test/hook.test

# 2004 Jan 14
#
# 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.
#
#***********************************************************************
# This file implements regression tests for TCL interface to the
# SQLite library. 
#
# The focus of the tests in this file is the  following interface:
#
#      sqlite_commit_hook    (tests hook-1..hook-3 inclusive)
#      sqlite_update_hook    (tests hook-4-*)
#      sqlite_rollback_hook  (tests hook-5.*)
#
# $Id: hook.test,v 1.15 2009/04/07 14:14:23 danielk1977 Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl
set ::testprefix hook

do_test hook-1.2 {
  db commit_hook
} {}


do_test hook-3.1 {
  set commit_cnt 0
  proc commit_hook {} {
    incr ::commit_cnt
    return 0
  }
  db commit_hook ::commit_hook
  db commit_hook
} {::commit_hook}
do_test hook-3.2 {
  set commit_cnt
} {0}
do_test hook-3.3 {
  execsql {
    CREATE TABLE t2(a,b);
  }
  set commit_cnt
} {1}
do_test hook-3.4 {
  execsql {
    INSERT INTO t2 VALUES(1,2);
    INSERT INTO t2 SELECT a+1, b+1 FROM t2;
    INSERT INTO t2 SELECT a+2, b+2 FROM t2;
  }
  set commit_cnt
} {4}
do_test hook-3.5 {
  set commit_cnt {}
  proc commit_hook {} {
    set ::commit_cnt [execsql {SELECT * FROM t2}]
    return 0
  }
  execsql {
    INSERT INTO t2 VALUES(5,6);
  }
  set commit_cnt
} {1 2 2 3 3 4 4 5 5 6}
do_test hook-3.6 {
  set commit_cnt {}
  proc commit_hook {} {
    set ::commit_cnt [execsql {SELECT * FROM t2}] 
    return 1
  }
  catchsql {
    INSERT INTO t2 VALUES(6,7);
  }
} {1 {constraint failed}}
verify_ex_errcode hook-3.6b SQLITE_CONSTRAINT_COMMITHOOK
do_test hook-3.7 {
  set ::commit_cnt
} {1 2 2 3 3 4 4 5 5 6 6 7}
do_test hook-3.8 {
  execsql {SELECT * FROM t2}
} {1 2 2 3 3 4 4 5 5 6}

# Test turnning off the commit hook
#
do_test hook-3.9 {
  db commit_hook {}
  set ::commit_cnt {}
  execsql {
    INSERT INTO t2 VALUES(7,8);
  }
  set ::commit_cnt
} {}

# Ticket #3564.
#
do_test hook-3.10 {
  forcedelete test2.db test2.db-journal
  sqlite3 db2 test2.db
  proc commit_hook {} {
    set y [db2 one {SELECT y FROM t3 WHERE y>10}]
    return [expr {$y>10}]
  }
  db2 eval {CREATE TABLE t3(x,y)}
  db2 commit_hook commit_hook
  catchsql {INSERT INTO t3 VALUES(1,2)} db2
  catchsql {INSERT INTO t3 VALUES(11,12)} db2
  catchsql {INSERT INTO t3 VALUES(3,4)} db2
  db2 eval {
    SELECT * FROM t3 ORDER BY x;
  }
} {1 2 3 4}
db2 close


#----------------------------------------------------------------------------
# Tests for the update-hook.
#
# 4.1.* - Very simple tests. Test that the update hook is invoked correctly 
#         for INSERT, DELETE and UPDATE statements, including DELETE 
#         statements with no WHERE clause.
# 4.2.* - Check that the update-hook is invoked for rows modified by trigger
#         bodies. Also that the database name is correctly reported when 
#         an attached database is modified.
# 4.3.* - Do some sorting, grouping, compound queries, population and 
#         depopulation of indices, to make sure the update-hook is not 
#         invoked incorrectly.
#
# EVIDENCE-OF: R-21999-45122 The sqlite3_update_hook() interface
# registers a callback function with the database connection identified
# by the first argument to be invoked whenever a row is updated,
# inserted or deleted in a rowid table.

