Postgresql 中文操作指南 47. Server Programming Interface 47.3. Memory Management SPI_freeplan Postgresql 中文操作指南 SPI_freeplan SPI_freeplan — 释放先前保存的已预备语句 SPI_freeplan — free a previously saved prepared statement Synopsis int SPI_freeplan(SPIPlanPtr plan) Description SPI_freeplan 释放 SPI_prepare 之前返回的已预备语句，或 SPI_keepplan 或 SPI_saveplan 保存的已预备语句。 SPI_freeplan releases a prepared statement previously returned by SPI_prepare or saved by SPI_keepplan or SPI_saveplan. Arguments SPIPlanPtr _plan_ pointer to statement to free Return Value 成功时为 0；如果 plan 为 NULL 或无效，则为 SPI_ERROR_ARGUMENT 0 on success; SPI_ERROR_ARGUMENT if plan is NULL or invalid