\u63d0\u4f9b\u6620\u5c04\u6807\u7b7e，\u652f\u6301\u5bf9\u8c61\u4e0e\u6570\u636e\u5e93\u7684 ORM \u5b57\u6bb5\u5173\u7cfb\u6620\u5c04\u3002<\/li>\n<\/ul>\n\u7b80\u5355\u8bf4<\/span>：\u7528 MyBatis \u5199\u6570\u636e\u5e93\u64cd\u4f5c，\u66f4\u7b80\u5355\u3001\u66f4\u7075\u6d3b<\/p>\n\u4e8c\u3001MyBatis \u6838\u5fc3\u6982\u5ff5（\u901a\u4fd7\u7406\u89e3）<\/h2>\n1.SqlSessionFactory<\/h3>\n\n- \u6570\u636e\u5e93\u8fde\u63a5\u7684 \u201c\u5de5\u5382\u201d，\u901a\u8fc7\u6838\u5fc3\u914d\u7f6e\u6587\u4ef6\u521b\u5efa<\/li>\n
- \u4f5c\u7528：\u751f\u4ea7SqlSession（\u7c7b\u4f3c\u751f\u4ea7 \u201c\u6570\u636e\u5e93\u8fde\u63a5\u201d，\u540c\u6837\u4e5f\u9700\u8981\u5173\u95ed\u8d44\u6e90）<\/li>\n<\/ul>\n
2.SqlSession<\/h3>\n\n- \u6570\u636e\u5e93\u4f1a\u8bdd\u5bf9\u8c61，\u76f8\u5f53\u4e8e\u201c\u6570\u636e\u5e93\u8fde\u63a5\u201d<\/li>\n
- \u4f5c\u7528：\u83b7\u53d6Mapper\u63a5\u53e3，\u6267\u884cSQL\u64cd\u4f5c<\/li>\n<\/ul>\n
3.Mapper\u63a5\u53e3<\/h3>\n\n- \u5b9a\u4e49\u6570\u636e\u5e93\u64cd\u4f5c\u65b9\u6cd5（\u5982 selectUserById\u3001insertUser）<\/li>\n
- \u65e0\u9700\u5b9e\u73b0\u7c7b，MyBatis \u4f1a\u81ea\u52a8\u751f\u6210\u4ee3\u7406\u5bf9\u8c61<\/li>\n<\/ul>\n
4.\u6620\u5c04\u6587\u4ef6（XML）<\/h3>\n\n- \u5b58\u653e SQL \u8bed\u53e5，\u4e0e Mapper \u63a5\u53e3\u4e00\u4e00\u5bf9\u5e94<\/li>\n
- \u901a\u8fc7\u6807\u7b7e（select\/insert \u7b49）\u7ed1\u5b9a\u63a5\u53e3\u65b9\u6cd5<\/li>\n<\/ul>\n
\u4e09\u3001\u624b\u628a\u624b\u642d\u5efa\u7b2c\u4e00\u4e2a MyBatis \u9879\u76ee<\/h2>\n1. \u51c6\u5907\u5de5\u4f5c<\/h3>\n
\u6570\u636e\u5e93：MySQL，\u521b\u5efa user \u8868（\u9644\u5efa\u8868 SQL）：<\/p>\n
CREATE TABLE `user` (
\n `id` int(11) PRIMARY KEY AUTO_INCREMENT,
\n `username` varchar(50) NOT NULL,
\n `age` int(3) DEFAULT NULL,
\n `create_time` datetime DEFAULT NULL
\n) ENGINE=InnoDB DEFAULT CHARSET=utf8; <\/p>\n
\u9879\u76ee：Maven \u5de5\u7a0b，\u5f15\u5165\u4f9d\u8d56（pom.xml）：<\/p>\n
<!– MyBatis \u6838\u5fc3\u5305 –>
\n<dependency>
\n <groupId>org.mybatis<\/groupId>
\n <artifactId>mybatis<\/artifactId>
\n <version>3.5.10<\/version>
\n<\/dependency>
\n<!– MySQL \u9a71\u52a8 –>
\n<dependency>
\n <groupId>mysql<\/groupId>
\n <artifactId>mysql-connector-java<\/artifactId>
\n <version>8.0.30<\/version>
\n<\/dependency> <\/p>\n
2. \u6838\u5fc3\u914d\u7f6e\u6587\u4ef6（mybatis-config.xml）<\/h3>\n
\u653e\u5728 resources \u76ee\u5f55\u4e0b，\u914d\u7f6e\u6570\u636e\u5e93\u8fde\u63a5\u548c\u6620\u5c04\u6587\u4ef6\u8def\u5f84：<\/p>\n
<?xml version="1.0" encoding="UTF-8" ?>
