使用MyBatis Generator自动生成代码

本文给出一个在Maven工程中，使用MyBatis Generator代码生成工具生成代码的示例。

自动生成的文件有以下几个部分：

• Dao (Mapper) 
• Entity 以及 Entity对应的Example
• XML 

环境准备

数据库表

建立一个用于测试的用户表，包含user_id、email、name三个属性，建立的SQL语句以下：

CREATE TABLE `t_user` (
  `user_id` int(11) NOT NULL,
  `email` varchar(64) DEFAULT NULL,
  `name` varchar(30) DEFAULT NULL,
  PRIMARY KEY (`user_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

依赖包

添加相关的依赖包，主要包含MyBatis包、MyBatis Generator包、MySQL链接包以及log4j包 (主要用于输出日志)

<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>1.2.17</version>
		</dependency>
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis</artifactId>
			<version>${mybatis.version}</version>
		</dependency>
		<dependency>
			<groupId>org.mybatis.generator</groupId>
			<artifactId>mybatis-generator-core</artifactId>
			<version>${mybatis.generator.version}</version>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>${mysql.connector.version}</version>
		</dependency>

完整的pom.xml文件内容以下：

<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>my.mybatis.example</groupId>
	<artifactId>MBGeneratorExample</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<mybatis.version>3.2.6</mybatis.version>
		<mybatis.generator.version>1.3.2</mybatis.generator.version>
		<mysql.connector.version>5.1.6</mysql.connector.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>1.2.17</version>
		</dependency>
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis</artifactId>
			<version>${mybatis.version}</version>
		</dependency>
		<dependency>
			<groupId>org.mybatis.generator</groupId>
			<artifactId>mybatis-generator-core</artifactId>
			<version>${mybatis.generator.version}</version>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>${mysql.connector.version}</version>
		</dependency>
	</dependencies>
</project>

具体Maven工程的结构以下

MyBatis Generator配置

建立数据库属性文件

建立一个数据库属性文件generator.properties，配置数据库链接、数据库用户名、密码等，如:

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://YOUR_IP:YOUR_PORT/YOUR_DATABASE?useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull
jdbc.username=YOUR_USERNAME
jdbc.password=YOUR_PASSWPRD

建立Generator配置文件

建立一个自动生成代码的配置文件，属性文件generatorConfig.xml。 配置Model、SQL XML文件以及Dao路径配置等。

引入属性配置文件

<!-- 引入配置文件 -->
	    <properties resource="generator.properties" />

对象配置生成的Model对象

<!-- 数据库链接信息 -->
		<jdbcConnection driverClass="${jdbc.driverClassName}"
			connectionURL="${jdbc.url}" userId="${jdbc.username}" password="${jdbc.password}" />

配置数据库链接

<!-- 生成Model对象路径配置 -->
		<javaModelGenerator targetPackage="my.mybatis.generator.auto.entity"
			targetProject="src\main\java">
			<property name="enableSubPackages" value="true" />
			<property name="trimStrings" value="true" />
		</javaModelGenerator>

配置生成的sqlXML文件

<!-- 生成sqlXML文件路径配置 -->
		<sqlMapGenerator targetPackage="my.mybatis.generator.auto.entity.xml"
			targetProject="src\main\java">
			<property name="enableSubPackages" value="true" />
		</sqlMapGenerator>

配置生成的Dao(Mapper)

<!-- 生成DAO的类文件路径配置 -->
		<javaClientGenerator targetPackage="my.mybatis.generator.auto.dao"
			targetProject="src\main\java" type="XMLMAPPER">
			<property name="enableSubPackages" value="true" />
		</javaClientGenerator>

配置生成表信息

<!--要生成哪些表 -->
		<table tableName="t_user" domainObjectName="User" />

generatorConfig.xml具体的配置信息以下：

<?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>
	<!-- 引入配置文件 -->
	<properties resource="generator.properties" />

