533 lines
19 KiB
PHP
533 lines
19 KiB
PHP
<?php
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// $Id$
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/**
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* @file
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* Database schema code for PostgreSQL database servers.
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*/
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/**
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* @ingroup schemaapi
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* @{
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*/
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class DatabaseSchema_pgsql extends DatabaseSchema {
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/**
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* A cache of information about blob columns and sequences of tables.
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*
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* This is collected by DatabaseConnection_pgsql->queryTableInformation(),
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* by introspecting the database.
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*
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* @see DatabaseConnection_pgsql->queryTableInformation()
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* @var array
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*/
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protected $tableInformation = array();
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/**
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* Fetch the list of blobs and sequences used on a table.
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*
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* We introspect the database to collect the information required by insert
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* and update queries.
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*
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* @param $table_name
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* The non-prefixed name of the table.
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* @return
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* An object with two member variables:
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* - 'blob_fields' that lists all the blob fields in the table.
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* - 'sequences' that lists the sequences used in that table.
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*/
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public function queryTableInformation($table) {
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// Generate a key to reference this table's information on.
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$key = $this->connection->prefixTables('{' . $table . '}');
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if (!strpos($key, '.')) {
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$key = 'public.' . $key;
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}
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if (!isset($this->tableInformation[$key])) {
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// Split the key into schema and table for querying.
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list($schema, $table_name) = explode('.', $key);
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$table_information = (object) array(
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'blob_fields' => array(),
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'sequences' => array(),
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);
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// Don't use {} around information_schema.columns table.
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$result = $this->connection->query("SELECT column_name, data_type, column_default FROM information_schema.columns WHERE table_schema = :schema AND table_name = :table AND (data_type = 'bytea' OR (numeric_precision IS NOT NULL AND column_default LIKE :default))", array(
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':schema' => $schema,
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':table' => $table_name,
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':default' => '%nextval%',
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));
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foreach ($result as $column) {
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if ($column->data_type == 'bytea') {
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$table_information->blob_fields[$column->column_name] = TRUE;
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}
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elseif (preg_match("/nextval\('([^']+)'/", $column->column_default, $matches)) {
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// We must know of any sequences in the table structure to help us
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// return the last insert id. If there is more than 1 sequences the
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// first one (index 0 of the sequences array) will be used.
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$table_information->sequences[] = $matches[1];
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}
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}
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$this->tableInformation[$key] = $table_information;
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}
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return $this->tableInformation[$key];
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}
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/**
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* Generate SQL to create a new table from a Drupal schema definition.
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*
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* @param $name
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* The name of the table to create.
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* @param $table
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* A Schema API table definition array.
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* @return
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* An array of SQL statements to create the table.
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*/
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protected function createTableSql($name, $table) {
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$sql_fields = array();
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foreach ($table['fields'] as $field_name => $field) {
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$sql_fields[] = $this->createFieldSql($field_name, $this->processField($field));
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}
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$sql_keys = array();
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if (isset($table['primary key']) && is_array($table['primary key'])) {
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$sql_keys[] = 'PRIMARY KEY (' . implode(', ', $table['primary key']) . ')';
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}
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if (isset($table['unique keys']) && is_array($table['unique keys'])) {
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foreach ($table['unique keys'] as $key_name => $key) {
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$sql_keys[] = 'CONSTRAINT {' . $name . '}_' . $key_name . '_key UNIQUE (' . implode(', ', $key) . ')';
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}
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}
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$sql = "CREATE TABLE {" . $name . "} (\n\t";
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$sql .= implode(",\n\t", $sql_fields);
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if (count($sql_keys) > 0) {
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$sql .= ",\n\t";
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}
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$sql .= implode(",\n\t", $sql_keys);
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$sql .= "\n)";
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$statements[] = $sql;
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if (isset($table['indexes']) && is_array($table['indexes'])) {
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foreach ($table['indexes'] as $key_name => $key) {
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$statements[] = $this->_createIndexSql($name, $key_name, $key);
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}
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}
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// Add table comment.
