Mybatis持久层注解开发

小黑哎代码
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1. 配置增删改查

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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();
}


2. 常用查询

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一对一 : @One
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);
}


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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);
}



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一对多： @Many
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);
}


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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);
}


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多对多： @Many 和@One
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);
}


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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);
}


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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);
来源：CSDN

原文：https://blog.csdn.net/m0_37779570/article/details/81514757 

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