Python 操作 Oracle 数据库（cx_Oracle）
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- Oracle 数据库数据类型
- Engine Configuration
- oracle错误 ORA-01400: 无法将 NULL 插入 (“ROOT”.”TASK”.”ID”)的解决方案
- 64-bit Oracle Client library cannot be loaded.md
- python 连接 Oracle 插入中文乱码问题（cx_Oracle）
- python 关于为datatime 对象添加时区信息以及时区转换问题
- 更多错误提示链接
Oracle 数据库数据类型
----创建TF_B_AIR_CONFIG表
create table ECS_STORE.TF_B_AIR_CONFIG(
TYPE_ID VARCHAR2(20) not null,
PROVINCE_CODE VARCHAR2(4) not null,
PARAMETER_TYPE VARCHAR2(2) not null,
LIMIT_NUM VARCHAR2(4) not null,
EFFECTIVE_FALG VARCHAR2(2) default '1',
UPDATE_TIME DATE default sysdate,
constraint TF_B_AIR_CONFIG_PK primary key(TYPE_ID , PROVINCE_CODE)--复合主键
)
def table_exists(cursor,table_name): #这个函数用来判断表是否存在
stmt = "select Table_name from user_tables"
cursor.execute(stmt)
tables = cursor.fetchall()
# table_list = re.findall('(\'.*?\')',str(tables)) #('OL$NODES',)
# table_list = [re.sub("'",'',each) for each in table_list] # "'LOGMNR_SESSION_EVOLVE$'"
# tables = [table[0].strip("'") for table in tables]
tables = {table[0].strip("'") for table in tables}
if table_name.upper() in tables:
return 1 #存在返回1
else:
return 0Engine Configuration
Engine Configuration
engine = create_engine('oracle://scott:[email protected]:1521/sidname')
engine = create_engine('oracle+cx_oracle://scott:tiger@tnsname')更多请见：
Oracle
oracle错误 ORA-01400: 无法将 NULL 插入 (“ROOT”.”TASK”.”ID”)的解决方案
-- Create sequence
create sequence SEQ_NEW_PREDICT_201809
minvalue 1 -- 最小值=1
maxvalue 999999999999999999999999999 -- 指定最大值
-- 或nomaxvalue -- 没有最大值
-- NOCYCLE; -- 不循环
start with 1 -- 从1开始
increment by 1 -- 每次递增1
cache 20;
--触发器
create or replace trigger TRI_NEW_PREDICT_201809
before insert on NEW_PREDICT_201809
REFERENCING OLD AS "OLD" NEW AS "NEW" FOR EACH ROW
begin
SELECT SEQ_NEW_PREDICT_201809.NEXTVAL INTO :NEW.ID FROM DUAL;
end;64-bit Oracle Client library cannot be loaded.md
Download an Oracle 12.2 “Basic” or “Basic Light” zip file: 64-bit matching your application architecture.
Unzip the package into a single directory that is accessible to your application. For example:
mkdir -p /opt/oracle
cd /opt/oracle
unzip instantclient-basic-linux.x64-12.2.0.1.0.zipInstall the libaio package with sudo or as the root user. For example:
sudo apt-get install libaio1set the environment variable LD_LIBRARY_PATH to the appropriate directory for the Instant Client version. For example:
vi ~/.bashrc export LD_LIBRARY_PATH=/opt/oracle/instantclient_12_2:$LD_LIBRARY_PATHsource ~/.bashrcpython 连接 Oracle 插入中文乱码问题（cx_Oracle）
用python连接Oracle是总是乱码，最后发现时oracle客户端的字符编码设置不对。
编写的python脚本中需要加入如下几句：
import os
os.environ['NLS_LANG'] = 'SIMPLIFIED CHINESE_CHINA.UTF8'这样可以保证select出来的中文显示没有问题。
客户端的NLS_LANG设置及编码转换
①在Oracle客户端向服务器端提交SQL语句时，Oracle客户端根据NLS_LANG和数据库字符集，对从应用程序接传送过来的字符串编码进行转换处理。如果NLS_LANG与数据库字符集相同，不作转换，否则要转换成数据库字符集并传送到服务器。服务器在接收到字符串编码之后，对于普通的CHAR或VARCHAR2类型，直接存储;对于NCHAR或NVARCHAR2类型，服务器端将其转换为国家字符集再存储。
python 关于为datatime 对象添加时区信息以及时区转换问题
from pytz import utc
from pytz import timezone
from datetime import datetime
cst_tz = timezone('Asia/Shanghai')
utc_tz = timezone('UTC')
now = datetime.now().replace(tzinfo=cst_tz)
#local_dt = cst_tz.localize(now, is_dst=None)
utctime = now.astimezone(utc)
print "now : %s"%now
print "format: %s"%now.strftime('%Y-%m-%d %H:%M:%S')
print "utc : %s"%utctime
utcnow = datetime.utcnow()
utcnow = utcnow.replace(tzinfo=utc_tz)
china = utcnow.astimezone(cst_tz)
print "utcnow: %s"%utcnow
print "format: %s"%utcnow.strftime('%Y-%m-%d %H:%M:%S')
print "china : %s"%china 更多错误提示链接
oracle错误(一) ORA-各种常见java.sql.SQLException小结