# Simple tests
do_test hook-4.1.1a {
  catchsql {
    DROP TABLE t1;
  }
  unset -nocomplain ::update_hook
  set ::update_hook {}
  db update_hook [list lappend ::update_hook]
  #
  # EVIDENCE-OF: R-52223-27275 The update hook is not invoked when
  # internal system tables are modified (i.e. sqlite_master and
  # sqlite_sequence).
  #
  execsql {
    CREATE TABLE t1(a INTEGER PRIMARY KEY, b);
    CREATE TABLE t1w(a INT PRIMARY KEY, b) WITHOUT ROWID;
  }
  set ::update_hook
} {}
do_test hook-4.1.1b {
  execsql {
    INSERT INTO t1 VALUES(1, 'one');
    INSERT INTO t1 VALUES(2, 'two');
    INSERT INTO t1 VALUES(3, 'three');
    INSERT INTO t1w SELECT * FROM t1;
  }
} {}

# EVIDENCE-OF: R-15506-57666 The second callback argument is one of
# SQLITE_INSERT, SQLITE_DELETE, or SQLITE_UPDATE, depending on the
# operation that caused the callback to be invoked.
#
# EVIDENCE-OF: R-29213-61195 The third and fourth arguments to the
# callback contain pointers to the database and table name containing
# the affected row.
#
# EVIDENCE-OF: R-30809-57812 The final callback parameter is the rowid
# of the row.
#
do_test hook-4.1.2 {
  set ::update_hook {}
  execsql {
    INSERT INTO t1 VALUES(4, 'four');
    DELETE FROM t1 WHERE b = 'two';
    UPDATE t1 SET b = '' WHERE a = 1 OR a = 3;
    DELETE FROM t1 WHERE 1; -- Avoid the truncate optimization (for now)
  }
  set ::update_hook
} [list \
    INSERT main t1 4 \
    DELETE main t1 2 \
    UPDATE main t1 1 \
    UPDATE main t1 3 \
    DELETE main t1 1 \
    DELETE main t1 3 \
    DELETE main t1 4 \
]

# EVIDENCE-OF: R-61808-14344 The sqlite3_update_hook() interface does
# not fire callbacks for changes to a WITHOUT ROWID table.
#
# EVIDENCE-OF: R-33257-44249 The update hook is not invoked when WITHOUT
# ROWID tables are modified.
#
do_test hook-4.1.2w {
  set ::update_hook {}
  execsql {
    INSERT INTO t1w VALUES(4, 'four');
    DELETE FROM t1w WHERE b = 'two';
    UPDATE t1w SET b = '' WHERE a = 1 OR a = 3;
    DELETE FROM t1w WHERE 1; -- Avoid the truncate optimization (for now)
  }
  set ::update_hook
} {}

ifcapable trigger {
  # Update hook is not invoked for changes to sqlite_master
  #
  do_test hook-4.1.3 {
    set ::update_hook {}
    execsql {
      CREATE TRIGGER r1 AFTER INSERT ON t1 BEGIN SELECT RAISE(IGNORE); END;
    }
    set ::update_hook
  } {}
  do_test hook-4.1.4 {
    set ::update_hook {}
    execsql {
      DROP TRIGGER r1;
    }
    set ::update_hook
  } {}
  
  set ::update_hook {}
  do_test hook-4.2.1 {
    catchsql {
      DROP TABLE t2;
    }
    execsql {
      CREATE TABLE t2(c INTEGER PRIMARY KEY, d);
      CREATE TRIGGER t1_trigger AFTER INSERT ON t1 BEGIN
        INSERT INTO t2 VALUES(new.a, new.b);
        UPDATE t2 SET d = d || ' via trigger' WHERE new.a = c;
        DELETE FROM t2 WHERE new.a = c;
      END;
    }
  } {}
  do_test hook-4.2.2 {
    execsql {
      INSERT INTO t1 VALUES(1, 'one');
      INSERT INTO t1 VALUES(2, 'two');
    }
    set ::update_hook
  } [list \
      INSERT main t1 1 \
      INSERT main t2 1 \
      UPDATE main t2 1 \
      DELETE main t2 1 \
      INSERT main t1 2 \
      INSERT main t2 2 \
      UPDATE main t2 2 \
      DELETE main t2 2 \
  ]
} else {
  execsql {
    INSERT INTO t1 VALUES(1, 'one');
    INSERT INTO t1 VALUES(2, 'two');
  }
}

