springboot植入pagerHelper的超詳細教程
前面個已經講過mybatis的批量更新操作。批量操作還有時分頁查詢，針對項目的完善性，來講解一下分頁工具的植入pagerHelper和tk.mybatis使用。其實官網已經有具體代碼，代價有空可以多多參考官網操作。鏈接地址MyBatis-Spring-Boot
技術方案maven jar導入查看官方說明引入依賴，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依賴之后，配置plugin插件，插件時根據maven來識別的，可以直接拷貝官網的配置即可，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
根據自己喜歡，可以定制化配置generatorConfig.xml，下面是我個人基本配置，更多配置說明，請查看官方說明MyBatis Generator 詳解
<?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'/> <!-- 數據庫表 以及實體類命名 --> <!-- <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>測試樣例
點擊mybatis-generator:generate即可生成對象和映射文件，具體如上圖
一般分頁個人喜好建議用jdk8的lambda表達式，如：//對應的lambda用法pageInfo = PageHelper.startPage(1, 10).doSelectPageInfo(() -> userMapper.selectGroupBy());，更多請查看官網分頁使用方式
總結&反思基本操作對象，我們不要再手動一個一個的寫啦，直接用mybatis插件生成。基本curd不要再自己編寫xml，直接用tk.mysql操作即可。一對多情況，分頁無法實現謹慎使用
源碼地址github
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