MyBatis快速入门第八讲——MyBatis逆向工程自动生成代码

<?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="testTables" targetRuntime="MyBatis3">
		<commentGenerator>
			<!-- 是否去除自动生成的注释 true：是 ： false:否 -->
			<property name="suppressAllComments" value="true" />
		</commentGenerator>
		<!--数据库连接的信息：驱动类、连接地址、用户名、密码 -->
		<jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/mybatis" userId="root" password="liayun">
		</jdbcConnection>
		<!-- <jdbcConnection driverClass="oracle.jdbc.OracleDriver" connectionURL="jdbc:oracle:thin:@127.0.0.1:1521:yycg" userId="yycg" password="yycg"> </jdbcConnection> -->

		<!-- 默认false，把JDBC DECIMAL 和 NUMERIC 类型解析为 Integer，为 true时把JDBC DECIMAL 和 NUMERIC 类型解析为java.math.BigDecimal -->
		<javaTypeResolver>
			<property name="forceBigDecimals" value="false" />
		</javaTypeResolver>

		<!-- targetProject:生成PO类的位置 -->
		<javaModelGenerator targetPackage="com.meimeixia.ssm.po" targetProject=".\src">
			<!-- enableSubPackages:是否让schema作为包的后缀 -->
			<property name="enableSubPackages" value="false" />
			<!-- 从数据库返回的值被清理前后的空格 -->
			<property name="trimStrings" value="true" />
		</javaModelGenerator>
        <!-- targetProject:mapper映射文件生成的位置 -->
		<sqlMapGenerator targetPackage="com.meimeixia.ssm.mapper" targetProject=".\src">
			<!-- enableSubPackages:是否让schema作为包的后缀 -->
			<property name="enableSubPackages" value="false" />
		</sqlMapGenerator>
		<!-- targetPackage：mapper接口生成的位置 -->
		<javaClientGenerator type="XMLMAPPER" targetPackage="com.meimeixia.ssm.mapper" targetProject=".\src">
			<!-- enableSubPackages:是否让schema作为包的后缀 -->
			<property name="enableSubPackages" value="false" />
		</javaClientGenerator>
		<!-- 指定数据库表 -->
		<table schema="" tableName="user"></table>
		<table schema="" tableName="order"></table>
		
		<!-- 有些表的字段需要指定java类型 <table schema="" tableName=""> <columnOverride column="" javaType="" /> </table> -->
	</context>
</generatorConfiguration>

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.mybatis.generator.api.MyBatisGenerator;
import org.mybatis.generator.config.Configuration;
import org.mybatis.generator.config.xml.ConfigurationParser;
import org.mybatis.generator.exception.XMLParserException;
import org.mybatis.generator.internal.DefaultShellCallback;

public class GeneratorSqlmap { 
   

	public void generator() throws Exception{ 
   

		List<String> warnings = new ArrayList<String>();
		boolean overwrite = true;
		//指定逆向工程配置文件
		File configFile = new File("generatorConfig.xml"); 
		ConfigurationParser cp = new ConfigurationParser(warnings);
		Configuration config = cp.parseConfiguration(configFile);
		DefaultShellCallback callback = new DefaultShellCallback(overwrite);
		MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config,
				callback, warnings);
		myBatisGenerator.generate(null);

	} 
	public static void main(String[] args) throws Exception { 
   
		try { 
   
			GeneratorSqlmap generatorSqlmap = new GeneratorSqlmap();
			generatorSqlmap.generator();
		} catch (Exception e) { 
   
			e.printStackTrace();
		}
		
	}

}

<!-- 动态代理配置的第二种方式：配置包扫描器（推荐使用这种开发方式） -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
	<!-- basePackage属性配置要扫描的包，多个包之间可用","进行分隔 -->
	<!-- <property name="basePackage" value="com.meimeixia.mybatis.mapper" /> -->
	<property name="basePackage" value="com.meimeixia.ssm.mapper" />
</bean>

package com.meimeixia.mybatis.test;

import static org.junit.Assert.*;

import java.util.List;

import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.meimeixia.ssm.mapper.UserMapper;
import com.meimeixia.ssm.po.User;
import com.meimeixia.ssm.po.UserExample;
import com.meimeixia.ssm.po.UserExample.Criteria;

public class UserMapperGTest { 
   
	
	private ApplicationContext applicationContext;
	
	@Before
	public void init() { 
   
		applicationContext = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
	}

	@Test
	public void testInsertSelective() { 
   
		UserMapper userMapper = applicationContext.getBean(UserMapper.class);
		User user = new User();
		user.setUsername("诸葛亮");
		user.setAddress("广州萝岗");
		user.setSex("1");
		userMapper.insertSelective(user);
	}

	@Test
	public void testSelectByExample() { 
   
		UserMapper userMapper = applicationContext.getBean(UserMapper.class);
		//UserExample类是用来拼装查询条件用的
		UserExample example = new UserExample();
		//创建一个Criteria对象（Criteria类是UserExample类里面的内部类，Criteria类是干什么用的呢？它是专门用于封装自定义查询条件的）
		Criteria criteria = example.createCriteria();
		//设置查询条件
		criteria.andUsernameLike("%范%");
		criteria.andSexEqualTo("2");
		//执行查询
		List<User> list = userMapper.selectByExample(example);
		for (User user : list) { 
   
			System.out.println(user);
		}
	}

	@Test
	public void testSelectByPrimaryKey() { 
   
		UserMapper userMapper = applicationContext.getBean(UserMapper.class);
		User user = userMapper.selectByPrimaryKey(30);
		System.out.println(user);
	}

	@Test
	public void testUpdateByPrimaryKeySelective() { 
   
		fail("Not yet implemented");
	}

}