# Update-hook + ATTACH
set ::update_hook {}
ifcapable attach {
  do_test hook-4.2.3 {
    forcedelete test2.db
    execsql {
      ATTACH 'test2.db' AS aux;
      CREATE TABLE aux.t3(a INTEGER PRIMARY KEY, b);
      INSERT INTO aux.t3 SELECT * FROM t1;
      UPDATE t3 SET b = 'two or so' WHERE a = 2;
      DELETE FROM t3 WHERE 1; -- Avoid the truncate optimization (for now)
    }
    set ::update_hook
  } [list \
      INSERT aux t3 1 \
      INSERT aux t3 2 \
      UPDATE aux t3 2 \
      DELETE aux t3 1 \
      DELETE aux t3 2 \
  ]
}

ifcapable trigger {
  execsql {
    DROP TRIGGER t1_trigger;
  }
}

# Test that other vdbe operations involving btree structures do not 
# incorrectly invoke the update-hook.
set ::update_hook {}
do_test hook-4.3.1 {
  execsql {
    CREATE INDEX t1_i ON t1(b);
    INSERT INTO t1 VALUES(3, 'three');
    UPDATE t1 SET b = '';
    DELETE FROM t1 WHERE a > 1;
  }
  set ::update_hook
} [list \
    INSERT main t1 3 \
    UPDATE main t1 1 \
    UPDATE main t1 2 \
    UPDATE main t1 3 \
    DELETE main t1 2 \
    DELETE main t1 3 \
]
set ::update_hook {}
ifcapable compound&&attach {
  do_test hook-4.3.2 {
    execsql {
      SELECT * FROM t1 UNION SELECT * FROM t3;
      SELECT * FROM t1 UNION ALL SELECT * FROM t3;
      SELECT * FROM t1 INTERSECT SELECT * FROM t3;
      SELECT * FROM t1 EXCEPT SELECT * FROM t3;
      SELECT * FROM t1 ORDER BY b;
      SELECT * FROM t1 GROUP BY b;
    }
    set ::update_hook
  } [list]
}

do_test hook-4.4 {
  execsql {
    CREATE TABLE t4(a UNIQUE, b);
    INSERT INTO t4 VALUES(1, 'a');
    INSERT INTO t4 VALUES(2, 'b');
  }
  set ::update_hook [list]
  execsql {
    REPLACE INTO t4 VALUES(1, 'c');
  }
  set ::update_hook
} [list INSERT main t4 3 ]
do_execsql_test hook-4.4.1 {
  SELECT * FROM t4 ORDER BY a;
} {1 c 2 b}
do_test hook-4.4.2 {
  set ::update_hook [list]
  execsql {
    PRAGMA recursive_triggers = on;
    REPLACE INTO t4 VALUES(1, 'd');
  }
  set ::update_hook
} [list INSERT main t4 4 ]
do_execsql_test hook-4.4.3 {
  SELECT * FROM t4 ORDER BY a;
} {1 d 2 b}

db update_hook {}
#
#----------------------------------------------------------------------------

#----------------------------------------------------------------------------
# Test the rollback-hook. The rollback-hook is a bit more complicated than
# either the commit or update hooks because a rollback can happen 
# explicitly (an sql ROLLBACK statement) or implicitly (a constraint or 
# error condition).
#
# hook-5.1.* - Test explicit rollbacks.
# hook-5.2.* - Test implicit rollbacks caused by constraint failure.
#
# hook-5.3.* - Test implicit rollbacks caused by IO errors.
# hook-5.4.* - Test implicit rollbacks caused by malloc() failure.
# hook-5.5.* - Test hot-journal rollbacks. Or should the rollback hook 
#              not be called for these?
#

do_test hook-5.0 {
  # Configure the rollback hook to increment global variable 
  # $::rollback_hook each time it is invoked.
  set ::rollback_hook 0
  db rollback_hook [list incr ::rollback_hook]
} {}

# Test explicit rollbacks. Not much can really go wrong here.
#
do_test hook-5.1.1 {
  set ::rollback_hook 0
  execsql {
    BEGIN;
    ROLLBACK;
  }
  set ::rollback_hook
} {1}

