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- <?php
- namespace Drupal\Core\Database\Driver\pgsql;
- use Drupal\Component\Utility\Unicode;
- use Drupal\Core\Database\SchemaObjectExistsException;
- use Drupal\Core\Database\SchemaObjectDoesNotExistException;
- use Drupal\Core\Database\Schema as DatabaseSchema;
- /**
- * @addtogroup schemaapi
- * @{
- */
- /**
- * PostgreSQL implementation of \Drupal\Core\Database\Schema.
- */
- class Schema extends DatabaseSchema {
- /**
- * A cache of information about blob columns and sequences of tables.
- *
- * This is collected by Schema::queryTableInformation(), by introspecting the
- * database.
- *
- * @see \Drupal\Core\Database\Driver\pgsql\Schema::queryTableInformation()
- * @var array
- */
- protected $tableInformation = [];
- /**
- * The maximum allowed length for index, primary key and constraint names.
- *
- * Value will usually be set to a 63 chars limit but PostgreSQL allows
- * to higher this value before compiling, so we need to check for that.
- *
- * @var int
- */
- protected $maxIdentifierLength;
- /**
- * PostgreSQL's temporary namespace name.
- *
- * @var string
- */
- protected $tempNamespaceName;
- /**
- * Make sure to limit identifiers according to PostgreSQL compiled in length.
- *
- * PostgreSQL allows in standard configuration no longer identifiers than 63
- * chars for table/relation names, indexes, primary keys, and constraints. So
- * we map all identifiers that are too long to drupal_base64hash_tag, where
- * tag is one of:
- * - idx for indexes
- * - key for constraints
- * - pkey for primary keys
- *
- * @param $identifiers
- * The arguments to build the identifier string
- * @return
- * The index/constraint/pkey identifier
- */
- protected function ensureIdentifiersLength($identifier) {
- $args = func_get_args();
- $info = $this->getPrefixInfo($identifier);
- $args[0] = $info['table'];
- $identifierName = implode('__', $args);
- // Retrieve the max identifier length which is usually 63 characters
- // but can be altered before PostgreSQL is compiled so we need to check.
- $this->maxIdentifierLength = $this->connection->query("SHOW max_identifier_length")->fetchField();
- if (strlen($identifierName) > $this->maxIdentifierLength) {
- $saveIdentifier = '"drupal_' . $this->hashBase64($identifierName) . '_' . $args[2] . '"';
- }
- else {
- $saveIdentifier = $identifierName;
- }
- return $saveIdentifier;
- }
- /**
- * Fetch the list of blobs and sequences used on a table.
- *
- * We introspect the database to collect the information required by insert
- * and update queries.
- *
- * @param $table_name
- * The non-prefixed name of the table.
- * @return
- * An object with two member variables:
- * - 'blob_fields' that lists all the blob fields in the table.
- * - 'sequences' that lists the sequences used in that table.
- */
- public function queryTableInformation($table) {
- // Generate a key to reference this table's information on.
- $key = $this->connection->prefixTables('{' . $table . '}');
- // Take into account that temporary tables are stored in a different schema.
- // \Drupal\Core\Database\Connection::generateTemporaryTableName() sets the
- // 'db_temporary_' prefix to all temporary tables.
- if (strpos($key, '.') === FALSE && strpos($table, 'db_temporary_') === FALSE) {
- $key = 'public.' . $key;
- }
- else {
- $key = $this->getTempNamespaceName() . '.' . $key;
- }
- if (!isset($this->tableInformation[$key])) {
- $table_information = (object) [
- 'blob_fields' => [],
- 'sequences' => [],
- ];
- $this->connection->addSavepoint();
- try {
- // The bytea columns and sequences for a table can be found in
- // pg_attribute, which is significantly faster than querying the
- // information_schema. The data type of a field can be found by lookup
- // of the attribute ID, and the default value must be extracted from the
- // node tree for the attribute definition instead of the historical
- // human-readable column, adsrc.
