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