	<context id="context1" targetRuntime="MyBatis3">

		<!-- 数据库链接信息 -->
		<jdbcConnection driverClass="${jdbc.driverClassName}"
			connectionURL="${jdbc.url}" userId="${jdbc.username}" password="${jdbc.password}" />

		<!-- 生成Model对象路径配置 -->
		<javaModelGenerator targetPackage="my.mybatis.generator.auto.entity"
			targetProject="src\main\java">
			<property name="enableSubPackages" value="true" />
			<property name="trimStrings" value="true" />
		</javaModelGenerator>

		<!-- 生成sqlXML文件路径配置 -->
		<sqlMapGenerator targetPackage="my.mybatis.generator.auto.entity.xml"
			targetProject="src\main\java">
			<property name="enableSubPackages" value="true" />
		</sqlMapGenerator>

		<!-- 生成DAO的类文件路径配置 -->
		<javaClientGenerator targetPackage="my.mybatis.generator.auto.dao"
			targetProject="src\main\java" type="XMLMAPPER">
			<property name="enableSubPackages" value="true" />
		</javaClientGenerator>

		<!--要生成哪些表 -->
		<table tableName="t_user" domainObjectName="User" />
	</context>
</generatorConfiguration>

代码执行

有了上述的配置以后，咱们就能够编写一个简单的类来完成代码的生成。

ShellRunner运行

使用ShellRunner来完成程序的执行，如:

package my.mabatis.example.runner;

import org.mybatis.generator.api.ShellRunner;

/**
 * 
 * @author wangmengjun
 *
 */
public class Main {

	public static void main(String[] args) {

		String config = Main.class.getClassLoader()
				.getResource("generatorConfig.xml").getFile();
		String[] arg = { "-configfile", config, "-overwrite" };
		ShellRunner.main(arg);
	}
}

运行结果

运行上述程序，咱们就能看到自动生成的文件就产生了。

Dao (Mapper)

package my.mybatis.generator.auto.dao;

import java.util.List;
import my.mybatis.generator.auto.entity.User;
import my.mybatis.generator.auto.entity.UserExample;
import org.apache.ibatis.annotations.Param;

public interface UserMapper {
    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    int countByExample(UserExample example);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    int deleteByExample(UserExample example);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    int deleteByPrimaryKey(Integer userId);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    int insert(User record);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    int insertSelective(User record);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    List<User> selectByExample(UserExample example);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    User selectByPrimaryKey(Integer userId);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    int updateByExampleSelective(@Param("record") User record, @Param("example") UserExample example);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    int updateByExample(@Param("record") User record, @Param("example") UserExample example);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    int updateByPrimaryKeySelective(User record);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    int updateByPrimaryKey(User record);
}

