数据库中cx_oracle怎么用使用

发布时间：2021-11-18 15:34:42 作者：小新
来源：亿速云阅读：515

这篇文章给大家分享的是有关数据库中cx_oracle怎么用使用的内容。小编觉得挺实用的，因此分享给大家做个参考，一起跟随小编过来看看吧。

连接

import cx_Oracle

#使用tnsnames文件别名链接

# ora = cx_Oracle.connect('scott/tiger@orcl')

#使用字符串，传入一个参数链接

# ora = cx_Oracle.connect('scott/tiger@192.168.56.152:1521/orcl')

# 使用字符串，分别传入用户名密码等

# ora = cx_Oracle.connect('scott','tiger','192.168.56.152:1521/orcl')

# 使用dsn解析成tns字符串，连接数据库

# tnsname = cx_Oracle.makedsn('192.168.56.152','1521','orcl')

# ora = cx_Oracle.connect('scott','tiger',tnsname)

#使用sysdba或者其他角色链接

ora = cx_Oracle.connect('sys','oracle','192.168.56.152:1521/orcl',mode=cx_Oracle.SYSDBA)

cursor = ora.cursor()

#使用位置对应参数

cursor.execute('select * from scott.t1 where DEPTNO = :1',(10,))

print(cursor.fetchall())

cursor.close()

ora.close()

查询

#fetchall

import cx_Oracle

ora = cx_Oracle.connect('scott/tiger@192.168.56.152:1521/orcl')

cursor = ora.cursor()

cursor.execute('select * from emp')

print(cursor.fetchall())

cursor.close()

ora.close()

#fetchone

import cx_Oracle

ora = cx_Oracle.connect('scott/tiger@192.168.56.152:1521/orcl')

cursor = ora.cursor()

cursor.execute('select * from emp')

while 1:

res = cursor.fetchone()

if res == None:

break

print(res)

cursor.close()

ora.close()

#fetchmany

# 使用dsn解析成tns字符串，连接数据库

tnsname = cx_Oracle.makedsn('192.168.56.151','1521','orcl')

ora = cx_Oracle.connect('system','oracle',tnsname)

cursor = ora.cursor()

cursor.execute('select * from dba_objects')

resCount=0

while 1:

res = cursor.fetchmany(10)

if res == []:

break

print(res)

resCount += 10

cursor.close()

ora.close()

#使用绑定变量

import cx_Oracle

ora = cx_Oracle.connect('scott/tiger@192.168.56.152:1521/orcl')

cursor = ora.cursor()

#使用位置对应参数

cursor.execute('select * from t1 where DEPTNO = :1',(10,))

print(cursor.fetchall())

#使用字典传入参数

param={'dno':20}

cursor.execute('select * from t1 where DEPTNO = :dno',param)

print(cursor.fetchall())

cursor.execute('select * from t1 where DEPTNO = :dno or DNAME=:dn',dno=40,dn='ACCOUNTING')

print(cursor.fetchall())

cursor.close()

ora.close()

增、删、改数据和多次执行

import cx_Oracle

#使用tnsnames文件别名链接

# ora = cx_Oracle.connect('scott/tiger@orcl')

#使用字符串，传入一个参数链接

# ora = cx_Oracle.connect('scott/tiger@192.168.56.152:1521/orcl')

# 使用字符串，分别传入用户名密码等

# ora = cx_Oracle.connect('scott','tiger','192.168.56.152:1521/orcl')

# 使用dsn解析成tns字符串，连接数据库

tnsname = cx_Oracle.makedsn('192.168.56.152','1521','orcl')

ora = cx_Oracle.connect('scott','tiger',tnsname)