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if (!empty($table['description'])) {
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$statements[] = 'COMMENT ON TABLE {' . $name . '} IS ' . $this->prepareComment($table['description']);
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}
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// Add column comments.
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foreach ($table['fields'] as $field_name => $field) {
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if (!empty($field['description'])) {
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$statements[] = 'COMMENT ON COLUMN {' . $name . '}.' . $field_name . ' IS ' . $this->prepareComment($field['description']);
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}
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}
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return $statements;
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}
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/**
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* Create an SQL string for a field to be used in table creation or
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* alteration.
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*
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* Before passing a field out of a schema definition into this
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* function it has to be processed by _db_process_field().
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*
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* @param $name
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* Name of the field.
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* @param $spec
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* The field specification, as per the schema data structure format.
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*/
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protected function createFieldSql($name, $spec) {
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$sql = $name . ' ' . $spec['pgsql_type'];
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if ($spec['type'] == 'serial') {
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unset($spec['not null']);
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}
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if (in_array($spec['type'], array('varchar', 'char', 'text')) && isset($spec['length'])) {
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$sql .= '(' . $spec['length'] . ')';
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}
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elseif (isset($spec['precision']) && isset($spec['scale'])) {
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$sql .= '(' . $spec['precision'] . ', ' . $spec['scale'] . ')';
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}
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if (!empty($spec['unsigned'])) {
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$sql .= " CHECK ($name >= 0)";
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}
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if (isset($spec['not null']) && $spec['not null']) {
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$sql .= ' NOT NULL';
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}
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if (isset($spec['default'])) {
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$default = is_string($spec['default']) ? "'" . $spec['default'] . "'" : $spec['default'];
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$sql .= " default $default";
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}
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return $sql;
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}
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/**
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* Set database-engine specific properties for a field.
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*
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* @param $field
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* A field description array, as specified in the schema documentation.
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*/
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protected function processField($field) {
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if (!isset($field['size'])) {
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$field['size'] = 'normal';
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}
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// Set the correct database-engine specific datatype.
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if (!isset($field['pgsql_type'])) {
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$map = $this->getFieldTypeMap();
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$field['pgsql_type'] = $map[$field['type'] . ':' . $field['size']];
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}
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if (!empty($field['unsigned'])) {
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// Unsigned datatypes are not supported in PostgreSQL 8.3. In MySQL,
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// they are used to ensure a positive number is inserted and it also
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// doubles the maximum integer size that can be stored in a field.
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// The PostgreSQL schema in Drupal creates a check constraint
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// to ensure that a value inserted is >= 0. To provide the extra
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// integer capacity, here, we bump up the column field size.
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if (!isset($map)) {
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$map = $this->getFieldTypeMap();
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}
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switch ($field['pgsql_type']) {
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case 'smallint':
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$field['pgsql_type'] = $map['int:medium'];
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break;
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case 'int' :
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$field['pgsql_type'] = $map['int:big'];
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break;
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}
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}
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if ($field['type'] == 'serial') {
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unset($field['not null']);
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}
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return $field;
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}
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/**
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* This maps a generic data type in combination with its data size
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* to the engine-specific data type.
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*/
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function getFieldTypeMap() {
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// Put :normal last so it gets preserved by array_flip. This makes
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// it much easier for modules (such as schema.module) to map
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// database types back into schema types.
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// $map does not use drupal_static as its value never changes.
