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POnHiberbate: Table per hierarchy - SchemaExport problem
 

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  1. POnHiberbate: Table per hierarchy - SchemaExport problem
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    <p>I am using nhibernate to map the following classes:</p> <pre><code>public class DeviceConfig : EntityBase { public virtual string Name { get { return m_Name; } set { SetValue(ref m_Name, value); } } public virtual string Description { get { return m_Description; } set { SetValue(ref m_Description, EmptyStringIfValueNull(value)); } } } public class DeviceConfigEmail : DeviceConfig { public virtual string SmtpServer { get { return m_SmtpServer; } set { SetValue(ref m_SmtpServer, EmptyStringIfValueNull(value)); } } } public class DeviceConfigSMS : DeviceConfig { public virtual string SmsServer { get { return m_SmsServer; } set { SetValue(ref m_SmsServer, EmptyStringIfValueNull(value)); } } } </code></pre> <p>With the following Mapping file:</p> <pre><code>&lt;hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" default-access="field.pascalcase-m-underscore"&gt; &lt;class name="MyNamespace.DeviceConfig, MyNamespace" table="DeviceConfig" lazy="false"&gt; &lt;id name="ID" access="property" column="DeviceConfigID" unsaved-value="-1"&gt; &lt;generator class="identity" /&gt; &lt;/id&gt; &lt;discriminator column="Discriminator"/&gt; &lt;version name="Version" column="Version"/&gt; &lt;property name="Name" not-null="true"/&gt; &lt;property name="Description" not-null="true"/&gt; &lt;subclass name="MyNamespace.DeviceConfigEmail, MyNamespace" discriminator-value="Email" lazy="false"&gt; &lt;property name="SmtpServer" not-null="true" /&gt; &lt;/subclass&gt; &lt;subclass name="MyNamespace.DeviceConfigSMS, MyNamespace" discriminator-value="SMS" lazy="false"&gt; &lt;property name="SmsServer" not-null="true" /&gt; &lt;/subclass&gt; &lt;/class&gt; &lt;/hibernate-mapping&gt; </code></pre> <p>I am doing table per hierarchy data modelling to a table as follows:</p> <pre><code>table: DeviceConfig - DeviceConfigID (PK, int, not null) - Discriminator (varchar(20), not null) - Name (varchar(50), not null) - Description (varchar(200), not null) - SmtpServer (varchar(30), null) - SmsServer (varchar(30), null) </code></pre> <p>This is all well and good, and works against my SQL database.</p> <p>I now want to do a SchemaExport to do some in memory testing against Sqlite. When I generate this table with a schema export, both SmtpServer and SmsServer columns get generated as <strong>not null</strong>. </p> <p>Is there something I am doing wrong? How can I get these columns to generate as nullable?</p> <p>Thanks,</p> <p>Paul</p>
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