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#include "pqxx/libcompiler.h"
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#include <map>
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#include <string>
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#include "pqxx/transaction_base"
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namespace pqxx
00031 {
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00057 class PQXX_LIBEXPORT pipeline :
public internal::transactionfocus
00058 {
00059
public:
00060 typedef long query_id;
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explicit pipeline(
transaction_base &,
const PGSTD::string &PName=
"");
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00064 ~pipeline() throw ();
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00072 query_id insert(const PGSTD::string &);
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void complete();
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void flush();
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bool is_finished(query_id) const;
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00093 result retrieve(query_id qid)
00094 {
return retrieve(m_queries.find(qid)).second; }
00095
00097 PGSTD::pair<query_id, result> retrieve();
00098
00099 bool empty() const throw () {
return m_queries.empty(); }
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int retain(
int retain_max=2);
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void resume();
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private:
00109
void invariant() const;
00110
00111 class Query
00112 {
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public:
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explicit Query(
const PGSTD::string &q) : m_query(q), m_res() {}
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const result &get_result() const throw () {
return m_res; }
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void set_result(
const result &r)
throw () { m_res = r; }
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const PGSTD::string &get_query() const throw () {
return m_query; }
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private:
00121 PGSTD::string m_query;
00122 result m_res;
00123 };
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typedef PGSTD::map<query_id,Query> QueryMap;
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static query_id qid_limit() throw ()
00129 {
00130
#ifdef _MSC_VER
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return LONG_MAX;
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#else
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return PGSTD::numeric_limits<query_id>::max();
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#endif
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}
00136
00138 query_id generate_id();
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00140
bool have_pending() const throw ()
00141 {
return m_issuedrange.second != m_issuedrange.first; }
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void issue();
00144
00146
void set_error_at(query_id qid)
throw () {
if (qid < m_error) m_error = qid; }
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void internal_error(
const PGSTD::string &err)
throw (PGSTD::logic_error);
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bool obtain_result(
bool expect_none=
false);
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void obtain_dummy();
00153
void get_further_available_results();
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void check_end_results();
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void receive_if_available();
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void receive(QueryMap::const_iterator stop);
00161 PGSTD::pair<query_id, result> retrieve(QueryMap::iterator);
00162
00163 QueryMap m_queries;
00164 PGSTD::pair<QueryMap::iterator,QueryMap::iterator> m_issuedrange;
00165
int m_retain;
00166
int m_num_waiting;
00167 query_id m_q_id;
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bool m_dummy_pending;
00171
00173 query_id m_error;
00174
00176 pipeline(
const pipeline &);
00178 pipeline &operator=(
const pipeline &);
00179 };
00180
00181
00182 }
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00184