author | Tero Marttila <terom@fixme.fi> |
Fri, 17 Oct 2008 02:04:03 +0300 | |
changeset 31 | 7804cd7b5cd5 |
parent 30 | d8fabd347a8e |
child 34 | 460f995d3769 |
permissions | -rw-r--r-- |
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#ifndef EVSQL_H |
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#define EVSQL_H |
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/* |
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* An event-based (Postgre)SQL client API using libevent |
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*/ |
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// XXX: libpq |
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#include <stdint.h> |
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#include <postgresql/libpq-fe.h> |
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#include <event2/event.h> |
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/* |
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* The generic context handle |
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*/ |
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struct evsql; |
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/* |
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* A query handle |
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*/ |
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struct evsql_query; |
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/* |
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* Transaction handle |
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*/ |
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struct evsql_trans; |
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/* |
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* Transaction type |
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*/ |
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enum evsql_trans_type { |
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EVSQL_TRANS_DEFAULT, |
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EVSQL_TRANS_SERIALIZABLE, |
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EVSQL_TRANS_REPEATABLE_READ, |
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EVSQL_TRANS_READ_COMMITTED, |
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EVSQL_TRANS_READ_UNCOMMITTED, |
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}; |
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/* |
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* Parameter type |
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*/ |
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enum evsql_param_format { |
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EVSQL_FMT_TEXT, |
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EVSQL_FMT_BINARY, |
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}; |
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enum evsql_param_type { |
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EVSQL_PARAM_INVALID, |
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EVSQL_PARAM_NULL_, |
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EVSQL_PARAM_BINARY, |
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EVSQL_PARAM_STRING, |
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EVSQL_PARAM_UINT16, |
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EVSQL_PARAM_UINT32, |
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EVSQL_PARAM_UINT64, |
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}; |
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/* |
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* Query parameter info. |
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* |
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* Use the EVSQL_PARAM_* macros to define the value of list |
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*/ |
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struct evsql_query_params { |
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// nonzero to get results in binary format |
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enum evsql_param_format result_fmt; |
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// the list of parameters, terminated by { 0, 0 } |
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struct evsql_query_param { |
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// the param type |
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enum evsql_param_type type; |
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// pointer to the raw data |
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const char *data_raw; |
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// the value |
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union { |
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uint16_t uint16; |
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uint32_t uint32; |
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uint64_t uint64; |
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} data; |
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// the explicit length of the parameter if it's binary, zero for text. |
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// set to -1 to indicate that the value is still missing |
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ssize_t length; |
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} list[]; |
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}; |
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// macros for defining evsql_query_params |
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#define EVSQL_PARAMS(result_fmt) { result_fmt, |
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#define EVSQL_PARAM(typenam) { EVSQL_PARAM_ ## typenam, NULL } |
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#define EVSQL_PARAMS_END { EVSQL_PARAM_INVALID, NULL } \ |
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} // <<< |
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/* |
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* Result type |
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*/ |
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struct evsql_result_info { |
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struct evsql *evsql; |
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struct evsql_trans *trans; |
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int error; |
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union evsql_result { |
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// libpq |
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PGresult *pq; |
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} result; |
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}; |
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/* |
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* Callback for handling query results. |
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* |
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* The query has completed, either succesfully or unsuccesfully (nonzero .error). |
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* |
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* Use the evsql_result_* functions to manipulate the results. |
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*/ |
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typedef void (*evsql_query_cb)(const struct evsql_result_info *res, void *arg); |
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/* |
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* Callback for handling global-level errors. |
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* |
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* The evsql is not useable anymore. |
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* |
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* XXX: this is not actually called yet, no retry logic implemented. |
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*/ |
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typedef void (*evsql_error_cb)(struct evsql *evsql, void *arg); |
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/* |
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* Callback for handling transaction-level errors. |
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* |
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* The transaction is not useable anymore. |
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*/ |
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typedef void (*evsql_trans_error_cb)(struct evsql_trans *trans, void *arg); |
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/* |
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* The transaction is ready for use. |
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*/ |
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typedef void (*evsql_trans_ready_cb)(struct evsql_trans *trans, void *arg); |
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/* |
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* The transaction was commited, and should not be used anymore. |
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*/ |
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typedef void (*evsql_trans_done_cb)(struct evsql_trans *trans, void *arg); |
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/* |
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* Create a new PostgreSQL/libpq(evpq) -based evsql using the given conninfo. |
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* |
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* The given conninfo must stay valid for the duration of the evsql's lifetime. |
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*/ |
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struct evsql *evsql_new_pq (struct event_base *ev_base, const char *pq_conninfo, evsql_error_cb error_fn, void *cb_arg); |
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/* |
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* Create a new transaction. |
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* |
