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SQLite training in Houston TX on 2019-11-05 (details)
Part of the 2019 Tcl Conference

Artifact c7fbc3eb241b5a7ba4b0815f76c3708483e91890f9573add12a610c45b2a6022:


# 2009 August 24
#
# The author disclaims copyright to this source code.  In place of
# a legal notice', here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix triggerC
ifcapable {!trigger} {
  finish_test
  return
}

#-------------------------------------------------------------------------
# Test organization:
#
# triggerC-1.*: Haphazardly designed trigger related tests that were useful
#               during an upgrade of the triggers sub-system.
# 
# triggerC-2.*:
#
# triggerC-3.*:
#
# triggerC-4.*:
#
# triggerC-5.*: Test that when recursive triggers are enabled DELETE 
#               triggers are fired when rows are deleted as part of OR
#               REPLACE conflict resolution. And that they are not fired
#               if recursive triggers are not enabled.
#
# triggerC-6.*: Test that the recursive_triggers pragma returns correct
#               results when invoked without an argument.
#

# Enable recursive triggers for this file.
#
execsql { PRAGMA recursive_triggers = on }

#sqlite3_db_config_lookaside db 0 0 0

#-------------------------------------------------------------------------
# This block of tests, triggerC-1.*, are not aimed at any specific
# property of the triggers sub-system. They were created to debug
# specific problems while modifying SQLite to support recursive
# triggers. They are left here in case they can help debug the
# same problems again.
#
do_test triggerC-1.1 {
  execsql {
    CREATE TABLE t1(a, b, c);
    CREATE TABLE log(t, a1, b1, c1, a2, b2, c2);
    CREATE TRIGGER trig1 BEFORE INSERT ON t1 BEGIN
      INSERT INTO log VALUES('before', NULL, NULL, NULL, new.a, new.b, new.c);
    END;
    CREATE TRIGGER trig2 AFTER INSERT ON t1 BEGIN
      INSERT INTO log VALUES('after', NULL, NULL, NULL, new.a, new.b, new.c);
    END;
    CREATE TRIGGER trig3 BEFORE UPDATE ON t1 BEGIN
      INSERT INTO log VALUES('before', old.a,old.b,old.c, new.a,new.b,new.c);
    END;
    CREATE TRIGGER trig4 AFTER UPDATE ON t1 BEGIN
      INSERT INTO log VALUES('after', old.a,old.b,old.c, new.a,new.b,new.c);
    END;

    CREATE TRIGGER trig5 BEFORE DELETE ON t1 BEGIN
      INSERT INTO log VALUES('before', old.a,old.b,old.c, NULL,NULL,NULL);
    END;
    CREATE TRIGGER trig6 AFTER DELETE ON t1 BEGIN
      INSERT INTO log VALUES('after', old.a,old.b,old.c, NULL,NULL,NULL);
    END;
  }
} {}
do_test triggerC-1.2 {
  execsql {
    INSERT INTO t1 VALUES('A', 'B', 'C');
    SELECT * FROM log;
  }
} {before {} {} {} A B C after {} {} {} A B C}
do_test triggerC-1.3 {
  execsql { SELECT * FROM t1 }
} {A B C}
do_test triggerC-1.4 {
  execsql {
    DELETE FROM log;
    UPDATE t1 SET a = 'a';
    SELECT * FROM log;
  }
} {before A B C a B C after A B C a B C}
do_test triggerC-1.5 {
  execsql { SELECT * FROM t1 }
} {a B C}
do_test triggerC-1.6 {
  execsql {
    DELETE FROM log;
    DELETE FROM t1;
    SELECT * FROM log;
  }
} {before a B C {} {} {} after a B C {} {} {}}
do_test triggerC-1.7 {
  execsql { SELECT * FROM t1 }
} {}
do_test triggerC-1.8 {
  execsql {
    CREATE TABLE t4(a, b);
    CREATE TRIGGER t4t AFTER DELETE ON t4 BEGIN
      SELECT RAISE(ABORT, 'delete is not supported');
    END;
  }
} {}
do_test triggerC-1.9 {
  execsql { INSERT INTO t4 VALUES(1, 2) }
  catchsql { DELETE FROM t4 }
} {1 {delete is not supported}}
do_test triggerC-1.10 {
  execsql { SELECT * FROM t4 }
} {1 2}
do_test triggerC-1.11 {
  execsql {
    CREATE TABLE t5 (a primary key, b, c);
    INSERT INTO t5 values (1, 2, 3);
    CREATE TRIGGER au_tbl AFTER UPDATE ON t5 BEGIN
      UPDATE OR IGNORE t5 SET a = new.a, c = 10;
    END;
  }
} {}
do_test triggerC-1.12 {
  catchsql { UPDATE OR REPLACE t5 SET a = 4 WHERE a = 1 }
} {1 {too many levels of trigger recursion}}
do_test triggerC-1.13 {
  execsql {
    CREATE TABLE t6(a INTEGER PRIMARY KEY, b);
    INSERT INTO t6 VALUES(1, 2);
    create trigger r1 after update on t6 for each row begin
      SELECT 1;
    end;
    UPDATE t6 SET a=a; 
  }
} {}
do_test triggerC-1.14 {
  execsql {
    DROP TABLE t1;
    CREATE TABLE cnt(n);
    INSERT INTO cnt VALUES(0);
    CREATE TABLE t1(a INTEGER PRIMARY KEY, b UNIQUE, c, d, e);
    CREATE INDEX t1cd ON t1(c,d);
    CREATE TRIGGER t1r1 AFTER UPDATE ON t1 BEGIN UPDATE cnt SET n=n+1; END;
    INSERT INTO t1 VALUES(1,2,3,4,5);
    INSERT INTO t1 VALUES(6,7,8,9,10);
    INSERT INTO t1 VALUES(11,12,13,14,15);
  }
} {}
do_test triggerC-1.15 {
  catchsql { UPDATE OR ROLLBACK t1 SET a=100 }
} {1 {UNIQUE constraint failed: t1.a}}


