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Add query plan to DB profiling callback

This commit is contained in:
Julien BLACHE 2011-06-11 16:59:25 +02:00
parent 181b1e772f
commit a2b7b811b8
1 changed files with 51 additions and 2 deletions
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53
src/db.c
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@ -3675,8 +3675,57 @@ db_watch_enum_fetchwd(struct watch_enum *we, uint32_t *wd)
static void
db_xprofile(void *notused, const char *pquery, sqlite3_uint64 ptime)
{
DPRINTF(E_DBG, L_DB, "SQL PROFILE query: %s\n", pquery);
DPRINTF(E_DBG, L_DB, "SQL PROFILE time: %" PRIu64 "\n", (uint64_t)ptime);
sqlite3_stmt *stmt;
char *query;
int ret;
DPRINTF(E_DBG, L_DBPERF, "SQL PROFILE query: %s\n", pquery);
DPRINTF(E_DBG, L_DBPERF, "SQL PROFILE time: %" PRIu64 "\n", (uint64_t)ptime);
if ((strncmp(pquery, "SELECT", 6) != 0)
&& (strncmp(pquery, "UPDATE", 6) != 0)
&& (strncmp(pquery, "DELETE", 6) != 0))
return;
/* Disable profiling callback */
sqlite3_profile(hdl, NULL, NULL);
query = sqlite3_mprintf("EXPLAIN QUERY PLAN %s", pquery);
if (!query)
{
DPRINTF(E_DBG, L_DBPERF, "Query plan: Out of memory\n");
goto out;
}
ret = db_blocking_prepare_v2(query, -1, &stmt, NULL);
sqlite3_free(query);
if (ret != SQLITE_OK)
{
DPRINTF(E_DBG, L_DBPERF, "Query plan: Could not prepare statement: %s\n", sqlite3_errmsg(hdl));
goto out;
}
DPRINTF(E_DBG, L_DBPERF, "Query plan:\n");
while ((ret = db_blocking_step(stmt)) == SQLITE_ROW)
{
DPRINTF(E_DBG, L_DBPERF, "(%d,%d,%d) %s\n",
sqlite3_column_int(stmt, 0), sqlite3_column_int(stmt, 1), sqlite3_column_int(stmt, 2),
sqlite3_column_text(stmt, 3));
}
if (ret != SQLITE_DONE)
DPRINTF(E_DBG, L_DBPERF, "Query plan: Could not step: %s\n", sqlite3_errmsg(hdl));
DPRINTF(E_DBG, L_DBPERF, "---\n");
sqlite3_finalize(stmt);
out:
/* Reenable profiling callback */
sqlite3_profile(hdl, db_xprofile, NULL);
}
#endif