使用PyGreSQL操作PostgreSQL數據庫

openkk 12年前發布 | 32K 次閱讀 PostgreSQL 數據庫服務器

一、環境信息: 

   1、操作系統:

        RedHat Enterprise Linux 4

        Windows XP SP2

  2、數據庫:

        PostgreSQL8.3

  3、 開發工具:

        Eclipse+Pydev+python2.6+PyGreSQL(提供pg模塊)

  4、說明:

        a、PostgreSQL數據庫運行于RedHat Linux上,Windows下也要安裝pgAdmin(訪問PostgreSQL服務器的客戶端)。

        b、PyGreSQL(即pg)模塊下載路徑及API手冊:http://www.pygresql.org/

二、配置:

       1、將pgAdmin安裝路徑下以下子目錄添加到系統環境變量中:

             E:\Program Files\PostgreSQL\8.3\lib

             E:\Program Files\PostgreSQL\8.3\bin

       2、將python安裝目錄C:\Python26\Lib\site-packages\pywin32_system32下的dll文件拷貝到C:\WINDOWS\system32

       3、說明:

              a. 如果跳過以上兩步,在import pg時將會報錯,浪費較長時間才搞定。

              b. 如果對PostgreSQL安裝和配置不熟悉,請參考本博客中以下幾篇文章:

                  《RedHat Linux上安裝PostgreSQL》

                  《PostgreSQL服務端監聽設置及客戶端連接方法》

                  《PostgreSQL數據庫創建、刪除方法》

                   更多PostgreSQL相關知識請訪問從我的博客專欄:PostgreSQL系列

三、程序實現:

#!/usr/bin/env python
# -*- coding: utf-8 -*-

#導入日志及pg模塊
import logging
import logging.config
import pg

#日志配置文件名
LOG_FILENAME = 'logging.conf'

#日志語句提示信息
LOG_CONTENT_NAME = 'pg_log'

def log_init(log_config_filename, logname):
    '''
    Function:日志模塊初始化函數
    Input:log_config_filename:日志配置文件名
           lognmae:每條日志前的提示語句
    Output: logger
    author: socrates
    date:2012-02-12
    '''
    logging.config.fileConfig(log_config_filename)
    logger = logging.getLogger(logname)
    return logger

def operate_postgre_tbl_product():
    '''
    Function:操作pg數據庫函數
    Input:NONE
    Output: NONE
    author: socrates
    date:2012-02-12
    '''  
    pgdb_logger.debug("operate_postgre_tbl_product enter...") 

    #連接數據庫  
    try:
        pgdb_conn = pg.connect(dbname = 'kevin_test', host = '192.168.230.128', user = 'dyx1024', passwd = '888888')
    except Exception, e:
         print e.args[0]
         pgdb_logger.error("conntect postgre database failed, ret = %s" % e.args[0])    
         return    

    pgdb_logger.info("conntect postgre database(kevin_test) succ.") 

    #刪除表
    sql_desc = "DROP TABLE IF EXISTS tbl_product3;"
    try:
        pgdb_conn.query(sql_desc)
    except Exception, e:
        print 'drop table failed'
        pgdb_logger.error("drop table failed, ret = %s" % e.args[0])
        pgdb_conn.close()  
        return

    pgdb_logger.info("drop table(tbl_product3) succ.") 

    #創建表
    sql_desc = '''CREATE TABLE tbl_product3(
        i_index INTEGER,
        sv_productname VARCHAR(32)
        );'''
    try:    
        pgdb_conn.query(sql_desc)
    except Exception, e:
        print 'create table failed'
        pgdb_logger.error("create table failed, ret = %s" % e.args[0])
        pgdb_conn.close()  
        return        

    pgdb_logger.info("create table(tbl_product3) succ.") 

    #插入記錄   
    sql_desc = "INSERT INTO tbl_product3(sv_productname) values('apple')"
    try:
        pgdb_conn.query(sql_desc)
    except Exception, e:
        print 'insert record into table failed'
        pgdb_logger.error("insert record into table failed, ret = %s" % e.args[0])
        pgdb_conn.close()  
        return    

    pgdb_logger.info("insert record into table(tbl_product3) succ.")     

    #查詢表 1       
    sql_desc = "select * from tbl_product3"
    for row in pgdb_conn.query(sql_desc).dictresult():
        print row
        pgdb_logger.info("%s", row) 

    #查詢表2        
    sql_desc = "select * from tbl_test_port"
    for row in pgdb_conn.query(sql_desc).dictresult():
        print row 
        pgdb_logger.info("%s", row)        

    #關閉數據庫連接     
    pgdb_conn.close()       
    pgdb_logger.debug("operate_sqlite3_tbl_product leaving...") 

if __name__ == '__main__': 

    #初始化日志系統
    pgdb_logger = log_init(LOG_FILENAME, LOG_CONTENT_NAME)   

    #操作數據庫
    operate_postgre_tbl_product()
    
四、測試:

