JThreadVariables Struct Reference

The JThreadVariables struct bundles the thread-local DB connection, the query cache and the schema cache. More...

#include <sql-generic-internal.h>

Data Fields
gpointer	db_connection
	The backend-specific database connection handle. More...
GHashTable *	query_cache
	Cache for prepared statements. More...
GHashTable *	schema_cache
	Cache for schemas. More...

Detailed Description

The JThreadVariables struct bundles the thread-local DB connection, the query cache and the schema cache.

Field Documentation

db_connection

gpointer JThreadVariables::db_connection

The backend-specific database connection handle.

query_cache

GHashTable* JThreadVariables::query_cache

Cache for prepared statements.

sql or keyword(char*) -> (JSqlStatement*) Caching prepared statements enables different DB backend server-side optimizations. Each thread maintains its own cache because the statments likely depend on the (thread-private) DB connection object.

schema_cache

GHashTable* JThreadVariables::schema_cache

Cache for schemas.

namespace_name(char*) -> (GHashTable* (full variable name(char*) -> JDBType(directly as int))) A thread local schema cache. The schema information is stored in a hash table that maps the full field name to the respectove JDBType. The keys are correctly quoted and can be used as part of SQL strings.

---

The documentation for this struct was generated from the following file:

• lib/db-util/sql-generic-internal.h