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Manual Reference Pages  -  TEST::DATABASEROW (3)

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NAME

Test::DatabaseRow - simple database tests

CONTENTS

SYNOPSIS



  use Test::More tests => 3;
  use Test::DatabaseRow;

  # set the default database handle
  local $Test::DatabaseRow::dbh = $dbh;

  # sql based test
  all_row_ok(
    sql   => "SELECT * FROM contacts WHERE cid = 123",
    tests => [ name => "trelane" ],
    description => "contact 123s name is trelane"
  );

  # test with shortcuts
  all_row_ok(
    table => "contacts",
    where => [ cid => 123 ],
    tests => [ name => "trelane" ],
    description => "contact 123s name is trelane"
  );

  # complex test
  all_row_ok(
    table => "contacts",
    where => { =    => { name   => "trelane"            },
               like => { url    => %shortplanks.com   },},
    tests => { ==   => { cid    => 123,
                           num    => 134                  },
               eq   => { person => "Mark Fowler"        },
               =~   => { road   => qr/Liverpool R.?.?d/ },},
    description => "trelane entered into contacts okay" );
  );



DESCRIPTION

This is a simple module for doing simple tests on a database, primarily designed to test if a row exists with the correct details in a table or not.

This module exports several functions.

    row_ok

The row_ok function takes named attributes that control which rows in which table it selects, and what tests are carried out on those rows.

By default it performs the tests against only the first row returned from the database, but parameters passed to it can alter that behavior.
dbh The database handle that the test should use. In lieu of this attribute being passed the test will use whatever handle is set in the $Test::DatabaseRow::dbh global variable.
sql Manually specify the SQL to select the rows you want this module to execute.

This can either be just a plain string, or it can be an array ref with the first element containing the SQL string and any further elements containing bind variables that will be used to fill in placeholders.



  # using the plain string version
  row_ok(sql   => "SELECT * FROM contacts WHERE cid = 123",
         tests => [ name => "Trelane" ]);

  # using placeholders and bind variables
  row_ok(sql   => [ "SELECT * FROM contacts WHERE cid = ?", 123 ],
         tests => [ name => "Trelane" ]);



table Build the SELECT statement programmatically. This parameter contains the name of the table the SELECT statement should be executed against. You cannot pass both a table parameter and a sql parameter. If you specify table you <B>mustB> pass a where parameter also (see below.)
where Build the SELECT statement programmatically. This parameter should contain options that will combine into a WHERE clause in order to select the row that you want to test.

This options normally are a hash of hashes. It’s a hashref keyed by SQL comparison operators that has in turn values that are further hashrefs of column name and values pairs. This sounds really complicated, but is quite simple once you’ve been shown an example. If we could get get the data to test with a SQL like so:



  SELECT *
    FROM tablename
   WHERE foo  =    bar
     AND baz  =     23
     AND fred LIKE wilma%
     AND age  >=    18



Then we could have the function build that SQL like so:



  row_ok(table => "tablename",
         where => { =    => { foo  => "bar",
                                baz  => 23,       },
                    LIKE => { fred => wimla%, },
                    >=   => { age  => 18,     },});



Note how each different type of comparison has it’s own little hashref containing the column name and the value for that column that the associated operator SQL should search for.

This syntax is quite flexible, but can be overkill for simple tests. In order to make this simpler, if you are only using ’=’ tests you may just pass an arrayref of the column names / values. For example, just to test



  SELECT *
    FROM tablename
   WHERE foo = bar
     AND baz = 23;



You can simply pass



  row_ok(table => "tablename",
         where => [ foo  => "bar",
                    baz  => 23,    ]);



Which, in a lot of cases, makes things a lot quicker and simpler to write.

NULL values can confuse things in SQL. All you need to remember is that when building SQL statements use undef whenever you want to use a NULL value. Don’t use the string NULL as that’ll be interpreted as the literal string made up of a N, a U and two Ls.

As a special case, using undef either in a = or in the short arrayref form will cause a IS test to be used instead of a = test. This means the statements:



  row_ok(table => "tablename",
         where => [ foo  => undef ],)



Will produce:



  SELECT *
    FROM tablename
   WHERE foo IS NULL



tests The comparisons that you want to run between the expected data and the data in the first line returned from the database. If you do not specify any tests then the test will simply check if any rows are returned from the database and will pass no matter what they actually contain.

