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Posted to dev@ibatis.apache.org by "Bukarev Alexandr (JIRA)" <ib...@incubator.apache.org> on 2009/08/10 15:38:14 UTC

[jira] Created: (IBATIS-622) Nested Results for Association

Nested Results for Association
------------------------------

                 Key: IBATIS-622
                 URL: https://issues.apache.org/jira/browse/IBATIS-622
             Project: iBatis for Java
          Issue Type: Bug
          Components: SQL Maps
    Affects Versions: 3.0.0
         Environment: JDK jdk1.6.0_12
ibatis-3-core-3.0.0.190
JavaDB 10.5.1.1
            Reporter: Bukarev Alexandr
            Priority: Critical


My DDLs:
CREATE
    TABLE APP.plugins
    (
        id INTEGER generated always as identity,
        name VARCHAR(256) NOT NULL,
        PRIMARY KEY (id),
        CONSTRAINT plugin_name UNIQUE (name)
    );

CREATE
    TABLE APP.JSPS
    (
        ID INTEGER generated always as identity,
        NAME VARCHAR(256) NOT NULL,
        PLUGIN_ID INTEGER NOT NULL,
        PRIMARY KEY (ID),
        CONSTRAINT PLUGIN_FK FOREIGN KEY (PLUGIN_ID) REFERENCES PLUGINS (ID),
        CONSTRAINT PLUGIN_JSP_UNIQUE UNIQUE (NAME, PLUGIN_ID)
    );

I try create theese SQLMaps:
<mapper namespace="translateanalizer.db.JSPMapper">
    <resultMap id="JSPMap" type="JSP">
        <id property="id" column="id"/>
        <result property="name" column="name"/>
        <association property="plugin" column="jsp_plugin_id" resultMap="PluginMap"/>
    </resultMap>

    <resultMap id="PluginMap" type="Plugin">
        <id property="id" column="plugin_id"/>
        <result property="name" column="plugin_name"/>
    </resultMap>

    <select id="selectJSPs" resultMap="JSPMap">
        select p.name as plugin_name, p.id as plugin_id, j.name, j.id, j.plugin_id as jsp_plugin_id
        from app.plugins p inner join app.jsps j
        on p.id = j.plugin_id
    </select>
</mapper>

Then selectJSPs generates one Plugin class instanse for every row in ResultSet, thougth JSP relation to Plugin is "Many-To-One"

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[jira] Closed: (IBATIS-622) Nested Results for Association

Posted by "Clinton Begin (JIRA)" <ib...@incubator.apache.org>.
     [ https://issues.apache.org/jira/browse/IBATIS-622?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Clinton Begin closed IBATIS-622.
--------------------------------

    Resolution: Won't Fix

iBATIS reserves the decision whether to create a new instance or reuse the instance.  Thus, iBATIS does not guarantee A1 == A2, but does guarantee that A1.equals(A2), where A defines equals as A1.id.equals(A2.id) or all mapped properties are equal otherwise.  Join mapping will result in multiple instances, because iBATIS does not support object identity.

> Nested Results for Association
> ------------------------------
>
>                 Key: IBATIS-622
>                 URL: https://issues.apache.org/jira/browse/IBATIS-622
>             Project: iBatis for Java
>          Issue Type: Bug
>          Components: SQL Maps
>    Affects Versions: 3.0 Beta 1 
>         Environment: JDK jdk1.6.0_12
> ibatis-3-core-3.0.0.190
> JavaDB 10.5.1.1
>            Reporter: Bukarev Alexandr
>            Priority: Critical
>
> My DDLs:
> CREATE
>     TABLE APP.plugins
>     (
>         id INTEGER generated always as identity,
>         name VARCHAR(256) NOT NULL,
>         PRIMARY KEY (id),
>         CONSTRAINT plugin_name UNIQUE (name)
>     );
> CREATE
>     TABLE APP.JSPS
>     (
>         ID INTEGER generated always as identity,
>         NAME VARCHAR(256) NOT NULL,
>         PLUGIN_ID INTEGER NOT NULL,
>         PRIMARY KEY (ID),
>         CONSTRAINT PLUGIN_FK FOREIGN KEY (PLUGIN_ID) REFERENCES PLUGINS (ID),
>         CONSTRAINT PLUGIN_JSP_UNIQUE UNIQUE (NAME, PLUGIN_ID)
>     );
> I try create theese SQLMaps:
> <mapper namespace="translateanalizer.db.JSPMapper">
>     <resultMap id="JSPMap" type="JSP">
>         <id property="id" column="id"/>
>         <result property="name" column="name"/>
>         <association property="plugin" column="jsp_plugin_id" resultMap="PluginMap"/>
>     </resultMap>
>     <resultMap id="PluginMap" type="Plugin">
>         <id property="id" column="plugin_id"/>
>         <result property="name" column="plugin_name"/>
>     </resultMap>
>     <select id="selectJSPs" resultMap="JSPMap">
>         select p.name as plugin_name, p.id as plugin_id, j.name, j.id, j.plugin_id as jsp_plugin_id
>         from app.plugins p inner join app.jsps j
>         on p.id = j.plugin_id
>     </select>
> </mapper>
> Then selectJSPs generates one Plugin class instanse for every row in ResultSet, thougth JSP relation to Plugin is "Many-To-One"

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