# Test implicit rollbacks caused by constraints.
#
do_test hook-5.2.1 {
  set ::rollback_hook 0
  catchsql {
    DROP TABLE t1;
    CREATE TABLE t1(a PRIMARY KEY, b);
    INSERT INTO t1 VALUES('one', 'I');
    INSERT INTO t1 VALUES('one', 'I');
  }
  set ::rollback_hook
} {1}
do_test hook-5.2.2 {
  # Check that the INSERT transaction above really was rolled back.
  execsql {
    SELECT count(*) FROM t1;
  }
} {1}

#
# End rollback-hook testing.
#----------------------------------------------------------------------------

#----------------------------------------------------------------------------
# Test that if a commit-hook returns non-zero (causing a rollback), the
# rollback-hook is invoked.
#
proc commit_hook {} {
  lappend ::hooks COMMIT
  return 1
}
proc rollback_hook {} {
  lappend ::hooks ROLLBACK
}
do_test hook-6.1 {
  set ::hooks [list]
  db commit_hook commit_hook
  db rollback_hook rollback_hook
  catchsql {
    BEGIN;
      INSERT INTO t1 VALUES('two', 'II');
    COMMIT;
  }
  execsql { SELECT * FROM t1 }
} {one I}
do_test hook-6.2 {
  set ::hooks
} {COMMIT ROLLBACK}
unset ::hooks

#----------------------------------------------------------------------------
# The following tests - hook-7.* - test the pre-update hook.
#
ifcapable !preupdate {
  finish_test
  return
}
#
# 7.1.1 - INSERT statement.
# 7.1.2 - INSERT INTO ... SELECT statement.
# 7.1.3 - REPLACE INTO ... (rowid conflict)
# 7.1.4 - REPLACE INTO ... (other index conflicts)
# 7.1.5 - REPLACE INTO ... (both rowid and other index conflicts)
#
# 7.2.1 - DELETE statement.
# 7.2.2 - DELETE statement that uses the truncate optimization.
#
# 7.3.1 - UPDATE statement.
# 7.3.2 - UPDATE statement that modifies the rowid.
# 7.3.3 - UPDATE OR REPLACE ... (rowid conflict).
# 7.3.4 - UPDATE OR REPLACE ... (other index conflicts)
# 7.3.4 - UPDATE OR REPLACE ... (both rowid and other index conflicts)
#
# 7.4.1 - Test that the pre-update-hook is invoked only once if a row being
#         deleted is removed by a BEFORE trigger.
#
# 7.4.2 - Test that the pre-update-hook is invoked if a BEFORE trigger 
#         removes a row being updated. In this case the update hook should
#         be invoked with SQLITE_INSERT as the opcode when inserting the
#         new version of the row.
#         
# TODO: Short records (those created before a column is added to a table 
#       using ALTER TABLE)
#

proc do_preupdate_test {tn sql x} {
  set X [list]
  foreach elem $x {lappend X $elem}
  uplevel do_test $tn [list "
    set ::preupdate \[list\]
    execsql { $sql }
    set ::preupdate
  "] [list $X]
}

proc preupdate_hook {args} {
  set type [lindex $args 0]
  eval lappend ::preupdate $args
  if {$type != "INSERT"} {
    for {set i 0} {$i < [db preupdate count]} {incr i} {
      lappend ::preupdate [db preupdate old $i]
    }
  }
  if {$type != "DELETE"} {
    for {set i 0} {$i < [db preupdate count]} {incr i} {
      set rc [catch { db preupdate new $i } v]
      lappend ::preupdate $v
    }
  }
}

db close
forcedelete test.db
sqlite3 db test.db
db preupdate hook preupdate_hook

# Set up a schema to use for tests 7.1.* to 7.3.*.
do_execsql_test 7.0 { 
  CREATE TABLE t1(a, b); 
  CREATE TABLE t2(x, y); 
  CREATE TABLE t3(i, j, UNIQUE(i));

  INSERT INTO t2 VALUES('a', 'b');
  INSERT INTO t2 VALUES('c', 'd');

  INSERT INTO t3 VALUES(4, 16);
  INSERT INTO t3 VALUES(5, 25);
  INSERT INTO t3 VALUES(6, 36);
} 

do_preupdate_test 7.1.1 {
  INSERT INTO t1 VALUES('x', 'y')
} {INSERT main t1 1 1  x y}

