Add support for the 'txn' argument to date/time functions that works like

'now' but keeps the same time for the entire transaction.

FossilOrigin-Name: 5e4f45af96247e29910403a63ac148cb313b005f9c014b37a9a49d98f5fef9a6

6 files changed, 65 insertions, 15 deletions

diff --git a/manifest b/manifest
index b1319ebcd..d91cd340c 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Fix\sa\stest\sscript\sproblem\scausing\s"make\stest"\sto\sfail\sfor\snon-RBU\sbuilds.
-D 2023-02-07T18:41:23.632
+C Add\ssupport\sfor\sthe\s'txn'\sargument\sto\sdate/time\sfunctions\sthat\sworks\slike\n'now'\sbut\skeeps\sthe\ssame\stime\sfor\sthe\sentire\stransaction.
+D 2023-02-07T21:55:14.119
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -567,7 +567,7 @@ F src/build.c c55ab6d1b089ceef57160e840f05f692955ac90944c3d04fcf01d97fd7bfd08d
 F src/callback.c 4cd7225b26a97f7de5fee5ae10464bed5a78f2adefe19534cc2095b3a8ca484a
 F src/complete.c a3634ab1e687055cd002e11b8f43eb75c17da23e
 F src/ctime.c 20507cc0b0a6c19cd882fcd0eaeda32ae6a4229fb4b024cfdf3183043d9b703d
-F src/date.c 94ce83b4cd848a387680a5f920c9018c16655db778c4d36525af0a0f34679ac5
+F src/date.c ff2d10db98269759315c2048d3cc16cc135f7b39f394fa7442e37f9f9161892f
 F src/dbpage.c d47549716549311f79dc39fe5c8fb19390a6eb2c960f8e37c89a9c4de0c1052e
 F src/dbstat.c ec92074baa61d883de58c945162d9e666c13cd7cf3a23bc38b4d1c4d0b2c2bef
 F src/delete.c 86573edae75e3d3e9a8b590d87db8e47222103029df4f3e11fa56044459b514e
@@ -626,7 +626,7 @@ F src/shell.c.in 250817509dbf12e258e334fdcd87901e35a6b63dc285885fec5f577ebb67b49
 F src/sqlite.h.in e26116b4dba94903c78db0f3281493435cf70ee049e2e8270b1013fad740fdb1
 F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
 F src/sqlite3ext.h da473ce2b3d0ae407a6300c4a164589b9a6bfdbec9462688a8593ff16f3bb6e4
-F src/sqliteInt.h 43eeee1ea80543a0e40444bf53643ca259a2b1158ccfe859a6a6435b7358ecdd
+F src/sqliteInt.h 459e7dc3936c3f3321d588f9e74c1298526c29dced7e3b9c0b63de5a5e5ecdcc
 F src/sqliteLimit.h d7323ffea5208c6af2734574bae933ca8ed2ab728083caa117c9738581a31657
