api/1.1.3/javax/persistence/DiscriminatorColumn.html - gerrit/www.eclipse.org/eclipselink - Git at Google

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 <H2>
 <FONT SIZE="-1">
 javax.persistence</FONT>
 <BR>
 Annotation Type DiscriminatorColumn</H2>
 <HR>
 <DL>
 <DT><PRE><FONT SIZE="-1">@Target(value=TYPE)
 @Retention(value=RUNTIME)
 </FONT>public @interface <B>DiscriminatorColumn</B></DL>
 </PRE>

 <P>
 Is used to define the discriminator column for the
  <A HREF="../../javax/persistence/InheritanceType.html#SINGLE_TABLE"><CODE>SINGLE_TABLE</CODE></A> and
  <A HREF="../../javax/persistence/InheritanceType.html#JOINED"><CODE>JOINED</CODE></A> inheritance mapping strategies.

  <p> The strategy and the discriminator column are only
  specified in the root of an entity class hierarchy or
  subhierarchy in which a different inheritance strategy is applied

  <p> If the <code>DiscriminatorColumn</code> annotation is missing,
  and a discriminator column is required, the name of the
  discriminator column defaults to <code>"DTYPE"</code> and the discriminator
  type to <A HREF="../../javax/persistence/DiscriminatorType.html#STRING"><CODE>DiscriminatorType.STRING</CODE></A>.

  <pre>
      Example:
      &#064;Entity
      &#064;Table(name="CUST")
      &#064;Inheritance(strategy=SINGLE_TABLE)
      &#064;DiscriminatorColumn(name="DISC", discriminatorType=STRING,length=20)
      public class Customer { ... }

      &#064;Entity
      public class ValuedCustomer extends Customer { ... }
  </pre>
 <P>

 <P>
 <DL>
 <DT><B>Since:</B></DT>
   <DD>Java Persistence 1.0</DD>
 </DL>
 <HR>

 <P>
 <!-- =========== ANNOTATION TYPE OPTIONAL MEMBER SUMMARY =========== -->

 <A NAME="annotation_type_optional_element_summary"><!-- --></A>
 <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
 <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
 <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
 <B>Optional Element Summary</B></FONT></TH>
 </TR>
 <TR BGCOLOR="white" CLASS="TableRowColor">
 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
 <CODE>&nbsp;java.lang.String</CODE></FONT></TD>
 <TD><CODE><B><A HREF="../../javax/persistence/DiscriminatorColumn.html#columnDefinition()">columnDefinition</A></B></CODE>

 <BR>
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(Optional) The SQL fragment that is used when generating the DDL
  for the discriminator column.</TD>
 </TR>
 <TR BGCOLOR="white" CLASS="TableRowColor">
 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
 <CODE>&nbsp;<A HREF="../../javax/persistence/DiscriminatorType.html" title="enum in javax.persistence">DiscriminatorType</A></CODE></FONT></TD>
 <TD><CODE><B><A HREF="../../javax/persistence/DiscriminatorColumn.html#discriminatorType()">discriminatorType</A></B></CODE>

 <BR>
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(Optional) The type of object/column to use as a class discriminator.</TD>
 </TR>
 <TR BGCOLOR="white" CLASS="TableRowColor">
 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
 <CODE>&nbsp;int</CODE></FONT></TD>
 <TD><CODE><B><A HREF="../../javax/persistence/DiscriminatorColumn.html#length()">length</A></B></CODE>

 <BR>
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(Optional) The column length for String-based discriminator types.</TD>
 </TR>
 <TR BGCOLOR="white" CLASS="TableRowColor">
 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
 <CODE>&nbsp;java.lang.String</CODE></FONT></TD>
 <TD><CODE><B><A HREF="../../javax/persistence/DiscriminatorColumn.html#name()">name</A></B></CODE>

 <BR>
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(Optional) The name of column to be used for the discriminator.</TD>
 </TR>
 </TABLE>
 &nbsp;
 <P>
 <A NAME="name()"><!-- --></A><H3>
 name</H3>
 <PRE>
 public abstract java.lang.String <B>name</B></PRE>
 <DL>
 <DD>(Optional) The name of column to be used for the discriminator.
 <P>
 <DD><DL>
 </DL>
 </DD>
 <DD><DL>
 </DL>
 <DL>
 <DT><B>Default:</B><DD>"DTYPE"</DD>
 </DL>
 </DL>
 <HR>