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* Transactions are separate connections that provide transaction-isolation. |
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* |
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* Once the transaction is ready for use, ready_fn will be called. If the transaction fails, any pending query will be |
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* forgotten, and error_fn called. This also includes some (but not all) cases where evsql_query returns nonzero. |
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* |
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*/ |
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struct evsql_trans *evsql_trans (struct evsql *evsql, enum evsql_trans_type type, evsql_trans_error_cb error_fn, evsql_trans_ready_cb ready_fn, evsql_trans_done_cb done_fn, void *cb_arg); |
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/* |
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* Queue the given query for execution. |
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* |
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* If trans is specified (not NULL), then the transaction must be idle, and the query will be executed in that |
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* transaction's context. Otherwise, the query will be executed without a transaction, andmay be executed immediately, |
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* or if other similar queries are running, it will be queued for later execution. |
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* |
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* Once the query is complete (got a result, got an error, the connection failed), then the query_cb will be triggered. |
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*/ |
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struct evsql_query *evsql_query (struct evsql *evsql, struct evsql_trans *trans, const char *command, evsql_query_cb query_fn, void *cb_arg); |
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|
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/* |
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* Same as evsql_query, but uses the SQL-level support for binding parameters. |
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*/ |
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struct evsql_query *evsql_query_params (struct evsql *evsql, struct evsql_trans *trans, const char *command, const struct evsql_query_params *params, evsql_query_cb query_fn, void *cb_arg); |
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/* |
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* Abort a query, the query callback will not be called, the query and any possible results will be discarded. |
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* |
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* This does not garuntee that the query will not execute, simply that you won't get the results. |
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* |
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* If the query is part of a transaction, then trans must be given, and the query must be the query that is currently |
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* executing on that trans. The transaction's ready_fn will be called once the query has been aborted. |
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*/ |
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void evsql_query_abort (struct evsql_trans *trans, struct evsql_query *query); |
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/* |
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* Commit a transaction, calling done_fn if it was succesfull (error_fn otherwise). |
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* |
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* trans must be idle, just like for evsql_query. |
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* |
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* done_fn will never be called directly, always via the event loop. |
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* |
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* You cannot abort a COMMIT, calling trans_abort on trans after a succesful trans_commit is a FATAL error. |
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*/ |
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int evsql_trans_commit (struct evsql_trans *trans); |
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/* |
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* Abort a transaction, rolling it back. No callbacks will be called. |
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* |
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* You cannot abort a COMMIT, calling trans_abort on trans after a succesful trans_commit is a FATAL error. |
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*/ |
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void evsql_trans_abort (struct evsql_trans *trans); |
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/* |
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* Transaction-handling functions |
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*/ |
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// error string, meant to be called from evsql_trans_error_cb |
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const char *evsql_trans_error (struct evsql_trans *trans); |
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/* |
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* Param-building functions |
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*/ |
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int evsql_param_binary (struct evsql_query_params *params, size_t param, const char *ptr, size_t len); |
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int evsql_param_string (struct evsql_query_params *params, size_t param, const char *ptr); |
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int evsql_param_uint16 (struct evsql_query_params *params, size_t param, uint16_t uval); |
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int evsql_param_uint32 (struct evsql_query_params *params, size_t param, uint32_t uval); |
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int evsql_params_clear (struct evsql_query_params *params); |
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/* |
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* Query-handling functions |
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*/ |
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// print out a textual repr of the given query/params via DEBUG |
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void evsql_query_debug (const char *sql, const struct evsql_query_params *params); |
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/* |
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* Result-handling functions |
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*/ |
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// get error message associated with function |
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const char *evsql_result_error (const struct evsql_result_info *res); |
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// number of rows in the result |
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size_t evsql_result_rows (const struct evsql_result_info *res); |
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// number of columns in the result |
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size_t evsql_result_cols (const struct evsql_result_info *res); |
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// fetch the raw binary value from a result set, and return it via ptr |
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// if size is nonzero, check that the size of the field data matches |
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int evsql_result_binary (const struct evsql_result_info *res, size_t row, size_t col, const char **ptr, size_t *size, int nullok); |
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int evsql_result_string (const struct evsql_result_info *res, size_t row, size_t col, const char **ptr, int nullok); |
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// fetch certain kinds of values from a binary result set |
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int evsql_result_uint16 (const struct evsql_result_info *res, size_t row, size_t col, uint16_t *uval, int nullok); |
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int evsql_result_uint32 (const struct evsql_result_info *res, size_t row, size_t col, uint32_t *uval, int nullok); |
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int evsql_result_uint64 (const struct evsql_result_info *res, size_t row, size_t col, uint64_t *uval, int nullok); |
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// release the result set, freeing its memory |
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void evsql_result_free (const struct evsql_result_info *res); |
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// platform-dependant aliases |
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#define evsql_result_ushort evsql_result_uint16 |
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#if _LP64 |
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#define evsql_result_ulong evsql_result_uint64 |
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#else |
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#define evsql_result_ulong evsql_result_uint32 |
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#endif /* _LP64 */ |
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/* |
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* Close a connection. Callbacks for waiting queries will not be run. |
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* |
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* XXX: not implemented yet. |
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*/ |
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void evsql_close (struct evsql *evsql); |
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#endif /* EVSQL_H */ |