#-------------------------------------------------------------------------
# This block of tests, triggerC-2.*, tests that recursive trigger
# programs (triggers that fire themselves) work. More specifically,
# this block focuses on recursive INSERT triggers.
#
do_test triggerC-2.1.0 {
  execsql {
    CREATE TABLE t2(a PRIMARY KEY);
  }
} {}

foreach {n tdefn rc} {
  1 { 
    CREATE TRIGGER t2_trig AFTER INSERT ON t2 WHEN (new.a>0) BEGIN
      INSERT INTO t2 VALUES(new.a - 1);
    END; 
  } {0 {10 9 8 7 6 5 4 3 2 1 0}}

  2 {
    CREATE TRIGGER t2_trig AFTER INSERT ON t2 BEGIN
      SELECT CASE WHEN new.a==2 THEN RAISE(IGNORE) ELSE NULL END;
      INSERT INTO t2 VALUES(new.a - 1);
    END;
  } {0 {10 9 8 7 6 5 4 3 2}}

  3 { 
    CREATE TRIGGER t2_trig BEFORE INSERT ON t2 WHEN (new.a>0) BEGIN
      INSERT INTO t2 VALUES(new.a - 1);
    END; 
  } {0 {0 1 2 3 4 5 6 7 8 9 10}}

  4 { 
    CREATE TRIGGER t2_trig BEFORE INSERT ON t2 BEGIN
      SELECT CASE WHEN new.a==2 THEN RAISE(IGNORE) ELSE NULL END;
      INSERT INTO t2 VALUES(new.a - 1);
    END;
  } {0 {3 4 5 6 7 8 9 10}}

  5 { 
    CREATE TRIGGER t2_trig BEFORE INSERT ON t2 BEGIN
      INSERT INTO t2 VALUES(new.a - 1);
    END;
  } {1 {too many levels of trigger recursion}}

  6 { 
    CREATE TRIGGER t2_trig AFTER INSERT ON t2 WHEN (new.a>0) BEGIN
      INSERT OR IGNORE INTO t2 VALUES(new.a);
    END;
  } {0 10}

  7 { 
    CREATE TRIGGER t2_trig BEFORE INSERT ON t2 WHEN (new.a>0) BEGIN
      INSERT OR IGNORE INTO t2 VALUES(new.a);
    END;
  } {1 {too many levels of trigger recursion}}
} {
  do_test triggerC-2.1.$n {
    catchsql { DROP TRIGGER t2_trig }
    execsql  { DELETE FROM t2 }
    execsql  $tdefn
    catchsql {
      INSERT INTO t2 VALUES(10);
      SELECT * FROM t2 ORDER BY rowid;
    }
  } $rc
}

do_test triggerC-2.2 {
  execsql "
    CREATE TABLE t22(x);

    CREATE TRIGGER t22a AFTER INSERT ON t22 BEGIN
      INSERT INTO t22 SELECT x + (SELECT max(x) FROM t22) FROM t22;
    END;
    CREATE TRIGGER t22b BEFORE INSERT ON t22 BEGIN
      SELECT CASE WHEN (SELECT count(*) FROM t22) >= [expr $SQLITE_MAX_TRIGGER_DEPTH / 2]
                  THEN RAISE(IGNORE)
                  ELSE NULL END;
    END;

    INSERT INTO t22 VALUES(1);
    SELECT count(*) FROM t22;
  "
} [list [expr $SQLITE_MAX_TRIGGER_DEPTH / 2]]

do_test triggerC-2.3 {
  execsql "
    CREATE TABLE t23(x PRIMARY KEY);

    CREATE TRIGGER t23a AFTER INSERT ON t23 BEGIN
      INSERT INTO t23 VALUES(new.x + 1);
    END;

    CREATE TRIGGER t23b BEFORE INSERT ON t23 BEGIN
      SELECT CASE WHEN new.x>[expr $SQLITE_MAX_TRIGGER_DEPTH / 2]
                  THEN RAISE(IGNORE)
                  ELSE NULL END;
    END;

    INSERT INTO t23 VALUES(1);
    SELECT count(*) FROM t23;
  "
} [list [expr $SQLITE_MAX_TRIGGER_DEPTH / 2]]
 

