mybatis-注解及其他

一：配置sqlMapConfig.xml（其他配置详见mybatis-xml配置随笔）

<?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 resource="datasource.properties"></properties>
<settings><setting name="cacheEnabled" value="true"/>
</settings><!-- 将我们的pojo注册到配置文件 --><typeAliases><package name="com.wode.pojo" /></typeAliases><environments default="development"><environment id="development"><transactionManager type="JDBC" /><dataSource type="POOLED"><property name="driver" value="${jdbc.driver}" /><property name="url" value="${jdbc.url}" /><property name="username" value="${jdbc.username}" /><property name="password" value="${jdbc.password}" /></dataSource></environment></environments><mappers><package name="com/wode/mapper" /></mappers>
</configuration>

二：普通增删改查

package com.wode.mapper;
import java.util.List;
import java.util.Map;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Options;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.ResultMap;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import com.wode.pojo.User;public interface UserMapper {//使用注解的方式新增用户@Insert("insert into users values(null,#{user.userName},#{user.userPwd},#{user.userType})")@Options(keyProperty="user.userId",useGeneratedKeys=true)public int addUser(@Param("user")User user);//注解的方式修改用户资料---多参数传递第二种方式@Update("update users set user_name=#{name} where user_id=#{id}")public int updateUserNameById(@Param("name")String name,@Param("id")int id);//注解的方式删除用户@Delete("delete from users where user_id=#{id}")public int delById(@Param("id") int id);@Select("select * from users")
/**    @Results({@Result(id=true,property="userId",column="user_id",javaType=Integer.class),@Result(property="userName",column="user_name",javaType=String.class),@Result(property="userPwd",column="user_pwd",javaType=String.class),@Result(property="userType",column="user_type",javaType=Integer.class)})*/@ResultMap("userMap")public List<User> findAllUser();
}

二：常用查询

2.1：一对一

package com.wode.mapper;import java.util.List;
import java.util.Map;import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.One;
import org.apache.ibatis.annotations.Options;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.ResultMap;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;import com.wode.pojo.User;public interface UserMapper {//使用注解的方式新增用户@Insert("insert into users values(null,#{user.userName},#{user.userPwd},#{user.userType})")@Options(keyProperty="user.userId",useGeneratedKeys=true)public int addUser(@Param("user")User user);//注解的方式修改用户资料---多参数传递第二种方式@Update("update users set user_name=#{name} where user_id=#{id}")public int updateUserNameById(@Param("name")String name,@Param("id")int id);//注解的方式删除用户@Delete("delete from users where user_id=#{id}")public int delById(@Param("id") int id);@Select("select * from users")
/**    @Results({@Result(id=true,property="userId",column="user_id",javaType=Integer.class),@Result(property="userName",column="user_name",javaType=String.class),@Result(property="userPwd",column="user_pwd",javaType=String.class),@Result(property="userType",column="user_type",javaType=Integer.class)})*/@ResultMap("userMap")public List<User> findAllUser();@Select("select * from users where user_id=#{id}")@ResultMap("userMap")public User findUserById(@Param("id") int id);//1:1@Select("select * from users where user_id=#{id}")@ResultMap("userMap")public User findUserAndInfo(@Param("id")int id);
}

package com.wode.mapper;import java.util.List;import org.apache.ibatis.annotations.One;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.Select;import com.wode.pojo.UserInfo;public interface UserInfoMapper {@Select("select * from userInfo")@Results({@Result(id=true,column="info_id",property="infoId",javaType=Integer.class),@Result(column="nickName",javaType=String.class,property="nickName"),@Result(column="email",property="email",javaType=String.class)})public List<UserInfo> findUserInfo();//user中外键查询数据@Select("select * from userInfo where user_id=#{id}")@Results({@Result(id=true,column="info_id",property="infoId",javaType=Integer.class),@Result(column="nickName",javaType=String.class,property="nickName"),@Result(column="email",property="email",javaType=String.class)})public UserInfo findByUser(@Param("id")int id);//1:1@Select("select * from userinfo where info_id=#{info_id}")@Results({@Result(id=true,column="info_id",property="infoId",javaType=Integer.class),@Result(column="nickName",javaType=String.class,property="nickName"),@Result(column="email",property="email",javaType=String.class),@Result(column="user_id",property="user",one=@One(select="com.wode.mapper.UserMapper.findUserById"))})public UserInfo findInfoAndUser(@Param("info_id") int id);}

2.2：一对多

public interface UserMapper {//使用注解的方式新增用户@Insert("insert into users values(null,#{user.userName},#{user.userPwd},#{user.userType})")@Options(keyProperty="user.userId",useGeneratedKeys=true)public int addUser(@Param("user")User user);//注解的方式修改用户资料---多参数传递第二种方式@Update("update users set user_name=#{name} where user_id=#{id}")public int updateUserNameById(@Param("name")String name,@Param("id")int id);//注解的方式删除用户@Delete("delete from users where user_id=#{id}")public int delById(@Param("id") int id);@Select("select * from users")
/**    @Results({@Result(id=true,property="userId",column="user_id",javaType=Integer.class),@Result(property="userName",column="user_name",javaType=String.class),@Result(property="userPwd",column="user_pwd",javaType=String.class),@Result(property="userType",column="user_type",javaType=Integer.class)})*/@ResultMap("userMap")public List<User> findAllUser();@Select("select * from users where user_id=#{id}")@ResultMap("userMap")public User findUserById(@Param("id") int id);//一对多查询@Select("select * from users where user_id=#{id}")@Results({@Result(id=true,property="userId",column="user_id",javaType=Integer.class),@Result(property="userName",column="user_name",javaType=String.class),@Result(property="userPwd",column="user_pwd",javaType=String.class),@Result(property="userType",column="user_type",javaType=Integer.class),@Result(property="info",column="user_id",many=@Many(select="com.wode.mapper.UserInfoMapper.findByUser"))})public User findUserAndInfo(@Param("id")int id);
}

