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Commit70b59a2

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Doc: remove misleading info about ecpg's CONNECT/DISCONNECT DEFAULT.
As far as I can see, ecpg has no notion of a "default" openconnection. You can do "CONNECT TO DEFAULT" but that just specifiesletting libpq use all its default connection parameters --- theresulting connection is not special subsequently. In particular,SET CONNECTION = DEFAULT and DISCONNECT DEFAULT simply act on aconnection named DEFAULT, if you've made one; they do not havespecial lookup rules. But the documentation of these commandsmakes it look like they do.Simplest fix, I think, is just to remove the paras suggesting thatDEFAULT is special here.Also, SET CONNECTION *does* have one special lookup rule, whichis that it recognizes CURRENT as an alias for the currently selectedconnection. SET CONNECTION = CURRENT is a no-op, so it's prettyuseless, but nonetheless it does something different from selectinga connection by name; so we'd better document it.Per report from Sylvain Frandaz. Back-patch to all supportedversions.Discussion:https://postgr.es/m/169824721149.1769274.1553568436817652238@wrigleys.postgresql.org
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‎doc/src/sgml/ecpg.sgml

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@@ -412,12 +412,6 @@ EXEC SQL DISCONNECT <optional><replaceable>connection</replaceable></optional>;
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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<literal>DEFAULT</literal>
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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<literal>CURRENT</literal>
@@ -7093,7 +7087,6 @@ EXEC SQL DEALLOCATE DESCRIPTOR mydesc;
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<synopsis>
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DISCONNECT <replaceable class="parameter">connection_name</replaceable>
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DISCONNECT [ CURRENT ]
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DISCONNECT DEFAULT
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DISCONNECT ALL
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</synopsis>
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</refsynopsisdiv>
@@ -7134,15 +7127,6 @@ DISCONNECT ALL
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>DEFAULT</literal></term>
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<listitem>
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<para>
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Close the default connection.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>ALL</literal></term>
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<listitem>
@@ -7161,13 +7145,11 @@ DISCONNECT ALL
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int
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main(void)
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{
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EXEC SQL CONNECT TO testdb AS DEFAULT USER testuser;
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EXEC SQL CONNECT TO testdb AS con1 USER testuser;
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EXEC SQL CONNECT TO testdb AS con2 USER testuser;
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EXEC SQL CONNECT TO testdb AS con3 USER testuser;
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EXEC SQL DISCONNECT CURRENT; /* close con3 */
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EXEC SQL DISCONNECT DEFAULT; /* close DEFAULT */
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EXEC SQL DISCONNECT ALL; /* close con2 and con1 */
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return 0;
@@ -7736,10 +7718,10 @@ SET CONNECTION [ TO | = ] <replaceable class="parameter">connection_name</replac
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</varlistentry>
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<varlistentry>
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<term><literal>DEFAULT</literal></term>
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<term><literal>CURRENT</literal></term>
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<listitem>
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<para>
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Set the connection to thedefault connection.
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Set the connection to thecurrent connection (thus, nothing happens).
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</para>
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</listitem>
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</varlistentry>

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