ProcessUtility_hook

中文定义与说明

供插件在 ProcessUtility() 中接管处理的钩子。

以下中文为本站依据所列 PostgreSQL 源码注释编译的说明。

接口声明

typedef void (*ProcessUtility_hook_type) (PlannedStmt *pstmt, const char *queryString, bool readOnlyTree, ProcessUtilityContext context, ParamListInfo params, QueryEnvironment *queryEnv, DestReceiver *dest, QueryCompletion *qc);
extern PGDLLIMPORT ProcessUtility_hook_type ProcessUtility_hook;

源码说明

此函数钩子变量允许可加载插件在 ProcessUtility 被调用时接管处理。插件通常应调用 standard_ProcessUtility()。

调用位置

• src/backend/tcop/utility.c:519

核心调用上下文：src/backend/tcop/utility.c:513–527

	/*
	 * We provide a function hook variable that lets loadable plugins get
	 * control when ProcessUtility is called.  Such a plugin would normally
	 * call standard_ProcessUtility().
	 */
	if (ProcessUtility_hook)
		(*ProcessUtility_hook) (pstmt, queryString, readOnlyTree,
								context, params, queryEnv,
								dest, qc);
	else
		standard_ProcessUtility(pstmt, queryString, readOnlyTree,
								context, params, queryEnv,
								dest, qc);
}