# 7.1.2.1 does not use the xfer optimization. 7.1.2.2 does.
do_preupdate_test 7.1.2.1 {
  INSERT INTO t1 SELECT y, x FROM t2;
} {INSERT main t1 2 2 b a   INSERT main t1 3 3 d c}
do_preupdate_test 7.1.2.2 {
  INSERT INTO t1 SELECT * FROM t2;
} {INSERT main t1 4 4 a b   INSERT main t1 5 5 c d}

do_preupdate_test 7.1.3 {
  REPLACE INTO t1(rowid, a, b) VALUES(1, 1, 1);
} {
  DELETE main t1 1 1   x y
  INSERT main t1 1 1   1 1
}

do_preupdate_test 7.1.4 {
  REPLACE INTO t3 VALUES(4, NULL);
} {
  DELETE main t3 1 1   4 16
  INSERT main t3 4 4   4 {}
}

do_preupdate_test 7.1.5 {
  REPLACE INTO t3(rowid, i, j) VALUES(2, 6, NULL);
} {
  DELETE main t3 2 2  5 25
  DELETE main t3 3 3  6 36
  INSERT main t3 2 2  6 {}
}

do_execsql_test 7.2.0 { SELECT rowid FROM t1 } {1 2 3 4 5}

do_preupdate_test 7.2.1 {
  DELETE FROM t1 WHERE rowid = 3
} {
  DELETE main t1 3 3  d c
}
do_preupdate_test 7.2.2 {
  DELETE FROM t1
} {
  DELETE main t1 1 1   1 1
  DELETE main t1 2 2   b a
  DELETE main t1 4 4   a b
  DELETE main t1 5 5   c d
}

do_execsql_test 7.3.0 { 
  DELETE FROM t1;
  DELETE FROM t2;
  DELETE FROM t3;

  INSERT INTO t2 VALUES('a', 'b');
  INSERT INTO t2 VALUES('c', 'd');

  INSERT INTO t3 VALUES(4, 16);
  INSERT INTO t3 VALUES(5, 25);
  INSERT INTO t3 VALUES(6, 36);
}

do_preupdate_test 7.3.1 {
  UPDATE t2 SET y = y||y;
} {
  UPDATE main t2 1 1   a b  a bb
  UPDATE main t2 2 2   c d  c dd
}

do_preupdate_test 7.3.2 {
  UPDATE t2 SET rowid = rowid-1;
} {
  UPDATE main t2 1 0   a bb  a bb
  UPDATE main t2 2 1   c dd  c dd
}

do_preupdate_test 7.3.3 {
  UPDATE OR REPLACE t2 SET rowid = 1 WHERE x = 'a'
} {
  DELETE main t2 1 1   c dd
  UPDATE main t2 0 1   a bb  a bb
}

do_preupdate_test 7.3.4.1 {
  UPDATE OR REPLACE t3 SET i = 5 WHERE i = 6
} {
  DELETE main t3 2 2   5 25
  UPDATE main t3 3 3   6 36  5 36
}

do_execsql_test 7.3.4.2 {
  INSERT INTO t3 VALUES(10, 100);
  SELECT rowid, * FROM t3;
} {1 4 16   3 5 36   4 10 100}

do_preupdate_test 7.3.5 {
  UPDATE OR REPLACE t3 SET rowid = 1, i = 5 WHERE j = 100;
} {
  DELETE main t3 1 1    4  16
  DELETE main t3 3 3    5  36
  UPDATE main t3 4 1   10 100  5 100
}

do_execsql_test 7.4.1.0 {
  CREATE TABLE t4(a, b);
  INSERT INTO t4 VALUES('a', 1);
  INSERT INTO t4 VALUES('b', 2);
  INSERT INTO t4 VALUES('c', 3);

  CREATE TRIGGER t4t BEFORE DELETE ON t4 BEGIN
    DELETE FROM t4 WHERE b = 1;
  END;
}

do_preupdate_test 7.4.1.1 {
  DELETE FROM t4 WHERE b = 3
} {
  DELETE main t4 1 1   a 1
  DELETE main t4 3 3   c 3
}

do_execsql_test 7.4.1.2 {
  INSERT INTO t4(rowid, a, b) VALUES(1, 'a', 1);
  INSERT INTO t4(rowid, a, b) VALUES(3, 'c', 3);
}
do_preupdate_test 7.4.1.3 {
  DELETE FROM t4 WHERE b = 1
} {
  DELETE main t4 1 1   a 1
}

do_execsql_test 7.4.2.0 {
  CREATE TABLE t5(a, b);
  INSERT INTO t5 VALUES('a', 1);
  INSERT INTO t5 VALUES('b', 2);
  INSERT INTO t5 VALUES('c', 3);