#使用sysdba或者其他角色链接

# ora = cx_Oracle.connect('sys','oracle','192.168.56.152:1521/orcl',mode=cx_Oracle.SYSDBA)

cursor = ora.cursor()

cursor.execute('insert into t1 values(50,:1,:2)',('DBA','CHINA')) #sql中使用参数

ora.commit()

cursor.execute('select * from t1')

while 1:

res = cursor.fetchone()

if res == None:

break

print(res)

cursor.close()

ora.close()

import cx_Oracle

#使用tnsnames文件别名链接

# ora = cx_Oracle.connect('scott/tiger@orcl')

#使用字符串，传入一个参数链接

# ora = cx_Oracle.connect('scott/tiger@192.168.56.152:1521/orcl')

# 使用字符串，分别传入用户名密码等

# ora = cx_Oracle.connect('scott','tiger','192.168.56.152:1521/orcl')

# 使用dsn解析成tns字符串，连接数据库

tnsname = cx_Oracle.makedsn('192.168.56.152','1521','orcl')

ora = cx_Oracle.connect('scott','tiger',tnsname)

#使用sysdba或者其他角色链接

# ora = cx_Oracle.connect('sys','oracle','192.168.56.152:1521/orcl',mode=cx_Oracle.SYSDBA)

cursor = ora.cursor()

cursor.prepare('update t1 set LOC=:loc where DEPTNO=:dno')

cursor.execute(None,{'loc':'BEIJING','dno':50}) #使用了prepare函数，在execute里面可以不传入sql语句，直接传入参数。注意：这里的第一个参数必须为None

ora.commit()

cursor.execute('select * from t1')

while 1:

res = cursor.fetchone()

if res == None:

break

print(res)

cursor.close()

ora.close()

import cx_Oracle

#使用tnsnames文件别名链接

# ora = cx_Oracle.connect('scott/tiger@orcl')

#使用字符串，传入一个参数链接

# ora = cx_Oracle.connect('scott/tiger@192.168.56.152:1521/orcl')

# 使用字符串，分别传入用户名密码等

# ora = cx_Oracle.connect('scott','tiger','192.168.56.152:1521/orcl')

# 使用dsn解析成tns字符串，连接数据库

tnsname = cx_Oracle.makedsn('192.168.56.152','1521','orcl')

ora = cx_Oracle.connect('scott','tiger',tnsname)

#使用sysdba或者其他角色链接

# ora = cx_Oracle.connect('sys','oracle','192.168.56.152:1521/orcl',mode=cx_Oracle.SYSDBA)

cursor = ora.cursor()

#执行多条语句

list1 = [(60,'Enginer','Sydney'),(70,'Diver','South Africa')]

cursor.prepare('insert into t1 values(:1,:2,:3)')

cursor.executemany(None,list1) #使用了prepare函数，在execute里面可以不传入sql语句，直接传入参数。注意：这里的第一个参数必须为None

ora.commit()

cursor.execute('select * from t1')

while 1:

res = cursor.fetchone()

if res == None:

break

print(res)

cursor.close()

ora.close()

调用函数和存储过程

#调用存储过程

cursor.callproc(name, parameters=[], keywordParameters={})

#调用函数

cursor.callfunc(name, returnType, parameters=[], keywordParameters={})

#cx_Oracle.STRING

cx_Oracle、Python的对象类型之间存在转换关系

Oracle	cx_Oracle	Python
VARCHAR2, NVARCHAR2, LONG	cx_Oracle.STRING	str
CHAR	cx_Oracle.FIXED_CHAR	str
NUMBER	cx_Oracle.NUMBER	int
FLOAT	cx_Oracle.NUMBER	float
DATE	cx_Oracle.DATETIME	datetime.datetime
TIMESTAMP	cx_Oracle.TIMESTAMP	datetime.datetime
CLOB	cx_Oracle.CLOB	cx_Oracle.LOB
BLOB	cx_Oracle.BLOB	cx_Oracle.LOB

获取中文乱码

import os

os.environ['NLS_LANG'] = 'SIMPLIFIED CHINESE_CHINA.UTF8’

#或者os.environ['NLS_LANG'] = 'AMERICAN_AMERICA.AL32UTF8'

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数据库中cx_oracle怎么用使用

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