Mybatis Generator可以幫助我們自動(dòng)生成很多結(jié)構(gòu)化的代碼，比如每張表對(duì)應(yīng)的Entity、Mapper接口和Xml文件，可以省去很多繁瑣的工作，今天通過本文給大家介紹Mybatis Generator的具體使用教程，感興趣的朋友一起看看吧

1、相關(guān)文件

關(guān)于Mybatis-Generator的下載可以到這個(gè)地址：https://github.com/mybatis/generator/releases

由于我使用的是Mysql數(shù)據(jù)庫(kù)，這里需要在準(zhǔn)備一個(gè)連接mysql數(shù)據(jù)庫(kù)的驅(qū)動(dòng)jar包

以下是相關(guān)文件截圖:

和Hibernate逆向生成一樣，這里也需要一個(gè)配置文件：

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>
    <!--數(shù)據(jù)庫(kù)驅(qū)動(dòng)-->
    <classPathEntry    location="mysql-connector-java-5.0.8-bin.jar"/>
    <context id="DB2Tables"    targetRuntime="MyBatis3">
        <commentGenerator>
            <property name="suppressDate" value="true"/>
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>
        <!--數(shù)據(jù)庫(kù)鏈接地址賬號(hào)密碼-->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost/mymessages" userId="root" password="root">
        </jdbcConnection>
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>
        <!--生成Model類存放位置-->
        <javaModelGenerator targetPackage="lcw.model" targetProject="src">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <!--生成映射文件存放位置-->
        <sqlMapGenerator targetPackage="lcw.mapping" targetProject="src">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>
        <!--生成Dao類存放位置-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="lcw.dao" targetProject="src">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>
        <!--生成對(duì)應(yīng)表及類名-->
        <table tableName="message" domainObjectName="Messgae" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
    </context>
</generatorConfiguration>

需要修改文件配置的地方我都已經(jīng)把注釋標(biāo)注出來了，這里的相關(guān)路徑（如數(shù)據(jù)庫(kù)驅(qū)動(dòng)包，生成對(duì)應(yīng)的相關(guān)文件位置可以自定義）不能帶有中文。

上面配置文件中的：

<table tableName="message" domainObjectName="Messgae" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>

tableName和domainObjectName為必選項(xiàng)，分別代表數(shù)據(jù)庫(kù)表名和生成的實(shí)力類名，其余的可以自定義去選擇（一般情況下均為false）。

生成語(yǔ)句文件：

java -jar mybatis-generator-core-1.3.2.jar -configfile generatorConfig.xml -overwrite

2、使用方法

在該目錄按住Shift鍵，右鍵鼠標(biāo)選擇"在此處打開命令窗口"，復(fù)制粘貼生成語(yǔ)句的文件代碼即可。

看下效果圖：

生成相關(guān)代碼：

Message.java

package lcw.model;
public class Messgae {
    private Integer id;
    private String title;
    private String describe;
    private String content;
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title == null ? null : title.trim();
    }
    public String getDescribe() {
        return describe;
    }
    public void setDescribe(String describe) {
        this.describe = describe == null ? null : describe.trim();
    }
    public String getContent() {
        return content;
    }
    public void setContent(String content) {
        this.content = content == null ? null : content.trim();
    }
}

MessgaeMapper.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="lcw.dao.MessgaeMapper" >
  <resultMap id="BaseResultMap" type="lcw.model.Messgae" >
    <id column="id" property="id" jdbcType="INTEGER" />
    <result column="title" property="title" jdbcType="VARCHAR" />
    <result column="describe" property="describe" jdbcType="VARCHAR" />
    <result column="content" property="content" jdbcType="VARCHAR" />
  </resultMap>
  <sql id="Base_Column_List" >
    id, title, describe, content
  </sql>
  <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
    select
    <include refid="Base_Column_List" />
    from message
    where id = #{id,jdbcType=INTEGER}
  </select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
    delete from message
    where id = #{id,jdbcType=INTEGER}
  </delete>
  <insert id="insert" parameterType="lcw.model.Messgae" >
    insert into message (id, title, describe,
      content)
    values (#{id,jdbcType=INTEGER}, #{title,jdbcType=VARCHAR}, #{describe,jdbcType=VARCHAR},
      #{content,jdbcType=VARCHAR})
  </insert>
  <insert id="insertSelective" parameterType="lcw.model.Messgae" >
    insert into message
    <trim prefix="(" suffix=")" suffixOverrides="," >
      <if test="id != null" >
        id,
      </if>
      <if test="title != null" >
        title,
      </if>
      <if test="describe != null" >
        describe,
      </if>
      <if test="content != null" >
        content,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides="," >
      <if test="id != null" >
        #{id,jdbcType=INTEGER},
      </if>
      <if test="title != null" >
        #{title,jdbcType=VARCHAR},
      </if>
      <if test="describe != null" >
        #{describe,jdbcType=VARCHAR},
      </if>
      <if test="content != null" >
        #{content,jdbcType=VARCHAR},
      </if>
    </trim>
  </insert>
  <update id="updateByPrimaryKeySelective" parameterType="lcw.model.Messgae" >
    update message
    <set >
      <if test="title != null" >
        title = #{title,jdbcType=VARCHAR},
      </if>
      <if test="describe != null" >
        describe = #{describe,jdbcType=VARCHAR},
      </if>
      <if test="content != null" >
        content = #{content,jdbcType=VARCHAR},
      </if>
    </set>
    where id = #{id,jdbcType=INTEGER}
  </update>
  <update id="updateByPrimaryKey" parameterType="lcw.model.Messgae" >
    update message
    set title = #{title,jdbcType=VARCHAR},
      describe = #{describe,jdbcType=VARCHAR},
      content = #{content,jdbcType=VARCHAR}
    where id = #{id,jdbcType=INTEGER}
  </update>
</mapper>

MessgaeMapper.java

package lcw.dao;
import lcw.model.Messgae;
public interface MessgaeMapper {
    int deleteByPrimaryKey(Integer id);
    int insert(Messgae record);
    int insertSelective(Messgae record);
    Messgae selectByPrimaryKey(Integer id);
    int updateByPrimaryKeySelective(Messgae record);
    int updateByPrimaryKey(Messgae record);
}

到此這篇關(guān)于詳解Mybatis Generator的具體使用教程的文章就介紹到這了,更多相關(guān)Mybatis Generator使用內(nèi)容請(qǐng)搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！

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