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static $map = array(
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'varchar:normal' => 'varchar',
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'char:normal' => 'character',
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'text:tiny' => 'text',
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'text:small' => 'text',
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'text:medium' => 'text',
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'text:big' => 'text',
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'text:normal' => 'text',
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'int:tiny' => 'smallint',
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'int:small' => 'smallint',
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'int:medium' => 'int',
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'int:big' => 'bigint',
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'int:normal' => 'int',
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'float:tiny' => 'real',
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'float:small' => 'real',
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'float:medium' => 'real',
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'float:big' => 'double precision',
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'float:normal' => 'real',
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'numeric:normal' => 'numeric',
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'blob:big' => 'bytea',
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'blob:normal' => 'bytea',
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'date:normal' => 'date',
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'datetime:normal' => 'timestamp without time zone',
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'time:normal' => 'time without time zone',
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'serial:tiny' => 'serial',
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'serial:small' => 'serial',
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'serial:medium' => 'serial',
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'serial:big' => 'bigserial',
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'serial:normal' => 'serial',
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);
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return $map;
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}
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protected function _createKeySql($fields) {
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$return = array();
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foreach ($fields as $field) {
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if (is_array($field)) {
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$return[] = 'substr(' . $field[0] . ', 1, ' . $field[1] . ')';
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}
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else {
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$return[] = '"' . $field . '"';
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}
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}
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return implode(', ', $return);
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}
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function renameTable($table, $new_name) {
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if (!$this->tableExists($table)) {
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throw new DatabaseSchemaObjectDoesNotExistException(t("Cannot rename %table to %table_new: table %table doesn't exist.", array('%table' => $table, '%table_new' => $new_name)));
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}
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if ($this->tableExists($new_name)) {
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throw new DatabaseSchemaObjectExistsException(t("Cannot rename %table to %table_new: table %table_new already exists.", array('%table' => $table, '%table_new' => $new_name)));
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}
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// Get the schema and tablename for the old table.
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$old_full_name = $this->connection->prefixTables('{' . $table . '}');
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list($old_schema, $old_table_name) = strpos($old_full_name, '.') ? explode('.', $old_full_name) : array('public', $old_full_name);
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// Index names and constraint names are global in PostgreSQL, so we need to
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// rename them when renaming the table.
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$indexes = $this->connection->query('SELECT indexname FROM pg_indexes WHERE schemaname = :schema AND tablename = :table', array(':schema' => $old_schema, ':table' => $old_table_name));
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foreach ($indexes as $index) {
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if (preg_match('/^' . preg_quote($old_full_name) . '_(.*)_idx$/', $index->indexname, $matches)) {
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$index_name = $matches[1];
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$this->connection->query('ALTER INDEX ' . $index->indexname . ' RENAME TO {' . $new_name . '}_' . $index_name . '_idx');
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}
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}
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// Now rename the table.
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$this->connection->query('ALTER TABLE {' . $table . '} RENAME TO {' . $new_name . '}');
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}
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public function dropTable($table) {
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if (!$this->tableExists($table)) {
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return FALSE;
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}
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$this->connection->query('DROP TABLE {' . $table . '}');
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return TRUE;
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}
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public function addField($table, $field, $spec, $new_keys = array()) {
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if (!$this->tableExists($table)) {
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throw new DatabaseSchemaObjectDoesNotExistException(t("Cannot add field %table.%field: table doesn't exist.", array('%field' => $field, '%table' => $table)));
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}
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if ($this->columnExists($table, $field)) {
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throw new DatabaseSchemaObjectExistsException(t("Cannot add field %table.%field: field already exists.", array('%field' => $field, '%table' => $table)));
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}
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$fixnull = FALSE;
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if (!empty($spec['not null']) && !isset($spec['default'])) {
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$fixnull = TRUE;
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$spec['not null'] = FALSE;
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}
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$query = 'ALTER TABLE {' . $table . '} ADD COLUMN ';
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$query .= $this->createFieldSql($field, $this->processField($spec));
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$this->connection->query($query);
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if (isset($spec['initial'])) {
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$this->connection->update($table)
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->fields(array($field, $spec['initial']))
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->execute();
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}
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if ($fixnull) {
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$this->connection->query("ALTER TABLE {" . $table . "} ALTER $field SET NOT NULL");
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}
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if (isset($new_keys)) {
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$this->_createKeys($table, $new_keys);
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}
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// Add column comment.
