github.com/jdgcs/sqlite3@v1.12.1-0.20210908114423-bc5f96e4dd51/testdata/tcl/tempdb2.test (about)

     1  # 2016 March 3
     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  set testdir [file dirname $argv0]
    13  source $testdir/tester.tcl
    14  set testprefix tempdb2
    15  
    16  db close
    17  sqlite3 db ""
    18  
    19  set unlocked unlocked
    20  if {$::TEMP_STORE>=2} { set unlocked unknown }
    21  
    22  proc int2str {i} { string range [string repeat "$i." 450] 0 899 }
    23  db func int2str int2str
    24  
    25  #-------------------------------------------------------------------------
    26  #
    27  #  1.1: Write a big transaction to the db. One so large that it forces
    28  #       the file to be created and the cache flushed to disk on COMMIT.
    29  #
    30  #  1.2: Write a small transaction - one small enough that it remains in
    31  #       memory on COMMIT. All the pages of table [t1] are now dirty.
    32  #
    33  #  1.3: Delete the contents of [t1]. This moves all of its leaves to the
    34  #       free-list and causes the btree layer to call PagerDontWrite() on
    35  #       each of them.
    36  #
    37  #       Then do a big update on table [t2]. So big that the former leaves
    38  #       of [t1] are forced out of the cache. Then roll back the transaction.
    39  #       If the PagerDontWrite() calls are honoured and the data is not written
    40  #       to disk, the update made in test 1.2 will be lost at this point. Or, if
    41  #       they are ignored (as they should be for temp databases), the update
    42  #       will be safely written out to disk before the cache entries are
    43  #       discarded.
    44  #
    45  do_execsql_test 1.1 {
    46    PRAGMA page_size=1024;
    47    PRAGMA cache_size=50;
    48  
    49    BEGIN;
    50      CREATE TABLE t1(a INTEGER PRIMARY KEY, b);
    51      INSERT INTO t1 VALUES(1, int2str(1));
    52      INSERT INTO t1 VALUES(2, int2str(1));
    53      INSERT INTO t1 VALUES(3, int2str(1));
    54  
    55      CREATE TABLE t2(a INTEGER PRIMARY KEY, b);
    56      WITH c(x) AS ( VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<100 ) 
    57      INSERT INTO t2 SELECT x, int2str(x) FROM c;
    58    COMMIT;
    59  
    60    PRAGMA lock_status;
    61  } [list main $unlocked temp closed]
    62  
    63  do_execsql_test 1.2 {
    64    UPDATE t1 SET b=int2str(2);
    65    SELECT b=int2str(2) FROM t1
    66  } {1 1 1}
    67  
    68  do_execsql_test 1.3 {
    69    BEGIN;
    70      DELETE FROM t1;
    71      UPDATE t2 SET b=int2str(a+1);
    72    ROLLBACK;
    73  }
    74  
    75  do_execsql_test 1.4 {
    76    SELECT b=int2str(2) FROM t1
    77  } {1 1 1}
    78  
    79  #-------------------------------------------------------------------------
    80  db close
    81  sqlite3 db ""
    82  db func int2str int2str
    83  
    84  do_execsql_test 2.0 {
    85    PRAGMA cache_size = -100;
    86    CREATE TABLE t1(a INTEGER PRIMARY KEY, b);
    87    WITH c(x) AS ( VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<100 ) 
    88      INSERT INTO t1 SELECT x, int2str(x) FROM c;
    89  }
    90  
    91  do_execsql_test 2.1 {
    92    INSERT INTO t1 VALUES(10001, int2str(1001) || int2str(1001) || int2str(1001));
    93  }
    94  
    95  do_execsql_test 2.2 {
    96    SELECT b FROM t1 WHERE a = 10001;
    97  } "[int2str 1001][int2str 1001][int2str 1001]"
    98  
    99  finish_test