- $sql = <<<'EOD'
- SELECT pg_attribute.attname AS column_name, format_type(pg_attribute.atttypid, pg_attribute.atttypmod) AS data_type, pg_get_expr(pg_attrdef.adbin, pg_attribute.attrelid) AS column_default
- FROM pg_attribute
- LEFT JOIN pg_attrdef ON pg_attrdef.adrelid = pg_attribute.attrelid AND pg_attrdef.adnum = pg_attribute.attnum
- WHERE pg_attribute.attnum > 0
- AND NOT pg_attribute.attisdropped
- AND pg_attribute.attrelid = :key::regclass
- AND (format_type(pg_attribute.atttypid, pg_attribute.atttypmod) = 'bytea'
- OR pg_attrdef.adsrc LIKE 'nextval%')
- EOD;
- $result = $this->connection->query($sql, [
- ':key' => $key,
- ]);
- }
- catch (\Exception $e) {
- $this->connection->rollbackSavepoint();
- throw $e;
- }
- $this->connection->releaseSavepoint();
- // If the table information does not yet exist in the PostgreSQL
- // metadata, then return the default table information here, so that it
- // will not be cached.
- if (empty($result)) {
- return $table_information;
- }
- foreach ($result as $column) {
- if ($column->data_type == 'bytea') {
- $table_information->blob_fields[$column->column_name] = TRUE;
- }
- elseif (preg_match("/nextval\('([^']+)'/", $column->column_default, $matches)) {
- // We must know of any sequences in the table structure to help us
- // return the last insert id. If there is more than 1 sequences the
- // first one (index 0 of the sequences array) will be used.
- $table_information->sequences[] = $matches[1];
- $table_information->serial_fields[] = $column->column_name;
- }
- }
- $this->tableInformation[$key] = $table_information;
- }
- return $this->tableInformation[$key];
- }
- /**
- * Gets PostgreSQL's temporary namespace name.
- *
- * @return string
- * PostgreSQL's temporary namespace name.
- */
- protected function getTempNamespaceName() {
- if (!isset($this->tempNamespaceName)) {
- $this->tempNamespaceName = $this->connection->query('SELECT nspname FROM pg_namespace WHERE oid = pg_my_temp_schema()')->fetchField();
- }
- return $this->tempNamespaceName;
- }
- /**
- * Resets information about table blobs, sequences and serial fields.
- *
- * @param $table
- * The non-prefixed name of the table.
- */
- protected function resetTableInformation($table) {
- $key = $this->connection->prefixTables('{' . $table . '}');
- if (strpos($key, '.') === FALSE) {
- $key = 'public.' . $key;
- }
- unset($this->tableInformation[$key]);
- }
- /**
- * Fetch the list of CHECK constraints used on a field.
- *
- * We introspect the database to collect the information required by field
- * alteration.
- *
- * @param $table
- * The non-prefixed name of the table.
- * @param $field
- * The name of the field.
- * @return
- * An array of all the checks for the field.
- */
- public function queryFieldInformation($table, $field) {
- $prefixInfo = $this->getPrefixInfo($table, TRUE);
- // Split the key into schema and table for querying.
- $schema = $prefixInfo['schema'];
- $table_name = $prefixInfo['table'];
- $this->connection->addSavepoint();
- try {
- $checks = $this->connection->query("SELECT conname FROM pg_class cl INNER JOIN pg_constraint co ON co.conrelid = cl.oid INNER JOIN pg_attribute attr ON attr.attrelid = cl.oid AND attr.attnum = ANY (co.conkey) INNER JOIN pg_namespace ns ON cl.relnamespace = ns.oid WHERE co.contype = 'c' AND ns.nspname = :schema AND cl.relname = :table AND attr.attname = :column", [
- ':schema' => $schema,
- ':table' => $table_name,
- ':column' => $field,
- ]);
- }
- catch (\Exception $e) {
- $this->connection->rollbackSavepoint();
- throw $e;
- }
- $this->connection->releaseSavepoint();
- $field_information = $checks->fetchCol();
- return $field_information;
- }
- /**
- * Generate SQL to create a new table from a Drupal schema definition.
- *
- * @param $name
- * The name of the table to create.
- * @param $table
- * A Schema API table definition array.
- * @return
- * An array of SQL statements to create the table.
- */
- protected function createTableSql($name, $table) {
- $sql_fields = [];
- foreach ($table['fields'] as $field_name => $field) {
- $sql_fields[] = $this->createFieldSql($field_name, $this->processField($field));
- }
- $sql_keys = [];
- if (isset($table['primary key']) && is_array($table['primary key'])) {
- $sql_keys[] = 'CONSTRAINT ' . $this->ensureIdentifiersLength($name, '', 'pkey') . ' PRIMARY KEY (' . $this->createPrimaryKeySql($table['primary key']) . ')';
- }
- if (isset($table['unique keys']) && is_array($table['unique keys'])) {
- foreach ($table['unique keys'] as $key_name => $key) {
- $sql_keys[] = 'CONSTRAINT ' . $this->ensureIdentifiersLength($name, $key_name, 'key') . ' UNIQUE (' . implode(', ', $key) . ')';
- }
- }
- $sql = "CREATE TABLE {" . $name . "} (\n\t";
- $sql .= implode(",\n\t", $sql_fields);
- if (count($sql_keys) > 0) {
- $sql .= ",\n\t";
- }
- $sql .= implode(",\n\t", $sql_keys);
- $sql .= "\n)";
- $statements[] = $sql;
- if (isset($table['indexes']) && is_array($table['indexes'])) {
- foreach ($table['indexes'] as $key_name => $key) {
- $statements[] = $this->_createIndexSql($name, $key_name, $key);
- }
- }
- // Add table comment.
- if (!empty($table['description'])) {
- $statements[] = 'COMMENT ON TABLE {' . $name . '} IS ' . $this->prepareComment($table['description']);
- }
- // Add column comments.
- foreach ($table['fields'] as $field_name => $field) {
- if (!empty($field['description'])) {
- $statements[] = 'COMMENT ON COLUMN {' . $name . '}.' . $field_name . ' IS ' . $this->prepareComment($field['description']);
- }
- }
- return $statements;
- }
- /**
- * Create an SQL string for a field to be used in table creation or
- * alteration.
- *
- * Before passing a field out of a schema definition into this
- * function it has to be processed by _db_process_field().
- *
- * @param $name
- * Name of the field.
- * @param $spec
- * The field specification, as per the schema data structure format.
- */
- protected function createFieldSql($name, $spec) {
- // The PostgreSQL server converts names into lowercase, unless quoted.
- $sql = '"' . $name . '" ' . $spec['pgsql_type'];
- if (isset($spec['type']) && $spec['type'] == 'serial') {
- unset($spec['not null']);
- }
- if (in_array($spec['pgsql_type'], ['varchar', 'character']) && isset($spec['length'])) {
- $sql .= '(' . $spec['length'] . ')';
- }
- elseif (isset($spec['precision']) && isset($spec['scale'])) {
- $sql .= '(' . $spec['precision'] . ', ' . $spec['scale'] . ')';
- }
- if (!empty($spec['unsigned'])) {
- $sql .= " CHECK ($name >= 0)";
- }
- if (isset($spec['not null'])) {
- if ($spec['not null']) {
- $sql .= ' NOT NULL';
- }
- else {
- $sql .= ' NULL';
- }
- }
- if (array_key_exists('default', $spec)) {
- $default = $this->escapeDefaultValue($spec['default']);
- $sql .= " default $default";
- }
- return $sql;
- }
- /**
- * Set database-engine specific properties for a field.
- *
- * @param $field
- * A field description array, as specified in the schema documentation.
- */
- protected function processField($field) {
- if (!isset($field['size'])) {
- $field['size'] = 'normal';
- }
- // Set the correct database-engine specific datatype.
- // In case one is already provided, force it to lowercase.
- if (isset($field['pgsql_type'])) {
- $field['pgsql_type'] = Unicode::strtolower($field['pgsql_type']);
- }
- else {
- $map = $this->getFieldTypeMap();
- $field['pgsql_type'] = $map[$field['type'] . ':' . $field['size']];
- }
- if (!empty($field['unsigned'])) {
- // Unsigned datatypes are not supported in PostgreSQL 9.1. In MySQL,
- // they are used to ensure a positive number is inserted and it also
- // doubles the maximum integer size that can be stored in a field.
- // The PostgreSQL schema in Drupal creates a check constraint
- // to ensure that a value inserted is >= 0. To provide the extra
- // integer capacity, here, we bump up the column field size.
- if (!isset($map)) {
- $map = $this->getFieldTypeMap();
- }
- switch ($field['pgsql_type']) {
- case 'smallint':
- $field['pgsql_type'] = $map['int:medium'];
- break;
- case 'int' :
- $field['pgsql_type'] = $map['int:big'];
- break;
- }
- }
- if (isset($field['type']) && $field['type'] == 'serial') {
- unset($field['not null']);
- }
- return $field;
- }
- /**
- * {@inheritdoc}
- */
- public function getFieldTypeMap() {
- // Put :normal last so it gets preserved by array_flip. This makes
- // it much easier for modules (such as schema.module) to map
- // database types back into schema types.
