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18 * @brief functions to execute SQL statements with arguments and/or results (PostGres)
19 * @author Christian Grothoff
22 #include "gnunet_util_lib.h"
23 #include "gnunet_pq_lib.h"
27 * Error code returned by Postgres for deadlock.
29 #define PQ_DIAG_SQLSTATE_DEADLOCK "40P01"
32 * Error code returned by Postgres for uniqueness violation.
34 #define PQ_DIAG_SQLSTATE_UNIQUE_VIOLATION "23505"
37 * Error code returned by Postgres on serialization failure.
39 #define PQ_DIAG_SQLSTATE_SERIALIZATION_FAILURE "40001"
43 * Check the @a result's error code to see what happened.
46 * @param connection connection to execute the statement in
47 * @param statement_name name of the statement that created @a result
48 * @param result result to check
49 * @return status code from the result, mapping PQ status
50 * codes to `enum GNUNET_PQ_QueryStatus`. Never
51 * returns positive values as this function does
52 * not look at the result set.
53 * @deprecated (low level, let's see if we can do with just the high-level functions)
55 enum GNUNET_PQ_QueryStatus
56 GNUNET_PQ_eval_result (PGconn *connection,
57 const char *statement_name,
62 est = PQresultStatus (result);
63 if ( (PGRES_COMMAND_OK != est) &&
64 (PGRES_TUPLES_OK != est) )
68 sqlstate = PQresultErrorField (result,
72 /* very unexpected... */
74 return GNUNET_PQ_STATUS_HARD_ERROR;
76 if ( (0 == strcmp (sqlstate,
77 PQ_DIAG_SQLSTATE_DEADLOCK)) ||
78 (0 == strcmp (sqlstate,
79 PQ_DIAG_SQLSTATE_SERIALIZATION_FAILURE)) )
81 /* These two can be retried and have a fair chance of working
83 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO,
85 "Query `%s' failed with result: %s/%s/%s/%s/%s\n",
87 PQresultErrorField (result,
88 PG_DIAG_MESSAGE_PRIMARY),
89 PQresultErrorField (result,
90 PG_DIAG_MESSAGE_DETAIL),
91 PQresultErrorMessage (result),
92 PQresStatus (PQresultStatus (result)),
93 PQerrorMessage (connection));
94 return GNUNET_PQ_STATUS_SOFT_ERROR;
96 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
98 "Query `%s' failed with result: %s/%s/%s/%s/%s\n",
100 PQresultErrorField (result,
101 PG_DIAG_MESSAGE_PRIMARY),
102 PQresultErrorField (result,
103 PG_DIAG_MESSAGE_DETAIL),
104 PQresultErrorMessage (result),
105 PQresStatus (PQresultStatus (result)),
106 PQerrorMessage (connection));
107 return GNUNET_PQ_STATUS_HARD_ERROR;
109 return GNUNET_PQ_STATUS_SUCCESS_NO_RESULTS;
114 * Execute a named prepared @a statement that is NOT a SELECT
115 * statement in @a connnection using the given @a params. Returns the
116 * resulting session state.
118 * @param connection connection to execute the statement in
119 * @param statement_name name of the statement
120 * @param params parameters to give to the statement (#GNUNET_PQ_query_param_end-terminated)
121 * @return status code from the result, mapping PQ status
122 * codes to `enum GNUNET_PQ_QueryStatus`. Never
123 * returns positive values as this function does
124 * not look at the result set.
126 enum GNUNET_PQ_QueryStatus
127 GNUNET_PQ_eval_prepared_non_select (PGconn *connection,
128 const char *statement_name,
129 const struct GNUNET_PQ_QueryParam *params)
132 enum GNUNET_PQ_QueryStatus qs;
134 result = GNUNET_PQ_exec_prepared (connection,
137 qs = GNUNET_PQ_eval_result (connection,
146 * Execute a named prepared @a statement that is a SELECT statement
147 * which may return multiple results in @a connection using the given
148 * @a params. Call @a rh with the results. Returns the query
149 * status including the number of results given to @a rh (possibly zero).
150 * @a rh will not have been called if the return value is negative.
152 * @param connection connection to execute the statement in
153 * @param statement_name name of the statement
154 * @param params parameters to give to the statement (#GNUNET_PQ_query_param_end-terminated)
155 * @param rh function to call with the result set, NULL to ignore
156 * @param rh_cls closure to pass to @a rh
157 * @return status code from the result, mapping PQ status
158 * codes to `enum GNUNET_PQ_QueryStatus`.
160 enum GNUNET_PQ_QueryStatus
161 GNUNET_PQ_eval_prepared_multi_select (PGconn *connection,
162 const char *statement_name,
163 const struct GNUNET_PQ_QueryParam *params,
164 GNUNET_PQ_PostgresResultHandler rh,
168 enum GNUNET_PQ_QueryStatus qs;
171 result = GNUNET_PQ_exec_prepared (connection,
174 qs = GNUNET_PQ_eval_result (connection,
182 ret = PQntuples (result);
193 * Execute a named prepared @a statement that is a SELECT statement
194 * which must return a single result in @a connection using the given
195 * @a params. Stores the result (if any) in @a rs, which the caller
196 * must then clean up using #GNUNET_PQ_cleanup_result() if the return
197 * value was #GNUNET_PQ_STATUS_SUCCESS_ONE_RESULT. Returns the
198 * resulting session status.
200 * @param connection connection to execute the statement in
201 * @param statement_name name of the statement
202 * @param params parameters to give to the statement (#GNUNET_PQ_query_param_end-terminated)
203 * @param[in,out] rs result specification to use for storing the result of the query
204 * @return status code from the result, mapping PQ status
205 * codes to `enum GNUNET_PQ_QueryStatus`.
207 enum GNUNET_PQ_QueryStatus
208 GNUNET_PQ_eval_prepared_singleton_select (PGconn *connection,
209 const char *statement_name,
210 const struct GNUNET_PQ_QueryParam *params,
211 struct GNUNET_PQ_ResultSpec *rs)
214 enum GNUNET_PQ_QueryStatus qs;
216 result = GNUNET_PQ_exec_prepared (connection,
219 qs = GNUNET_PQ_eval_result (connection,
227 if (0 == PQntuples (result))
230 return GNUNET_PQ_STATUS_SUCCESS_NO_RESULTS;
232 if (1 != PQntuples (result))
234 /* more than one result, but there must be at most one */
237 return GNUNET_PQ_STATUS_HARD_ERROR;
240 GNUNET_PQ_extract_result (result,
245 return GNUNET_PQ_STATUS_HARD_ERROR;
248 return GNUNET_PQ_STATUS_SUCCESS_ONE_RESULT;
252 /* end of pq/pq_eval.c */