tomee-8.0/javadoc/javax/persistence/Column.html - tomee-site-pub - Git at Google

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 <h2 title="Annotation Type Column" class="title">Annotation Type Column</h2>
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 <pre>@Target(value={METHOD,FIELD})
  @Retention(value=RUNTIME)
 public @interface <span class="memberNameLabel">Column</span></pre>
 <div class="block">Specifies the mapped column for a persistent property or field.
  If no <code>Column</code> annotation is specified, the default values apply.

  <blockquote><pre>
     Example 1:

     &#064;Column(name="DESC", nullable=false, length=512)
     public String getDescription() { return description; }

     Example 2:

     &#064;Column(name="DESC",
             columnDefinition="CLOB NOT NULL",
             table="EMP_DETAIL")
     &#064;Lob
     public String getDescription() { return description; }

     Example 3:

     &#064;Column(name="ORDER_COST", updatable=false, precision=12, scale=2)
     public BigDecimal getCost() { return cost; }

  </pre></blockquote></div>
 <dl>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>Java Persistence 1.0</dd>
 </dl>
 </li>
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 <!-- =========== ANNOTATION TYPE OPTIONAL MEMBER SUMMARY =========== -->
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 <h3>Optional Element Summary</h3>
 <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Optional Element Summary table, listing optional elements, and an explanation">
 <caption><span>Optional Elements</span><span class="tabEnd">&nbsp;</span></caption>
 <tr>
 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colLast" scope="col">Optional Element and Description</th>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/Column.html#columnDefinition--">columnDefinition</a></span></code>
 <div class="block">(Optional) The SQL fragment that is used when
  generating the DDL for the column.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/Column.html#insertable--">insertable</a></span></code>
 <div class="block">(Optional) Whether the column is included in SQL INSERT
  statements generated by the persistence provider.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/Column.html#length--">length</a></span></code>
 <div class="block">(Optional) The column length.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/Column.html#name--">name</a></span></code>
 <div class="block">(Optional) The name of the column.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/Column.html#nullable--">nullable</a></span></code>
 <div class="block">(Optional) Whether the database column is nullable.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/Column.html#precision--">precision</a></span></code>
 <div class="block">(Optional) The precision for a decimal (exact numeric)
  column.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/Column.html#scale--">scale</a></span></code>
 <div class="block">(Optional) The scale for a decimal (exact numeric) column.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/Column.html#table--">table</a></span></code>
 <div class="block">(Optional) The name of the table that contains the column.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/Column.html#unique--">unique</a></span></code>
 <div class="block">(Optional) Whether the column is a unique key.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/Column.html#updatable--">updatable</a></span></code>
 <div class="block">(Optional) Whether the column is included in SQL UPDATE
  statements generated by the persistence provider.</div>
 </td>
 </tr>
 </table>
 </li>
 </ul>
 </li>
 </ul>
 </div>
 <div class="details">
 <ul class="blockList">
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 <!-- ============ ANNOTATION TYPE MEMBER DETAIL =========== -->
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 <h3>Element Detail</h3>
 <a name="name--">
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 <li class="blockList">
 <h4>name</h4>
 <pre>public abstract&nbsp;java.lang.String&nbsp;name</pre>
 <div class="block">(Optional) The name of the column. Defaults to
  the property or field name.</div>
 <dl>
 <dt>Default:</dt>
 <dd>""</dd>
 </dl>
 </li>
 </ul>
 </li>
 </ul>