SQL XML

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="my.mybatis.generator.auto.dao.UserMapper" >
  <resultMap id="BaseResultMap" type="my.mybatis.generator.auto.entity.User" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Tue Nov 08 18:17:37 CST 2016.
    -->
    <id column="user_id" property="userId" jdbcType="INTEGER" />
    <result column="email" property="email" jdbcType="VARCHAR" />
    <result column="name" property="name" jdbcType="VARCHAR" />
  </resultMap>
  <sql id="Example_Where_Clause" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Tue Nov 08 18:17:37 CST 2016.
    -->
    <where >
      <foreach collection="oredCriteria" item="criteria" separator="or" >
        <if test="criteria.valid" >
          <trim prefix="(" suffix=")" prefixOverrides="and" >
            <foreach collection="criteria.criteria" item="criterion" >
              <choose >
                <when test="criterion.noValue" >
                  and ${criterion.condition}
                </when>
                <when test="criterion.singleValue" >
                  and ${criterion.condition} #{criterion.value}
                </when>
                <when test="criterion.betweenValue" >
                  and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
                </when>
                <when test="criterion.listValue" >
                  and ${criterion.condition}
                  <foreach collection="criterion.value" item="listItem" open="(" close=")" separator="," >
                    #{listItem}
                  </foreach>
                </when>
              </choose>
            </foreach>
          </trim>
        </if>
      </foreach>
    </where>
  </sql>
  <sql id="Update_By_Example_Where_Clause" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Tue Nov 08 18:17:37 CST 2016.
    -->
    <where >
      <foreach collection="example.oredCriteria" item="criteria" separator="or" >
        <if test="criteria.valid" >
          <trim prefix="(" suffix=")" prefixOverrides="and" >
            <foreach collection="criteria.criteria" item="criterion" >
              <choose >
                <when test="criterion.noValue" >
                  and ${criterion.condition}
                </when>
                <when test="criterion.singleValue" >
                  and ${criterion.condition} #{criterion.value}
                </when>
                <when test="criterion.betweenValue" >
                  and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
                </when>
                <when test="criterion.listValue" >
                  and ${criterion.condition}
                  <foreach collection="criterion.value" item="listItem" open="(" close=")" separator="," >
                    #{listItem}
                  </foreach>
                </when>
              </choose>
            </foreach>
          </trim>
        </if>
      </foreach>
    </where>
  </sql>
  <sql id="Base_Column_List" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Tue Nov 08 18:17:37 CST 2016.
    -->
    user_id, email, name
  </sql>
  <select id="selectByExample" resultMap="BaseResultMap" parameterType="my.mybatis.generator.auto.entity.UserExample" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Tue Nov 08 18:17:37 CST 2016.
    -->
    select
    <if test="distinct" >
      distinct
    </if>
    <include refid="Base_Column_List" />
    from t_user
    <if test="_parameter != null" >
      <include refid="Example_Where_Clause" />
    </if>
    <if test="orderByClause != null" >
      order by ${orderByClause}
    </if>
  </select>
  <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Tue Nov 08 18:17:37 CST 2016.
    -->
    select 
    <include refid="Base_Column_List" />
    from t_user
    where user_id = #{userId,jdbcType=INTEGER}
  </select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Tue Nov 08 18:17:37 CST 2016.
    -->
    delete from t_user
    where user_id = #{userId,jdbcType=INTEGER}
  </delete>
  <delete id="deleteByExample" parameterType="my.mybatis.generator.auto.entity.UserExample" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Tue Nov 08 18:17:37 CST 2016.
    -->
    delete from t_user
    <if test="_parameter != null" >
      <include refid="Example_Where_Clause" />
    </if>
  </delete>
  <insert id="insert" parameterType="my.mybatis.generator.auto.entity.User" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Tue Nov 08 18:17:37 CST 2016.
    -->
    insert into t_user (user_id, email, name
      )
    values (#{userId,jdbcType=INTEGER}, #{email,jdbcType=VARCHAR}, #{name,jdbcType=VARCHAR}
      )
  </insert>
  <insert id="insertSelective" parameterType="my.mybatis.generator.auto.entity.User" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Tue Nov 08 18:17:37 CST 2016.
    -->
    insert into t_user
    <trim prefix="(" suffix=")" suffixOverrides="," >
      <if test="userId != null" >
        user_id,
      </if>
      <if test="email != null" >
        email,
      </if>
      <if test="name != null" >
        name,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides="," >
      <if test="userId != null" >
        #{userId,jdbcType=INTEGER},
      </if>
      <if test="email != null" >
        #{email,jdbcType=VARCHAR},
      </if>
      <if test="name != null" >
        #{name,jdbcType=VARCHAR},
      </if>
    </trim>
  </insert>
  <select id="countByExample" parameterType="my.mybatis.generator.auto.entity.UserExample" resultType="java.lang.Integer" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Tue Nov 08 18:17:37 CST 2016.
    -->
    select count(*) from t_user
    <if test="_parameter != null" >
      <include refid="Example_Where_Clause" />
    </if>
  </select>
  <update id="updateByExampleSelective" parameterType="map" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Tue Nov 08 18:17:37 CST 2016.
    -->
    update t_user
    <set >
      <if test="record.userId != null" >
        user_id = #{record.userId,jdbcType=INTEGER},
      </if>
      <if test="record.email != null" >
        email = #{record.email,jdbcType=VARCHAR},
      </if>
      <if test="record.name != null" >
        name = #{record.name,jdbcType=VARCHAR},
      </if>
    </set>
    <if test="_parameter != null" >
      <include refid="Update_By_Example_Where_Clause" />
    </if>
  </update>
  <update id="updateByExample" parameterType="map" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Tue Nov 08 18:17:37 CST 2016.
    -->
    update t_user
    set user_id = #{record.userId,jdbcType=INTEGER},
      email = #{record.email,jdbcType=VARCHAR},
      name = #{record.name,jdbcType=VARCHAR}
    <if test="_parameter != null" >
      <include refid="Update_By_Example_Where_Clause" />
    </if>
  </update>
  <update id="updateByPrimaryKeySelective" parameterType="my.mybatis.generator.auto.entity.User" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Tue Nov 08 18:17:37 CST 2016.
    -->
    update t_user
    <set >
      <if test="email != null" >
        email = #{email,jdbcType=VARCHAR},
      </if>
      <if test="name != null" >
        name = #{name,jdbcType=VARCHAR},
      </if>
    </set>
    where user_id = #{userId,jdbcType=INTEGER}
  </update>
  <update id="updateByPrimaryKey" parameterType="my.mybatis.generator.auto.entity.User" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Tue Nov 08 18:17:37 CST 2016.
    -->
    update t_user
    set email = #{email,jdbcType=VARCHAR},
      name = #{name,jdbcType=VARCHAR}
    where user_id = #{userId,jdbcType=INTEGER}
  </update>
</mapper>

