由於MyBatis屬於一種半自動的ORM框架，所以主要的工作將是書寫Mapping映射文件，但是由於手寫映射文件很容易出錯，所以查資料發現有現成的工具可以自動生成底層模型類、Dao接口類甚至Mapping映射文件。

一、建立表結構

CREATE TABLE `user` (
`id` varchar(50) NOT NULL,
`username` varchar(18) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL,
`password` varchar(18) DEFAULT NULL,
`email` varchar(50) DEFAULT NULL,
`name` varchar(18) DEFAULT NULL,
`sex` varchar(2) DEFAULT NULL,
`birthday` varchar(50) DEFAULT NULL,
`address` varchar(500) DEFAULT NULL,
`tel` varchar(18) DEFAULT NULL,
`qq` varchar(18) DEFAULT NULL,
`image` varchar(50) DEFAULT NULL,
`sfjh` varchar(1) DEFAULT NULL,
`sfzx` varchar(1) DEFAULT NULL,
`sfhf` varchar(1) DEFAULT NULL,
`sfpl` varchar(1) DEFAULT NULL,
`sffx` varchar(1) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf-8;

二、下載mybatis-generator-core

進入：http://code.google.com/p/mybatis/

選擇Downloads，再選擇MyBatis Generator Tool下載即可。

三、生成配置文件

新建一個空的XML配置文件，名稱可以隨便取，這裏以generatorConfig.xml為名。最好將這個文件放在下載後的lib目錄中，如圖：

其中mysql的驅動可以隨便放在非中文路徑的地方，這裏為了方便就放在lib目錄下。

自動生成最重要的就是配置文件的書寫，現在就開始介紹generatorConfig.xml這個文件的具體內容：

1. <?xml version="1.0" encoding="UTF-8"?>
2. <!DOCTYPE generatorConfiguration
3. PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
4. "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
5. <generatorConfiguration>
6. <!-- 數據庫驅動-->
7. <classPathEntry location="mysql-connector-java-5.0.6-bin.jar"/>
8. <context id="DB2Tables" targetRuntime="MyBatis3">
9. <commentGenerator>
10. <property name="suppressDate" value="true"/>
11. <!-- 是否去除自動生成的註釋 true：是 ： false:否 -->
12. <property name="suppressAllComments" value="true"/>
13. </commentGenerator>
14. <!--數據庫鏈接URL，用戶名、密碼 -->
15. <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost/test" userId="test" password="test">
16. </jdbcConnection>
17. <javaTypeResolver>
18. <property name="forceBigDecimals" value="false"/>
19. </javaTypeResolver>
20. <!-- 生成模型的包名和位置-->
21. <javaModelGenerator targetPackage="test.model" targetProject="src">
22. <property name="enableSubPackages" value="true"/>
23. <property name="trimStrings" value="true"/>
24. </javaModelGenerator>
25. <!-- 生成映射文件的包名和位置-->
26. <sqlMapGenerator targetPackage="test.mapping" targetProject="src">
27. <property name="enableSubPackages" value="true"/>
28. </sqlMapGenerator>
29. <!-- 生成DAO的包名和位置-->
30. <javaClientGenerator type="XMLMAPPER" targetPackage="test.dao" targetProject="src">
31. <property name="enableSubPackages" value="true"/>
32. </javaClientGenerator>
33. <!-- 要生成哪些表-->
34. <table tableName="about" domainObjectName="AboutDto" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
35. <table tableName="user" domainObjectName="UserDto" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
36. <table tableName="syslogs" domainObjectName="SyslogsDto" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
37. </context>
38. </generatorConfiguration>

1、其中需要註意的有數據庫驅動、數據庫URL、用戶名、密碼、生成模型的包名和位置、生成映射文件的包名和位置、生成DAO的包名和位置以及最後需要生成的表名和對應的類名。

四、運行

需要通過CMD命令行方式來運行，首先可以先準備一個運行的腳本，這裏使用的腳本是：java -jar mybatis-generator-core-1.3.2.jar -configfile generatorConfig.xml -overwrite

需要註意的是：mybatis-generator-core-1.3.2.jar為下載的對應版本的jar，generatorConfig.xml 為配置文件名，如果不為這個可以在這裏進行修改。