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if (!empty($spec['description'])) {
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$this->connection->query('COMMENT ON COLUMN {' . $table . '}.' . $field . ' IS ' . $this->prepareComment($spec['description']));
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}
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}
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public function dropField($table, $field) {
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if (!$this->columnExists($table, $field)) {
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return FALSE;
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}
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$this->connection->query('ALTER TABLE {' . $table . '} DROP COLUMN "' . $field . '"');
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return TRUE;
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}
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public function fieldSetDefault($table, $field, $default) {
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if (!$this->columnExists($table, $field)) {
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throw new DatabaseSchemaObjectDoesNotExistException(t("Cannot set default value of field %table.%field: field doesn't exist.", array('%table' => $table, '%field' => $field)));
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}
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if (is_null($default)) {
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$default = 'NULL';
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}
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else {
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$default = is_string($default) ? "'$default'" : $default;
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}
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$this->connection->query('ALTER TABLE {' . $table . '} ALTER COLUMN "' . $field . '" SET DEFAULT ' . $default);
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}
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public function fieldSetNoDefault($table, $field) {
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if (!$this->columnExists($table, $field)) {
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throw new DatabaseSchemaObjectDoesNotExistException(t("Cannot remove default value of field %table.%field: field doesn't exist.", array('%table' => $table, '%field' => $field)));
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}
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$this->connection->query('ALTER TABLE {' . $table . '} ALTER COLUMN "' . $field . '" DROP DEFAULT');
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}
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public function indexExists($table, $name) {
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// Details http://www.postgresql.org/docs/8.3/interactive/view-pg-indexes.html
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$index_name = '{' . $table . '}_' . $name . '_idx';
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return (bool) $this->connection->query("SELECT 1 FROM pg_indexes WHERE indexname = '$index_name'")->fetchField();
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}
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/**
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* Helper function: check if a constraint (PK, FK, UK) exists.
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*
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* @param $table
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* The name of the table.
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* @param $name
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* The name of the constraint (typically 'pkey' or '[constraint]_key').
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*/
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protected function constraintExists($table, $name) {
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$constraint_name = '{' . $table . '}_' . $name;
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return (bool) $this->connection->query("SELECT 1 FROM pg_constraint WHERE conname = '$constraint_name'")->fetchField();
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}
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public function addPrimaryKey($table, $fields) {
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if (!$this->tableExists($table)) {
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throw new DatabaseSchemaObjectDoesNotExistException(t("Cannot add primary key to table %table: table doesn't exist.", array('%table' => $table)));
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}
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if ($this->constraintExists($table, 'pkey')) {
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throw new DatabaseSchemaObjectExistsException(t("Cannot add primary key to table %table: primary key already exists.", array('%table' => $table)));
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}
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$this->connection->query('ALTER TABLE {' . $table . '} ADD PRIMARY KEY (' . implode(',', $fields) . ')');
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}
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public function dropPrimaryKey($table) {
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if (!$this->constraintExists($table, 'pkey')) {
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return FALSE;
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}
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$this->connection->query('ALTER TABLE {' . $table . '} DROP CONSTRAINT {' . $table . '}_pkey');
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return TRUE;
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}
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function addUniqueKey($table, $name, $fields) {
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if (!$this->tableExists($table)) {
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throw new DatabaseSchemaObjectDoesNotExistException(t("Cannot add unique key %name to table %table: table doesn't exist.", array('%table' => $table, '%name' => $name)));
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}
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if ($this->constraintExists($table, $name . '_key')) {
