function views_join::build_join

Build the SQL for the join this object represents.

When possible, try to use table alias instead of table names.

Parameters

SelectQueryInterface $select_query: An Implements SelectQueryInterface.

string $table: The base table to join.

views_plugin_query $view_query: The source query, Implements views_plugin_query.

File

includes/handlers.inc, line 1640

Class

views_join

A function class to represent a join and create the SQL necessary to implement the join.

Code

public function build_join($select_query, $table, $view_query) {
    if (empty($this->definition['table formula'])) {
        $right_table = $this->table;
    }
    else {
        $right_table = $this->definition['table formula'];
    }
    if ($this->left_table) {
        $left = $view_query->get_table_info($this->left_table);
        $left_field = "{$left['alias']}.{$this->left_field}";
    }
    else {
        // This can be used if left_field is a formula or something. It should be
        // used only *very* rarely.
        $left_field = $this->left_field;
    }
    $condition = "{$left_field} = {$table['alias']}.{$this->field}";
    $arguments = array();
    // Tack on the extra.
    if (isset($this->extra)) {
        // If extra has been provided as string instead of an array, convert it
        // to an array.
        if (!is_array($this->extra)) {
            $this->extra = array(
                $this->extra,
            );
        }
        $extras = array();
        foreach ($this->extra as $info) {
            if (is_array($info)) {
                // Figure out the table name. Remember, only use aliases provided if
                // at all possible.
                $join_table = '';
                if (!array_key_exists('table', $info)) {
                    $join_table = $table['alias'] . '.';
                }
                elseif (isset($info['table'])) {
                    // If we're aware of a table alias for this table, use the table
                    // alias instead of the table name.
                    if (isset($left) && $left['table'] == $info['table']) {
                        $join_table = $left['alias'] . '.';
                    }
                    else {
                        $join_table = $info['table'] . '.';
                    }
                }
                // Convert a single-valued array of values to the single-value case,
                // and transform from IN() notation to = notation.
                if (is_array($info['value']) && count($info['value']) == 1) {
                    if (empty($info['operator'])) {
                        $operator = '=';
                    }
                    else {
                        $operator = $info['operator'] == 'NOT IN' ? '!=' : '=';
                    }
                    $info['value'] = array_shift($info['value']);
                }
                if (is_array($info['value'])) {
                    $value_placeholders = array();
                    // With an array of values, we need multiple placeholders and the
                    // 'IN' operator is implicit.
                    foreach ($info['value'] as $value) {
                        $placeholder_i = $view_query->placeholder('views_join_condition_');
                        $value_placeholders[] = $placeholder_i;
                        $arguments[$placeholder_i] = $value;
                    }
                    $operator = !empty($info['operator']) ? $info['operator'] : 'IN';
                    $placeholder = '( ' . implode(', ', $value_placeholders) . ' )';
                }
                else {
                    // With a single value, the '=' operator is implicit.
                    $operator = !empty($info['operator']) ? $info['operator'] : '=';
                    $placeholder = $view_query->placeholder('views_join_condition_');
                    $arguments[$placeholder] = $info['value'];
                }
                $extras[] = "{$join_table}{$info['field']} {$operator} {$placeholder}";
            }
            elseif (is_string($info)) {
                $extras[] = $info;
            }
        }
        if ($extras) {
            if (count($extras) == 1) {
                $condition .= ' AND (' . array_shift($extras) . ')';
            }
            else {
                $condition .= ' AND (' . implode(' ' . $this->extra_type . ' ', $extras) . ')';
            }
        }
    }
    $select_query->addJoin($this->type, $right_table, $table['alias'], $condition, $arguments);
}