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<title>Generating tables from entities</title>
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<p><a id="CIHJIGBE" name="CIHJIGBE"></a></p>
<div class="sect1"><!-- infolevel="all" infotype="General" -->
<h1>Generating tables from entities</h1>
<p><a id="sthref301" name="sthref301"></a><a id="sthref302" name="sthref302"></a><a id="sthref303" name="sthref303"></a>When using a vendor-specific platform, you can create a DDL script from your persistent entities.</p>
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<div class="inftblnote"><br />
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<p class="notep1">Note:</p>
<p>The DDL script will <code>DROP</code> existing tables on the database and <code>CREATE</code> new tables, based on the entities in your project.</p>
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<p>To generate a DDL script:</p>
<ol>
<li>
<p>Right-click the JPA project in the <span class="gui-object-title">Project Explorer</span> and select <span class="gui-object-action">JPA Tools > Generate Tables from Entities</span>.</p>
<img src="img/generate_tables_from_entities.png" alt="JPA Tools > Generate Tables from Entities" title="JPA Tools > Generate Tables from Entities" /><br /></li>
<li>
<p>On the <a href="reference019.htm#CACHAJEG">Schema Generation</a> page, select the generation output mode.</p>
<div class="figure"><a id="sthref304" name="sthref304"></a>
<p class="titleinfigure">Schema Generation</p>
<img src="img/generate_tables.png" alt="" title="" /><br /></div>
<!-- class="figure" --></li>
<li>
<p>Click <span class="bold">Finish</span>. Dali generates the selected DDL for the entities, as shown in <a href="#CIHJAHAC">Example: Sample Generated Output</a>.</p>
</li>
</ol>
<p>If you are not currently connected to the database, the Database Connection page appears. Select your database connection and schema, and click <span class="bold">Reconnect</span>.</p>
<div class="example"><a id="CIHJAHAC" name="CIHJAHAC"></a>
<p class="titleinexample">Sample Generated Output</p>
<pre xml:space="preserve" class="oac_no_warn">
[EL Config]: metadata: The access type for the persistent class [class quickstart.demo.model.Address] is set to [FIELD].
[EL Config]: metadata: The alias name for the entity class [class quickstart.demo.model.Address] is being defaulted to: Address.
[EL Config]: metadata: The table name for entity [class quickstart.demo.model.Address] is being defaulted to: ADDRESS.
[EL Config]: metadata: The column name for element [street] is being defaulted to: STREET.
[EL Config]: metadata: The column name for element [city] is being defaulted to: CITY.
[EL Config]: metadata: The column name for element [country] is being defaulted to: COUNTRY.
[EL Info]: EclipseLink, version: Eclipse Persistence Services - 2.4.0.vXXXX
[EL Fine]: connection: Detected database platform: org.eclipse.persistence.platform.database.JavaDBPlatform
[EL Config]: connection: Connection(7896086)--connecting(DatabaseLogin(
platform=>JavaDBPlatform
user name=> ""
datasource URL=> "jdbc:derby:C:\MyDB;create=true"
))
[EL Config]: connection: Connection(28523022)--Connected: jdbc:derby:C:\MyDB
User: APP
Database: Apache Derby Version: 10.9.1.0 - (XXXX)
Driver: Apache Derby Embedded JDBC Driver Version: 10.9.1.0 - (XXXX)
[EL Config]: connection: Connection(27817788)--connecting(DatabaseLogin(
platform=>JavaDBPlatform
user name=> ""
datasource URL=> "jdbc:derby:C:\MyDB;create=true"
))
[EL Config]: connection: Connection(11557581)--Connected: jdbc:derby:C:\MyDB
User: APP
Database: Apache Derby Version: 10.9.1.0 - (XXXX)
Driver: Apache Derby Embedded JDBC Driver Version: 10.9.1.0 - (XXXX)
[EL Info]: connection: file:/C:/workspace/runtime-EclipseApplication/QuickStart/build/classes/_QuickStart_url=jdbc:derby:C:\MyDB;create=true login successful
[EL Fine]: sql: Connection(28523022)--DROP TABLE ADDRESS
[EL Fine]: sql: Connection(28523022)--CREATE TABLE ADDRESS (ADDRESS_ID BIGINT NOT NULL, CITY VARCHAR(255), COUNTRY VARCHAR(255), P_CODE VARCHAR(255), PROVINCE VARCHAR(255), STREET VARCHAR(255), PRIMARY KEY (ADDRESS_ID))
[EL Config]: connection: Connection(28523022)--disconnect
[EL Info]: connection: file:/C://workspace/runtime-EclipseApplication/QuickStart/build/classes/_QuickStart_url=jdbc:derby:C:\MyDB;create=true logout successful
[EL Config]: connection: Connection(7896086)--disconnect
[EL Config]: connection: Connection(11557581)--disconnect
</pre></div>
<!-- class="example" -->
<a id="sthref305" name="sthref305"></a>
<p class="subhead2">Related tasks</p>
<ul>
<li>
<p><a href="task_create_jpa_entity.htm#BABFBJBG">Creating a JPA entity</a></p>
</li>
</ul>
<a id="sthref306" name="sthref306"></a>
<p class="subhead2">Related reference</p>
<ul>
<li>
<p><a href="ref_project_properties.htm#BABJHBCI">Project Properties page – JPA</a></p>
</li>
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