public interface UserInfoMapper {@Select("select * from userInfo")@Results({@Result(id=true,column="info_id",property="infoId",javaType=Integer.class),@Result(column="nickName",javaType=String.class,property="nickName"),@Result(column="email",property="email",javaType=String.class)})public List<UserInfo> findUserInfo();//user中外键查询数据@Select("select * from userInfo where user_id=#{id}")@Results({@Result(id=true,column="info_id",property="infoId",javaType=Integer.class),@Result(column="nickName",javaType=String.class,property="nickName"),@Result(column="email",property="email",javaType=String.class)})public UserInfo findByUser(@Param("id")int id);@Select("select * from userInfo where info_id=#{infoId}")@Results({@Result(id=true,column="info_id",property="infoId",javaType=Integer.class),@Result(column="nickName",javaType=String.class,property="nickName"),@Result(column="email",property="email",javaType=String.class),@Result(column="user_id",property="user",one=@One(select="com.wode.mapper.UserMapper.findUserById"))})public UserInfo findInfoAndUser(@Param("infoId")int infoId);
}

2.3：多对多

public interface UserMapper {//使用注解的方式新增用户@Insert("insert into users values(null,#{user.userName},#{user.userPwd},#{user.userType})")@Options(keyProperty="user.userId",useGeneratedKeys=true)public int addUser(@Param("user")User user);//注解的方式修改用户资料---多参数传递第二种方式@Update("update users set user_name=#{name} where user_id=#{id}")public int updateUserNameById(@Param("name")String name,@Param("id")int id);//注解的方式删除用户@Delete("delete from users where user_id=#{id}")public int delById(@Param("id") int id);@Select("select * from users")
/**    @Results({@Result(id=true,property="userId",column="user_id",javaType=Integer.class),@Result(property="userName",column="user_name",javaType=String.class),@Result(property="userPwd",column="user_pwd",javaType=String.class),@Result(property="userType",column="user_type",javaType=Integer.class)})*/@ResultMap("userMap")public List<User> findAllUser();@Select("select * from users where user_id=#{id}")@ResultMap("userMap")public User findUserById(@Param("id") int id);//多对多查询@Select("select * from users where user_id=#{id}")@Results({@Result(id=true,property="userId",column="user_id",javaType=Integer.class),@Result(property="userName",column="user_name",javaType=String.class),@Result(property="userPwd",column="user_pwd",javaType=String.class),@Result(property="userType",column="user_type",javaType=Integer.class),@Result(property="course",column="user_id",many=@Many(select="com.wode.mapper.CourseMapper.findCourseByUser"))})public User findUserAndCourse(@Param("id")int id);@Select("select * from users where user_id in (select user_id from user_course where course_id=#{courseId})")@Results({@Result(id=true,property="userId",column="user_id",javaType=Integer.class),@Result(property="userName",column="user_name",javaType=String.class),@Result(property="userPwd",column="user_pwd",javaType=String.class),@Result(property="userType",column="user_type",javaType=Integer.class)})public User findUserByCourse(@Param("id")int courseId);
}

public interface UserInfoMapper {@Select("select * from userInfo")@Results({@Result(id=true,column="info_id",property="infoId",javaType=Integer.class),@Result(column="nickName",javaType=String.class,property="nickName"),@Result(column="email",property="email",javaType=String.class)})public List<UserInfo> findUserInfo();//user中外键查询数据@Select("select * from userInfo where user_id=#{id}")@Results({@Result(id=true,column="info_id",property="infoId",javaType=Integer.class),@Result(column="nickName",javaType=String.class,property="nickName"),@Result(column="email",property="email",javaType=String.class)})public UserInfo findByUser(@Param("id")int id);@Select("select * from userInfo where info_id=#{infoId}")@Results({@Result(id=true,column="info_id",property="infoId",javaType=Integer.class),@Result(column="nickName",javaType=String.class,property="nickName"),@Result(column="email",property="email",javaType=String.class),@Result(column="user_id",property="user",one=@One(select="com.wode.mapper.UserMapper.findUserById"))})public UserInfo findInfoAndUser(@Param("infoId")int infoId);
}

public interface CourseMapper {@Select("select * from course where course_id=#{id}")@Results({@Result(id=true,column="course_id",property="courseId",javaType=Integer.class),@Result(column="code",property="code",javaType=String.class),@Result(column="name",property="name",javaType=String.class)})public Course findCourseById(@Param("id")int id);@Select("select * from course where course_id in (select course_id from user_course where user_id=#{id})")@Results({@Result(id=true,column="course_id",property="courseId",javaType=Integer.class),@Result(column="code",property="code",javaType=String.class),@Result(column="name",property="name",javaType=String.class)})public Course findCourseByUser(@Param("uId")int id);@Select("select * from course where course_id=#{courseId}")@Results({@Result(id=true,column="course_id",property="courseId",javaType=Integer.class),@Result(column="code",property="code",javaType=String.class),@Result(column="name",property="name",javaType=String.class),@Result(property="users",column="course_id",many=@Many(select="com.wode.mapper.UserMapper.findUserByCourse"))})public Course findCourseAndUser(@Param("courseId")int courseId);
}

在mapper包中的接口和xml文件链接，需：

SqlSession session = DbUtil.getSession();UserInfoMapper mapper = session.getMapper(UserInfoMapper.class);

通过mapper.findUserInfoById(id)等方式实现增删改查

转载于:https://www.cnblogs.com/xieshunjin/p/5797137.html

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