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在码农的世界里，优美的应用体验，来源于程序员对细节的处理以及自我要求的境界。
Maven插件 mybatis-generator Mybatis自动生成实体代码的插件 Maven 是一个优秀的项目构建和管理工具，mybatis-generator 插件用于快速生成 Mybatis xml 与实体 Bean。 分为三步，第一步在pom.xml中做两处配置，第二步创建generatorConfig.xml，第三步运行执行命令生成代码 1 mybatis-generator 插件 Maven 配置首先在你项目的 pom.xml 中配置插件
<build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> <!-- mybatis generator 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> <configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile> <overwrite>true</overwrite> <verbose>true</verbose> </configuration> <!-- 配置数据库链接及mybatis generator core依赖 生成mapper时使用 --> <dependencies> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.40</version> </dependency> <dependency> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-core</artifactId> <version>1.4.0</version> </dependency> </dependencies> </plugin>
</plugins> </build>
2 mybatis-generator 插件 配置文件创建在第一步中 我们通过 configurationFile 标签配置了 mybatis-generator 使用的配置文件。 <configurationFile>...generatorConfig.xml</configurationFile>
所以第二步就是创建配置文件 
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE generatorConfiguration PUBLIC "-////DTD MyBatis Generator Configuration 1.0//EN" "http:///dtd/mybatis-generator-config_1_0.dtd"><!-- 配置生成器 --><generatorConfiguration> <context id="DB2Tables" targetRuntime="MyBatis3">
<commentGenerator> <property name="suppressDate" value="true"/> <!-- 是否去除自动生成的注释 true：是 ：false:否 --> <property name="suppressAllComments" value="true"/> </commentGenerator>
<!-- 数据库链接URL，用户名、密码 --> <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/test_mybatis" userId="zhaolong" password="123456"> </jdbcConnection>
<!-- 类型转换 --> <javaTypeResolver> <!-- 是否使用BigDecimals，false可自动转化以下类型(Long Integer Short等) --> <property name="forceBigDecimals" value="false"/> </javaTypeResolver>
<!-- 生成模型的包名和位置--> <javaModelGenerator targetPackage="com.example.demo.m" targetProject="src/main/java"> <property name="enableSubPackages" value="true"/> <property name="trimStrings" value="true"/> </javaModelGenerator>
<!-- 生成映射文件的包名和位置--> <sqlMapGenerator targetPackage="mappers" targetProject="src/main/resources"> <property name="enableSubPackages" value="true"/> </sqlMapGenerator>
<!-- 生成DAO的包名和位置 --> <javaClientGenerator type="XMLMAPPER" targetPackage="com.example.demo.m" targetProject="src/main/java"> <property name="enableSubPackages" value="true"/> </javaClientGenerator>
<!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名--> <table tableName="t_user" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"> <property name="useActualColumnNames" value="false"/> <!-- 数据库表主键 --> <generatedKey column="id" sqlStatement="Mysql" identity="true"/> </table> </context>
</generatorConfiguration>
大家在使用时，直接复制我这个配置文件，然后修改里面的数据库连接以及要生成的表的 tableName就可以了。 3 第三步就是执行命令生成代码
生成的 User.java 文件内容如下
public class User { private Long id;
private String idCard;
private String uName;
private String uPhone;
private Integer uAge;
private String uImage;
private Date createTime;
... get set 方法省略 }
生成的 UserMapper.java 文件内容如下 public interface UserMapper { int deleteByPrimaryKey(Long id);
int insert(User record);
int insertSelective(User record);
User selectByPrimaryKey(Long id);
int updateByPrimaryKeySelective(User record);
int updateByPrimaryKey(User record);}