- // $map does not use drupal_static as its value never changes.
- static $map = [
- 'varchar_ascii:normal' => 'varchar',
- 'varchar:normal' => 'varchar',
- 'char:normal' => 'character',
- 'text:tiny' => 'text',
- 'text:small' => 'text',
- 'text:medium' => 'text',
- 'text:big' => 'text',
- 'text:normal' => 'text',
- 'int:tiny' => 'smallint',
- 'int:small' => 'smallint',
- 'int:medium' => 'int',
- 'int:big' => 'bigint',
- 'int:normal' => 'int',
- 'float:tiny' => 'real',
- 'float:small' => 'real',
- 'float:medium' => 'real',
- 'float:big' => 'double precision',
- 'float:normal' => 'real',
- 'numeric:normal' => 'numeric',
- 'blob:big' => 'bytea',
- 'blob:normal' => 'bytea',
- 'serial:tiny' => 'serial',
- 'serial:small' => 'serial',
- 'serial:medium' => 'serial',
- 'serial:big' => 'bigserial',
- 'serial:normal' => 'serial',
- ];
- return $map;
- }
- protected function _createKeySql($fields) {
- $return = [];
- foreach ($fields as $field) {
- if (is_array($field)) {
- $return[] = 'substr(' . $field[0] . ', 1, ' . $field[1] . ')';
- }
- else {
- $return[] = '"' . $field . '"';
- }
- }
- return implode(', ', $return);
- }
- /**
- * Create the SQL expression for primary keys.
- *
- * Postgresql does not support key length. It does support fillfactor, but
- * that requires a separate database lookup for each column in the key. The
- * key length defined in the schema is ignored.
- */
- protected function createPrimaryKeySql($fields) {
- $return = [];
- foreach ($fields as $field) {
- if (is_array($field)) {
- $return[] = '"' . $field[0] . '"';
- }
- else {
- $return[] = '"' . $field . '"';
- }
- }
- return implode(', ', $return);
- }
- /**
- * {@inheritdoc}
- */
- public function tableExists($table) {
- $prefixInfo = $this->getPrefixInfo($table, TRUE);
- return (bool) $this->connection->query("SELECT 1 FROM pg_tables WHERE schemaname = :schema AND tablename = :table", [':schema' => $prefixInfo['schema'], ':table' => $prefixInfo['table']])->fetchField();
- }
- /**
- * {@inheritdoc}
- */
- public function renameTable($table, $new_name) {
- if (!$this->tableExists($table)) {
- throw new SchemaObjectDoesNotExistException(t("Cannot rename @table to @table_new: table @table doesn't exist.", ['@table' => $table, '@table_new' => $new_name]));
- }
- if ($this->tableExists($new_name)) {
- throw new SchemaObjectExistsException(t("Cannot rename @table to @table_new: table @table_new already exists.", ['@table' => $table, '@table_new' => $new_name]));
- }
- // Get the schema and tablename for the old table.
- $old_full_name = $this->connection->prefixTables('{' . $table . '}');
- list($old_schema, $old_table_name) = strpos($old_full_name, '.') ? explode('.', $old_full_name) : ['public', $old_full_name];
- // Index names and constraint names are global in PostgreSQL, so we need to
- // rename them when renaming the table.
- $indexes = $this->connection->query('SELECT indexname FROM pg_indexes WHERE schemaname = :schema AND tablename = :table', [':schema' => $old_schema, ':table' => $old_table_name]);
- foreach ($indexes as $index) {
- // Get the index type by suffix, e.g. idx/key/pkey
- $index_type = substr($index->indexname, strrpos($index->indexname, '_') + 1);
- // If the index is already rewritten by ensureIdentifiersLength() to not
- // exceed the 63 chars limit of PostgreSQL, we need to take care of that.
- // Example (drupal_Gk7Su_T1jcBHVuvSPeP22_I3Ni4GrVEgTYlIYnBJkro_idx).
- if (strpos($index->indexname, 'drupal_') !== FALSE) {
- preg_match('/^drupal_(.*)_' . preg_quote($index_type) . '/', $index->indexname, $matches);
- $index_name = $matches[1];
- }
- else {
- // Make sure to remove the suffix from index names, because
- // $this->ensureIdentifiersLength() will add the suffix again and thus
- // would result in a wrong index name.
