Python模拟实现oracle的sqlplus工具源码
Python模拟实现oracle的sqlplus工具
团队计划开发数据库服务平台，需要用到一些服务器的脚本开发，为了了解python，给自己定了一个模拟sqlplus的小需求，然后去实现。
个人体会：python开发快捷，集成很多常用的公共包，对常用数据结构使用很方便，最大的缺点是版本较多，新版本不向前兼容，对AIX及HP-UNIX不太常用的OS也缺少直接支持。
以下是工具演示：
以下是源代码：
以下代码用的python版本是python2.7 http://www.python.org/
需要安装cx_Oracle开发包(python访问ORACLE用的) http://cx-oracle.sourceforge.net/
import cx_Oracle
import os
import sys
os.environ['NLS_LANG'] ='AMERICAN_AMERICA.ZHS16GBK';
connectresult=0;
promptstr="";
fetchsize=50;
#conn = cx_Oracle.connect('yzs/yzs@mydb');
print("------------Welcome To Python Sqlplus ----------------------");
print("| Version : 0.1");
print("| Author : MKing");
print("| Blog : http://blog.csdn.net/yzsind");
print("| Sina weibo : http://weibo.com/yzsind");
print("| Release Date: 2011-08-08");
print("| Login Example1:username/password@tnsname");
print("| Login Example2:username/password@host:port/dbname");
print("| Input exit to Quit");
print("-----------------------------------------------------------");
print("");
def getConnect(loginstr):
global connectresult
global promptstr
try:
connectresult=0;
promptstr="";
conn= cx_Oracle.connect(loginstr);
promptstr=conn.username+"@"+conn.dsn;
print("Database version:",conn.version);
print("Connected.");
connectresult=1;
return conn
except cx_Oracle.InterfaceError as exc:
error, = exc.args
print(exc);
except cx_Oracle.DatabaseError as exc:
error, = exc.args
print(error.message);
def getcolformatstr(coldef):
if coldef[1]==cx_Oracle.NUMBER:
formatstr='%12s';
else:
if coldef[2]<=32:
formatstr='%-'+str(coldef[2])+'s';
else:
formatstr='%-32s';
return formatstr
#########################################################################
while 1:
try:
loginstr=raw_input("login>").strip();
if loginstr=="" :
continue;
elif loginstr in ["exit","exit;"]:
print("...bye...");
exit();
conn = getConnect(loginstr);
if connectresult==1:
break;
except KeyboardInterrupt:
print("^C");
continue;
while 1:
sqlstr="";
try:
sqlstrline=raw_input(promptstr+">").strip();
if sqlstrline=="" :
continue;
elif sqlstrline.lower() in ["exit","exit;"]:
print("...bye...");
exit();
elif sqlstrline[0:7].lower()=="connect" :
conn = getConnect(sqlstrline[8:]);
elif sqlstrline.lower() in ["disconnect","disconnect;"] :
conn.close();
print("Connection closed.");
elif sqlstrline[0:4].lower()=="host" :
os.system(sqlstrline[4:])
else:
sqlstr=sqlstr+sqlstrline+'\n';
while sqlstrline[-1]!=";" :
sqlstrline=raw_input().strip();
sqlstr=sqlstr+sqlstrline+'\n';
sqlstr=sqlstr[0:len(sqlstr)-2]
try:
cursor = conn.cursor();
cursor.execute(sqlstr);
if sqlstr[0:6].lower()=="select" :
cols=[]
for col in cursor.description:
print(getcolformatstr(col) % (col[0])),
print('');
for col in cursor.description:
if col[1]==cx_Oracle.NUMBER:
print('-'*12),;
else:
if col[2]<=32:
print('-'*col[2]),;
else:
print('-'*32),;
print('');
recs = cursor.fetchmany(fetchsize);
while len(recs)>0:
for row in recs:
for i in range(len(row)):
if row[i]!=None:
print(getcolformatstr(cursor.description[i]) % row[i]),;
else:
print(getcolformatstr(cursor.description[i]) % ''),;
print('')
recs = cursor.fetchmany(fetchsize);
print(str(cursor.rowcount)+" rows selected.");
elif sqlstr[0:6].lower()=="insert" :
print(str(cursor.rowcount)+" rows inserted.");
elif sqlstr[0:6].lower()=="update" :
print(str(cursor.rowcount)+" rows updated.");
elif sqlstr[0:6].lower()=="delete" :
print(str(cursor.rowcount)+" rows deleted.");
elif sqlstr[0:5].lower()=="merge" :
print(str(cursor.rowcount)+" rows merged.");
elif sqlstr[0:6].lower()=="commit" :
print("Commit complete.");
elif sqlstr[0:6].lower()=="rollback" :
print("Rollback complete.");
else :
print("sql execute complete.");
except cx_Oracle.InterfaceError as exc:
error, = exc.args
print(exc);
except cx_Oracle.DatabaseError as exc:
error, = exc.args
print(error.message);
except KeyboardInterrupt:
print("^C");
continue;