生成的 UserMapper.xml 文件内容如下 <?xml version="1.0" encoding="UTF-8"?><!DOCTYPE mapper PUBLIC "-////DTD Mapper 3.0//EN" "http:///dtd/mybatis-3-mapper.dtd"><mapper namespace="com.example.demo.m.UserMapper"> <resultMap id="BaseResultMap" type="com.example.demo.m.User"> <id column="id" jdbcType="BIGINT" property="id" /> <result column="id_card" jdbcType="VARCHAR" property="idCard" /> <result column="u_name" jdbcType="VARCHAR" property="uName" /> <result column="u_phone" jdbcType="VARCHAR" property="uPhone" /> <result column="u_age" jdbcType="INTEGER" property="uAge" /> <result column="u_image" jdbcType="VARCHAR" property="uImage" /> <result column="create_time" jdbcType="TIMESTAMP" property="createTime" /> </resultMap> <sql id="Base_Column_List"> id, id_card, u_name, u_phone, u_age, u_image, create_time </sql> <select id="selectByPrimaryKey" parameterType="java.lang.Long" resultMap="BaseResultMap"> select <include refid="Base_Column_List" /> from t_user where id = #{id,jdbcType=BIGINT} </select> <delete id="deleteByPrimaryKey" parameterType="java.lang.Long"> delete from t_user where id = #{id,jdbcType=BIGINT} </delete> <insert id="insert" parameterType="com.example.demo.m.User"> <selectKey keyProperty="id" order="AFTER" resultType="java.lang.Long"> SELECT LAST_INSERT_ID() </selectKey> insert into t_user (id_card, u_name, u_phone, u_age, u_image, create_time ) values (#{idCard,jdbcType=VARCHAR}, #{uName,jdbcType=VARCHAR}, #{uPhone,jdbcType=VARCHAR}, #{uAge,jdbcType=INTEGER}, #{uImage,jdbcType=VARCHAR}, #{createTime,jdbcType=TIMESTAMP} ) </insert> <insert id="insertSelective" parameterType="com.example.demo.m.User"> <selectKey keyProperty="id" order="AFTER" resultType="java.lang.Long"> SELECT LAST_INSERT_ID() </selectKey> insert into t_user <trim prefix="(" suffix=")" suffixOverrides=","> <if test="idCard != null"> id_card, </if> <if test="uName != null"> u_name, </if> <if test="uPhone != null"> u_phone, </if> <if test="uAge != null"> u_age, </if> <if test="uImage != null"> u_image, </if> <if test="createTime != null"> create_time, </if> </trim> <trim prefix="values (" suffix=")" suffixOverrides=","> <if test="idCard != null"> #{idCard,jdbcType=VARCHAR}, </if> <if test="uName != null"> #{uName,jdbcType=VARCHAR}, </if> <if test="uPhone != null"> #{uPhone,jdbcType=VARCHAR}, </if> <if test="uAge != null"> #{uAge,jdbcType=INTEGER}, </if> <if test="uImage != null"> #{uImage,jdbcType=VARCHAR}, </if> <if test="createTime != null"> #{createTime,jdbcType=TIMESTAMP}, </if> </trim> </insert> <update id="updateByPrimaryKeySelective" parameterType="com.example.demo.m.User"> update t_user <set> <if test="idCard != null"> id_card = #{idCard,jdbcType=VARCHAR}, </if> <if test="uName != null"> u_name = #{uName,jdbcType=VARCHAR}, </if> <if test="uPhone != null"> u_phone = #{uPhone,jdbcType=VARCHAR}, </if> <if test="uAge != null"> u_age = #{uAge,jdbcType=INTEGER}, </if> <if test="uImage != null"> u_image = #{uImage,jdbcType=VARCHAR}, </if> <if test="createTime != null"> create_time = #{createTime,jdbcType=TIMESTAMP}, </if> </set> where id = #{id,jdbcType=BIGINT} </update> <update id="updateByPrimaryKey" parameterType="com.example.demo.m.User"> update t_user set id_card = #{idCard,jdbcType=VARCHAR}, u_name = #{uName,jdbcType=VARCHAR}, u_phone = #{uPhone,jdbcType=VARCHAR}, u_age = #{uAge,jdbcType=INTEGER}, u_image = #{uImage,jdbcType=VARCHAR}, create_time = #{createTime,jdbcType=TIMESTAMP} where id = #{id,jdbcType=BIGINT} </update></mapper>
完毕 不局限于思维，不局限语言限制，才是编程的最高境界。
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