MyBatis中使用逆向工程

4.1使用逆向工程所需的工程模式：

4.2 GeneratorSqlmap.java

package com.eduask.generator;

import java.io.File;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

importorg.mybatis.generator.api.MyBatisGenerator;

importorg.mybatis.generator.config.Configuration;

importorg.mybatis.generator.config.xml.ConfigurationParser;

importorg.mybatis.generator.exception.XMLParserException;

importorg.mybatis.generator.internal.DefaultShellCallback;

public class GeneratorSqlmap {

publicvoid generator() throws Exception{

List<String>warnings = new ArrayList<String>();

booleanoverwrite = true;

FileconfigFile = new File("generatorConfig.xml");

ConfigurationParsercp = new ConfigurationParser(warnings);

Configurationconfig = cp.parseConfiguration(configFile);

DefaultShellCallback callback = newDefaultShellCallback(overwrite);

MyBatisGeneratormyBatisGenerator = new MyBatisGenerator(config,

callback,warnings);

myBatisGenerator.generate(null);

}

publicstatic void main(String[] args) throws Exception {

try{

GeneratorSqlmapgeneratorSqlmap = new GeneratorSqlmap();

generatorSqlmap.generator();

}catch (Exception e) {

e.printStackTrace();

}

}

}

4.3 generatorConfig.xml

<?xml version="1.0"encoding="UTF-8"?>

<!DOCTYPE generatorConfiguration

PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration1.0//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/mydb"userId="root"

password="root">

</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.eduask.pojo"

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.eduask.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.eduask.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 tableName="user1"></table>

</context>

</generatorConfiguration>

4.4 下面就开始编写建立数据库表：

4.5 执行GeneratorSqlmap.java代码：

4.6刷新工程，之后会看到：

4.7之后我们新建一个测试类，用于数据的增删改查;

代码如下：

packagecom.eduask.test;

//新建一个User1Test的测试类，用于数据的增删改查;

importjava.io.IOException;

importjava.io.InputStream;

importorg.apache.ibatis.io.Resources;

importorg.apache.ibatis.session.SqlSession;

importorg.apache.ibatis.session.SqlSessionFactory;

importorg.apache.ibatis.session.SqlSessionFactoryBuilder;

importorg.junit.Before;

importorg.junit.Test;

importcom.eduask.mapper.User1Mapper;

importcom.eduask.pojo.User1;

import com.eduask.pojo.User1Example;

public class User1Test {

//初始化;

private SqlSessionFactory sessionFactory;

@Before

public void up() throws IOException{

InputStream is=Resources.getResourceAsStream("SQLMapConfig.xml");

sessionFactory=new SqlSessionFactoryBuilder().build(is);

}

//user1Add

@Test

public void insertUser() throws IOException {

SqlSession session=sessionFactory.openSession();

User1Mapperuser1Mapper=session.getMapper(User1Mapper.class);

User1 u=new User1(1, "tom", "123456");

int result= user1Mapper.insert(u);

session.commit();

session.close();

if(result==1){

System.out.println("add success");

}else{

System.out.println("excute failure");

}

}

}

4.8数据库中查询：