index 179b5d05a470a9f59e13b73c9826edfed9fa184e..fb59c7c1ba5f8cf7c2d09e56295c74d6512d54e7 100644 (file)
--- a/src/include/core/store.h
+++ b/src/include/core/store.h
sdb_store_get_attr(sdb_store_obj_t *obj, const char *name, sdb_data_t *res,
sdb_store_matcher_t *filter);
sdb_store_get_attr(sdb_store_obj_t *obj, const char *name, sdb_data_t *res,
sdb_store_matcher_t *filter);
+/*
+ * Querying a store:
+ *
+ * - Query interface: A query is a formal description of an interaction with
+ * the store. It can be used, both, for read and write access. The query is
+ * described by its abstract syntax tree (AST). The parser package provides
+ * means to parse a string (SysQL) representation of the query into an AST.
+ *
+ * - Matcher / expression interface: This low-level interface provides direct
+ * control over how to access the store. It is used by the query
+ * implementation internally and can only be used for read access.
+ */
+
+/*
+ * sdb_store_query_t:
+ * A parsed query readily prepared for execution.
+ */
+struct sdb_store_query;
+typedef struct sdb_store_query sdb_store_query_t;
+
/*
* sdb_store_query_prepare:
* Prepare the query described by 'ast' for execution in a store.
*
* Returns:
/*
* sdb_store_query_prepare:
* Prepare the query described by 'ast' for execution in a store.
*
* Returns:
- * - a store matcher on success
+ * - a store query on success
* - NULL else
*/
* - NULL else
*/
-sdb_store_matcher_t *
+sdb_store_query_t *
sdb_store_query_prepare(sdb_ast_node_t *ast);
/*
sdb_store_query_prepare(sdb_ast_node_t *ast);
/*
* - a negative value on error
*/
int
* - a negative value on error
*/
int
-sdb_store_query_execute(sdb_store_matcher_t *m,
+sdb_store_query_execute(sdb_store_query_t *m,
sdb_strbuf_t *buf, sdb_strbuf_t *errbuf);
/*
sdb_strbuf_t *buf, sdb_strbuf_t *errbuf);
/*