- preg_match('/^' . preg_quote($old_full_name) . '__(.*)__' . preg_quote($index_type) . '/', $index->indexname, $matches);
- $index_name = $matches[1];
- }
- $this->connection->query('ALTER INDEX "' . $index->indexname . '" RENAME TO ' . $this->ensureIdentifiersLength($new_name, $index_name, $index_type) . '');
- }
- // Ensure the new table name does not include schema syntax.
- $prefixInfo = $this->getPrefixInfo($new_name);
- // Rename sequences if there's a serial fields.
- $info = $this->queryTableInformation($table);
- if (!empty($info->serial_fields)) {
- foreach ($info->serial_fields as $field) {
- $old_sequence = $this->prefixNonTable($table, $field, 'seq');
- $new_sequence = $this->prefixNonTable($new_name, $field, 'seq');
- $this->connection->query('ALTER SEQUENCE ' . $old_sequence . ' RENAME TO ' . $new_sequence);
- }
- }
- // Now rename the table.
- $this->connection->query('ALTER TABLE {' . $table . '} RENAME TO ' . $prefixInfo['table']);
- $this->resetTableInformation($table);
- }
- /**
- * {@inheritdoc}
- */
- public function dropTable($table) {
- if (!$this->tableExists($table)) {
- return FALSE;
- }
- $this->connection->query('DROP TABLE {' . $table . '}');
- $this->resetTableInformation($table);
- return TRUE;
- }
- /**
- * {@inheritdoc}
- */
- public function addField($table, $field, $spec, $new_keys = []) {
- if (!$this->tableExists($table)) {
- throw new SchemaObjectDoesNotExistException(t("Cannot add field @table.@field: table doesn't exist.", ['@field' => $field, '@table' => $table]));
- }
- if ($this->fieldExists($table, $field)) {
- throw new SchemaObjectExistsException(t("Cannot add field @table.@field: field already exists.", ['@field' => $field, '@table' => $table]));
- }
- // Fields that are part of a PRIMARY KEY must be added as NOT NULL.
- $is_primary_key = isset($keys_new['primary key']) && in_array($field, $keys_new['primary key'], TRUE);
- $fixnull = FALSE;
- if (!empty($spec['not null']) && !isset($spec['default']) && !$is_primary_key) {
- $fixnull = TRUE;
- $spec['not null'] = FALSE;
- }
- $query = 'ALTER TABLE {' . $table . '} ADD COLUMN ';
- $query .= $this->createFieldSql($field, $this->processField($spec));
- $this->connection->query($query);
- if (isset($spec['initial'])) {
- $this->connection->update($table)
- ->fields([$field => $spec['initial']])
- ->execute();
- }
- if (isset($spec['initial_from_field'])) {
- $this->connection->update($table)
- ->expression($field, $spec['initial_from_field'])
- ->execute();
- }
- if ($fixnull) {
- $this->connection->query("ALTER TABLE {" . $table . "} ALTER $field SET NOT NULL");
- }
- if (isset($new_keys)) {
- // Make sure to drop the existing primary key before adding a new one.
- // This is only needed when adding a field because this method, unlike
- // changeField(), is supposed to handle primary keys automatically.
- if (isset($new_keys['primary key']) && $this->constraintExists($table, 'pkey')) {
- $this->dropPrimaryKey($table);
- }
- $this->_createKeys($table, $new_keys);
- }
- // Add column comment.