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 <li class="blockList"><a name="unique--">
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 <h4>unique</h4>
 <pre>public abstract&nbsp;boolean&nbsp;unique</pre>
 <div class="block">(Optional) Whether the column is a unique key.  This is a
  shortcut for the <code>UniqueConstraint</code> annotation at the table
  level and is useful for when the unique key constraint
  corresponds to only a single column. This constraint applies
  in addition to any constraint entailed by primary key mapping and
  to constraints specified at the table level.</div>
 <dl>
 <dt>Default:</dt>
 <dd>false</dd>
 </dl>
 </li>
 </ul>
 </li>
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 <h4>nullable</h4>
 <pre>public abstract&nbsp;boolean&nbsp;nullable</pre>
 <div class="block">(Optional) Whether the database column is nullable.</div>
 <dl>
 <dt>Default:</dt>
 <dd>true</dd>
 </dl>
 </li>
 </ul>
 </li>
 </ul>
 <ul class="blockList">
 <li class="blockList"><a name="insertable--">
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 </a>
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 <h4>insertable</h4>
 <pre>public abstract&nbsp;boolean&nbsp;insertable</pre>
 <div class="block">(Optional) Whether the column is included in SQL INSERT
  statements generated by the persistence provider.</div>
 <dl>
 <dt>Default:</dt>
 <dd>true</dd>
 </dl>
 </li>
 </ul>
 </li>
 </ul>
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 <h4>updatable</h4>
 <pre>public abstract&nbsp;boolean&nbsp;updatable</pre>
 <div class="block">(Optional) Whether the column is included in SQL UPDATE
  statements generated by the persistence provider.</div>
 <dl>
 <dt>Default:</dt>
 <dd>true</dd>
 </dl>
 </li>
 </ul>
 </li>
 </ul>
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 <li class="blockList"><a name="columnDefinition--">
 <!--   -->
 </a>
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 <h4>columnDefinition</h4>
 <pre>public abstract&nbsp;java.lang.String&nbsp;columnDefinition</pre>
 <div class="block">(Optional) The SQL fragment that is used when
  generating the DDL for the column.
  <p> Defaults to the generated SQL to create a
  column of the inferred type.</div>
 <dl>
 <dt>Default:</dt>
 <dd>""</dd>
 </dl>
 </li>
 </ul>
 </li>
 </ul>
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 <h4>table</h4>
 <pre>public abstract&nbsp;java.lang.String&nbsp;table</pre>
 <div class="block">(Optional) The name of the table that contains the column.
  If absent the column is assumed to be in the primary table.</div>
 <dl>
 <dt>Default:</dt>
 <dd>""</dd>
 </dl>
 </li>
 </ul>
 </li>
 </ul>
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 </a>
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 <h4>length</h4>
 <pre>public abstract&nbsp;int&nbsp;length</pre>
 <div class="block">(Optional) The column length. (Applies only if a
  string-valued column is used.)</div>
 <dl>
 <dt>Default:</dt>
 <dd>255</dd>
 </dl>
 </li>
 </ul>
 </li>
 </ul>
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 <h4>precision</h4>
 <pre>public abstract&nbsp;int&nbsp;precision</pre>
 <div class="block">(Optional) The precision for a decimal (exact numeric)
  column. (Applies only if a decimal column is used.)
  Value must be set by developer if used when generating
  the DDL for the column.</div>
 <dl>
 <dt>Default:</dt>
 <dd>0</dd>
 </dl>
 </li>
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 </li>
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 <h4>scale</h4>
 <pre>public abstract&nbsp;int&nbsp;scale</pre>
 <div class="block">(Optional) The scale for a decimal (exact numeric) column.
  (Applies only if a decimal column is used.)</div>
 <dl>
 <dt>Default:</dt>
 <dd>0</dd>
 </dl>
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	<div class="subTitle">javax.persistence</div>
	<h2 title="Annotation Type Column" class="title">Annotation Type Column</h2>
	</div>
	<div class="contentContainer">
	<div class="description">
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	<br>
	<pre>@Target(value={METHOD,FIELD})
	@Retention(value=RUNTIME)
	public @interface <span class="memberNameLabel">Column</span></pre>
	<div class="block">Specifies the mapped column for a persistent property or field.
	If no <code>Column</code> annotation is specified, the default values apply.

