首先在pom.xml中添加依赖
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.4</version>
</dependency>
在resources中新建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>
<properties>
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://127.0.0.1:3306/ssmdemo?useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
</properties>
<environments default="test">
<environment id="test">
<transactionManager type="JDBC" />
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://127.0.0.1:3306/ssmdemo" />
<property name="username" value="root" />
<property name="password" value="root" />
</dataSource>
</environment>
<environment id="development">
<transactionManager type="JDBC" />
<dataSource type="POOLED">
<property name="driver" value="${driver}" />
<property name="url" value="${url}" />
<property name="username" value="${username}" />
<property name="password" value="${password}" />
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="mappers/UserMapper.xml"/>
</mappers>
</configuration>
在resource下新建文件夹mappers，在新建文件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">
<mapper namespace="dao.UserMapper">
1.#{},预编译的方式preparedstatement，使用占位符替换，防止sql注入，一个参数的时候，任意参数名可以接收
2.${},普通的Statement，字符串直接拼接，不可以防止sql注入，一个参数的时候，必须使用${value}接收参数
-->
<select id="queryUserByTableName" resultType="mabatismain.User">
select* from ${tableName}
</select>
<select id="login" resultType="mabatismain.User">
select* from tb_user where user_name = #{userName} and password = #{password}
</select>
id：唯一标识，随便写，在同一个命名空间下保持唯一，使用动态代理之后要求和方法名保持一致
resultType：sql语句查询结果集的封装类型，使用动态代理之后和方法的返回类型一致；resultMap：二选一
parameterType：参数的类型，使用动态代理之后和方法的参数类型一致
-->
<select id="queryUserById" resultType="mabatismain.User">
select* from tb_user where id = #{id}
</select>
<select id="queryUserAll" resultType="mabatismain.User">
select* from tb_user
</select>
id：唯一标识，随便写，在同一个命名空间下保持唯一，使用动态代理之后要求和方法名保持一致
parameterType：参数的类型，使用动态代理之后和方法的参数类型一致
useGeneratedKeys:开启主键回写
keyColumn：指定数据库的主键
keyProperty：主键对应的pojo属性名
-->
<insert id="insertUser" useGeneratedKeys="true" keyColumn="id" keyProperty="id"
parameterType="mabatismain.User">
INSERT INTO tb_user (
id,
user_name,
password,
name,
age,
sex,
birthday,
created,
updated
)
VALUES
(
null,
#{userName},
#{password},
#{name},
#{age},
#{sex},
#{birthday},
NOW(),
NOW()
);
</insert>
更新的statement
id：唯一标识，随便写，在同一个命名空间下保持唯一，使用动态代理之后要求和方法名保持一致
parameterType：参数的类型，使用动态代理之后和方法的参数类型一致
-->
<update id="updateUser" parameterType="mabatismain.User">
UPDATE tb_user
<trim prefix="set" suffixOverrides=",">
<if test="userName!=null">user_name = #{userName},</if>
<if test="password!=null">password = #{password},</if>
<if test="name!=null">name = #{name},</if>
<if test="age!=null">age = #{age},</if>
<if test="sex!=null">sex = #{sex},</if>
<if test="birthday!=null">birthday = #{birthday},</if>
updated = now(),
</trim>
WHERE
(id = #{id});
</update>
删除的statement
id：唯一标识，随便写，在同一个命名空间下保持唯一，使用动态代理之后要求和方法名保持一致
parameterType：参数的类型，使用动态代理之后和方法的参数类型一致
-->
<delete id="deleteUserById" parameterType="java.lang.String">
delete from tb_user where id=#{id}
</delete>
</mapper>
新建 UserMapper.class文件
package dao;
import mabatismain.User;
import org.apache.ibatis.annotations.Param;
import java.util.List;
public interface UserMapper {
/**
* 登录（直接使用注解指定传入参数名称）
* @param userName
* @param password
* @return
*/
public User login(@Param("userName") String userName,@Param("password") String password);
/**
* 根据表名查询用户信息（直接使用注解指定传入参数名称）
* @param tableName
* @return
*/
public List queryUserByTableName(@Param("tableName") String tableName);
/**
* 根据Id查询用户信息
* @param id
* @return
*/
public User queryUserById(String id);
/**
* 查询所有用户信息
* @return
*/
public List queryUserAll();
/**
* 新增用户信息
* @param user
*/
public void insertUser(User user);
/**
* 根据id更新用户信息
* @param user
*/
public void updateUser(User user);
/**
* 根据id删除用户信息
* @param id
*/
public void deleteUserById(String id);
}
创建UserMapper接口测试类
package test;
import dao.UserMapper;
import mabatismain.User;
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 java.io.InputStream;
import java.util.Date;
import java.util.List;
import static org.junit.Assert.*;
public class UserMapperTest {
public UserMapperuserMapper;
@Before
public void setUp()throws Exception {
String res="mybatis-config.xml";
InputStream inputStream= Resources.getResourceAsStream(res);
SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(inputStream);
SqlSession sqlSession=sqlSessionFactory.openSession(true);
userMapper=sqlSession.getMapper(UserMapper.class);
}
@Test
public void testQueryUserByTableName() {
List userList =this.userMapper.queryUserByTableName("tb_user");
for (User user : userList) {
System.out.println(user);
}
}
@Test
public void testLogin() {
System.out.println(this.userMapper.login("hj","123456"));
}
@Test
public void testQueryUserById() {
System.out.println(this.userMapper.queryUserById("1"));
}
@Test
public void testQueryUserAll() {
List userList =this.userMapper.queryUserAll();
for (User user : userList) {
System.out.println(user);
}
}
@Test
public void testInsertUser() {
User user =new User();
user.setAge(20);
user.setBirthday(new Date());
user.setName("大神");
user.setPassword("123456");
user.setSex(2);
user.setUserName("bigGod222");
this.userMapper.insertUser(user);
System.out.println(user.getId());
}
@Test
public void testUpdateUser() {
User user =new User();
user.setBirthday(new Date());
user.setName("静静");
user.setPassword("123456");
user.setSex(0);
user.setUserName("Jinjin");
user.setId("1");
this.userMapper.updateUser(user);
}
@Test
public void testDeleteUserById() {
this.userMapper.deleteUserById("1");
}
}
