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POHow to set a foreign key?
 

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  1. POHow to set a foreign key?
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    <p>I am doing a project which is using MDB2 implementation.</p> <p>I wanna to set a foreign key on xml schema file. There are only 3 tables: student, course, and enrollment where enrollment is serve as a bridge entity.</p> <p>Here is my xml file for enrollment.</p> <pre><code>&lt;database&gt; &lt;name&gt;mdb2_schema_demo&lt;/name&gt; &lt;charset&gt;utf8&lt;/charset&gt; &lt;description&gt;A database to demo MDB2 schema sync&lt;/description&gt; &lt;table&gt; &lt;name&gt;enrollment&lt;/name&gt; &lt;declaration&gt; &lt;field&gt; &lt;name&gt;id&lt;/name&gt; &lt;type&gt;integer&lt;/type&gt; &lt;notnull&gt;1&lt;/notnull&gt; &lt;autoincrement&gt;1&lt;/autoincrement&gt; &lt;unsigned&gt;1&lt;/unsigned&gt; &lt;length&gt;8&lt;/length&gt; &lt;description&gt;A unique running number to identify enrollment&lt;/description&gt; &lt;/field&gt; &lt;field&gt; &lt;name&gt;student_id&lt;/name&gt; &lt;type&gt;integer&lt;/type&gt; &lt;notnull&gt;0&lt;/notnull&gt; &lt;unsigned&gt;1&lt;/unsigned&gt; &lt;length&gt;8&lt;/length&gt; &lt;description&gt;Foreign key refer to student&lt;/description&gt; &lt;/field&gt; &lt;field&gt; &lt;name&gt;course_id&lt;/name&gt; &lt;type&gt;integer&lt;/type&gt; &lt;notnull&gt;0&lt;/notnull&gt; &lt;unsigned&gt;1&lt;/unsigned&gt; &lt;length&gt;8&lt;/length&gt; &lt;description&gt;Foreign key refer to course&lt;/description&gt; &lt;/field&gt; &lt;index&gt; &lt;name&gt;pk_enrollment&lt;/name&gt; &lt;unique&gt;1&lt;/unique&gt; &lt;primary&gt;1&lt;/primary&gt; &lt;field&gt; &lt;name&gt;id&lt;/name&gt; &lt;sorting&gt;ascending&lt;/sorting&gt; &lt;/field&gt; &lt;/index&gt; &lt;foreign&gt; &lt;name&gt;fk_student_enrollment&lt;/name&gt; &lt;field&gt;student_id&lt;/field&gt; &lt;references&gt; &lt;table&gt;student&lt;/table&gt; &lt;field&gt;id&lt;/field&gt; &lt;/references&gt; &lt;ondelete&gt;restrict&lt;/ondelete&gt; &lt;onupdate&gt;cascade&lt;/onupdate&gt; &lt;/foreign&gt; &lt;foreign&gt; &lt;name&gt;fk_course_enrollment&lt;/name&gt; &lt;field&gt;course_id&lt;/field&gt; &lt;references&gt; &lt;table&gt;course&lt;/table&gt; &lt;field&gt;id&lt;/field&gt; &lt;/references&gt; &lt;ondelete&gt;restrict&lt;/ondelete&gt; &lt;onupdate&gt;cascade&lt;/onupdate&gt; &lt;/foreign&gt; &lt;/declaration&gt; &lt;/table&gt; </code></pre> <p></p> <p>Here is the error.</p> <p>message: MDB2_Schema Error: schema validation error</p> <p>Parser error: referenced table "student" of foreign key fk_student_enrollment" of table "enrollment" does not exist - No error - Byte: 2244; Line: 70; Col: 12</p>
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    1. USJs Lim
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      1. VTUpMod
    1. COWell, the error seems pretty clear to me. Do you have a `student` table?
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      1. USNullUserException
    2. COyes. student (id, name)
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      1. USJs Lim
    3. CO@RebornJs: There's no student table in this XML file.
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      1. USMike Sherrill 'Cat Recall'
 

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