/*
This file is part of GNUnet
Copyright (C) 2016, 2017, 2020, 2021 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see .
SPDX-License-Identifier: AGPL3.0-or-later
*/
/**
* @file include/gnunet_pq_lib.h
* @brief helper functions for Postgres DB interactions
* @author Christian Grothoff
*/
#ifndef GNUNET_PQ_LIB_H
#define GNUNET_PQ_LIB_H
#include
#include "gnunet_util_lib.h"
#include "gnunet_db_lib.h"
/* ************************* pq_query_helper.c functions ************************ */
/**
* Function called to convert input argument into SQL parameters.
*
* @param cls closure
* @param data pointer to input argument
* @param data_len number of bytes in @a data (if applicable)
* @param[out] param_values SQL data to set
* @param[out] param_lengths SQL length data to set
* @param[out] param_formats SQL format data to set
* @param param_length number of entries available in the @a param_values, @a param_lengths and @a param_formats arrays
* @param[out] scratch buffer for dynamic allocations (to be done via #GNUNET_malloc()
* @param scratch_length number of entries left in @a scratch
* @return -1 on error, number of offsets used in @a scratch otherwise
*/
typedef int
(*GNUNET_PQ_QueryConverter) (void *cls,
const void *data,
size_t data_len,
void *param_values[],
int param_lengths[],
int param_formats[],
unsigned int param_length,
void *scratch[],
unsigned int scratch_length);
/**
* @brief Description of a DB query parameter.
*/
struct GNUNET_PQ_QueryParam
{
/**
* Function for how to handle this type of entry.
*/
GNUNET_PQ_QueryConverter conv;
/**
* Closure for @e conv.
*/
void *conv_cls;
/**
* Data or NULL.
*/
const void *data;
/**
* Size of @e data
*/
size_t size;
/**
* Number of parameters eaten by this operation.
*/
unsigned int num_params;
};
/**
* End of query parameter specification.
*/
#define GNUNET_PQ_query_param_end \
{ \
NULL, NULL, NULL, 0, 0 \
}
/**
* Generate query parameter to create a NULL value.
*
* @return query parameter to use to insert NULL into DB
*/
struct GNUNET_PQ_QueryParam
GNUNET_PQ_query_param_null (void);
/**
* Generate query parameter for a buffer @a ptr of
* @a ptr_size bytes.
*
* @param ptr pointer to the query parameter to pass
* @oaran ptr_size number of bytes in @a ptr
* @return query parameter to use
*/
struct GNUNET_PQ_QueryParam
GNUNET_PQ_query_param_fixed_size (const void *ptr,
size_t ptr_size);
/**
* Generate query parameter for a string.
*
* @param ptr pointer to the string query parameter to pass
* @return query parameter to use
*/
struct GNUNET_PQ_QueryParam
GNUNET_PQ_query_param_string (const char *ptr);
/**
* Generate fixed-size query parameter with size determined
* by variable type.
*
* @param x pointer to the query parameter to pass.
* @return query parameter to use
*/
#define GNUNET_PQ_query_param_auto_from_type(x) \
GNUNET_PQ_query_param_fixed_size ((x), sizeof(*(x)))
/**
* Generate query parameter for an RSA public key. The
* database must contain a BLOB type in the respective position.
*
* @param x the query parameter to pass.
* @return query parameter to use
*/
struct GNUNET_PQ_QueryParam
GNUNET_PQ_query_param_rsa_public_key (
const struct GNUNET_CRYPTO_RsaPublicKey *x);
/**
* Generate query parameter for an RSA signature. The
* database must contain a BLOB type in the respective position.
*
* @param x the query parameter to pass
* @return query parameter to use
*/
struct GNUNET_PQ_QueryParam
GNUNET_PQ_query_param_rsa_signature (
const struct GNUNET_CRYPTO_RsaSignature *x);
/**
* Generate query parameter for a relative time value.
* The database must store a 64-bit integer.
*
* @param x pointer to the query parameter to pass
* @return query parameter to use
*/
struct GNUNET_PQ_QueryParam
GNUNET_PQ_query_param_relative_time (const struct GNUNET_TIME_Relative *x);
/**
* Generate query parameter for an absolute time value.
* The database must store a 64-bit integer.
