How to use cx_oracle in database
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Connect
Import cx_Oracle
# use tnsnames file alias links
# ora = cx_Oracle.connect ('scott/tiger@orcl')
# use a string and pass in a parameter link
# ora = cx_Oracle.connect ('scott/tiger@192.168.56.152:1521/orcl')
# using strings, passing in usernames, passwords, etc.
# ora = cx_Oracle.connect ('scott','tiger','192.168.56.152:1521/orcl')
# use dsn to parse into tns strings and connect to the database
# tnsname = cx_Oracle.makedsn ('192.168.56.152 (' 192.168.56.152)
# ora = cx_Oracle.connect ('scott','tiger',tnsname)
# use sysdba or other role links
Ora = cx_Oracle.connect ('sys','oracle','192.168.56.152:1521/orcl',mode=cx_Oracle.SYSDBA)
Cursor = ora.cursor ()
# use location corresponding parameters
Cursor.execute ('select * from scott.t1 where DEPTNO =: 1, (10,))
Print (cursor.fetchall ())
Cursor.close ()
Ora.close ()
Query
# 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
# use dsn to parse into tns strings and connect to the database
Tnsname = cx_Oracle.makedsn ('192.168.56.151)
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 ()
# using bind variables
Import cx_Oracle
Ora = cx_Oracle.connect ('scott/tiger@192.168.56.152:1521/orcl')
Cursor = ora.cursor ()
# use location corresponding parameters
Cursor.execute ('select * from T1 where DEPTNO =: 1, (10,))
Print (cursor.fetchall ())
# pass in parameters using a dictionary
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 ()
Add, delete, change data and execute multiple times
Import cx_Oracle
# use tnsnames file alias links
# ora = cx_Oracle.connect ('scott/tiger@orcl')
# use a string and pass in a parameter link
# ora = cx_Oracle.connect ('scott/tiger@192.168.56.152:1521/orcl')
# using strings, passing in usernames, passwords, etc.
# ora = cx_Oracle.connect ('scott','tiger','192.168.56.152:1521/orcl')
# use dsn to parse into tns strings and connect to the database
Tnsname = cx_Oracle.makedsn ('192.168.56.152)
Ora = cx_Oracle.connect ('scott','tiger',tnsname)
# use sysdba or other role links
# ora = cx_Oracle.connect ('sys','oracle','192.168.56.152:1521/orcl',mode=cx_Oracle.SYSDBA)
Cursor = ora.cursor ()
Parameters used in cursor.execute ('insert into T1 values (50 DBA','CHINA' 1 jewel 2), (' DBA','CHINA')) # sql
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
# use tnsnames file alias links
# ora = cx_Oracle.connect ('scott/tiger@orcl')
# use a string and pass in a parameter link
# ora = cx_Oracle.connect ('scott/tiger@192.168.56.152:1521/orcl')
# using strings, passing in usernames, passwords, etc.
# ora = cx_Oracle.connect ('scott','tiger','192.168.56.152:1521/orcl')
# use dsn to parse into tns strings and connect to the database
Tnsname = cx_Oracle.makedsn ('192.168.56.152)
Ora = cx_Oracle.connect ('scott','tiger',tnsname)
# use sysdba or other role links
# 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}) # uses the prepare function, which allows you to pass parameters directly without passing in a sql statement in execute. Note: the first parameter here must be 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
# use tnsnames file alias links
# ora = cx_Oracle.connect ('scott/tiger@orcl')
# use a string and pass in a parameter link
# ora = cx_Oracle.connect ('scott/tiger@192.168.56.152:1521/orcl')
# using strings, passing in usernames, passwords, etc.
# ora = cx_Oracle.connect ('scott','tiger','192.168.56.152:1521/orcl')
# use dsn to parse into tns strings and connect to the database
Tnsname = cx_Oracle.makedsn ('192.168.56.152)
Ora = cx_Oracle.connect ('scott','tiger',tnsname)
# use sysdba or other role links
# ora = cx_Oracle.connect ('sys','oracle','192.168.56.152:1521/orcl',mode=cx_Oracle.SYSDBA)
Cursor = ora.cursor ()
# execute multiple statements
List1 = [(60, (60)), ((70)), (70), (), (70), (()), ()]
Cursor.prepare ('insert into T1 values (: 1 recorder 2 jewel 3)')
Cursor.executemany (None,list1) # uses the prepare function, which allows you to pass parameters directly without passing in a sql statement in execute. Note: the first parameter here must be None
Ora.commit ()
Cursor.execute ('select * from T1')
While 1:
Res = cursor.fetchone ()
If res = = None:
Break
Print (res)
Cursor.close ()
Ora.close ()
Call functions and stored procedures
# calling stored procedures
Cursor.callproc (name, parameters= [], keywordParameters= {})
# call function
Cursor.callfunc (name, returnType, parameters= [], keywordParameters= {})
# cx_Oracle.STRING
There is a conversion relationship between object types of cx_Oracle and Python.
Oraclecx_OraclePythonVARCHAR2, NVARCHAR2, LONGcx_Oracle.STRINGstrCHARcx_Oracle.FIXED_CHARstrNUMBERcx_Oracle.NUMBERintFLOATcx_Oracle.NUMBERfloatDATEcx_Oracle.DATETIMEdatetime.datetimeTIMESTAMPcx_Oracle.TIMESTAMPdatetime.datetimeCLOBcx_Oracle.CLOBcx_Oracle.LOBBLOBcx_Oracle.BLOBcx_Oracle.LOB
Get Chinese garbled code
Import os
Os.environ ['NLS_LANG'] =' SIMPLIFIED CHINESE_CHINA.UTF8'
# or os.environ ['NLS_LANG'] =' AMERICAN_AMERICA.AL32UTF8'
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