/ 
SQL-OOP-0.21
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/ SQL::OOP::Select

NAME

SQL::OOP::Select

SYNOPSIS

my $where = SQL::OOP::Where->new();
my $select = SQL::OOP::Select->new();

# set clause by plain text
$select->set(
    $select->ARG_FIELDS => '*',
    $select->ARG_FROM   => 'some_table',
    $select->ARG_WHERE  => q("some_filed" > 5)
    $select->ARG_GROUPBY   => 'some_field',
    $select->ARG_ORDERBY   => 'some_field ASC',
    $select->ARG_LIMIT     => '10',
    $select->ARG_OFFSET    => '2',
);

# reset clauses using objects
my $where = SQL::OOP::Where->new();
$select->set(
    $select->ARG_FIELDS => SQL::OOP::ID->new('some_field'),
    $select->ARG_FROM   => SQL::OOP::ID->new('some_table'),
    $select->ARG_WHERE  => $where->cmp('=', "some_fileld", 'value')
    $select->ARG_ORDERBY=> SQL::OOP::Order->new('a', 'b'),
);

# clause can treats subs so that temporary variables don't mess around
$select->set(
    $select->ARG_FIELDS => '*',
    $select->ARG_FROM   => 'some_table',
    $select->ARG_WHERE  => sub {
        my $where = SQL::OOP::Where->new();
        return $where->cmp('=', "some_fileld", 'value');
    }
);

# SQL::OOP::Select can be part of any SQL::OOP::Base sub classes
my $select2 = SQL::OOP::Select->new();
$select2->set(
    $select2->ARG_FIELDS => q("col1", "col2"),
    $select2->ARG_FROM   => $select,
);

my $where = SQL::OOP::Where->new();
$where->cmp('=', q{some_field}, $select); # some_filed = (SELECT ..)

my $sql  = $select->to_string;
my @bind = $select->bind;

DESCRIPTION

SQL::OOP::Select class represents Select commands.

SQL::OOP::Select->new(%clause)

Constructor. It takes arguments in hash. The Hash keys are provided by following methods. They can be called as either class or instance method.

ARG_FIELDS
ARG_FROM
ARG_WHERE
ARG_GROUPBY
ARG_ORDERBY
ARG_LIMIT
ARG_OFFSET

$instance->set(%clause)

This method resets the clause data. It takes same argument as SQL::OOP::Select->new().

$instance->to_string

Get SQL snippet in string

$instance->bind

Get binded values in array

CONSTANTS

KEYS

PREFIXES

ARG_FIELDS

argument key for FIELDS(=1)

ARG_FROM

argument key for FROM clause(=2)

ARG_WHERE

argument key for WHERE clause(=3)

ARG_GROUPBY

argument key for GROUP BY clause(=4)

ARG_ORDERBY

argument key for ORDER BY clause(=5)

ARG_LIMIT

argument key for LIMIT clause(=6)

ARG_OFFSET

argument key for OFFSET clause(=7)

EXAMPLE

Here is a comprehensive example for SELECT. You also can find some examples in test scripts.

my $select = SQL::OOP::Select->new();
$select->set(
    $select->ARG_FIELDS => '*',
    $select->ARG_FROM   => 'table',
    $select->ARG_WHERE  => sub {
        my $where = SQL::OOP::Where->new;
        return $where->and(
            $where->cmp('=', 'a', 1),
            $where->cmp('=', 'b', 1),
        )
    },
);

SEE ALSO