14 #ifndef PQXX_H_TRANSACTION_BASE 15 #define PQXX_H_TRANSACTION_BASE 17 #include "pqxx/compiler-public.hxx" 18 #include "pqxx/internal/compiler-internal-pre.hxx" 20 #include <string_view> 31 #include "pqxx/connection.hxx" 32 #include "pqxx/internal/concat.hxx" 33 #include "pqxx/internal/encoding_group.hxx" 34 #include "pqxx/isolation.hxx" 35 #include "pqxx/result.hxx" 36 #include "pqxx/row.hxx" 37 #include "pqxx/stream_from.hxx" 41 class transaction_subtransaction;
42 class transaction_sql_cursor;
43 class transaction_stream_to;
44 class transaction_transaction_focus;
53 class transaction_focus;
110 [[nodiscard]] std::string esc(
char const text[])
const 113 return conn().esc(text);
116 [[nodiscard]] std::string
esc(
char const text[], std::size_t maxlen)
const 118 return conn().esc(text, maxlen);
121 [[nodiscard]] std::string
esc(std::string_view text)
const 123 return conn().esc(text);
138 [[nodiscard]] std::string
139 esc_raw(
unsigned char const data[], std::size_t len)
const 141 #include "pqxx/internal/ignore-deprecated-pre.hxx" 142 return conn().esc_raw(data, len);
143 #include "pqxx/internal/ignore-deprecated-post.hxx" 146 [[nodiscard]] std::string esc_raw(
zview)
const;
154 return conn().unesc_raw(text);
161 [[nodiscard]] std::string
unesc_raw(
char const *text)
const 163 return conn().unesc_raw(text);
168 template<
typename T> [[nodiscard]] std::string
quote(T
const &t)
const 170 #include "pqxx/internal/ignore-deprecated-pre.hxx" 171 return conn().quote(t);
172 #include "pqxx/internal/ignore-deprecated-post.hxx" 176 [[nodiscard]] std::string
177 quote_raw(
unsigned char const bin[], std::size_t len)
const 179 #include "pqxx/internal/ignore-deprecated-pre.hxx" 180 return conn().quote_raw(bin, len);
181 #include "pqxx/internal/ignore-deprecated-post.hxx" 185 [[nodiscard]] std::string quote_raw(
zview bin)
const;
188 [[nodiscard]] std::string
quote_name(std::string_view identifier)
const 190 return conn().quote_name(identifier);
194 [[nodiscard]] std::string
195 esc_like(std::string_view bin,
char escape_char =
'\\')
const 197 return conn().esc_like(bin, escape_char);
228 exec(std::string_view query, std::string_view desc = std::string_view{});
237 std::stringstream
const &query, std::string_view desc = std::string_view{})
239 return exec(query.str(), desc);
250 return exec_n(0, query, desc);
262 return exec_n(1, query, desc).
front();
273 std::string_view desc = std::string_view{});
279 template<
typename TYPE>
282 row const r{exec1(query, desc)};
283 if (std::size(r) != 1)
285 "Queried single value from result with ", std::size(r),
" columns.")};
286 return r[0].as<TYPE>();
338 template<
typename... TYPE> [[nodiscard]]
auto stream(std::string_view query)
340 return pqxx::internal::owning_stream_input_iteration<TYPE...>{
341 std::make_unique<pqxx::stream_from>(*
this,
from_query_t{}, query)};
373 template<
typename... Args>
result exec_params(
zview query, Args &&...args)
385 return exec_params_n(1, query, std::forward<Args>(args)...).
front();
393 return exec_params_n(0, query, std::forward<Args>(args)...);
399 template<
typename... Args>
402 auto const r{exec_params(query, std::forward<Args>(args)...)};
403 check_rowcount_params(rows, std::size(r));
438 template<
typename... Args>
442 return internal_exec_prepared(statement, pp.
make_c_params());
448 template<
typename... Args>
451 return exec_prepared_n(1, statement, std::forward<Args>(args)...).
