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| <div class="refsect1"> |
| <h2 class="refsect1"><font face="arial, helvetica, sans-serif" color="#330099">@Struct</font></h2> |
| <p>Use @Struct to define a class to map to a database <code>Struct</code> type. The class should normally be an Embeddable, but could also be an Entity if stored in a object table.</p> |
| <a id="sthref364" name="sthref364"></a> |
| <p><strong><br /><span class="refsubsect">Annotation Elements</span></strong></p> |
| <p><a href="#CBBCGIHG">Table 2-64</a> describes this annotation's elements.</p> |
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| <p><strong><em><font face="arial, helvetica, sans-serif">Table 2-64 @Struct Annotation Elements</font></em></strong></p> |
| <table class="HRuleFormalWide" title="@Struct Annotation Elements" summary="This table describes this annotation’s elements." dir="ltr" border="1" width="100%" frame="hsides" rules="rows" cellpadding="3" cellspacing="0"> |
| <col width="31%" /> |
| <col width="*" /> |
| <col width="28%" /> |
| <thead> |
| <tr align="left" valign="top"> |
| <th align="left" valign="bottom" id="r1c1-t79"><font face="Arial, Helvetica, sans-serif"><strong>Annotation Element</strong></font></th> |
| <th align="left" valign="bottom" id="r1c2-t79"><font face="Arial, Helvetica, sans-serif"><strong>Description</strong></font></th> |
| <th align="left" valign="bottom" id="r1c3-t79"><font face="Arial, Helvetica, sans-serif"><strong>Default</strong></font></th> |
| </tr> |
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| <td align="left" id="r2c1-t79" headers="r1c1-t79"> |
| <p><code>name</code></p> |
| </td> |
| <td align="left" headers="r2c1-t79 r1c2-t79"> |
| <p>(Required) The database name of the database structure type.</p> |
| </td> |
| <td align="left" headers="r2c1-t79 r1c3-t79"><br /></td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r3c1-t79" headers="r1c1-t79"> |
| <p><code>fields</code></p> |
| </td> |
| <td align="left" headers="r3c1-t79 r1c2-t79"> |
| <p>(Optional) Defines the order of the fields contained in the database structure type.</p> |
| </td> |
| <td align="left" headers="r3c1-t79 r1c3-t79"><br /></td> |
| </tr> |
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| </table> |
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| <!-- class="tblhruleformalwide" --> |
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| <p><strong><br /><span class="refsubsect">Usage</span></strong></p> |
| <p><code>Struct</code> types are extended object-relational data-types supported by some databases. Struct types are user define types in the database such as <code>OBJECT</code> types on Oracle. Structs normally contain Arrays (<code>VARRAY</code>) or other Struct types, and can be stored in a column or a table.</p> |
| <p>You can also use <code>Struct</code> types to call PL/SQL stored procedures that use <code>RECORD</code> types in an Oracle Database.</p> |
| <a id="sthref367" name="sthref367"></a> |
| <p><strong><br /><span class="refsubsect">Examples</span></strong></p> |
| <p><a href="#CACCGJAJ">Example 2-103</a> shows using the <code>@Struct</code> annotation to define a Java class to map to an <code>OBJECT</code> type.</p> |
| <div class="example"><a id="CACCGJAJ" name="CACCGJAJ"></a><a id="TLJPA543" name="TLJPA543"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Example 2-103 Using @Struct Annotation</font></em></strong></p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| @Embeddable |
| <strong>@Struct(name="EMP_TYPE", fields={"F_NAME", "L_NAME", "SALARY"})</strong> |
| public class Employee { |
| @Column(name="F_NAME") |
| private String firstName; |
| @Column(name="L_NAME") |
| private String lastName; |
| @Column(name="SALARY") |
| private BigDecimal salary; |
| ... |
| } |
| </pre></div> |
| <!-- class="example" --> |
| <p><a href="#CBBIEDGD">Example 2-104</a> shows how to use the <code><struct></code> element in the <code>eclipselink-orm.xml</code> file.</p> |
| <div class="example"><a id="CBBIEDGD" name="CBBIEDGD"></a><a id="TLJPA544" name="TLJPA544"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Example 2-104 Using <struct> XML</font></em></strong></p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| <embeddable class="Address" access="FIELD"> |
| <strong><struct name="PLSQL_P_PLSQL_ADDRESS_REC"></strong> |
| <field>ADDRESS_ID</field> |
| <field>STREET_NUM</field> |
| <field>STREET</field> |
| <field>CITY</field> |
| <field>STATE</field> |
| <strong></struct></strong> |
| <attributes> |
| <basic name="id"> |
| <column name="ADDRESS_ID"/> |
| </basic> |
| <basic name="number"> |
| <column name="STREET_NUM"/> |
| </basic> |
| </attributes> |
| </embeddable> |
| </pre></div> |
| <!-- class="example" --> |
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| <p><strong><br /><span class="refsubsect">See Also</span></strong></p> |
| <p>For more information, see:</p> |
| <ul> |
| <li> |
| <p><a href="a_structure.htm#CACIJAFA">"@Structure"</a></p> |
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