*
* @param x pointer to the query parameter to pass
* @return query parameter to use
*/
struct GNUNET_PQ_QueryParam
GNUNET_PQ_query_param_absolute_time (const struct GNUNET_TIME_Absolute *x);
/**
* Generate query parameter for an absolute time value.
* The database must store a 64-bit integer.
*
* @param x pointer to the query parameter to pass
* @return query parameter to use
*/
struct GNUNET_PQ_QueryParam
GNUNET_PQ_query_param_absolute_time_nbo (
const struct GNUNET_TIME_AbsoluteNBO *x);
/**
* Generate query parameter for an uint16_t in host byte order.
*
* @param x pointer to the query parameter to pass
* @return query parameter to use
*/
struct GNUNET_PQ_QueryParam
GNUNET_PQ_query_param_uint16 (const uint16_t *x);
/**
* Generate query parameter for an uint32_t in host byte order.
*
* @param x pointer to the query parameter to pass
* @return query parameter to use
*/
struct GNUNET_PQ_QueryParam
GNUNET_PQ_query_param_uint32 (const uint32_t *x);
/**
* Generate query parameter for an uint16_t in host byte order.
*
* @param x pointer to the query parameter to pass
* @return query parameter to use
*/
struct GNUNET_PQ_QueryParam
GNUNET_PQ_query_param_uint64 (const uint64_t *x);
/* ************************* pq_result_helper.c functions ************************ */
/**
* Extract data from a Postgres database @a result at row @a row.
*
* @param cls closure
* @param result where to extract data from
* @param int row to extract data from
* @param fname name (or prefix) of the fields to extract from
* @param[in,out] dst_size where to store size of result, may be NULL
* @param[out] dst where to store the result
* @return
* #GNUNET_YES if all results could be extracted
* #GNUNET_NO if the field was NULL
* #GNUNET_SYSERR if a result was invalid (non-existing field)
*/
typedef enum GNUNET_GenericReturnValue
(*GNUNET_PQ_ResultConverter)(void *cls,
PGresult *result,
int row,
const char *fname,
size_t *dst_size,
void *dst);
/**
* Function called to clean up memory allocated
* by a #GNUNET_PQ_ResultConverter.
*
* @param cls closure
* @param rd result data to clean up
*/
typedef void
(*GNUNET_PQ_ResultCleanup) (void *cls,
void *rd);
/**
* @brief Description of a DB result cell.
*/
struct GNUNET_PQ_ResultSpec
{
/**
* What is the format of the result?
*/
GNUNET_PQ_ResultConverter conv;
/**
* Function to clean up result data, NULL if cleanup is
* not necessary.
*/
GNUNET_PQ_ResultCleanup cleaner;
/**
* Closure for @e conv and @e cleaner.
*/
void *cls;
/**
* Destination for the data.
*/
void *dst;
/**
* Allowed size for the data, 0 for variable-size
* (in this case, the type of @e dst is a `void **`
* and we need to allocate a buffer of the right size).
*/
size_t dst_size;
/**
* Field name of the desired result.
*/
const char *fname;
/**
* Where to store actual size of the result.
*/
size_t *result_size;
/**
* True if NULL is allowed for a value in the database.
*/
bool is_nullable;
/**
* Points to a location where we should store
* "true" if the result found is NULL, and
* otherwise "false". Only used if @e is_nullable
* is true.
*/
bool *is_null;
};
/**
* End of result parameter specification.
*
* @return array last entry for the result specification to use
*/
#define GNUNET_PQ_result_spec_end \
{ \
NULL, NULL, NULL, NULL, 0, NULL, NULL \
}
/**
* Allow NULL value to be found in the database
* for the given value.
*
* @param rs result spec entry to modify
* @param[out] is_null location set to 'true' if the
* value was indeed NULL, set to 'false' if the
* value was non-NULL
* @return array entry for the result specification to use
*/
struct GNUNET_PQ_ResultSpec
GNUNET_PQ_result_spec_allow_null (struct GNUNET_PQ_ResultSpec rs,
bool *is_null);
/**
* Variable-size result expected.
*
* @param name name of the field in the table
* @param[out] dst where to store the result, allocated
* @param[out] sptr where to store the size of @a dst
* @return array entry for the result specification to use
*/
struct GNUNET_PQ_ResultSpec
GNUNET_PQ_result_spec_variable_size (const char *name,
void **dst,
size_t *sptr);
/**
* Fixed-size result expected.
