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<!DOCTYPE HTML>
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<title>Ref (Java SE 12 & JDK 12 )</title>
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<h2 title="Interface Ref" class="title">Interface Ref</h2>
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<dt>All Known Implementing Classes:</dt>
<dd><code><a href="../../../java.sql.rowset/javax/sql/rowset/serial/SerialRef.html" title="class in javax.sql.rowset.serial">SerialRef</a></code></dd>
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<pre>public interface <span class="typeNameLabel">Ref</span></pre>
<div class="block">The mapping in the Java programming language of an SQL <code>REF</code>
value, which is a reference to an SQL structured type value in the database.
<P>
SQL <code>REF</code> values are stored in a table that contains
instances of a referenceable SQL structured type, and each <code>REF</code>
value is a unique identifier for one instance in that table.
An SQL <code>REF</code> value may be used in place of the
SQL structured type it references, either as a column value in a
table or an attribute value in a structured type.
<P>
Because an SQL <code>REF</code> value is a logical pointer to an
SQL structured type, a <code>Ref</code> object is by default also a logical
pointer. Thus, retrieving an SQL <code>REF</code> value as
a <code>Ref</code> object does not materialize
the attributes of the structured type on the client.
<P>
A <code>Ref</code> object can be stored in the database using the
<code>PreparedStatement.setRef</code> method.
<p>
All methods on the <code>Ref</code> interface must be fully implemented if the
JDBC driver supports the data type.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.2</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="Struct.html" title="interface in java.sql"><code>Struct</code></a></dd>
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<td class="colFirst"><code><a href="../../../java.base/java/lang/String.html" title="class in java.lang">String</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getBaseTypeName()">getBaseTypeName</a></span>()</code></th>
<td class="colLast">
<div class="block">Retrieves the fully-qualified SQL name of the SQL structured type that
this <code>Ref</code> object references.</div>
</td>
</tr>
<tr class="rowColor" id="i1">
<td class="colFirst"><code><a href="../../../java.base/java/lang/Object.html" title="class in java.lang">Object</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getObject()">getObject</a></span>()</code></th>
<td class="colLast">
<div class="block">Retrieves the SQL structured type instance referenced by
this <code>Ref</code> object.</div>
</td>
</tr>
<tr class="altColor" id="i2">
<td class="colFirst"><code><a href="../../../java.base/java/lang/Object.html" title="class in java.lang">Object</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getObject(java.util.Map)">getObject</a></span>​(<a href="../../../java.base/java/util/Map.html" title="interface in java.util">Map</a><<a href="../../../java.base/java/lang/String.html" title="class in java.lang">String</a>,​<a href="../../../java.base/java/lang/Class.html" title="class in java.lang">Class</a><?>> map)</code></th>
<td class="colLast">
<div class="block">Retrieves the referenced object and maps it to a Java type
using the given type map.</div>
</td>
</tr>
<tr class="rowColor" id="i3">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setObject(java.lang.Object)">setObject</a></span>​(<a href="../../../java.base/java/lang/Object.html" title="class in java.lang">Object</a> value)</code></th>
<td class="colLast">
<div class="block">Sets the structured type value that this <code>Ref</code>
object references to the given instance of <code>Object</code>.</div>
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<h4>getBaseTypeName</h4>
<pre class="methodSignature"><a href="../../../java.base/java/lang/String.html" title="class in java.lang">String</a> getBaseTypeName()
throws <a href="SQLException.html" title="class in java.sql">SQLException</a></pre>
<div class="block">Retrieves the fully-qualified SQL name of the SQL structured type that
this <code>Ref</code> object references.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the fully-qualified SQL name of the referenced SQL structured type</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="SQLException.html" title="class in java.sql">SQLException</a></code> - if a database access error occurs</dd>
<dd><code><a href="SQLFeatureNotSupportedException.html" title="class in java.sql">SQLFeatureNotSupportedException</a></code> - if the JDBC driver does not support
this method</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.2</dd>
</dl>
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<a id="getObject(java.util.Map)">
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<h4>getObject</h4>
<pre class="methodSignature"><a href="../../../java.base/java/lang/Object.html" title="class in java.lang">Object</a> getObject​(<a href="../../../java.base/java/util/Map.html" title="interface in java.util">Map</a><<a href="../../../java.base/java/lang/String.html" title="class in java.lang">String</a>,​<a href="../../../java.base/java/lang/Class.html" title="class in java.lang">Class</a><?>> map)
throws <a href="SQLException.html" title="class in java.sql">SQLException</a></pre>
<div class="block">Retrieves the referenced object and maps it to a Java type
using the given type map.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>map</code> - a <code>java.util.Map</code> object that contains
the mapping to use (the fully-qualified name of the SQL
structured type being referenced and the class object for
<code>SQLData</code> implementation to which the SQL
structured type will be mapped)</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a Java <code>Object</code> that is the custom mapping for
the SQL structured type to which this <code>Ref</code>
object refers</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="SQLException.html" title="class in java.sql">SQLException</a></code> - if a database access error occurs</dd>
<dd><code><a href="SQLFeatureNotSupportedException.html" title="class in java.sql">SQLFeatureNotSupportedException</a></code> - if the JDBC driver does not support
this method</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.4</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="#setObject(java.lang.Object)"><code>setObject(java.lang.Object)</code></a></dd>
</dl>
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<h4>getObject</h4>
<pre class="methodSignature"><a href="../../../java.base/java/lang/Object.html" title="class in java.lang">Object</a> getObject()
throws <a href="SQLException.html" title="class in java.sql">SQLException</a></pre>
<div class="block">Retrieves the SQL structured type instance referenced by
this <code>Ref</code> object. If the connection's type map has an entry
for the structured type, the instance will be custom mapped to
the Java class indicated in the type map. Otherwise, the
structured type instance will be mapped to a <code>Struct</code> object.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a Java <code>Object</code> that is the mapping for
the SQL structured type to which this <code>Ref</code>
object refers</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="SQLException.html" title="class in java.sql">SQLException</a></code> - if a database access error occurs</dd>
<dd><code><a href="SQLFeatureNotSupportedException.html" title="class in java.sql">SQLFeatureNotSupportedException</a></code> - if the JDBC driver does not support
this method</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.4</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="#setObject(java.lang.Object)"><code>setObject(java.lang.Object)</code></a></dd>
</dl>
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<h4>setObject</h4>
<pre class="methodSignature">void setObject​(<a href="../../../java.base/java/lang/Object.html" title="class in java.lang">Object</a> value)
throws <a href="SQLException.html" title="class in java.sql">SQLException</a></pre>
<div class="block">Sets the structured type value that this <code>Ref</code>
object references to the given instance of <code>Object</code>.
The driver converts this to an SQL structured type when it
sends it to the database.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>value</code> - an <code>Object</code> representing the SQL
structured type instance that this
<code>Ref</code> object will reference</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="SQLException.html" title="class in java.sql">SQLException</a></code> - if a database access error occurs</dd>
<dd><code><a href="SQLFeatureNotSupportedException.html" title="class in java.sql">SQLFeatureNotSupportedException</a></code> - if the JDBC driver does not support
this method</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.4</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="#getObject()"><code>getObject()</code></a>,
<a href="#getObject(java.util.Map)"><code>getObject(Map)</code></a>,
<a href="PreparedStatement.html#setObject(int,java.lang.Object)"><code>PreparedStatement.setObject(int, Object)</code></a>,
<a href="CallableStatement.html#setObject(java.lang.String,java.lang.Object)"><code>CallableStatement.setObject(String, Object)</code></a></dd>
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