springboot植入pagerHelper springboot植入pagerHelper的超详细教程
soft_z1302 人气:0简介
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
技术方案
maven jar导入
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 id="Mysql" 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
更多请查看官网分页使用方式
pageInfo = PageHelper.startPage(1, 10).doSelectPageInfo(() -> userMapper.selectGroupBy());,
总结&反思
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
源码地址
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