Make SET really not start a transaction.

diff --git a/doc/src/sgml/ref/reset.sgml b/doc/src/sgml/ref/reset.sgml
index a21aa0239fb0c89d85621f2c5a11ece1bb3ed107..ed36d549c52cb2e5d6b59f9a3fe9e0b5e4b6884e 100644 (file)
--- a/doc/src/sgml/ref/reset.sgml
+++ b/doc/src/sgml/ref/reset.sgml
@@ -1,5 +1,5 @@
 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/ref/reset.sgml,v 1.16 2002/10/09 04:59:38 momjian Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/ref/reset.sgml,v 1.17 2002/10/13 16:55:05 tgl Exp $
 PostgreSQL documentation
 -->
 
@@ -68,7 +68,7 @@ SET <replaceable class="parameter">variable</replaceable> TO DEFAULT
   </para>
 
   <para>
-   See the <command>SHOW</> manual page for details on the transaction
+   See the <command>SET</> manual page for details on the transaction
    behavior of <command>RESET</>.
   </para>
 

diff --git a/doc/src/sgml/ref/set.sgml b/doc/src/sgml/ref/set.sgml
index 4ee941be37bf54a30b0f2505a87bb327abba352e..71e35b50a5e56f20fd3a7e935f05c174362d236e 100644 (file)
--- a/doc/src/sgml/ref/set.sgml
+++ b/doc/src/sgml/ref/set.sgml
@@ -1,5 +1,5 @@
 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/ref/set.sgml,v 1.67 2002/10/09 16:27:48 momjian Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/ref/set.sgml,v 1.68 2002/10/13 16:55:05 tgl Exp $
 PostgreSQL documentation
 -->
 
@@ -109,9 +109,10 @@ SET [ SESSION | LOCAL ] TIME ZONE { <replaceable class="PARAMETER">timezone</rep
   </para>
 
   <para>
-   With <literal>autocommit</> set to <literal>off</>, <command>SET</>
+   Even with <literal>autocommit</> set to <literal>off</>, <command>SET</>
    does not start a new transaction block. See the
-   <literal>autocommit</> section of the documentation for details.
+   <literal>autocommit</> section of the <citetitle>Administrator's
+   Guide</citetitle> for details.
   </para>
 
   <para>

diff --git a/doc/src/sgml/ref/show.sgml b/doc/src/sgml/ref/show.sgml
index f42893ffb25f71ff3dbcbe06af31cdd953b3744e..2f086ee8a2d24915d3572c79b6a86ed46d1e2169 100644 (file)
--- a/doc/src/sgml/ref/show.sgml
+++ b/doc/src/sgml/ref/show.sgml
@@ -1,5 +1,5 @@
 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/ref/show.sgml,v 1.21 2002/09/01 01:59:48 momjian Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/ref/show.sgml,v 1.22 2002/10/13 16:55:05 tgl Exp $
 PostgreSQL documentation
 -->
 
@@ -60,6 +60,13 @@ SHOW ALL
    command-line flag when starting the
    <application>postmaster</application>.
   </para>
+
+  <para>
+   Even with <literal>autocommit</> set to <literal>off</>, <command>SHOW</>
+   does not start a new transaction block. See the
+   <literal>autocommit</> section of the <citetitle>Administrator's
+   Guide</citetitle> for details.
+  </para>
  </refsect1>
 
  <refsect1>

diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 2936e9b4c707b155553ca40bebbae919873729f6..fc878e678c5912ed65645d2ab36c2cdec68d22c1 100644 (file)
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -1,5 +1,5 @@
 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.144 2002/10/09 04:59:38 momjian Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.145 2002/10/13 16:55:05 tgl Exp $
 -->
 
 <Chapter Id="runtime">
@@ -1236,7 +1236,7 @@ env PGOPTIONS='-c geqo=off' psql
    <command>BEGIN</> with no matching <command>COMMIT</> has been
    given).
    If set to false, <productname>PostgreSQL</productname> will
-   commit the commands only when receiving an explicit
+   commit only upon receiving an explicit
    <command>COMMIT</> command. This mode can also be thought of as
    implicitly issuing <command>BEGIN</> whenever a command is
    received that is not already inside a transaction block. The
@@ -1247,16 +1247,16 @@ env PGOPTIONS='-c geqo=off' psql
        </para>
        <note>
         <para>
-    With <varname>autocommit</> set to false, <command>SET</>,
+    Even with <varname>autocommit</> set to false, <command>SET</>,
     <command>SHOW</>, and <command>RESET</> do not start new
     transaction blocks. They are run in their own transactions.
-    Once another command is issued, multi-statement transaction
-    behavior begins and any <command>SET</>, <command>SHOW</>, or
+    Once another command is issued, a transaction block
+    begins and any <command>SET</>, <command>SHOW</>, or
     <command>RESET</> commands are considered to be part of the
     transaction, i.e. they are committed or rolled back depending
-    on the completion status of the transaction. To have
-    <command>SET</>, <command>SHOW</>, and <command>RESET</>
-    commands at the start of a transaction, use <command>BEGIN</>
+    on the completion status of the transaction. To execute a
+    <command>SET</>, <command>SHOW</>, or <command>RESET</>
+    command at the start of a transaction block, use <command>BEGIN</>
     first.
         </para>
        </note>

diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1b6032660953fe1686b93e8be90540fbc954ffef..1b636c18d73ae3a51af3d937f35fc5bb7124cf07 100644 (file)
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *   $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.300 2002/10/09 04:59:38 momjian Exp $
+ *   $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.301 2002/10/13 16:55:05 tgl Exp $
  *
  * NOTES
  *   this is the "main" module of the postgres backend and
@@ -76,7 +76,6 @@ char     *debug_query_string; /* for pgmonitor and
 CommandDest whereToSendOutput = Debug;
 
 extern int StatementTimeout;
-extern bool autocommit;
 
 static bool dontExecute = false;
 
@@ -620,15 +619,11 @@ pg_exec_query_string(StringInfo query_string, /* string to execute */
    foreach(parsetree_item, parsetree_list)
    {
        Node       *parsetree = (Node *) lfirst(parsetree_item);
-       bool        isTransactionStmt;
        const char *commandTag;
        char        completionTag[COMPLETION_TAG_BUFSIZE];
        List       *querytree_list,
                   *querytree_item;
 
-       /* Transaction control statements need some special handling */
-       isTransactionStmt = IsA(parsetree, TransactionStmt);
-
        /*
         * First we set the command-completion tag to the main query (as
         * opposed to each of the others that may be generated by analyze
@@ -653,7 +648,7 @@ pg_exec_query_string(StringInfo query_string,   /* string to execute */
        {
            bool        allowit = false;
 
-           if (isTransactionStmt)
+           if (IsA(parsetree, TransactionStmt))
            {
                TransactionStmt *stmt = (TransactionStmt *) parsetree;
 
@@ -698,6 +693,7 @@ pg_exec_query_string(StringInfo query_string,   /* string to execute */
        foreach(querytree_item, querytree_list)
        {
            Query      *querytree = (Query *) lfirst(querytree_item);
+           bool        endTransactionBlock = false;
 
            /* Make sure we are in a transaction command */
            if (!xact_started)
@@ -733,6 +729,13 @@ pg_exec_query_string(StringInfo query_string,  /* string to execute */
                    IsA(utilityStmt, ReindexStmt))
                    SetQuerySnapshot();
 
+               /* end transaction block if transaction or variable stmt */
+               if (IsA(utilityStmt, TransactionStmt) ||
+                   IsA(utilityStmt, VariableSetStmt) ||
+                   IsA(utilityStmt, VariableShowStmt) ||
+                   IsA(utilityStmt, VariableResetStmt))
+                   endTransactionBlock = true;
+
                if (querytree->originalQuery)
                {
                    /* utility statement can override default tag string */
@@ -805,7 +808,7 @@ pg_exec_query_string(StringInfo query_string,   /* string to execute */
             * visible to subsequent ones.  In particular we'd better do
             * so before checking constraints.
             */
-           if (!isTransactionStmt)
+           if (!endTransactionBlock)
                CommandCounterIncrement();
 
            /*
@@ -820,13 +823,13 @@ pg_exec_query_string(StringInfo query_string, /* string to execute */
            MemoryContextResetAndDeleteChildren(CurrentMemoryContext);
 
            /*
-            * If this was a transaction control statement, commit it and
-            * arrange to start a new xact command for the next command
-            * (if any).
+            * If this was a transaction control statement or a variable
+            * set/show/reset statement, commit it and arrange to start a
+            * new xact command for the next command (if any).
             */
-           if (isTransactionStmt)
+           if (endTransactionBlock)
            {
-               finish_xact_command(false);
+               finish_xact_command(true);
                xact_started = false;
            }
        }                       /* end loop over queries generated from a
@@ -844,19 +847,7 @@ pg_exec_query_string(StringInfo query_string,  /* string to execute */
         */
        if (lnext(parsetree_item) == NIL && xact_started)
        {
-           /*
-            *  Don't allow SET/SHOW/RESET to start a new transaction
-            *  with autocommit off.  We do this by forcing a COMMIT
-            *  when these commands start a transaction.
-            */
-           if (autocommit ||
-               IsTransactionState() ||
-               (strcmp(commandTag, "SET") != 0 &&
-                strcmp(commandTag, "SHOW") != 0 &&
-                strcmp(commandTag, "RESET") != 0))
-               finish_xact_command(false);
-           else
-               finish_xact_command(true);
+           finish_xact_command(false);
            xact_started = false;
        }
 
@@ -1733,7 +1724,7 @@ PostgresMain(int argc, char *argv[], const char *username)
    if (!IsUnderPostmaster)
    {
        puts("\nPOSTGRES backend interactive interface ");
-       puts("$Revision: 1.300 $ $Date: 2002/10/09 04:59:38 $\n");
+       puts("$Revision: 1.301 $ $Date: 2002/10/13 16:55:05 $\n");
    }
 
    /*