啟動cmd進入到“F:\soft\mybatis-generator-core-1.3.2\lib”這個目錄下，如圖：

生成成功後進到src目錄下，可以看到已經生成了對應的model、dao、mapping，如圖：

下面可以看看生成後的UserMapper.xml

1. <?xml version="1.0" encoding="UTF-8" ?>
2. <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
3. <mapper namespace="test.dao.UserDtoMapper" >
4. <resultMap id="BaseResultMap" type="test.model.UserDto" >
5. <id column="id" property="id" jdbcType="VARCHAR" />
6. <result column="username" property="username" jdbcType="VARCHAR" />
7. <result column="password" property="password" jdbcType="VARCHAR" />
8. <result column="email" property="email" jdbcType="VARCHAR" />
9. <result column="name" property="name" jdbcType="VARCHAR" />
10. <result column="sex" property="sex" jdbcType="VARCHAR" />
11. <result column="birthday" property="birthday" jdbcType="VARCHAR" />
12. <result column="address" property="address" jdbcType="VARCHAR" />
13. <result column="tel" property="tel" jdbcType="VARCHAR" />
14. <result column="qq" property="qq" jdbcType="VARCHAR" />
15. <result column="image" property="image" jdbcType="VARCHAR" />
16. <result column="sfjh" property="sfjh" jdbcType="VARCHAR" />
17. <result column="sfzx" property="sfzx" jdbcType="VARCHAR" />
18. <result column="sfhf" property="sfhf" jdbcType="VARCHAR" />
19. <result column="sfpl" property="sfpl" jdbcType="VARCHAR" />
20. <result column="sffx" property="sffx" jdbcType="VARCHAR" />
21. </resultMap>
22. <sql id="Base_Column_List" >
23. id, username, password, email, name, sex, birthday, address, tel, qq, image, sfjh,
24. sfzx, sfhf, sfpl, sffx
25. </sql>
26. <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.String" >
27. select
28. <include refid="Base_Column_List" />
29. from user
30. where id = #{id,jdbcType=VARCHAR}
31. </select>
32. <delete id="deleteByPrimaryKey" parameterType="java.lang.String" >
33. delete from user
34. where id = #{id,jdbcType=VARCHAR}
35. </delete>
36. <insert id="insert" parameterType="test.model.UserDto" >
37. insert into user (id, username, password,
38. email, name, sex, birthday,
39. address, tel, qq, image,
40. sfjh, sfzx, sfhf, sfpl,
41. sffx)
42. values (#{id,jdbcType=VARCHAR}, #{username,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR},
43. #{email,jdbcType=VARCHAR}, #{name,jdbcType=VARCHAR}, #{sex,jdbcType=VARCHAR}, #{birthday,jdbcType=VARCHAR},
44. #{address,jdbcType=VARCHAR}, #{tel,jdbcType=VARCHAR}, #{qq,jdbcType=VARCHAR}, #{image,jdbcType=VARCHAR},
45. #{sfjh,jdbcType=VARCHAR}, #{sfzx,jdbcType=VARCHAR}, #{sfhf,jdbcType=VARCHAR}, #{sfpl,jdbcType=VARCHAR},
46. #{sffx,jdbcType=VARCHAR})
47. </insert>
48. <insert id="insertSelective" parameterType="test.model.UserDto" >
49. insert into user
50. <trim prefix="(" suffix=")" suffixOverrides="," >
51. <if test="id != null" >
52. id,
53. </if>
54. <if test="username != null" >
55. username,
56. </if>
57. <if test="password != null" >
58. password,
59. </if>
60. <if test="email != null" >
61. email,
62. </if>
63. <if test="name != null" >
64. name,
65. </if>
66. <if test="sex != null" >
67. sex,
68. </if>
69. <if test="birthday != null" >
70. birthday,
71. </if>
72. <if test="address != null" >
73. address,
74. </if>
75. <if test="tel != null" >
76. tel,
77. </if>
78. <if test="qq != null" >
79. qq,
80. </if>
81. <if test="image != null" >
82. image,
83. </if>
84. <if test="sfjh != null" >
85. sfjh,
86. </if>
87. <if test="sfzx != null" >
88. sfzx,
89. </if>
90. <if test="sfhf != null" >
91. sfhf,
92. </if>
93. <if test="sfpl != null" >
94. sfpl,
95. </if>
96. <if test="sffx != null" >
97. sffx,
98. </if>
99. </trim>
