SQLite

} {
  DELETE FROM t2 WHERE b=1;
} {
  {DELETE t2 0 .XX. {{} {} i 1 i 1 {} {}} {}} 
  {DELETE t2 0 .XX. {{} {} i 1 i 2 {} {}} {}} 
}

#-------------------------------------------------------------------------
# More rigorous testing of the _patchset(), _apply and _concat() APIs.
#
# The inputs to each test are a populate database and a list of DML 
# statements. This test determines that the final database is the same
# if:
# 
#   1) the statements are executed directly on the database.
#
#   2) a single patchset is collected while executing the statements and
#      then applied to a copy of the original database file.
#
#   3) individual patchsets are collected for statement while executing
#      them and concatenated together before being applied to a copy of
#      the original database. The concatenation is done in a couple of
#      different ways - linear, pairwise etc.
#
# All tests, as it happens, are run with both changesets and patchsets.
# But the focus is on patchset capabilities.
#

# Return a checksum of the contents of the database file. Implicit IPK
# columns are not included in the checksum - just modifying rowids does
# not change the database checksum.
#
proc databasecksum {db} {
  set alltab [$db eval {SELECT name FROM sqlite_master WHERE type='table'}]
  foreach tab $alltab {
    $db eval "SELECT * FROM $tab LIMIT 1" res { }
    set slist [list]
    foreach col [lsort $res(*)] {
      lappend slist "quote($col)"
    }
    set sql "SELECT [join $slist ,] FROM $tab"
    append txt "[lsort [$db eval $sql]]\n"
  }
  return [md5 $txt]
}

proc do_patchset_test {tn tstcmd lSql} {
  if {$tstcmd != "patchset" && $tstcmd != "changeset"} {
    error "have $tstcmd: must be patchset or changeset"
  }

  foreach fname {test.db2 test.db3 test.db4 test.db5} {
    forcedelete $fname
    forcecopy test.db $fname
  }

  # Execute the SQL statements on [db]. Collect a patchset for each 
  # individual statement, as well as a single patchset for the entire 
  # operation.
  sqlite3session S db main
  S attach *
  foreach sql $lSql { 
    sqlite3session T db main
    T attach *
    db eval $sql 
    lappend lPatch [T patchset]
    T delete
  }
  set patchset [S patchset]
  S delete

  # Calculate a checksum for the final database.
  set cksum [databasecksum db]

  # 1. Apply the single large patchset to test.db2
  sqlite3 db2 test.db2
  sqlite3changeset_apply db2 $patchset noop
  uplevel [list do_test $tn.1 { databasecksum db2 } $cksum ]
  db2 close
  
  # 2. Apply each of the single-statement patchsets to test.db3
  sqlite3 db2 test.db3
  foreach p $lPatch {
    sqlite3changeset_apply db2 $p noop
  }
  uplevel [list do_test $tn.2 { databasecksum db2 } $cksum ]
  db2 close

  # 3. Concatenate all single-statement patchsets into a single large
  #    patchset, then apply it to test.db4.
  #
  sqlite3 db2 test.db4
  set big ""
  foreach p $lPatch {
    set big [sqlite3changeset_concat $big $p]
  }
  sqlite3changeset_apply db2 $big noop
  uplevel [list do_test $tn.3 { databasecksum db2 } $cksum ]
  db2 close

  # 4. Concatenate all single-statement patchsets pairwise into a single
  #    large patchset, then apply it to test.db5. Pairwise concatenation:
  #
  #         a b c d e f g h i j k
  #      -> {a b} {c d} {e f} {g h} {i j} k
  #      -> {a b c d} {e f g h} {i j k}
  #      -> {a b c d e f g h} {i j k}
  #      -> {a b c d e f g h i j k}
  #      -> APPLY!
  #
  sqlite3 db2 test.db5
  set L $lPatch
  while {[llength $L] > 1} {
    set O [list]
    for {set i 0} {$i < [llength $L]} {incr i 2} {
      if {$i==[llength $L]-1} {
        lappend O [lindex $L $i]
      } else {
        set i1 [expr $i+1]
        lappend O [sqlite3changeset_concat [lindex $L $i] [lindex $L $i1]]
      }
    }
    set L $O
  }
  sqlite3changeset_apply db2 [lindex $L 0] noop
  uplevel [list do_test $tn.4 { databasecksum db2 } $cksum ]
  db2 close
}

proc do_patchset_changeset_test {tn initsql args} {
  foreach tstcmd {patchset changeset} {
    reset_db
    execsql $initsql
    foreach sql $args {
      set lSql [split $sql ";"]
      uplevel [list do_patchset_test $tn.$tstcmd $tstcmd $lSql]
    }
  }
}

do_patchset_changeset_test 5.1 {
  CREATE TABLE t1(a PRIMARY KEY, b, c);
  INSERT INTO t1 VALUES(1, 2, 3);
} {
  INSERT INTO t1 VALUES(4, 5, 6);
  DELETE FROM t1 WHERE a=1;
} {
  INSERT INTO t1 VALUES(7, 8, 9);
  UPDATE t1 SET c = 5;
  INSERT INTO t1 VALUES(10, 11, 12);
  UPDATE t1 SET c = 6;
  INSERT INTO t1 VALUES(13, 14, 15);
} {
  UPDATE t1 SET c=c+1;
  DELETE FROM t1 WHERE (a%2);
} 

do_patchset_changeset_test 5.2 {
  CREATE TABLE t1(a PRIMARY KEY, b, c);
  CREATE TABLE t2(a, b, c, d, PRIMARY KEY(c, b));
} {
  INSERT INTO t1 VALUES(x'00', 0, 'zero');
  INSERT INTO t1 VALUES(x'01', 1, 'one');
  INSERT INTO t1 VALUES(x'02', 4, 'four');
  INSERT INTO t1 VALUES(x'03', 9, 'nine');
  INSERT INTO t1 VALUES(x'04', 16, 'sixteen');
  INSERT INTO t1 VALUES(x'05', 25, 'twenty-five');
} {
  UPDATE t1 SET a = b WHERE b<=4;
  INSERT INTO t2 SELECT NULL, * FROM t1;
  DELETE FROM t1 WHERE b=25;
} {
  DELETE FROM t2;
  INSERT INTO t2 SELECT NULL, * FROM t1;
  DELETE FROM t1;
  INSERT INTO t1 SELECT b, c, d FROM t2;
  UPDATE t1 SET b = b+1;
  UPDATE t1 SET b = b+1;
  UPDATE t1 SET b = b+1;
}


finish_test