Entity和Example

package my.mybatis.generator.auto.entity;

public class User {
    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column t_user.user_id
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    private Integer userId;

    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column t_user.email
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    private String email;

    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column t_user.name
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    private String name;

    /**
     * This method was generated by MyBatis Generator.
     * This method returns the value of the database column t_user.user_id
     *
     * @return the value of t_user.user_id
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    public Integer getUserId() {
        return userId;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method sets the value of the database column t_user.user_id
     *
     * @param userId the value for t_user.user_id
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    public void setUserId(Integer userId) {
        this.userId = userId;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method returns the value of the database column t_user.email
     *
     * @return the value of t_user.email
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    public String getEmail() {
        return email;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method sets the value of the database column t_user.email
     *
     * @param email the value for t_user.email
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    public void setEmail(String email) {
        this.email = email == null ? null : email.trim();
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method returns the value of the database column t_user.name
     *
     * @return the value of t_user.name
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    public String getName() {
        return name;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method sets the value of the database column t_user.name
     *
     * @param name the value for t_user.name
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    public void setName(String name) {
        this.name = name == null ? null : name.trim();
    }
}

package my.mybatis.generator.auto.entity;

import java.util.ArrayList;
import java.util.List;

public class UserExample {
    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    protected String orderByClause;

    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    protected boolean distinct;

    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    protected List<Criteria> oredCriteria;

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    public UserExample() {
        oredCriteria = new ArrayList<Criteria>();
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    public void setOrderByClause(String orderByClause) {
        this.orderByClause = orderByClause;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    public String getOrderByClause() {
        return orderByClause;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    public void setDistinct(boolean distinct) {
        this.distinct = distinct;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    public boolean isDistinct() {
        return distinct;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    public List<Criteria> getOredCriteria() {
        return oredCriteria;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    public void or(Criteria criteria) {
        oredCriteria.add(criteria);
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    public Criteria or() {
        Criteria criteria = createCriteriaInternal();
        oredCriteria.add(criteria);
        return criteria;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    public Criteria createCriteria() {
        Criteria criteria = createCriteriaInternal();
        if (oredCriteria.size() == 0) {
            oredCriteria.add(criteria);
        }
        return criteria;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    protected Criteria createCriteriaInternal() {
        Criteria criteria = new Criteria();
        return criteria;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    public void clear() {
        oredCriteria.clear();
        orderByClause = null;
        distinct = false;
    }

