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Get one-to-one relationship objects with JOIN query with myBatis


Get one-to-one relationship objects with JOIN query with myBatis

By : Donbelar Goh
Date : November 17 2020, 03:01 PM
hope this fix your issue Note that using @Many involve that Worker class has Collection property. In you case, you must use @One.
Just quoting API documentation:
code :
<resultMap id ="workerResultMap" type="Worker">
  <association property="bank" resultMap="bankResultMap"/>
</resultMap>
<resultMap id ="bankResultMap" type="Bank">
</resultMap>


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SQL - How can I query for all objects who have COUNT(0) of related objects in a reverse relationship?

SQL - How can I query for all objects who have COUNT(0) of related objects in a reverse relationship?


By : Brian
Date : March 29 2020, 07:55 AM
MyBatis query not returning values when using a join

MyBatis query not returning values when using a join


By : Alexander Kovtun
Date : March 29 2020, 07:55 AM
will help you After much debugging, the problem appears to be related to transactions and our testing framework. We're using Unitils to handle refreshing test data, and we found that after setting this property:
code :
DatabaseModule.Transactional.value.default=disabled
myBatis 3 query from tables without relationship

myBatis 3 query from tables without relationship


By : Timothy Dillinger
Date : March 29 2020, 07:55 AM
wish help you to fix your issue What @BerndBuffen said is true, the error states that you are probably getting a column that exists in both tables (at least TRANXLOGID) so Oracle doesn't know which one to use. So your MyBatis Base_Column_List should look like this:
code :
<!-- since I don't know which column is from wich table I consider -->
<!-- it to be all from STD -->
<sql id="Base_Column_List">
    STD.DETAIL_ID, STD.TRANXLOGID, STD.STATEMENT_ID, STD.STATEMENT_GEN,
    STD.STATEMENT_RECON
</sql>
One-To-Many relationship gets duplicate objects using left join

One-To-Many relationship gets duplicate objects using left join


By : user1727620
Date : March 29 2020, 07:55 AM
Hope this helps Maybe I fell into a very common misunderstanding of JPA.
According to what I understood from Hibernate FAQs and this question, that has some similarities to mine, this is the expected behavior of JPA and it is necessary to use other resources to eliminate duplicates from result.
code :
select m from ContextEntity e left join e.metadata m where e.id=:contextId
select metadata1_.id as id1_5_, metadata1_.value as value3_5_ from context_entity contextent0_ left outer join type_spec_characteristic_value metadata1_ on contextent0_.id=metadata1_.entity_id where contextent0_.id=[some_context_id]
I am new to mybatis. I want to know how one to many relationship is mapped in mybatis

I am new to mybatis. I want to know how one to many relationship is mapped in mybatis


By : user3106254
Date : March 29 2020, 07:55 AM
may help you . the following should solve your problem(s):
please also set property javaType="List" in collection-tag
code :
<collection
    property="skills"
    javaType="List"
    ofType="skill"
    resultMap="skillResult"
    columnPrefix="skill_"/>
<select id="getAllEmployees" resultType="employee" resultMap="result">
    Select
        e.empid,
        e.firstname,
        e.lastname,
        e.age,
        e.salary,
        e.department,
        e.state,
        e.city,
        e.address,
        e.gender,
        e.email,
        s.skillid   as skill_id,
        s.skillname as skill_name,
        s.empId     as skill_empid
    from
        Employee40 e
    right outer join
        Skill s
    on e.empid = s.empid
</select>
<resultMap type="skill" id="skillResult">
    <id
        property="skillId"
        column="id"/>
    <result
        property="skillname"
        column="name"/>
    <result
        property="empId"
        column="empId"/>
</resultMap>
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