 <A NAME="discriminatorType()"><!-- --></A><H3>
 discriminatorType</H3>
 <PRE>
 public abstract <A HREF="../../javax/persistence/DiscriminatorType.html" title="enum in javax.persistence">DiscriminatorType</A> <B>discriminatorType</B></PRE>
 <DL>
 <DD>(Optional) The type of object/column to use as a class discriminator.
  Defaults to <A HREF="../../javax/persistence/DiscriminatorType.html#STRING"><CODE>DiscriminatorType.STRING</CODE></A>.
 <P>
 <DD><DL>
 </DL>
 </DD>
 <DD><DL>
 </DL>
 <DL>
 <DT><B>Default:</B><DD>javax.persistence.DiscriminatorType.STRING</DD>
 </DL>
 </DL>
 <HR>

 <A NAME="columnDefinition()"><!-- --></A><H3>
 columnDefinition</H3>
 <PRE>
 public abstract java.lang.String <B>columnDefinition</B></PRE>
 <DL>
 <DD>(Optional) The SQL fragment that is used when generating the DDL
  for the discriminator column.
  <p> Defaults to the provider-generated SQL to create a column
  of the specified discriminator type.
 <P>
 <DD><DL>
 </DL>
 </DD>
 <DD><DL>
 </DL>
 <DL>
 <DT><B>Default:</B><DD>""</DD>
 </DL>
 </DL>
 <HR>

 <A NAME="length()"><!-- --></A><H3>
 length</H3>
 <PRE>
 public abstract int <B>length</B></PRE>
 <DL>
 <DD>(Optional) The column length for String-based discriminator types.
  Ignored for other discriminator types.
 <P>
 <DD><DL>
 </DL>
 </DD>
 <DD><DL>
 </DL>
 <DL>
 <DT><B>Default:</B><DD>31</DD>
 </DL>
 </DL>
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	<!-- ======== START OF CLASS DATA ======== -->
	<H2>
	<FONT SIZE="-1">
	javax.persistence</FONT>
	<BR>
	Annotation Type DiscriminatorColumn</H2>
	<HR>
	<DL>
	<DT><PRE><FONT SIZE="-1">@Target(value=TYPE)
	@Retention(value=RUNTIME)
	</FONT>public @interface <B>DiscriminatorColumn</B></DL>
	</PRE>

	<P>
	Is used to define the discriminator column for the
	<A HREF="../../javax/persistence/InheritanceType.html#SINGLE_TABLE"><CODE>SINGLE_TABLE</CODE></A> and
	<A HREF="../../javax/persistence/InheritanceType.html#JOINED"><CODE>JOINED</CODE></A> inheritance mapping strategies.

	<p> The strategy and the discriminator column are only
	specified in the root of an entity class hierarchy or
	subhierarchy in which a different inheritance strategy is applied

	<p> If the <code>DiscriminatorColumn</code> annotation is missing,
	and a discriminator column is required, the name of the
	discriminator column defaults to <code>"DTYPE"</code> and the discriminator
	type to <A HREF="../../javax/persistence/DiscriminatorType.html#STRING"><CODE>DiscriminatorType.STRING</CODE></A>.

	<pre>
	Example:
	@Entity
	@Table(name="CUST")
	@Inheritance(strategy=SINGLE_TABLE)
	@DiscriminatorColumn(name="DISC", discriminatorType=STRING,length=20)
	public class Customer { ... }

	@Entity
	public class ValuedCustomer extends Customer { ... }
	</pre>
	<P>

	<P>
	<DL>
	<DT><B>Since:</B></DT>
	<DD>Java Persistence 1.0</DD>
	</DL>
	<HR>

	<P>
	<!-- =========== ANNOTATION TYPE OPTIONAL MEMBER SUMMARY =========== -->

	<A NAME="annotation_type_optional_element_summary"><!-- --></A>
	<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
	<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
	<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
	<B>Optional Element Summary</B></FONT></TH>
	</TR>
	<TR BGCOLOR="white" CLASS="TableRowColor">
	<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
	<CODE> java.lang.String</CODE></FONT></TD>
	<TD><CODE><B><A HREF="../../javax/persistence/DiscriminatorColumn.html#columnDefinition()">columnDefinition</A></B></CODE>