*
* @param name name of the field in the table
* @param[out] dst where to store the result
* @param dst_size number of bytes in @a dst
* @return array entry for the result specification to use
*/
struct GNUNET_PQ_ResultSpec
GNUNET_PQ_result_spec_fixed_size (const char *name, void *dst, size_t dst_size);
/**
* We expect a fixed-size result, with size determined by the type of `* dst`
*
* @param name name of the field in the table
* @param dst point to where to store the result, type fits expected result size
* @return array entry for the result specification to use
*/
#define GNUNET_PQ_result_spec_auto_from_type(name, dst) \
GNUNET_PQ_result_spec_fixed_size (name, (dst), sizeof(*(dst)))
/**
* 0-terminated string expected.
*
* @param name name of the field in the table
* @param[out] dst where to store the result, allocated
* @return array entry for the result specification to use
*/
struct GNUNET_PQ_ResultSpec
GNUNET_PQ_result_spec_string (const char *name, char **dst);
/**
* RSA public key expected.
*
* @param name name of the field in the table
* @param[out] rsa where to store the result
* @return array entry for the result specification to use
*/
struct GNUNET_PQ_ResultSpec
GNUNET_PQ_result_spec_rsa_public_key (const char *name,
struct GNUNET_CRYPTO_RsaPublicKey **rsa);
/**
* RSA signature expected.
*
* @param name name of the field in the table
* @param[out] sig where to store the result;
* @return array entry for the result specification to use
*/
struct GNUNET_PQ_ResultSpec
GNUNET_PQ_result_spec_rsa_signature (const char *name,
struct GNUNET_CRYPTO_RsaSignature **sig);
/**
* Absolute time expected.
*
* @param name name of the field in the table
* @param[out] at where to store the result
* @return array entry for the result specification to use
*/
struct GNUNET_PQ_ResultSpec
GNUNET_PQ_result_spec_absolute_time (const char *name,
struct GNUNET_TIME_Absolute *at);
/**
* Relative time expected.
*
* @param name name of the field in the table
* @param[out] rt where to store the result
* @return array entry for the result specification to use
*/
struct GNUNET_PQ_ResultSpec
GNUNET_PQ_result_spec_relative_time (const char *name,
struct GNUNET_TIME_Relative *rt);
/**
* Absolute time expected.
*
* @param name name of the field in the table
* @param[out] at where to store the result
* @return array entry for the result specification to use
*/
struct GNUNET_PQ_ResultSpec
GNUNET_PQ_result_spec_absolute_time_nbo (const char *name,
struct GNUNET_TIME_AbsoluteNBO *at);
/**
* uint16_t expected.
*
* @param name name of the field in the table
* @param[out] u16 where to store the result
* @return array entry for the result specification to use
*/
struct GNUNET_PQ_ResultSpec
GNUNET_PQ_result_spec_uint16 (const char *name, uint16_t *u16);
/**
* uint32_t expected.
*
* @param name name of the field in the table
* @param[out] u32 where to store the result
* @return array entry for the result specification to use
*/
struct GNUNET_PQ_ResultSpec
GNUNET_PQ_result_spec_uint32 (const char *name, uint32_t *u32);
/**
* uint64_t expected.
*
* @param name name of the field in the table
* @param[out] u64 where to store the result
* @return array entry for the result specification to use
*/
struct GNUNET_PQ_ResultSpec
GNUNET_PQ_result_spec_uint64 (const char *name, uint64_t *u64);
/* ************************* pq.c functions ************************ */
/**
* Postgres context.
*/
struct GNUNET_PQ_Context;
/**
* Execute a prepared statement.
*
* @param db database context
* @param name name of the prepared statement
* @param params parameters to the statement
* @return postgres result
* @deprecated (should become an internal API)
*/
PGresult *
GNUNET_PQ_exec_prepared (struct GNUNET_PQ_Context *db,
const char *name,
const struct GNUNET_PQ_QueryParam *params);
/**
* Extract results from a query result according to the given specification.
*
* @param result result to process
* @param[in,out] rs result specification to extract for
* @param row row from the result to extract
* @return
* #GNUNET_YES if all results could be extracted
* #GNUNET_SYSERR if a result was invalid (non-existing field)
*/
enum GNUNET_GenericReturnValue
GNUNET_PQ_extract_result (PGresult *result,
struct GNUNET_PQ_ResultSpec *rs,
int row);
/**
* Free all memory that was allocated in @a rs during
* #GNUNET_PQ_extract_result().
