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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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