Nikita Boyko :
I am trying to use myBatis in my project. For the "Select" method, I used result map
<?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="resultMap">
<resultMap id="userMap" type="db.entities.User">
<result column="id" property="id"/>
<result column="login" property="login"/>
<result column="password" property="password"/>
<result column="service_profile" property="serviceProfile.id"/>
<result column="driver_profile" property="driverProfile.id"/>
<result column="premium_expiring_time" property="premiumExpiringDate"/>
<result column="registration_date" property="registrationDate"/>
<result column="last_visit_date" property="lastVisitDate"/>
<result column="authorization_key" property="authorizationKey"/>
<result column="last_altitude" property="lastGeoAltitude"/>
<result column="last_longitude" property="lastGeoLongitude"/>
</resultMap>
</mapper>
And it works, when I get from my function's argument instance of my class
@ResultMap("resultMap.userMap")
@Select("SELECT * FROM users WHERE login = #{login} AND password = #{password}")
fun getUser(user: User): User?
But I think, that it is bad idea, because first I need to create User(). When I try to use "login" and "password" in function's arguments, I take an exception:
org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: org.apache.ibatis.binding.BindingException: Parameter 'login' not found. Available parameters are [arg1, arg0, param1, param2]
### Cause: org.apache.ibatis.binding.BindingException: Parameter 'login' not found. Available parameters are [arg1, arg0, param1, param2]
How can I use incoming arguments without creating instance of my class User?
ave :
You need to 1) add @Param to each parameter or 2) add Kotlin compiler option -java-parameters.
1) would look as follows:
@ResultMap("resultMap.userMap")
@Select("SELECT * FROM users WHERE login = #{login} AND password = #{password}")
fun getUser(
@Param("login") login: String,
@Param("password") password: String): User?
2) requires MyBatis 3.4.1+ and Kotlin 1.1+.
MyBatis' parameter name resolution is somewhat complicated mainly because of historical reasons.
See this answer if you are interested.
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