  CREATE TRIGGER t5t BEFORE UPDATE ON t5 BEGIN
    DELETE FROM t5 WHERE b = 1;
  END;
}
do_preupdate_test 7.4.2.1 {
  UPDATE t5 SET b = 4 WHERE a = 'c'
} {
  DELETE main t5 1 1   a 1
  UPDATE main t5 3 3   c 3  c 4
}

do_execsql_test 7.4.2.2 {
  INSERT INTO t5(rowid, a, b) VALUES(1, 'a', 1);
}

do_preupdate_test 7.4.2.3 {
  UPDATE t5 SET b = 5 WHERE a = 'a'
} {
  DELETE main t5 1 1   a 1
}

do_execsql_test 7.5.1.0 {
  CREATE TABLE t7(a, b);
  INSERT INTO t7 VALUES('one', 'two');
  INSERT INTO t7 VALUES('three', 'four');
  ALTER TABLE t7 ADD COLUMN c DEFAULT NULL;
}

do_preupdate_test 7.5.1.1 {
  DELETE FROM t7 WHERE a = 'one'
} {
  DELETE main t7 1 1   one two {}
}

do_preupdate_test 7.5.1.2 {
  UPDATE t7 SET b = 'five'
} {
  UPDATE main t7 2 2   three four {}  three five {}
}

do_execsql_test 7.5.2.0 {
  CREATE TABLE t8(a, b);
  INSERT INTO t8 VALUES('one', 'two');
  INSERT INTO t8 VALUES('three', 'four');
  ALTER TABLE t8 ADD COLUMN c DEFAULT 'xxx';
}

ifcapable !session {
  # At time of writing, these two are broken. They demonstrate that the
  # sqlite3_preupdate_old() method does not handle the case where ALTER TABLE
  # has been used to add a column with a default value other than NULL.
  #
  do_preupdate_test 7.5.2.1 {
    DELETE FROM t8 WHERE a = 'one'
  } {
    DELETE main t8 1 1   one two xxx
  }
  do_preupdate_test 7.5.2.2 {
    UPDATE t8 SET b = 'five'
  } {
    UPDATE main t8 2 2   three four xxx  three five xxx
  }
}

# This block of tests verifies that IPK values are correctly reported
# by the sqlite3_preupdate_old() and sqlite3_preupdate_new() functions.
#
do_execsql_test 7.6.1 { CREATE TABLE t9(a, b INTEGER PRIMARY KEY, c) }
do_preupdate_test 7.6.2 {
  INSERT INTO t9 VALUES(1, 2, 3);
  UPDATE t9 SET b = b+1, c = c+1;
  DELETE FROM t9 WHERE a = 1;
} {
  INSERT main t9 2 2   1 2 3
  UPDATE main t9 2 3   1 2 3   1 3 4
  DELETE main t9 3 3   1 3 4
}

#--------------------------------------------------------------------------
# Test that the sqlite3_preupdate_depth() API seems to work.
#
proc preupdate_hook {args} {
  set type [lindex $args 0]
  eval lappend ::preupdate $args
  eval lappend ::preupdate [db preupdate depth]

  if {$type != "INSERT"} {
    for {set i 0} {$i < [db preupdate count]} {incr i} {
      lappend ::preupdate [db preupdate old $i]
    }
  }
  if {$type != "DELETE"} {
    for {set i 0} {$i < [db preupdate count]} {incr i} {
      set rc [catch { db preupdate new $i } v]
      lappend ::preupdate $v
    }
  }
}

db close
forcedelete test.db
sqlite3 db test.db
db preupdate hook preupdate_hook

do_execsql_test 7.6.1 { 
  CREATE TABLE t1(x PRIMARY KEY);
  CREATE TABLE t2(x PRIMARY KEY);
  CREATE TABLE t3(x PRIMARY KEY);
  CREATE TABLE t4(x PRIMARY KEY);