    /**
     * This class was generated by MyBatis Generator.
     * This class corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    protected abstract static class GeneratedCriteria {
        protected List<Criterion> criteria;

        protected GeneratedCriteria() {
            super();
            criteria = new ArrayList<Criterion>();
        }

        public boolean isValid() {
            return criteria.size() > 0;
        }

        public List<Criterion> getAllCriteria() {
            return criteria;
        }

        public List<Criterion> getCriteria() {
            return criteria;
        }

        protected void addCriterion(String condition) {
            if (condition == null) {
                throw new RuntimeException("Value for condition cannot be null");
            }
            criteria.add(new Criterion(condition));
        }

        protected void addCriterion(String condition, Object value, String property) {
            if (value == null) {
                throw new RuntimeException("Value for " + property + " cannot be null");
            }
            criteria.add(new Criterion(condition, value));
        }

        protected void addCriterion(String condition, Object value1, Object value2, String property) {
            if (value1 == null || value2 == null) {
                throw new RuntimeException("Between values for " + property + " cannot be null");
            }
            criteria.add(new Criterion(condition, value1, value2));
        }

        public Criteria andUserIdIsNull() {
            addCriterion("user_id is null");
            return (Criteria) this;
        }

        public Criteria andUserIdIsNotNull() {
            addCriterion("user_id is not null");
            return (Criteria) this;
        }

        public Criteria andUserIdEqualTo(Integer value) {
            addCriterion("user_id =", value, "userId");
            return (Criteria) this;
        }

        public Criteria andUserIdNotEqualTo(Integer value) {
            addCriterion("user_id <>", value, "userId");
            return (Criteria) this;
        }

        public Criteria andUserIdGreaterThan(Integer value) {
            addCriterion("user_id >", value, "userId");
            return (Criteria) this;
        }

        public Criteria andUserIdGreaterThanOrEqualTo(Integer value) {
            addCriterion("user_id >=", value, "userId");
            return (Criteria) this;
        }

        public Criteria andUserIdLessThan(Integer value) {
            addCriterion("user_id <", value, "userId");
            return (Criteria) this;
        }

        public Criteria andUserIdLessThanOrEqualTo(Integer value) {
            addCriterion("user_id <=", value, "userId");
            return (Criteria) this;
        }

        public Criteria andUserIdIn(List<Integer> values) {
            addCriterion("user_id in", values, "userId");
            return (Criteria) this;
        }

        public Criteria andUserIdNotIn(List<Integer> values) {
            addCriterion("user_id not in", values, "userId");
            return (Criteria) this;
        }

        public Criteria andUserIdBetween(Integer value1, Integer value2) {
            addCriterion("user_id between", value1, value2, "userId");
            return (Criteria) this;
        }

        public Criteria andUserIdNotBetween(Integer value1, Integer value2) {
            addCriterion("user_id not between", value1, value2, "userId");
            return (Criteria) this;
        }

        public Criteria andEmailIsNull() {
            addCriterion("email is null");
            return (Criteria) this;
        }

        public Criteria andEmailIsNotNull() {
            addCriterion("email is not null");
            return (Criteria) this;
        }

        public Criteria andEmailEqualTo(String value) {
            addCriterion("email =", value, "email");
            return (Criteria) this;
        }

        public Criteria andEmailNotEqualTo(String value) {
            addCriterion("email <>", value, "email");
            return (Criteria) this;
        }

        public Criteria andEmailGreaterThan(String value) {
            addCriterion("email >", value, "email");
            return (Criteria) this;
        }

        public Criteria andEmailGreaterThanOrEqualTo(String value) {
            addCriterion("email >=", value, "email");
            return (Criteria) this;
        }

