Omit all sqlite3_trace() output from the triggers associated with

foreign key constraints.

FossilOrigin-Name: fda08e3d10cc850664a356efdafcfc68187053849e1b00991b0b35d892a6776b

manifest

@@ -1,5 +1,5 @@
-C Show\sthe\stext\sof\sindividual\sstatements\swithin\sa\strigger,\sas\sthey\nexecute,\sas\scomments\sin\sthe\soutput\sfrom\ssqlite3_trace()\sand\ssqlite3_trace_v2().
-D 2017-12-27T20:38:35.013
+C Omit\sall\ssqlite3_trace()\soutput\sfrom\sthe\striggers\sassociated\swith\nforeign\skey\sconstraints.
+D 2017-12-27T21:30:34.358
 F Makefile.in ceb40bfcb30ebba8e1202b34c56ff7e13e112f9809e2381d99be32c2726058f5
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc 6480671f7c129e61208d69492b3c71ce4310d49fceac83cfb17f1c081e242b69
@@ -542,7 +542,7 @@ F src/test_wsd.c 41cadfd9d97fe8e3e4e44f61a4a8ccd6f7ca8fe9
 F src/threads.c 4ae07fa022a3dc7c5beb373cf744a85d3c5c6c3c
 F src/tokenize.c 1003d6d90c6783206c711f0a9397656fa5b055209f4d092caa43bb3bf5215db5
 F src/treeview.c eae35972ff44f67064de2eaf35f04afe94e7aea3271a8b3bcebb3f954880fec3
-F src/trigger.c 5fa038ae62adae53b62776bacc34dc56191385eedac79d49264389620ddc2526
+F src/trigger.c a34539c69433276d37b0da9a89c117726ff2d292c0902895af1f393a983cd3a1
 F src/update.c 961bd1265d4d1e5cd65c9a54fa5122fb7aefcb003fcf2de0c092fceb7e58972c
 F src/utf.c 810fbfebe12359f10bc2a011520a6e10879ab2a163bcb26c74768eab82ea62a5
 F src/util.c 7315e97a8dc2c8e19ca64196c652cf0a65d13fd0a211b2cec082062372dc6261
@@ -788,7 +788,7 @@ F test/extraquick.test cb254400bd42bfb777ff675356aabf3287978f79
 F test/fallocate.test 87b5e43c872b7e69cd80b7b8813eb102b571a75d45dda24e38b65537bcc85733
 F test/filectrl.test 6e871c2d35dead1d9a88e176e8d2ca094fec6bb3
 F test/filefmt.test f393e80c4b8d493b7a7f8f3809a8425bbf4292af1f5140f01cb1427798a2bbd4
-F test/fkey1.test ba64806ff9a04eecab2679caad377ae99a5e94e4
+F test/fkey1.test 9d7e3a0d409e7f64ab077af3b4fc5e5ce1a4e8d8f1272b65b9d93480aeb1fa2b
 F test/fkey2.test 155809016fad6b2a1491facf2ac53a551bc57c2c
 F test/fkey3.test 76d475c80b84ee7a5d062e56ccb6ea68882e2b49
 F test/fkey4.test 86446017011273aad8f9a99c1a65019e7bd9ca9d
@@ -1687,7 +1687,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P a8e1545cb7aacb6a26a8c92a3ad4a3d584d150c3a00d2828c8adbb1ee19fcb6d
-R 0ae5195579783355d0e4696ba0c5bdad
+P fe3d2b97d8945e6a9636472f77bcdc92cc5dda8b3e6e3a4fcbdd0a212ea5b9aa
+R 22de62f1b2836f49ea0af57f6725c723
 U drh
-Z 4ebaaf3c94dd44dc4a2d0b266bee40f3
+Z 3aa637606646f6f00ff3a9a21b2a3987

manifest.uuid

@@ -1 +1 @@
-fe3d2b97d8945e6a9636472f77bcdc92cc5dda8b3e6e3a4fcbdd0a212ea5b9aa
+fda08e3d10cc850664a356efdafcfc68187053849e1b00991b0b35d892a6776b

src/trigger.c

@@ -733,9 +733,11 @@ static int codeTriggerProgram(
     assert( pParse->okConstFactor==0 );
 
 #ifndef SQLITE_OMIT_TRACE
-    sqlite3VdbeAddOp4(v, OP_Trace, 0x7fffffff, 1, 0,
-                      sqlite3MPrintf(db, "-- %s", pStep->zSpan),
-                      P4_DYNAMIC);
+    if( pStep->zSpan ){
+      sqlite3VdbeAddOp4(v, OP_Trace, 0x7fffffff, 1, 0,
+                        sqlite3MPrintf(db, "-- %s", pStep->zSpan),
+                        P4_DYNAMIC);
+    }
 #endif
 
     switch( pStep->op ){
@@ -878,9 +880,11 @@ static TriggerPrg *codeRowTrigger(
       pTab->zName
     ));
 #ifndef SQLITE_OMIT_TRACE
-    sqlite3VdbeChangeP4(v, -1, 
-      sqlite3MPrintf(db, "-- TRIGGER %s", pTrigger->zName), P4_DYNAMIC
-    );
+    if( pTrigger->zName ){
+      sqlite3VdbeChangeP4(v, -1, 
+        sqlite3MPrintf(db, "-- TRIGGER %s", pTrigger->zName), P4_DYNAMIC
+      );
+    }
 #endif
 
     /* If one was specified, code the WHEN clause. If it evaluates to false

test/fkey1.test

@@ -171,6 +171,20 @@ do_catchsql_test fkey1-5.2 {
   INSERT OR REPLACE INTO t11 VALUES (2, 3);
 } {1 {FOREIGN KEY constraint failed}}
 
+# Make sure sqlite3_trace() output works with triggers used to implement
+# FK constraints
+#
+proc sqltrace {txt} {
+  global traceoutput
+  lappend traceoutput $txt
+}
+do_test fkey1-5.2.1 {
+  unset -nocomplain traceoutput
+  db trace sqltrace
+  catch {db eval {INSERT OR REPLACE INTO t11 VALUES(2,3);}}
+  set traceoutput
+} {{INSERT OR REPLACE INTO t11 VALUES(2,3);} {INSERT OR REPLACE INTO t11 VALUES(2,3);} {INSERT OR REPLACE INTO t11 VALUES(2,3);}}
+
 # A similar test to the above.
 do_execsql_test fkey1-5.3 {
   CREATE TABLE Foo (