	<BR>
	(Optional) The SQL fragment that is used when generating the DDL
	for the discriminator column.</TD>
	</TR>
	<TR BGCOLOR="white" CLASS="TableRowColor">
	<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
	<CODE> <A HREF="../../javax/persistence/DiscriminatorType.html" title="enum in javax.persistence">DiscriminatorType</A></CODE></FONT></TD>
	<TD><CODE><B><A HREF="../../javax/persistence/DiscriminatorColumn.html#discriminatorType()">discriminatorType</A></B></CODE>

	<BR>
	(Optional) The type of object/column to use as a class discriminator.</TD>
	</TR>
	<TR BGCOLOR="white" CLASS="TableRowColor">
	<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
	<CODE> int</CODE></FONT></TD>
	<TD><CODE><B><A HREF="../../javax/persistence/DiscriminatorColumn.html#length()">length</A></B></CODE>

	<BR>
	(Optional) The column length for String-based discriminator types.</TD>
	</TR>
	<TR BGCOLOR="white" CLASS="TableRowColor">
	<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
	<CODE> java.lang.String</CODE></FONT></TD>
	<TD><CODE><B><A HREF="../../javax/persistence/DiscriminatorColumn.html#name()">name</A></B></CODE>

	<BR>
	(Optional) The name of column to be used for the discriminator.</TD>
	</TR>
	</TABLE>

	<P>
	<A NAME="name()"><!-- --></A><H3>
	name</H3>
	<PRE>
	public abstract java.lang.String <B>name</B></PRE>
	<DL>
	<DD>(Optional) The name of column to be used for the discriminator.
	<P>
	<DD><DL>
	</DL>
	</DD>
	<DD><DL>
	</DL>
	<DL>
	<DT><B>Default:</B><DD>"DTYPE"</DD>
	</DL>
	</DL>
	<HR>

	<A NAME="discriminatorType()"><!-- --></A><H3>
	discriminatorType</H3>
	<PRE>
	public abstract <A HREF="../../javax/persistence/DiscriminatorType.html" title="enum in javax.persistence">DiscriminatorType</A> <B>discriminatorType</B></PRE>
	<DL>
	<DD>(Optional) The type of object/column to use as a class discriminator.
	Defaults to <A HREF="../../javax/persistence/DiscriminatorType.html#STRING"><CODE>DiscriminatorType.STRING</CODE></A>.
	<P>
	<DD><DL>
	</DL>
	</DD>
	<DD><DL>
	</DL>
	<DL>
	<DT><B>Default:</B><DD>javax.persistence.DiscriminatorType.STRING</DD>
	</DL>
	</DL>
	<HR>

	<A NAME="columnDefinition()"><!-- --></A><H3>
	columnDefinition</H3>
	<PRE>
	public abstract java.lang.String <B>columnDefinition</B></PRE>
	<DL>
	<DD>(Optional) The SQL fragment that is used when generating the DDL
	for the discriminator column.
	<p> Defaults to the provider-generated SQL to create a column
	of the specified discriminator type.
	<P>
	<DD><DL>
	</DL>
	</DD>
	<DD><DL>
	</DL>
	<DL>
	<DT><B>Default:</B><DD>""</DD>
	</DL>
	</DL>
	<HR>

	<A NAME="length()"><!-- --></A><H3>
	length</H3>
	<PRE>
	public abstract int <B>length</B></PRE>
	<DL>
	<DD>(Optional) The column length for String-based discriminator types.
	Ignored for other discriminator types.
	<P>
	<DD><DL>
	</DL>
	</DD>
	<DD><DL>
	</DL>
	<DL>
	<DT><B>Default:</B><DD>31</DD>
	</DL>
	</DL>
	<!-- ========= END OF CLASS DATA ========= -->
	<HR>


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