gitlab.com/CoiaPrant/sqlite3@v1.19.1/testdata/tcl/snapshot4.test (about)

     1  # 2018 August 28
     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 focus
    12  # of this file is the sqlite3_snapshot_xxx() APIs.
    13  #
    14  
    15  set testdir [file dirname $argv0]
    16  source $testdir/tester.tcl
    17  ifcapable !snapshot {finish_test; return}
    18  set testprefix snapshot4
    19  
    20  # This test does not work with the inmemory_journal permutation. The reason
    21  # is that each connection opened as part of this permutation executes
    22  # "PRAGMA journal_mode=memory", which fails if the database is in wal mode
    23  # and there are one or more existing connections.
    24  if {[permutation]=="inmemory_journal"} {
    25    finish_test
    26    return
    27  }
    28  
    29  sqlite3 db2 test.db
    30  
    31  do_execsql_test 1.0 {
    32    PRAGMA cache_size = 10;
    33    CREATE TABLE t1(a, b);
    34    INSERT INTO t1 VALUES(1, randomblob(400));
    35    PRAGMA journal_mode = wal;
    36    WITH s(i) AS (
    37      SELECT 2 UNION ALL SELECT i+1 FROM s WHERE i<100
    38    ) 
    39    INSERT INTO t1 SELECT i, randomblob(400) FROM s;
    40  } {wal}
    41  
    42  do_test 1.1 {
    43    execsql {
    44      BEGIN;
    45        SELECT count(*) FROM t1;
    46    }
    47  } {100}
    48  
    49  do_test 1.2 {
    50    db2 eval { 
    51      SELECT count(*) FROM t1;
    52      CREATE TABLE t2(x); 
    53    }
    54  } {100}
    55  
    56  do_test 1.3 {
    57    set ::snap [sqlite3_snapshot_get_blob db main]
    58    db2 eval { PRAGMA wal_checkpoint }
    59  } {0 54 52}
    60  
    61  do_test 1.4 {
    62    execsql {
    63      COMMIT;
    64      SELECT * FROM sqlite_master;
    65      BEGIN;
    66    }
    67    sqlite3_snapshot_open_blob db main $::snap
    68    execsql {
    69      SELECT count(*) FROM t1
    70    } 
    71  } {100}
    72  
    73  
    74  finish_test