*
* @param rs reult specification to clean up
*/
void
GNUNET_PQ_cleanup_result (struct GNUNET_PQ_ResultSpec *rs);
/* ******************** pq_eval.c functions ************** */
/**
* Check the @a result's error code to see what happened.
* Also logs errors.
*
* @param db database to execute the statement in
* @param statement_name name of the statement that created @a result
* @param result result to check
* @return status code from the result, mapping PQ status
* codes to `enum GNUNET_DB_QueryStatus`. Never
* returns positive values as this function does
* not look at the result set.
* @deprecated (low level, let's see if we can do with just the high-level functions)
*/
enum GNUNET_DB_QueryStatus
GNUNET_PQ_eval_result (struct GNUNET_PQ_Context *db,
const char *statement_name,
PGresult *result);
/**
* Execute a named prepared @a statement that is NOT a SELECT
* statement in @a connection using the given @a params. Returns the
* resulting session state.
*
* @param db database to execute the statement with
* @param statement_name name of the statement
* @param params parameters to give to the statement (#GNUNET_PQ_query_param_end-terminated)
* @return status code from the result, mapping PQ status
* codes to `enum GNUNET_DB_QueryStatus`. If the
* statement was a DELETE or UPDATE statement, the
* number of affected rows is returned; if the
* statement was an INSERT statement, and no row
* was added due to a UNIQUE violation, we return
* zero; if INSERT was successful, we return one.
*/
enum GNUNET_DB_QueryStatus
GNUNET_PQ_eval_prepared_non_select (struct GNUNET_PQ_Context *db,
const char *statement_name,
const struct GNUNET_PQ_QueryParam *params);
/**
* Function to be called with the results of a SELECT statement
* that has returned @a num_results results.
*
* @param cls closure
* @param result the postgres result
* @param num_result the number of results in @a result
*/
typedef void
(*GNUNET_PQ_PostgresResultHandler) (void *cls,
PGresult *result,
unsigned int num_results);
/**
* Execute a named prepared @a statement that is a SELECT statement
* which may return multiple results in @a connection using the given
* @a params. Call @a rh with the results. Returns the query
* status including the number of results given to @a rh (possibly zero).
* @a rh will not have been called if the return value is negative.
*
* @param db database to execute the statement with
* @param statement_name name of the statement
* @param params parameters to give to the statement (#GNUNET_PQ_query_param_end-terminated)
* @param rh function to call with the result set, NULL to ignore
* @param rh_cls closure to pass to @a rh
* @return status code from the result, mapping PQ status
* codes to `enum GNUNET_DB_QueryStatus`.
*/
enum GNUNET_DB_QueryStatus
GNUNET_PQ_eval_prepared_multi_select (struct GNUNET_PQ_Context *db,
const char *statement_name,
const struct GNUNET_PQ_QueryParam *params,
GNUNET_PQ_PostgresResultHandler rh,
void *rh_cls);
/**
* Execute a named prepared @a statement that is a SELECT statement
* which must return a single result in @a connection using the given
* @a params. Stores the result (if any) in @a rs, which the caller
* must then clean up using #GNUNET_PQ_cleanup_result() if the return
* value was #GNUNET_DB_STATUS_SUCCESS_ONE_RESULT. Returns the
* resulting session status.
*
* @param db database to execute the statement with
* @param statement_name name of the statement
* @param params parameters to give to the statement (#GNUNET_PQ_query_param_end-terminated)
* @param[in,out] rs result specification to use for storing the result of the query
* @return status code from the result, mapping PQ status
* codes to `enum GNUNET_DB_QueryStatus`.
*/
enum GNUNET_DB_QueryStatus
GNUNET_PQ_eval_prepared_singleton_select (struct GNUNET_PQ_Context *db,
const char *statement_name,
const struct
GNUNET_PQ_QueryParam *params,
struct GNUNET_PQ_ResultSpec *rs);
/* ******************** pq_prepare.c functions ************** */
/**
* Information needed to prepare a list of SQL statements using
* #GNUNET_PQ_prepare_statements().