        public Criteria andEmailLessThan(String value) {
            addCriterion("email <", value, "email");
            return (Criteria) this;
        }

        public Criteria andEmailLessThanOrEqualTo(String value) {
            addCriterion("email <=", value, "email");
            return (Criteria) this;
        }

        public Criteria andEmailLike(String value) {
            addCriterion("email like", value, "email");
            return (Criteria) this;
        }

        public Criteria andEmailNotLike(String value) {
            addCriterion("email not like", value, "email");
            return (Criteria) this;
        }

        public Criteria andEmailIn(List<String> values) {
            addCriterion("email in", values, "email");
            return (Criteria) this;
        }

        public Criteria andEmailNotIn(List<String> values) {
            addCriterion("email not in", values, "email");
            return (Criteria) this;
        }

        public Criteria andEmailBetween(String value1, String value2) {
            addCriterion("email between", value1, value2, "email");
            return (Criteria) this;
        }

        public Criteria andEmailNotBetween(String value1, String value2) {
            addCriterion("email not between", value1, value2, "email");
            return (Criteria) this;
        }

        public Criteria andNameIsNull() {
            addCriterion("name is null");
            return (Criteria) this;
        }

        public Criteria andNameIsNotNull() {
            addCriterion("name is not null");
            return (Criteria) this;
        }

        public Criteria andNameEqualTo(String value) {
            addCriterion("name =", value, "name");
            return (Criteria) this;
        }

        public Criteria andNameNotEqualTo(String value) {
            addCriterion("name <>", value, "name");
            return (Criteria) this;
        }

        public Criteria andNameGreaterThan(String value) {
            addCriterion("name >", value, "name");
            return (Criteria) this;
        }

        public Criteria andNameGreaterThanOrEqualTo(String value) {
            addCriterion("name >=", value, "name");
            return (Criteria) this;
        }

        public Criteria andNameLessThan(String value) {
            addCriterion("name <", value, "name");
            return (Criteria) this;
        }

        public Criteria andNameLessThanOrEqualTo(String value) {
            addCriterion("name <=", value, "name");
            return (Criteria) this;
        }

        public Criteria andNameLike(String value) {
            addCriterion("name like", value, "name");
            return (Criteria) this;
        }

        public Criteria andNameNotLike(String value) {
            addCriterion("name not like", value, "name");
            return (Criteria) this;
        }

        public Criteria andNameIn(List<String> values) {
            addCriterion("name in", values, "name");
            return (Criteria) this;
        }

        public Criteria andNameNotIn(List<String> values) {
            addCriterion("name not in", values, "name");
            return (Criteria) this;
        }

        public Criteria andNameBetween(String value1, String value2) {
            addCriterion("name between", value1, value2, "name");
            return (Criteria) this;
        }

        public Criteria andNameNotBetween(String value1, String value2) {
            addCriterion("name not between", value1, value2, "name");
            return (Criteria) this;
        }
    }

    /**
     * This class was generated by MyBatis Generator.
     * This class corresponds to the database table t_user
     *
     * @mbggenerated do_not_delete_during_merge Tue Nov 08 18:17:37 CST 2016
     */
    public static class Criteria extends GeneratedCriteria {

        protected Criteria() {
            super();
        }
    }

    /**
     * This class was generated by MyBatis Generator.
     * This class corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:17:37 CST 2016
     */
    public static class Criterion {
        private String condition;

        private Object value;

        private Object secondValue;

        private boolean noValue;

        private boolean singleValue;

        private boolean betweenValue;

        private boolean listValue;

        private String typeHandler;

        public String getCondition() {
            return condition;
        }

        public Object getValue() {
            return value;
        }

        public Object getSecondValue() {
            return secondValue;
        }

        public boolean isNoValue() {
            return noValue;
        }

        public boolean isSingleValue() {
            return singleValue;
        }

        public boolean isBetweenValue() {
            return betweenValue;
        }

        public boolean isListValue() {
            return listValue;
        }

        public String getTypeHandler() {
            return typeHandler;
        }

        protected Criterion(String condition) {
            super();
            this.condition = condition;
            this.typeHandler = null;
            this.noValue = true;
        }