 1、運行后命令行打印結果:

{'sv_productname': 'apple', 'i_index': None}
{'i_status': 1, 'i_port': 2, 'i_index': 1}
{'i_status': 1, 'i_port': 3, 'i_index': 2}
{'i_status': 1, 'i_port': 5, 'i_index': 3}
{'i_status': 1, 'i_port': 0, 'i_index': 5}
{'i_status': 1, 'i_port': 18, 'i_index': 7}
{'i_status': 1, 'i_port': 8, 'i_index': 8}
{'i_status': 1, 'i_port': 7, 'i_index': 9}
{'i_status': 1, 'i_port': 21, 'i_index': 10}
{'i_status': 1, 'i_port': 23, 'i_index': 11}
{'i_status': 1, 'i_port': 29, 'i_index': 12}
{'i_status': 1, 'i_port': 3000, 'i_index': 4}
{'i_status': 1, 'i_port': 1999, 'i_index': 6}
 2、日志文件內容:
[2012-02-12 18:09:53,536  pg_log]DEBUG:  operate_postgre_tbl_product enter... (test_func.py:36)
[2012-02-12 18:09:53,772  pg_log]INFO:  conntect postgre database(kevin_test) succ. (test_func.py:46)
[2012-02-12 18:09:53,786  pg_log]INFO:  drop table(tbl_product3) succ. (test_func.py:58)
[2012-02-12 18:09:53,802  pg_log]INFO:  create table(tbl_product3) succ. (test_func.py:73)
[2012-02-12 18:09:53,802  pg_log]INFO:  insert record into table(tbl_product3) succ. (test_func.py:85)
[2012-02-12 18:09:53,802  pg_log]INFO:  {'sv_productname': 'apple', 'i_index': None} (test_func.py:91)
[2012-02-12 18:09:53,802  pg_log]INFO:  {'i_status': 1, 'i_port': 2, 'i_index': 1} (test_func.py:97)
[2012-02-12 18:09:53,802  pg_log]INFO:  {'i_status': 1, 'i_port': 3, 'i_index': 2} (test_func.py:97)
[2012-02-12 18:09:53,802  pg_log]INFO:  {'i_status': 1, 'i_port': 5, 'i_index': 3} (test_func.py:97)
[2012-02-12 18:09:53,802  pg_log]INFO:  {'i_status': 1, 'i_port': 0, 'i_index': 5} (test_func.py:97)
[2012-02-12 18:09:53,819  pg_log]INFO:  {'i_status': 1, 'i_port': 18, 'i_index': 7} (test_func.py:97)
[2012-02-12 18:09:53,819  pg_log]INFO:  {'i_status': 1, 'i_port': 8, 'i_index': 8} (test_func.py:97)
[2012-02-12 18:09:53,819  pg_log]INFO:  {'i_status': 1, 'i_port': 7, 'i_index': 9} (test_func.py:97)
[2012-02-12 18:09:53,819  pg_log]INFO:  {'i_status': 1, 'i_port': 21, 'i_index': 10} (test_func.py:97)
[2012-02-12 18:09:53,819  pg_log]INFO:  {'i_status': 1, 'i_port': 23, 'i_index': 11} (test_func.py:97)
[2012-02-12 18:09:53,819  pg_log]INFO:  {'i_status': 1, 'i_port': 29, 'i_index': 12} (test_func.py:97)
[2012-02-12 18:09:53,819  pg_log]INFO:  {'i_status': 1, 'i_port': 3000, 'i_index': 4} (test_func.py:97)
[2012-02-12 18:09:53,819  pg_log]INFO:  {'i_status': 1, 'i_port': 1999, 'i_index': 6} (test_func.py:97)
[2012-02-12 18:09:53,819  pg_log]DEBUG:  operate_sqlite3_tbl_product leaving... (test_func.py:101)
3、psql查看結果:
[root@kevin ~]# su - postgres
[postgres@kevin ~]$ psql -U dyx1024 -d kevin_test
psql (8.4.2)
Type "help" for help.

kevin_test=# \dt
                List of relations
 Schema |     Name      | Type  |     Owner      
--------+---------------+-------+----------------
 public | tbl_product3  | table | dyx1024
 public | tbl_test_port | table | pg_test_user_3
(2 rows)

kevin_test=# select * from tbl_product3;
 i_index | sv_productname 
---------+----------------
         | apple
(1 row)

kevin_test=# select * from tbl_test_port;
 i_index | i_port | i_status 
---------+--------+----------
       1 |      2 |        1
       2 |      3 |        1
       3 |      5 |        1
       5 |      0 |        1
       7 |     18 |        1
       8 |      8 |        1
       9 |      7 |        1
      10 |     21 |        1
      11 |     23 |        1
      12 |     29 |        1
       4 |   3000 |        1
       6 |   1999 |        1
(12 rows)

kevin_test=# \q
[postgres@kevin ~]$ 
來自:http://blog.csdn.net/dyx1024/article/details/7252816

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