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throw new DatabaseSchemaObjectExistsException(t("Cannot add unique key %name to table %table: unique key already exists.", array('%table' => $table, '%name' => $name)));
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}
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$name = '{' . $table . '}_' . $name . '_key';
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$this->connection->query('ALTER TABLE {' . $table . '} ADD CONSTRAINT "' . $name . '" UNIQUE (' . implode(',', $fields) . ')');
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}
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public function dropUniqueKey($table, $name) {
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if (!$this->constraintExists($table, $name . '_key')) {
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return FALSE;
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}
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$name = '{' . $table . '}_' . $name . '_key';
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$this->connection->query('ALTER TABLE {' . $table . '} DROP CONSTRAINT "' . $name . '"');
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return TRUE;
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}
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public function addIndex($table, $name, $fields) {
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if (!$this->tableExists($table)) {
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throw new DatabaseSchemaObjectDoesNotExistException(t("Cannot add index %name to table %table: table doesn't exist.", array('%table' => $table, '%name' => $name)));
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}
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if ($this->indexExists($table, $name)) {
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throw new DatabaseSchemaObjectExistsException(t("Cannot add index %name to table %table: index already exists.", array('%table' => $table, '%name' => $name)));
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}
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$this->connection->query($this->_createIndexSql($table, $name, $fields));
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}
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public function dropIndex($table, $name) {
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if (!$this->indexExists($table, $name)) {
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return FALSE;
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}
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$name = '{' . $table . '}_' . $name . '_idx';
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$this->connection->query('DROP INDEX ' . $name);
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return TRUE;
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}
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public function changeField($table, $field, $field_new, $spec, $new_keys = array()) {
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if (!$this->columnExists($table, $field)) {
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throw new DatabaseSchemaObjectDoesNotExistException(t("Cannot change the definition of field %table.%name: field doesn't exist.", array('%table' => $table, '%name' => $field)));
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}
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if (($field != $field_new) && $this->columnExists($table, $field_new)) {
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throw new DatabaseSchemaObjectExistsException(t("Cannot rename field %table.%name to %name_new: target field already exists.", array('%table' => $table, '%name' => $field, '%name_new' => $field_new)));
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}
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if (!array_key_exists('size', $spec)) {
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$spec['size'] = 'normal';
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}
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// We need to typecast the new column to best be able to transfer the data
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// Schema_pgsql::getFieldTypeMap() will return possibilities that are not
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|
// 'cast-able' such as 'serial' - so they need to be casted int instead.
|
|
$map = $this->getFieldTypeMap();
|
|
$typecast = $map[$spec['type'] . ':' . $spec['size']];
|
|
if (in_array($typecast, array('serial', 'bigserial', 'numeric'))) {
|
|
$typecast = 'int';
|
|
}
|
|
|
|
|
|
$this->connection->query("ALTER TABLE {" . $table . "} ALTER $field SET $field_new = CAST(" . $field . "_old as " . $typecast . ")");
|
|
|
|
$this->addField($table, "$field_new", $spec);
|
|
|
|
$this->dropField($table, $field . '_old');
|
|
|
|
// Rename the column if necessary.
|
|
if ($field != $field_new) {
|
|
$this->connection->query('ALTER TABLE {' . $table . '} RENAME "' . $field . '" TO "' . $field_new . '_old"');
|
|
}
|
|
|
|
if (isset($new_keys)) {
|
|
$this->_createKeys($table, $new_keys);
|
|
}
|
|
}
|
|
|
|
protected function _createIndexSql($table, $name, $fields) {
|
|
$query = 'CREATE INDEX "{' . $table . '}_' . $name . '_idx" ON {' . $table . '} (';
|
|
$query .= $this->_createKeySql($fields) . ')';
|
|
return $query;
|
|
}
|
|
|
|
protected function _createKeys($table, $new_keys) {
|
|
if (isset($new_keys['primary key'])) {
|
|
$this->addPrimaryKey($table, $new_keys['primary key']);
|
|
}
|
|
if (isset($new_keys['unique keys'])) {
|
|
foreach ($new_keys['unique keys'] as $name => $fields) {
|
|
$this->addUniqueKey($table, $name, $fields);
|
|
}
|
|
}
|
|
if (isset($new_keys['indexes'])) {
|
|
foreach ($new_keys['indexes'] as $name => $fields) {
|
|
$this->addIndex($table, $name, $fields);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Retrieve a table or column comment.
|
|
*/
|
|
public function getComment($table, $column = NULL) {
|
|
$table = $this->connection->prefixTables('{' . $table . '}');
|
|
// Don't use {} around pg_class, pg_attribute tables.
|
|
if (isset($column)) {
|
|
return $this->connection->query('SELECT col_description(oid, attnum) FROM pg_class, pg_attribute WHERE attrelid = oid AND relname = ? AND attname = ?', array($table, $column))->fetchField();
|
|
}
|
|
else {
|
|
return $this->connection->query('SELECT obj_description(oid, ?) FROM pg_class WHERE relname = ?', array('pg_class', $table))->fetchField();
|
|
}
|
|
}
|
|
}
|