gitlab.com/CoiaPrant/sqlite3@v1.19.1/testdata/tcl/tkt-b72787b1.test (about)

     1  # 2011 February 21
     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.
    12  #
    13  # This file implements tests to verify that ticket [b72787b1a7] has been
    14  # fixed.  From the ticket:
    15  #
    16  #     The sqlite3ExpirePreparedStatements routine marks all statements
    17  #     as expired. This includes statements that are not expired.
    18  #
    19  #     Steps to reproduce:
    20  #
    21  #        * Prepare a statement (A)
    22  #        * Alter the schema to invalidate cookie in A
    23  #        * Prepare a statement (B)
    24  #        * Run B and have A run as part of B
    25  #        * A will find a bad cookie and cause *all* statements
    26  #          to be expired including the currently running B by calling
    27  #          sqlite3ExpirePreparedStatements
    28  #        * When control returns to B it will then abort 
    29  #
    30  #     The bug is that sqlite3ExpirePreparedStatements expires all statements.
    31  #     Note that B was prepared after the schema change and hence is perfectly
    32  #     valid and then is marked as expired while running.
    33  #
    34  
    35  set testdir [file dirname $argv0]
    36  source $testdir/tester.tcl
    37  
    38  ifcapable !compound {
    39    finish_test
    40    return
    41  }
    42  
    43  unset -nocomplain ::STMT
    44  proc runsql {} {
    45    db eval {CREATE TABLE IF NOT EXISTS t4(q)}
    46    sqlite3_step $::STMT
    47    set rc [sqlite3_column_int $::STMT 0]
    48    sqlite3_reset $::STMT
    49    return $rc
    50  }
    51  
    52  do_test tkt-b72787b1.1 {
    53    db eval {
    54      CREATE TABLE t1(x);
    55      INSERT INTO t1 VALUES(1);
    56      INSERT INTO t1 VALUES(2);
    57      CREATE TABLE t2(y);
    58      INSERT INTO t2 SELECT x+2 FROM t1;
    59      INSERT INTO t2 SELECT x+4 FROM t1;
    60    }
    61    db func runsql ::runsql
    62    set DB [sqlite3_connection_pointer db]
    63    set sql {SELECT max(x) FROM t1}
    64    set ::STMT [sqlite3_prepare_v2 $DB $sql -1 TAIL]
    65  
    66    # The runsql() call on the second row of the first query will
    67    # cause all $::STMT to hit an expired cookie.  Prior to the fix
    68    # for [b72787b1a7, the bad cookie would expire all statements, including
    69    # the following compound SELECT, which would cause a fault when the
    70    # second SELECT was reached.  After the fix, the current statement
    71    # continues to completion.
    72    db eval {
    73      SELECT CASE WHEN y=3 THEN y+100 WHEN y==4 THEN runsql()+200
    74                  ELSE 300+y END FROM t2
    75      UNION ALL
    76      SELECT * FROM t1;
    77    }
    78  } {103 202 305 306 1 2}
    79  
    80  sqlite3_finalize $::STMT
    81  
    82  finish_test