modernc.org/cc@v1.0.1/v2/testdata/_sqlite/test/shared8.test (about)

     1  # 2012 May 15
     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 are intended to show that closing one database
    13  # connection to a shared-cache while there exist other connections (a)
    14  # does not cause the schema to be reloaded and (b) does not cause any
    15  # other problems.
    16  #
    17  
    18  set testdir [file dirname $argv0]
    19  source $testdir/tester.tcl
    20  ifcapable !shared_cache { finish_test ; return }
    21  set testprefix shared8
    22  
    23  db close
    24  set ::enable_shared_cache [sqlite3_enable_shared_cache 1]
    25  do_test 0.0 { sqlite3_enable_shared_cache } {1}
    26  
    27  proc roman {n} {
    28    array set R {1 i 2 ii 3 iii 4 iv 5 v 6 vi 7 vii 8 viii 9 ix 10 x}
    29    set R($n)
    30  }
    31  
    32  #-------------------------------------------------------------------------
    33  # The following tests work as follows:
    34  #
    35  #    1.0: Open connection [db1] and populate the database.
    36  #
    37  #    1.1: Using "PRAGMA writable_schema", destroy the database schema on
    38  #         disk. The schema is still in memory, so it is possible to keep
    39  #         using it, but any attempt to reload it from disk will fail.
    40  #
    41  #    1.3-4: Open connection db2. Check that it can see the db schema. Then
    42  #           close db1 and check that db2 still works. This shows that closing
    43  #           db1 did not reset the in-memory schema.
    44  #
    45  #    1.5-7: Similar to 1.3-4.
    46  #
    47  #    1.8: Close all database connections (deleting the in-memory schema).
    48  #         Then open a new connection and check that it cannot read the db.
    49  #         
    50  do_test 1.0 {
    51    sqlite3 db1 test.db
    52    db1 func roman roman
    53    execsql {
    54      CREATE TABLE t1(a, b);
    55      INSERT INTO t1 VALUES(1, 1);
    56      INSERT INTO t1 VALUES(2, 2);
    57      INSERT INTO t1 VALUES(3, 3);
    58      INSERT INTO t1 VALUES(4, 4);
    59      CREATE VIEW v1 AS SELECT a, roman(b) FROM t1;
    60      SELECT * FROM v1;
    61    } db1
    62  } {1 i 2 ii 3 iii 4 iv}
    63  
    64  do_test 1.1 {
    65    execsql { 
    66      PRAGMA writable_schema = 1;
    67      DELETE FROM sqlite_master WHERE 1;
    68      PRAGMA writable_schema = 0;
    69      SELECT * FROM sqlite_master;
    70    } db1
    71  } {}
    72  
    73  do_test 1.2 {
    74    execsql { SELECT * FROM v1 } db1
    75  } {1 i 2 ii 3 iii 4 iv}
    76  
    77  do_test 1.3 {
    78    sqlite3 db2 test.db
    79    db2 func roman roman
    80    execsql { SELECT * FROM v1 } db2
    81  } {1 i 2 ii 3 iii 4 iv}
    82  
    83  do_test 1.4 {
    84    db1 close
    85    execsql { SELECT * FROM v1 } db2
    86  } {1 i 2 ii 3 iii 4 iv}
    87  
    88  do_test 1.5 {
    89    sqlite3 db3 test.db
    90    db3 func roman roman
    91    execsql { SELECT * FROM v1 } db3
    92  } {1 i 2 ii 3 iii 4 iv}
    93  
    94  do_test 1.6 {
    95    execsql { SELECT * FROM v1 } db2
    96  } {1 i 2 ii 3 iii 4 iv}
    97  
    98  do_test 1.7 {
    99    db2 close
   100    execsql { SELECT * FROM v1 } db3
   101  } {1 i 2 ii 3 iii 4 iv}
   102  
   103  do_test 1.8 {
   104    db3 close
   105    sqlite3 db4 test.db
   106    catchsql { SELECT * FROM v1 } db4
   107  } {1 {no such table: v1}}
   108  
   109  
   110  foreach db {db1 db2 db3 db4} { catch { $db close } }
   111  sqlite3_enable_shared_cache $::enable_shared_cache
   112  finish_test