#-----------------------------------------------------------------------
# This block of tests, triggerC-3.*, test that SQLite throws an exception
# when it detects excessive recursion.
#
do_test triggerC-3.1.1 {
  execsql {
    CREATE TABLE t3(a, b);
    CREATE TRIGGER t3i AFTER INSERT ON t3 BEGIN
      DELETE FROM t3 WHERE rowid = new.rowid;
    END;
    CREATE TRIGGER t3d AFTER DELETE ON t3 BEGIN
      INSERT INTO t3 VALUES(old.a, old.b);
    END;
  }
} {}
do_test triggerC-3.1.2 {
  catchsql { INSERT INTO t3 VALUES(0,0) }
} {1 {too many levels of trigger recursion}}
do_test triggerC-3.1.3 {
  execsql { SELECT * FROM t3 }
} {}

do_test triggerC-3.2.1 {
  execsql "
    CREATE TABLE t3b(x);
    CREATE TRIGGER t3bi AFTER INSERT ON t3b WHEN new.x<[expr $SQLITE_MAX_TRIGGER_DEPTH * 2] BEGIN
      INSERT INTO t3b VALUES(new.x+1);
    END;
  "
  catchsql {
    INSERT INTO t3b VALUES(1);
  }
} {1 {too many levels of trigger recursion}}
do_test triggerC-3.2.2 {
  db eval {SELECT * FROM t3b}
} {}

do_test triggerC-3.3.1 {
  catchsql "
    INSERT INTO t3b VALUES([expr $SQLITE_MAX_TRIGGER_DEPTH + 1]);
  "
} {0 {}}
do_test triggerC-3.3.2 {
  db eval {SELECT count(*), max(x), min(x) FROM t3b}
} [list $SQLITE_MAX_TRIGGER_DEPTH [expr $SQLITE_MAX_TRIGGER_DEPTH * 2] [expr $SQLITE_MAX_TRIGGER_DEPTH + 1]]

do_test triggerC-3.4.1 {
  catchsql "
    DELETE FROM t3b;
    INSERT INTO t3b VALUES([expr $SQLITE_MAX_TRIGGER_DEPTH - 1]);
  "
} {1 {too many levels of trigger recursion}}
do_test triggerC-3.4.2 {
  db eval {SELECT count(*), max(x), min(x) FROM t3b}
} {0 {} {}}

do_test triggerC-3.5.1 {
  sqlite3_limit db SQLITE_LIMIT_TRIGGER_DEPTH  [expr $SQLITE_MAX_TRIGGER_DEPTH / 10]
  catchsql "
    INSERT INTO t3b VALUES([expr ($SQLITE_MAX_TRIGGER_DEPTH * 2) - ($SQLITE_MAX_TRIGGER_DEPTH / 10) + 1]);
  "
} {0 {}}
do_test triggerC-3.5.2 {
  db eval {SELECT count(*), max(x), min(x) FROM t3b}
} [list [expr $SQLITE_MAX_TRIGGER_DEPTH / 10] [expr $SQLITE_MAX_TRIGGER_DEPTH * 2] [expr ($SQLITE_MAX_TRIGGER_DEPTH * 2) - ($SQLITE_MAX_TRIGGER_DEPTH / 10) + 1]]

do_test triggerC-3.5.3 {
  catchsql "
    DELETE FROM t3b;
    INSERT INTO t3b VALUES([expr ($SQLITE_MAX_TRIGGER_DEPTH * 2) - ($SQLITE_MAX_TRIGGER_DEPTH / 10)]);
  "
} {1 {too many levels of trigger recursion}}
do_test triggerC-3.5.4 {
  db eval {SELECT count(*), max(x), min(x) FROM t3b}
} {0 {} {}}

do_test triggerC-3.6.1 {
  sqlite3_limit db SQLITE_LIMIT_TRIGGER_DEPTH 1
  catchsql "
    INSERT INTO t3b VALUES([expr $SQLITE_MAX_TRIGGER_DEPTH * 2]);
  "
} {0 {}}
do_test triggerC-3.6.2 {
  db eval {SELECT count(*), max(x), min(x) FROM t3b}
} [list 1 [expr $SQLITE_MAX_TRIGGER_DEPTH * 2] [expr $SQLITE_MAX_TRIGGER_DEPTH * 2]]

do_test triggerC-3.6.3 {
  catchsql "
    DELETE FROM t3b;
    INSERT INTO t3b VALUES([expr ($SQLITE_MAX_TRIGGER_DEPTH * 2) - 1]);
  "
} {1 {too many levels of trigger recursion}}
do_test triggerC-3.6.4 {
  db eval {SELECT count(*), max(x), min(x) FROM t3b}
} {0 {} {}}
sqlite3_limit db SQLITE_LIMIT_TRIGGER_DEPTH $SQLITE_MAX_TRIGGER_DEPTH