- if (!empty($spec['description'])) {
- $this->connection->query('COMMENT ON COLUMN {' . $table . '}.' . $field . ' IS ' . $this->prepareComment($spec['description']));
- }
- $this->resetTableInformation($table);
- }
- /**
- * {@inheritdoc}
- */
- public function dropField($table, $field) {
- if (!$this->fieldExists($table, $field)) {
- return FALSE;
- }
- $this->connection->query('ALTER TABLE {' . $table . '} DROP COLUMN "' . $field . '"');
- $this->resetTableInformation($table);
- return TRUE;
- }
- /**
- * {@inheritdoc}
- */
- public function fieldSetDefault($table, $field, $default) {
- if (!$this->fieldExists($table, $field)) {
- throw new SchemaObjectDoesNotExistException(t("Cannot set default value of field @table.@field: field doesn't exist.", ['@table' => $table, '@field' => $field]));
- }
- $default = $this->escapeDefaultValue($default);
- $this->connection->query('ALTER TABLE {' . $table . '} ALTER COLUMN "' . $field . '" SET DEFAULT ' . $default);
- }
- /**
- * {@inheritdoc}
- */
- public function fieldSetNoDefault($table, $field) {
- if (!$this->fieldExists($table, $field)) {
- throw new SchemaObjectDoesNotExistException(t("Cannot remove default value of field @table.@field: field doesn't exist.", ['@table' => $table, '@field' => $field]));
- }
- $this->connection->query('ALTER TABLE {' . $table . '} ALTER COLUMN "' . $field . '" DROP DEFAULT');
- }
- /**
- * {@inheritdoc}
- */
- public function fieldExists($table, $column) {
- $prefixInfo = $this->getPrefixInfo($table);
- return (bool) $this->connection->query("SELECT 1 FROM pg_attribute WHERE attrelid = :key::regclass AND attname = :column AND NOT attisdropped AND attnum > 0", [':key' => $prefixInfo['schema'] . '.' . $prefixInfo['table'], ':column' => $column])->fetchField();
- }
- /**
- * {@inheritdoc}
- */
- public function indexExists($table, $name) {
- // Details http://www.postgresql.org/docs/9.1/interactive/view-pg-indexes.html
- $index_name = $this->ensureIdentifiersLength($table, $name, 'idx');
- // Remove leading and trailing quotes because the index name is in a WHERE
- // clause and not used as an identifier.
- $index_name = str_replace('"', '', $index_name);
- return (bool) $this->connection->query("SELECT 1 FROM pg_indexes WHERE indexname = '$index_name'")->fetchField();
- }
- /**
- * Helper function: check if a constraint (PK, FK, UK) exists.
- *
- * @param string $table
- * The name of the table.
- * @param string $name
- * The name of the constraint (typically 'pkey' or '[constraint]__key').
- *
- * @return bool
- * TRUE if the constraint exists, FALSE otherwise.
- */
- public function constraintExists($table, $name) {
- // ::ensureIdentifiersLength() expects three parameters, although not
- // explicitly stated in its signature, thus we split our constraint name in
- // a proper name and a suffix.
- if ($name == 'pkey') {
- $suffix = $name;
- $name = '';
- }
- else {
- $pos = strrpos($name, '__');
- $suffix = substr($name, $pos + 2);
- $name = substr($name, 0, $pos);
- }
- $constraint_name = $this->ensureIdentifiersLength($table, $name, $suffix);
- // Remove leading and trailing quotes because the index name is in a WHERE
- // clause and not used as an identifier.
- $constraint_name = str_replace('"', '', $constraint_name);
- return (bool) $this->connection->query("SELECT 1 FROM pg_constraint WHERE conname = '$constraint_name'")->fetchField();
- }
- /**
- * {@inheritdoc}
- */
- public function addPrimaryKey($table, $fields) {
- if (!$this->tableExists($table)) {
- throw new SchemaObjectDoesNotExistException(t("Cannot add primary key to table @table: table doesn't exist.", ['@table' => $table]));
- }
- if ($this->constraintExists($table, 'pkey')) {
- throw new SchemaObjectExistsException(t("Cannot add primary key to table @table: primary key already exists.", ['@table' => $table]));
- }
- $this->connection->query('ALTER TABLE {' . $table . '} ADD CONSTRAINT ' . $this->ensureIdentifiersLength($table, '', 'pkey') . ' PRIMARY KEY (' . $this->createPrimaryKeySql($fields) . ')');
- $this->resetTableInformation($table);
- }
- /**
- * {@inheritdoc}
- */
- public function dropPrimaryKey($table) {
- if (!$this->constraintExists($table, 'pkey')) {
- return FALSE;
- }
- $this->connection->query('ALTER TABLE {' . $table . '} DROP CONSTRAINT ' . $this->ensureIdentifiersLength($table, '', 'pkey'));
- $this->resetTableInformation($table);
