在gradle中使用MyBatis Generator生成model,dao,mapper

Mybatis Generator是一个mybatis工具项目，用于生成mybatis的model,mapper,dao持久层代码。Mybatis Generator提供了maven plugin,ant target，java三种方式启动。现在主流的构建工具是gradle,虽然mybatis generator没有提供gradle的插件，但gradle可以调用ant任务，因此，gradle也能启动Mybatis Generator。

环境说明

• 数据库:mysql
• 数据库配置文件:src/main/resources/db-mysql.properties
• 项目中使用了mybatistk.mybatis:mapper:3.3.2插件

配置依赖

在build.gradle中:
运行ant需要运行环境，也就是相应的jar包，因此添加一个配置

configurations {    mybatisGenerator}

给这个配置添加依赖

repositories {    mavenCentral()}dependencies {    mybatisGenerator 'org.mybatis.generator:mybatis-generator-core:1.3.2'    mybatisGenerator 'mysql:mysql-connector-java:5.1.36'    mybatisGenerator 'tk.mybatis:mapper:3.3.2'}

配置task

在build.gradle中，定义一个task，在task里面调用ant

def getDbProperties = {    def properties = new Properties()    file("src/main/resources/db-mysql.properties").withInputStream { inputStream ->        properties.load(inputStream)    }    properties;}task mybatisGenerate << {    def properties = getDbProperties()    ant.properties['targetProject'] = projectDir.path    ant.properties['driverClass'] = properties.getProperty("jdbc.driverClassName")    ant.properties['connectionURL'] = properties.getProperty("jdbc.url")    ant.properties['userId'] = properties.getProperty("jdbc.user")    ant.properties['password'] = properties.getProperty("jdbc.pass")    ant.properties['src_main_java'] = sourceSets.main.java.srcDirs[0].path    ant.properties['src_main_resources'] = sourceSets.main.resources.srcDirs[0].path    ant.properties['modelPackage'] = this.modelPackage    ant.properties['mapperPackage'] = this.mapperPackage    ant.properties['sqlMapperPackage'] = this.sqlMapperPackage    ant.taskdef(            name: 'mbgenerator',            classname: 'org.mybatis.generator.ant.GeneratorAntTask',            classpath: configurations.mybatisGenerator.asPath    )    ant.mbgenerator(overwrite: true,            configfile: 'db/generatorConfig.xml', verbose: true) {        propertyset {            propertyref(name: 'targetProject')            propertyref(name: 'userId')            propertyref(name: 'driverClass')            propertyref(name: 'connectionURL')            propertyref(name: 'password')            propertyref(name: 'src_main_java')            propertyref(name: 'src_main_resources')            propertyref(name: 'modelPackage')            propertyref(name: 'mapperPackage')            propertyref(name: 'sqlMapperPackage')        }    }}

大致思路是:

• 从db-mysql.propertis读取配置
• 把配置注入ant任务
• 运行ant,生成文件

数据库配置文件，文件在src/main/resources/db-mysql.properties

jdbc.driverClassName=com.mysql.jdbc.Driverjdbc.url=jdbc:mysql://localhost/mhmljdbc.user=rootjdbc.pass=rootpass

其他配置,gradle.propertis

modelPackage=com.dreamliner.mhml.entity#生成的mapper接口类所在包mapperPackage=com.dreamliner.mhml.mapper#生成的mapper xml文件所在包，默认存储在resources目录下sqlMapperPackage=mybatis_mapper

db/generatorConfig配置

db/generatorConfig.xml文件用于配置生成策略,官网详细介绍

<?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>    <context id="Mysql" targetRuntime="MyBatis3Simple" defaultModelType="flat">        <plugin type="tk.mybatis.mapper.generator.MapperPlugin">            <property name="mappers" value="tk.mybatis.mapper.common.Mapper"/>            <!-- caseSensitive默认false，当数据库表名区分大小写时，可以将该属性设置为true -->            <property name="caseSensitive" value="true"/>        </plugin>        <commentGenerator>            <property name="suppressAllComments" value="true"/>        </commentGenerator>        <jdbcConnection driverClass="${driverClass}"                        connectionURL="${connectionURL}"                        userId="${userId}"                        password="${password}">        </jdbcConnection>        <javaModelGenerator targetPackage="${modelPackage}" targetProject="${src_main_java}"/>        <sqlMapGenerator targetPackage="${sqlMapperPackage}" targetProject="${src_main_resources}"/>        <javaClientGenerator targetPackage="${mapperPackage}" targetProject="${src_main_java}" type="XMLMAPPER"/>      <!-- sql占位符，表示所有的表 -->    <table tableName="%">                    <generatedKey column="epa_id" sqlStatement="Mysql" identity="true" />                </table>    </context></generatorConfiguration>

生成代码

gradle  mybatisGenerate

http://www.chenkaihua.com/2015/12/19/running-mybatis-generator-with-gradle/