2018.10.14 MyBatis配置实现对用户的增删改查
2024-08-30 21:25:33
记得导入对应的Jar包
ant-1.9.6.jar
ant-launcher-1.9.6.jar
asm-5.2.jar
cglib-3.2.5.jar
commons-logging-1.2.jar
javassist-3.22.0-GA.jar
log4j-1.2.17.jar
log4j-api-2.3.jar
log4j-core-2.3.jar
mybatis-3.4.6.jar
mysql-connector-java.jar
ognl-3.1.16.jar
slf4j-api-1.7.25.jar
slf4j-log4j12-1.7.25.jar
xml文件实现自动提示 先导入dtd的约束在jar包里面有：mybatis-3.4.6.jar ----> org.apache.ibatis.builder---->xml文件夹------>有两个以dtd结尾的文件，复制出来导如eclipse中
加入头部信息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">
加入头部信息config
<?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">
在src目录下面创建一个SqlMapConfig.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>
<!-- 和spring整合后 environments配置将废除-->
<environments default="development">
<environment id="development">
<!-- 使用jdbc事务管理-->
<transactionManager type="JDBC" />
<!-- 数据库连接池-->
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/mybaits?characterEncoding=utf-8" />
<property name="username" value="root" />
<property name="password" value="123456" />
</dataSource>
</environment>
</environments>
<!-- 加载po映射文件 -->
<!-- <mappers>
<mapper resource="com/mybatis/po/User.xml"/>
</mappers> -->
<!-- 动态代理模式 加载mapper映射文件 -->
<mappers>
<mapper resource="com/mybatis/mapper/UserMapper.xml"/>
</mappers>
</configuration>
创建日志信息文件 log4j.properties
### 设置###
log4j.rootLogger = debug,stdout,D,E
### 输出信息到控制抬 ###
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n
### 输出DEBUG 级别以上的日志到=E://logs/error.log ###
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.File = E://logs/log.log
log4j.appender.D.Append = true
log4j.appender.D.Threshold = DEBUG
log4j.appender.D.layout = org.apache.log4j.PatternLayout
log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n
### 输出ERROR 级别以上的日志到=E://logs/error.log ###
log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
log4j.appender.E.File =E://logs/error.log
log4j.appender.E.Append = true
log4j.appender.E.Threshold = ERROR
log4j.appender.E.layout = org.apache.log4j.PatternLayout
log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n
创建实体对象
package com.mybatis.po;
import java.io.Serializable;
import java.util.Date;
public class User implements Serializable {
private int id;
private String username;// 用户姓名
private String sex;// 性别
private Date birthday;// 生日
private String address;// 地址
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return "User [id=" + id + ", username=" + username + ", sex=" + sex
+ ", birthday=" + birthday + ", address=" + address + "]";
}
}
UserMapper.java是一个接口
package com.mybatis.mapper;
import java.util.List;
import com.mybatis.po.User;
public interface UserMapper {
//根据Id查找对象
public User findUserById(int id) throws Exception;
//模糊查找
public List<User> findUserByLikeName(String username) throws Exception;
//添加对象
public void addUser(User user) throws Exception;
//修改对象
public void updateUser(User user) throws Exception;
}
UserMapper.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">
<!-- 动态代理之后写的是接口名加包名 -->
<mapper namespace="com.mybatis.mapper.UserMapper">
<!--
查询操作
根据id查询用户对象
public User findUserById(int id){}
-->
<select id="findUserById" parameterType="int" resultType="com.mybatis.po.User">
select * from user where id=#{id}
</select>
<!-- 模糊查询 根据名字 返回的是集合对象 -->
<select id="findUserByLikeName" parameterType="java.lang.String" resultType="com.mybatis.po.User">
select * from user where username like '%${value}%'
</select>
<!-- 插入操作 -->
<insert id="insertUser" parameterType="com.mybatis.po.User">
<!-- 主键映射 -->
<selectKey keyProperty="id" order="AFTER" resultType="int">
select LAST_INSERT_ID()
</selectKey>
insert into user(username,birthday,sex,address) values(#{username},#{birthday},#{sex},#{address})
</insert>
<!-- 修改操作 -->
<update id="updateUser" parameterType="com.mybatis.po.User">
<!-- update user set username='小五' where id=1; -->
update user set username=#{username},birthday=#{birthday},sex=#{sex},address=#{address} where id=#{id}
</update>
<!-- 删除操作 -->
<delete id="delUser" parameterType="int">
delete from user where id=#{id}
</delete>
</mapper>
Test测试
package com.mybatis.test;
import java.util.Date;
import java.util.List;
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 org.junit.Before;
import org.junit.Test;
import com.mybatis.mapper.UserMapper;
import com.mybatis.po.User;
public class TestMapper {
//定义工厂对象
private SqlSessionFactory sqlSessionFactory;
@Before
public void testCreateSqlsessionFactory()throws Exception {
//创建sqlsession工厂
sqlSessionFactory = new SqlSessionFactoryBuilder().build(Resources.getResourceAsStream("SqlMapConfig.xml"));
}
//根据Id查询用户对象
@Test
public void testFindUserById() {
//通过工厂对象生成sqlsession对象
SqlSession session = sqlSessionFactory.openSession();
UserMapper userMapper = session.getMapper(UserMapper.class);
try {
User user = userMapper.findUserById(10);
System.out.println(user);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//User user = session.selectOne("test.findUserById",10);//只能查询一条记录
//System.out.println(user);
session.close();
}
//模糊查询 根据名字
@Test
public void testFindUserByLikeName() {
//通过工厂对象生成sqlsession对象
SqlSession session = sqlSessionFactory.openSession();
//根据反射
UserMapper userMapper = session.getMapper(UserMapper.class);
try {
List<User> userList = userMapper.findUserByLikeName("张");
System.out.println(userList.size());
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
session.close();
}
//插入数据
@Test
public void testInsertUser() {
//通过工厂对象生成sqlsession对象
SqlSession session = sqlSessionFactory.openSession();
UserMapper userMapper = session.getMapper(UserMapper.class);
//创建用户对象
User user = new User();
user.setAddress("广西");
user.setBirthday(new Date());
user.setSex("1");
user.setUsername("legend");
//session.insert("test.insertUser", user);
try {
//动态代理实现插入数据
userMapper.addUser(user);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//实现事务提交
session.commit();
System.out.println("插入成功");
//session.close();
}
//修改信息
@Test
public void testUpdateUser() {
//通过工厂对象生成sqlsession对象
SqlSession session = sqlSessionFactory.openSession();
//User user = new User();
UserMapper userMapper = session.getMapper(UserMapper.class);
try {
//先查找数据库里面的数据 获得修改的对象
User user = userMapper.findUserById(10);
user.setId(26);
user.setAddress("广东广州");
user.setBirthday(new Date());
user.setSex("2");
user.setUsername("五仁");
//session.update("updateUser", user);
userMapper.updateUser(user);
session.commit();
System.out.println("更新成功");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//session.close();
}
//删除
@Test
public void testDelUser() {
//通过工厂对象生成sqlsession对象
SqlSession session = sqlSessionFactory.openSession();
session.delete("test.delUser", 28);
session.commit();
System.out.println("删除成功");
}
}
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