The Pdo\Pgsql class

(PHP 8 >= 8.4.0)

Introduzione

A PDO subclass representing a connection using the PostgreSQL PDO driver.

This driver supports a dedicated SQL query parser for the PostgreSQL dialect. It can handle the following:

Single and double-quoted literals, with doubling as escaping mechanism
C-style “escape” string literals
Dollar-quoted string literals
Two-dashes and C-style comments (non-nested).
Support for ?? as escape sequence for the ? operator.

Nota:
Because this parser recognizes dollar-quoted string literals, question marks inside them are not treated as parameter placeholders and do not need to be escaped. As of PHP 8.4.0, escaping question marks as ?? inside a dollar-quoted string is deprecated.

Sommario della classe

namespace Pdo;

class Pgsql extends PDO {

/* Costanti ereditate */

public const int PDO::PARAM_NULL;

public const int PDO::PARAM_BOOL = 5;

public const int PDO::PARAM_INT = 1;

public const int PDO::PARAM_STR = 2;

public const int PDO::PARAM_LOB = 3;

public const int PDO::PARAM_STMT = 4;

public const int PDO::PARAM_INPUT_OUTPUT;

public const int PDO::PARAM_STR_NATL;

public const int PDO::PARAM_STR_CHAR;

public const int PDO::PARAM_EVT_ALLOC;

public const int PDO::PARAM_EVT_FREE;

public const int PDO::PARAM_EVT_EXEC_PRE;

public const int PDO::PARAM_EVT_EXEC_POST;

public const int PDO::PARAM_EVT_FETCH_PRE;

public const int PDO::PARAM_EVT_FETCH_POST;

public const int PDO::PARAM_EVT_NORMALIZE;

public const int PDO::FETCH_DEFAULT;

public const int PDO::FETCH_LAZY;

public const int PDO::FETCH_ASSOC;

public const int PDO::FETCH_NUM;

public const int PDO::FETCH_BOTH;

public const int PDO::FETCH_OBJ;

public const int PDO::FETCH_BOUND;

public const int PDO::FETCH_COLUMN;

public const int PDO::FETCH_CLASS;

public const int PDO::FETCH_INTO;

public const int PDO::FETCH_FUNC;

public const int PDO::FETCH_GROUP;

public const int PDO::FETCH_UNIQUE;

public const int PDO::FETCH_KEY_PAIR;

public const int PDO::FETCH_CLASSTYPE;

public const int PDO::FETCH_SERIALIZE;

public const int PDO::FETCH_PROPS_LATE;

public const int PDO::FETCH_NAMED;

public const int PDO::ATTR_AUTOCOMMIT;

public const int PDO::ATTR_PREFETCH;

public const int PDO::ATTR_TIMEOUT;

public const int PDO::ATTR_ERRMODE;

public const int PDO::ATTR_SERVER_VERSION;

public const int PDO::ATTR_CLIENT_VERSION;

public const int PDO::ATTR_SERVER_INFO;

public const int PDO::ATTR_CONNECTION_STATUS;

public const int PDO::ATTR_CASE;

public const int PDO::ATTR_CURSOR_NAME;

public const int PDO::ATTR_CURSOR;

public const int PDO::ATTR_ORACLE_NULLS;

public const int PDO::ATTR_PERSISTENT;

public const int PDO::ATTR_STATEMENT_CLASS;

public const int PDO::ATTR_FETCH_TABLE_NAMES;

public const int PDO::ATTR_FETCH_CATALOG_NAMES;

public const int PDO::ATTR_DRIVER_NAME;

public const int PDO::ATTR_STRINGIFY_FETCHES;

public const int PDO::ATTR_MAX_COLUMN_LEN;

public const int PDO::ATTR_EMULATE_PREPARES;

public const int PDO::ATTR_DEFAULT_FETCH_MODE;

public const int PDO::ATTR_DEFAULT_STR_PARAM;

public const int PDO::ERRMODE_SILENT;

public const int PDO::ERRMODE_WARNING;

public const int PDO::ERRMODE_EXCEPTION;

public const int PDO::CASE_NATURAL;

public const int PDO::CASE_LOWER;

public const int PDO::CASE_UPPER;

public const int PDO::NULL_NATURAL;

public const int PDO::NULL_EMPTY_STRING;

public const int PDO::NULL_TO_STRING;

public const string PDO::ERR_NONE;

public const int PDO::FETCH_ORI_NEXT;

public const int PDO::FETCH_ORI_PRIOR;

public const int PDO::FETCH_ORI_FIRST;

public const int PDO::FETCH_ORI_LAST;

public const int PDO::FETCH_ORI_ABS;

public const int PDO::FETCH_ORI_REL;

public const int PDO::CURSOR_FWDONLY;

public const int PDO::CURSOR_SCROLL;