        protected Criterion(String condition, Object value, String typeHandler) {
            super();
            this.condition = condition;
            this.value = value;
            this.typeHandler = typeHandler;
            if (value instanceof List<?>) {
                this.listValue = true;
            } else {
                this.singleValue = true;
            }
        }

        protected Criterion(String condition, Object value) {
            this(condition, value, null);
        }

        protected Criterion(String condition, Object value, Object secondValue, String typeHandler) {
            super();
            this.condition = condition;
            this.value = value;
            this.secondValue = secondValue;
            this.typeHandler = typeHandler;
            this.betweenValue = true;
        }

        protected Criterion(String condition, Object value, Object secondValue) {
            this(condition, value, secondValue, null);
        }
    }
}

通过上述步骤，自动产生代码的示例就完成了。

自定义生成

咱们也能够看到，产生的代码有自动产生的注释、具备Example类。

产生实现序列化接口的实体类

上述产生的Java类自动产生后，没有实现序列化接口java.io.Serializable。

若是要使生成的实体Java类实现java.io.Serializable接口，须要怎么作呢？

答案，很简单，使用org.mybatis.generator.plugins.SerializablePlugin自动化代码便可。只要在配置文件generatorConfig.xml中指定一个plugin便可。

<!-- 配置内置的或者自定义的Plugin -->
		<plugin type="org.mybatis.generator.plugins.SerializablePlugin"/>

而后，再次运行Main.java，咱们来看一下User类已经实现序列化接口了。

package my.mybatis.generator.auto.entity;

import java.io.Serializable;

public class User implements Serializable {
    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column t_user.user_id
     *
     * @mbggenerated Tue Nov 08 18:39:33 CST 2016
     */
    private Integer userId;

    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column t_user.email
     *
     * @mbggenerated Tue Nov 08 18:39:33 CST 2016
     */
    private String email;

    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column t_user.name
     *
     * @mbggenerated Tue Nov 08 18:39:33 CST 2016
     */
    private String name;

    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database table t_user
     *
     * @mbggenerated Tue Nov 08 18:39:33 CST 2016
     */
    private static final long serialVersionUID = 1L;

    /**
     * This method was generated by MyBatis Generator.
     * This method returns the value of the database column t_user.user_id
     *
     * @return the value of t_user.user_id
     *
     * @mbggenerated Tue Nov 08 18:39:33 CST 2016
     */
    public Integer getUserId() {
        return userId;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method sets the value of the database column t_user.user_id
     *
     * @param userId the value for t_user.user_id
     *
     * @mbggenerated Tue Nov 08 18:39:33 CST 2016
     */
    public void setUserId(Integer userId) {
        this.userId = userId;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method returns the value of the database column t_user.email
     *
     * @return the value of t_user.email
     *
     * @mbggenerated Tue Nov 08 18:39:33 CST 2016
     */
    public String getEmail() {
        return email;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method sets the value of the database column t_user.email
     *
     * @param email the value for t_user.email
     *
     * @mbggenerated Tue Nov 08 18:39:33 CST 2016
     */
    public void setEmail(String email) {
        this.email = email == null ? null : email.trim();
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method returns the value of the database column t_user.name
     *
     * @return the value of t_user.name
     *
     * @mbggenerated Tue Nov 08 18:39:33 CST 2016
     */
    public String getName() {
        return name;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method sets the value of the database column t_user.name
     *
     * @param name the value for t_user.name
     *
     * @mbggenerated Tue Nov 08 18:39:33 CST 2016
     */
    public void setName(String name) {
        this.name = name == null ? null : name.trim();
    }
}