#-----------------------------------------------------------------------
# This next block of tests, triggerC-4.*, checks that affinity 
# transformations and constraint processing is performed at the correct 
# times relative to BEFORE and AFTER triggers.
#
# For an INSERT statement, for each row to be inserted:
#
#   1. Apply affinities to non-rowid values to be inserted.
#   2. Fire BEFORE triggers.
#   3. Process constraints.
#   4. Insert new record.
#   5. Fire AFTER triggers.
#
# If the value of the rowid field is to be automatically assigned, it is
# set to -1 in the new.* record. Even if it is explicitly set to NULL
# by the INSERT statement.
#
# For an UPDATE statement, for each row to be deleted:
#
#   1. Apply affinities to non-rowid values to be inserted.
#   2. Fire BEFORE triggers.
#   3. Process constraints.
#   4. Insert new record.
#   5. Fire AFTER triggers.
#
# For a DELETE statement, for each row to be deleted:
#
#   1. Fire BEFORE triggers.
#   2. Remove database record.
#   3. Fire AFTER triggers.
#
# When a numeric value that as an exact integer representation is stored
# in a column with REAL affinity, it is actually stored as an integer.
# These tests check that the typeof() such values is always 'real',
# not 'integer'.
#
# triggerC-4.1.*: Check that affinity transformations are made before
#                 triggers are invoked.
#
do_test triggerC-4.1.1 {
  catchsql { DROP TABLE log }
  catchsql { DROP TABLE t4 }
  execsql {
    CREATE TABLE log(t);
    CREATE TABLE t4(a TEXT,b INTEGER,c REAL);
    CREATE TRIGGER t4bi BEFORE INSERT ON t4 BEGIN
      INSERT INTO log VALUES(new.rowid || ' ' || typeof(new.rowid) || ' ' ||
                             new.a     || ' ' || typeof(new.a)     || ' ' ||
                             new.b     || ' ' || typeof(new.b)     || ' ' ||
                             new.c     || ' ' || typeof(new.c)
      );
    END;
    CREATE TRIGGER t4ai AFTER INSERT ON t4 BEGIN
      INSERT INTO log VALUES(new.rowid || ' ' || typeof(new.rowid) || ' ' ||
                             new.a     || ' ' || typeof(new.a)     || ' ' ||
                             new.b     || ' ' || typeof(new.b)     || ' ' ||
                             new.c     || ' ' || typeof(new.c)
      );
    END;
    CREATE TRIGGER t4bd BEFORE DELETE ON t4 BEGIN
      INSERT INTO log VALUES(old.rowid || ' ' || typeof(old.rowid) || ' ' ||
                             old.a     || ' ' || typeof(old.a)     || ' ' ||
                             old.b     || ' ' || typeof(old.b)     || ' ' ||
                             old.c     || ' ' || typeof(old.c)
      );
    END;
    CREATE TRIGGER t4ad AFTER DELETE ON t4 BEGIN
      INSERT INTO log VALUES(old.rowid || ' ' || typeof(old.rowid) || ' ' ||
                             old.a     || ' ' || typeof(old.a)     || ' ' ||
                             old.b     || ' ' || typeof(old.b)     || ' ' ||
                             old.c     || ' ' || typeof(old.c)
      );
    END;
    CREATE TRIGGER t4bu BEFORE UPDATE ON t4 BEGIN
      INSERT INTO log VALUES(old.rowid || ' ' || typeof(old.rowid) || ' ' ||
                             old.a     || ' ' || typeof(old.a)     || ' ' ||
                             old.b     || ' ' || typeof(old.b)     || ' ' ||
                             old.c     || ' ' || typeof(old.c)
      );
      INSERT INTO log VALUES(new.rowid || ' ' || typeof(new.rowid) || ' ' ||
                             new.a     || ' ' || typeof(new.a)     || ' ' ||
                             new.b     || ' ' || typeof(new.b)     || ' ' ||
                             new.c     || ' ' || typeof(new.c)
      );
    END;
    CREATE TRIGGER t4au AFTER UPDATE ON t4 BEGIN
      INSERT INTO log VALUES(old.rowid || ' ' || typeof(old.rowid) || ' ' ||
                             old.a     || ' ' || typeof(old.a)     || ' ' ||
                             old.b     || ' ' || typeof(old.b)     || ' ' ||
                             old.c     || ' ' || typeof(old.c)
      );
      INSERT INTO log VALUES(new.rowid || ' ' || typeof(new.rowid) || ' ' ||
                             new.a     || ' ' || typeof(new.a)     || ' ' ||
                             new.b     || ' ' || typeof(new.b)     || ' ' ||
                             new.c     || ' ' || typeof(new.c)
      );
    END;
  }
} {}
foreach {n insert log} {

  2 { 
   INSERT INTO t4 VALUES('1', '1', '1');
   DELETE FROM t4;
  } {
    -1 integer 1 text 1 integer 1.0 real 
     1 integer 1 text 1 integer 1.0 real
     1 integer 1 text 1 integer 1.0 real 
     1 integer 1 text 1 integer 1.0 real
  }

  3 { 
   INSERT INTO t4(rowid,a,b,c) VALUES(45, 45, 45, 45);
   DELETE FROM t4;
  } {
    45 integer 45 text 45 integer 45.0 real
    45 integer 45 text 45 integer 45.0 real
    45 integer 45 text 45 integer 45.0 real
    45 integer 45 text 45 integer 45.0 real
  }

  4 { 
   INSERT INTO t4(rowid,a,b,c) VALUES(-42.0, -42.0, -42.0, -42.0);
   DELETE FROM t4;
  } {
    -42 integer -42.0 text -42 integer -42.0 real 
    -42 integer -42.0 text -42 integer -42.0 real
    -42 integer -42.0 text -42 integer -42.0 real 
    -42 integer -42.0 text -42 integer -42.0 real
  }

  5 { 
   INSERT INTO t4(rowid,a,b,c) VALUES(NULL, -42.4, -42.4, -42.4);
   DELETE FROM t4;
  } {
    -1 integer -42.4 text -42.4 real -42.4 real
     1 integer -42.4 text -42.4 real -42.4 real
     1 integer -42.4 text -42.4 real -42.4 real
     1 integer -42.4 text -42.4 real -42.4 real
  }

  6 { 
   INSERT INTO t4 VALUES(7, 7, 7);
   UPDATE t4 SET a=8, b=8, c=8;
  } {
    -1 integer 7 text 7 integer 7.0 real
     1 integer 7 text 7 integer 7.0 real
     1 integer 7 text 7 integer 7.0 real
     1 integer 8 text 8 integer 8.0 real
     1 integer 7 text 7 integer 7.0 real
     1 integer 8 text 8 integer 8.0 real
  }

