标签:name 改查 pwd public 增删 sqlSession Mybatis import id
1.新建一个maven项目,配置第三方库
<?xml version="1.0" encoding="UTF-8"?> <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>org.example</groupId> <artifactId>Mybatis03</artifactId> <packaging>pom</packaging> <version>1.0-SNAPSHOT</version> <modules> <module>Mybatis11</module> </modules> <dependencies> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.5.2</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.25</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.13</version> </dependency> </dependencies> </project>
2.编写mybatis-config.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <!--引用外部配置文件--> <properties resource="db.properties"/> <!--起别名--> <typeAliases> <typeAlias type="com.kuang.pojo.User" alias="User"/> </typeAliases> <environments default="development"> <environment id="development"> <transactionManager type="JDBC"/> <dataSource type="POOLED"> <property name="driver" value="${driver}"/> <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useLegacyDatetimeCode=false&serverTimezone=UTC"/> <property name="username" value="root"/> <property name="password" value="123456"/> </dataSource> </environment> </environments> <mappers> <mapper resource="userMapper.xml"/> </mappers> </configuration>
3.编写工具类
package com.kuang.utils; import org.apache.ibatis.io.Resources; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder; import java.io.IOException; import java.io.InputStream; public class MybatisUtils { private static SqlSessionFactory sqlSessionFactory; static { try { String resoure ="mybatis-config.xml"; InputStream resourceAsStream = Resources.getResourceAsStream(resoure); sqlSessionFactory=new SqlSessionFactoryBuilder().build(resourceAsStream); } catch (IOException e) { e.printStackTrace(); } } public static SqlSession getSqlSessiong(){ return sqlSessionFactory.openSession(); } }
4.编写实体类
package com.kuang.pojo; import org.apache.ibatis.type.Alias; //注解起别名 //@Alias("Hello1") public class User { private int id; private String name; private String pwd; public User() { } public User(int id, String name, String pwd) { this.id = id; this.name = name; this.pwd = pwd; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getPwd() { return pwd; } public void setPwd(String pwd) { this.pwd = pwd; } @Override public String toString() { return "User{" + "id=" + id + ", name='" + name + '\'' + ", pwd='" + pwd + '\'' + '}'; } }
5.编写接口
package com.kuang.dao; import java.util.List; import com.kuang.pojo.User; public interface UserDao { //查询全部用户 List<User> getUserList(); //根据id查询用户 User getUserById(int id); //insert一个用户 int addUser(User user); //update一个用户 int updatUser(User user); //删除一个用户 int deleteUser(int id); }
6.编写接口实现mapper
<?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="com.kuang.dao.UserDao"> <select id="getUserList" resultType="com.kuang.pojo.User"> select * from mybatis.user </select> <select id="getUserById" parameterType="int" resultType="User"> select * from mybatis.user where id = #{id} </select> <!--parameterType表示参数类型--> <insert id="addUser" parameterType="com.kuang.pojo.User"> insert into mybatis.user (id, name, pwd) value (#{id},#{name},#{pwd}) </insert> <update id="updatUser" parameterType="com.kuang.pojo.User"> update mybatis.user set name=#{name},pwd=#{pwd} where id=#{id}; </update> <delete id="deleteUser" parameterType="int"> delete from mybatis.user where id =#{id} </delete> </mapper>
7.编写测试单元测试
package com.kuang.dao; import com.kuang.utils.MybatisUtils; import org.apache.ibatis.session.SqlSession; import com.kuang.pojo.User; import org.junit.Test; import java.util.List; public class UserDaoTest { @Test public void test(){ SqlSession sqlSession = MybatisUtils.getSqlSessiong(); UserDao userDao = sqlSession.getMapper(UserDao.class); List<User> userList = userDao.getUserList(); for (User user : userList) { System.out.println(user); } sqlSession.close(); } //查询一个用户 @Test public void getUserId(){ SqlSession sqlSession = MybatisUtils.getSqlSessiong(); UserDao userDao = sqlSession.getMapper(UserDao.class); User userById = userDao.getUserById(1); System.out.println(userById); sqlSession.close(); } //新增一个用户 @Test public void addUser(){ SqlSession sqlSession = MybatisUtils.getSqlSessiong(); UserDao userDao = sqlSession.getMapper(UserDao.class); int i = userDao.addUser(new User(7, "dd", "wang")); if(i>0){ System.out.println("插入成功!"); } //提交事务 sqlSession.commit(); sqlSession.close(); } //update一个用户 @Test public void updateUser(){ SqlSession sqlSession = MybatisUtils.getSqlSessiong(); UserDao userDao = sqlSession.getMapper(UserDao.class); int i = userDao.updatUser(new User(1, "dd", "wang")); if(i>0){ System.out.println("更新成功!"); } //提交事务 sqlSession.commit(); sqlSession.close(); } @Test public void deleteUser(){ SqlSession sqlSession = MybatisUtils.getSqlSessiong(); UserDao userDao = sqlSession.getMapper(UserDao.class); int i = userDao.deleteUser(1); if(i>0){ System.out.println("删除成功!"); } //提交事务 sqlSession.commit(); sqlSession.close(); } @Test public void tee(){ System.out.println("ttt"); } }
标签:name,改查,pwd,public,增删,sqlSession,Mybatis,import,id 来源: https://www.cnblogs.com/trevain/p/15083101.html
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