*/
struct GNUNET_PQ_PreparedStatement
{
/**
* Name of the statement.
*/
const char *name;
/**
* Actual SQL statement.
*/
const char *sql;
/**
* Number of arguments included in @e sql.
*/
unsigned int num_arguments;
};
/**
* Terminator for prepared statement list.
*/
#define GNUNET_PQ_PREPARED_STATEMENT_END \
{ \
NULL, NULL, 0 \
}
/**
* Create a `struct GNUNET_PQ_PreparedStatement`.
*
* @param name name of the statement
* @param sql actual SQL statement
* @param num_args number of arguments in the statement
* @return initialized struct
*/
struct GNUNET_PQ_PreparedStatement
GNUNET_PQ_make_prepare (const char *name,
const char *sql,
unsigned int num_args);
/**
* Request creation of prepared statements @a ps from Postgres.
*
* @param db database to prepare the statements for
* @param ps #GNUNET_PQ_PREPARED_STATEMENT_END-terminated array of prepared
* statements.
* @return #GNUNET_OK on success,
* #GNUNET_SYSERR on error
*/
int
GNUNET_PQ_prepare_statements (struct GNUNET_PQ_Context *db,
const struct GNUNET_PQ_PreparedStatement *ps);
/* ******************** pq_exec.c functions ************** */
/**
* Information needed to run a list of SQL statements using
* #GNUNET_PQ_exec_statements().
*/
struct GNUNET_PQ_ExecuteStatement
{
/**
* Actual SQL statement.
*/
const char *sql;
/**
* Should we ignore errors?
*/
int ignore_errors;
};
/**
* Terminator for executable statement list.
*/
#define GNUNET_PQ_EXECUTE_STATEMENT_END \
{ \
NULL, GNUNET_SYSERR \
}
/**
* Create a `struct GNUNET_PQ_ExecuteStatement` where errors are fatal.
*
* @param sql actual SQL statement
* @return initialized struct
*/
struct GNUNET_PQ_ExecuteStatement
GNUNET_PQ_make_execute (const char *sql);
/**
* Create a `struct GNUNET_PQ_ExecuteStatement` where errors should
* be tolerated.
*
* @param sql actual SQL statement
* @return initialized struct
*/
struct GNUNET_PQ_ExecuteStatement
GNUNET_PQ_make_try_execute (const char *sql);
/**
* Request execution of an array of statements @a es from Postgres.
*
* @param pq database to execute the statements in
* @param es #GNUNET_PQ_PREPARED_STATEMENT_END-terminated array of prepared
* statements.
* @return #GNUNET_OK on success (modulo statements where errors can be ignored)
* #GNUNET_SYSERR on error
*/
int
GNUNET_PQ_exec_statements (struct GNUNET_PQ_Context *db,
const struct GNUNET_PQ_ExecuteStatement *es);
/* ******************** pq_connect.c functions ************** */
/**
* Create a connection to the Postgres database using @a config_str for the
* configuration. Initialize logging via GNUnet's log routines and disable
* Postgres's logger. Also ensures that the statements in @a load_path and @a
* es are executed whenever we (re)connect to the database, and that the
* prepared statements in @a ps are "ready". If statements in @es fail that
* were created with #GNUNET_PQ_make_execute(), then the entire operation
* fails.
*
* In @a load_path, a list of "$XXXX.sql" files is expected where $XXXX
* must be a sequence of contiguous integer values starting at 0000.
* These files are then loaded in sequence using "psql $config_str" before
* running statements from @e es. The directory is inspected again on
* reconnect.
*
* @param config_str configuration to use
* @param load_path path to directory with SQL transactions to run, can be NULL
* @param es #GNUNET_PQ_PREPARED_STATEMENT_END-terminated
* array of statements to execute upon EACH connection, can be NULL
* @param ps array of prepared statements to prepare, can be NULL
* @return NULL on error
*/
struct GNUNET_PQ_Context *
GNUNET_PQ_connect (const char *config_str,
const char *load_path,
const struct GNUNET_PQ_ExecuteStatement *es,
const struct GNUNET_PQ_PreparedStatement *ps);
/**
* Connect to a postgres database using the configuration
* option "CONFIG" in @a section. Also ensures that the
* statements in @a es are executed whenever we (re)connect to the
* database, and that the prepared statements in @a ps are "ready".