front();
457 template<
typename... Args>
460 return exec_prepared_n(0, statement, std::forward<Args>(args)...);
467 template<
typename... Args>
471 auto const r{exec_prepared(statement, std::forward<Args>(args)...)};
472 check_rowcount_prepared(statement, rows, std::size(r));
482 void process_notice(
char const msg[])
const { m_conn.process_notice(msg); }
502 void set_variable(std::string_view var, std::string_view value);
508 std::string get_variable(std::string_view);
511 [[nodiscard]] std::string_view
name() const noexcept {
return m_name; }
520 std::shared_ptr<std::string> rollback_cmd) :
521 m_conn{c}, m_name{tname}, m_rollback_cmd{rollback_cmd}
536 void register_transaction();
539 void close() noexcept;
542 virtual void do_commit() = 0;
548 virtual void do_abort();
553 m_rollback_cmd = cmd;
557 result direct_exec(std::string_view, std::string_view desc =
""sv);
559 direct_exec(std::shared_ptr<std::string>, std::string_view desc =
""sv);
570 PQXX_PRIVATE
void check_pending_error();
572 template<
typename T>
bool parm_is_null(T *p)
const noexcept
576 template<
typename T>
bool parm_is_null(T)
const noexcept {
return false; }
579 internal_exec_prepared(
zview statement, internal::c_params
const &args);
581 result internal_exec_params(
zview query, internal::c_params
const &args);
584 void check_rowcount_prepared(
590 check_rowcount_params(std::size_t expected_rows, std::size_t actual_rows);
593 [[nodiscard]] std::string description()
const;
595 friend class pqxx::internal::gate::transaction_transaction_focus;
598 PQXX_PRIVATE
void register_pending_error(
zview) noexcept;
599 PQXX_PRIVATE
void register_pending_error(std::string &&) noexcept;
609 status m_status = status::active;
610 bool m_registered = false;
612 std::
string m_pending_error;
615 std::shared_ptr<
std::
string> m_rollback_cmd;
617 constexpr static
std::string_view s_type_name{
"transaction"sv};
624 std::string_view transaction_base::query_value<std::string_view>(
625 zview query, std::string_view desc) =
delete;
628 zview transaction_base::query_value<zview>(
629 zview query, std::string_view desc) =
delete;
637 template<pqxx::isolation_level isolation, pqxx::write_policy rw>
642 inline constexpr
zview begin_cmd<read_committed, write_policy::read_write>{
645 inline constexpr
zview begin_cmd<read_committed, write_policy::read_only>{
646 "BEGIN READ ONLY"_zv};
648 inline constexpr
zview begin_cmd<repeatable_read, write_policy::read_write>{
649 "BEGIN ISOLATION LEVEL REPEATABLE READ"_zv};
651 inline constexpr
zview begin_cmd<repeatable_read, write_policy::read_only>{
652 "BEGIN ISOLATION LEVEL REPEATABLE READ READ ONLY"_zv};
654 inline constexpr
zview begin_cmd<serializable, write_policy::read_write>{
655 "BEGIN ISOLATION LEVEL SERIALIZABLE"_zv};
657 inline constexpr
zview begin_cmd<serializable, write_policy::read_only>{
658 "BEGIN ISOLATION LEVEL SERIALIZABLE READ ONLY"_zv};
661 #include "pqxx/internal/compiler-internal-post.hxx" std::string quote_raw(unsigned char const bin[], std::size_t len) const
Binary-escape and quote a binary string for use as an SQL constant.
Definition: transaction_base.hxx:177
row exec_params1(zview query, Args &&...args)
Definition: transaction_base.hxx:383
pqxx::internal::c_params make_c_params() const
For internal use: Generate a params object for use in calls.
Definition: params.cxx:93
std::string unesc_raw(char const *text) const
Unescape binary data, e.g. from a table field or notification payload.
Definition: transaction_base.hxx:161
result exec_prepared_n(result::size_type rows, zview statement, Args &&...args)
Execute a prepared statement, expect a result with given number of rows.
Definition: transaction_base.hxx:469
Internal items for libpqxx' own use. Do not use these yourself.
Definition: composite.hxx:73
std::string quote_name(std::string_view identifier) const
Escape an SQL identifier for use in a query.
Definition: transaction_base.hxx:188
std::string_view name() const noexcept
Transaction name, if you passed one to the constructor; or empty string.
Definition: transaction_base.hxx:511
Base class for things that monopolise a transaction's attention.
Definition: transaction_focus.hxx:27
std::string esc(char const text[], std::size_t maxlen) const
Escape string for use as SQL string literal in this transaction.
Definition: transaction_base.hxx:116
result exec_params0(zview query, Args &&...args)
Definition: transaction_base.hxx:391
reference front() const noexcept
Definition: row.cxx:54
Error in usage of libpqxx library, similar to std::logic_error.
Definition: except.hxx:164
Result set containing data returned by a query or command.
Definition: result.hxx:70
Definition: connection.hxx:97
const zview begin_cmd
The SQL command for starting a given type of transaction.
Marker for stream_from constructors: "stream from query.".
Definition: types.hxx:63
The home of all libpqxx classes, functions, templates, etc.
Definition: array.hxx:25
std::string esc_raw(unsigned char const data[], std::size_t len) const
Escape binary data for use as SQL string literal in this transaction.
Definition: transaction_base.hxx:139
result exec_prepared(zview statement, Args &&...args)
Execute a prepared statement, with optional arguments.
Definition: transaction_base.hxx:439
transaction_base(connection &c, std::string_view tname, std::shared_ptr< std::string > rollback_cmd)
Create a transaction (to be called by implementation classes only).
Definition: transaction_base.hxx:518
void process_notice(zview msg) const
Have connection process a warning message.
Definition: transaction_base.hxx:485
result exec_params_n(std::size_t rows, zview query, Args &&...args)
Definition: transaction_base.hxx:400
std::string quote(T const &t) const
Represent object as SQL string, including quoting & escaping.
Definition: transaction_base.hxx:168
Reference to one row in a result.
Definition: row.hxx:45
auto stream(std::string_view query)
Execute a query, and loop over the results row by row.
Definition: transaction_base.hxx:338
row exec1(zview query, std::string_view desc=std::string_view{})
Execute command returning a single row of data.
Definition: transaction_base.hxx:260
connection & conn() const
The connection in which this transaction lives.
Definition: transaction_base.hxx:489
row exec_prepared1(zview statement, Args &&...args)
Execute a prepared statement, and expect a single-row result.
Definition: transaction_base.hxx:449
result_size_type size_type
Definition: result.hxx:73
std::string esc_like(std::string_view bin, char escape_char='\\') const
Escape string for literal LIKE match.
Definition: transaction_base.hxx:195
Interface definition (and common code) for "transaction" classes.
Definition: transaction_base.hxx:74
void set_rollback_cmd(std::shared_ptr< std::string > cmd)
Set the rollback command.
Definition: transaction_base.hxx:551
result exec_prepared0(zview statement, Args &&...args)
Execute a prepared statement, and expect a result with zero rows.
Definition: transaction_base.hxx:458
TYPE query_value(zview query, std::string_view desc=std::string_view{})
Perform query, expecting exactly 1 row with 1 field, and convert it.
Definition: transaction_base.hxx:280
Connection to a database.
Definition: connection.hxx:183
Build a parameter list for a parameterised or prepared statement.
Definition: prepared_statement.hxx:121
Marker-type wrapper: zero-terminated std::string_view.
Definition: zview.hxx:37
result exec0(zview query, std::string_view desc=std::string_view{})
Execute command, which should return zero rows of data.
Definition: transaction_base.hxx:248
std::string unesc_raw(zview text) const
Unescape binary data, e.g. from a table field or notification payload.
Definition: transaction_base.hxx:152
result exec(std::stringstream const &query, std::string_view desc=std::string_view{})
Execute a command.
Definition: transaction_base.hxx:236
std::string esc(std::string_view text) const
Escape string for use as SQL string literal in this transaction.
Definition: transaction_base.hxx:121