\n<!DOCTYPE configuration PUBLIC "-\/\/mybatis.org\/\/DTD Config 3.0\/\/EN"
\n "http:\/\/mybatis.org\/dtd\/mybatis-3-config.dtd">
\n<configuration>
\n <environments default="development">
\n <environment id="development">
\n <!– \u4e8b\u52a1\u7ba1\u7406：JDBC \u65b9\u5f0f –>
\n <transactionManager type="JDBC"\/>
\n <!– \u6570\u636e\u6e90：\u8fde\u63a5\u6c60\u65b9\u5f0f –>
\n <dataSource type="POOLED">
\n <property name="driver" value="com.mysql.cj.jdbc.Driver"\/>
\n <property name="url" value="jdbc:mysql:\/\/localhost:3306\/mybatis_demo?useSSL=false"\/>
\n <property name="username" value="root"\/> <!– \u4f60\u7684\u6570\u636e\u5e93\u7528\u6237\u540d –>
\n <property name="password" value="123456"\/> <!– \u4f60\u7684\u6570\u636e\u5e93\u5bc6\u7801 –>
\n <\/dataSource>
\n <\/environment>
\n <\/environments><\/p>\n
<!– \u6620\u5c04\u6587\u4ef6\u8def\u5f84：\u6307\u5b9a Mapper XML \u4f4d\u7f6e –>
\n <mappers>
\n <mapper resource="mapper\/UserMapper.xml"\/>
\n <\/mappers>
\n<\/configuration> <\/p>\n
3. \u7f16\u5199\u5b9e\u4f53\u7c7b（User.java）<\/h3>\n
\u5c5e\u6027\u4e0e\u8868\u5b57\u6bb5\u5bf9\u5e94（\u5efa\u8bae\u7528\u9a7c\u5cf0\u547d\u540d，\u5982 createTime \u5bf9\u5e94\u8868 create_time）：<\/p>\n
public class User {
\n private Integer id;
\n private String username;
\n private Integer age;
\n private LocalDateTime createTime;<\/p>\n
\/\/ \u7701\u7565 getter\u3001setter\u3001toString \u65b9\u6cd5
\n} <\/p>\n
4. \u7f16\u5199 Mapper \u63a5\u53e3（UserMapper.java）<\/h3>\n
\u5b9a\u4e49\u6570\u636e\u5e93\u64cd\u4f5c\u65b9\u6cd5：<\/p>\n
public interface UserMapper {<\/p>\n
\/\/\u67e5\u8be2\u6240\u6709\u7528\u6237
\n List<User> selectAllUser();<\/p>\n
\/\/ \u6839\u636e ID \u67e5\u8be2\u7528\u6237
\n User selectById(Integer id);<\/p>\n
\/\/ \u65b0\u589e\u7528\u6237
\n int insert(User user);<\/p>\n
\/\/ \u6839\u636e ID \u4fee\u6539\u7528\u6237
\n int updateById(User user);<\/p>\n
\/\/ \u6839\u636e ID \u5220\u9664\u7528\u6237
\n int deleteById(Integer id);
\n} <\/p>\n
5. \u7f16\u5199\u6620\u5c04\u6587\u4ef6(UserMapper.xml)<\/h3>\n
\u653e\u5728 resources\/mapper \u76ee\u5f55\u4e0b，\u7ed1\u5b9a Mapper \u63a5\u53e3\u5e76\u5199 SQL：<\/p>\n
<?xml version="1.0" encoding="UTF-8" ?>
\n<!DOCTYPE mapper PUBLIC "-\/\/mybatis.org\/\/DTD Mapper 3.0\/\/EN"
\n "http:\/\/mybatis.org\/dtd\/mybatis-3-mapper.dtd">
\n<!– namespace \u5fc5\u987b\u4e0e Mapper \u63a5\u53e3\u5168\u7c7b\u540d\u4e00\u81f4 –>
\n<mapper namespace="com.example.mapper.UserMapper"><\/p>\n
