gitlab.com/CoiaPrant/sqlite3@v1.19.1/testdata/tcl/backup4.test (about)

     1  # 2012 October 13
     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  #
    12  # The tests in this file verify that if an empty database (zero bytes in 
    13  # size) is used as the source of a backup operation, the final destination
    14  # database is one page in size.
    15  #
    16  # The destination must consist of at least one page as truncating a 
    17  # database file to zero bytes is equivalent to resetting the database
    18  # schema cookie and change counter. Doing that could cause other clients
    19  # to become confused and continue using out-of-date cache data.
    20  #
    21  
    22  set testdir [file dirname $argv0]
    23  source $testdir/tester.tcl
    24  set testprefix backup4
    25  
    26  # The codec logic does not work for zero-length database files.  A database
    27  # file must contain at least one page in order to be recognized as an
    28  # encrypted database.
    29  do_not_use_codec
    30  
    31  #-------------------------------------------------------------------------
    32  # At one point this test was failing because [db] was using an out of
    33  # date schema in test case 1.2.
    34  #
    35  do_execsql_test 1.0 {
    36    CREATE TABLE t1(x, y, UNIQUE(x, y));
    37    INSERT INTO t1 VALUES('one', 'two');
    38    SELECT * FROM t1 WHERE x='one';
    39    PRAGMA integrity_check;
    40  } {one two ok}
    41  
    42  do_test 1.1 {
    43    sqlite3 db1 :memory:
    44    db1 backup test.db
    45    sqlite3 db1 test.db
    46    db1 eval {
    47      CREATE TABLE t1(x, y);
    48      INSERT INTO t1 VALUES('one', 'two');
    49    }
    50    db1 close
    51  } {}
    52  
    53  do_execsql_test 1.2 {
    54    SELECT * FROM t1 WHERE x='one';
    55    PRAGMA integrity_check;
    56  } {one two ok}
    57  
    58  db close
    59  forcedelete test.db
    60  forcedelete test.db2
    61  sqlite3 db test.db
    62  
    63  #-------------------------------------------------------------------------
    64  # Test that if the source is zero bytes, the destination database 
    65  # consists of a single page only.
    66  #
    67  do_execsql_test 2.1 {
    68    CREATE TABLE t1(a, b);
    69    CREATE INDEX i1 ON t1(a, b);
    70  }
    71  do_test 2.2 { file size test.db } [expr $AUTOVACUUM ? 4096 : 3072]
    72  
    73  do_test 2.3 {
    74    sqlite3 db1 test.db2
    75    db1 backup test.db
    76    db1 close
    77    file size test.db
    78  } {1024}
    79  
    80  do_test 2.4 { file size test.db2 } 0
    81  
    82  db close
    83  forcedelete test.db
    84  forcedelete test.db2
    85  sqlite3 db test.db
    86  
    87  #-------------------------------------------------------------------------
    88  # Test that if the destination has a page-size larger than the implicit
    89  # page-size of the source, the final destination database still consists
    90  # of a single page.
    91  #
    92  do_execsql_test 3.1 {
    93    PRAGMA page_size = 4096;
    94    CREATE TABLE t1(a, b);
    95    CREATE INDEX i1 ON t1(a, b);
    96  }
    97  do_test 3.2 { file size test.db } [expr $AUTOVACUUM ? 16384 : 12288]
    98  
    99  do_test 3.3 {
   100    sqlite3 db1 test.db2
   101    db1 backup test.db
   102    db1 close
   103    file size test.db
   104  } {1024}
   105  
   106  do_test 3.4 { file size test.db2 } 0
   107  
   108  finish_test