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qc: Add qc_get_field_info

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This function returns more detailed information about the fields
of a statement. Supersedes qc_get_affected_fields() that will
be deprecated and removed.

Note that this function now introduced new kind of behaviour; the
returned data belongs to the GWBUF and remains valid for as long as
the GWBUF is alive. That means that unnecessary copying need not
be done.
This commit is contained in:
Johan Wikman
2016-11-01 16:34:28 +02:00
parent ab487e687f
commit c652f1330a
4 changed files with 73 additions and 0 deletions
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28
query_classifier/qc_sqlite/qc_sqlite.c
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@ -248,6 +248,21 @@ static bool ensure_query_is_parsed(GWBUF* query)
return parsed;
}
void free_field_infos(QC_FIELD_INFO* infos, size_t n_infos)
{
if (infos)
{
for (int i = 0; i < n_infos; ++i)
{
MXS_FREE(infos[i].database);
MXS_FREE(infos[i].table);
MXS_FREE(infos[i].column);
}
MXS_FREE(infos);
}
}
static void free_string_array(char** sa)
{
if (sa)
@ -2954,6 +2969,18 @@ static qc_query_op_t qc_sqlite_get_prepare_operation(GWBUF* query)
return op;
}
void qc_sqlite_get_field_info(GWBUF* stmt, const QC_FIELD_INFO** infos, size_t* n_infos)
{
QC_TRACE();
ss_dassert(this_unit.initialized);
ss_dassert(this_thread.initialized);
MXS_ERROR("qc_get_field_info not implemented yet.");
*infos = NULL;
*n_infos = 0;
}
/**
* EXPORTS
*/
@ -2979,6 +3006,7 @@ static QUERY_CLASSIFIER qc =
qc_sqlite_get_database_names,
qc_sqlite_get_prepare_name,
qc_sqlite_get_prepare_operation,
qc_sqlite_get_field_info,
};