<!– \u67e5\u8be2：id \u4e0e\u63a5\u53e3\u65b9\u6cd5\u540d\u4e00\u81f4，resultType \u662f\u8fd4\u56de\u7c7b\u578b –>
\n <select id="selectById" resultType="com.example.pojo.User">
\n select * from user where id = #{id}
\n <\/select><\/p>\n
<!– \u65b0\u589e：useGeneratedKeys \u83b7\u53d6\u81ea\u589e\u4e3b\u952e，keyProperty \u7ed1\u5b9a\u5b9e\u4f53\u7c7b\u5c5e\u6027 –>
\n <insert id="insert" useGeneratedKeys="true" keyProperty="id">
\n insert into user(username, age, create_time)
\n values(#{username}, #{age}, #{createTime})
\n <\/insert><\/p>\n
<!– \u4fee\u6539 –>
\n <update id="updateById">
\n update user set
\n username = #{username},
\n age = #{age}
\n where id = #{id}
\n <\/update><\/p>\n
<!– \u5220\u9664 –>
\n <delete id="deleteById">
\n delete from user where id = #{id}
\n <\/delete>
\n<\/mapper> <\/p>\n
#{}\u662f\u4e00\u79cd\u5e38\u89c1\u7684\u5360\u4f4d\u7b26\u8bed\u6cd5， \u7528\u4e8e\u5c06\u53d8\u91cf\u6216\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\u5d4c\u5165\u5230\u53cc\u5f15\u53f7\/\u5355\u5f15\u53f7\u5b57\u7b26\u4e32\u4e2d，\u81ea\u52a8\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u7c7b\u578b\u3002（\u80fd\u591f\u6709\u6548\u9632\u6b62sql\u6ce8\u5165\u95ee\u9898）<\/p>\n
6. \u7f16\u5199\u6d4b\u8bd5\u7c7b（MyBatisTest.java）<\/h3>\n
\u901a\u8fc7SqlSession\u6267\u884c\u64cd\u4f5c：<\/p>\n
public class MyBatisTest {
\n public static void main(String[] args) throws IOException {
\n \/\/ 1. \u8bfb\u53d6\u6838\u5fc3\u914d\u7f6e\u6587\u4ef6
\n InputStream is = Resources.getResourceAsStream("mybatis-config.xml");<\/p>\n
\/\/ 2. \u521b\u5efa SqlSessionFactory
\n SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(is);<\/p>\n
\/\/ 3. \u83b7\u53d6 SqlSession（true \u8868\u793a\u81ea\u52a8\u63d0\u4ea4\u4e8b\u52a1）
\n SqlSession session = factory.openSession(true);<\/p>\n
\/\/ 4. \u83b7\u53d6 Mapper \u63a5\u53e3\u4ee3\u7406\u5bf9\u8c61
\n UserMapper userMapper = session.getMapper(UserMapper.class);<\/p>\n
\/\/ 5. \u6267\u884c SQL \u64cd\u4f5c
\n \/\/ \u65b0\u589e\u7528\u6237
\n User user = new User();
\n user.setUsername("\u5f20\u4e09");
\n user.setAge(20);
\n user.setCreateTime(LocalDateTime.now());
\n int insert = userMapper.insert(user);
\n System.out.println("\u65b0\u589e\u6210\u529f，\u5f71\u54cd\u884c\u6570：" + insert);
\n System.out.println("\u65b0\u589e\u7684\u7528\u6237 ID：" + user.getId()); \/\/ \u81ea\u589e ID \u4f1a\u56de\u663e<\/p>\n
\/\/ \u67e5\u8be2\u7528\u6237（\u7528\u4e0a\u9762\u65b0\u589e\u7684 ID）
\n User queryUser = userMapper.selectById(user.getId());