/* Costanti */

public const int ATTR_DISABLE_PREPARES;

public const int ATTR_RESULT_MEMORY_SIZE;

public const int TRANSACTION_IDLE;

public const int TRANSACTION_ACTIVE;

public const int TRANSACTION_INTRANS;

public const int TRANSACTION_INERROR;

public const int TRANSACTION_UNKNOWN;

/* Metodi */

public function copyFromArray(
    string $tableName,
    array|Traversable $rows,
    string $separator = "\t",
    string $nullAs = "\\\\N",
    ?string $fields = null
): bool

public function copyFromFile(
    string $tableName,
    string $filename,
    string $separator = "\t",
    string $nullAs = "\\\\N",
    ?string $fields = null
): bool

public function copyToArray(
    string $tableName,
    string $separator = "\t",
    string $nullAs = "\\\\N",
    ?string $fields = null
): array|false

public function copyToFile(
    string $tableName,
    string $filename,
    string $separator = "\t",
    string $nullAs = "\\\\N",
    ?string $fields = null
): bool

public function escapeIdentifier(string $input): string

public function getNotify(int $fetchMode = PDO::FETCH_DEFAULT, int $timeoutMilliseconds = 0): array|false

public function getPid(): int

public function lobCreate(): string|false

public function lobOpen(string $oid, string $mode = "rb"): resource|false

public function lobUnlink(string $oid): bool

public function setNoticeCallback(?callable $callback): void

/* Metodi ereditati */

public function PDO::__construct(
    string $dsn,
    ?string $username = null,
    #[\SensitiveParameter]?string $password = null,
    ?array $options = null
)

public function PDO::beginTransaction(): bool

public function PDO::commit(): bool

public static function PDO::connect(
    string $dsn,
    ?string $username = null,
    #[\SensitiveParameter]?string $password = null,
    ?array $options = null
): static

public function PDO::errorCode(): ?string

public function PDO::errorInfo(): array

public function PDO::exec(string $statement): int|false

public function PDO::getAttribute(int $attribute): mixed

public static function PDO::getAvailableDrivers(): array

public function PDO::inTransaction(): bool

public function PDO::lastInsertId(?string $name = null): string|false

public function PDO::prepare(string $query, array $options = []): PDOStatement|false

public function PDO::query(string $query, ?int $fetchMode = null): PDOStatement|false

public function PDO::query(string $query, ?int $fetchMode = PDO::FETCH_COLUMN, int $colno): PDOStatement|false

public function PDO::query(
    string $query,
    ?int $fetchMode = PDO::FETCH_CLASS,
    string $classname,
    array $constructorArgs
): PDOStatement|false

public function PDO::query(string $query, ?int $fetchMode = PDO::FETCH_INTO, object $object): PDOStatement|false

public function PDO::quote(string $string, int $type = PDO::PARAM_STR): string|false

public function PDO::rollBack(): bool

public function PDO::setAttribute(int $attribute, mixed $value): bool

}

Costanti predefinite

Pdo\Pgsql::ATTR_DISABLE_PREPARES

Send the query and the parameters to the server together in a single call, avoiding the need to create a named prepared statement separately. If the query is only going to be executed once this can reduce latency by avoiding an unnecessary server round-trip.

Pdo\Pgsql::ATTR_RESULT_MEMORY_SIZE

Returns the amount of memory, in bytes, allocated to the specified query result PDOStatement instance, or null if no results exist before the query is executed.

PDO::ATTR_PREFETCH

As of PHP 8.5.0, setting this attribute to 0 enables lazy (single-row) fetching: rows are retrieved from the server one at a time as they are fetched, instead of buffering the whole result set in memory before the first PDOStatement::fetch() call. This reduces memory usage for large result sets. Any other value keeps the default buffered behavior.

It can be set per connection with PDO::setAttribute(), or per statement via the PDO::prepare() or PDO::query() driver options.

Attenzione

In lazy mode, a connection can have only one active statement at a time. Running another statement silently discards any unread rows of the previous one; no error is raised.

Pdo\Pgsql::TRANSACTION_IDLE

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