Add the ability to enable and disable foreign key constraints and triggers

using calls to sqlite3_db_config().

FossilOrigin-Name: 09e167f9c14625924b17bbb1f292f89ac9ddc93a

manifest

@@ -1,8 +1,8 @@
 -----BEGIN PGP SIGNED MESSAGE-----
 Hash: SHA1
 
-C Add\sa\stest\scase\sto\sverify\sthat\sticket\s[f7b4edece25c994857]\sis\sfixed.
-D 2011-03-19T02:04:02.294
+C Add\sthe\sability\sto\senable\sand\sdisable\sforeign\skey\sconstraints\sand\striggers\nusing\scalls\sto\ssqlite3_db_config().
+D 2011-03-21T17:15:58.841
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in 27701a1653595a1f2187dc61c8117e00a6c1d50f
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -102,7 +102,7 @@ F ext/rtree/rtree_util.tcl 06aab2ed5b826545bf215fff90ecb9255a8647ea
 F ext/rtree/sqlite3rtree.h 1af0899c63a688e272d69d8e746f24e76f10a3f0
 F ext/rtree/tkt3363.test 142ab96eded44a3615ec79fba98c7bde7d0f96de
 F ext/rtree/viewrtree.tcl eea6224b3553599ae665b239bd827e182b466024
-F install-sh 9d4de14ab9fb0facae2f48780b874848cbf2f895 x
+F install-sh 9d4de14ab9fb0facae2f48780b874848cbf2f895
 F ltmain.sh 3ff0879076df340d2e23ae905484d8c15d5fdea8
 F main.mk 54190fab7cdba523e311c274c95ea480f32abfb5
 F mkdll.sh 7d09b23c05d56532e9d44a50868eb4b12ff4f74a
@@ -146,7 +146,7 @@ F src/journal.c 552839e54d1bf76fb8f7abe51868b66acacf6a0e
 F src/legacy.c a199d7683d60cef73089e892409113e69c23a99f
 F src/lempar.c 7f026423f4d71d989e719a743f98a1cbd4e6d99e
 F src/loadext.c 8af9fcc75708d60b88636ccba38b4a7b3c155c3e
-F src/main.c b43dc11c8335ceb759d48358ddafe09f02b18a1d
+F src/main.c 6d10370bfc2235b7d6cf78510b20c94c00123357
 F src/malloc.c 92d59a007d7a42857d4e9454aa25b6b703286be1
 F src/mem0.c 6a55ebe57c46ca1a7d98da93aaa07f99f1059645
 F src/mem1.c 00bd8265c81abb665c48fea1e0c234eb3b922206
@@ -181,9 +181,9 @@ F src/resolve.c 1c0f32b64f8e3f555fe1f732f9d6f501a7f05706
 F src/rowset.c 69afa95a97c524ba6faf3805e717b5b7ae85a697
 F src/select.c d24406c45dd2442eb2eeaac413439066b149c944
 F src/shell.c 4a5e0ad845475c84881f0b25b1abba2ddaab0a72
-F src/sqlite.h.in 369c767e6b9f101d63d8e4c5e40279f975ccec08
+F src/sqlite.h.in 9d85096265a53db6c9d452eb478d5ced15308275
 F src/sqlite3ext.h c90bd5507099f62043832d73f6425d8d5c5da754
-F src/sqliteInt.h 223159f987959f7ed55ebe5b5d175842ebb7647f
+F src/sqliteInt.h 1de0edab31cc9e5c2f3540e08e8b97926f84bfeb
 F src/sqliteLimit.h a17dcd3fb775d63b64a43a55c54cb282f9726f44
 F src/status.c 4997380fbb915426fef9e500b4872e79c99267fc
 F src/table.c 2cd62736f845d82200acfa1287e33feb3c15d62e
@@ -229,7 +229,7 @@ F src/test_vfs.c 2ed8853c1e51ac6f9ea091f7ce4e0d618bba8b86
 F src/test_vfstrace.c f5c3b3b893d81a580d0f577e6d9bcfc1fd496136
 F src/test_wsd.c 41cadfd9d97fe8e3e4e44f61a4a8ccd6f7ca8fe9
 F src/tokenize.c 604607d6813e9551cf5189d899e0a25c12681080
-F src/trigger.c 95d2ff4b2996fabe886c9764b5978980e29f4afa
+F src/trigger.c ec4813709e990a169b6923293e839fa5dfd64282
 F src/update.c 81911be16ece3c3e7716aa18565b4814ec41f8b9
 F src/utf.c 1baeeac91707a4df97ccc6141ec0f808278af685
 F src/util.c cd997077bad039efc0597eb027c929658f93c018
@@ -605,7 +605,7 @@ F test/permutations.test 5b2a4cb756ffb2407cb4743163668d1d769febb6
 F test/pragma.test fdfc09067ea104a0c247a1a79d8093b56656f850
 F test/pragma2.test 5364893491b9231dd170e3459bfc2e2342658b47
 F test/printf.test 05970cde31b1a9f54bd75af60597be75a5c54fea
-F test/progress.test 5b075c3c790c7b2a61419bc199db87aaf48b8301
+F test/progress.test 5b075c3c790c7b2a61419bc199db87aaf48b8301 x
 F test/ptrchng.test ef1aa72d6cf35a2bbd0869a649b744e9d84977fc
 F test/quick.test 1681febc928d686362d50057c642f77a02c62e57
 F test/quota.test ddafe133653093eb9a99ccd6264884ae43f9c9b8
@@ -893,7 +893,7 @@ F tool/genfkey.test 4196a8928b78f51d54ef58e99e99401ab2f0a7e5
 F tool/lemon.c dfd81a51b6e27e469ba21d01a75ddf092d429027
 F tool/lempar.c 01ca97f87610d1dac6d8cd96ab109ab1130e76dc
 F tool/mkkeywordhash.c d2e6b4a5965e23afb80fbe74bb54648cd371f309
-F tool/mkopts.tcl 66ac10d240cc6e86abd37dc908d50382f84ff46e
+F tool/mkopts.tcl 66ac10d240cc6e86abd37dc908d50382f84ff46e x
 F tool/mkspeedsql.tcl a1a334d288f7adfe6e996f2e712becf076745c97
 F tool/mksqlite3c.tcl cf44512a48112b1ba09590548660a5a6877afdb3
 F tool/mksqlite3h.tcl d76c226a5e8e1f3b5f6593bcabe5e98b3b1ec9ff
@@ -918,14 +918,14 @@ F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
 F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
 F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
 F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
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+P eedbcf0a0ba91bb8b9cd3d115081ba297e9959fe
+R 280ad38169dd48b2d9e175160372c567
 U drh
-Z 179ccdf4b38b983395c742d9461b85ad
+Z e8e199200b835ba249870038ad2cd6dc
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manifest.uuid