100. <trim prefix="values (" suffix=")" suffixOverrides="," >
101. <if test="id != null" >
102. #{id,jdbcType=VARCHAR},
103. </if>
104. <if test="username != null" >
105. #{username,jdbcType=VARCHAR},
106. </if>
107. <if test="password != null" >
108. #{password,jdbcType=VARCHAR},
109. </if>
110. <if test="email != null" >
111. #{email,jdbcType=VARCHAR},
112. </if>
113. <if test="name != null" >
114. #{name,jdbcType=VARCHAR},
115. </if>
116. <if test="sex != null" >
117. #{sex,jdbcType=VARCHAR},
118. </if>
119. <if test="birthday != null" >
120. #{birthday,jdbcType=VARCHAR},
121. </if>
122. <if test="address != null" >
123. #{address,jdbcType=VARCHAR},
124. </if>
125. <if test="tel != null" >
126. #{tel,jdbcType=VARCHAR},
127. </if>
128. <if test="qq != null" >
129. #{qq,jdbcType=VARCHAR},
130. </if>
131. <if test="image != null" >
132. #{image,jdbcType=VARCHAR},
133. </if>
134. <if test="sfjh != null" >
135. #{sfjh,jdbcType=VARCHAR},
136. </if>
137. <if test="sfzx != null" >
138. #{sfzx,jdbcType=VARCHAR},
139. </if>
140. <if test="sfhf != null" >
141. #{sfhf,jdbcType=VARCHAR},
142. </if>
143. <if test="sfpl != null" >
144. #{sfpl,jdbcType=VARCHAR},
145. </if>
146. <if test="sffx != null" >
147. #{sffx,jdbcType=VARCHAR},
148. </if>
149. </trim>
150. </insert>
151. <update id="updateByPrimaryKeySelective" parameterType="test.model.UserDto" >
152. update user
153. <set >
154. <if test="username != null" >
155. username = #{username,jdbcType=VARCHAR},
156. </if>
157. <if test="password != null" >
158. password = #{password,jdbcType=VARCHAR},
159. </if>
160. <if test="email != null" >
161. email = #{email,jdbcType=VARCHAR},
162. </if>
163. <if test="name != null" >
164. name = #{name,jdbcType=VARCHAR},
165. </if>
166. <if test="sex != null" >
167. sex = #{sex,jdbcType=VARCHAR},
168. </if>
169. <if test="birthday != null" >
170. birthday = #{birthday,jdbcType=VARCHAR},
171. </if>
172. <if test="address != null" >
173. address = #{address,jdbcType=VARCHAR},
174. </if>
175. <if test="tel != null" >
176. tel = #{tel,jdbcType=VARCHAR},
177. </if>
178. <if test="qq != null" >
179. qq = #{qq,jdbcType=VARCHAR},
180. </if>
181. <if test="image != null" >
182. image = #{image,jdbcType=VARCHAR},
183. </if>
184. <if test="sfjh != null" >
185. sfjh = #{sfjh,jdbcType=VARCHAR},
186. </if>
187. <if test="sfzx != null" >
188. sfzx = #{sfzx,jdbcType=VARCHAR},
189. </if>
190. <if test="sfhf != null" >
191. sfhf = #{sfhf,jdbcType=VARCHAR},
192. </if>
193. <if test="sfpl != null" >
194. sfpl = #{sfpl,jdbcType=VARCHAR},
195. </if>
196. <if test="sffx != null" >
197. sffx = #{sffx,jdbcType=VARCHAR},
198. </if>
199. </set>
200. where id = #{id,jdbcType=VARCHAR}
201. </update>
202. <update id="updateByPrimaryKey" parameterType="test.model.UserDto" >
203. update user
204. set username = #{username,jdbcType=VARCHAR},
205. password = #{password,jdbcType=VARCHAR},
206. email = #{email,jdbcType=VARCHAR},
207. name = #{name,jdbcType=VARCHAR},
208. sex = #{sex,jdbcType=VARCHAR},
209. birthday = #{birthday,jdbcType=VARCHAR},
210. address = #{address,jdbcType=VARCHAR},
211. tel = #{tel,jdbcType=VARCHAR},
212. qq = #{qq,jdbcType=VARCHAR},
213. image = #{image,jdbcType=VARCHAR},
214. sfjh = #{sfjh,jdbcType=VARCHAR},
215. sfzx = #{sfzx,jdbcType=VARCHAR},
216. sfhf = #{sfhf,jdbcType=VARCHAR},
217. sfpl = #{sfpl,jdbcType=VARCHAR},
218. sffx = #{sffx,jdbcType=VARCHAR}
219. where id = #{id,jdbcType=VARCHAR}
220. </update>
221. </mapper>

接下來就可以將這三個目錄拷貝到對應項目的目錄中，如果需要新增自己的方法可以修改dao類。

MyBatis學習4---使用MyBatis_Generator生成Dto、Dao、Mapping