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<?php
/**
* @ingroup database
* @{
*/
/**
* @file
* Query code for PostgreSQL embedded database engine.
*/
class InsertQuery_pgsql extends InsertQuery {
public function execute() {
if (!$this->preExecute()) {
return NULL;
}
$stmt = $this->connection->prepareQuery((string) $this);
// Fetch the list of blobs and sequences used on that table.
$table_information = $this->connection->schema()->queryTableInformation($this->table);
$max_placeholder = 0;
$blobs = array();
$blob_count = 0;
foreach ($this->insertValues as $insert_values) {
foreach ($this->insertFields as $idx => $field) {
if (isset($table_information->blob_fields[$field])) {
$blobs[$blob_count] = fopen('php://memory', 'a');
fwrite($blobs[$blob_count], $insert_values[$idx]);
rewind($blobs[$blob_count]);
$stmt->bindParam(':db_insert_placeholder_' . $max_placeholder++, $blobs[$blob_count], PDO::PARAM_LOB);
// Pre-increment is faster in PHP than increment.
++$blob_count;
}
else {
$stmt->bindParam(':db_insert_placeholder_' . $max_placeholder++, $insert_values[$idx]);
}
}
// Check if values for a serial field has been passed.
if (!empty($table_information->serial_fields)) {
foreach ($table_information->serial_fields as $index => $serial_field) {
$serial_key = array_search($serial_field, $this->insertFields);
if ($serial_key !== FALSE) {
$serial_value = $insert_values[$serial_key];
// Force $last_insert_id to the specified value. This is only done
// if $index is 0.
if ($index == 0) {
$last_insert_id = $serial_value;
}
// Set the sequence to the bigger value of either the passed
// value or the max value of the column. It can happen that another
// thread calls nextval() which could lead to a serial number being
// used twice. However, trying to insert a value into a serial
// column should only be done in very rare cases and is not thread
// safe by definition.
$this->connection->query("SELECT setval('" . $table_information->sequences[$index] . "', GREATEST(MAX(" . $serial_field . "), :serial_value)) FROM {" . $this->table . "}", array(':serial_value' => (int)$serial_value));
}
}
}
}
if (!empty($this->fromQuery)) {
// bindParam stores only a reference to the variable that is followed when
// the statement is executed. We pass $arguments[$key] instead of $value
// because the second argument to bindParam is passed by reference and
// the foreach statement assigns the element to the existing reference.
$arguments = $this->fromQuery->getArguments();
foreach ($arguments as $key => $value) {
$stmt->bindParam($key, $arguments[$key]);
}
}
// PostgreSQL requires the table name to be specified explicitly
// when requesting the last insert ID, so we pass that in via
// the options array.
$options = $this->queryOptions;
if (!empty($table_information->sequences)) {
$options['sequence_name'] = $table_information->sequences[0];
}
// If there are no sequences then we can't get a last insert id.
elseif ($options['return'] == Database::RETURN_INSERT_ID) {
$options['return'] = Database::RETURN_NULL;
}
// Only use the returned last_insert_id if it is not already set.
if (!empty($last_insert_id)) {
$this->connection->query($stmt, array(), $options);
}
else {
$last_insert_id = $this->connection->query($stmt, array(), $options);
}
// Re-initialize the values array so that we can re-use this query.
$this->insertValues = array();
return $last_insert_id;
}
public function __toString() {
// Create a comments string to prepend to the query.
$comments = (!empty($this->comments)) ? '/* ' . implode('; ', $this->comments) . ' */ ' : '';
// Default fields are always placed first for consistency.
$insert_fields = array_merge($this->defaultFields, $this->insertFields);
// If we're selecting from a SelectQuery, finish building the query and
// pass it back, as any remaining options are irrelevant.
if (!empty($this->fromQuery)) {
return $comments . 'INSERT INTO {' . $this->table . '} (' . implode(', ', $insert_fields) . ') ' . $this->fromQuery;
}
$query = $comments . 'INSERT INTO {' . $this->table . '} (' . implode(', ', $insert_fields) . ') VALUES ';
$max_placeholder = 0;
$values = array();
if (count($this->insertValues)) {
foreach ($this->insertValues as $insert_values) {
$placeholders = array();
// Default fields aren't really placeholders, but this is the most convenient
// way to handle them.
$placeholders = array_pad($placeholders, count($this->defaultFields), 'default');
$new_placeholder = $max_placeholder + count($insert_values);
for ($i = $max_placeholder; $i < $new_placeholder; ++$i) {
$placeholders[] = ':db_insert_placeholder_' . $i;
}
$max_placeholder = $new_placeholder;
$values[] = '(' . implode(', ', $placeholders) . ')';
}
}
else {
// If there are no values, then this is a default-only query. We still need to handle that.
$placeholders = array_fill(0, count($this->defaultFields), 'default');
$values[] = '(' . implode(', ', $placeholders) . ')';
}
$query .= implode(', ', $values);
return $query;
}
}
class UpdateQuery_pgsql extends UpdateQuery {
public function execute() {
$max_placeholder = 0;
$blobs = array();
$blob_count = 0;
// Because we filter $fields the same way here and in __toString(), the
// placeholders will all match up properly.
$stmt = $this->connection->prepareQuery((string) $this);
// Fetch the list of blobs and sequences used on that table.
$table_information = $this->connection->schema()->queryTableInformation($this->table);
// Expressions take priority over literal fields, so we process those first
// and remove any literal fields that conflict.
$fields = $this->fields;
$expression_fields = array();
foreach ($this->expressionFields as $field => $data) {
if (!empty($data['arguments'])) {
foreach ($data['arguments'] as $placeholder => $argument) {
// We assume that an expression will never happen on a BLOB field,
// which is a fairly safe assumption to make since in most cases
// it would be an invalid query anyway.
$stmt->bindParam($placeholder, $data['arguments'][$placeholder]);
}
}
unset($fields[$field]);
}
foreach ($fields as $field => $value) {
$placeholder = ':db_update_placeholder_' . ($max_placeholder++);
if (isset($table_information->blob_fields[$field])) {
$blobs[$blob_count] = fopen('php://memory', 'a');
fwrite($blobs[$blob_count], $value);
rewind($blobs[$blob_count]);
$stmt->bindParam($placeholder, $blobs[$blob_count], PDO::PARAM_LOB);
++$blob_count;
}
else {
$stmt->bindParam($placeholder, $fields[$field]);
}
}
if (count($this->condition)) {
$this->condition->compile($this->connection, $this);
$arguments = $this->condition->arguments();
foreach ($arguments as $placeholder => $value) {
$stmt->bindParam($placeholder, $arguments[$placeholder]);
}
}
$options = $this->queryOptions;
$options['already_prepared'] = TRUE;
$this->connection->query($stmt, $options);
return $stmt->rowCount();
}
}
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