 F src/status.c 160c445d7d28c984a0eae38c144f6419311ed3eace59b44ac6dafc20db4af749
 F src/table.c 0f141b58a16de7e2fbe81c308379e7279f4c6b50eb08efeec5892794a0ba30d1
@@ -694,8 +694,8 @@ F src/vacuum.c 84ce7f01f8a7a08748e107a441db83bcec13970190ddcb0c9ff522adbc1c23fd
 F src/vdbe.c 47d3b78e75e239e1909933f0d77612b4111ebe760f01fdd0085e4e30b59b4cc6
 F src/vdbe.h 73b904a6b3bb27f308c6cc287a5751ebc7f1f89456be0ed068a12b92844c6e8c
 F src/vdbeInt.h a4147a4ddf613cb1bcb555ace9e9e74a9c099d65facd88155f191b1fb4d74cfb
-F src/vdbeapi.c 40c47b1528d308a322203de21d2e0d711753257ed9771771b6129214b1d65932
-F src/vdbeaux.c 3f9e3b6585e7434aa11300169dd66ddf0fc963a0c6f7940bdc058335dadeb353
+F src/vdbeapi.c 0760fbeea76491a4c5b79ff0ec212915e7fe27c60ba319ef232ec25403ef4493
+F src/vdbeaux.c 9f2a2ec80ff90266ab603065c32dd3c8b0a53023ab7210a03fccf324ad6ddbce
 F src/vdbeblob.c 5e61ce31aca17db8fb60395407457a8c1c7fb471dde405e0cd675974611dcfcd
 F src/vdbemem.c 87d3811aabb68eb9210c14c9a8b5e8ec3acb7ba787beb80a4323af54fb6013f7
 F src/vdbesort.c 43756031ca7430f7aec3ef904824a7883c4ede783e51f280d99b9b65c0796e35
@@ -2045,8 +2045,11 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P a95dbfae6133cc7aac950c3e7ba55a29d80b1625c39479a7d1d10b0868ee2be4
-R eadbc6d63430234ac2cb17610c353b99
-U dan
-Z b7b3585268bb0984169cdf414e4a24fd
+P 2abc3f9de0d2b66342598ab9015e62568ed20c7da4744a0f0a76b1db72c7e941
+R c0a88244db992b40f65ce347d314e978
+T *branch * txn-date
+T *sym-txn-date *
+T -sym-trunk *
+U drh
+Z 947981482da05fefcea564acb307123a
 # Remove this line to create a well-formed Fossil manifest.
diff --git a/manifest.uuid b/manifest.uuid
index 40eb42fb4..3cfde09ef 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-2abc3f9de0d2b66342598ab9015e62568ed20c7da4744a0f0a76b1db72c7e941
\ No newline at end of file
+5e4f45af96247e29910403a63ac148cb313b005f9c014b37a9a49d98f5fef9a6
\ No newline at end of file
diff --git a/src/date.c b/src/date.c
index a3e58bc4e..21077df93 100644
--- a/src/date.c
+++ b/src/date.c
@@ -331,11 +331,13 @@ static int parseYyyyMmDd(const char *zDate, DateTime *p){
 }
 
