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[#1801] Add Table.as(String, String...) to allow for creating a

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table aliases (correlation names) with derived column lists
This commit is contained in:
Lukas Eder 2013-01-03 23:29:08 +01:00
parent c9d12d8850
commit 6ea236e217
3 changed files with 25 additions and 32 deletions
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2
jOOQ/src/main/java/org/jooq/Table.java
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@ -123,7 +123,7 @@ public interface Table<R extends Record> extends FieldProvider, TableLike<R> {
* names.
* @return The table alias
*/
@Support({ CUBRID, DERBY, FIREBIRD, HSQLDB, POSTGRES, SQLSERVER, SYBASE })
@Support({ CUBRID, DERBY, FIREBIRD, HSQLDB, ORACLE, POSTGRES, SQLSERVER, SYBASE })
Table<R> as(String alias, String... fieldAliases);
/**

38
jOOQ/src/main/java/org/jooq/TableLike.java
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@ -35,7 +35,14 @@
*/
package org.jooq;
import org.jooq.conf.Settings;
import static org.jooq.SQLDialect.CUBRID;
import static org.jooq.SQLDialect.DERBY;
import static org.jooq.SQLDialect.FIREBIRD;
import static org.jooq.SQLDialect.HSQLDB;
import static org.jooq.SQLDialect.ORACLE;
import static org.jooq.SQLDialect.POSTGRES;
import static org.jooq.SQLDialect.SQLSERVER;
import static org.jooq.SQLDialect.SYBASE;
/**
* An object that can behave like a table (a table-like object)
@ -55,35 +62,16 @@ public interface TableLike<R extends Record> extends QueryPart {
/**
* The underlying aliased table representation of this object
* <p>
* This method is useful for things like
* <code>SELECT * FROM (SELECT * FROM x WHERE x.a = '1') [alias] WHERE ... </code>
* <p>
* Note that the case-sensitivity of the returned table depends on
* {@link Settings#getRenderNameStyle()}. By default, table aliases are
* quoted, and thus case-sensitive!
*
* @see Table#as(String)
*/
Table<R> asTable(String alias);
/**
* The underlying aliased table representation of this object
* <p>
* This method is useful for things like
* <code><pre>
* SELECT alias.fieldAlias1, alias.fieldAlias2
* FROM (
* SELECT * FROM x WHERE x.a = '1'
* ) AS alias(fieldAlias1, fieldAlias2)
* WHERE ... </code>
* <p>
* Note, not all databases support derived column lists for their table
* aliases. On the other hand, some databases do support derived column
* lists, but only for derived tables. jOOQ will try to turn table
* references into derived tables to make this syntax work.
* <p>
* Note that the case-sensitivity of the returned table depends on
* {@link Settings#getRenderNameStyle()}. By default, table aliases are
* quoted, and thus case-sensitive!
*
* @see Table#as(String, String...)
*/
@Support({ CUBRID, DERBY, FIREBIRD, HSQLDB, ORACLE, POSTGRES, SQLSERVER, SYBASE })
Table<R> asTable(String alias, String... fieldAliases);
}

17
jOOQ/src/main/java/org/jooq/impl/Alias.java
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@ -95,14 +95,17 @@ class Alias<Q extends QueryPart> extends AbstractQueryPart {
// [#1801] Some databases don't support "derived column names" at
// all. They can be simulated using common table expressions
if (fieldAliases != null && simulateDerivedColumnList) {
context.keyword("(with")
.sql(" v");
context.sql("(").formatIndentStart().formatNewLine()
.keyword("with").sql(" v");
toSQLDerivedColumnList(context);
context.keyword(" as (select * from ")
context.sql(" ").keyword("as").sql(" (").formatIndentStart().formatNewLine()
.keyword("select * from").sql(" (")
.sql(wrapped)
.sql(") ")
.sql(")").formatIndentEnd().formatNewLine()
.sql(")").formatSeparator()
.keyword("select * from")
.sql(" v)");
.sql(" v").formatIndentEnd().formatNewLine()
.sql(")");
}
// [#1801] Some databases don't allow "derived column names" in
@ -113,8 +116,10 @@ class Alias<Q extends QueryPart> extends AbstractQueryPart {
// http://jira.cubrid.org/browse/ENGINE-96
// http://tracker.firebirdsql.org/browse/CORE-4025
else if (fieldAliases != null && asList(CUBRID, FIREBIRD, SQLSERVER, SYBASE).contains(dialect) && wrapped instanceof TableImpl) {
context.keyword("(select * from ")
context.sql("(").formatIndentStart().formatNewLine()
.keyword("select * from")
.sql(wrapped)
.formatIndentEnd().formatNewLine()
.sql(")");
}