  7 { 
   UPDATE t4 SET rowid=2;
  } {
     1 integer 8 text 8 integer 8.0 real
     2 integer 8 text 8 integer 8.0 real
     1 integer 8 text 8 integer 8.0 real
     2 integer 8 text 8 integer 8.0 real
  }

  8 { 
   UPDATE t4 SET a='9', b='9', c='9';
  } {
     2 integer 8 text 8 integer 8.0 real
     2 integer 9 text 9 integer 9.0 real
     2 integer 8 text 8 integer 8.0 real
     2 integer 9 text 9 integer 9.0 real
  }

  9 { 
   UPDATE t4 SET a='9.1', b='9.1', c='9.1';
  } {
     2 integer 9   text 9   integer 9.0 real
     2 integer 9.1 text 9.1 real    9.1 real
     2 integer 9   text 9   integer 9.0 real
     2 integer 9.1 text 9.1 real    9.1 real
  }
} {
  do_test triggerC-4.1.$n {
    eval concat [execsql " 
      DELETE FROM log;
      $insert ; 
      SELECT * FROM log ORDER BY rowid;
    "]
  } [join $log " "]
} 

#-------------------------------------------------------------------------
# This block of tests, triggerC-5.*, test that DELETE triggers are fired
# if a row is deleted as a result of OR REPLACE conflict resolution.
#
do_test triggerC-5.1.0 {
  execsql {
    DROP TABLE IF EXISTS t5;
    CREATE TABLE t5(a INTEGER PRIMARY KEY, b);
    CREATE UNIQUE INDEX t5i ON t5(b);
    INSERT INTO t5 VALUES(1, 'a');
    INSERT INTO t5 VALUES(2, 'b');
    INSERT INTO t5 VALUES(3, 'c');

    CREATE TABLE t5g(a, b, c);
    CREATE TRIGGER t5t BEFORE DELETE ON t5 BEGIN
      INSERT INTO t5g VALUES(old.a, old.b, (SELECT count(*) FROM t5));
    END;
  }
} {}
foreach {n dml t5g t5} {
  1 "DELETE FROM t5 WHERE a=2"                        {2 b 3} {1 a 3 c}
  2 "INSERT OR REPLACE INTO t5 VALUES(2, 'd')"        {2 b 3} {1 a 2 d 3 c}
  3 "UPDATE OR REPLACE t5 SET a = 2 WHERE a = 3"      {2 b 3} {1 a 2 c}
  4 "INSERT OR REPLACE INTO t5 VALUES(4, 'b')"        {2 b 3} {1 a 3 c 4 b}
  5 "UPDATE OR REPLACE t5 SET b = 'b' WHERE b = 'c'"  {2 b 3} {1 a 3 b}
  6 "INSERT OR REPLACE INTO t5 VALUES(2, 'c')"        {2 b 3 3 c 2} {1 a 2 c}
  7 "UPDATE OR REPLACE t5 SET a=1, b='b' WHERE a = 3" {1 a 3 2 b 2} {1 b}
} {
  do_test triggerC-5.1.$n {
    execsql "
      BEGIN;
        $dml ;
        SELECT * FROM t5g ORDER BY rowid;
        SELECT * FROM t5 ORDER BY rowid;
      ROLLBACK;
    "
  } [concat $t5g $t5]
}
do_test triggerC-5.2.0 {
  execsql {
    DROP TRIGGER t5t;
    CREATE TRIGGER t5t AFTER DELETE ON t5 BEGIN
      INSERT INTO t5g VALUES(old.a, old.b, (SELECT count(*) FROM t5));
    END;
  }
} {}
foreach {n dml t5g t5} {
  1 "DELETE FROM t5 WHERE a=2"                        {2 b 2} {1 a 3 c}
  2 "INSERT OR REPLACE INTO t5 VALUES(2, 'd')"        {2 b 2} {1 a 2 d 3 c}
  3 "UPDATE OR REPLACE t5 SET a = 2 WHERE a = 3"      {2 b 2} {1 a 2 c}
  4 "INSERT OR REPLACE INTO t5 VALUES(4, 'b')"        {2 b 2} {1 a 3 c 4 b}
  5 "UPDATE OR REPLACE t5 SET b = 'b' WHERE b = 'c'"  {2 b 2} {1 a 3 b}
  6 "INSERT OR REPLACE INTO t5 VALUES(2, 'c')"        {2 b 2 3 c 1} {1 a 2 c}
  7 "UPDATE OR REPLACE t5 SET a=1, b='b' WHERE a = 3" {1 a 2 2 b 1} {1 b}
} {
  do_test triggerC-5.2.$n {
    execsql "
      BEGIN;
        $dml ;
        SELECT * FROM t5g ORDER BY rowid;
        SELECT * FROM t5 ORDER BY rowid;
      ROLLBACK;
    "
  } [concat $t5g $t5]
}
do_test triggerC-5.3.0 {
  execsql { PRAGMA recursive_triggers = off }
} {}
foreach {n dml t5g t5} {
  1 "DELETE FROM t5 WHERE a=2"                        {2 b 2} {1 a 3 c}
  2 "INSERT OR REPLACE INTO t5 VALUES(2, 'd')"        {} {1 a 2 d 3 c}
  3 "UPDATE OR REPLACE t5 SET a = 2 WHERE a = 3"      {} {1 a 2 c}
  4 "INSERT OR REPLACE INTO t5 VALUES(4, 'b')"        {} {1 a 3 c 4 b}
  5 "UPDATE OR REPLACE t5 SET b = 'b' WHERE b = 'c'"  {} {1 a 3 b}
  6 "INSERT OR REPLACE INTO t5 VALUES(2, 'c')"        {} {1 a 2 c}
  7 "UPDATE OR REPLACE t5 SET a=1, b='b' WHERE a = 3" {} {1 b}
} {
  do_test triggerC-5.3.$n {
    execsql "
      BEGIN;
        $dml ;
        SELECT * FROM t5g ORDER BY rowid;
        SELECT * FROM t5 ORDER BY rowid;
      ROLLBACK;
    "
  } [concat $t5g $t5]
}
do_test triggerC-5.3.8 {
  execsql { PRAGMA recursive_triggers = on }
} {}

