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java_model_dao_自动生成_generator-mybatis-generator-1.3.2 基于maven插件

2024-07-06 09:24:11   229人阅读

用mybatis原因很简单，易用，性能。是介于jdbc和hibernate之间的一个完美方案。

很简单：

1:配置pom 

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.test.database</groupId>
    <artifactId>dao-core</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <dependencies>

        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.1.1</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.30</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.7</version>
            <type>jar</type>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <!-- mybits dao层 自动生成代码 插件 -->
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.2</version>
                <configuration>
                    <verbose>true</verbose>
                    <overwrite>true</overwrite>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

2: src/main/resources 下新建 generatorConfig.xml

<?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>
    <!--classPathEntry:数据库的JDBC驱动 -->
    <classPathEntry
        location="D:\soft_源程序\DB\mysql\mysql-connector-java-5.1.19-bin.jar" />

    <context id="MysqlTables" targetRuntime="MyBatis3">

        <!-- 注意这里面的顺序确定的，不能随变更改 -->
        <!-- 自定义的分页插件 <plugin type="com.deppon.foss.module.helloworld.shared.PaginationPlugin"/> -->

        <!-- 可选的（0 or 1） -->
        <!-- 注释生成器 -->
        <commentGenerator>
            <!-- 是否去除自动生成的注释 true：是 ： false:否 -->
            <property name="suppressAllComments" value="true" />
        </commentGenerator>

        <!-- 必须的（1 required） -->
        <!--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/data?useUnicode=true&amp;characterEncoding=UTF-8"
            userId="root" password="123654">
        </jdbcConnection>

        <!-- 可选的（0 or 1） -->
        <!-- 类型转换器或者加类型解析器 -->
        <!-- 默认false，把JDBC DECIMAL 和 NUMERIC 类型解析为 Integer true，把JDBC DECIMAL 和 
            NUMERIC 类型解析为java.math.BigDecimal -->
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>


        <!-- 必须的（1 required） -->
        <!-- java模型生成器 -->
        <!-- targetProject:自动生成代码的位置 -->
        <javaModelGenerator targetPackage="com.test.model"
            targetProject="F:\Workspaces\workspace_eclipse\dao-core\src\main\java">
            <!-- TODO enableSubPackages:是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="true" />
            <!-- 从数据库返回的值被清理前后的空格 -->
            <property name="trimStrings" value="true" />
        </javaModelGenerator>

        <!-- 必须的（1 required） -->
        <!-- map xml 生成器 -->
        <sqlMapGenerator targetPackage="com.test.persistence"
            targetProject="F:\Workspaces\workspace_eclipse\dao-core\src\main\resources">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>

        <!-- 可选的（0 or 1） -->
        <!-- mapper 或者就是dao接口生成器 -->
        <javaClientGenerator targetPackage="com.test.dao"
            targetProject="F:\Workspaces\workspace_eclipse\dao-core\src\main\java"
            type="XMLMAPPER">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>

        <!-- 必须的（1...N） -->
        <!-- pojo 实体生成器 -->
        <!-- tableName:用于自动生成代码的数据库表；domainObjectName:对应于数据库表的javaBean类名 -->
        <!-- schema即为数据库名 可不写 -->
        <table schema="data" tableName="tab_city" domainObjectName="CityModel"
            enableInsert="true">
            <!-- 忽略字段 可选的（0 or 1） -->
            <!-- <ignoreColumn column="is_use" /> -->
            <!--//无论字段是什么类型，生成的类属性都是varchar。 可选的（0 or 1） 测试无效 -->
            <!-- <columnOverride column="city_code" jdbcType="VARCHAR" /> -->
        </table>




    </context>

</generatorConfiguration>

 

 

3： 点击pom，run as maven bulid  :  mybatis-generator:generate     红色字最好自己手敲或者copy. 

