这里(http://www.linuxidc.com/Linux/2012-02/54213.htm)写了使用python写了操作嵌入式数据库SQLite的方法,今天用python写了针对个人比较熟悉的开源数据库PostgreSQL的常用操作,开发过程简介如下:一、环境信息: 1、操作系统: RedHat Enterprise Linux 4 Windows XP SP2 2、数据库: PostgreSQL8.3 3、 开发工具: Eclipse+Pydev+python2.6+PyGreSQL(提供pg模块) 4、说明: a、PostgreSQL数据库运行于RedHat Linux上,Windows下也要安装pgAdmin(访问PostgreSQL服务器的客户端)。 b、PyGreSQL(即pg)模块下载路径及API手册:
http://www.pygresql.org/二、配置: 1、将pgAdmin安装路径下以下子目录添加到系统环境变量中: E:Program FilesPostgreSQL8.3lib E:Program FilesPostgreSQL8.3in 2、将python安装目录C:Python26Libsite-packagespywin32_system32下的dll文件拷贝到C:WINDOWSsystem32 3、说明:a. 如果跳过以上两步,在import pg时将会报错,浪费较长时间才搞定。b. 如果对PostgreSQL安装和配置不熟悉,请参考本博客中以下几篇文章:
《RedHat Linux上安装PostgreSQL》 http://www.linuxidc.com/Linux/2011-08/40521.htm《PostgreSQL服务端监听设置及客户端连接方法》 http://www.linuxidc.com/Linux/2011-08/40528.htm《PostgreSQL数据库创建、删除方法》 http://www.linuxidc.com/Linux/2011-08/40525.htm三、程序实现:
[python] view plaincopyprint?
- #!/usr/bin/env python
- # -*- coding: utf-8 -*-
-
- #导入日志及pg模块
- import logging
- import logging.config
- import pg
-
- #日志配置文件名
- LOG_FILENAME = "logging.conf"
-
- #日志语句提示信息
- LOG_CONTENT_NAME = "pg_log"
-
- def log_init(log_config_filename, logname):
- """""
- Function:日志模块初始化函数
- Input:log_config_filename:日志配置文件名
- lognmae:每条日志前的提示语句
- 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数据库函数
- Input:NONE
- Output: NONE
- author: socrates
- date:2012-02-12
- """
- pgdb_logger.debug("operate_postgre_tbl_product enter...")
-
- #连接数据库
- 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.")
-
- #删除表
- 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.")
-
- #创建表
- 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.")
-
- #插入记录
- 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.")
-
- #查询表 1
- sql_desc = "select * from tbl_product3"
- for row in pgdb_conn.query(sql_desc).dictresult():
- print row
- pgdb_logger.info("%s", row)
-
- #查询表2
- sql_desc = "select * from tbl_test_port"
- for row in pgdb_conn.query(sql_desc).dictresult():
- print row
- pgdb_logger.info("%s", row)
-
- #关闭数据库连接
- pgdb_conn.close()
- pgdb_logger.debug("operate_sqlite3_tbl_product leaving...")
-
- if __name__ == "__main__":
-
- #初始化日志系统
- pgdb_logger = log_init(LOG_FILENAME, LOG_CONTENT_NAME)
-
- #操作数据库
- operate_postgre_tbl_product()
-