#-------------------------------------------------------------------------
# This block of tests, triggerC-6.*, tests that "PRAGMA recursive_triggers"
# statements return the current value of the recursive triggers flag.
#
do_test triggerC-6.1 {
  execsql { PRAGMA recursive_triggers }
} {1}
do_test triggerC-6.2 {
  execsql { 
    PRAGMA recursive_triggers = off;
    PRAGMA recursive_triggers;
  }
} {0}
do_test triggerC-6.3 {
  execsql { 
    PRAGMA recursive_triggers = on;
    PRAGMA recursive_triggers;
  }
} {1}

#-------------------------------------------------------------------------
# Test some of the "undefined behaviour" associated with triggers. The
# undefined behaviour occurs when a row being updated or deleted is 
# manipulated by a BEFORE trigger.
# 
do_test triggerC-7.1 {
  execsql {
    CREATE TABLE t8(x);
    CREATE TABLE t7(a, b);
    INSERT INTO t7 VALUES(1, 2);
    INSERT INTO t7 VALUES(3, 4);
    INSERT INTO t7 VALUES(5, 6);
    CREATE TRIGGER t7t BEFORE UPDATE ON t7 BEGIN
      DELETE FROM t7 WHERE a = 1;
    END;
    CREATE TRIGGER t7ta AFTER UPDATE ON t7 BEGIN
      INSERT INTO t8 VALUES('after fired ' || old.rowid || '->' || new.rowid);
    END;
  }
} {}
do_test triggerC-7.2 {
  execsql {
    BEGIN;
      UPDATE t7 SET b=7 WHERE a = 5;
      SELECT * FROM t7;
      SELECT * FROM t8;
    ROLLBACK;
  }
} {3 4 5 7 {after fired 3->3}}
do_test triggerC-7.3 {
  execsql {
    BEGIN;
      UPDATE t7 SET b=7 WHERE a = 1;
      SELECT * FROM t7;
      SELECT * FROM t8;
    ROLLBACK;
  }
} {3 4 5 6}

do_test triggerC-7.4 {
  execsql {
    DROP TRIGGER t7t;
    CREATE TRIGGER t7t BEFORE UPDATE ON t7 WHEN (old.rowid!=1 OR new.rowid!=8)
    BEGIN
      UPDATE t7 set rowid = 8 WHERE rowid=1;
    END;
  }
} {}
do_test triggerC-7.5 {
  execsql {
    BEGIN;
      UPDATE t7 SET b=7 WHERE a = 5;
      SELECT rowid, * FROM t7;
      SELECT * FROM t8;
    ROLLBACK;
  }
} {2 3 4 3 5 7 8 1 2 {after fired 1->8} {after fired 3->3}}
do_test triggerC-7.6 {
  execsql {
    BEGIN;
      UPDATE t7 SET b=7 WHERE a = 1;
      SELECT rowid, * FROM t7;
      SELECT * FROM t8;
    ROLLBACK;
  }
} {2 3 4 3 5 6 8 1 2 {after fired 1->8}}

do_test triggerC-7.7 {
  execsql {
    DROP TRIGGER t7t;
    DROP TRIGGER t7ta;
    CREATE TRIGGER t7t BEFORE DELETE ON t7 BEGIN
      UPDATE t7 set rowid = 8 WHERE rowid=1;
    END;
    CREATE TRIGGER t7ta AFTER DELETE ON t7 BEGIN
      INSERT INTO t8 VALUES('after fired ' || old.rowid);
    END;
  }
} {}
do_test triggerC-7.8 {
  execsql {
    BEGIN;
      DELETE FROM t7 WHERE a = 3;
      SELECT rowid, * FROM t7;
      SELECT * FROM t8;
    ROLLBACK;
  }
} {3 5 6 8 1 2 {after fired 2}}
do_test triggerC-7.9 {
  execsql {
    BEGIN;
      DELETE FROM t7 WHERE a = 1;
      SELECT rowid, * FROM t7;
      SELECT * FROM t8;
    ROLLBACK;
  }
} {2 3 4 3 5 6 8 1 2}

# Ticket [e25d9ea771febc9c311928c1c01c3163dcb26643]
# 
do_test triggerC-9.1 {
  execsql {
    CREATE TABLE t9(a,b);
    CREATE INDEX t9b ON t9(b);
    INSERT INTO t9 VALUES(1,0);
    INSERT INTO t9 VALUES(2,1);
    INSERT INTO t9 VALUES(3,2);
    INSERT INTO t9 SELECT a+3, a+2 FROM t9;
    INSERT INTO t9 SELECT a+6, a+5 FROM t9;
    SELECT a FROM t9 ORDER BY a;
  }
} {1 2 3 4 5 6 7 8 9 10 11 12}
do_test triggerC-9.2 {
  execsql {
    CREATE TRIGGER t9r1 AFTER DELETE ON t9 BEGIN
      DELETE FROM t9 WHERE b=old.a;
    END;
    DELETE FROM t9 WHERE b=4;
    SELECT a FROM t9 ORDER BY a;
  }
} {1 2 3 4}

