test/progress.test

# 2001 September 15
#
# 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 SQLite library.  The
# focus of this file is testing the 'progress callback'.
#
# $Id: progress.test,v 1.2 2004/05/31 08:26:50 danielk1977 Exp $

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

# Build some test data
#
execsql {
  BEGIN;
  CREATE TABLE t1(a);
  INSERT INTO t1 VALUES(1);
  INSERT INTO t1 VALUES(2);
  INSERT INTO t1 VALUES(3);
  INSERT INTO t1 VALUES(4);
  INSERT INTO t1 VALUES(5);
  INSERT INTO t1 VALUES(6);
  INSERT INTO t1 VALUES(7);
  INSERT INTO t1 VALUES(8);
  INSERT INTO t1 VALUES(9);
  INSERT INTO t1 VALUES(10);
  COMMIT;
}


# Test that the progress callback is invoked.
do_test progress-1.0 {
  set counter 0
  db progress 1 "[namespace code {incr counter}] ; expr 0"
  execsql {
    SELECT * FROM t1
  }
  expr $counter > 1
} 1

# Test that the query is abandoned when the progress callback returns non-zero
do_test progress1.1 {
  set counter 0
  db progress 1 "[namespace code {incr counter}] ; expr 1"
  set rc [catch {execsql {
    SELECT * FROM t1
  }}]
  list $counter $rc
} {1 1}

# Test that the query is rolled back when the progress callback returns
# non-zero.
do_test progress1.2 {

  # This figures out how many opcodes it takes to copy 5 extra rows into t1.
  db progress 1 "[namespace code {incr five_rows}] ; expr 0"
  set five_rows 0
  execsql {
    INSERT INTO t1 SELECT a+10 FROM t1 WHERE a < 6
  }
  db progress 0 ""
  execsql {
    DELETE FROM t1 WHERE a > 10
  }

  # Now set up the progress callback to abandon the query after the number of
  # opcodes to copy 5 rows. That way, when we try to copy 6 rows, we know
  # some data will have been inserted into the table by the time the progress
  # callback abandons the query.
  db progress $five_rows "expr 1"
  catchsql {
    INSERT INTO t1 SELECT a+10 FROM t1 WHERE a < 9
  }
  execsql {
    SELECT count(*) FROM t1
  }
} 10

# Test that an active transaction remains active and not rolled back after the
# progress query abandons a query. 
do_test progress1.3 {

  db progress 0 ""
  execsql BEGIN
  execsql {
    INSERT INTO t1 VALUES(11)
  }
  db progress 1 "expr 1"
  catchsql {
    INSERT INTO t1 VALUES(12)
  }
  db progress 0 ""
  execsql COMMIT
  execsql {
    SELECT count(*) FROM t1
  }
} 11

# Check that a value of 0 for N means no progress callback
do_test progress1.4 {
  set counter 0
  db progress 0 "[namespace code {incr counter}] ; expr 0"
  execsql {
    SELECT * FROM t1;
  }
  set counter
} 0

db progress 0 ""

finish_test