构建完后：

4：项目中使用的话，需要建立 mybatis-config.xml 在 src/main/resources 下

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver" />
                <property name="url" value="jdbc:mysql://localhost:3306/data" />
                <property name="username" value="root" />
                <property name="password" value="123654" />
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="com/test/persistence/CityModelMapper.xml" />
    </mappers>
    <!-- <typeAliases> <typeAlias type="com.hoo.entity.Account" alias="account"/> 
        </typeAliases> -->
</configuration>

5： 建立测试

5.1 java传统测试

TestDao.java

package com.test.dao;

import java.io.IOException;
import java.io.Reader;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import com.test.model.CityModel;

public class TestDao {
    public static void main(String[] args) {
        SqlSession session = null;
        String resource = "mybatis-config.xml";
        Reader reader = null;
        try {
            reader = Resources.getResourceAsReader(resource);
            SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder()
                    .build(reader);
            session = sessionFactory.openSession();

            CityModelMapper cityModelMapper = session
                    .getMapper(CityModelMapper.class);

            // CityModel cityModel = new CityModel();
            // cityModel.setId(7);
            // cityModel.setCityName("test7");
            // cityModel.setCityCode(2);
            // cityModelMapper.insert(cityModel);
            // session.commit();
            // System.out.println("插入一个city name" + cityModel.getCityName());
            CityModel cityModel = cityModelMapper.selectByPrimaryKey(4);
            session.commit();
            System.out.println(cityModel.getCityName());
            cityModel.setCityName("testchange");
            ;
            cityModelMapper.updateByPrimaryKey(cityModel);
            session.commit();
            System.out.println("update");

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (null != session)
                session.close();
        }
    }
}

5.2 单元测试：

CityModelMapperTest.java

package com.test.dao;

import static org.junit.Assert.fail;

import java.io.Reader;
import java.util.List;

import junit.framework.Assert;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import com.test.model.CityModel;
import com.test.model.CityModelExample;

public class CityModelMapperTest {
    SqlSession session = null;
    CityModelMapper cityModelMapper = null;

    @Before
    public void setUp() throws Exception {
        String resource = "mybatis-config.xml";
        Reader reader = null;
        reader = Resources.getResourceAsReader(resource);
        SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder()
                .build(reader);
        session = sessionFactory.openSession();
        cityModelMapper = session.getMapper(CityModelMapper.class);
    }

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

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

    @Test
    public void testDeleteByPrimaryKey() {

        int flag = cityModelMapper.deleteByPrimaryKey(10);
        session.commit();
        System.out.println("返回值：" + flag);
        System.out.println("删除一个city id " + 10);
        Assert.assertTrue(flag > 0);
    }

    @Test
    public void testInsert() {
        CityModel cityModel = new CityModel();
        int i = 10;
        cityModel.setId(i);
        cityModel.setCityName("test" + i);
        cityModel.setCityCode(i);
        cityModelMapper.insert(cityModel);
        session.commit();
        System.out.println("插入一个city name" + cityModel.getCityName());
    }

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

    @Test
    public void testSelectByExample() {
        CityModelExample example = new CityModelExample();
        example.setDistinct(false);
        example.setOrderByClause("id");
        example.createCriteria().andIdBetween(1, 3);
        List<CityModel> cityList = cityModelMapper.selectByExample(example);
        for (CityModel cityModel : cityList) {
            System.out.println("id:" + cityModel.getId() + "\n" + "name:"
                    + cityModel.getCityName() + "\n");
        }
        fail("Not yet implemented");
    }

    @Test
    public void testSelectByPrimaryKey() {
        CityModel cityModel = cityModelMapper.selectByPrimaryKey(8);
        System.out.println("查询到一个city" + cityModel.getCityName());
        Assert.assertTrue(null != cityModel);
    }

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

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

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

    @Test
    public void testUpdateByPrimaryKey() {
        CityModel cityModel = new CityModel();
        int i = 8;
        cityModel.setId(i);
        cityModel.setCityName("updaet" + i);
        cityModel.setCityCode(i);
        int flag = cityModelMapper.updateByPrimaryKey(cityModel);
        session.commit();
        System.out.println("返回值：" + flag);
        System.out.println("update一个city id " + i);
        Assert.assertTrue(flag > 0);
    }

    @After
    public void tearDown() throws Exception {
    }

}

6: 用到的sql

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DROP TABLE IF EXISTS `tab_city`;
CREATE TABLE `tab_city` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT ‘ID‘,
  `city_name` varchar(255) DEFAULT NULL COMMENT ‘城市名称‘,
  `city_code` int(11) NOT NULL COMMENT ‘用三位数字表示 例如 001 代表朝阳‘,
  `is_use` int(11) DEFAULT NULL COMMENT ‘是否有效‘,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=utf8 COMMENT=‘城市代码表‘;

完。

 


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