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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