Normally this is a hash of hashes in a similar vein to where. This time the outer hash is keyed by Perl comparison operators, and the inner hashes contain column names and the expected values for these columns. For example:



  row_ok(sql   => $sql,
         tests => { "eq" => { wibble => "wobble",
                              fish   => "fosh",    },
                    "==" => { bob    => 4077       },
                    "=~" => { fred   => qr/barney/ },},);



This checks that the column wibble is the string wobble, column fish is the string fosh, column bob is equal numerically to 4077, and that fred contains the text barney. You may use any infix comparison operator (e.g. <, >, &&, etc, etc) as a test key.

The first comparison to fail (to return false) will cause the whole test to fail, and debug information will be printed out on that comparison.

In a similar fashion to where you can also pass a arrayref for simple comparisons. The function will try and Do The Right Thing with regard to the expected value for that comparison. Any expected value that looks like a number will be compared numerically, a regular expression will be compared with the =~ operator, and anything else will undergo string comparison. The above example therefore could be rewritten:



  row_ok(sql   => $sql,
         tests => [ wibble => "wobble",
                    fish   => "fosh",
                    bob    => 4077,
                    fred   => qr/barney/ ]);



check_all_rows Setting this to a true value causes row_ok to run the tests against all rows returned from the database not just the first.
verbose Setting this option to a true value will cause verbose diagnostics to be printed out during any failing tests. You may also enable this feature by setting either $Test::DatabaseRow::verbose variable or the TEST_DBROW_VERBOSE environmental variable to a true value.
verbose_data Setting this option to a true value will cause the results of running the SQL queries to be printed out during any failing tests. You may also enable this feature by setting either $Test::DatabaseRow::verbose_data variable or the TEST_DBROW_VERBOSE_DATA environmental variable to a true value.
store_rows Sometimes, it’s not enough to just use the simple tests that <B>Test::DatabaseRowB> offers you. In this situation you can use the store_rows function to get at the results that row_ok has extracted from the database. You should pass a reference to an array for the results to be stored in; After the call to row_ok this array will be populated with one hashref per row returned from the database, keyed by column names.



  row_ok(sql => "SELECT * FROM contact WHERE name = Trelane",
         store_rows => \@rows);

  ok(Email::Valid->address($rows[0]{email}));



store_row The same as store_rows, but only the stores the first row returned in the variable. Instead of passing in an array reference you should pass in either a reference to a hash...



  row_ok(sql => "SELECT * FROM contact WHERE name = Trelane",
         store_rows => \%row);

  ok(Email::Valid->address($row{email}));



...or a reference to a scalar which should be populated with a hashref...



  row_ok(sql => "SELECT * FROM contact WHERE name = Trelane",
         store_rows => \$row);

  ok(Email::Valid->address($row->{email}));



description The description that this test will use with Test::Builder, i.e the thing that will be printed out after ok/not ok. For example:



  row_ok(
    sql => "SELECT * FROM queue",
    description => "something in the queue"
  );



Hopefully produces something like:



  ok 1 - something in the queue



For historical reasons you may also pass label for this parameter.

    Checking the number of results

By default row_ok just checks the first row returned from the database matches the criteria passed. By setting the parameters below you can also cause the module to check that the correct number of rows are returned from by the select statement (though only the first row will be tested against the test conditions.)
results Setting this parameter causes the test to ensure that the database returns exactly this number of rows when the select statement is executed. Setting this to zero allows you to ensure that no matching rows were found by the database, hence this parameter can be used for negative assertions about the database.



  # assert that Trelane is _not_ in the database
  row_ok(sql     => "SELECT * FROM contacts WHERE name = Trelane",
         results => 0 );

  # convenience function that does the same thing
  not_row_ok(sql => "SELECT * FROM contacts WHERE name = Trelane")



min_results / max_results This parameter allows you to test that the database returns at least or no more than the passed number of rows when the select statement is executed.

    Convenience Functions

This module also exports a few convenience functions that make using certain features of row_ok more straight forward.
all_row_ok The all_row_ok function is shorthand notation for Check every row returned from the database not just the first

For example:



  all_row_ok(tests => { ">=" => { age => "18" } }, sql => <<SQL);
    SELECT *
      FROM drinkers
     WHERE country = uk
  SQL



Checks to see that all drinkers from the UK are over 18. It’s identical to having written:



  row_ok(tests => { ">=" => { age => "18" } },
         check_all_rows => 1, sql => <<SQL);
    SELECT *
      FROM drinkers
     WHERE country = uk
  SQL



not_row_ok The not_row_ok function is shorthand notation for the database returned no rows when I executed this SQL.