# At one point (between versions 3.6.18 and 3.6.20 inclusive), an UPDATE 
# that fired a BEFORE trigger that itself updated the same row as the 
# statement causing it to fire was causing a strange side-effect: The 
# values updated by the statement within the trigger were being overwritten 
# by the values in the new.* array, even if those values were not 
# themselves written by the parent UPDATE statement.
#
# Technically speaking this was not a bug. The SQLite documentation says
# that if a BEFORE UPDATE or BEFORE DELETE trigger modifies or deletes the
# row that the parent statement is operating on the results are undefined. 
# But as of 3.6.21 behaviour is restored to the way it was in versions
# 3.6.17 and earlier to avoid causing unnecessary difficulties.
#
do_test triggerC-10.1 {
  execsql {
    CREATE TABLE t10(a, updatecnt DEFAULT 0);
    CREATE TRIGGER t10_bu BEFORE UPDATE OF a ON t10 BEGIN
      UPDATE t10 SET updatecnt = updatecnt+1 WHERE rowid = old.rowid;
    END;
    INSERT INTO t10(a) VALUES('hello');
  }

  # Before the problem was fixed, table t10 would contain the tuple 
  # (world, 0) after running the following script (because the value
  # 1 written to column "updatecnt" was clobbered by the old value 0).
  #
  execsql {
    UPDATE t10 SET a = 'world';
    SELECT * FROM t10;
  }
} {world 1}

do_test triggerC-10.2 {
  execsql {
    UPDATE t10 SET a = 'tcl', updatecnt = 5;
    SELECT * FROM t10;
  }
} {tcl 5}

do_test triggerC-10.3 {
  execsql {
    CREATE TABLE t11(
      c1,   c2,  c3,  c4,  c5,  c6,  c7,  c8,  c9, c10,
      c11, c12, c13, c14, c15, c16, c17, c18, c19, c20,
      c21, c22, c23, c24, c25, c26, c27, c28, c29, c30,
      c31, c32, c33, c34, c35, c36, c37, c38, c39, c40
    );

    CREATE TRIGGER t11_bu BEFORE UPDATE OF c1 ON t11 BEGIN
      UPDATE t11 SET c31 = c31+1, c32=c32+1 WHERE rowid = old.rowid;
    END;

    INSERT INTO t11 VALUES(
      1,   2,  3,  4,  5,  6,  7,  8,  9, 10,
      11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
      21, 22, 23, 24, 25, 26, 27, 28, 29, 30,
      31, 32, 33, 34, 35, 36, 37, 38, 39, 40
    );
  }

  # Before the problem was fixed, table t10 would contain the tuple 
  # (world, 0) after running the following script (because the value
  # 1 written to column "updatecnt" was clobbered by the old value 0).
  #
  execsql {
    UPDATE t11 SET c4=35, c33=22, c1=5;
    SELECT * FROM t11;
  } 
} {5 2 3 35 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 32 33 22 34 35 36 37 38 39 40}

#-------------------------------------------------------------------------
# Test that bug [371bab5d65] has been fixed. BEFORE INSERT and INSTEAD OF
# INSERT triggers with the DEFAULT VALUES INSERT syntax.
#
do_test triggerC-11.0 {
  catchsql { DROP TABLE log }
  execsql  { CREATE TABLE log(a, b) }
} {}

foreach {testno tbl defaults} {
  1 "CREATE TABLE t1(a, b)"                          {{} {}}
  2 "CREATE TABLE t1(a DEFAULT 1, b DEFAULT 'abc')"  {1 abc}
  3 "CREATE TABLE t1(a, b DEFAULT 4.5)"              {{} 4.5}
} {
  do_test triggerC-11.$testno.1 {
    catchsql { DROP TABLE t1 }
    execsql { DELETE FROM log }
    execsql $tbl
    execsql {
      CREATE TRIGGER tt1 BEFORE INSERT ON t1 BEGIN 
        INSERT INTO log VALUES(new.a, new.b);
      END;
      INSERT INTO t1 DEFAULT VALUES;
      SELECT * FROM log;
    }
  } $defaults

  do_test triggerC-11.$testno.2 {
    execsql { DELETE FROM log }
    execsql {
      CREATE TRIGGER tt2 AFTER INSERT ON t1 BEGIN 
        INSERT INTO log VALUES(new.a, new.b);
      END;
      INSERT INTO t1 DEFAULT VALUES;
      SELECT * FROM log;
    }
  } [concat $defaults $defaults]

  do_test triggerC-11.$testno.3 {
    execsql { DROP TRIGGER tt1 }
    execsql { DELETE FROM log }
    execsql {
      INSERT INTO t1 DEFAULT VALUES;
      SELECT * FROM log;
    }
  } $defaults
} 
do_test triggerC-11.4 {
  catchsql { DROP TABLE t2 }
  execsql {
    DELETE FROM log;
    CREATE TABLE t2(a, b);
    CREATE VIEW v2 AS SELECT * FROM t2;
    CREATE TRIGGER tv2 INSTEAD OF INSERT ON v2 BEGIN
      INSERT INTO log VALUES(new.a, new.b);
    END;
    INSERT INTO v2 DEFAULT VALUES;
    SELECT a, b, a IS NULL, b IS NULL FROM log;
  }
} {{} {} 1 1}

