对PostgreSQL SPI_finish的理解

[作者：技术者高健@博客园  mail: luckyjackgao@gmail.com ]

参考这个例子：

http://www.postgresql.org/docs/9.1/static/spi-examples.html

如果我们在 src/backend/executor/spi.c 的  SPI_finish 函数处进行调试（增加打印 SPI_finish called）可以发现，

如果不在SPI 程序中调用 SPI_finish,其实会有问题。

启动PostgreSQL:

[root@localhost ~]# su - postgres
[postgres@localhost ~]$ cd /usr/local/pgsql/bin
[postgres@localhost bin]$ ./postgres -D /usr/local/pgsql/data
LOG:  database system was shut down at 2012-10-29 09:27:55 CST
LOG:  autovacuum launcher started
LOG:  database system is ready to accept connections

调用 execq函数：

postgres=# create or replace function execq(text,integer) returns integer as '/usr/local/pgsql/lib/execq.so','execq' language c strict;
CREATE FUNCTION
postgres=# select execq('select * from testtab',10);
INFO:  EXECQ:  1 | 12345 
WARNING:  transaction left non-empty SPI stack
HINT:  Check for missing "SPI_finish" calls.
 execq 
-------
     1
(1 row)

postgres=# 

[作者：技术者高健@博客园  mail: luckyjackgao@gmail.com ]

结束