- return TRUE;
- }
- /**
- * {@inheritdoc}
- */
- public function addUniqueKey($table, $name, $fields) {
- if (!$this->tableExists($table)) {
- throw new SchemaObjectDoesNotExistException(t("Cannot add unique key @name to table @table: table doesn't exist.", ['@table' => $table, '@name' => $name]));
- }
- if ($this->constraintExists($table, $name . '__key')) {
- throw new SchemaObjectExistsException(t("Cannot add unique key @name to table @table: unique key already exists.", ['@table' => $table, '@name' => $name]));
- }
- $this->connection->query('ALTER TABLE {' . $table . '} ADD CONSTRAINT ' . $this->ensureIdentifiersLength($table, $name, 'key') . ' UNIQUE (' . implode(',', $fields) . ')');
- $this->resetTableInformation($table);
- }
- /**
- * {@inheritdoc}
- */
- public function dropUniqueKey($table, $name) {
- if (!$this->constraintExists($table, $name . '__key')) {
- return FALSE;
- }
- $this->connection->query('ALTER TABLE {' . $table . '} DROP CONSTRAINT ' . $this->ensureIdentifiersLength($table, $name, 'key'));
- $this->resetTableInformation($table);
- return TRUE;
- }
- /**
- * {@inheritdoc}
- */
- public function addIndex($table, $name, $fields, array $spec) {
- if (!$this->tableExists($table)) {
- throw new SchemaObjectDoesNotExistException(t("Cannot add index @name to table @table: table doesn't exist.", ['@table' => $table, '@name' => $name]));
- }
- if ($this->indexExists($table, $name)) {
- throw new SchemaObjectExistsException(t("Cannot add index @name to table @table: index already exists.", ['@table' => $table, '@name' => $name]));
- }
- $this->connection->query($this->_createIndexSql($table, $name, $fields));
- $this->resetTableInformation($table);
- }
- /**
- * {@inheritdoc}
- */
- public function dropIndex($table, $name) {
- if (!$this->indexExists($table, $name)) {
- return FALSE;
- }
- $this->connection->query('DROP INDEX ' . $this->ensureIdentifiersLength($table, $name, 'idx'));
- $this->resetTableInformation($table);
- return TRUE;
- }
- /**
- * {@inheritdoc}
- */
- public function changeField($table, $field, $field_new, $spec, $new_keys = []) {
- if (!$this->fieldExists($table, $field)) {
- throw new SchemaObjectDoesNotExistException(t("Cannot change the definition of field @table.@name: field doesn't exist.", ['@table' => $table, '@name' => $field]));
- }
- if (($field != $field_new) && $this->fieldExists($table, $field_new)) {
- throw new SchemaObjectExistsException(t("Cannot rename field @table.@name to @name_new: target field already exists.", ['@table' => $table, '@name' => $field, '@name_new' => $field_new]));
- }
- $spec = $this->processField($spec);
- // Type 'serial' is known to PostgreSQL, but only during table creation,
- // not when altering. Because of that, we create it here as an 'int'. After
- // we create it we manually re-apply the sequence.
- if (in_array($spec['pgsql_type'], ['serial', 'bigserial'])) {
- $field_def = 'int';
- }
- else {
- $field_def = $spec['pgsql_type'];
- }
- if (in_array($spec['pgsql_type'], ['varchar', 'character', 'text']) && isset($spec['length'])) {
- $field_def .= '(' . $spec['length'] . ')';
- }
- elseif (isset($spec['precision']) && isset($spec['scale'])) {
- $field_def .= '(' . $spec['precision'] . ', ' . $spec['scale'] . ')';
- }
- // Remove old check constraints.
- $field_info = $this->queryFieldInformation($table, $field);
- foreach ($field_info as $check) {
- $this->connection->query('ALTER TABLE {' . $table . '} DROP CONSTRAINT "' . $check . '"');
- }
- // Remove old default.
- $this->fieldSetNoDefault($table, $field);
- // Convert field type.
- // Usually, we do this via a simple typecast 'USING fieldname::type'. But
- // the typecast does not work for conversions to bytea.
- // @see http://www.postgresql.org/docs/current/static/datatype-binary.html
- $table_information = $this->queryTableInformation($table);
- $is_bytea = !empty($table_information->blob_fields[$field]);
- if ($spec['pgsql_type'] != 'bytea') {
- if ($is_bytea) {
- $this->connection->query('ALTER TABLE {' . $table . '} ALTER "' . $field . '" TYPE ' . $field_def . ' USING convert_from("' . $field . '"' . ", 'UTF8')");
- }
- else {
- $this->connection->query('ALTER TABLE {' . $table . '} ALTER "' . $field . '" TYPE ' . $field_def . ' USING "' . $field . '"::' . $field_def);
- }
- }
- else {
- // Do not attempt to convert a field that is bytea already.