  CREATE TRIGGER a AFTER INSERT ON t1 BEGIN INSERT INTO t2 VALUES(new.x); END;
  CREATE TRIGGER b AFTER INSERT ON t2 BEGIN INSERT INTO t3 VALUES(new.x); END;
  CREATE TRIGGER c AFTER INSERT ON t3 BEGIN INSERT INTO t4 VALUES(new.x); END;

  CREATE TRIGGER d AFTER UPDATE ON t1 BEGIN UPDATE t2 SET x = new.x; END;
  CREATE TRIGGER e AFTER UPDATE ON t2 BEGIN UPDATE t3 SET x = new.x; END;
  CREATE TRIGGER f AFTER UPDATE ON t3 BEGIN UPDATE t4 SET x = new.x; END;

  CREATE TRIGGER g AFTER DELETE ON t1 BEGIN DELETE FROM t2 WHERE 1; END;
  CREATE TRIGGER h AFTER DELETE ON t2 BEGIN DELETE FROM t3 WHERE 1; END;
  CREATE TRIGGER i AFTER DELETE ON t3 BEGIN DELETE FROM t4 WHERE 1; END;
}

do_preupdate_test 7.6.2 {
  INSERT INTO t1 VALUES('xyz');
} {
  INSERT main t1 1 1   0      xyz
  INSERT main t2 1 1   1      xyz
  INSERT main t3 1 1   2      xyz
  INSERT main t4 1 1   3      xyz
}
do_preupdate_test 7.6.3 {
  UPDATE t1 SET x = 'abc';
} {
  UPDATE main t1 1 1   0      xyz abc
  UPDATE main t2 1 1   1      xyz abc
  UPDATE main t3 1 1   2      xyz abc
  UPDATE main t4 1 1   3      xyz abc
}
do_preupdate_test 7.6.4 {
  DELETE FROM t1 WHERE 1;
} {
  DELETE main t1 1 1   0      abc
  DELETE main t2 1 1   1      abc
  DELETE main t3 1 1   2      abc
  DELETE main t4 1 1   3      abc
}

do_execsql_test 7.6.5 { 
  DROP TRIGGER a; DROP TRIGGER b; DROP TRIGGER c;
  DROP TRIGGER d; DROP TRIGGER e; DROP TRIGGER f;
  DROP TRIGGER g; DROP TRIGGER h; DROP TRIGGER i;

  CREATE TRIGGER a BEFORE INSERT ON t1 BEGIN INSERT INTO t2 VALUES(new.x); END;
  CREATE TRIGGER b BEFORE INSERT ON t2 BEGIN INSERT INTO t3 VALUES(new.x); END;
  CREATE TRIGGER c BEFORE INSERT ON t3 BEGIN INSERT INTO t4 VALUES(new.x); END;

  CREATE TRIGGER d BEFORE UPDATE ON t1 BEGIN UPDATE t2 SET x = new.x; END;
  CREATE TRIGGER e BEFORE UPDATE ON t2 BEGIN UPDATE t3 SET x = new.x; END;
  CREATE TRIGGER f BEFORE UPDATE ON t3 BEGIN UPDATE t4 SET x = new.x; END;

  CREATE TRIGGER g BEFORE DELETE ON t1 BEGIN DELETE FROM t2 WHERE 1; END;
  CREATE TRIGGER h BEFORE DELETE ON t2 BEGIN DELETE FROM t3 WHERE 1; END;
  CREATE TRIGGER i BEFORE DELETE ON t3 BEGIN DELETE FROM t4 WHERE 1; END;
}

do_preupdate_test 7.6.6 {
  INSERT INTO t1 VALUES('xyz');
} {
  INSERT main t4 1 1   3      xyz
  INSERT main t3 1 1   2      xyz
  INSERT main t2 1 1   1      xyz
  INSERT main t1 1 1   0      xyz
}
do_preupdate_test 7.6.3 {
  UPDATE t1 SET x = 'abc';
} {
  UPDATE main t4 1 1   3      xyz abc
  UPDATE main t3 1 1   2      xyz abc
  UPDATE main t2 1 1   1      xyz abc
  UPDATE main t1 1 1   0      xyz abc
}
do_preupdate_test 7.6.4 {
  DELETE FROM t1 WHERE 1;
} {
  DELETE main t4 1 1   3      abc
  DELETE main t3 1 1   2      abc
  DELETE main t2 1 1   1      abc
  DELETE main t1 1 1   0      abc
}

finish_test