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Allow IF NOT EXISTS when add a new enum label.

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If the label is already in the enum the statement becomes a no-op.
This will reduce the pain that comes from our not allowing this
operation inside a transaction block.

Andrew Dunstan, reviewed by Tom Lane and Magnus Hagander.
This commit is contained in:
Andrew Dunstan
2012-09-22 12:53:31 -04:00
parent 11e131854f
commit 6d12b68cd7
10 changed files with 89 additions and 14 deletions
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9
doc/src/sgml/ref/alter_type.sgml
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@ -28,7 +28,7 @@ ALTER TYPE <replaceable class="PARAMETER">name</replaceable> OWNER TO <replaceab
ALTER TYPE <replaceable class="PARAMETER">name</replaceable> RENAME ATTRIBUTE <replaceable class="PARAMETER">attribute_name</replaceable> TO <replaceable class="PARAMETER">new_attribute_name</replaceable>
ALTER TYPE <replaceable class="PARAMETER">name</replaceable> RENAME TO <replaceable class="PARAMETER">new_name</replaceable> [ CASCADE | RESTRICT ]
ALTER TYPE <replaceable class="PARAMETER">name</replaceable> SET SCHEMA <replaceable class="PARAMETER">new_schema</replaceable>
ALTER TYPE <replaceable class="PARAMETER">name</replaceable> ADD VALUE <replaceable class="PARAMETER">new_enum_value</replaceable> [ { BEFORE | AFTER } <replaceable class="PARAMETER">existing_enum_value</replaceable> ]
ALTER TYPE <replaceable class="PARAMETER">name</replaceable> ADD VALUE [ IF NOT EXISTS ] <replaceable class="PARAMETER">new_enum_value</replaceable> [ { BEFORE | AFTER } <replaceable class="PARAMETER">existing_enum_value</replaceable> ]
<phrase>where <replaceable class="PARAMETER">action</replaceable> is one of:</phrase>
@ -106,7 +106,7 @@ ALTER TYPE <replaceable class="PARAMETER">name</replaceable> ADD VALUE <replacea
</varlistentry>
<varlistentry>
<term><literal>ADD VALUE [ BEFORE | AFTER ]</literal></term>
<term><literal>ADD VALUE [ IF NOT EXISTS ] [ BEFORE | AFTER ]</literal></term>
<listitem>
<para>
This form adds a new value to an enum type. If the new value's place in
@ -114,6 +114,11 @@ ALTER TYPE <replaceable class="PARAMETER">name</replaceable> ADD VALUE <replacea
<literal>AFTER</literal>, then the new item is placed at the end of the
list of values.
</para>
<para>
If <literal>IF NOT EXISTS</literal is used, it is not an error if the
type already contains the new value, and no action is taken. Otherwise,
an error will occur if the new value is already present.
</para>
</listitem>
</varlistentry>