For example:



  not_row_ok(sql => <<SQL);
    SELECT *
      FROM languages
     WHERE name = Java
  SQL



Checks to see the database doesn’t have any rows in the language table that have a name Java. It’s exactly the same as if we’d written:



  row_ok(sql => <<SQL, results => 0);
    SELECT *
      FROM languages
     WHERE name = Java
  SQL



    Other SQL modules

The SQL creation routines that are part of this module are designed primarily with the concept of getting simple single rows out of the database with as little fuss as possible. This having been said, it’s quite possible that you need to use a more complicated SQL generation scheme than the one provided.

This module is designed to work (hopefully) reasonably well with the other modules on CPAN that can automatically create SQL for you. For example, <B>SQL::AbstractB> is a module that can manufacture much more complex select statements that can easily be ’tied in’ to row_ok:



  use SQL::Abstract;
  use Test::DatabaseRow;
  my $sql = SQL::Abstract->new();

  # more complex routine to find me heuristically by looking
  # for any one of my nicknames and my street address
  row_ok(sql   => [ $sql->select("contacts",
                                 "*",
                                 { name => [ "Trelane",
                                             "Trel",
                                             "MarkF" ],
                                   road => { like => "Liverpool%" },
                                 })],
         tests => [ email => mark@twoshortplanks.com ],
         description => "check marks email address");



    utf8 hacks

Often, you may store data utf8 data in your database. However, many modern databases still do not store the metadata to indicate the data stored in them is utf8 and their DBD drivers may not set the utf8 flag on values returned to Perl. This means that data returned to Perl will be treated as if it is encoded in your normal character set rather than being encoded in utf8 and when compared to a byte for byte an identical utf8 string may fail comparison.



    # this will fail incorrectly on data coming back from
    # mysql since the utf8 flags wont be set on returning data
    use utf8;
    row_ok(sql   => $sql,
           tests => [ name => "Napol\x{e9}on" ]);



The solution to this is to use Encode::_utf_on($value) on each value returned from the database, something you will have to do yourself in your application code. To get this module to do this for you you can either pass the force_utf8 flag to row_ok.



    use utf8;
    row_ok(sql        => $sql,
           tests      => [ name => "Napol\x{e9}on" ],
           force_utf8 => 1);



Or set the global $Test::DatabaseRow::force_utf8 variable



   use utf8;
   local $Test::DatabaseRow::force_utf8 = 1;
   row_ok(sql        => $sql,
          tests      => [ name => "Napol\x{e9}on" ]);



Please note that in the above examples with use utf8 enabled I could have typed Unicode eacutes into the string directly rather than using the \x{e9} escape sequence, but alas the pod renderer you’re using to view this documentation would have been unlikely to render those examples correctly, so I didn’t.

Please also note that if you want the debug information that this module creates to be rendered to STDERR correctly for your utf8 terminal then you may need to stick



   binmode STDERR, ":utf8";



At the top of your script.

    Using a custom object subclass

This procedural wrapper relies on the base functionality of Test::DatabaseRow::Object to do the actual work. If you want to subclass that class (for example to use an alternative method of accessing the database) but continue to use this wrapper class you can do so by setting the $Test::DatabaseRow::object_class variable.

For example:



   local $Test::DatabaseRow::object_class =
     "Test::DatabaseRow::Object::MyFunnySubclassOrOther";
   row_ok(
     sql => "SELECT * FROM qa WHERE a = 42",
   );



BUGS

You must pass a sql or where argument to limit what is returned from the table. The case where you don’t want to is so unlikely (and it’s much more likely that you’ve written a bug in your test script) that omitting both of these is treated as an error. If you really need to not pass a sql or where argument, do where => [ 1 => 1 ].

Passing shared variables (variables shared between multiple threads with <B>threads::sharedB>) in with store_row and store_rows and then changing them while row_ok is still executing is just asking for trouble.

The utf8 stuff only really works with perl 5.8 and later. It just goes horribly wrong on earlier perls. There’s nothing I can do to correct that. Also, no matter what version of Perl you’re running, currently no way provided by this module to force the utf8 flag to be turned on for some fields and not on for others.

The inbuilt SQL builder always assumes you mean IS NULL not = NULL when you pass in undef in a = section

Bugs (and requests for new features) can be reported though the CPAN RT system: <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Test-DatabaseRow>

Alternatively, you can simply fork this project on github and send me pull requests. Please see <http://github.com/2shortplanks/Test-DatabaseRow>

AUTHOR

Written by Mark Fowler mark@twoshortplanks.com

Copyright Profero 2003, 2004. Copyright Mark Fowler 2011.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

SEE ALSO

Test::DatabaseRow::Object, Test::More, DBI
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perl v5.20.3 TEST::DATABASEROW (3) 2014-07-06

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