	<blockquote><pre>
	Example 1:

	@Column(name="DESC", nullable=false, length=512)
	public String getDescription() { return description; }

	Example 2:

	@Column(name="DESC",
	columnDefinition="CLOB NOT NULL",
	table="EMP_DETAIL")
	@Lob
	public String getDescription() { return description; }

	Example 3:

	@Column(name="ORDER_COST", updatable=false, precision=12, scale=2)
	public BigDecimal getCost() { return cost; }

	</pre></blockquote></div>
	<dl>
	<dt><span class="simpleTagLabel">Since:</span></dt>
	<dd>Java Persistence 1.0</dd>
	</dl>
	</li>
	</ul>
	</div>
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	<!-- =========== ANNOTATION TYPE OPTIONAL MEMBER SUMMARY =========== -->
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	<!-- -->
	</a>
	<h3>Optional Element Summary</h3>
	<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Optional Element Summary table, listing optional elements, and an explanation">
	<caption><span>Optional Elements</span><span class="tabEnd"> </span></caption>
	<tr>
	<th class="colFirst" scope="col">Modifier and Type</th>
	<th class="colLast" scope="col">Optional Element and Description</th>
	</tr>
	<tr class="altColor">
	<td class="colFirst"><code>java.lang.String</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/Column.html#columnDefinition--">columnDefinition</a></span></code>
	<div class="block">(Optional) The SQL fragment that is used when
	generating the DDL for the column.</div>
	</td>
	</tr>
	<tr class="rowColor">
	<td class="colFirst"><code>boolean</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/Column.html#insertable--">insertable</a></span></code>
	<div class="block">(Optional) Whether the column is included in SQL INSERT
	statements generated by the persistence provider.</div>
	</td>
	</tr>
	<tr class="altColor">
	<td class="colFirst"><code>int</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/Column.html#length--">length</a></span></code>
	<div class="block">(Optional) The column length.</div>
	</td>
	</tr>
	<tr class="rowColor">
	<td class="colFirst"><code>java.lang.String</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/Column.html#name--">name</a></span></code>
	<div class="block">(Optional) The name of the column.</div>
	</td>
	</tr>
	<tr class="altColor">
	<td class="colFirst"><code>boolean</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/Column.html#nullable--">nullable</a></span></code>
	<div class="block">(Optional) Whether the database column is nullable.</div>
	</td>
	</tr>
	<tr class="rowColor">
	<td class="colFirst"><code>int</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/Column.html#precision--">precision</a></span></code>
	<div class="block">(Optional) The precision for a decimal (exact numeric)
	column.</div>
	</td>
	</tr>
	<tr class="altColor">
	<td class="colFirst"><code>int</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/Column.html#scale--">scale</a></span></code>
	<div class="block">(Optional) The scale for a decimal (exact numeric) column.</div>
	</td>
	</tr>
	<tr class="rowColor">
	<td class="colFirst"><code>java.lang.String</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/Column.html#table--">table</a></span></code>
	<div class="block">(Optional) The name of the table that contains the column.</div>
	</td>
	</tr>
	<tr class="altColor">
	<td class="colFirst"><code>boolean</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/Column.html#unique--">unique</a></span></code>
	<div class="block">(Optional) Whether the column is a unique key.</div>
	</td>
	</tr>
	<tr class="rowColor">
	<td class="colFirst"><code>boolean</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/Column.html#updatable--">updatable</a></span></code>
	<div class="block">(Optional) Whether the column is included in SQL UPDATE
	statements generated by the persistence provider.</div>
	</td>
	</tr>
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	<h4>name</h4>
	<pre>public abstract java.lang.String name</pre>
	<div class="block">(Optional) The name of the column. Defaults to
	the property or field name.</div>
	<dl>
	<dt>Default:</dt>
	<dd>""</dd>
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	<pre>public abstract boolean unique</pre>
	<div class="block">(Optional) Whether the column is a unique key. This is a
	shortcut for the <code>UniqueConstraint</code> annotation at the table
	level and is useful for when the unique key constraint
	corresponds to only a single column. This constraint applies
	in addition to any constraint entailed by primary key mapping and
	to constraints specified at the table level.</div>
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	<div class="block">(Optional) Whether the database column is nullable.</div>
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	<dd>true</dd>
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	<pre>public abstract boolean insertable</pre>
	<div class="block">(Optional) Whether the column is included in SQL INSERT
	statements generated by the persistence provider.</div>
	<dl>
	<dt>Default:</dt>
	<dd>true</dd>
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	<pre>public abstract boolean updatable</pre>
	<div class="block">(Optional) Whether the column is included in SQL UPDATE
	statements generated by the persistence provider.</div>
	<dl>
	<dt>Default:</dt>
	<dd>true</dd>
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	<pre>public abstract java.lang.String columnDefinition</pre>
	<div class="block">(Optional) The SQL fragment that is used when
	generating the DDL for the column.
	<p> Defaults to the generated SQL to create a
	column of the inferred type.</div>
	<dl>
	<dt>Default:</dt>
	<dd>""</dd>
	</dl>
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	<h4>table</h4>
	<pre>public abstract java.lang.String table</pre>
	<div class="block">(Optional) The name of the table that contains the column.
	If absent the column is assumed to be in the primary table.</div>
	<dl>
	<dt>Default:</dt>
	<dd>""</dd>
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	<h4>length</h4>
	<pre>public abstract int length</pre>
	<div class="block">(Optional) The column length. (Applies only if a
	string-valued column is used.)</div>
	<dl>
	<dt>Default:</dt>
	<dd>255</dd>
	</dl>
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	<h4>precision</h4>
	<pre>public abstract int precision</pre>
	<div class="block">(Optional) The precision for a decimal (exact numeric)
	column. (Applies only if a decimal column is used.)
	Value must be set by developer if used when generating
	the DDL for the column.</div>
	<dl>
	<dt>Default:</dt>
	<dd>0</dd>
	</dl>
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	<pre>public abstract int scale</pre>
	<div class="block">(Optional) The scale for a decimal (exact numeric) column.
	(Applies only if a decimal column is used.)</div>
	<dl>
	<dt>Default:</dt>
	<dd>0</dd>
	</dl>
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