Databases
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    copied!<p>You need to tell Code First how these classes relate to tables. There are three options:</p> <ul> <li><p><strong>Table per type (TPT)</strong> would mean the fields defined on Fund and InvestorFund would go into their own tables and properties defined on BaseEntity would go to a table named BaseEntity. Querying would be slower as each entity now has to combine the fields from multiple tables. </p> <pre><code>modelBuilder.Entity&lt;Fund&gt;().ToTable("Funds"); modelBuilder.Entity&lt;InvestorFund&gt;().ToTable("InvestorFunds"); </code></pre></li> <li><p><strong>Table per heirarchy (TPH)</strong> would mean that Fund, InvestorFund and BaseEntity properties would all be merged into a single table named BaseEntity and an extra field would be required to indicate which row is which type. This extra field is called the <em>discriminator</em>.</p> <pre><code>modelBuilder.Entity&lt;BaseEntity&gt;() .Map&lt;Fund&gt;(m =&gt; m.Requires("Discriminator").HasValue("F")) .Map&lt;InvestorFund&gt;(m =&gt; m.Requires("Discriminator").HasValue("I")); </code></pre></li> <li><p><strong>Table per concrete type (TPC)</strong> would mean that Fund and InvestorFund each have their own table which would also include any fields needed for their base classes.</p> <pre><code>modelBuilder.Entity&lt;Fund&gt;().Map(m =&gt; { m.MapInheritedProperties(); m.ToTable("Funds"); }); modelBuilder.Entity&lt;InvestorFund&gt;().Map(m =&gt; { m.MapInheritedProperties(); m.ToTable("InvestorFunds"); }); </code></pre></li> </ul>
 

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