do_test triggerC-12.1 {
  db close
  forcedelete test.db
  sqlite3 db test.db

  execsql {
    CREATE TABLE t1(a, b);
    INSERT INTO t1 VALUES(1, 2);
    INSERT INTO t1 VALUES(3, 4);
    INSERT INTO t1 VALUES(5, 6);
    CREATE TRIGGER tr1 AFTER INSERT ON t1 BEGIN SELECT 1 ; END ;
    SELECT count(*) FROM sqlite_master;
  }
} {2}
do_test triggerC-12.2 {
  db eval { SELECT * FROM t1 } {
    if {$a == 3} { execsql { DROP TRIGGER tr1 } }
  }
  execsql { SELECT count(*) FROM sqlite_master }
} {1}

do_execsql_test triggerC-13.1 {
  PRAGMA recursive_triggers = ON;
  CREATE TABLE t12(a, b);
  INSERT INTO t12 VALUES(1, 2);
  CREATE TRIGGER tr12 AFTER UPDATE ON t12 BEGIN
    UPDATE t12 SET a=new.a+1, b=new.b+1;
  END;
} {}
do_catchsql_test triggerC-13.2 {
  UPDATE t12 SET a=a+1, b=b+1;
} {1 {too many levels of trigger recursion}}

#-------------------------------------------------------------------------
# The following tests seek to verify that constant values (i.e. literals)
# are not factored out of loops within trigger programs. SQLite does
# not factor constants out of loops within trigger programs as it may only
# do so in code generated before the first table or index is opened. And
# by the time a trigger program is coded, at least one table or index has
# always been opened.
#
# At one point, due to a bug allowing constant factoring within triggers,
# the following SQL would produce the wrong result.
#
set SQL {
  CREATE TABLE t1(a, b, c);
  CREATE INDEX i1 ON t1(a, c);
  CREATE INDEX i2 ON t1(b, c);
  INSERT INTO t1 VALUES(1, 2, 3);

  CREATE TABLE t2(e, f);
  CREATE INDEX i3 ON t2(e);
  INSERT INTO t2 VALUES(1234567, 3);

  CREATE TABLE empty(x);
  CREATE TABLE not_empty(x);
  INSERT INTO not_empty VALUES(2);

  CREATE TABLE t4(x);
  CREATE TABLE t5(g, h, i);

  CREATE TRIGGER trig BEFORE INSERT ON t4 BEGIN
    INSERT INTO t5 SELECT * FROM t1 WHERE 
        (a IN (SELECT x FROM empty) OR b IN (SELECT x FROM not_empty)) 
        AND c IN (SELECT f FROM t2 WHERE e=1234567);
  END;

  INSERT INTO t4 VALUES(0);
  SELECT * FROM t5;
}

reset_db
do_execsql_test triggerC-14.1 $SQL {1 2 3}
reset_db
optimization_control db factor-constants 0
do_execsql_test triggerC-14.2 $SQL {1 2 3}

#-------------------------------------------------------------------------
# Check that table names used by trigger programs are dequoted exactly
# once.
#
do_execsql_test 15.1.1 {
  PRAGMA recursive_triggers = 1;
  CREATE TABLE node(
      id int not null primary key, 
      pid int not null default 0 references node,
      key varchar not null, 
      path varchar default '',
      unique(pid, key)
      );
  CREATE TRIGGER node_delete_referencing AFTER DELETE ON "node"
    BEGIN
    DELETE FROM "node" WHERE pid = old."id";
  END;
}
do_execsql_test 15.1.2 {
  INSERT INTO node(id, pid, key) VALUES(9, 0, 'test');
  INSERT INTO node(id, pid, key) VALUES(90, 9, 'test1');
  INSERT INTO node(id, pid, key) VALUES(900, 90, 'test2');
  DELETE FROM node WHERE id=9;
  SELECT * FROM node;
}

do_execsql_test 15.2.1 {
  CREATE TABLE   x1  (x);

  CREATE TABLE   x2  (a, b);
  CREATE TABLE '"x2"'(a, b);

  INSERT INTO x2 VALUES(1, 2);
  INSERT INTO x2 VALUES(3, 4);
  INSERT INTO '"x2"' SELECT * FROM x2;

  CREATE TRIGGER x1ai AFTER INSERT ON x1 BEGIN
    INSERT INTO """x2""" VALUES('x', 'y');
    DELETE FROM """x2""" WHERE a=1;
    UPDATE """x2""" SET b = 11 WHERE a = 3;
  END;

  INSERT INTO x1 VALUES('go!');
}

do_execsql_test 15.2.2 { SELECT * FROM x2;       } {1 2 3 4}
do_execsql_test 15.2.3 { SELECT * FROM """x2"""; } {3 11 x y}

#-------------------------------------------------------------------------
# At one point queries such as the following were causing segfaults.
#
do_catchsql_test 16.1 {
  SELECT raise(ABORT, 'msg') FROM sqlite_master 
  UNION SELECT 1 
  ORDER BY raise(IGNORE);
} {1 {1st ORDER BY term does not match any column in the result set}}

do_catchsql_test 16.2 {
  SELECT count(*) FROM sqlite_master 
  GROUP BY raise(IGNORE) 
  HAVING raise(ABORT, 'msg');
} {1 {RAISE() may only be used within a trigger-program}}

finish_test