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[#1914] Document the fact that SELECT * is performed by leaving the

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SELECT list empty
This commit is contained in:
Lukas Eder 2013-02-14 13:42:50 +01:00
parent fffc16439b
commit 3dd2803eea
1 changed files with 15 additions and 0 deletions
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jOOQ-website/src/main/resources/manual-3.0.xml
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@ -1664,6 +1664,21 @@ Select<?> select2 = create.selectOne();]]></java>
<java><![CDATA[Select<?> select1 = create.selectDistinct(BOOK.TITLE);]]></java>
</code-pair>
<h3>SELECT *</h3>
<p>
jOOQ does not explicitly support the asterisk operator in projections. However, you can omit the projection as in these examples:
</p>
<java><![CDATA[// Explicitly selects all columns available from BOOK
create.select().from(BOOK);
// Explicitly selects all columns available from BOOK and AUTHOR
create.select().from(BOOK, AUTHOR);
create.select().from(BOOK).crossJoin(AUTHOR);
// Renders a SELECT * statement, as columns are unknown to jOOQ
create.select().from(tableByName("BOOK"));]]></java>
<h3>Typesafe projections with degree up to {max-row-degree}</h3>
<p>
Since jOOQ 3.0, <reference id="record-n" title="records"/> and <reference id="row-value-expressions" title="row value expressions"/> up to degree {max-row-degree} are now generically typesafe. This is reflected by an overloaded <code>SELECT</code> (and <code>SELECT DISTINCT</code>) API in both Factory and Executor. An extract from Factory: