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pgsql-id-tracker.cpp
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pgsql-id-tracker.cpp
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#include "pgsql-id-tracker.hpp"
#include <libpq-fe.h>
#include <string>
#include <boost/format.hpp>
#include "osmtypes.hpp"
#include "pgsql.hpp"
#include "util.hpp"
struct pgsql_id_tracker::pimpl {
pimpl(const std::string &conninfo,
const std::string &prefix,
const std::string &type,
bool owns_table);
~pimpl();
PGconn *conn;
std::string table_name;
bool owns_table;
osmid_t old_id;
};
pgsql_id_tracker::pimpl::pimpl(const std::string &conninfo,
const std::string &prefix,
const std::string &type,
bool owns_table_)
: conn(PQconnectdb(conninfo.c_str())),
table_name((boost::format("%1%_%2%") % prefix % type).str()),
owns_table(owns_table_),
old_id(0) {
if (PQstatus(conn) != CONNECTION_OK) {
fprintf(stderr, "Connection to database failed: %s\n", PQerrorMessage(conn));
util::exit_nicely();
}
if (owns_table) {
pgsql_exec(conn, PGRES_COMMAND_OK,
"DROP TABLE IF EXISTS \"%s\"",
table_name.c_str());
pgsql_exec(conn, PGRES_COMMAND_OK,
"CREATE TABLE \"%s\" (id " POSTGRES_OSMID_TYPE ")",
table_name.c_str());
}
pgsql_exec(conn, PGRES_COMMAND_OK,
"PREPARE set_mark(" POSTGRES_OSMID_TYPE ") AS INSERT INTO \"%s\" (id) "
"SELECT $1 WHERE NOT EXISTS (SELECT id FROM \"%s\" WHERE id = $1)",
table_name.c_str(), table_name.c_str());
pgsql_exec(conn, PGRES_COMMAND_OK,
"PREPARE get_mark(" POSTGRES_OSMID_TYPE ") AS SELECT id FROM \"%s\" "
"WHERE id = $1",
table_name.c_str());
pgsql_exec(conn, PGRES_COMMAND_OK,
"PREPARE get_min AS SELECT min(id) AS id FROM \"%s\"",
table_name.c_str());
pgsql_exec(conn, PGRES_COMMAND_OK,
"PREPARE drop_mark(" POSTGRES_OSMID_TYPE ") AS DELETE FROM \"%s\" "
"WHERE id = $1",
table_name.c_str());
pgsql_exec(conn, PGRES_COMMAND_OK, "BEGIN");
}
pgsql_id_tracker::pimpl::~pimpl() {
if (conn) {
pgsql_exec(conn, PGRES_COMMAND_OK, "COMMIT");
if (owns_table) {
pgsql_exec(conn, PGRES_COMMAND_OK, "DROP TABLE \"%s\"", table_name.c_str());
}
PQfinish(conn);
}
conn = NULL;
}
pgsql_id_tracker::pgsql_id_tracker(const std::string &conninfo,
const std::string &prefix,
const std::string &type,
bool owns_table)
: impl() {
impl.reset(new pimpl(conninfo, prefix, type, owns_table));
}
pgsql_id_tracker::~pgsql_id_tracker() {
}
void pgsql_id_tracker::mark(osmid_t id) {
char tmp[16];
char const *paramValues[1];
snprintf(tmp, sizeof(tmp), "%" PRIdOSMID, id);
paramValues[0] = tmp;
pgsql_execPrepared(impl->conn, "set_mark", 1, paramValues, PGRES_COMMAND_OK);
}
bool pgsql_id_tracker::is_marked(osmid_t id) {
char tmp[16];
char const *paramValues[1] = {NULL};
PGresult *result = NULL;
snprintf(tmp, sizeof(tmp), "%" PRIdOSMID, id);
paramValues[0] = tmp;
result = pgsql_execPrepared(impl->conn, "get_mark", 1, paramValues, PGRES_TUPLES_OK);
bool done = PQntuples(result) > 0;
PQclear(result);
return done;
}
osmid_t pgsql_id_tracker::pop_mark() {
osmid_t id = std::numeric_limits<osmid_t>::max();
PGresult *result = NULL;
result = pgsql_execPrepared(impl->conn, "get_min", 0, NULL, PGRES_TUPLES_OK);
if ((PQntuples(result) == 1) &&
(PQgetisnull(result, 0, 0) == 0)) {
id = strtoosmid(PQgetvalue(result, 0, 0), NULL, 10);
}
PQclear(result);
if (id != std::numeric_limits<osmid_t>::max()) {
unmark(id);
}
assert((id > impl->old_id) || (id == std::numeric_limits<osmid_t>::max()));
impl->old_id = id;
return id;
}
void pgsql_id_tracker::unmark(osmid_t id) {
char tmp[16];
char const *paramValues[1] = {NULL};
snprintf(tmp, sizeof(tmp), "%" PRIdOSMID, id);
paramValues[0] = tmp;
pgsql_execPrepared(impl->conn, "drop_mark", 1, paramValues, PGRES_COMMAND_OK);
}
void pgsql_id_tracker::commit() {
if (impl->owns_table) {
pgsql_exec(impl->conn, PGRES_COMMAND_OK, "CREATE INDEX ON \"%s\" (id)", impl->table_name.c_str());
}
pgsql_exec(impl->conn, PGRES_COMMAND_OK, "COMMIT");
pgsql_exec(impl->conn, PGRES_COMMAND_OK, "BEGIN");
}
void pgsql_id_tracker::force_release() {
impl->owns_table = false;
impl->conn = NULL;
}