gitlab.com/CoiaPrant/sqlite3@v1.19.1/testdata/tcl/ovfl.test (about)

     1  # 2014 October 01
     2  #
     3  # The author disclaims copyright to this source code.  In place of
     4  # a legal notice, here is a blessing:
     5  #
     6  #    May you do good and not evil.
     7  #    May you find forgiveness for yourself and forgive others.
     8  #    May you share freely, never taking more than you give.
     9  #
    10  #***********************************************************************
    11  # This file implements regression tests for SQLite library.  The
    12  # focus of this file is testing the SQLITE_DIRECT_OVERFLOW_READ logic.
    13  #
    14  
    15  set testdir [file dirname $argv0]
    16  source $testdir/tester.tcl
    17  set testprefix ovfl
    18  
    19  # Populate table t2:
    20  #
    21  #   CREATE TABLE t1(c1 TEXT, c2 TEXT);
    22  #
    23  # with 2000 rows. In each row, c2 spans multiple overflow pages. The text
    24  # value of c1 ranges in size from 1 to 2000 bytes. The idea is to create
    25  # at least one row where the first byte of c2 is also the first byte of
    26  # an overflow page. This was at one point exposing an obscure bug in the
    27  # SQLITE_DIRECT_OVERFLOW_READ logic.
    28  #
    29  do_test 1.1 {
    30    set c2 [string repeat abcdefghij 200]
    31    execsql {
    32      PRAGMA cache_size = 10;
    33      CREATE TABLE t1(c1 TEXT, c2 TEXT);
    34      BEGIN;
    35    }
    36    for {set i 1} {$i <= 2000} {incr i} {
    37      set c1 [string repeat . $i]
    38      execsql { INSERT INTO t1 VALUES($c1, $c2) }
    39    }
    40    execsql COMMIT
    41  } {}
    42  
    43  do_execsql_test 1.2 {
    44    SELECT sum(length(c2)) FROM t1;
    45  } [expr 2000 * 2000]
    46  
    47  finish_test