@@ -1 +1 @@
-eedbcf0a0ba91bb8b9cd3d115081ba297e9959fe
+09e167f9c14625924b17bbb1f292f89ac9ddc93a

src/main.c

@@ -522,7 +522,35 @@ int sqlite3_db_config(sqlite3 *db, int op, ...){
       break;
     }
     default: {
+      static const struct {
+        int op;      /* The opcode */
+        u32 mask;    /* Mask of the bit in sqlite3.flags to set/clear */
+      } aFlagOp[] = {
+        { SQLITE_DBCONFIG_ENABLE_FKEY,    SQLITE_ForeignKeys    },
+        { SQLITE_DBCONFIG_ENABLE_TRIGGER, SQLITE_EnableTrigger  },
+      };
+      int i;
       rc = SQLITE_ERROR; /* IMP: R-42790-23372 */
+      for(i=0; i<ArraySize(aFlagOp); i++){
+        if( aFlagOp[i].op==op ){
+          int onoff = va_arg(ap, int);
+          int *pRes = va_arg(ap, int*);
+          u32 oldFlags = db->flags;
+          if( onoff>0 ){
+            db->flags |= aFlagOp[i].mask;
+          }else if( onoff==0 ){
+            db->flags &= ~aFlagOp[i].mask;
+          }
+          if( oldFlags!=db->flags ){
+            sqlite3ExpirePreparedStatements(db);
+          }
+          if( pRes ){
+            *pRes = (db->flags & aFlagOp[i].mask)!=0;
+          }
+          rc = SQLITE_OK;
+          break;
+        }
+      }
       break;
     }
   }
@@ -1855,7 +1883,7 @@ static int openDatabase(
   db->autoCommit = 1;
   db->nextAutovac = -1;
   db->nextPagesize = 0;
-  db->flags |= SQLITE_ShortColNames | SQLITE_AutoIndex
+  db->flags |= SQLITE_ShortColNames | SQLITE_AutoIndex | SQLITE_EnableTrigger
 #if SQLITE_DEFAULT_FILE_FORMAT<4
                  | SQLITE_LegacyFileFmt
 #endif

