官方说明引入依赖，如下：

<!--mybatis--><dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.1</version></dependency><!--mapper--><dependency> <groupId>tk.mybatis</groupId> <artifactId>mapper-spring-boot-starter</artifactId> <version>1.2.4</version></dependency><!--pagehelper--><dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper-spring-boot-starter</artifactId> <version>1.2.3</version></dependency>maven plugin配置

引入完jar依赖之后，配置plugin插件，插件时根据maven来识别的，可以直接拷贝官网的配置即可，如下：

<plugin><groupId>org.mybatis.generator</groupId><artifactId>mybatis-generator-maven-plugin</artifactId><version>1.3.2</version><configuration> <configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile> <overwrite>true</overwrite> <verbose>true</verbose></configuration><dependencies> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>${mysql.version}</version> </dependency> <dependency> <groupId>tk.mybatis</groupId> <artifactId>mapper-generator</artifactId> <version>1.0.0</version> </dependency></dependencies> </plugin>配置generatorConfig.xml

根据自己喜欢，可以定制化配置generatorConfig.xml，下面是我个人基本配置，更多配置说明，请查看官方说明MyBatis Generator 详解

<?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> <properties resource='generator/application-dev.properties'/> <context targetRuntime='MyBatis3Simple' defaultModelType='flat'> <property name='beginningDelimiter' value='`'/> <property name='endingDelimiter' value='`'/> <plugin type='tk.mybatis.mapper.generator.MapperPlugin'> <property name='mappers' value='com.lgh.common.util.MyMapper'/> </plugin> <jdbcConnection driverClass='${spring.datasource.driver-class-name}' connectionURL='${spring.datasource.url}' userId='${spring.datasource.username}' password='${spring.datasource.password}'> </jdbcConnection> <javaModelGenerator targetPackage='com.lgh.model' targetProject='src/main/java'/> <sqlMapGenerator targetPackage='mapper' targetProject='src/main/resources'/> <javaClientGenerator targetPackage='com.lgh.mapper' targetProject='src/main/java' type='XMLMAPPER'/> <!-- 数据库表 以及实体类命名 --> <!-- <table schema='CL_DEMO' tableName='tb_user' domainObjectName='User'enableCountByExample='false' enableDeleteByExample='false'enableSelectByExample='false' enableUpdateByExample='false'selectByExampleQueryId='false' /> <table schema='CL_DEMO' tableName='tb_role' domainObjectName='Role'enableCountByExample='false' enableDeleteByExample='false'enableSelectByExample='false' enableUpdateByExample='false'selectByExampleQueryId='false' /> <table schema='CL_DEMO' tableName='tb_menu' domainObjectName='Menu'enableCountByExample='false' enableDeleteByExample='false'enableSelectByExample='false' enableUpdateByExample='false'selectByExampleQueryId='false' /> <table schema='CL_DEMO' tableName='tb_resource' domainObjectName='Resource'enableCountByExample='false' enableDeleteByExample='false'enableSelectByExample='false' enableUpdateByExample='false'selectByExampleQueryId='false' /> <table schema='CL_DEMO' tableName='user_role' domainObjectName='UserRole'enableCountByExample='false' enableDeleteByExample='false'enableSelectByExample='false' enableUpdateByExample='false'selectByExampleQueryId='false' /> <table schema='CL_DEMO' tableName='role_menu' domainObjectName='RoleMenu'enableCountByExample='false' enableDeleteByExample='false'enableSelectByExample='false' enableUpdateByExample='false'selectByExampleQueryId='false' /> <table schema='CL_DEMO' tableName='menu_resource' domainObjectName='MenuResource'enableCountByExample='false' enableDeleteByExample='false'enableSelectByExample='false' enableUpdateByExample='false'selectByExampleQueryId='false' /> <table schema='CL_DEMO' tableName='role_resource' domainObjectName='RoleResource'enableCountByExample='false' enableDeleteByExample='false'enableSelectByExample='false' enableUpdateByExample='false'selectByExampleQueryId='false' /> <table schema='CL_DEMO' tableName='logon' domainObjectName='Logon'enableCountByExample='false' enableDeleteByExample='false'enableSelectByExample='false' enableUpdateByExample='false'selectByExampleQueryId='false' />--> </context></generatorConfiguration>测试样例

点击mybatis-generator:generate即可生成对象和映射文件，具体如上图

一般分页个人喜好建议用jdk8的lambda表达式，如：//对应的lambda用法pageInfo = PageHelper.startPage(1, 10).doSelectPageInfo(() -> userMapper.selectGroupBy());，更多请查看官网分页使用方式

基本操作对象，我们不要再手动一个一个的写啦，直接用mybatis插件生成。基本curd不要再自己编写xml，直接用tk.mysql操作即可。一对多情况，分页无法实现谨慎使用

github

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