*
* The caller does not have to ensure that @a es and @a ps remain allocated
* and initialized in memory until #GNUNET_PQ_disconnect() is called, as a copy will be made.
*
* @param cfg configuration
* @param section configuration section to use to get Postgres configuration options
* @param load_path_suffix suffix to append to the SQL_DIR in the configuration
* @param es #GNUNET_PQ_PREPARED_STATEMENT_END-terminated
* array of statements to execute upon EACH connection, can be NULL
* @param ps array of prepared statements to prepare, can be NULL
* @return the postgres handle, NULL on error
*/
struct GNUNET_PQ_Context *
GNUNET_PQ_connect_with_cfg (const struct GNUNET_CONFIGURATION_Handle *cfg,
const char *section,
const char *load_path_suffix,
const struct GNUNET_PQ_ExecuteStatement *es,
const struct GNUNET_PQ_PreparedStatement *ps);
/**
* Reinitialize the database @a db if the connection is down.
*
* @param db database connection to reinitialize
*/
void
GNUNET_PQ_reconnect_if_down (struct GNUNET_PQ_Context *db);
/**
* Reinitialize the database @a db.
*
* @param db database connection to reinitialize
*/
void
GNUNET_PQ_reconnect (struct GNUNET_PQ_Context *db);
/**
* Poll for database events now. Used if the event FD
* is ready and the application wants to trigger applicable
* events.
* Useful if the GNUnet scheduler is NOT to be used for
* such notifications.
*
* @param db database handle
*/
void
GNUNET_PQ_event_do_poll (struct GNUNET_PQ_Context *db);
/**
* Register callback to be invoked on events of type @a es.
*
* Unlike many other calls, this function is thread-safe
* and may be called from threads that are different
* from the one that setup @a db. However, the @a cb
* will always be called from the thread that runs
* #GNUNET_PQ_event_do_poll() or the GNUnet scheduler.
*
* @param db database context to use
* @param es specification of the event to listen for
* @param timeout when to trigger @a cb based on timeout
* @param cb function to call when the event happens, possibly
* multiple times (until #GNUNET_PQ_event_listen_cancel() is invoked), including on timeout
* @param cb_cls closure for @a cb
* @return handle useful to cancel the listener
*/
struct GNUNET_DB_EventHandler *
GNUNET_PQ_event_listen (struct GNUNET_PQ_Context *db,
const struct GNUNET_DB_EventHeaderP *es,
struct GNUNET_TIME_Relative timeout,
GNUNET_DB_EventCallback cb,
void *cb_cls);
/**
* Stop notifications.
*
* Unlike many other calls, this function is thread-safe
* and may be called from threads that are different
* from the one that setup @a db. However, the @a cb
* will always be called from the thread that runs
* #GNUNET_PQ_event_do_poll() or the GNUnet scheduler.
*
* @param eh handle to unregister.
*/
void
GNUNET_PQ_event_listen_cancel (struct GNUNET_DB_EventHandler *eh);
/**
* Notify all that listen on @a es of an event.
*
* Unlike many other calls, this function is thread-safe
* and may be called from threads that are different
* from the one that setup @a db. However, the @a cb
* will always be called from the thread that runs
* #GNUNET_PQ_event_do_poll() or the GNUnet scheduler.
*
* @param db database context to use
* @param es specification of the event to generate
* @param extra additional event data provided
* @param extra_size number of bytes in @a extra
*/
void
GNUNET_PQ_event_notify (struct GNUNET_PQ_Context *db,
const struct GNUNET_DB_EventHeaderP *es,
const void *extra,
size_t extra_size);
/**
* Within the @a db context, run all the SQL files
* from the @a load_path from 0000-9999.sql (as long
* as the files exist contiguously).
*
* @param db database context to use
* @param load_path where to find the XXXX.sql files
* @return #GNUNET_OK on success
*/
enum GNUNET_GenericReturnValue
GNUNET_PQ_run_sql (struct GNUNET_PQ_Context *db,
const char *load_path);
/**
* Disconnect from the database, destroying the prepared statements
* and releasing other associated resources.
*
* @param db database handle to disconnect (will be free'd)
*/
void
GNUNET_PQ_disconnect (struct GNUNET_PQ_Context *db);
#endif /* GNUNET_PQ_LIB_H_ */
/* end of include/gnunet_pq_lib.h */