\n System.out.println("\u67e5\u8be2\u7ed3\u679c：" + queryUser);<\/p>\n
\/\/ \u4fee\u6539\u7528\u6237
\n queryUser.setAge(21);
\n int update = userMapper.updateById(queryUser);
\n System.out.println("\u4fee\u6539\u6210\u529f，\u5f71\u54cd\u884c\u6570：" + update);<\/p>\n
\/\/ \u5220\u9664\u7528\u6237
\n int delete = userMapper.deleteById(user.getId());
\n System.out.println("\u5220\u9664\u6210\u529f，\u5f71\u54cd\u884c\u6570：" + delete);<\/p>\n
\/\/ 6. \u5173\u95ed\u4f1a\u8bdd
\n session.close();
\n }
\n} <\/p>\n
\u56db\u3001\u6838\u5fc3\u77e5\u8bc6\u70b9\u603b\u7ed3<\/h2>\n1.\u53c2\u6570\u4f20\u9012<\/h3>\n\n- \u5355\u4e2a\u53c2\u6570：\u76f4\u63a5\u7528 #{\u53c2\u6570\u540d}（\u5982 #{id}）<\/li>\n
- \u591a\u4e2a\u53c2\u6570：\u6709\u4e24\u79cd\u65b9\u6cd5：（1）\u4f20\u5165\u53c2\u6570\u65f6\u653e\u5165Map\u952e\u503c\u5bf9，\u901a\u8fc7\u952e\u540d\u8bbf\u95ee\u503c，\u8fbe\u5230\u4f20\u5165\u591a\u4e2a\u53c2\u6570\u7684\u76ee\u7684；（2）\u4f20\u5165\u53c2\u6570\u65f6\u5c06\u8981\u4f20\u5165\u7684\u503c\u5c01\u88c5\u5230\u5b9e\u4f53\u7c7b\u4e2d，\u901a\u8fc7\u8bbf\u95ee\u5b9e\u4f53\u7c7b\u5c5e\u6027\u540d\u4f20\u5165\u591a\u4e2a\u53c2\u6570<\/li>\n
- \u5b9e\u4f53\u7c7b\u53c2\u6570：\u7528 #{\u5c5e\u6027\u540d}（\u5982 #{username} \u5bf9\u5e94 user.getUsername()）<\/li>\n<\/ul>\n
2.\u7ed3\u679c\u6620\u5c04<\/h3>\n\n- \u8868\u5b57\u6bb5\u4e0e\u5b9e\u4f53\u5c5e\u6027\u540d\u4e00\u81f4：\u7528 resultType \u76f4\u63a5\u6307\u5b9a\u5b9e\u4f53\u7c7b<\/li>\n
- \u7b26\u5408Mybatis\u5b9a\u4e49\u6620\u5c04\u89c4\u5219：\u7528 resultType \u76f4\u63a5\u6307\u5b9a\u5b9e\u4f53\u7c7b，\u5e76\u4e14\u5728mybatis-config.xml\u91cc\u9762\u914d\u7f6e\u9a7c\u5cf0\u6620\u5c04<\/li>\n
- \u4e0d\u4e00\u81f4：\u7528 resultMap \u624b\u52a8\u6620\u5c04<\/li>\n<\/ul>\n
<settings>
\n <!–\u5c06\u6570\u636e\u5e93\u4e2d\u7684\u4e0b\u5212\u7ebf\u6620\u5c04\u4e3a\u9a7c\u5cf0–>
\n <setting name="mapUnderscoreToCamelCase" value="true"\/>
\n<\/settings> <\/p>\n
\u4f4d\u7f6e\u653e\u4e8emybatis-config.xml\u4e2d<environments>\u524d<\/p>\n
<resultMap id="userMap" type="com.example.pojo.User">
\n <id column="id" property="id"\/> <!– \u4e3b\u952e –>
\n <result column="username" property="username"\/>
\n <result column="age" property="age"\/>
\n <result column="create_time" property="createTime"\/> <!– \u5b57\u6bb5\u4e0e\u5c5e\u6027\u6620\u5c04 –>
\n<\/resultMap> <\/p>\n
<\/h3>\n<\/h2>\n","protected":false},"excerpt":{"rendered":"
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