- if (!$is_bytea) {
- // Convert to a bytea type by using the SQL replace() function to
- // convert any single backslashes in the field content to double
- // backslashes ('\' to '\\').
- $this->connection->query('ALTER TABLE {' . $table . '} ALTER "' . $field . '" TYPE ' . $field_def . ' USING decode(replace("' . $field . '"' . ", E'\\\\', E'\\\\\\\\'), 'escape');");
- }
- }
- if (isset($spec['not null'])) {
- if ($spec['not null']) {
- $nullaction = 'SET NOT NULL';
- }
- else {
- $nullaction = 'DROP NOT NULL';
- }
- $this->connection->query('ALTER TABLE {' . $table . '} ALTER "' . $field . '" ' . $nullaction);
- }
- if (in_array($spec['pgsql_type'], ['serial', 'bigserial'])) {
- // Type "serial" is known to PostgreSQL, but *only* during table creation,
- // not when altering. Because of that, the sequence needs to be created
- // and initialized by hand.
- $seq = "{" . $table . "}_" . $field_new . "_seq";
- $this->connection->query("CREATE SEQUENCE " . $seq);
- // Set sequence to maximal field value to not conflict with existing
- // entries.
- $this->connection->query("SELECT setval('" . $seq . "', MAX(\"" . $field . '")) FROM {' . $table . "}");
- $this->connection->query('ALTER TABLE {' . $table . '} ALTER ' . $field . ' SET DEFAULT nextval(' . $this->connection->quote($seq) . ')');
- }
- // Rename the column if necessary.
- if ($field != $field_new) {
- $this->connection->query('ALTER TABLE {' . $table . '} RENAME "' . $field . '" TO "' . $field_new . '"');
- }
- // Add unsigned check if necessary.
- if (!empty($spec['unsigned'])) {
- $this->connection->query('ALTER TABLE {' . $table . '} ADD CHECK ("' . $field_new . '" >= 0)');
- }
- // Add default if necessary.
- if (isset($spec['default'])) {
- $this->fieldSetDefault($table, $field_new, $spec['default']);
- }
- // Change description if necessary.
- if (!empty($spec['description'])) {
- $this->connection->query('COMMENT ON COLUMN {' . $table . '}."' . $field_new . '" IS ' . $this->prepareComment($spec['description']));
- }
- if (isset($new_keys)) {
- $this->_createKeys($table, $new_keys);
- }
- $this->resetTableInformation($table);
- }
- protected function _createIndexSql($table, $name, $fields) {
- $query = 'CREATE INDEX ' . $this->ensureIdentifiersLength($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) {
- // Even though $new_keys is not a full schema it still has 'indexes' and
- // so is a partial schema. Technically addIndex() doesn't do anything
- // with it so passing an empty array would work as well.
- $this->addIndex($table, $name, $fields, $new_keys);
- }
- }
- }
- /**
- * Retrieve a table or column comment.
- */
- public function getComment($table, $column = NULL) {
- $info = $this->getPrefixInfo($table);
- // Don't use {} around pg_class, pg_attribute tables.
- if (isset($column)) {
- return $this->connection->query('SELECT col_description(oid, attnum) FROM pg_class, pg_attribute WHERE attrelid = oid AND relname = ? AND attname = ?', [$info['table'], $column])->fetchField();
- }
- else {
- return $this->connection->query('SELECT obj_description(oid, ?) FROM pg_class WHERE relname = ?', ['pg_class', $info['table']])->fetchField();
- }
- }
- /**
- * Calculates a base-64 encoded, PostgreSQL-safe sha-256 hash per PostgreSQL
- * documentation: 4.1. Lexical Structure.
- *
- * @param $data
- * String to be hashed.
- * @return string
- * A base-64 encoded sha-256 hash, with + and / replaced with _ and any =
- * padding characters removed.
- */
- protected function hashBase64($data) {
- $hash = base64_encode(hash('sha256', $data, TRUE));
- // Modify the hash so it's safe to use in PostgreSQL identifiers.
- return strtr($hash, ['+' => '_', '/' => '_', '=' => '']);
- }
- }
- /**
- * @} End of "addtogroup schemaapi".
- */
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