src/sqlite.h.in

@@ -1125,17 +1125,12 @@ int sqlite3_config(int, ...);
 ** The sqlite3_db_config() interface is used to make configuration
 ** changes to a [database connection].  The interface is similar to
 ** [sqlite3_config()] except that the changes apply to a single
-** [database connection] (specified in the first argument).  The
-** sqlite3_db_config() interface should only be used immediately after
-** the database connection is created using [sqlite3_open()],
-** [sqlite3_open16()], or [sqlite3_open_v2()].  
+** [database connection] (specified in the first argument).
 **
 ** The second argument to sqlite3_db_config(D,V,...)  is the
-** configuration verb - an integer code that indicates what
-** aspect of the [database connection] is being configured.
-** The only choice for this value is [SQLITE_DBCONFIG_LOOKASIDE].
-** New verbs are likely to be added in future releases of SQLite.
-** Additional arguments depend on the verb.
+** [SQLITE_DBCONIG_LOOKASIDE | configuration verb] - an integer code 
+** that indicates what aspect of the [database connection] is being configured.
+** Subsequent arguments vary depending on the configuration verb.
 **
 ** ^Calls to sqlite3_db_config() return SQLITE_OK if and only if
 ** the call is considered successful.
@@ -1483,9 +1478,31 @@ struct sqlite3_mem_methods {
 ** memory is in use leaves the configuration unchanged and returns 
 ** [SQLITE_BUSY].)^</dd>
 **
+** <dt>SQLITE_DBCONFIG_ENABLE_FKEY</dt>
+** <dd> ^This option is used to enable or disable the enforcement of
+** [foreign key constraints].  There should be two additional arguments.
+** The first argument is an integer which is 0 to disable FK enforcement,
+** positive to enable FK enforcement or negative to leave FK enforcement
+** unchanged.  The second parameter is a pointer to an integer into which
+** is written 0 or 1 to indicate whether FK enforcement is off or on
+** following this call.  The second parameter may be a NULL pointer, in
+** which case the FK enforcement setting is not reported back. </dd>
+**
+** <dt>SQLITE_DBCONFIG_ENABLE_TRIGGER</dt>
+** <dd> ^This option is used to enable or disable [CREATE TRIGGER | triggers].
+** There should be two additional arguments.
+** The first argument is an integer which is 0 to disable triggers,
+** positive to enable trigers or negative to leave the setting unchanged.
+** The second parameter is a pointer to an integer into which
+** is written 0 or 1 to indicate whether triggers are disabled or enabled
+** following this call.  The second parameter may be a NULL pointer, in
+** which case the trigger setting is not reported back. </dd>
+**
 ** </dl>
 */
-#define SQLITE_DBCONFIG_LOOKASIDE    1001  /* void* int int */
+#define SQLITE_DBCONFIG_LOOKASIDE       1001  /* void* int int */
+#define SQLITE_DBCONFIG_ENABLE_FKEY     1002  /* int int* */
+#define SQLITE_DBCONFIG_ENABLE_TRIGGER  1003  /* int int* */
 
 
 /*

src/sqliteInt.h

@@ -925,6 +925,7 @@ struct sqlite3 {
 #define SQLITE_AutoIndex      0x08000000  /* Enable automatic indexes */
 #define SQLITE_PreferBuiltin  0x10000000  /* Preference to built-in funcs */
 #define SQLITE_LoadExtension  0x20000000  /* Enable load_extension */
+#define SQLITE_EnableTrigger  0x40000000  /* True to enable triggers */
 
 /*
 ** Bits of the sqlite3.flags field that are used by the

src/trigger.c

@@ -623,8 +623,12 @@ Trigger *sqlite3TriggersExist(
   int *pMask              /* OUT: Mask of TRIGGER_BEFORE|TRIGGER_AFTER */
 ){
   int mask = 0;
-  Trigger *pList = sqlite3TriggerList(pParse, pTab);
+  Trigger *pList = 0;
   Trigger *p;
+
+  if( (pParse->db->flags & SQLITE_EnableTrigger)!=0 ){
+    pList = sqlite3TriggerList(pParse, pTab);
+  }
   assert( pList==0 || IsVirtual(pTab)==0 );
   for(p=pList; p; p=p->pNext){
     if( p->op==op && checkColumnOverlap(p->pColumns, pChanges) ){