不产生注释

配置文件中，能够配置commentGenerator来指定是否产生注释。若是不想产生注释，咱们能够将某些属性设置成true便可。如，

<!-- 注释产生配置 -->
		<commentGenerator>
			<property name="suppressAllComments" value="true" />
			<property name="suppressDate" value="true" />
		</commentGenerator>

运行Main.java，咱们来看一下User类已经不含有注释了。

package my.mybatis.generator.auto.entity;

import java.io.Serializable;

public class User implements Serializable {
    private Integer userId;

    private String email;

    private String name;

    private static final long serialVersionUID = 1L;

    public Integer getUserId() {
        return userId;
    }

    public void setUserId(Integer userId) {
        this.userId = userId;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email == null ? null : email.trim();
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name == null ? null : name.trim();
    }
}

不产生按照Example相关的操做

若是不想产生Example相关操做的方法，能够在table中配置，要过滤掉的方法便可。

一个示例以下：

<!--要生成哪些表 -->
		<table tableName="t_user" domainObjectName="User"
			enableCountByExample="false" enableDeleteByExample="false"
			enableSelectByExample="false" enableUpdateByExample="false" />

运行Main.java，咱们来看一下UserMapper类中已经不包含按照Example进行操做的方法了。不过，留着也是一个不错的学习示例，哈 :)

package my.mybatis.generator.auto.dao;

import my.mybatis.generator.auto.entity.User;

public interface UserMapper {
    int deleteByPrimaryKey(Integer userId);

    int insert(User record);

    int insertSelective(User record);

    User selectByPrimaryKey(Integer userId);

    int updateByPrimaryKeySelective(User record);

    int updateByPrimaryKey(User record);
}

还有其它不少自定义扩展的东西能够学习，你们能够查询相关的资料学习一下，这里就再也不一一给出了。

上述自定义例子，详细的generatorConfig.xml文件以下：

<?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>
	<!-- 引入配置文件 -->
	<properties resource="generator.properties" />

	<context id="context1" targetRuntime="MyBatis3">
		<!-- 配置内置的或者自定义的Plugin -->
		<plugin type="org.mybatis.generator.plugins.SerializablePlugin" />

		<!-- 注释产生配置 -->
		<commentGenerator>
			<property name="suppressAllComments" value="true" />
			<property name="suppressDate" value="true" />
		</commentGenerator>

		<!-- 数据库链接信息 -->
		<jdbcConnection driverClass="${jdbc.driverClassName}"
			connectionURL="${jdbc.url}" userId="${jdbc.username}" password="${jdbc.password}" />

		<!-- 生成Model对象路径配置 -->
		<javaModelGenerator targetPackage="my.mybatis.generator.auto.entity"
			targetProject="src\main\java">
			<property name="enableSubPackages" value="true" />
			<property name="trimStrings" value="true" />
		</javaModelGenerator>

		<!-- 生成sqlXML文件路径配置 -->
		<sqlMapGenerator targetPackage="my.mybatis.generator.auto.entity.xml"
			targetProject="src\main\java">
			<property name="enableSubPackages" value="true" />
		</sqlMapGenerator>

		<!-- 生成DAO的类文件路径配置 -->
		<javaClientGenerator targetPackage="my.mybatis.generator.auto.dao"
			targetProject="src\main\java" type="XMLMAPPER">
			<property name="enableSubPackages" value="true" />
		</javaClientGenerator>

		<!--要生成哪些表 -->
		<table tableName="t_user" domainObjectName="User"
			enableCountByExample="false" enableDeleteByExample="false"
			enableSelectByExample="false" enableUpdateByExample="false" />
	</context>
</generatorConfiguration>

小结

本文首先给出了一个使用MyBatis Generator产生代码的示例；而后，对其中能够自定义代码产生的部分给出了几个例子；至此，你们能够掌握自动产生代码的方法。

不过，如何让产生的类支持分页查询；或者，产生的Dao类能够继承基类等，都还不知足，限于篇幅，这些会在后续的文章中给出。