package com.rzk.dao;
import com.rzk.pojo.User;
import java.util.List;
import java.util.Map;
public interface UserMapper {
//模糊查詢
List<User> getUserLike(String value);
//查询全部用户
List<User> getUserList();
//根据ID查询用户
User getUserById(int id);
//插入一个用户
int addUser(User user);
//修改用户
int updateUser(User user);
//删除一个用户
int deleteUser(int id);
//插入的Map--------有帮助------------
int addUser1(Map<String,Object> map);
//查询的Map
User getUserId1(Map<String,Object> map);
}
-------
对应的Mapper.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">
<!--namespace 绑定一个对应的Dao/Mapper接口-->
<mapper namespace="com.rzk.dao.UserMapper">
<!--模糊查詢-->
<select id="getUserLike" resultType="com.rzk.pojo.User">
select * from mybatis.user where name like "%"#{value}"%";
</select>
<!--select 查询语句 查询全部用户-->
<select id="getUserList" resultType="com.rzk.pojo.User">
select * from mybatis.user
</select>
<!--根据id查询单个用户-->
<select id="getUserById" parameterType="int" resultType="com.rzk.pojo.User">
select * from mybatis.user where id = #{id}
</select>
<!--插入-->
<insert id="addUser" parameterType="com.rzk.pojo.User" >
insert into mybatis.user (id, name, pwd) values (#{id},#{name},#{pwd})
</insert>
<!--修改-->
<update id="updateUser" parameterType="com.rzk.pojo.User">
update mybatis.user set name=#{name},pwd=#{pwd} where id=#{id};
</update>
<!--删除-->
<delete id="deleteUser" parameterType="int">
delete from mybatis.user where id = #{id}
</delete>
<!--Map
传递map的key就可以了、
-->
<insert id="addUser1" parameterType="map">
insert into mybatis.user(id, name, pwd) values(#{userid},#{username},#{userpassword});
</insert>
<!--Map
传递map的key就可以了、
-->
<select id="getUserId1" parameterType="map" resultType="com.rzk.pojo.User">
select * from mybatis.user where id = #{id} and pwd =#{password};
</select>
</mapper>
-----------------------------
实体类
package com.rzk.pojo;
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 + '\'' +
'}';
}
}
-
------------------------------
package com.rzk.util;
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 resource = "mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
} catch (IOException e) {
e.printStackTrace();
}
}
public static SqlSession getSqlSession(){
return sqlSessionFactory.openSession();
}
}
--------------------------------
测试类
package com.rzk.dao;
import com.rzk.pojo.User;
import com.rzk.util.MybatisUtils;
import com.sun.corba.se.spi.ior.ObjectKey;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.junit.Test;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class UserDaoTest {
@Test
public void getUserLike(){
SqlSession sqlSession = MybatisUtils.getSqlSession();
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
List<User> userList = mapper.getUserLike("李");
for (User user : userList){
System.out.println(user);
}
sqlSession.close();
}
@Test
public void test(){
//获得sqlSession对象
SqlSession sqlSession = MybatisUtils.getSqlSession();
//方式一：getMapper
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
List<User> userList = mapper.getUserList();
for (User user : userList) {
System.out.println(user);
}
sqlSession.close();
}
@Test
public void getUserById(){
SqlSession sqlSession = MybatisUtils.getSqlSession();
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
User userById = mapper.getUserById(1);
System.out.println(userById);
sqlSession.close();
}
@Test
public void addUser(){
SqlSession sqlSession = MybatisUtils.getSqlSession();
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
int i = mapper.addUser(new User(4,"赵柳","1234556"));
sqlSession.commit();
System.out.println("插入成功");
sqlSession.close();
}
@Test
public void updateUser(){
SqlSession sqlSession = MybatisUtils.getSqlSession();
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
int user = mapper.updateUser(new User(1, "李倩", "123123"));
if (user>0){
System.out.println("修改成功");
}
sqlSession.commit();
sqlSession.close();
}
@Test
public void deleteUser(){
SqlSession sqlSession = MybatisUtils.getSqlSession();
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
int i = mapper.deleteUser(5);
if (i>0){
System.out.println("删除成功");
}else{
System.out.println("删除失败");
}
sqlSession.commit();
sqlSession.close();
}
@Test
public void getUserId1(){
SqlSession sqlSession = MybatisUtils.getSqlSession();
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
Map<String, Object> map = new HashMap<String, Object>();
map.put("id",1);
map.put("password","123123");
User user = mapper.getUserId1(map);
System.out.println(user);
sqlSession.close();
}
}
------------------------------------
<?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">
<!--configguration核心配置文件-->
<configuration>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="鏈接?userSSL=true&useUnicode=true&characterEncoding=UTF8"/>
<property name="username" value="root"/>
<property name="password" value="123456"/>
</dataSource>
</environment>
</environments>
<!--每一个Mapper.xml 都需要在Mybatis核心配置文件中注册-->
<mappers>
<mapper resource="com/rzk/dao/UserMapper.xml"/>
</mappers>
</configuration>