 /*
-** Set the time to the current time reported by the VFS.
+** Set the time to the current time reported for the prepared statement
+** that is currently executing.  The same time is reported for all
+** invocations of this routine from within the same call to sqlite3_step().
 **
 ** Return the number of errors.
 */
-static int setDateTimeToCurrent(sqlite3_context *context, DateTime *p){
+static int setCurrentStmtTime(sqlite3_context *context, DateTime *p){
   p->iJD = sqlite3StmtCurrentTime(context);
   if( p->iJD>0 ){
     p->validJD = 1;
@@ -346,6 +348,23 @@ static int setDateTimeToCurrent(sqlite3_context *context, DateTime *p){
 }
 
 /*
+** Set the time to the current time reported for the current transaction.
+** The same time is set for all calls to this routine within the same
+** transaction.
+**
+** Return the number of errors.
+*/
+static int setCurrentTxnTime(sqlite3_context *context, DateTime *p){
+  p->iJD = sqlite3TxnCurrentTime(context);
+  if( p->iJD>0 ){
+    p->validJD = 1;
+    return 0;
+  }else{
+    return 1;
+  }
+}
+
+/*
 ** Input "r" is a numeric quantity which might be a julian day number,
 ** or the number of seconds since 1970.  If the value if r is within
 ** range of a julian day number, install it as such and set validJD.
@@ -387,7 +406,9 @@ static int parseDateOrTime(
   }else if( parseHhMmSs(zDate, p)==0 ){
     return 0;
   }else if( sqlite3StrICmp(zDate,"now")==0 && sqlite3NotPureFunc(context) ){
-    return setDateTimeToCurrent(context, p);
+    return setCurrentStmtTime(context, p);
+  }else if( sqlite3StrICmp(zDate,"txn")==0 && sqlite3NotPureFunc(context) ){
+    return setCurrentTxnTime(context, p);
   }else if( sqlite3AtoF(zDate, &r, sqlite3Strlen30(zDate), SQLITE_UTF8)>0 ){
     setRawDateNumber(p, r);
     return 0;
@@ -946,7 +967,7 @@ static int isDate(
   memset(p, 0, sizeof(*p));
   if( argc==0 ){
     if( !sqlite3NotPureFunc(context) ) return 1;
-    return setDateTimeToCurrent(context, p);
+    return setCurrentStmtTime(context, p);
   }
   if( (eType = sqlite3_value_type(argv[0]))==SQLITE_FLOAT
                    || eType==SQLITE_INTEGER ){
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 3da5f13d5..638260c5d 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -1621,6 +1621,7 @@ struct sqlite3 {
   u8 nSqlExec;                  /* Number of pending OP_SqlExec opcodes */
   u8 eOpenState;                /* Current condition of the connection */
   int nextPagesize;             /* Pagesize after VACUUM if >0 */
+  i64 txnTime;                  /* Timestamp for current transaction */
   i64 nChange;                  /* Value returned by sqlite3_changes() */
   i64 nTotalChange;             /* Value returned by sqlite3_total_changes() */
   int aLimit[SQLITE_N_LIMIT];   /* Limits */
@@ -5341,6 +5342,7 @@ FuncDef *sqlite3VtabOverloadFunction(sqlite3 *,FuncDef*, int nArg, Expr*);
   void sqlite3VtabUsesAllSchemas(sqlite3_index_info*);
 #endif
 sqlite3_int64 sqlite3StmtCurrentTime(sqlite3_context*);
+sqlite3_int64 sqlite3TxnCurrentTime(sqlite3_context*);
 int sqlite3VdbeParameterIndex(Vdbe*, const char*, int);
 int sqlite3TransferBindings(sqlite3_stmt *, sqlite3_stmt *);
 void sqlite3ParseObjectInit(Parse*,sqlite3*);
diff --git a/src/vdbeapi.c b/src/vdbeapi.c
index 476b6a2ad..432c1fa22 100644
--- a/src/vdbeapi.c
+++ b/src/vdbeapi.c
@@ -988,6 +988,29 @@ sqlite3_int64 sqlite3StmtCurrentTime(sqlite3_context *p){
 }
 
 /*
+** Return the current time for a transaction.  If the current time
+** is requested more than once within the same transaction
+** the same time is returned for each invocation regardless
+** of the amount of time that elapses between invocations.  In other words,
+** the time returned is always the time of the first call.
+*/
+sqlite3_int64 sqlite3TxnCurrentTime(sqlite3_context *p){
+  int rc;
+#ifndef SQLITE_ENABLE_STAT4
+  sqlite3_int64 *piTime = &p->pVdbe->db->txnTime;
+  assert( p->pVdbe!=0 );
+#else
+  sqlite3_int64 iTime = 0;
+  sqlite3_int64 *piTime = p->pVdbe!=0 ? &p->pVdbe->db->txnTime : &iTime;
+#endif
+  if( *piTime==0 ){
+    rc = sqlite3OsCurrentTimeInt64(p->pOut->db->pVfs, piTime);
+    if( rc ) *piTime = 0;
+  }
+  return *piTime;
+}
+
+/*
 ** Create a new aggregate context for p and return a pointer to
 ** its pMem->z element.
 */
diff --git a/src/vdbeaux.c b/src/vdbeaux.c
index d04d8f1e1..82dc60715 100644
--- a/src/vdbeaux.c
+++ b/src/vdbeaux.c
@@ -3394,6 +3394,7 @@ int sqlite3VdbeHalt(Vdbe *p){
   */
   if( db->autoCommit ){
     sqlite3ConnectionUnlocked(db);
+    db->txnTime = 0;
   }
 
   assert( db->nVdbeActive>0 || db->autoCommit==0 || db->nStatement==0 );